Page 1
R&S® FSV-K93
Firmware Option WiMAX, WiBro
Measurements
Operating Manual
(;ÚÚÅ2)
1176.7655.02 ─ 03.1
Operating Manual
Test & Measurement
Page 2
This manual describes the following options:
R&S FSV-K93 (1310.8955.02)
The contents of this manual correspond to the following R&S®FSVR models with firmware version 2.23 or
higher:
●
R&S®FSVR7 (1311.0006K7)
●
R&S®FSVR13 (1311.0006K13)
●
R&S®FSVR30 (1311.0006K30)
●
R&S®FSVR40 (1311.0006K40)
The software contained in this product makes use of several valuable open source software packages. For information, see the
"Open Source Acknowledgement" on the user documentation CD-ROM (included in delivery).
Rohde & Schwarz would like to thank the open source community for their valuable contribution to embedded computing.
© 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.
Trade names are trademarks of the owners.
The following abbreviations are used throughout this manual: R&S®FSV is abbreviated as R&S FSV. R&S®FSVR is abbreviated as
R&S FSVR.
Page 3
R&S® FSV-K93
1 Preface.................................................................................................... 5
1.1 Documentation Overview............................................................................................. 5
1.2 Conventions Used in the Documentation...................................................................7
1.3 How to Use the Help System........................................................................................8
2 Introduction.......................................................................................... 10
3 WiMAX, WiBro Measurements (R&S FSV-K93)................................. 11
3.1 Basic Measurement Examples...................................................................................12
3.2 Signal Processing of the IEEE 802.16-2004 OFDM measurement application......15
3.3 Signal Processing of the IEEE802.16-2005 OFDMA/WiBro Measurement Applica-
Contents
Contents
tion................................................................................................................................27
4 Instrument Functions WiMAX, WiBro Measurements (R&S FSV-
K93)....................................................................................................... 35
4.1 Menu and Softkey Description...................................................................................36
4.2 Further Information.....................................................................................................36
4.3 Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)............................................. 45
4.4 Softkeys of the Sweep Menu – SWEEP Key (R&S FSV-K93)................................ 105
4.5 Softkeys of the Marker Menu – MKR Key (R&S FSV-K93).....................................106
4.6 Softkeys of the Marker to Menu – MKR-> Key (R&S FSV-K93)............................. 107
4.7 Softkeys of the Lines Menu – LINES Key (R&S FSV-K93).....................................108
4.8 Softkeys of the Trace Menu – TRAC Key (R&S FSV-K93)..................................... 108
4.9 Softkeys of the Input/Output Menu for WiMAX Measurements............................ 109
5 Remote Commands of the WiMAX/WiBro Measurements (R&S FSV-
K93)..................................................................................................... 112
5.1 Notation......................................................................................................................114
5.2 ASCII Formats for Returned Values........................................................................ 116
5.3 ABORt subsystem.....................................................................................................118
5.4 CALCulate:BURSt Subsystem (WiMAX/WiBro, K93)............................................. 118
5.5 CALCulate:LIMit Subsystem (WiMAX/WiBro, K93)................................................ 119
5.6 CALCulate:MARKer Subsystem (WiMAX / WiBro, K93)........................................ 137
5.7 CONFigure Subsystem (WiMAX / WiBro, K93)....................................................... 148
5.8 DISPlay Subsystem (WiMAX / WiBro, K93).............................................................181
3Operating Manual 1176.7655.02 ─ 03.1
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R&S® FSV-K93
5.9 FETCh Subsystem (WiMAX / WiBro, K93).............................................................. 187
5.10 FORMat Subsystem (WiMAX / WiBro, K93)............................................................ 197
5.11 INITiate Subsystem (WiMAX / WiBro, K93)............................................................. 198
5.12 INPut subsystem....................................................................................................... 199
5.13 INSTrument Subsystem (WiMAX / WiBro, K93)......................................................202
5.14 MMEMory Subsystem (WiMAX / WiBro, K93)......................................................... 203
5.15 SENSe Subsystem (WiMAX / WiBro, K93).............................................................. 204
5.16 STATus Subsystem (OFDMA/WiBro, K93)..............................................................225
5.17 SYSTEM Subsystem (WiMAX, K93).........................................................................228
5.18 TRACe Subsystem (WiMAX, K93)............................................................................228
5.19 TRIGger Subsystem (WiMAX, K93)......................................................................... 238
5.20 UNIT Subsystem (WiMAX, K93)............................................................................... 241
5.21 Status Reporting System (Option R&S FSV-K93).................................................. 243
Contents
List of Commands..............................................................................249
Index....................................................................................................256
4Operating Manual 1176.7655.02 ─ 03.1
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R&S® FSV-K93
1 Preface
Preface
Documentation Overview
1.1 Documentation Overview
The user documentation for the R&S FSVR is divided as follows:
●
Quick Start Guide
●
Operating Manuals for base unit and options
●
Service Manual
●
Online Help
●
Release Notes
Quick Start Guide
This manual is delivered with the instrument in printed form and in PDF format on the
CD. It provides the information needed to set up and start working with the instrument.
Basic operations and basic measurements are described. Also a brief introduction to
remote control is given. The manual includes general information (e.g. Safety Instructions) and the following chapters:
Chapter 1 Introduction, General information
Chapter 2 Front and Rear Panel
Chapter 3 Preparing for Use
Chapter 4 Firmware Update and Installation of Firmware Options
Chapter 5 Basic Operations
Chapter 6 Basic Measurement Examples
Chapter 7 Brief Introduction to Remote Control
Appendix Printer Interface
Appendix LAN Interface
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.
