IEEE 802.16 WiMAX
Digital Standard for
R&S®Signal Generators
Operating Manual
(;ÕÂÛ<)
1171.5277.12 ─ 16
Operating Manual
Test & Measurement
This document describes the following software options:
●
R&S®SMBV-K49
1415.8119.xx
●
R&S®SMU-K49
1161.0366.02
●
R&S®AMU-K49
1402.7002.02
●
R&S®SMATE-K49
1404.6803.02
●
R&S®SMJ-K49
1404.1101.02
This manual version corresponds to firmware version:
FW 3.20.281.xx and later of the R&S®SMBV100A
FW 2.20.360.142 and later of the R&S®SMU200A, R&S®SMATE200A, R&S®SMJ100A and
R&S®AMU200A
© 2015 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: +49 89 41 29 - 0
Fax: +49 89 41 29 12 164
Email: info@rohde-schwarz.com
Internet: www.rohde-schwarz.com
Subject to change – Data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
WiMAX Forum® is a registered trademark of the WiMAX Forum. WiMAXTM, the WiMAX Forum logo, WiMAX Forum CertifiedTM and
the WiMAX Forum Certified logo are trademarks of the WiMAX Forum.
Trade names are trademarks of the owners.
The following abbreviations are used throughout this manual: R&S®SMBV100A is abbreviated as R&S SMBV, R&S®SMU200A is
abbreviated as R&S SMU, R&S®AMU200A is abbreviated as R&S AMU, R&S®SMATE200A is abbreviated as R&S SMATE,
R&S®SMJ100A is abbreviated as R&S SMJ, R&S®WinIQSIM2TM is abbreviated as R&S WinIQSIM2; the license types
02/03/07/11/13/16/12 are abbreviated as xx.
ContentsIEEE 802.16 WiMAX
Contents
1 Preface.................................................................................................... 7
1.1 Documentation Overview............................................................................................. 7
1.2 Conventions Used in the Documentation...................................................................8
1.2.1 Typographical Conventions.............................................................................................8
1.2.2 Notes on Screenshots.....................................................................................................9
1.2.3 Naming of Software Options........................................................................................... 9
2 Introduction.......................................................................................... 11
3 WiMAX User Interface..........................................................................15
3.1 General Settings for WiMAX Signals.........................................................................16
3.2 Frame Configuration OFDM....................................................................................... 24
3.2.1 Frame Configuration Common Settings........................................................................25
3.2.2 Burst Table....................................................................................................................28
3.2.3 Frame Burst Graph OFDM............................................................................................32
3.3 Active Carrier Graph OFDM....................................................................................... 32
3.4 FCH Configuration Downlink OFDM..........................................................................33
3.5 DL-MAP Configuration Downlink OFDM................................................................... 35
3.6 Generate UL-MAP Uplink OFDM................................................................................ 37
3.7 UL-MAP Configuration Downlink OFDM................................................................... 38
3.8 More Parameters Uplink OFDM................................................................................. 39
3.9 MAC Header Configuration OFDM.............................................................................39
3.10 Frame Configuration OFDMA.....................................................................................41
3.10.1 Frame Configuration Common Settings........................................................................41
3.10.2 Time Plan...................................................................................................................... 44
3.10.3 Zone Table.................................................................................................................... 45
3.11 Zone Configuration OFDMA.......................................................................................47
3.11.1 OFDMA Common Zone Settings.................................................................................. 47
3.11.2 Burst Table....................................................................................................................50
3.12 Sounding Zone Configuration OFDMA..................................................................... 55
3.12.1 OFDMA Sounding Zone Settings..................................................................................56
3.12.2 Sounding Table............................................................................................................. 58
3.13 CSTD OFDMA.............................................................................................................. 61
3Operating Manual 1171.5277.12 ─ 16
ContentsIEEE 802.16 WiMAX
3.14 FCH Configuration Downlink OFDMA....................................................................... 63
3.15 DL-MAP Configuration Downlink OFDMA.................................................................65
3.16 Data Configuration OFDMA........................................................................................69
3.16.1 OFDMA Data Configuration Settings............................................................................ 69
3.16.2 PDU Table.....................................................................................................................73
3.17 UL-MAP Configuration Downlink OFDMA.................................................................74
3.18 Generate UL-MAP Uplink OFDMA............................................................................. 78
3.19 Ranging Uplink OFDMA..............................................................................................80
3.20 HARQ Configuration OFDMA.....................................................................................81
3.20.1 OFDMA HARQ Settings................................................................................................82
3.20.2 HARQ Sub-burst Table................................................................................................. 84
3.21 Fast Feedback Configuration OFDMA...................................................................... 87
3.22 SUB-DL-UL-MAP Configuration OFDMA...................................................................89
3.23 MAC Header Configuration OFDMA.......................................................................... 90
3.24 PDU MAC Configuration OFDMA...............................................................................92
3.25 Filter / Clipping Settings.............................................................................................95
3.25.1 Filter Settings................................................................................................................ 95
3.25.2 Clipping Settings........................................................................................................... 98
3.25.3 Data Dump.................................................................................................................... 98
3.26 Trigger/Marker/Clock Settings................................................................................... 99
3.26.1 Trigger In.....................................................................................................................100
3.26.2 Marker Mode............................................................................................................... 104
3.26.3 Marker Delay...............................................................................................................105
3.26.4 Clock Settings............................................................................................................. 106
3.26.5 Global Settings............................................................................................................108
4 Remote-Control Commands............................................................. 109
4.1 General Commands.................................................................................................. 110
4.2 Filter/Clipping Settings.............................................................................................118
4.3 Trigger Settings.........................................................................................................124
4.4 Marker Settings......................................................................................................... 129
4.5 Clock Settings........................................................................................................... 132
4.6 OFDMA Physical Layer Settings..............................................................................135
4.7 OFDM Physical Layer Settings................................................................................ 197
4Operating Manual 1171.5277.12 ─ 16
ContentsIEEE 802.16 WiMAX
List of Commands..............................................................................217
Index....................................................................................................223
5Operating Manual 1171.5277.12 ─ 16
ContentsIEEE 802.16 WiMAX
6Operating Manual 1171.5277.12 ─ 16
1 Preface
PrefaceIEEE 802.16 WiMAX
Documentation Overview
1.1 Documentation Overview
The user documentation for the R&S Signal Generator consists of the following parts:
●
Online Help system on the instrument,
●
"Quick Start Guide" printed manual,
●
Documentation CD-ROM with:
– Online help system (*.chm) as a standalone help,
– Operating Manuals for base unit and options,
– Service Manual,
– Data sheet and specifications,
– Links to useful sites on the R&S internet.
Online Help
The Online Help is embedded in the instrument's firmware. It offers quick, context-sensitive access to the complete information needed for operation and programming. The
online help contains help on operating the R&S Signal Generator and all available
options.
Quick Start Guide
The Quick Start Guide is delivered with the instrument in printed form and in PDF format on the Documentation CD-ROM. It provides the information needed to set up and
start working with the instrument. Basic operations and an example of setup are described. The manual includes also general information, e.g., Safety Instructions.
Operating Manuals
The Operating Manuals are a supplement to the Quick Start Guide. Operating Manuals
are provided for the base unit and each additional (software) option.
These manuals are available in PDF format - in printable form - on the Documentation
CD-ROM delivered with the instrument. In the Operating Manual for the base unit, all
instrument functions are described in detail. Furthermore, it provides an introduction to
remote control and a complete description of the remote control commands with programming examples. Information on maintenance, instrument interfaces and error
messages is also given.
In the individual option manuals, the specific functions of the option are described in
detail. For additional information on default settings and parameters, refer to the data
sheets. Basic information on operating the R&S Signal Generator is not included in the
option manuals.
7Operating Manual 1171.5277.12 ─ 16
PrefaceIEEE 802.16 WiMAX
Conventions Used in the Documentation
Service Manual
The Service Manual is available in PDF format - in printable form - on the Documentation CD-ROM delivered with the instrument. It describes how to check compliance with
rated specifications, on instrument function, repair, troubleshooting and fault elimination. It contains all information required for repairing the instrument by the replacement
of modules.
This manual can also be orderd in printed form (see ordering information in the data
sheet).
Release Notes
The release notes describe new and modified functions, eliminated problems, and last
minute changes to the documentation. The corresponding firmware version is indicated
on the title page of the release notes. The current release notes are provided in the
Internet.
Web Help
The web help provides online access to the complete information on operating the
R&S Signal Generator and all available options, without downloading. The content of
the web help corresponds to the user manuals for the latest product version.
The web help is available on the R&S Signal Generator product page at the Downloads > Web Help area.
Application Notes
Application notes, application cards, white papers and educational notes are further
publications that provide more comprehensive descriptions and background information.
The latest versions are available for download from the Rohde & Schwarz website, at
http://www.rohde-schwarz.com/appnotes.
1.2 Conventions Used in the Documentation
1.2.1 Typographical Conventions
The following text markers are used throughout this documentation:
Convention Description
"Graphical user interface elements"
KEYS Key names are written in capital letters.
All names of graphical user interface elements on the screen, such as
dialog boxes, menus, options, buttons, and softkeys are enclosed by
quotation marks.
8Operating Manual 1171.5277.12 ─ 16
Convention Description
PrefaceIEEE 802.16 WiMAX
Conventions Used in the Documentation
File names, commands,
program code
Input Input to be entered by the user is displayed in italics.
Links Links that you can click are displayed in blue font.
"References" References to other parts of the documentation are enclosed by quota-
1.2.2 Notes on Screenshots
File names, commands, coding samples and screen output are distinguished by their font.
tion marks.
When describing the functions of the product, we use sample screenshots. These
screenshots are meant to illustrate as much as possible of the provided functions and
possible interdependencies between parameters. The shown values may not represent
realistic test situations.
The screenshots usually show a fully equipped product, that is: with all options installed. Thus, some functions shown in the screenshots may not be available in your particular product configuration.
1.2.3 Naming of Software Options
In this operating manual, we explicitly refer to options required for specific functions of
the digital standard.
The name of software options for signal generators vary in the name of the instrument,
but the option name is identical. Therefore we use in this manual the placeholder
R&S SMx/AMU.
Example:
Naming for an option of the vector signal generator R&S SMBV100A, e.g:
●
R&S SMx/AMU-K99, stands for R&S SMBV-K99
The particular software options available for the corresponding instruments are listed
on the back of the title page.
9Operating Manual 1171.5277.12 ─ 16
PrefaceIEEE 802.16 WiMAX
Conventions Used in the Documentation
10Operating Manual 1171.5277.12 ─ 16
IntroductionIEEE 802.16 WiMAX
2 Introduction
The R&S SMx/AMU-K49 provides you with the ability to generate signals in accordance with the Institute of Electrical and Electronics Engineers (IEEE 802.16-2004)
standard.
To playback a signal from a waveform file created by the simulation software
R&S WinIQSIM2, the corresponding R&S WinIQSIM2 digital standard option must be
installed.
WiMAX is a wireless metropolitan-area network technology that provides interoperable
broadband wireless connectivity to fixed and portable users. It provides up to 50 kilometers of service area, allows users to get broadband connectivity without the need of
direct line-of-sight to the base station, and provides total data rates up to 75 Mbps enough bandwidth to simultaneously support hundreds of businesses and homes with
a single base station.
The R&S Signal Generator generates the IEEE 802.16 WiMAX signals in the arbitrary
waveform mode; the signal is first calculated and then output.
The R&S Signal Generator simulates IEEE 802.16 WiMAX at the physical level.
Supported features include:
●
Configuration of OFDM (orthogonal frequency division multiplexing) and OFDMA
(orthogonal frequency division multiple access) physical layer mode.
●
Downlink and Uplink mode.
●
Pre-defined settings for receiver tests.
●
All frame duration settings defined by the standard, including a "user" mode with
freely configurable Frame Duration, and a "continuous" mode. In "continuous"
mode, gaps between bursts/subframes are eliminated.
●
Sequence length of up to 511 frames.
●
Up to 64 bursts per frame/zone with independent power setting.
●
Channel bandwidth and sampling rate settings according to the ETSI, MMDS,
WCS, U-NII or WiBro bands, or alternatively arbitrary settings in "User" mode.
●
Full RS/CC, CC and CTC channel coding.
●
BPSK, QPSK, 16-QAM or 64-QAM modulation, independently configurable for any
of the 64 bursts.
●
FCH, DL-MAP and UL-MAP burst generation in "automatic" mode (using signal
configuration parameters set by the user) or in "user" mode, with arbitrary data.
●
Ranging Bursts in uplink
●
Up to 8 Zones per frame in OFDMA mode
●
Predefined data sources such as PN9, PN11 and others, or arbitrary user data.
●
Optional generic MAC headers and CRC for each burst.
●
Subchannelization modes.
●
Clipping for reducing the crest factor.
11Operating Manual 1171.5277.12 ─ 16
IntroductionIEEE 802.16 WiMAX
Table 2-1: Parameters of the modulation system IEEE 802.16 WiMAX
Digital standard 802.16-2004 meets IEEE Std 802.16™-2004/Cor2/D4 and
802.16e-2005
Physical layer modes OFDM, OFDMA, OFDMA – WiBro
Link direction forward link and reverse link
Frame durations 2, 2.5, 4, 5, 8, 10, 12.5, 20 ms, continuous, user
definable
Sequence length 1 – 511 frames (depending on frame duration)
Clipping Vector or scalar clipping, applied before filtering
Marker modes Restart, frame start, frame active part, pulse, pat-
tern, on/off ratio
Parameters in OFDM Mode
Duplexing TDD, FDD
Predefined frames Short, mid and long length test messages for testing
Level reference FCH/Burst or preamble level
Frequency bands ETSI, MMDS, WCS, U-NII, User
Channel bandwidth 1.25 – 30 MHz, depending on selected frequency
Sampling rate 1.5 – 32 MHz, depending on channel bandwidth
Tg / Tb settings 1/4, 1/8, 1/16, 1/32
FFT size 256 (fixed)
Nr. Of possible subchannels in subchannelization
mode
Nr. Of bursts per frame 0 – 64
Preamble / midamble modes Burst preamble / midambles off, burst preamble in
Modulation & RS-CC rates BPSK ½, QPSK ½, QPSK ¾, 16-QAM ½, 16-QAM
receivers with all modulation types and RS-CC rates
band
1, 2, 4, 8, 16 (all)
downlink, midamble repetition 5, 9 or 17 in uplink
¾, 64-QAM 2/3, 64-QAM ¾
Data all 0 , all 1, pattern (up to 64 bit), PN 9 to PN 23,
data lists
Burst power range -80 dB - +10 dB
MAC functions One generic MAC header + CRC available per burst
Parameters in OFDMA Mode
Duplexing TDD
Level reference Subframe RMS Power or preamble level (downlink
Frequency bands ETSI, MMDS, WCS, U-NII, WiBro, User
Channel bandwidth 1.25 – 30 MHz, depending on selected frequency
only)
band
12Operating Manual 1171.5277.12 ─ 16
IntroductionIEEE 802.16 WiMAX
Digital standard 802.16-2004 meets IEEE Std 802.16™-2004/Cor2/D4 and
802.16e-2005
Sampling rate 1.5 – 32 MHz, depending on channel bandwidth
Tg / Tb settings ¼, 1/8, 1/16, 1/32
FFT size 128, 512, 1024 or 2048
Subcarrier Permutation PUSC, FUSC (downlink only), AMC 2x3, Sounding
(uplink only)
Nr. Of bursts per frame 0 – 64
Modulation & CC rates QPSK ½, QPSK ¾, 16-QAM ½, 16-QAM ¾, 64-
QAM ½, 64-QAM 2/3, 64-QAM ¾, 64-QAM 5/6
Data all 0 , all 1, pattern (up to 64 bit), PN 9 to PN 23,
data lists
Burst power range -80 dB - +10 dB
MAC functions One generic MAC header + CRC available per burst
Parameters in OFDMA - WiBro Mode
(identical to OFDMA)
Duplexing TDD
Level reference Subframe RMS Power or preamble level (downlink
Frequency bands ETSI, MMDS, WCS, U-NII, WiBro, User
Channel bandwidth 1.25 – 30 MHz, depending on selected frequency
Sampling rate 1.5 – 32 MHz, depending on channel bandwidth
Tg / Tb settings ¼, 1/8, 1/16, 1/32
FFT size 128, 512, 1024 or 2048
Subcarrier Permutation PUSC, FUSC (downlink only), AMC 2x3, Sounding
Nr. Of bursts per frame 0 – 64
Modulation & CC rates QPSK ½, QPSK ¾, 16-QAM ½, 16-QAM ¾, 64-
Data all 0 , all 1, pattern (up to 64 bit), PN 9 to PN 23,
Burst power range -80 dB - +10 dB
only)
band
(uplink only)
QAM ½, 64-QAM 2/3, 64-QAM ¾, 64-QAM 5/6
data lists
MAC functions One generic MAC header + CRC available per burst
13Operating Manual 1171.5277.12 ─ 16
IntroductionIEEE 802.16 WiMAX
14Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
3 WiMAX User Interface
The dialog for setting the IEEE 802.16 WiMAX digital standard is either called from the
baseband block or from the dialog tree under "Baseband".