The Operating Manual for the base unit provides basic information on operating the
R&S FSVR in general, and the "Spectrum" mode in particular. Furthermore, the software options that enhance the basic functionality for various measurement modes are
described here. The set of measurement examples in the Quick Start Guide is expanded by more advanced measurement examples. In addition to the brief introduction to
remote control in the Quick Start Guide, a description of the basic analyzer commands
and programming examples is given. Information on maintenance, instrument interfaces and error messages is also provided.
5Operating Manual 1176.7655.02 ─ 03.1
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R&S® FSV-K93
Preface
Documentation Overview
In the individual option manuals, the specific instrument 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 FSVR is not included in the
option manuals.
The following Operating Manuals are available for the R&S FSVR:
●
R&S FSVR base unit; in addition:
– R&S FSV-K7S Stereo FM Measurements
– R&S FSV-K9 Power Sensor Support
– R&S FSV-K14 Spectrogram Measurement
●
R&S FSV-K10 GSM/EDGE Measurement
●
R&S FSV-K30 Noise Figure Measurement
●
R&S FSV-K40 Phase Noise Measurement
●
R&S FSV-K70 Vector Signal Analysis Operating Manual
R&S FSV-K70 Vector Signal Analysis Getting Started (First measurements)
●
R&S FSV-K72 3GPP FDD BTS Analysis
●
R&S FSV-K73 3GPP FDD UE Analysis
●
R&S FSV-K76/77 3GPP TD-SCDMA BTS/UE Measurement
●
R&S FSV-K82/83 CDMA2000 BTS/MS Analysis
●
R&S FSV-K84/85 1xEV-DO BTS/MS Analysis
●
R&S FSV-K91 WLAN IEEE 802.11
●
R&S FSV-K93 WiMAX IEEE 802.16 OFDM/OFDMA Analysis
●
R&S FSV-K100/K104 EUTRA / LTE Downlink Measurement Application
●
R&S FSV-K101/K105 EUTRA / LTE Uplink Measurement Application
These manuals are available in PDF format on the CD delivered with the instrument.
Service Manual
This manual is available in PDF format on the CD delivered with the instrument. It
describes how to check compliance with rated specifications, instrument function,
repair, troubleshooting and fault elimination. It contains all information required for
repairing the R&S FSVR by replacing modules. The manual includes the following
chapters:
Chapter 1 Performance Test
Chapter 2 Adjustment
Chapter 3 Repair
Chapter 4 Software Update / Installing Options
Chapter 5 Documents
Online Help
The online help contains context-specific help on operating the R&S FSVR and all
available options. It describes both manual and remote operation. The online help is
6Operating Manual 1176.7655.02 ─ 03.1
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R&S® FSV-K93
Preface
Conventions Used in the Documentation
installed on the R&S FSVR by default, and is also available as an executable .chm file
on the CD delivered with the instrument.
Release Notes
The release notes describe the installation of the firmware, 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.
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.
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-
All names of graphical user interface elements on the screen, such as
dialog boxes, menus, options, buttons, and softkeys are enclosed by
quotation marks.
File names, commands, coding samples and screen output are distinguished by their font.
tion marks.
1.2.2 Conventions for Procedure Descriptions
When describing how to operate the instrument, several alternative methods may be
available to perform the same task. In this case, the procedure using the touchscreen
is described. Any elements that can be activated by touching can also be clicked using
an additionally connected mouse. The alternative procedure using the keys on the
instrument or the on-screen keyboard is only described if it deviates from the standard
operating procedures.
The term "select" may refer to any of the described methods, i.e. using a finger on the
touchscreen, a mouse pointer in the display, or a key on the instrument or on a keyboard.
7Operating Manual 1176.7655.02 ─ 03.1
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R&S® FSV-K93
Preface
How to Use the Help System
1.2.3 Notes on Screenshots
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 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.
1.3 How to Use the Help System
Calling context-sensitive and general help
► To display the general help dialog box, press the HELP key on the front panel.
The help dialog box "View" tab is displayed. A topic containing information about
the current menu or the currently opened dialog box and its function is displayed.
For standard Windows dialog boxes (e.g. File Properties, Print dialog etc.), no contextsensitive help is available.
► If the help is already displayed, press the softkey for which you want to display
help.
A topic containing information about the softkey and its function is displayed.
If a softkey opens a submenu and you press the softkey a second time, the submenu
of the softkey is displayed.
Contents of the help dialog box
The help dialog box contains four tabs:
●
"Contents" - contains a table of help contents
●
"View" - contains a specific help topic
●
"Index" - contains index entries to search for help topics
●
"Zoom" - contains zoom functions for the help display
To change between these tabs, press the tab on the touchscreen.
Navigating in the table of contents
●
To move through the displayed contents entries, use the UP ARROW and DOWN
ARROW keys. Entries that contain further entries are marked with a plus sign.
●
To display a help topic, press the ENTER key. The "View" tab with the corresponding help topic is displayed.
8Operating Manual 1176.7655.02 ─ 03.1
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R&S® FSV-K93
Preface
How to Use the Help System
●
To change to the next tab, press the tab on the touchscreen.
Navigating in the help topics
●
To scroll through a page, use the rotary knob or the UP ARROW and DOWN
ARROW keys.
●
To jump to the linked topic, press the link text on the touchscreen.
Searching for a topic
1. Change to the "Index" tab.
2. Enter the first characters of the topic you are interested in. The entries starting with
these characters are displayed.
3. Change the focus by pressing the ENTER key.
4. Select the suitable keyword by using the UP ARROW or DOWN ARROW keys or
the rotary knob.
5. Press the ENTER key to display the help topic.
The "View" tab with the corresponding help topic is displayed.
Changing the zoom
1. Change to the "Zoom" tab.
2. Set the zoom using the rotary knob. Four settings are available: 1-4. The smallest
size is selected by number 1, the largest size is selected by number 4.