The dialog is split into several sections for configuring the standard. The choice of
transmission direction determines which displays and parameters are made available
in the lower section.
The upper section of the dialog is where the IEEE 802.16 WiMAX digital standard is
enabled, the default settings are called and the physical layer mode, the duplexing and
the transmission direction are selected. Additional parameters include Frame Duration,
Sequence Length and a set of Predefined Frames for receiver testing.
A button leads to the subdialog for loading and saving the IEEE 802.16 WiMAX configuration.
The buttons of the lower dialog section lead to subdialogs for configuring the frame and
for setting the filter, clipping, trigger, and clock parameters.
15Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
General Settings for WiMAX Signals
3.1 General Settings for WiMAX Signals
This dialog provides access to the default and the "Save/Recall" settings, and displays
the valid WiMaX version and the physical layer mode. The choice of link direction and
duplexing determines which parameters are available.
State
Activates the standard and deactivates all the other digital standards and digital modulation modes in the same path.
Note: For two path instruments and enabled parameter Use of Baseband A+B, enabling the WiMAX signal simulation will disable all other digital standards and digital
modulation modes even in the path B.
Remote command:
[:SOURce<hw>]:BB:WIMax:STATe on page 116
Set to Default
Calls the default settings. The values of the main parameters are listed in the following
table.
Parameter Value
General Settings
State Not affected by "Set to default"
Physical Layer Mode OFDM
Version 802.16-2004/Cor1-2005 and 802.16e-2005
Duplexing TDD
Link Direction Downlink
Frame Duration 10 ms
Sequence Length 1 frame
Predefined Frames User
Level Reference FCH/Burst
Clipping Off
OFDM mode
Frequency Band ETSI
Channel Bandwidth 1.75 MHz
Sampling Rate 2.00 MHz
BSID (4 LSBs) 0
Tg/Tb 1/4
Nr. of used Subchannels 16 (all)
Frame Preamble Long
16Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
General Settings for WiMAX Signals
Parameter Value
FCH Configuration On, Auto mode, Frame Number Offset = 0 and Con-
figuration Change Count = 0
Nr. of Bursts 1
OFDMA mode
Frequency Band ETSI
Channel Bandwidth 1.75 MHz
Sampling Rate 2.00 MHz
n = 8/7
Tg/Tb 1/4
FFT Size 2048
Subcarrier Permutation PUSC
Subchannel 0 ... 59 State ON
OFDMA - WiBro mode
Frequency Band WiBro
Channel Bandwidth 8.75 MHz
Sampling Rate 10 MHz
n = 8/7
Tg/Tb 1/8
FFT Size 1024
Subcarrier Permutation PUSC
Subchannel 0 … 59 State ON
Frame Duration 5 ms
Remote command:
[:SOURce<hw>]:BB:WIMax:PRESet on page 114
Save/Recall
Calls the "Save/Recall" dialog.
From the "Save/Recall" dialog, the "File Select" windows for saving and recalling IEEE
802.16 WiMAX configurations and the "File Manager" can be called.
IEEE 802.16 WiMAX configurations are stored as files with the predefined file extension *.wimax. The file name and the directory they are stored in are user-definable.
The complete settings in the "IEEE 802.16 WiMAX" dialog are saved and recalled.
17Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
General Settings for WiMAX Signals
"Recall WiMAX
Setting"
"Save WiMAX
Setting"
"File Manager"
Remote command:
[:SOURce<hw>]:BB:WIMax:SETTing:CATalog? on page 114
[:SOURce<hw>]:BB:WIMax:SETTing:LOAD on page 115
[:SOURce<hw>]:BB:WIMax:SETTing:STORe on page 115
[:SOURce<hw>]:BB:WIMax:SETTing:DELete on page 115
Data List Management…
Calls the "Data List Management" dialog. This dialog is used to create and edit a data
list.
Opens the "File Select" window for loading a saved IEEE 802.16
WiMAX configuration.
The configuration of the selected (highlighted) file is loaded by pressing the "Select" button.
Opens the "File Select" window for saving the current IEEE 802.16
WiMAX signal configuration.
The name of the file is specified in the "File name" entry field, the
directory selected in the "save into" field. The file is saved by pressing
the "Save" button.
Calls the "File Manager".
The "File Manager" is used to copy, delete, and rename files and to
create new directories.
All data lists are stored as files with the predefined file extension *.dm_iqd. The file
name and the directory they are stored in are user-definable.
The data lists must be selected as a data source from the subdialogs under the individual function, e.g. in the channel table of the cells.
Note: All data lists are generated and edited by means of the SOURce:BB:DM subsystem commands. Files containing data lists usually end with *.dm_iqd. The data lists are
selected as a data source for a specific function in the individual subsystems of the digital standard.
18Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
General Settings for WiMAX Signals
Example: Creating and editing the data list
SOUR:BB:DM:DLIS:SEL "d_list1"
SOUR:BB:DM:DLIS:DATA #B1111010101000001111....
SOUR:BB:DM:DLIS:DATA:APP #B1111010101000001111....
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DATA
on page 160
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DATA:DSELect
on page 160
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DATA on page 199
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DATA:DSELect on page 199
[:SOURce<hw>]:BB:WIMax:OFDM:FCH:DATA on page 208
[:SOURce<hw>]:BB:WIMax:OFDM:FCH:DATA:DSELect on page 209
Generate Waveform File…
Calls the "Generate Waveform" dialog. This dialog is used to store the current WiMAX
signal as ARB signal in a waveform file.
This file can be loaded in the "ARB" dialog and processed as multicarrier or multisegment signal.
The file name is entered in the subdialog. The file is stored with the predefined file
extension *.wv. The file name and the directory it is stored in are user-definable.
Remote command:
[:SOURce<hw>]:BB:WIMax:WAVeform:CREate on page 117
Physical Layer Mode
Selects the physical layer mode.
The settings of the frame are provided in the subdialog "Frame Configuration" (see
Frame Configuration OFDM) in accordance with the selection.
"OFDM"
"OFDMA"
The OFDM mode supports signal generation according to IEEE
802.16-2004 section 8.3 with a fixed FFT size of 256.
Orthogonal Frequency Division Multiple Access (OFDMA) groups
multiple subcarriers of the OFDM into sub-channels. A single client or
subscriber station might transmit using all of the sub-channels within
the carrier space, or multiple clients might transmit with each using a
portion of the total number of sub-channels simultaneously. OFDMA
thus enables a more flexible use of resources. It can support nomadic
and mobile operation.
19Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
General Settings for WiMAX Signals
"OFDMA WiBro"
Remote command:
[:SOURce<hw>]:BB:WIMax:MODE on page 112
Version
Selects the version of the standard to use.
"802.16
Rev2/D3"
"802.16-2004/
Cor1-2005 and
802.16e-2005"
Remote command:
[:SOURce<hw>][:BB]:WIMax:SVERsion on page 117
The OFDMA – WiBro (Wireless Broadband) mode groups multiple
subcarriers of the OFDM into sub-channels. A single client or subscriber station might transmit using all of the sub-channels within the
carrier space, or multiple clients might transmit with each using a portion of the total number of sub-channels simultaneously. OFDMA thus
enables a more flexible use of resources. It can support nomadic and
mobile operation.
The OFDMA – WiBro mode is identical to the OFDMA mode. When
selecting OFDMA – WiBro, these parameters are set to their WiBro
defaults (see Set to Default):
●
Frame Duration: 5ms
●
Frequency Band: WiBro
●
Channel Bandwidth: 8.75 MHz
●
Sampling Rate: 10 MHz
●
Tg/Tb: 1/8
●
FFT Size: 1024
Selecting "802.16 Rev2/D3" ensures that all signal parameters are in
line with the latest Revision 2 version of the standard.
Using this mode is recommended.
Selecting 802.16-2004/Cor1-2005 and 802.16e-2005 provides backward compatibility for devices that do not yet comply with the latest
Release 2 version.
Duplexing
Selects the duplexing. The duplexing mode determines how the uplink and downlink
signals are separated.
"TDD"
"FDD (OFDM
only)"
Remote command:
[:SOURce<hw>]:BB:WIMax:DUPLexing on page 111
In TDD mode, the same frequency is used for both directions of
transmission (uplink and downlink). With one baseband, either downlink or uplink frames can be generated.
In FDD mode, different frequencies are used for downlink and uplink
directions. If only one link direction is considered at once, the IEEE
802.16 standard defines no differences between TDD and FDD signals on the physical layer.
The FDD mode has been provided for convenience, it completely fills
the defined frame with bursts to simulate a continuous transmission
environment. It is recommended to use TDD mode instead if FDD
devices are to be tested with frames including transmission gaps.
20Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
General Settings for WiMAX Signals
Link Direction
Selects the transmission direction.
"Downlink"
"Uplink"
Remote command:
[:SOURce<hw>]:BB:WIMax:LINK on page 112
Frame Duration
Selects the frame duration.
Only distinct values are allowed in the standard. For test reasons, continuous generation or generation for a freely selectable duration (User) are available. In continuous
mode, the frame duration equals the sum of the burst durations in OFDM mode or the
subframe duration in OFDMA mode.
Remote command:
[:SOURce<hw>]:BB:WIMax:FRAMe:TIME on page 112
The transmission direction selected is base station to subscriber station. The signal corresponds to that of a base station.
The transmission direction selected is subscriber station to base station. The signal corresponds to that of a subscriber station.
User Frame Duration
(available for Frame Duration set to User)
Sets the frame duration for selection User. The values are freely selectable.
Remote command:
[:SOURce<hw>]:BB:WIMax:FRAMe:TIME:USER on page 112
Downlink Subframe Duration
(available for uplink direction in TDD mode)
Delays the first uplink burst by the set time duration.
Remote command:
[:SOURce<hw>]:BB:WIMax:SUBFrame:TIME on page 117
Initial Delay of Burst 1
(available for the uplink direction in FDD mode with physical layer mode OFDM)
Delays the first uplink burst by the set time duration.
In FDD mode, this parameter is provided for convenience to enable a constant delay of
the signal with respect to an internal or external frame trigger.
Remote command:
[:SOURce<hw>]:BB:WIMax:FRAMe:BURSt:DELay on page 111
Sequence Length
Sets the sequence length of the signal in number of frames. The signal is calculated in
advance and output in the arbitrary waveform generator. Burst data sources are continuously read over the whole sequence length.
Remote command:
[:SOURce<hw>]:BB:WIMax:SLENgth on page 116
21Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
General Settings for WiMAX Signals
Predefined Frames
Selects the frame type.
"Test Message BPSK 1/2 Short, Test Message BPSK 1/2 Mid,…(OFDM only)"
Predefined setups for receiver test messages according to IEEE
802.16-2004 section 8.3.11
"Downlink/Uplink 35MHz QPSK 1/2, Downlink/Uplink 35MHz QPSK 3/4,…(OFDMA/
OFDMA-WiBro only)"
Predefined setups for receiver test messages. The available predefined frames depend on the selected link direction.
"User"
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:FRAMe:PREDefined on page 211
[:SOURce<hw>]:BB:WIMax:AOFDm:FRAMe:PREDefined on page 140
Level Reference
Selects the level reference.
"FCH / Burst (OFDM only)"
"Preamble (OFDM uplink and downlink OFDMA/OFDMA - WiBro downlink only)"
"Subframe RMS Power (OFDMA/OFDMA - WiBro only)"
"Subframe RMS Power w/o Preamble (OFDMA/OFDMA - WiBro only)"
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:POWer:REFerence on page 212
[:SOURce<hw>]:BB:WIMax:AOFDm:POWer:REFerence on page 142
The settings for the frame can be defined by the user.
The instrument's level setting refers to the mean power of FCH
(Frame Control Header) or bursts with a burst power setting of 0 dB.
To obtain the absolute burst power value, the burst power value has
to be added to the level value.
The instrument's level setting refers to the preamble, which is
FCH / Burst power + 3dB in OFDM mode.
The instrument's level setting refers to the rms power of the subframe. This includes the preamble and all symbols with allocated carriers in downlink or the whole uplink subframe in uplink.
The instrument's level setting refers to the rms power of the subframe, excluding the preamble. This includes all symbols with allocated carriers in downlink or the whole uplink subframe in uplink.
Use Baseband A+B
(Available only in path A of two-path instruments and for OFDMA and OFDMA-WIBro
Physical Layer Mode)
Enables/disables control of both paths via the WiMAX dialog.
Note: For two path instruments and enabled parameter Use of Baseband A+B, enabling the WiMAX signal simulation disables all other digital standards and digital modulation modes in path B.
22Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
General Settings for WiMAX Signals
An active Baseband A+B mode is useful for STC (MIMO) signal setups. In this case,
baseband B is controlled from baseband A and generates an identical setup, just with
opposite STC antenna configuration. Triggering is performed automatically such that
both basebands are aligned in time.
Example:
1. Configure baseband A to generate one SISO zone (set the parameter "Space-Time
Coding Mode" to off for this zone)
2. Configure one additional STC zone with antenna 0 (parameter "Space-Time Coding
Antenna" set to Antenna 0).
3. Enable parameter "Use Baseband A+B".
4. Switch on baseband A .
4.1 Baseband B is automatically activated.
4.2 Baseband A generates preamble, SISO zone and STC zone with antenna 0.
4.3 Baseband B omits preamble and SISO zone and generates the STC zone with
antenna 1.
For STC modes with 4 antennas, using antenna 0 in baseband A generates antenna 1
in baseband B. Using antenna 2 in baseband A generates antenna 3 in baseband B. A
two-path instrument can either provide antennas 0 & 1 or antennas 2 & 3.
Remote command:
[:SOURce<hw>]:BB:WIMax:PATH:COUPling[:STATe] on page 113
Power Of Baseband B Relative to A
(Available only in path A of two-path instruments and enabled parameter Use Baseband A+B)
This parameter sets the relative power offset of path B compared to the power level of
the path A.
A value of 0 dB refers to the level set in the main RF level setting of the instrument.
Negative values lower the level of baseband B, i.e. the level of Baseband A matches
the main level setting, Baseband B is offset by the set amount. The level display of
path B is however not changed.
Positive values lower the level of baseband A, i.e. the level of Baseband B matches the
main level setting, Baseband A is offset by the set amount. The level display of path A
is however not changed.
Remote command:
[:SOURce<hw>]:BB:WIMax:PATH:COUPling[:STATe] on page 113
[:SOURce<hw>]:BB:WIMax:PATH:COUPling:POFFset on page 113
Frame Configuration
Accesses the dialog for configuration of the frame.
23Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDM
The dialog depends on the selected physical layer mode, see chapter 3.2, "Frame
Configuration OFDM", on page 24 and chapter 3.10, "Frame Configuration OFDMA",
on page 41.
Remote command:
n.a.
Filter / Clipping
Calls the dialog for setting clipping and the sample rate variation of the arbitrary waveform. The current setting is displayed next to the button.
The dialog is described in chapter 3.25, "Filter / Clipping Settings", on page 95
Remote command:
n.a.
Trigger/Marker
(R&S SMx and R&S AMU instruments only)
Calls the dialog for selecting the trigger source, for configuring the marker signals and
for setting the time delay of an external trigger signal (see chapter 3.26, "Trigger/
Marker/Clock Settings", on page 99).
The currently selected trigger source is displayed to the right of the button.
Remote command:
n.a.
Execute Trigger
Executes trigger manually.
A manual trigger can be executed only when an internal trigger source and a trigger
mode other than "Auto" have been selected.
Remote command:
[:SOURce<hw>]:BB:WIMax:TRIGger:EXECute on page 124
Clock
(R&S SMx and R&S AMU instruments only)
Calls the dialog for selecting the clock source and for setting a delay (see chap-
ter 3.26.4, "Clock Settings", on page 106).
Remote command:
n.a.
3.2 Frame Configuration OFDM
This dialog provides all parameters to configure frames in OFDM mode. The selected
link direction determines the availale parameters.
The dialog shows the parameters and graph for downlink direction.
24Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDM
3.2.1 Frame Configuration Common Settings
Provided are the following settings:
Frequency Band OFDM
Selects the frequency band for the carrier frequencies. The available ranges for setting
the channel bandwidth and the sampling rate depend on the selection here.
"ETSI"
The frequency band as defined Norm by the European Telecommunications Standards Institute applies.
The range is 1.75 to 28 MHz for the channel bandwidth and 2 to 32
MHz for the sampling rate.
"MMDS"
The frequency band as defined by the"Multichannel Multipoint Distribution Service" applies. The RF frequency range is 2500 to 2686
MHz.
The range is 1.50 to 24 MHz for the channel bandwidth and 1.72 to
27.52 MHz for the sampling rate.
"WCS"
The frequency band as defined by the "Wireless Communication Service" applies. It is in the 2.3 GHz band of the electromagnetic spectrum from 2305 to 2320 MHz and 2345 to 2360 MHz.
The range is 2.5 to 15 MHz for the channel bandwidth and 2.88 to
17.28 MHz for the sampling rate.
25Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDM
"U-NII"
"User"
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:FBANd on page 208
Channel Bandwidth OFDM
Sets the channel bandwidth. The range is 1.25 to 28 MHz.
The selected channel bandwidth has to be a multiple of 1.25, 1.5, 1.75, 2.0 or 2.75
MHz. The channel bandwidth determines the parameter n (see Sampling Ratio n
OFDM):
●
For channel bandwidths
– that are a multiple of 1.75 MHz then n = 8/7
– that are a multiple of 1.5 MHz then n = 86/75
– that are a multiple of 1.25 MHz then n = 144/125
– that are a multiple of 2.75 MHz then n = 316/275
– that are a multiple of 2.0 MHz then n = 57/50
●
else for channel bandwidths not otherwise specified then n = 8/7
The sampling rate is derived from the channel bandwidth as follows:
SamplingRate = floor(n * ChannelBandwidth / 8000) * 8000
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BW on page 207
The frequency band as defined by the "Unlicensed National Information Infrastructure" applies. It is in the 5 GHz band of the electromagnetic spectrum from 5150 to 5350 GHz and 5750 to 5825 GHz.
The range is 10 to 20 MHz for the channel bandwidth and 11.52 to
23.04 MHz for the sampling rate.
This mode is provided for choosing any other channel bandwidth /
sampling rate combination.
The range is 1.25 to 28 MHz for the channel bandwidth and 1.44 to
32 MHz for the sampling rate.
Sampling Ratio n OFDM
Indicates the sampling ratio. The sampling ratio is determined by the channel bandwidth (see Channel Bandwidth OFDM).
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:N? on page 212
Sampling Rate OFDM
Sets the sampling rate. The possible settings depend on the selected frequency band.
The full range in "User" mode is 1.44 to 32 MHz.
The sampling rate is related to the channel bandwidth by the parameter n:
SamplingRate = floor(n * ChannelBandwidth / 8000) * 8000
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:SRATe on page 213
BSID OFDM
Sets the 4 LSBs of the Base Station ID.
26Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDM
The BSID is transmitted in the FCH (when set to "Auto" mode), and it is used to initialize the randomizer.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BSID on page 198
No. of Bursts OFDM
Sets the number of active bursts in one frame.
With number of bursts = 0, a preamble only or a preamble with an FCH burst is generated.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt[:COUNt] on page 207
Tg/Tb Ratio OFDM
Selects the ratio of guard period to symbol period.
This value sets the length of the cyclic prefix in fractions of the symbol period.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:TGTB on page 215
No. of Used Subchannels OFDM
Selects the number of used subchannels.
Selection 16 (all) deactivates subchannelization and activates all possible carriers. The
values 1, 2, 4 and 8 activate only a part of the available subcarriers, unused carriers
are blanked.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:SUBChannel[:COUNt] on page 214
Subchannel Index OFDM
Selects the subchannel index in subchannelization mode.
The subchannel index determines the set of used subcarriers according to table 213 of
IEEE 802.16-2004 standard.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:SUBChannel:INDex on page 214
Frame Preamble OFDM
Activates the generation of a frame preamble. Either a long preamble or a short preamble can be activated.
The 802.16 standard requires a long preamble as frame start.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:PREamble:MODE on page 213
Frame Number OFDM
Selects the frame number of the uplink frame in which the UL map that specifies the
uplink burst was transmitted.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:FRAMe[:NUMBer] on page 212
27Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDM
Configure FCH OFDM
Accesses the dialog for configuring FCH mode and parameters (see chapter 3.4, "FCH
Configuration Downlink OFDM", on page 33).
Remote command:
n.a.
Generate UL-MAP...
Accesses the dialog for generating the UL-Map, see chapter 3.7, "UL-MAP Configura-
tion Downlink OFDM", on page 38.
Remote command:
n.a.
3.2.2 Burst Table
The "burst table" is located in the lower part of the dialog. The burst table is where the
individual burst parameters are set. A graphic display below the table shows length,
position and power of all configured bursts within the frame
Up to 64 bursts can be configured per frame. Each table row defines the settings of
one specific burst, where the first row defines the first burst of the frame and the last
row defines the last burst.
For both transmission directions, different modulations and channel coding rates are
available for each burst. A generic MAC header with encrypted payload and checksum
determination can be activated.
Some setting parameters vary depending on the transmission direction.
The graph below shows the table in uplink direction.
28Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDM
Burst Index OFDM
Displays the consecutive burst index from 0 to 63.
All the rows are always displayed, even if the bursts are inactive. They are switched on
and off by the selection of "No. of Bursts" above the table. The active bursts are highlighted.
Remote command:
n.a.
(selected via the suffix to the keyword BURSt<n>)
Preamble OFDM
Enables generation of the burst preamble.
If activated, a preamble is placed before the burst. Long or short preambles are available. The preamble has the same power as the burst. If subchannelization is used, a
subchannelization preamble is generated accordingly.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:PREamble:MODE on page 205
Midamble Repetition OFDM
Activates midamble repetition.
If midamble repetition is switched on, midambles are placed into the burst with the
specified interval, i.e. if 5 is selected, every 5th symbol of the burst is a midamble.
A short preamble is used as midamble when subchannelization is off or a subchannelization preamble is used in subchannelization mode. The power of the midambles is
identical to the burst power.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:MIDamble on page 204
Modulation and RS-CC Rate OFDM
Selects the modulation and channel coding rate. Channel coding includes randomization, reed solomon coding, convolutional coding and interleaving.
For a given modulation type and channel coding rate, the data length determines the
number of symbols and vice versa.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:FORMat on page 202
Channel Coding OFDM
Switches channel coding on or off.
If channel coding is switched off, the bits read from the data source are directly modulated onto the carriers. Due to randomization missing, this could result in very high
crest factors of the signal.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:CCODing:STATe on page 199
Data Length OFDM
Determines the data length in bytes.
29Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDM
The given number of bytes is read from the data source. The total number of data
bytes in the burst (before channel coding) is determined as follows:
TotalDataBytes = DataLength + MACHeaderBytes + CRCBytes + TailByte
The tail byte is only added when channel coding is switched on. The same is the case
for the MAC header and CRC, they are not added when switched off. Additionally padding with 0xFF bytes is applied at the end of the data sequence to reach an integer
number of OFDM symbols.
The data length determines the number of symbols and vice versa. The maximum data
length of 10000 bytes defines the maximum number of symbols for a given modulation
type and channel coding rate.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DLENgth on page 200
Number of Symbols OFDM
Enters the number of symbols for the selected burst. If the number of symbols is
changed, the data length is adjusted to fill the specified number of symbols with data
so that no padding has to be applied.
The maximum data length of 10 000 bytes defines the maximum number of symbols
for a given modulation type and channel coding rate.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:SYMBol[:COUNt] on page 206
Data Source OFDM
Selects data source for the selected bursts.
The following standard data sources are available:
●
"All 0, All 1"
An internally generated sequence containing 0 data or 1 data.
●
"PNxx"
An internally generated pseudo-random noise sequence.
●
"Pattern"
An internally generated sequence according to a bit pattern.
Use the "Pattern" box to define the bit pattern.
●
"Data List/Select DList"
A binary data from a data list, internally or externally generated.
Select "Select DList" to access the standard "Select List" dialog.
– Select the "Select Data List > navigate to the list file *.dm_iqd > Select" to
select an existing data list.
– Use the "New" and "Edit" functions to create internally new data list or to edit
an existing one.
– Use the standard "File Manager" function to transfer external data lists to the
instrument.
See also "Main Dialog > Data List Management".
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DATA on page 199
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DATA:PATTern on page 200
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DATA:DSELect on page 199
30Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDM
DIUC OFDM
Sets the specific interval usage code.
The code is used to initialize the randomizer.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DIUC on page 200
Boost OFDM
Sets the burst power in dB.
To set the absolute power of a burst correctly, level reference "FCH / Burst" must be
selected. In this mode, the output power of a burst equals Level + BurstPower.
In downlink, the preamble is transmitted with +3 dB and the FCH is transmitted with 0
dB.
In uplink, the power of the first burst is fixed to 0 dB.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:POWer on page 205
MAC Header OFDM
Calls the dialog for configuring the generic MAC (Media Access Control) header of the
selected burst and for activating the checksum determination.
Remote command:
n.a.
Burst Type OFDM
Select the burst type from Data, DL-MAP, UL-MAP or Ranging.
"DATA"
"DL-MAP"
"UL-MAP"
Regular bursts are called "Data" bursts. All data sources are available
for this type of burst.
A DL-MAP is generated, taking into account all active bursts.
The DL-MAP fields are filled with the following parameters:
●
DCD COUNT
●
Set to "Configuration Change Count" from the FCH panel
●
"Base Station ID"
Set to BSID from the Frame Configuration panel
●
"CID"
Set to CID from the MAC header panel for each burst
●
"DIUC"
Set to DIUC from the burst table for each burst
●
"Preamble present"
Set to 1 if a burst preamble is present
●
"Start Time"
Set to burst start time in OFDM symbols, relative to frame start
A UL-MAP is generated using the specified data list, including additional parameters from the "More Param" panel. SeeGenerate UL-
MAP... for more information on how to create UL-MAP bursts.
31Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Active Carrier Graph OFDM
"Ranging"
An uplink ranging burst is composed of a long preamble following two
subchannelized preambles using one active subchannel. The subchannel index for the two preambles is read from the configured data
source. For each frame 4 bits are read from the data source (called
"data"), which define the subchannel index as follows:
Index = data * 2 + 1
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:TYPE on page 206
More Parameter OFDM – WiMAX
Accesses the dialog for configuring additional parameters for the bursts, see chap-
ter 3.8, "More Parameters Uplink OFDM", on page 39.
Remote command:
n.a.
Gap OFDM
Sets the length of the gap between the selected burst and the next burst in µs. The
setting is only available for transmission direction uplink.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:GAP on page 202
3.2.3 Frame Burst Graph OFDM
The frame graph indicates the configuration of one frame. The scaling of the X-axis is
always adapted to the set frame duration. The preamble length, FCH length and the
burst length are drawn to scale. The height of the bar represents the relative power.
The power of the preamble is always +3 dB and of the FCH always 0 dB relative to the
power of the other bursts.
The shown frame configuration is repeated over the whole sequence length.
●
In downlink direction the frame preamble is sent at the beginning of the frame.
●
In uplink direction each burst starts with a preamble. The first gap at the beginning
of the frame is determined by the Downlink Subframe Duration (specified in the
main dialog), the following gaps are defined by the gap value specified for the
associated burst in the burst table.
3.3 Active Carrier Graph OFDM
The Active Carrier graph is reached via the "Show Active Carrier" button at the Bottom
of the "Frame Configuration" subdialog.
32Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
FCH Configuration Downlink OFDM
The graph shows used pilots and carriers of the current subchannelization mode.
When subchannelization is activated by setting "No. of used Subchannels" to a value
different than 16, the graph shows the used and blanked carriers according to the setting of "Subchannel Index".
3.4 FCH Configuration Downlink OFDM
The "FCH Configuration" dialog is reached via the "Configure FCH" button in the frame
configuration dialog. The FCH is only available in downlink mode. The following
describes the FCH options in OFDM mode.
Provided are the following settings:
FCH State OFDM
Activates the FCH.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:FCH:STATe on page 211
33Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
FCH Configuration Downlink OFDM
FCH Mode OFDM
Selects the mode for generating the FCH.
Channel Coding of the FCH is performed both in "Auto" and "User" mode.
"Auto"
"User"
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:FCH:MODE on page 210
In "Auto" mode, the DLFP (Downlink Frame Prefix) fields, which form
the FCH, are filled automatically with parameters specified at different
locations.
The following list shows the mapping that applies in Auto mode:
●
Base_Station_ID
Set to the BSID value specified in the frame configuration dialog
●
Frame_Number
Set to the current frame number modulo 16. The first frame of the
generated sequence has the number specified in Frame Number
Offset below. For the following frames, this number will increase
by 1 per frame
●
Configuration_Change_Count
Set to the value specified below
●
Rate_ID
The Rate ID parameter of the first burst is set according to its
modulation setting
●
DIUC
The DIUC value for the second, third and fourth burst is taken
from the DIUC value in the burst table
●
Preamble Present
Set to 1 when the burst preamble is activated for the corresponding burst
●
Length
Set to the calculated number of symbols of the corresponding
burst
●
HCS
The Header Check Sequence is automatically calculated
In "User" mode, the FCH is filled with data specified under Data
Source. This enables any arbitrary data to be sent with the FCH
burst.