Closing the help window
► Press the ESC key or a function key on the front panel.
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R&S® FSV-K93
2 Introduction
Introduction
This document contains all information required for operation of an R&S FSVR equipped with Application Firmware R&S FSV-K93. It covers operation via menus and the
remote control commands for WiMAX, WiBro measurements.
This option is not available for R&S FSVR 40 model 1307.9002K39.
This document consists of the following chapters:
●
chapter 3.1, "Basic Measurement Examples", on page 12
Describes the measurement setup for WiMAX, WiBro measurements.
●
chapter 4, "Instrument Functions WiMAX, WiBro Measurements (R&S FSV-K93)",
on page 35
Describes the overall instrument functions and provides further information.
●
chapter 4.3, "Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)", on page 45
Shows all softkeys available in the "WiMAX, WiBro" menu. This chapter also refers
to the remote control commands associated with each softkey function.
●
chapter 5, "Remote Commands of the WiMAX/WiBro Measurements (R&S FSVK93)", on page 112
Describes all remote control commands defined for the WiMAX, WiBro measurement.
This document includes only functions of the Application Firmware R&S FSV-K93. For
all other descriptions, please refer to the description of the base unit.
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R&S® FSV-K93
3 WiMAX, WiBro Measurements (R&S FSV-
WiMAX, WiBro Measurements (R&S FSV-K93)
K93)
The R&S FSV-K93 application extends the functionality of the R&S FSVR Signal and
Spectrum analyzer to enable WiMAX and WiBro TX-measurements according to the
following standards:
●
IEEE 802.16-2004/Cor 1-2005 OFDM physical layer mode.
The short form 'IEEE 802.16-2004 OFDM' is used in this document, to reference
this standard.
●
IEEE 802.16-2004/Cor 1-2005, IEEE 802.16e-2005 OFDMA physical layer mode.
The short form 'IEEE 802.16e-2005 OFDMA' is used in this document, to reference
this standard.
●
IEEE 802.16-2004/Cor 1-2005, IEEE 802.16e-2005 based WiBro.
The short form 'WiBro' is used in this document, to reference this standard.
The following measurements are described in this section:
3.1 Basic Measurement Examples...................................................................................12
3.1.1 Setting Up the Measurement........................................................................................ 12
3.1.2 Performing the Level Detection.....................................................................................14
3.1.3 Performing the Main Measurement...............................................................................15
3.2 Signal Processing of the IEEE 802.16-2004 OFDM measurement application......15
3.2.1 Understanding Signal Processing of the IEEE 802.16-2004 OFDM Measurement Appli-
cation.............................................................................................................................16
3.2.2 Analysis Steps...............................................................................................................21
3.2.3 Subchannelization.........................................................................................................22
3.2.4 Synchronization.............................................................................................................22
3.2.5 Channel Results............................................................................................................22
3.2.6 Frequency and Clock Offset..........................................................................................23
3.2.7 EVM.............................................................................................................................. 24
3.2.8 IQ Impairments..............................................................................................................24
3.2.9 RSSI..............................................................................................................................25
3.2.10 CINR............................................................................................................................. 26
3.2.11 OFDM Literature........................................................................................................... 26
3.3 Signal Processing of the IEEE802.16-2005 OFDMA/WiBro Measurement Applica-
tion................................................................................................................................27
3.3.1 Signal Processing Block Diagram.................................................................................29
3.3.2 Synchronisation.............................................................................................................30
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R&S® FSV-K93
3.3.3 Channel Estimation/Equalization.................................................................................. 31
3.3.4 Analysis.........................................................................................................................31
3.3.5 OFDMA/WiBro Literature.............................................................................................. 34
WiMAX, WiBro Measurements (R&S FSV-K93)
Basic Measurement Examples
3.1 Basic Measurement Examples
This section provides step-by-step instruction for working through an ordinary measurement. The following steps are described:
1. chapter 3.1.1, "Setting Up the Measurement", on page 12
2. chapter 3.1.2, "Performing the Level Detection", on page 14
3. chapter 3.1.3, "Performing the Main Measurement", on page 15
Test setup
In this example, a DUT using IEEE 802.16-2004 is be used.
Connect the DUT to the R&S FSVR using the RF input of the R&S FSVR. The DUT
generates a signal modulated using 16QAM 2/3.
3.1.1 Setting Up the Measurement
1. Activate the "WIMAX" mode.
2. Press the Settings General/Demod softkey once to select and open the chap-
ter 4.3.2, "General Settings Dialog Box", on page 84 dialog box.
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R&S® FSV-K93
WiMAX, WiBro Measurements (R&S FSV-K93)
Basic Measurement Examples
a) In the "Frequency" on page 85 field, enter the desired frequency to measure.
If a frequency is entered, which maps to a specific channel, the "Channel No"
field updates.
b) In the "Frequency Band" on page 86 field, select the signal to be analyzed.
The target band is either one of the bands given as example in the IEEE
802.16-2004 standard or an unspecified band.
c) In the "Channel BW" on page 86 or "Sample Rate" on page 86 field
depending on the characteristics of the signal to be analyzed, select a value.
The second parameter is derived from the first according to the standard.
d) In the "G = Tg/Tb" on page 86 field, select a useful time ratio according to the
characteristics of the signal to be analyzed.
e) Under "Level Settings", deactivate the "Auto Level" on page 86 option. In this
example, the level detection measurement is executed manually (for details
see Performing the level detection).
3. Press the "Settings General"/"Demod" softkey twice to select and open the chap-
ter 4.3.3, "Demod Settings Dialog Box", on page 92 dialog box.
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R&S® FSV-K93
WiMAX, WiBro Measurements (R&S FSV-K93)
Basic Measurement Examples
a) In the "Link Mode (IEEE 802.16-2004 OFDM)" on page 94 field, select the
link mode of the bursts to be analyzed.
b) In the "Demodulator" field, select the used modulation scheme.
3.1.2 Performing the Level Detection
1. Connect the DUT to the RF input of the R&S FSVR.
2. Start the level detection measurement by pressing the chapter 4.4, "Softkeys of the
Sweep Menu – SWEEP Key (R&S FSV-K93)", on page 105 and then the "Auto
Level" on page 105 softkey.
During the level detection measurement the text "Running" is displayed in the status bar at the bottom of the screen.
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R&S® FSV-K93
WiMAX, WiBro Measurements (R&S FSV-K93)
Signal Processing of the IEEE 802.16-2004 OFDM measurement application
After successful level detection, the status message "Measurement Complete" is
displayed, the signal level field for the selected input displays the detected signal
level and the Magnitude Capture Buffer (screen A) displays the zero span trace
obtained during the measurement sequence.
An automatic level detection can be performed in two ways:
●
Once by pressing the "Auto Level" on page 105 softkey in the "Sweep" menu.
●
At the start of each measurement sweep by activating the "Auto Level"
on page 86 option in the chapter 4.3.2, "General Settings Dialog Box",
on page 84 dialog box under "Level Settings".
3.1.3 Performing the Main Measurement
1. Select single sweep measurements by pressing the SWEEP key and then the Run
Single/Cont softkey to select "Single".
2. Start the measurement by pressing the RUN key.
During the measurement, the status message "Running" is displayed.
Measurement results are updated once the measurement has completed. The
results are displayed in graphical form. The display can be toggled to a tabular list
of measurement points by pressing the Display Graph/List softkey (in the "WiMAX/
WiBro" menu or "Trace" menu).
3.2 Signal Processing of the IEEE 802.16-2004 OFDM measurement application
This description gives a rough view of the IEEE 802.16-2004 OFDM measurement
application signal processing. Details are disregarded in order to get a concept overview.
Abbrevations:
Abbreviation Description
N
= 256 FFT length
FFT
a
lk
EVM
k
EVM error vector magnitude of current packet
g signal gain
∆f frequency deviation between Tx and Rx
l symbol index l = [1, nof _Symbols]
symbol from the alphabet at symbol-index l of sub carrier k
error vector magnitude of sub carrierk
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R&S® FSV-K93
WiMAX, WiBro Measurements (R&S FSV-K93)
Signal Processing of the IEEE 802.16-2004 OFDM measurement application
Abbreviation Description
nof _symbols number of symbols of payload
H
k
k channel index k = [−128,127]
K
mod
ξ
r
lk
channel transfer function of sub carrier k
modulation dependent normalization factor
relative clock error of reference oscillator
received symbol at symbol-index l of sub carrier k
Pilots = {-88, -63, -38, -13, 13, 38, 63, 88}
3.2.1 Understanding Signal Processing of the IEEE 802.16-2004 OFDM Measurement Appli-
cation.............................................................................................................................16
3.2.2 Analysis Steps...............................................................................................................21
3.2.3 Subchannelization.........................................................................................................22
3.2.4 Synchronization.............................................................................................................22
3.2.5 Channel Results............................................................................................................22
3.2.6 Frequency and Clock Offset..........................................................................................23
3.2.7 EVM.............................................................................................................................. 24
3.2.8 IQ Impairments..............................................................................................................24
3.2.9 RSSI..............................................................................................................................25
3.2.10 CINR............................................................................................................................. 26
3.2.11 OFDM Literature........................................................................................................... 26
3.2.1 Understanding Signal Processing of the IEEE 802.16-2004 OFDM Measurement Application
A diagram of the relevant blocks is shown in figure 3-1. First the RF signal is downconverted to the IF frequency fIF = 20.4 MHz. The resulting IF signal rIF(t) is shown on
the left-hand side of the figure. After bandpass filtering, the signal is sampled by an
Analog to Digital Converter (ADC) at a sampling rate of fs1 = 81.6 MHz. This digital
sequence is resampled to the new sampling frequency of fs2 = 80 MHz which is a multiple of the Nyquist rate (20 MHz).
The subsequent digital down-converter shifts the IF signal to the complex base band.
In the next step the base band signal is filtered by an FIR filter. To get an idea, the
rough transfer function is plotted in the figure. This filter fulfils two tasks: first it suppresses the IF image frequency, secondly it attenuates the aliasing frequency bands
caused by the subsequent down-sampling. After filtering, the sequence is sampled
down by the factor of 4. Thus the sampling rate of the down-sampled sequence r(i) is
the Nyquist rate of fs3 = 20 MHz. Up to this point the digital part is implemented in an
ASIC.
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R&S® FSV-K93
WiMAX, WiBro Measurements (R&S FSV-K93)
Signal Processing of the IEEE 802.16-2004 OFDM measurement application
Fig. 3-1: Signal processing of the IEEE 802.16 OFDM measurement application
In the lower part of the figure the subsequent digital signal processing is shown. In the
first block the packet search is performed. This block detects the Short Preamble (SP)
and recovers the timing. The coarse timing is detected first. This search is implemented in the time domain. The algorithm is based on cyclic repetition within the SP after N
= N
/ 2 = 128 samples. Note this cyclic repetition occurs also in the Long Preamble
FFT
(LP). Numerous treatises exist on this subject, e.g. [1] to [3].
Furthermore, a coarse estimate Δ
of the Rx-Tx frequency offset Δf is derived
course
from the metric in [6].
In this documentation, the ^ generally describes an estimate. Example: Ĥ is the estimate of H.
This can easily be understood because the phase of r(i) r* (i + N) is determined by the
mod 2π frequency offset. As the frequency deviation Δf can exceed several bins (distance between neighboring sub-carriers) the SP is further used to solve this n2π [offset
over several bins] ambiguity.