Frame Number Offset FCH OFDM
Sets the frame number offset.
This value is added to the current frame number of the sequence. After modulo 16 division, the result is used as Frame_Number in the FCH (in Auto mode) and is also used
to initialize the randomizers.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:FCH:FNOFfset on page 210
Configuration Change Count FCH OFDM
Sets the configuration change count value.
34Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
DL-MAP Configuration Downlink OFDM
This value is used for the corresponding FCH field in Auto mode.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:FCH:CCC on page 208
Data Source FCH OFDM
Specifies the data source in User mode.
The FCH contents are filled from the selected data source.
The following standard data sources are available:
●
"All 0, All 1"
An internally generated sequence containing 0 data or 1 data.
●
"PNxx"
An internally generated pseudo-random noise sequence.
●
"Pattern"
An internally generated sequence according to a bit pattern.
Use the "Pattern" box to define the bit pattern.
●
"Data List/Select DList"
A binary data from a data list, internally or externally generated.
Select "Select DList" to access the standard "Select List" dialog.
– Select the "Select Data List > navigate to the list file *.dm_iqd > Select" to
select an existing data list.
– Use the "New" and "Edit" functions to create internally new data list or to edit
an existing one.
– Use the standard "File Manager" function to transfer external data lists to the
instrument.
See also "Main Dialog > Data List Management".
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:FCH:DATA on page 208
[:SOURce<hw>]:BB:WIMax:OFDM:FCH:DATA:PATTern on page 210
[:SOURce<hw>]:BB:WIMax:OFDM:FCH:DATA:DSELect on page 209
3.5 DL-MAP Configuration Downlink OFDM
The "DL-MAP Configuration" dialog is accessed via the "More Params" button in the
OFDM burst table for burst type DL-MAP. The DL-MAP is only available in OFDM
downlink mode.
35Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
DL-MAP Configuration Downlink OFDM
Provided are the following settings:
Append DCD OFDM
If activated, a DCD is appended to the DL-MAP. The DCD message carries its own
MAC header and CRC, but is included within the DL-MAP burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DLMap:DCD:STATe on page 201
Append UL-Map OFDM
If activated, a UL-Map is appended to the DL-Map.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DLMap:ULM:STATe on page 202
Allocation Start Time Base OFDM
Selects the Allocation Start Time base, required for the UL-Map appended to the DLMap. The "Allocation Start Time" field of the UL-Map specifies the start of the uplink
subframe.
If Start Time Base is set to DL Subframe End, the "Allocation Start Time" of the ULMap is set to the end of the downlink subframe + Allocation Start Time parameter set
below.
When Start Time Base is set to Frame Start, the Allocation Start Time of the UL-Map is
set to the beginning of the frame + "Allocation Start Time" parameter set below.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DLMap:AMODe on page 201
Allocation Start Time OFDM
Sets the "Allocation Start Time" in the UL-Map, appended to the DL-Map.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DLMap:ATIMe on page 201
UL-MAP File OFDM
Opens the dialog for selecting the UL-Map file.
Remote command:
n.a.
Append UCD OFDM
If activated, the UCD is appended to the DL-MAP. The UCD message is transmitted
with its own MAC header and CRC, included in the same burst allocation used by the
DL-MAP.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:DLMap:UCD:STATe on page 201
36Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Generate UL-MAP Uplink OFDM
3.6 Generate UL-MAP Uplink OFDM
The "Generate UL-MAP" dialog is reached via the "Generate UL-MAP..." button in the
frame configuration dialog.
Provided are the following settings:
UCD Count OFDM
Sets the value for the UCD count.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:UCD on page 215
Save UL-MAP Data OFDM
Opens the "File Select" dialog for saving the current UL-MAP.
The name of the file is specified in the "File name" entry field, the directory selected in
the save into field. The file is saved by pressing the "Save" button.
The file is stored with the predefined file extension *.dm_iqd. The file name and the
directory it is stored in are user-definable.
The saved *.dm_iqd file is in the data list format and contains a UL-MAP that
describes the current uplink subframe.
The following list shows the parameters the UL-MAP is composed of:
●
UCD Count
Set to UCD Count specified above
●
Allocation Start Time
Set to 0. Can be modified later when loading the UL-MAP in downlink mode
●
CID
CID from the "More Param" panel for each burst
●
Start Time
Burst start in OFDM symbols for each burst
●
Subchannel Index
Subchannel Index set in the Frame Configuration panel
●
UIUC
UIUC from the "More Param" panel for each burst
●
Duration
Burst duration in symbols
●
Midamble repetition interval
Midamble repetition for each burst
Generating a valid UL-MAP
37Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
UL-MAP Configuration Downlink OFDM
The following steps are required to generate a valid UL-MAP
●
1. Switch to uplink mode
●
2. Define the layout of the uplink subframe by setting a number of bursts and specifying the parameters above for each burst
●
3. Select Generate UL-MAP and save the UL-MAP to a file
●
4. Switch to downlink mode
●
5. Set one of the downlink bursts to Burst Type UL-MAP
●
6. Open the "More Params" panel
●
7. Select UL-MAP File and load the file created before.
The downlink frame is then transmitting a UL-MAP that specifies the uplink structure
defined in uplink mode before.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:ULMap:CREate on page 215
3.7 UL-MAP Configuration Downlink OFDM
The "UL-MAP" dialog is enabled for burst type UL-MAP only and can be reached via
the "More Param" button in the OFDM burst table.
Provided are the following settings:
Allocation Start Time Base
Selects the Allocation Start Time base. The Allocation Start Time field of the UL-MAP
specifies the start of the uplink subframe.
When Start Time Base is set to DL Subframe End, the Allocation Start Time of the ULMAP is set to the end of the downlink subframe + the "Allocation Start Time" parameter
set below.
When Start Time Base is set to Frame Start, the Allocation Start Time of the UL-MAP
is set to the beginning of the frame + the Allocation Start Time parameter set below.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:ULMap:AMODe on page 206
Allocation Start Time
Sets the Allocation Start Time in the UL-MAP.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:ULMap:ATIMe on page 207
38Operating Manual 1171.5277.12 ─ 16
UL-MAP File
Calls the dialog for selecting the UL-map file.
Remote command:
n.a.
WiMAX User InterfaceIEEE 802.16 WiMAX
More Parameters Uplink OFDM
3.8 More Parameters Uplink OFDM
The "More parameters" dialog is accessed via the OFDM burst table.
Provided are the following settings:
Configure MAC
Accesses the dialog for configuring the MAC header panel for the selected burst. This
dialog is described in chapter 3.9, "MAC Header Configuration OFDM", on page 39
Remote command:
n.a.
UIUC OFDM
Sets the specific UIUC.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:UIUC on page 206
MAC CID
Sets the connection control identifier (CID) of the medium access control layer (MAC).
The CID identifies a connection to equivalent peers in the MAC of the base station and
subscriber station.
This parameter is identical to the CID set in the MAC Header settings.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:MAC:CID on page 203
3.9 MAC Header Configuration OFDM
The "MAC" dialog is reached via the "Configure MAC"... button of the "More Parameters dialog" of the burst table.
39Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
MAC Header Configuration OFDM
This dialog provides settings for a generic MAC header, which is placed at the beginning of the burst when activated.
In addition CRC (cyclic redundancy check) can be activated, which is added at the end
of the burst. It covers MAC header and all data.
Provided are the following settings:
CRC State
Activates/deactivates the checksum determination. The state of the CRC can be set
independently of the state of MAC header generation.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:MAC:CRC:STATe on page 203
MAC Header State
Activates the generation of the generic MAC header.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:MAC:STATe on page 204
MAC CID
Sets the connection control identifier (CID) of the medium access control layer (MAC).
The CID identifies a connection to equivalent peers in the MAC of the base station and
subscriber station.
This parameter is identical to the CID set in the MAC Header settings.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:MAC:CID on page 203
40Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDMA
Payload encrypted
Activates/deactivates payload encryption.
If activated, the EC (encryption control) field is set to 1 and the EKS (encryption key
sequence) field can be set.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:MAC:ENCRypted:STATe
on page 204
EKS
Sets the EKS (encryption key sequence) value in the MAC header. The payload
encryption itself is not performed by the signal generator.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:MAC:EKS on page 203
Mac Type
Specifies the MAC type.
The value of the 6-bit type field is set which indicates the payload type, including the
presence of subheaders.
Remote command:
[:SOURce<hw>]:BB:WIMax:OFDM:BURSt<ch0>:MAC:TYPE on page 204
3.10 Frame Configuration OFDMA
This dialog provides all parameters to configure frames in OFDMA mode.
3.10.1 Frame Configuration Common Settings
Provided are the following settings:
41Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDMA
Frequency Band OFDMA
Selects the frequency band for the carrier frequencies. The available ranges for setting
the channel bandwidth and the sampling rate depend on the selection here.
"ETSI"
"MMDS"
"WCS"
"U-NII"
"WiBro"
"User"
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:FBANd on page 140
The frequency band as defined by the European Telecommunications
Standards Institute applies.
The range is 1.75 to 28 MHz for the channel bandwidth and 2 to 32
MHz for the sampling rate.
The frequency band as defined by the "Multichannel Multipoint Distribution Service" applies. The RF frequency range is 2500 to 2686
MHz.
The range is 1.50 to 24 MHz for the channel bandwidth and 1.68 to
26.88 MHz for the sampling rate.
The frequency band as defined by the "Wireless Communication Service" applies. It is in the 2.3 GHz band of the electromagnetic spectrum from 2305 to 2320 MHz and 2345 to 2360 MHz.
The range is 2.5 to 15 MHz for the channel bandwidth and 2.8 to 16.8
MHz for the sampling rate.
The frequency band as defined by the "Unlicensed National Information Infrastructure" applies. It is in the 5 GHz band of the electromagnetic spectrum from 5150 to 5350 GHz and 5750 to 5825 GHz.
The range is 10 to 20 MHz for the channel bandwidth and 11.2 to 22
MHz for the sampling rate.
The frequency band as defined by the Telecommunications Technology Association of Korea. It is in the 2.3 GHz band of the electromagnetic spectrum.
This mode is provided for choosing any other channel bandwidth /
sampling rate combination.
The range is 1.25 to 28 MHz for the channel bandwidth and 1.4 to 32
MHz for the sampling rate.
Channel Bandwidth OFDMA
Sets the channel bandwidth. The range is 1.25 to 28 MHz.
The selected channel bandwidth has to be a multiple of 1.25, 1.5, 1.75, 2.0 or 2.75
MHz. The channel bandwidth determines the parameter n (see Sampling Ratio n
OFDMA).
●
For channel bandwidths
– that are a multiple of 1.75 MHz then n = 8/7
– that are a multiple of 1.5 MHz then n = 28/25
– that are a multiple of 1.25 MHz then n = 28/25
– that are a multiple of 2.75 MHz then n = 28/25
– that are a multiple of 2.0 MHz then n = 28/25
●
else for channel bandwidths not otherwise specified then n = 8/7
The sampling rate is derived from the channel bandwidth as follows:
42Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDMA
SamplingRate = floor (n * ChannelBandwidth / 8000) * 8000
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:BW on page 139
Sampling Ratio n OFDMA
Indicates the sampling ratio. The sampling ratio is determined by the channel bandwidth (see Channel Bandwidth OFDMA).
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:N? on page 142
Sampling Rate OFDMA
Sets the sampling rate. The possible settings depend on the selected frequency band.
The full range in User mode is 1.44 to 32 MHz.
The sampling rate is related to the channel bandwidth by the parameter n:
SamplingRate = floor (n * ChannelBandwidth / 8000) * 8000
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:SRATe on page 143
Number of Zones/Segments OFDMA
Sets the number of active zones/segments in one frame.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE:COUNt on page 144
Preamble Mode OFDMA
Selects the mode for selecting the preamble index.
"Auto"
"User"
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:PREamble:INDex:MODE on page 143
Preamble Index OFDMA
Sets the preamble index to one of the available indices from 1 to 113 in preamble
mode "user".
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:PREamble:INDex on page 143
The preamble index value is automatically derived from the segments
used in the first zone and the IDcell parameter. The Preamble Index
field below shows the used preamble index. If more than one segment is active in the first zone, the Preamble Index shows -1. In this
case, a multi-segment preamble is generated.
Sets the preamble index to one of the available indices from 1 to 113
specified in the "Preamble Index" field.
Tg/Tb Ratio OFDMA
Selects the ratio of guard period to symbol period.
This value sets the length of the cyclic prefix in fractions of the symbol period.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:TGTB on page 144
43Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDMA
FFT Size OFDMA
Selects the FFT size.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:FFT on page 140
IDCell OFDMA
Sets the IDcell. The IDcell is used in the preamble, as PermBase parameter for the
permutation equations in the first downlink zone and partly sets the subcarrier randomizer initialization vector in the first downlink zone.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:IDCell on page 141
Show Time Plan OFDMA
Calls the graphical display of the OFDMA Time Plan (see chapter 3.10.2, "Time Plan",
on page 44).
Remote command:
n.a.
3.10.2 Time Plan
The time plan indicates the assignment of the active bursts. The x-axis shows the
OFDMA symbol number relative to frame/zone start on the top of the diagram and the
time in ms relative to frame/zone start on the bottom of the diagram. The vertical line
on the right side shows the frame boundary. The y-axis indicates the physical/logical
subchannel numbers.
The bursts are numbered with ZoneIndex.
Time Plan View Mode OFDMA
Selects the display range.
44Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDMA
Remote-control command: n.a.
"Total Frame"
The display range extends to all zones including the gap to the frame
duration. The y-axis shows the physical subchannels. All logical subchannels are mapped to physical before display. In uplink mode, the
data subchannel rotation is not displayed.
"Subframe"
The display range is zoomed to the subframe of the corresponding
link direction.
"Zone"
The display range is zoomed to the selected zone index. The y-axis
shows the logical subchannels of the zone/segment.
Remote command:
n.a.
Time Plan Zone Index OFDMA
Selects the zone index to be displayed.
This feature is only available, if "Zone" is selected in the "View Mode" field.
Remote command:
n.a.
3.10.3 Zone Table
The "Zone table" is located in the lower part of the dialog. The zone table is where the
individual zone parameters are set.
Zone Index OFDMA
Displays the consecutive zone index from 0 to 7.
Remote command:
n.a.
Zone Number OFDMA
Sets the zone number of the zone. The value range is 0 to 7. Zones are generated in
the order of zone number, the lowest zone number is generated first. If the same zone
number is applied to more than one row, different segments can be used within one
zone. In this case, the segment numbers must differ and the activated subchannels of
the segments must not overlap.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:NUMBer on page 147
45Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Frame Configuration OFDMA
Zone Type OFDMA
Selects the type of subcarrier permutation for the zone.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:TYPE on page 196
Segment OFDMA
Selects the segment of the zone index. Multiple segments within one zone can be configured by setting the same zone number and configuring different segment numbers
for each zone index. The activated subchannels must not overlap between the segments of one zone.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SEGMent on page 149
No. Of Symbols OFDMA
Sets the zone length in number of symbols. Zones with identical zone number have the
same length, as they overlap in time.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SYMBol:COUNt on page 157
Auto OFDMA
Activates or deactivates automatic zone length. In auto mode, the number of symbols
in the zone is derived from the configured bursts such that all bursts fit into the zone,
except if the frame duration is exceeded.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SYMBol:COUNt:AUTO
on page 157
Offset Symbol OFDMA
Displays the symbol offset of the zone.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SYMBol:OFFSet? on page 158
PermBase OFDMA
Selects the PermBase of the zone.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:PERMbase on page 147
PRBS_ID OFDMA
Selects the PRBS_ID of the zone.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:PRBSid on page 148
Configure Zone OFDMA
Calls the dialog for configuring the parameters of the zone.