After the coarse timing calculation the time estimate is improved by the fine timing calculation. This is achieved by first estimating the coarse frequency response Ĥ
(SP)
, with
k
k = [−100, 100] denoting the channel index of the occupied sub-carriers. First the FFT
of the SP is calculated. After the FFT calculation the known symbol information of the
17Operating Manual 1176.7655.02 ─ 03.1
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R&S® FSV-K93
kl
phasephasej
klkl
neHgaKr
kl
common
l
kl
,
(
,mod
)timing(
,
)(
,
WiMAX, WiBro Measurements (R&S FSV-K93)
Signal Processing of the IEEE 802.16-2004 OFDM measurement application
SP sub-carriers is removed by dividing by the symbols. The result is a coarse estimate
Ĥk of the channel transfer function.
In the next step the complex channel impulse response is computed by an IFFT. Next
the energy of the windowed impulse response (the window size is equal to the guard
period) is calculated for each trial time. Afterwards the trail time of the maximum
energy is detected. This trial time is used to adjust the timing.
Now the position of the SP is known and the starting point of the useful part of the first
payload symbol can be derived. In the next block this calculated time instant is used to
position the payload window. Only the payload part is windowed. This is sufficient
because the payload is the only subject of the subsequent measurements.
In the next block the windowed sequence is compensated by the coarse frequency
estimate Δ
. This is necessary because otherwise inter channel interference (ICI)
course
would occur in the frequency domain.
The transition to the frequency domain is achieved by an FFT of length 256. The FFT
is performed symbol-wise for each of the nof _symbols symbols of the payload. The
calculated FFTs are described by r
l,k
with
●
l = [ 1 , nof _symbols ] as the symbol index
●
k = [ −128 , 127 ] as the channel index
In case of an additive white Gaussian noise (AWGN) channel the FFT is described by
[4], [5]
Equation (3 - 1)
with
●
K
: the modulation-dependant normalization factor
mod
●
a
: the symbol of sub-carrier k at symbol l
l,k
●
gl: the gain at the symbol l in relation to the reference gain g = 1 at the Short Preamble (SP)
●
Hk: the channel frequency response at the Short Preamble (SP)
phase
phase
(common)
l
l,k
: the common phase drift of all sub-carriers at symbol l (see Equation)
(timing)
: the phase of sub-carrier k at symbol l caused by the timing drift (see
●
●
Equation)
●
n
: the independent Gaussian distributed noise samples
l,k
The common phase drift in Equation is given by:
Equation (3 - 2)
with:
●
Ns = Ng + Nb: the number of Nyquist samples of the symbol period
18Operating Manual 1176.7655.02 ─ 03.1
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R&S® FSV-K93
lkNNphase
skl
/2
)timing(
,
WiMAX, WiBro Measurements (R&S FSV-K93)
Signal Processing of the IEEE 802.16-2004 OFDM measurement application
●
N = Nb = 256: the number of Nyquist samples of the useful part of the symbol
●
Δf
: the (not yet compensated) frequency deviation
rest
●
dϒl: the phase jitter at the symbol l
In general, the coarse frequency estimate Δ
Therefore, the remaining frequency error Δf
r
not yet compensated. Consequently, the overall frequency deviation of the device
l,k
(see figure 3-1) is not error-free.
coarse
represents the frequency deviation in
rest
under test (DUT) is calculated by:
Δf = Δ
coarse
+ Δf
rest
The only motivation for dividing the common phase drift in Equation into two parts is to
be able to calculate the overall frequency deviation of the DUT.
The reason for the phase jitter dϒl in Equation may be different. The nonlinear part of
the phase jitter may be caused by the phase noise of the DUT oscillator. Another rea-
son for nonlinear phase jitter may be the increase of the DUT amplifier temperature at
the beginning of the burst. Note that besides the nonlinear part the phase jitter dϒl also
contains a constant part. This constant part is caused by the frequency deviation Δf
rest
not yet compensated. To understand this, keep in mind that the measurement of the
phase starts at the first symbol l = 1 of the payload. In contrast, the channel frequency
response Hk in Equation represents the channel at the Short Preamble of the pream-
ble.
Consequently, the frequency deviation Δf
not yet compensated produces a phase
rest
drift between the Short Preamble and the first symbol of the payload. Therefore, this
phase drift appears as a constant value ("DC value'') in dϒl.
Referring to the IEEE 802.16-2004 measurement standard
Chapter 8.3.10.1.2 "Transmitter constellation error and test method''
[6], the common phase drift phase
(common)
l
must be estimated and compensated from
the pilots. Therefore the "symbol-wise phase tracking'' (Tracking Phase) is activated as
the default setting of the R&S FSV-K93.
Furthermore, the timing drift in Equation is given by:
Equation (3 - 3)
with ξ: the relative clock deviation of the reference oscillator.
Normally a symbol-wise timing jitter is negligible and thus not modeled in Equation.
There may be situations where the timing drift has to be taken into account. This is
illustrated by an example: In accordance to [6], the allowed clock deviation of the DUT
is up to ξ
= ±8 ppm. Furthermore, the maximal length of a frame nof _symbols =
max
2420 symbols is assumed.
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Assuming the maximum system sampling rate Fs = 32 MHz.
From equation 3-1 and Equation, it results that the phase drift of the highest sub-carrier
k = 100 in the last symbol l = nof _symbols is degrees. Even in the noise-free case,
this would lead to symbol errors. The example shows that it is actually necessary to
estimate and compensate the clock deviation, which is accomplished in the next block.
Referring to the IEEE 802.16-2004 measurement standard [6], the timing drift
phase
(timing)
is not part of the requirements. Therefore the "time tracking" (Tracking
l,k
Time) is not activated as the default setting of the R&S FSV-K93. The time tracking
option should rather be seen as a powerful analyzing option.