Remote command:
n.a.
46Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Zone Configuration OFDMA
3.11 Zone Configuration OFDMA
This dialog provides all parameters to configure zones in OFDMA mode.
3.11.1 OFDMA Common Zone Settings
Provided are the following settings:
Subcarrier Randomization OFDMA
Activates or deactivates the subcarrier randomization. Subcarrier randomization is performed after PUSC/FUSC/AMC permutation and before IFFT conversion.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SCARrier:RANDomizer
on page 148
Subchannel Rotation OFDMA
(Available for zone type PUSC in link direction uplink only)
Activates or deactivates the subchannel rotation.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:SUBChannel:ROTation
on page 195
CSTD..
(Available for STC Mode CSTD only)
Calls the dialog for configuring the Cyclic Shift Transmit Diversity (seechapter 3.13,
"CSTD OFDMA", on page 61 ).
Remote command:
n.a.
Configure Band AMC
(Available for zone type AMC2x3 only)
47Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Zone Configuration OFDMA
Accesses the dialog for configuring Band AMC mode.
Use Physical Bands Bitmap ← Configure Band AMC
Activates/deactivates Band AMC mode.
If activated, the "Physical Bands Bitmap" parameter specifies the active physical
bands.
If deactivated, all available physical bands are used.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:AMC:BITMap[:STATe]
on page 145
Physical Bands Bitmap ← Configure Band AMC
Sets the AMC physical bands bitmap pattern in hexadecimal input format.
The LSB (right most bit) corresponds to physical band 0 (the lowest frequency OFDMA
subcarriers). Deactivated bits in this pattern deactivate the corresponding bands, i.e.
they will not be used for allocating bursts.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:AMC:BITMap:PATTern
on page 144
Configure active Subchannels OFDMA
Calls the dialog for activating/deactivating subchannels.
Use All Subchannels ← Configure active Subchannels OFDMA
Activates the generation of all subchannels.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:SUBChannel:MODE
on page 195
48Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Zone Configuration OFDMA
Use Subchannels x...y (downlink PUSC only) ← Configure active Subchannels
OFDMA
Activates the generation of the selected group(s) of subchannels.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:SUBChannel<ch>:MAP
on page 196
Allocated Subchannels Bitmap (uplink only) ← Configure active Subchannels
OFDMA
In uplink mode, each physical subchannel can be individually activated or deactivated.
This is realized with a 9 byte field identical to the UL allocated subchannels bitmap in
the UCD message. The bytes of the bitmap are read from left to right and specify the
physical subchannels in LSB first order. The LSB of the first (most left) byte selects the
physical subchannel 0.
The same order applies for all FFT Sizes. Subchannel bitmap bits that are not needed
in modes with less than 70 physical subchannels are discarded.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:SUBChannel:PATTern
on page 195
Show Time Plan OFDMA
Accesses the graphical display of the OFDMA Time Plan (see chapter 3.10.2, "Time
Plan", on page 44).
Remote command:
n.a.
No of Bursts OFDMA
Sets the number of active bursts in the zone/segment.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt[:COUNt] on page 190
Space-Time Coding Mode OFDMA
Sets the space-time coding mode or switches diversity off.
"Off"
"2 Antennas, Matrix A/ 2 Antennas, Matrix B"
"4 Antennas, Matrix A/ 4 Antennas, Matrix B/ 4 Antennas, Matrix C"
"Burst Defined"
"Collaborative Multiplexing"
Deactivates diversity.
Sets the space-time coding mode to 2 Antennas and Matrix A or
Matrix B encoding respectively.
Sets the space-time coding mode to 4 Antennas with Matrix A, Matrix
B or Matrix C encoding respectively.
Enables mixing Matrix A and Matrix B encoding on burst level.
The used matrix can be defined in the More Parameter dialog box of
each burst.
See also Data Configuration OFDMA and UL-MAP Configuration
Downlink OFDM.
Enables Uplink Collaborative spatial multiplexing.
49Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Zone Configuration OFDMA
"CSTD"
Enables Cyclic Shift Transmit Diversity.
The CSTD parameters are set in the CSTD dialog (see CSTD
OFDMA).
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:STC:MODE on page 157
Space-Time Coding Antenna OFDMA
Sets the antenna for the space-time coding modes.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:STC:ANTenna on page 156
Generate UL-MAP
(Available for link direction uplink only)
Accesses the dialog for generating a UL-MAP.
Remote command:
n.a.
Dedicated Pilots OFDMA
(This feature is available only for zone type AMC and PUSC with link direction Downlink).
When activated, pilot symbols are generated for subchannels with allocated bursts
only. When deactivated, pilot symbols are generated for all subchannels allocated to
the current segment, whether or not bursts are active on these subchannels.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:PILDedicated on page 148
Data List Management…
Accesses the "Data List Management" dialog, used to create and edit a data list.
Pilot Pattern OFDMA
Sets the pilot pattern in uplink Collaborative Multiplexing mode.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:STC:PILotpattern
on page 157
Zone Boosting OFDMA
Sets an additional zone boosting in dB.
The zone boosing is applied to both the data and pilot carriers.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:BOOSt on page 145
3.11.2 Burst Table
The "burst table" is located in the lower part of the dialog where individual burst parameters are set. A graphic display of the current burst locations in time and subchannel
space can be viewed with the "Show Time Plan" button.
50Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Zone Configuration OFDMA
Each frame supports up to 64 bursts with individual parameters. For both transmission
directions, different modulations and channel coding rates are available. For each
burst, an optional generic MAC header and CRC is provided.
Provided are the following settings:
Burst Index OFDMA
Displays the consecutive burst index from 0 to 63.
All the rows are always displayed, even if the bursts are inactive. They are switched on
and off by the selection of "No. of Bursts" above the table. The active bursts are highlighted.
Remote command:
n.a.
Modulation and Coding Rate OFDMA
Selects the modulation and channel coding rate. Channel coding includes randomization, convolutional/turbo coding and interleaving.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:FORMat
on page 165
Channel Coding OFDMA
Selects the channel coding mode. Available modes are CC (convolutional coding),
CTC (convolutional turbo coding) or Off. In Off mode, channel coding is switched off
completely.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:CCODing:MODE
on page 159
Data Length OFDMA
Determines the data length in bytes.
The given number of bytes is read from the data source. The total number of data
bytes in the burst (before channel coding) is determined as follows:
TotalDataBytes = DataLength + MACHeaderBytes + CRCBytes
Additionally padding with 0xFF bytes is applied at the end of the data sequence to fill
up the allocated slots specified by "No. of Subch" and "No. of Symb" in downlink mode
and "Duration [Slots]" in uplink mode. Thus, the Data Length can be lower than the
burst's allocated number of bytes.
51Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Zone Configuration OFDMA
Up to 10 000 data bytes can be set for each burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DATA:LENGth
on page 161
Number of Subchannels OFDMA
Enters the number of subchannels for the selected burst. If the number of subchannels
is changed, the data length is adjusted to fill the allocated space defined by "No. of
Subch" and "No. of Symb" with data so that no padding has to be applied. The data
length can be lowered afterwards if data bytes less than the allocated number shall be
read from the data source.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:SUBChannel[:
COUNt] on page 184
Number of Symbols OFDMA
Enters the number of symbols for the selected burst.
If the number of symbols is changed, the data length is adjusted to fill the allocated
space defined by "No. of Subch" and "No. of Symb" with data so that no padding has
to be applied. The data length can be decreased afterwards if data bytes less than the
allocated number shall be read from the data source. The entered number of symbols
is automatically adjusted to a multiple of the number of symbols per slot for the set
subcarrier permutation.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:SYMBol[:
COUNt] on page 184
Duration-Slots OFDMA
Enters the number of slots for the selected burst. If the number of slots is changed, the
data length is adjusted to fill the specified number of slots with data so that no padding
has to be applied.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:SLOT:COUNt
on page 184
Offset Subchannel OFDMA
Indicates the subchannel offset for the selected burst. This value can be modified after
"Auto Offset" is deactivated.
It is possible that bursts overlap in manual offset mode. The Conflict column indicates
overlapping bursts.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:OFFSet:
SUBChannel on page 176
52Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Zone Configuration OFDMA
Offset Symbol OFDMA
Indicates the symbol offset for the selected burst. The symbol offset is specified relative to zone start. In the first downlink zone, symbol offset 0 refers to the first symbol
after the preamble.
This value can be modified after "Auto Offset" is deactivated.
The set symbol offset is rounded to a multiple of the number of symbols per slot
defined by the set subcarrier permutation.
It is possible that bursts overlap in manual offset mode. The Conflict column indicates
overlapping bursts.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:OFFSet:
SYMBol on page 176
Auto OFDMA
Activates/deactivates the "Auto Offset" mode. In Auto mode, "Offset Subchannel" and
"Offset Symbol" are set such that bursts are not overlapping in the subchannel/symbol
space.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:OFFSet:MODE
on page 175
Data Source OFDMA
Selects data source for the selected bursts.
The following standard data sources are available:
●
"All 0, All 1"
An internally generated sequence containing 0 data or 1 data.
●
"PNxx"
An internally generated pseudo-random noise sequence.
●
"Pattern"
An internally generated sequence according to a bit pattern.
Use the "Pattern" box to define the bit pattern.
●
"Data List/Select DList"
A binary data from a data list, internally or externally generated.
Select "Select DList" to access the standard "Select List" dialog.
– Select the "Select Data List > navigate to the list file *.dm_iqd > Select" to
select an existing data list.
– Use the "New" and "Edit" functions to create internally new data list or to edit
an existing one.
– Use the standard "File Manager" function to transfer external data lists to the
instrument.
53Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Zone Configuration OFDMA
See also "Main Dialog > Data List Management".
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DATA
on page 160
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DATA:PATTern
on page 161
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DATA:DSELect
on page 160
Boost OFDMA
Sets the burst power in dB. This setting affects the data tones only in downlink mode,
the pilot power is fixed. In uplink, the setting affects both data and pilot tones.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:POWer
on page 182
Burst Type OFDMA
Selects the burst type from Data, FCH, DL-MAP, UL-MAP, Ranging, HARQ, Fast
Feedback or SUB-MAP.
"DATA"
"FCH"
"DL-MAP"
"UL-MAP"
"Ranging"
"HARQ"
"Fast Feedback"
"DCD"
"UCD"
Regular bursts are called "Data" bursts. All data sources are available
for this type of burst.
An FCH is generated at subchannel and symbol offset 0. See FCH
Configuration Downlink OFDMA on the FCH contents.
A DL-MAP is generated, taking into account all active bursts of all
zones. SeeDL-MAP Configuration Downlink OFDMA on the DL-MAP
contents.
A UL-MAP is generated using the specified data list, including additional parameters from the More Param panel. See UL-MAP Configu-
ration Downlink OFDMA for more information on how to create UL-
MAP bursts.
An uplink ranging allocation is configured, which can be used for initial ranging, periodic ranging, or bandwidth request transmissions.
See Ranging Uplink OFDMA for more information on how to create
ranging channels. The burst type Ranging requires a PUSC zone.
A HARQ burst is generated. See HARQ Configuration OFDMA for
more information on how to create HARQ bursts.
A fast feedback burst is generated. See Fast Feedback Configuration
OFDMA for more information on how to create fast feedback bursts.
The burst type Fast Feedback requires a PUSC zone.
A regular data burst containing a DCD message is generated. The
DCD message specifies a downlink burst profile for each DIUC value
that is being used in the zone configuration.
A regular data burst containing a UCD message is generated. The
UCD message specifies an uplink burst profile for each UIUC value
that is being used in the zone configuration.
54Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Sounding Zone Configuration OFDMA
"SUB-MAP"
A SUB-DL-UL-MAP message is generated.
Altogether up to three SUB-DL-UL-MAP messages can be enabled
for all zones.
The SUB-DL-UL-MAP message additional parameters can be configured in the SUB-DL-UL-MAP Configuration OFDMA dialog reached
from the "More Param" panel.
For each Data, UL-MAP, HARQ, DCD or UCD burst inclusion into
one of the three available SUB-DL-UL-MAPs can be activated. In this
case, the corresponding map carries a DL-MAP IE specifying the
position of the included burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:TYPE
on page 185
More Parameter OFDMA
Accesses the dialog for configuring additional parameters for the bursts.
The dialog depends on the selected burst type.
Remote command:
n.a.
Conflict OFDMA
Indicates a conflict between the settings of the bursts.
Conflicts can occur if subchannel and symbol offsets are set manually and two or more
bursts overlap. Bursts can also overlap with the FCH or DL-MAP. The position of FCH
and DL-MAP is fixed and cannot be changed. In uplink mode, a conflict is also indicated for bursts that do not fit into the available zone space and are therefore omitted.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:CONFlict[:
STATe]? on page 159
3.12 Sounding Zone Configuration OFDMA
This dialog provides all parameters to configure the sounding zones in OFDMA mode.
55Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Sounding Zone Configuration OFDMA
3.12.1 OFDMA Sounding Zone Settings
Provided are the following settings:
Sounding Type OFDMA
Selects either sounding type A or B.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:TYPE on page 156
Sounding Relevance Flag OFDMA
Selects whether sounding is relevant individually for each CID or for all CIDs.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:RELevance:FLAG
on page 155
Separability Type OFDMA
(only for Sounding Type A)
Selects the sounding separability type.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:SEParability
on page 155
56Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Sounding Zone Configuration OFDMA
Total Number Of CIDs OFDMA
Sets the total number of CIDs.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID:COUNt
on page 149
Zone Boosting OFDMA
Sets an additional zone boosting in dB.
The zone boosing is applied to both the data and pilot carriers.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:BOOSt on page 145
Allocation Mode OFDMA
(only for sounding type A)
Selects the frequency allocation mode for sounding CIDs.
"Normal"
"Band AMC"
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:AMODe on page 149
The used sounding allocations are specified with "Number Of Freq.
Bands" and "Start Freq. Band".
A "Band Bitmap" pattern determines the frequencies to be sent.
No. Of Symbols OFDMA
Sets the zone length in number of symbols. Zones with identical zone number have the
same length, as they overlap in time.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SYMBol:COUNt on page 157
Sounding Relevance OFDMA
(only if Sounding Relevance Flag is set to Same For All CIDs)
Selects the sounding relevance mode.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:RELevance:MODE
on page 155
Max Cyclic Shift Index OFDMA
(only for Sounding Type A and Separability Type Cyclic Shift)
Sets the value for the maximum cyclic shift index.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CMAXimum
on page 153
Permutation OFDMA
(only for Sounding Type B)
57Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Sounding Zone Configuration OFDMA
Indicates the permutation used for this sounding zone.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:PERMutation?
on page 155
DL PermBase OFDMA
(only for Sounding Type B)
Sets the value for the DL Perm Base.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:DLPermbase
on page 154
Decimation Value OFDMA
(only for Sounding Type A and Separability Type Decimated Subcarriers)
Sets the value for the decimation.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:DECimation:VALue
on page 154
Decimation Offset Randomization OFDMA
(only for Sounding Type A and Separability Type Decimated Subcarriers)
Activates/deactivates the decimation offset randomization.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:DECimation:
RANDomization[:STATe] on page 154
Shift Value U OFDMA
(only for sounding type A)
Sets the shift value (u) used for decimation offset and cyclic shift index.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:UVAL on page 156
3.12.2 Sounding Table
The "sounding table" is located in the lower part of the dialog where individual sounding parameters for each CID are set.
58Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Sounding Zone Configuration OFDMA
Sounding Index OFDMA
Displays the consecutive CID index from 0 to 15.
All the rows are always displayed, even if the CIDs are inactive. They are switched on
and off by the selection of "Total Number Of CIDs" above the table. The active CIDs
are highlighted.
Remote command:
n.a.
Sounding Symbol OFDMA
Sets the symbol used for this CID from the available symbols of the zone. Each sounding CID occupies one symbol only.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:SYMBol
on page 153
CID OFDMA
Sets the CID (connection control identifier).
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:CID
on page 150
Power Boost OFDMA
Activates/deactivates the power boost.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:POWer[:
STATe] on page 152
No. Of Freq. Bands OFDMA
(only for Sounding Type A and normal Allocation Mode)
59Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Sounding Zone Configuration OFDMA
Sets the number of frequency bands used by the corresponding CID.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:FBANd[:
COUNt] on page 151
Start Freq. Band OFDMA
(only for Sounding Type A and normal Allocation Mode)
Sets the start frequency band.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:FBANd:
STARt on page 151
Band Bitmap OFDMA
(only for Sounding Type A and Allocation Mode set to Band AMC)
Sets the logical band bitmap of the corresponding CID.
A "1" enables sounding transmission in the corresponding logical band, a "0" disables
it.
The right-most bit (LSB) corresponds to logical band 0 (the lowest frequency subcarriers).
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:BBITmap
on page 150
Sounding Relevance
Activates/deactivates the sounding relevance.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:
RELevance[:STATe] on page 152
Cyclic Shift Index OFDMA
(only for Sounding Type A)
Sets the value for the cyclic shift index. If the "Separability Type" is set to "Decimated
Subcarriers", the cyclic shift index is not used.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:CINDex
on page 150
Decimation Offset OFDMA
(only for Sounding Type A)
Sets the value for the decimation offset. If the "Separability Type" is set to "Cyclic
Shift", the decimation offset is not used.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:
DECoffset on page 151
60Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
CSTD OFDMA
Periodicity
Sets the value for the periodicity.
A value of 0 transmits this sounding CID only once at the beginning of the signal
sequence.
A value of 1 activates continuous transmission of the sounding CID with each frame.
Larger values specify the period in frames that active sounding CIDs occur.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:
PERiodicity on page 152
No. Of Subch
(only for Sounding Type B)
Sets the number of subchannels.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:
SUBChannel[:COUNt] on page 153
Offset Subch
(only for Sounding Type B)
Sets the subchannel offset.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:SOUNding:CID<ch0>:
SUBChannel:OFFSet on page 152
3.13 CSTD OFDMA
The "CSTD" dialog is reached via the "CSTD" button in the OFDMA zone configuration
dialog. The CSTD is only available in downlink for STC Mode set to CSTD.
A zone with activated CSTD is encoded like a regular SISO zone (STC off). After the
IFFT a multi-tap delay line is applied to the time-domain signal. Each tap can be weighted with a different linear factor before summation of all taps. The cyclic prefix is
applied on the sum output. Different cyclic-delay filters can be applied to every
antenna.
61Operating Manual 1171.5277.12 ─ 16
The following describes the CSTD options in OFDMA mode.
WiMAX User InterfaceIEEE 802.16 WiMAX
CSTD OFDMA
Provided are the following settings:
Number Of Antennas OFDMA
Sets the number of antennas used for cyclic shift transmit diversity (CSTD).
One baseband is only generating one antenna at a time.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:CSTD:ANTCount on page 145
Show Configuration For OFDMA
Selects the antenna for which the configuration is made.
This parameter selects which antenna to configure with the parameters below. The
antenna actually generated by the current baseband is selected with "Space-Time
Coding Antenna" in the zone configuration dialogue.
Remote command:
n.a.
62Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
FCH Configuration Downlink OFDMA
Number Of Taps OFDMA
Sets the number of samples by which the OFDM symbols are cyclically shifted on the
given tap.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:CSTD<ch0>:TAPCount
on page 146
Cyclic Delay (Samples) OFDMA
Sets the cyclic delay with that the OFDM symbols of the selected antenna will be cyclically shifted.
With CSTD, each antenna sends a circularly shifted version of the same OFDM symbol, i.e. the antenna selected with the parameter "Show Configuration For" will send
the same OFDM symbol as the other antennas, but the OFDM symbol is circularly shifted by the samples set with the parameter Cyclic Delay.
Positive values remove the specified number of samples from the end of the symbol
and prepend them to the start of the symbol.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:CSTD<ch0>:CDELay<dir0>
on page 146
Liner Gain OFDMA
Sets a linear gain factor for the corresponding tap.
The gain factors are applied to the symbols before summation fo all taps.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:CSTD<ch0>:GAIN<dir0>
on page 146
3.14 FCH Configuration Downlink OFDMA
The "FCH Configuration" dialog is accessed via the "More Param" button in the
OFDMA burst table. It contains the parameters required to configure the FCH options
in OFDMA mode. The FCH is only available in downlink mode.
Provided are the following settings:
FCH Mode OFDMA
Selects the mode for generating the FCH.
63Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
FCH Configuration Downlink OFDMA
The Channel Coding of the FCH is performed both in "Auto" and "User" mode.
"Auto"
"User"
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm:ZONE<st0>:FCH:MODE on page 147
In "Auto" mode, the DLFP (Downlink Frame Prefix) fields, which form
the FCH, are filled automatically with parameters specified at different
locations.
The following mapping applies in Auto mode:
●
Used subchannel bitmap
Set to the bitmap specified in the "Configure active Subchannels"
panel.
●
Repetition_Coding_Indication
Specifies the DL-MAP repetition coding set in the "Configure DLMAP" panel.
●
Coding_Indication
Specifies channel coding of the DL-MAP (CC or CTC)
●
DL-Map_Length
Set to the number of slots allocated for the DL-MAP.
The FCH is transmitted with QPSK ½ and repetition coding of 4. For
FFT Size 128 a reduced FCH is transmitted in one slot.
In "User" mode, the FCH is filled with data specified under Data
Source. This enables any arbitrary data to be sent with the FCH
burst. 24 bits are read from the data source, these bits are repeated
once to form 48 bits. The FCH is transmitted with QPSK ½ and repetition coding of 4. For FFT Size 128 a reduced FCH of size 12 bits is
transmitted in one slot.
Data Source OFDMA
Selects data source for the selected bursts.
The following standard data sources are available:
●
"All 0, All 1"
An internally generated sequence containing 0 data or 1 data.
●
"PNxx"
An internally generated pseudo-random noise sequence.
●
"Pattern"
An internally generated sequence according to a bit pattern.
Use the "Pattern" box to define the bit pattern.
●
"Data List/Select DList"
A binary data from a data list, internally or externally generated.
Select "Select DList" to access the standard "Select List" dialog.
– Select the "Select Data List > navigate to the list file *.dm_iqd > Select" to
select an existing data list.
– Use the "New" and "Edit" functions to create internally new data list or to edit
an existing one.
– Use the standard "File Manager" function to transfer external data lists to the
instrument.
64Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
DL-MAP Configuration Downlink OFDMA
See also "Main Dialog > Data List Management".
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DATA
on page 160
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DATA:PATTern
on page 161
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DATA:DSELect
on page 160
3.15 DL-MAP Configuration Downlink OFDMA
The DL-MAP "Configuration" dialog is accessed via the "More Param" button in the
OFDMA burst table. The DL-MAP is only available in OFDMA downlink mode.
Provided are the following settings:
DL-MAP Mode OFDMA
Selects the mode for generating the DL-MAP.
Channel Coding of the DL-MAP is performed both in "Auto" and "User" mode.
65Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
DL-MAP Configuration Downlink OFDMA
"Auto"
In "Auto" mode, the DL-MAP is filled automatically with parameters
specified at different locations.
The following mapping applies in Auto mode:
●
Frame Duration Code
Specified by the Frame Duration set in the WiMAX main panel.
●
Frame Number
Starts with the value specified by "Frame Number Offset" in the
first generated frame and advances by 1 in every following frame.
●
DCD Count
Directly set by the "DCD Count" field.
●
Base Station ID
48 bits specified by the "Base Station ID" field.
●
No. OFDMA symbols
Set to the total number of OFDMA symbols in all downlink zones
For each burst:
●
DIUC
Set to the "DIUC" field in the "More Param" Panel.
●
CID
Set to the "CID" field in the More "Param Panel".This field is only
included if "Include CID-SWITCH_IE()" is active.
●
OFDMA Symbol offset
Set to "Offset Symb" +1 for the first zone and to the absolute symbol offset in all other zones.
●
Subchannel offset
Set to "Offset Subch" of the burst table.
●
Boosting
Depends on the "Boost" setting of the corresponding burst.
The following mapping applies:
000: 0dB
001: +6dB
010: -6dB
011: +9dB
100: +3dB
101: -3dB
110: -9dB
111: -12dB
000 is set if any other value is specified for "Boost".
●
No. OFDMA Symbols
Set to "No. of Symb" of the burst table.
●
No. Subchannels
Set to "No. of Subch" of the burst table.
●
Repetition Coding Indication
Set to Repetition Coding in the "More Param" Panel.
66Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
DL-MAP Configuration Downlink OFDMA
"User"
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:MODE on page 194
DL-MAP Repetition Coding OFDMA
Repetition coding can be activated for the DL-MAP by specifying any value other than
0.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:REPCoding
on page 194
Frame Number Offset DL-MAP OFDMA
Sets the frame number offset.
This value is added to the current frame number of the sequence. The result is used as
Frame Number in the DL-MAP (in Auto mode).
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:FNOFfset
on page 193
DCD Count DL-MAP OFDMA
Sets the DCD count value.
This value is used for the corresponding DL-MAP field (in "Auto" mode).
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:DATA:DCD[:COUNt]
on page 192
In "User" mode, the DL-MAP is filled with data specified under Data
Source. This enables any arbitrary data to be sent with the DL-MAP
burst.
Base Station ID OFDMA
Sets the Base Station ID.
This value is used for the corresponding DL-MAP field in ("Auto" mode).
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:BSID on page 190
Configure MAC OFDMA
Calls the dialog for configuring the Mac header panel for the DL-MAP (Refer to chap-
ter 3.23, "MAC Header Configuration OFDMA", on page 90)
Remote command:
n.a.
Include CID-Switch_IE() OFDMA
Includes/excludes the CID-Switch_IE().
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:IIE:STATe
on page 193
67Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
DL-MAP Configuration Downlink OFDMA
Append DCD OFDMA
If activated, the DCD is appended to the DL-MAP. The DCD message carries its own
MAC header and CRC, but is included within the DL-MAP burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:DCD:STATe
on page 193
DCD CID OFDMA
(only if Append DCD is ON)
Enters the value for the DCD CID.
This CID (connection control identifier) is independent from the DL-Map CID and is
only used for the DCD message.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:DCD:CID on page 192
Compressed Map OFDMA
If activated, a compressed map is generated instead of a normal map.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:COMPressed:STATe
on page 191
Append Compressed UL-Map OFDMA
(only if Compressed Map is ON)
If activated, a compressed UL-Map is appended to the DL-Map.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:COMPressed:ULMap:
STATe on page 192
Allocation Start Time Base OFDMA
Selects the Allocation Start Time base, required for the UL-Map appended to the DLMap. The Allocation Start Time field of the UL-Map specifies the start of the uplink subframe.
If Start Time Base is set to DL Subframe End, the Allocation Start Time of the UL-Map
is set to the end of the downlink subframe + "Allocation Start Time" parameter set
below.
When Start Time Base is set to Frame Start, the Allocation Start Time of the UL-Map is
set to the beginning of the frame + "Allocation Start Time" parameter set below.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:COMPressed:AMODe
on page 190
Allocation Start Time OFDMA
Sets the Allocation Start Time in the UL-Map, appended to the DL-Map.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:COMPressed:ATIMe
on page 191
68Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Data Configuration OFDMA
UL-MAP File OFDMA
Access the dialog for selecting the UL-MAP file.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:DLMap:COMPressed:ULMap:
DSELect on page 191
3.16 Data Configuration OFDMA
This dialog provides all parameters to configure the data in OFDMA mode.
The "Data Configuration" dialog is accessed via the "More Param" button in the
OFDMA burst table.
3.16.1 OFDMA Data Configuration Settings
This dialog contains the parameters required to configure the data options in OFDMA
mode.
Provided are the following settings:
69Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Data Configuration OFDMA
DIUC OFDMA
Sets the specific DIUC.
In DL-MAP mode "Auto", the DIUC of each burst is included in the DL-MAP.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DIUC
on page 161
UIUC OFDMA
( available in uplink direction)
Sets the specific UIUC. The UIUC is used for the UL-MAP, if generated.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:UIUC
on page 186
Multiple PDUs OFDMA
Enables/disables configuration of multiple PDUs. If this parameter is enabled, multiple
PDUs each with own MAC header and CRC are available within one burst (see PDU
Table ).
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU:STATe
on page 177
No. Of PDUs OFDMA
Available for enabled parameter Multiple PDUs only
Sets the number of PDUs in the burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU:COUNt
on page 176
MAC CID
The command sets the CID (connection control identifier) of the medium access control layer (MAC). The CID identifies a connection to equivalent peers in the MAC of the
base station and subscriber station.
This parameter is identical to the CID set in the MAC Header settings.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:MAC:CID
on page 174
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
MAC:CID on page 170
Configure MAC
Available for disabled parameter Multiple PDUs only
Accesses the dialog for configuring the MAC header panel for the selected burst (see
MAC Header Configuration OFDMA).
Remote command:
n.a.
70Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Data Configuration OFDMA
Channel Coding Randomizer
Activates or deactivates the randomizer applied before channel coding.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:CCODing:
RANDomizer on page 159
FEC
Activates or deactivates the FEC.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:CCODing:FEC
on page 158
Interleaver
Activates or deactivates the interleaver state.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:CCODing:
INTerleaver on page 158
Repetition Coding
Activates repetition coding by specifying any value other than 0.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:CCODing:
REPCoding on page 159
Space-Time Coding Mode
Selects the space time coding mode for the specified burst.
This parameter is available only, if the "Space-Time Coding Mode" is set to "Burst
Defined".
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:STC:MODE
on page 184
Include In SUB-DL-UL-MAP
Selects whether a DL-MAP IE is included in the specified SUB-DL-UL-MAP message
for this burst.
The default value of this parameter is off. One of the three available SUB-DL-UL-MAPs
can be selected to carry the DL-MAP IE for this burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DLUL:INCLude
on page 163
Ranging Backoff Start
(only for burst type UCD)
71Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Data Configuration OFDMA
Sets the start value for the ranging backoff.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:UCD:RANGing:
BOSTart on page 185
Ranging Backoff End
(only for burst type UCD)
Sets the end value for the ranging backoff.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:UCD:RANGing:
BOENd on page 185
Request Backoff Start
(only for burst type UCD)
Sets the start value for the request backoff.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:UCD:REQuest:
BOSTart on page 186
Request Backoff End
(only for burst type UCD)
Sets the end value for the request backoff.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:UCD:REQuest:
BOENd on page 186
Burst Profile Mapping
(only for burst type UCD and DCD)
Determines whether the burst profile mapping is performed automatically or manually.