In addition the tracking of the gain gl in Equation is supported for each symbol in relation to the reference gain g = 1 at the time instant of the Short Preamble (SP). At this
time the coarse channel transfer function Ĥ
(SP)
is calculated.
k
This makes sense since the sequence r'
transfer function Ĥ
(SP)
before estimating the symbols. Consequently, a potential
k
is compensated by the coarse channel
l,k
change of the gain at the symbol l (caused, for example, by the increase of the DUT
amplifier temperature) may lead to symbol errors especially for a large symbol alphabet M of the MQAM transmission. In this case the estimation and the subsequent compensation of the gain are useful.
Referring to the IEEE 802.16-2004 measurement standard [6], the compensation of the
gain gl is not part of the requirements. Therefore the "gain tracking" (Tracking Gain) is
not activated as the default setting of the R&S FSV-K93.
The unknown deviations of gain, frequency and time are calculated by an optimal maximum likelihood procedure, which works well even at low signal to noise ratios with the
Cramer Rao Bound being reached. After estimation of these parameters, the received
signal is fully compensated to determine the ideal reference signal â
ted according to the user settings to get the measurement signal r'
and compensa-
l,k
. Then the mea-
l,k
surement signal is equalized by the inverse channel transfer function. According to the
chosen setting, either the preamble estimation of the channel transfer function or a
data aided estimation using the ideal reference signal is used. According to the IEEE
802.16-2004 measurement standard [6], the coarse channel estimation Ĥ
(SP)
(from the
k
short preamble) has to be used for equalization. Therefore the default setting of the
R&S FSV-K93 is equalization from the coarse channel estimate derived from the short
preamble.
In the last block the measurement variables are calculated. The most important variable is the error vector magnitude of the sub-carrier k of the current packet.
Equation (3 - 4)
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Signal Processing of the IEEE 802.16-2004 OFDM measurement application
Furthermore, the packet error vector magnitude is derived by averaging the squared
EVMk versus k.
Equation (3 - 5)
Finally, the average error vector magnitude is calculated by averaging the packet EVM
of all nof _ packets detected packets.
Equation (3 - 6)
This parameter is equivalent to the so-called "RMS average of all errors" (Error
the IEEE 802.16-2004 measurement commandment (see [6],
Chapter 8.3.10.1.2).
3.2.2 Analysis Steps
Preamble related result Remark
Rough frequency estimation In case of subchannelization, a rough frequency estimation is
Preamble power
Preamble EVM Uses payload channel estimation for equalization.
Frequency error vs. preamble
Phase error vs. preamble
Channel estimation Used for equalizing
Payload related result Remark
Fine frequency estimtion Estimation on pilots used for phase correction if 'Phase Tracking' is
) of
RMS
obtained by exploiting the cyclic prefix of the OFDM symbols.
selected. Phase tracking needs at least one pilot.
In case of subchannelization, the value shown in the result summary
table is estimated on pilots and data.
Clock offset estimation Estimation on pilots used for timing correction if 'Timing Tracking' is
selected. Timing tracking needs at least two pilots.
In case of subchannelization, the value shown in the result summary
table is estimated on pilots and data.
IQ Offset Power at spectral line 0 normalized to the total transmitted power.
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Payload related result Remark
Gain Imbalance Estimation not available in case of subchannelization.
Quadrature Error Estimation not available in case of subchannelization.
Payload channel estimation Combined with the preamble channel estimation.
Burst related result Remark
EVM All carriers
EVM Data carriers
EVM Pilot carriers
Burst Power
Crest Factor
3.2.3 Subchannelization
Subchannelization can be used in uplink bursts to allocate only a subset of the available OFDM sub carriers. The measurement software can distinguish between downlink
bursts, uplink bursts without subchannelization and uplink bursts with a selectable subchannel index. Thus it is possible to analyze the complete WirelessMAN traffic with
one capture buffer shot.
3.2.4 Synchronization
The synchronization of uplink bursts using subchannelization is performed after the
synchronization on standard downlink and uplink preambles:
According to standard normalized to the average power of all 200
used carriers.
1. Synchronization of downlink and uplink bursts without subchannelization.
2. Pre-analysis of the bursts without subchannelization to determine their length.
3. Extraction of TX power areas without already detected bursts.
4. Synchronization of uplink bursts with the selected subchannel index.
In the following sections, the influence of subchannelization on results is discussed.
3.2.5 Channel Results
The standard requires an interpolation of order 0 for the channel estimation on unallocated sub carriers, i.e. the estimated channel coefficient of the nearest allocated sub
carrier shall be used for those sub carriers not part of the allocated subchannels.
For the derived channel results like group delay or flatness difference, the unallocated
carriers are not taken into account.
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Fig. 3-2: Spectrum Flatness
3.2.6 Frequency and Clock Offset
The measurement software allows selectable compensation of phase, timing and gain
errors based on pilot estimations. However, in case of subchannelization the number of
pilots is decreased. Bursts with odd subchannel indices do not provide pilots at all.
The following table lists the restrictions on the tracking ability for subchannelization:
Tracking Subchannel Index
Phase Available Available Available, but uses rough frequency offset estima-
Timing Available Not available Not available
Gain Available Available Not available
16 (8 Pilots)
8, 24 (4 Pilots)
4, 12, 20, 28 (2
Pilots)
2, 6, 10, 14, 18, 22,
26, 30
(1 Pilot)
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29,
31 (No Pilot)
tion from the synchronization step only
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While the tracking functionality has to use pilot based estimates, the actual results for
frequency and clock offset in the result summary can be data aided. In case of subchannelization the final estimation of frequency and clock offset is done using the
already decided data sequence, which gives stable results even without pilots.