In manual configuration, the mapping to the UIUCs/DUICs is user-definable.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PMAP
on page 181
72Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Data Configuration OFDMA
FEC & Modulation Type ← Burst Profile Mapping
(only for burst type UCD and DCD and manual Burst Profile Mapping)
Sets the FEC and the modulation for the selected UIUC/DUIC.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PMAP:
DMODulation<dir0> on page 181
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PMAP:
UMODulation<dir0> on page 181
3.16.2 PDU Table
This dialog contains the parameters required to configure multiple PDU data in
OFDMA mode.
Each burst supports up to 16 PDUs with individual parameters. For each PDU, the
data length, the data source, the CID and the MAC can be individually configured.
Provided are the following settings:
Data Length PDU OFDMA
Available for enabled parameter Multiple PDUs only
Sets the data length for the selected PDU in the burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>:
DLENgth on page 178
Data Source PDU OFDMA
Available for enabled parameter Multiple PDUs only
Sets the PDU data source.
The following standard data sources are available:
●
"All 0, All 1"
An internally generated sequence containing 0 data or 1 data.
●
"PNxx"
An internally generated pseudo-random noise sequence.
●
"Pattern"
An internally generated sequence according to a bit pattern.
Use the "Pattern" box to define the bit pattern.
●
"Data List/Select DList"
73Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
UL-MAP Configuration Downlink OFDMA
A binary data from a data list, internally or externally generated.
Select "Select DList" to access the standard "Select List" dialog.
– Select the "Select Data List > navigate to the list file *.dm_iqd > Select" to
select an existing data list.
– Use the "New" and "Edit" functions to create internally new data list or to edit
an existing one.
– Use the standard "File Manager" function to transfer external data lists to the
instrument.
See also "Main Dialog > Data List Management".
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>:
DATA on page 177
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>:
DATA:DSELect on page 178
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>:
DATA:PATTern on page 178
MAC CID (PDU)
The command sets the CID (Connection Control Identifier) of the medium access control layer (MAC). The CID identifies a connection to equivalent peers in the MAC of the
base station and subscriber station.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>[:
MAC]:CID on page 180
MAC Config… PDU OFDMA
Accesses the dialog for configuring the MAC header panel for the selected PDU.
seePDU MAC Configuration OFDMA.
Remote command:
n.a.
3.17 UL-MAP Configuration Downlink OFDMA
The "UL-MAP" Configuration dialog is accessed via the "More Param" button in the
OFDMA burst table. The DL-MAP is only available in OFDMA downlink mode.
74Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
UL-MAP Configuration Downlink OFDMA
Provided are the following settings:
DIUC OFDMA
Sets the specific DIUC.
In DL-MAP mode "Auto", the DIUC of each burst is included in the DL-MAP.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DIUC
on page 161
MAC CID
The command sets the CID (connection control identifier) of the medium access control layer (MAC). The CID identifies a connection to equivalent peers in the MAC of the
base station and subscriber station.
75Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
UL-MAP Configuration Downlink OFDMA
This parameter is identical to the CID set in the MAC Header settings.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:MAC:CID
on page 174
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
MAC:CID on page 170
Configure MAC
Acesses the dialog for configuring the MAC header panel for the selected burst. (Refer
to chapter 3.23, "MAC Header Configuration OFDMA", on page 90.)
Remote command:
n.a.
Channel Coding Randomizer
Activates or deactivates the randomizer applied before channel coding.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:CCODing:
RANDomizer on page 159
FEC
Activates or deactivates the FEC.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:CCODing:FEC
on page 158
Interleaver
Activates or deactivates the interleaver state.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:CCODing:
INTerleaver on page 158
Repetition Coding
Activates repetition coding by specifying any value other than 0.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:CCODing:
REPCoding on page 159
Include In SUB-DL-UL-MAP
Selects whether a DL-MAP IE is included in the specified SUB-DL-UL-MAP message
for this burst.
The default value of this parameter is off. One of the three available SUB-DL-UL-MAPs
can be selected to carry the DL-MAP IE for this burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DLUL:INCLude
on page 163
76Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
UL-MAP Configuration Downlink OFDMA
Allocation Start Time Base
Selects the Allocation Start Time base. The Allocation Start Time field of the UL-MAP
specifies the start of the uplink subframe.
When Start Time Base is set to DL Subframe End, the Allocation Start Time of the ULMAP is set to the end of the downlink subframe + Allocation Start Time parameter set
below.
When Start Time Base is set to Frame Start, the Allocation Start Time of the UL-MAP
is set to the beginning of the frame + Allocation Start Time parameter set below.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:ULMap:AMODe
on page 187
Allocation Start Time
Sets the Allocation Start Time in the UL-MAP.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:ULMap:ATIMe
on page 187
UL-MAP File
Accesses the dialog for selecting the UL-MAP file.
Remote command:
n.a.
Append DCD OFDMA
If activated, the DCD is appended to the UL-MAP. The DCD message is transmitted
with its own MAC header and CRC, included in the same burst allocation used by the
UL-MAP.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:ULMap:DCD:
STATe on page 188
DCD CID OFDMA
(only if Append DCD is ON)
Enters the value for the DCD CID.
This CID (connection control identifier) is independent from the UL-Map CID and only
used for the DCD.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:ULMap:DCD:
CID on page 187
77Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Generate UL-MAP Uplink OFDMA
Append UCD OFDMA
If activated, the UCD is appended to the UL-MAP. The UCD message is transmitted
with its own MAC header and CRC, included in the same burst allocation used by the
UL-MAP.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:ULMap:UCD:
STATe on page 190
UCD CID OFDMA
(only if Append DCD is ON)
Enters the value for the UCD CID.
This CID (connection control identifier) is independent from the DL-Map CID and only
used for the UCD.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:ULMap:UCD:
CID on page 189
Ranging Backoff Start
Sets the start value for the ranging backoff.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:ULMap:
RANGing:BOSTart on page 188
Ranging Backoff End
Sets the end value for the ranging backoff.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:ULMap:
RANGing:BOENd on page 188
Request Backoff Start
Sets the start value for the request backoff.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:ULMap:
REQuest:BOSTart on page 189
Request Backoff End
Sets the end value for the request backoff.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:ULMap:
REQuest:BOENd on page 189
3.18 Generate UL-MAP Uplink OFDMA
The "Generate UL-MAP" dialog is accessed via the "Generate UL-MAP".. button in the
zone configuration dialog.
78Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Generate UL-MAP Uplink OFDMA
Provided are the following settings:
UCD Count OFDMA
Sets the value for the UCD count.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:UCD on page 196
Save UL-MAP Data OFDMA
Accesses the "File Select" window for saving the current UL-map.
The name of the file is specified in the "File name" entry field, the directory selected in
the "save into" field. The file is saved by pressing the "Save" button.
The file is stored with the predefined file extension *.dm_iqd. The file name and the
directory it is stored in are user-definable.
The saved *.dm_iqd file is in data list format and contains a UL-MAP that describes
the current uplink zone.
The following list shows the parameters the UL-MAP is composed of:
●
UCD Count
Set to UCD Count specified above
●
Allocation Start Time
Set to 0. Can be modified later when loading the UL-MAP in downlink mode
●
No. OFDMA Symbols
Total number of OFDMA symbols in the uplink subframe.
●
CID
CID from the "More Param" panel for each burst
●
UIUC
UIUC from the "More Param" panel for each burst or 12 for ranging.
For ranging bursts:
●
OFDMA Symbol offset
Symbol offset relative to allocation start time
●
Subchannel offset
Lowest subchannel used for ranging allocation
●
No. OFDMA symbols
Symbols in ranging allocation
●
No. Subchannels
Subchannels in ranging allocation
●
Ranging method
Defined by the Opportunity Size in the Ranging panel.
For data bursts:
●
Duration
79Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Ranging Uplink OFDMA
Burst duration in slots
●
Repetition coding indication
Repetition coding from the "More Param" panel for each burst
Generating a valid UL-MAP
The following steps are required to generate a valid UL-MAP:
●
1. Switch to uplink mode
●
2. Define the layout of the uplink zone by setting a number of bursts and specifying
the parameters above for each burst
●
3. Select Generate UL-MAP and save the UL-MAP to a file
●
4. Switch to downlink mode
●
5. Set one of the downlink bursts to Burst Type UL-MAP
●
6. Open the More Param panel
●
7. Select UL-MAP File and load the file created before.
The downlink zone is then transmitting a UL-MAP that specifies the uplink structure
defined in uplink mode before.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:ULMap:CREate on page 197
3.19 Ranging Uplink OFDMA
Burst type Ranging offers ranging allocations which can be used for initial / periodic
ranging or bandwidth request transmissions. For each ranging / bandwidth request
slot, 8 bits are read from the data source. These 8 bits select the used code. The
codes are numbered from 0 to 255. For opportunity size 4, 8 bits are read once per
slot. The first code is specified by the 8 bits and the second consecutive code is the
first code advanced by one. For opportunity size 3, the same method is applied. The
second code is the first code + 1, the third code is the first code + 2.
The "Ranging" dialog is accessed via the "More Param" button in the OFDMA burst
table in uplink mode. It contains the parameters required to configure the ranging
options in OFDMA mode.
Provided are the following settings:
80Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
HARQ Configuration OFDMA
Opportunity Size
Sets the ranging opportunity size. The opportunity size specifies the number of symbols required to transmit one CDMA ranging code.
For initial ranging transmissions, values of 2 or 4 are used. With opportunity size 2, one
CDMA code is transmitted in two symbols. With opportunity size 4, two consecutive
ranging codes are transmitted in four symbols.
For periodic ranging and bandwidth request transmissions, values of 1 or 3 are used.
With opportunity size 1, one CDMA code is transmitted in one symbol. With opportunity
size 3, three consecutive ranging codes are transmitted in three symbols.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:RANGing:
OPPortunity:SIZE on page 183
No. Of Opportunity Slots
The number of opportunity slots defines the length of the ranging allocation:
Length of Ranging Allocation = OpportunitySize * NoOfOpportunitySlots OFDMA symbols.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:RANGing:
OPPortunity:SLOTcount on page 183
No. Of Subchannel Groups
Sets the number of subchannel groups used in the ranging allocation. In PUSC mode,
6 subchannels form one subchannel group.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:RANGing:
SCGCount on page 183
No. Of Allocated Codes
Displays the number of allocated codes. The number of codes is "NoOfOpportunitySlots" * "NoOfSubchannelGroups".
Consecutive codes of opportunity sizes 3 and 4 are not taken into account.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:RANGing:
ACODe? on page 182
3.20 HARQ Configuration OFDMA
This dialog provides all parameters to configure the HARQ options in OFDMA mode.
The selected HARQ mode determines the parameters available in the HARQ-sub burst
table.
The "HARQ Configuration" dialog is accessed via the "More Param" button in the
OFDMA burst table. HARQ bursts are only available with CTC channel coding.
81Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
HARQ Configuration OFDMA
3.20.1 OFDMA HARQ Settings
Provided are the following settings:
HARQ Mode
Selects the mode of the HARQ burst.
"Chase"
Selects Chase Combining HARQ. For each sub-burst, only one version of the packet is generated.
"IR"
Selects Incremental Redundancy HARQ. For each sub-burst, several
versions of encoded sub-packets can be generated. They are identified by a sub-packet ID (SPID).
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ:MODE
on page 165
No. Of Sub-Bursts
Sets the number of sub-bursts in the HARQ bust. Each HARQ burst allocated in the
Zone Configuration panel can be divided into up to 15 sub-bursts. The length of each
sub-burst is set by the "Duration [Slots]" parameter.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ:COUNt
on page 165
Moving Start Offset Mode
(for HARQ Mode Chase only)
Enables/disables moving of start offset mode.
If enabled, the subburst structure resembles the specified structure required for MRCT
Test 9.1.24.4, according to "WiMAX ForumTM Mobile Radio Conformance Test".
82Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
HARQ Configuration OFDMA
To use this mode according to the WiMAX MRCT specification, perform following configuration:
●
1. Configure exactly 3 HARQ subbursts.
The first and third subbursts are dummy bursts with QPSK modulation.
The second subburst is the desired subburst (with usually 2 FEC blocks).
●
2. Configure the length of the first subburst such that it fills at least the first 4 symbols (e.g. 64 slots in 1024 FFT mode).
This burst can be slightly longer than the slots available in the first 4 symbols.
●
3. Configure the second subburst to the desired length
●
4. Configure the length of the third subburst such that it fills the remaining space.
●
5. Enable Moving Start Offset Mode
●
6. Select a desired number of frames (longer than 1 frame).
●
Result:
The Signal Generator automatically modifies the length of the first and third subbursts such that the second one moves it's start position with every frame according to the MRCT requirement (mod(frame_index, N_subch)).
The dummy bursts will be automatically cut off or enlarged as required.
The DL-MAP is updated with every frame to reflect the changed conditions.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ:
MSTart[:STATe] on page 166
83Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
HARQ Configuration OFDMA
No. Of Slots Available In Burst
Displays the remaining number of slots available for the burst. The number of slots is
defined in the zone configuration panel with "No. of Subch" and "No. of Symb" in the
downlink and "Duration [Slots]" in the uplink.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ:SLFRee?
on page 166
Include In SUB-DL-UL-MAP
Selects whether a DL-MAP IE is included in the specified SUB-DL-UL-MAP message
for this burst.
The default value of this parameter is off. One of the three available SUB-DL-UL-MAPs
can be selected to carry the DL-MAP IE for this burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DLUL:INCLude
on page 163
3.20.2 HARQ Sub-burst Table
The parameters in the HARQ sub-burst table depend on the selected HARQ mode.
●
HARQ Chase Mode
●
HARQ IR Mode
Sub-Burst Index
Displays the consecutive sub-burst index from 0 to 14.
All the rows are always displayed, even if the sub-bursts are inactive. They are
switched on and off by the selection of No. of Sub-Bursts above the table. The active
sub-bursts are highlighted.
Remote command:
n.a.
Modulation & Coding Rate
(for HARQ Chase Mode only)
84Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
HARQ Configuration OFDMA
Sets the sub-burst modulation and coding rate.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
MODRate on page 172
Packet Size [Bits]
(for HARQ IR Mode only)
Sets the HARQ sub-burst packet size (in bits).
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
PSIZe on page 172
Duration [Slots]
Sets the duration of the sub-bursts in slots. The duration range is dynamic and
depends on the selected link direction and packet size.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
SLOTcount on page 173
Modulation
(for HARQ IR Mode only)
Displays the sub-burst modulation.
The modulation is determined by the parameters "Packet Size" and "Duration" and
cannot be altered directly.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
FORMat? on page 170
Rate
(for HARQ IR Mode only)
Displays the sub-burst code rate. The code rate is determined by the parameters
"Packet Size" and "Duration" and cannot be altered directly
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
RATE? on page 173
Data Length
Sets the data length of the sub-burst. The data length range is dynamic and depends
on the packet size and the MAC header state.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
DLENgth on page 169
Data Source
Selects data source for the selected sub-bursts.
85Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
HARQ Configuration OFDMA
The following standard data sources are available:
●
"All 0, All 1"
An internally generated sequence containing 0 data or 1 data.
●
"PNxx"
An internally generated pseudo-random noise sequence.
●
"Pattern"
An internally generated sequence according to a bit pattern.
Use the "Pattern" box to define the bit pattern.
●
"Data List/Select DList"
A binary data from a data list, internally or externally generated.
Select "Select DList" to access the standard "Select List" dialog.
– Select the "Select Data List > navigate to the list file *.dm_iqd > Select" to
select an existing data list.
– Use the "New" and "Edit" functions to create internally new data list or to edit
an existing one.
– Use the standard "File Manager" function to transfer external data lists to the
instrument.
See also "Main Dialog > Data List Management".
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
DATA on page 167
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
DATA:PATTern on page 169
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
DATA:DSELect on page 168
DIUC
(for HARQ Chase Mode only)
Sets the DIUC (Downlink Interval User Code) for the specified sub-burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
DIUC on page 169
MAC CID
The command sets the CID (connection control identifier) of the medium access control layer (MAC). The CID identifies a connection to equivalent peers in the MAC of the
base station and subscriber station.
This parameter is identical to the CID set in the MAC Header settings.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:MAC:CID
on page 174
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
MAC:CID on page 170
86Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Fast Feedback Configuration OFDMA
ACID
Sets the HARQ channel identifier for the specified sub-burst.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
ACID on page 167
SPID Sequence
(for HARQ IR Mode only)
Sets the sub-packet ID sequence which is used to select the generated sub-packet out
of the four possible sub-packets for each frame. Each SPID is identified by a number
from 0 to 3. Up to 8 numbers can be entered, separated by colons.
During signal generation, one SPID out of the sequence is used to generate the
encoder packet for each frame. The index in the SPID sequence is advanced frame by
frame and starts again from the beginning after all entered numbers have been used.
Example:
SPID sequence: 0,1,2
Sequence Length set in the main panel: 10 frames.
The following sequence is output:
0,1,2,0,1,2,0,1,2,0
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
SPID on page 173
ACK Disable
Disables ACK, i.e. the allocated subburst does not require an ACK to be transmitted .
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
ACKD on page 167
MAC
Accesses the dialog for configuring the generic MAC (Media Access Control) header of
the selected sub-burst and for activating the checksum determination.
Remote command:
n.a.
3.21 Fast Feedback Configuration OFDMA
The "Fast Feedback Configuration" dialog is accessed via the More "Param button" in
the OFDMA burst table.
87Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Fast Feedback Configuration OFDMA
Provided are the following settings:
Fast Feedback Mode
Selects the fast feedback mode.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:FFB:MODE
on page 164
Codeword Size
Displays the codeword size. The codeword size depends on the selected "Fast Feedback Mode". In Normal mode, 4 bits are read out of the data source and are mapped to
one fast feedback slot. In Enhanced mode, 6 bits are mapped to one slot.
The Enhanced (MIMO) and ACK modes use two codewords per slot. In Enhanced
(MIMO) mode, two times 3 bits are read out of the data source and are mapped to one
slot. The first 3 bits are mapped to tiles 0, 2, and 4; the second 3 bits are mapped to
tile 1, 3, and 5. For the ACK mode, the procedure is similar. Here, the first bit is mapped to the first half slot and the second bit is mapped to the second half slot.
The data source is read out continuously over the configured frames, MSB first. If the
length of the data source is smaller than the number of bits required by codeword size,
number of slots in the allocation and configured sequence length, reading the data
source is restarted from the beginning.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:FFB:CWSize?
on page 164
No. Of Subchannels
Sets the number of subchannels. The number of slots in the fast feedback allocation is
subchannels * symbols / 3.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:FFB:SUBC
on page 164
No. Of Symbols
Sets the number of symbols. The number of slots in the fast feedback allocation is subchannels * symbols / 3.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:FFB:SYMB
on page 164
88Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
SUB-DL-UL-MAP Configuration OFDMA
3.22 SUB-DL-UL-MAP Configuration OFDMA
The "SUB-DL-UL-MAP Configuration" dialog is accessed via the "More Param" button
in the OFDMA burst table.
Provided are the following settings:
SUB-DL-UL-MAP Index
Displays the number of the SUB-DL-UL-MAP message.
Altogether up to three SUB-DL-UL-MAP messages can be enabled for all zones. The
"SUB-DL-UL-MAP Index" is a consecutive number that is assigned for each configured
SUB-DL-UL-MAP message.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DLUL:MPIX?
on page 163
DIUC OFDMA
Sets the specific DIUC.
In DL-MAP mode "Auto", the DIUC of each burst is included in the DL-MAP.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DIUC
on page 161
HARQ ACK Offset Indicator
Enables/disables the inclusion of HARQ offsets.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DLUL:HARQ:
ACKoffset:INDicator on page 162
DL HARQ ACK Offset
Sets the ACK channel that corresponds to the first HARQ-enabled DL burst specified
in this map message.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DLUL:HARQ:
ACKoffset:DL on page 162
89Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
MAC Header Configuration OFDMA
UL HARQ ACK Offset ← DL HARQ ACK Offset
Sets the ACK bit index in the DL HARQ ACK that corresponds to the first HARQenabled UL burst specified in this map message.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DLUL:HARQ:
ACKoffset:UL on page 163
ACK Region Index
Selects whether ACK region 0 or 1 will be used.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:DLUL:ARIX
on page 162
3.23 MAC Header Configuration OFDMA
The "MAC" dialog is accessed via the "Configure MAC ..." button located in the "More
Param" panel.
This dialog is also used to configure the generich MAC header for HARQ. The"HARQ
MAC" dialog is reached via the "Config"... button located in the sub-burst table (see
chapter 3.20, "HARQ Configuration OFDMA", on page 81).
This dialog provides settings for a generic MAC header of the corresponding zone and
burst. The MAC header is placed at the beginning of the burst when activated.
In addition CRC (Cyclic Redundancy Check) can be activated, which is added at the
end of the burst. It covers MAC header and all data.
90Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
MAC Header Configuration OFDMA
CRC State
Activates/deactivates the checksum determination. The state of the CRC can be set
independently of the state of MAC header generation.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:MAC:CRC:
STATe on page 174
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
MAC:CRC:STATe on page 170
MAC Header State
Activates the generation of the generic MAC header.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:MAC:STATe
on page 175
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
MAC:STATe on page 171
MAC CID
The command sets the CID (connection control identifier) of the medium access control layer (MAC). The CID identifies a connection to equivalent peers in the MAC of the
base station and subscriber station.
91Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
PDU MAC Configuration OFDMA
This parameter is identical to the CID set in the MAC Header settings.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:MAC:CID
on page 174
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
MAC:CID on page 170
Payload encrypted
Activates/deactivates payload encryption.
If activated, the EC (Encryption Control) field is set to 1 and the EKS (Encryption Key
Sequence) field can be set.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:MAC:
ENCRypted:STATe on page 174
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
MAC:ENCRypted:STATe on page 171
EKS
Sets the EKS (Encryption Key Sequence) value in the MAC header. The payload
encryption itself is not performed by the signal generator.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:MAC:EKS
on page 174
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
MAC:EKS on page 171
Mac Type
Specifies the MAC type.
The value of the 6-bit type field is set which indicates the payload type, including the
presence of subheaders.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:MAC:TYPE
on page 175
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:HARQ<dir0>:
MAC:TYPE on page 172
3.24 PDU MAC Configuration OFDMA
The "PDU MAC" dialog is reached via the "Configure MAC" button located in the "PDU
Table".
This dialog provides settings for the generic PDU MAC header of the corresponding
zone, burst and PDU combination. The MAC header is placed at the beginning of the
PDU when activated.
92Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
PDU MAC Configuration OFDMA
In addition CRC (Cyclic Redundancy Check) can be activated, which is added at the
end of the PDU. It covers MAC header and all data.
Provided are the following settings:
CRC State (PDU)
Activates/deactivates the checksum determination. The state of the CRC can be set
independently of the state of MAC header generation.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>:
MAC:CRC:STATe on page 179
MAC Header State (PDU)
Activates the generation of the generic MAC header.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>:
MAC:STATe on page 180
MAC CID (PDU)
The command sets the CID (Connection Control Identifier) of the medium access control layer (MAC). The CID identifies a connection to equivalent peers in the MAC of the
base station and subscriber station.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>[:
MAC]:CID on page 180
93Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
PDU MAC Configuration OFDMA
Payload encrypted (PDU)
Activates/deactivates payload encryption.
If activated, the EC (Encryption Control) field is set to 1 and the EKS (Encryption Key
Sequence) field can be set.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>:
MAC:ENCRypted:STATe on page 179
EKS (PDU)
Sets the EKS (Encryption Key Sequence) value in the MAC header. The payload
encryption itself is not performed by the signal generator.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>:
MAC:EKS on page 179
Mac Type (PDU)
Specifies the MAC type.
The value of the 6-bit type field is set which indicates the payload type, including the
presence of subheaders.
Remote command:
[:SOURce<hw>]:BB:WIMax:AOFDm[:ZONE<st0>]:BURSt<ch0>:PDU<dir0>:
MAC:TYPE on page 180
94Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Filter / Clipping Settings
3.25 Filter / Clipping Settings
► To access this dialog, select "Main dialog > Filter/Clipping Settings".
The dialog contains the settings required to configure the baseband filter and to
enable clipping.
3.25.1 Filter Settings
Provided are the following settings:
Filter
Selects the baseband filter.
Remote command:
[:SOURce<hw>]:BB:WIMax:FILTer:TYPE on page 120
Roll Off Factor or BxT
Sets the filter parameter.
The filter parameter offered ("Roll Off Factor" or "BxT") depends on the currently
selected filter type. This parameter is preset to the default for each of the predefined
filters.
95Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Filter / Clipping Settings
Fig. 3-1: Example of the frequency response of a filter with different Roll Off Factors
For the default cosine filter a roll off factor of 0.07 is used.
Remote command:
[:SOURce<hw>]:BB:WIMax:FILTer:PARameter:APCO25 on page 120
[:SOURce<hw>]:BB:WIMax:FILTer:PARameter:COSine on page 120
[:SOURce<hw>]:BB:WIMax:FILTer:PARameter:GAUSs on page 121
[:SOURce<hw>]:BB:WIMax:FILTer:PARameter:PGAuss on page 122
[:SOURce<hw>]:BB:WIMax:FILTer:PARameter:RCOSine on page 122
[:SOURce<hw>]:BB:WIMax:FILTer:PARameter:SPHase on page 123
Cut Off Frequency Shift
(available for filter parameter Cosine only)
The cut off frequency is a filter characteristic that defines the frequency at the 3 dB
down point. The "Cut Off Frequency Shift" affects this frequency in the way that the filter flanks are "moved" and the transition band increases by "Cut Off Frequency
Shift"*"Sample Rate".
●
A "Cut Off Frequency Shift" = -1 results in a very narrow-band filter
●
Increasing the value up to 1 makes the filter more broad-band
●
By "Cut Off Frequency Shift" = 0, the -3 dB point is at the frequency determined by
the half of the selected "Sample Rate".
Tip: Use this parameter to adjust the cut off frequency and reach spectrum mask
requirements.
96Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Filter / Clipping Settings
Fig. 3-2: Example of the frequency response of a filter with different Cut Off Frequency Shift
Remote command:
[:SOURce<hw>]:BB:WIMax:FILTer:PARameter:COSine:COFS on page 121
Cut Off Frequency Factor
Sets the value for the cut off frequency factor. The cut off frequency of the filter can be
adjusted to reach spectrum mask requirements.
Remote command:
[:SOURce<hw>]:BB:WIMax:FILTer:PARameter:LPASs on page 121
[:SOURce<hw>]:BB:WIMax:FILTer:PARameter:LPASSEVM on page 122
Filter Mode
Selects whether to apply the filter in real time mode or offline mode.
"Realtime"
"Offline"
The filter is applied to the signal in real-time mode.
The filter is applied to the signal in offline mode.
This option increases the calculation time and reduces the maximum
number of generated frames that can be fit into the ARB memory. It
can be useful to filter the signal in offline mode if steeper filter edges
are required. In offline mode, more taps are used for the filters; therefore the roll of factor can be further decreased.
Remote command:
[:SOURce<hw>]:BB:WIMax:FILTer:MODE on page 120
Sample Rate Variation
Sets the sample rate of the signal.
A variation of this parameter only affects the ARB clock rate; all other signal parameters remain unchanged. If the sampling rate in the frame configuration dialog is
changed, this parameter is reset to the chosen sampling rate.
Remote command:
[:SOURce<hw>]:BB:WIMax:SRATe:VARiation on page 123
97Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Filter / Clipping Settings
3.25.2 Clipping Settings
Provided are the following settings:
Clipping State
Switches baseband clipping on and off.
Baseband clipping is a very simple and effective way of reducing the crest factor of the
signal. Since clipping is done prior to filtering, the procedure does not influence the
spectrum. The EVM however increases.
Remote command:
[:SOURce<hw>]:BB:WIMax:CLIPping:STATe on page 119
Clipping Level
Sets the limit for clipping.
This value indicates at what point the signal is clipped. It is specified as a percentage,
relative to the highest level. 100% indicates that clipping does not take place.
Remote command:
[:SOURce<hw>]:BB:WIMax:CLIPping:LEVel on page 118
Clipping Mode
Selects the clipping method. A graphic illustration of the way in which these two methods work is given in the dialog.
"Vector | i + q
|"
The limit is related to the amplitude | i + q |. The I and Q components
are mapped together, the angle is retained.
"Scalar | i | + |
q |"
Remote command:
[:SOURce<hw>]:BB:WIMax:CLIPping:MODE on page 119
3.25.3 Data Dump
Provided are the following settings:
Dump Input Data for Bursts to Files
Activates burst input data dump.
The limit is related to the absolute maximum of all the I and Q values |
i | + | q | .
The I and Q components are mapped separately, the angle changes.
98Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Trigger/Marker/Clock Settings
The data that is fed into the channel coding of each burst is output to files named
data_frameXXXX_zoneY_burstZZ.dat, where XXXX specifies the frame number,
Y the zone index and ZZ the burst index. The files contain all data including MAC
header and CRC in ASCII hex format, MSB left. Read the files from left to right.
Remote command:
[:SOURce<hw>]:BB:WIMax:BDUMp:STATe on page 118
Output directory for Dump Files
Defines the directory the instrument stores the dumped burst data files in.
If the field is empty, the firmware directory is used (such
as ..\Program Files\Rohde&Schwarz\SMx\Firmware).
Remote command:
[:SOURce<hw>]:BB:WIMax:BDUMp:DIRectory on page 118
3.26 Trigger/Marker/Clock Settings
The trigger, clock, and marker delay functions are available for R&S SMx and R&S
AMU instruments only.
To access this dialog, select "Main dialog > Trigger/Marker".
The "Trigger In" section is where the trigger for the signal is set. Various parameters
will be provided for the settings, depending on which trigger source - internal or external - is selected. The current status of signal generation ("Running" or "Stopped") is
indicated for all trigger modes.
The "Marker Mode" section is where the marker signals at the MARKER output connectors are configured.
The "Marker Delay" section is where a marker signal delay can be defined, either without restriction or restricted to the dynamic section, i.e., the section in which it is possible to make settings without restarting signal and marker generation.
99Operating Manual 1171.5277.12 ─ 16
WiMAX User InterfaceIEEE 802.16 WiMAX
Trigger/Marker/Clock Settings
The "Clock Settings" section is where the clock source is selected and - in the case of
an external source - the clock type.
The buttons in the last section lead to subdialog for general trigger, clock and mapping
settings.
3.26.1 Trigger In
The trigger functions are available for R&S SMx and R&S AMU instruments only.
The "Trigger In" section is where the trigger for the signal is set. Various parameters
will be provided for the settings, depending on which trigger source - internal or external - is selected. The current status of signal generation ("Running" or "Stopped") is
indicated for all trigger modes.
Trigger Mode
Selects trigger mode, i.e. determines the effect of a trigger event on the signal generation.
●
"Auto"
The signal is generated continuously.
●
"Retrigger"
The signal is generated continuously. A trigger event (internal or external) causes a
restart.
●
"Armed_Auto"
100Operating Manual 1171.5277.12 ─ 16
Loading...