3.2.7 EVM
The error vector magnitude of a single constellation point is defined by
where r(l,k) is the received constellation point and a(l,k) is the transmitted constellation
point at the lth symbol and carrier number k.
In case of subchannelization, it is required by the standard to include the unallocated
carriers k
Thus the EVM All Carriers result for one burst in the result summary equals
by assuming a(l, k
unalloc
) = 0 in the denominator of the EVM calculation.
unalloc
where L is the number of symbols in the burst.
This definition is according to the relative constellation error defined in the IEEE
802.16-2004 standard.
Using the equations above, the error power is normalized by the average transmitted
power in all 200 carriers. Please notify that by this definition the same absolute error
power leads to different EVM results depending on the number of allocated carriers in
case of subchannelization.
3.2.8 IQ Impairments
IQ imbalance in an OFDM transmitter or receiver leads to an interference of the symbols a
with the symbols a
l-k
always situated in such a way, that a
ance on the actually allocated carriers of a subchannelization transmission. The effect
. In case of subchannelization, the used sub carriers are
l,k
= 0, if a
l,-k
≠ 0. There is no impact of IQ imbal-
l,k
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can only be seen on the unallocated carriers and yields a pattern around the origin of
the constellation diagram.
Fig. 3-3: Constellation vs Symbol
The unsymmetrical allocation of the sub carriers prevents a measurement of gain
imbalance and quadrature error in case of subchannelization. The influence of the
occupied carriers a
no possibility to distinguish them from an unknown channel coefficient.
3.2.9 RSSI
See IEEE Std 802.16-2004 [6] section "8.3.9.2 RSSI mean and standard deviation''.
The Received Signal Strength Indication [RSSI] is basically the preamble power. The
result summary provides the RSSI statistics according to the standard. A possible
method to compute RSSI[k] at the antenna connector is given in [6] equation (87).
RSSI[k] is the RSSI measurement based on the k-th signal/preamble.
The RSSI statistics of the "result summary" is calculated as follows:
1. RSSI row:
2. Statistic {min, mean, max} of the R[k]=RSSI[k].
on the unoccupied carriers a
l,k
could be measured, but there is
l,-k
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3.
The mean value is [k] according to [6] formula (89).
4. RSSI Standard Deviation row:
5.
3.2.10 CINR
See IEEE Std 802.16-2004 [6] section "8.3.9.3 CINR mean and standard deviation''.
The result summary provides the Carrier Interference Noise Ratio [CINR] statistics
according to the standard. One possible method to estimate the CINR of a single message is to compute the ratio of the sum of signal power and the sum of residual error
for each data sample, using equation (92).
with
r[k,n] received/measured sample n within message k
s[k,n] corresponding detected/reference sample (with channel state weighting)
according to [6] formula (91).
corresponding to received symbol n
The CINR statistics of the "result summary" is calculated as follows:
1. CINR row:
2. Statistic {min, mean, max} of the CINR[k].
3.
The mean value is [k] according to [6] formula (94).
4. CINR Standard Deviation row
5.
3.2.11 OFDM Literature
[1] Speth, Classen, Meyr: ''Frame synchronization of OFDM systems in frequency selective fading
[2] Schmidl, Cox: ''Robust Frequency and Timing Synchronization of OFDM", IEEE Trans. on
[3] Minn, Zeng, Bhargava: ''On Timing Offset Estimation for OFDM", IEEE Communication Letters,
according to [6] formula (96).
channels", VTC '97, pp. 1807-1811
Comm., Dec. 1997, pp. 1613-621
July 2000, pp. 242-244
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[4] Speth, Fechtel, Fock, Meyr: ''Optimum Receiver Design for Wireless Broad-Band Systems
Using OFDM – Part I", IEEE Trans. On Comm. VOL. 47, NO 11, Nov. 1999
[5] Speth, Fechtel, Fock, Meyr: ''Optimum Receiver Design for Wireless Broad-Band Systems
Using OFDM – Part II", IEEE Trans. On Comm. VOL. 49, NO 4, April. 2001
[6] IEEE 802.16-2004, Part 16: Air Interface for Fixed Broadband Wireless Access Systems; 1
October 2004; Medium Access Control (MAC) and Physical Layer (PHY) specifications
3.3 Signal Processing of the IEEE802.16-2005 OFDMA/ WiBro Measurement Application
The following description provides a brief overview of the digital signal processing used
in the IEEE 802.16 OFDMA measurement application.
From the received IF signal as the point of origin to the actual analysis results like EVM
or CINR, the digital signal processing can be divided into four major groups:
●
Data capturing
●
chapter 3.3.2, "Synchronisation", on page 30
●
chapter 3.3.3, "Channel Estimation/Equalization", on page 31
●
chapter 3.3.4, "Analysis", on page 31
The description of the IEEE802.16-2005 OFDMA/WiBro measurement signal processing is structured accordingly:
●
chapter 3.3.1, "Signal Processing Block Diagram", on page 29
●
chapter 3.3.2, "Synchronisation", on page 30
●
chapter 3.3.3, "Channel Estimation/Equalization", on page 31
●
chapter 3.3.4, "Analysis", on page 31
●
chapter 3.3.5, "OFDMA/WiBro Literature", on page 34
(OFDMA measurement application)
(OFDMA measurement application)
(OFDMA measurement application)
Abbrevations and Symbols:
Symbol Description
a
, â
l,k
l,k
Δf
res
Δf,Δ
course
ξ
g
l
Hl,k, Ĥ
l,k
i time index
î
, î
coarse
fine
data symbol (actual, decided)
residual carrier frequency offset
carrier frequency offset between transmitter and receiver (actual, coarse estimate)
relative sampling frequency offset
gain
channel transfer function (actual, estimate)
timing estimate (coarse, fine)
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Symbol Description
k, kp, kd, kch
n
subcarrier index (general, pilot, data, subchannel n)
l OFDM symbol index
N
FFT
N
g
N
s
N
sc
length of FFT
number of samples in cyclic prefix (guard interval)
number of Nyquist samples
number of subcarriers
n subchannel index, subframe index
n
l,k
Φ
l
noise sample
common phase error
I/Q imbalance (actual, estimate)
r(i) received sample in the time domain
'
''
r
l,k
'''
,r
,r
,r
l,k
l,k
l,k
received sample (uncompensated, fully compensated, partially compensated,
equalized) in the frequency domain
T useful symbol time
T
g
T
s
guard time
symbol time
Abbreviation Description
AWGN additive white Gaussian noise
BER bit error rate
CFO carrier frequency offset
CINR carrier to interference and noise ratio
CIR channel impulse response
CP cyclic prefix (guard interval)
CPE common phase error
CTF channel transfer function
DL downlink
EVM error vector magnitude
FFT fast Fourier transformation
IF intermediate frequency
ISI intersymbol interference
OFDM orthogonal frequency division multiplexing
OFDMA orthogonal frequency division multiple access
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PAPR peak to average power ratio
RSSI received signal strength indicator
SFO sampling frequency offset
UL uplink
3.3.1 Signal Processing Block Diagram
Fig. 3-4: Signal processing of the IEEE 802.16 OFDMA measurement application
The block diagram in
figure 3-4 shows the OFDMA measurement application from the
capture buffer containing the I/Q data to the actual analysis block. Outcome of the fully
compensated reference path (green) are the estimates â
bols a
. Depending on the user defined compensation, the received samples r'''
l,k
of the transmitted data sym-
l,k
l,k
of
the measurement path (orange) still contain the transmitted signal impairments of interest. The analysis block reveals these impairments by comparing the reference and the
measurement path. Prior to the analysis, diverse synchronization and channel estimation tasks have to be accomplished.
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3.3.2 Synchronisation
The first of the synchronization tasks is to detect areas of sufficient power within the
captured I/Q data stream. The subframe detection block determines the beginning and
end of each subframe and coarsely estimates both timing and carrier frequency offset.
The fine timing block prior to the FFT allows a timing improvement using a level-based
search for the beginning and end of the coarsely estimated channel impulse response.
In the DL the coarse estimate of the CIR can be directly obtained from the preamble.
Other than that the UL consists only of payload information with scattered pilots in the
subcarrier-symbol plane, thus several OFDM symbols have to be observed to get a
reliable estimate of the CIR. Since the OFDM symbols need to be phase synchronized
prior to the channel estimation, the blue blocks in the figure above figure 3-4 have to
be carried out twice. In the first iteration the timing estimate î
the window of the FFT. Having found the pilot-based estimate of the CIR, the fine timing estimate i
is used in the second iteration.
fine
After the time to frequency transformation by an FFT of length N
mation block is used to estimate the following:
relative sampling frequency offset ξ
residual carrier frequency offset Δf
common phase error Φ
is used to position
coarse
, the tracking esti-
FFT
res
l
gain g
l
Corresponding to [3] and [4], the uncompensated samples r
can be expressed as
l,k
Equation (36) (3 - 7)
with
data symbol a
channel transfer function H
number of Nyquist samples Ns within the symbol time T
useful symbol time T = Ts −T
independent and Gaussian distributed noise sample n
on subcarrier k at OFDM symbol l
l,k
l,k
g
s
l,k
Within one OFDM symbol both the CPE and the residual CFO respectively cause the
same phase rotation for each subcarrier, while the rotation due to the SFO linearly
depends on the subcarrier index. A linear phase increase in symbol direction can be
observed for the residual CFO as well as the SFO.
The results of the tracking estimation block are used to compensate the samples r
l,k
While a full compensation is performed in the reference path, the signal impairments
that are of interest to the user are left uncompensated in the measurement path.
.
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3.3.3 Channel Estimation/Equalization
According to figure 3-4, there are two coarse and one fine channel estimation blocks.
Which of the two coarse estimation blocks is used depends on the link direction. For
DL subframes the coarse channel estimation is based on the preamble and directly follows the coarse frequency compensation block. The pilot-based estimation for UL subframes is tapped behind the full compensation block of the reference path. Both of the
coarse estimation blocks use available training symbols to determine initial estimates
Ĥ
of the channel transfer function at fixed positions in the subcarrier-symbol plane.
l,k
Based on these nodes, the missing CTF values are obtained by interpolation in both
time and frequency direction. The coarse estimation results are used for the above
mentioned fine timing and to equalize the samples r'
symbol decision. Based on the decided data symbols, a fine channel estimation is performed and then used to equalize the partially compensated samples of the measurement path.
3.3.4 Analysis
The analysis block of the OFDMA measurement application allows to calculate a variety of measurement variables.
●
EVM
●
CINR
●
RSSI
●
I/Q Imbalance
●
Other Measurement Variables
of the reference path prior to
l,k
EVM
The most important variable is the error vector magnitude (EVM).
Equation (3 - 8)
on subcarrier k at OFDM symbol l. The subsequent average values can be derived
from (37).
EVM of subchannel n at OFDM symbol l:
Equation (3 - 9)
EVM of all pilot subcarriers:
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Equation (3 - 10)
EVM of all data subcarriers:
Equation (3 - 11)
EVM of all used subcarriers:
Equation (3 - 12)
The number of subcarriers respectively taken into account is denoted by Nsc.
CINR
The carrier to interference and noise ratio is determined for each subframe n. The
computation is based on the partially compensated samples r'
â
, and the channel estimates Ĥk (DL: preamble and fine; UL: fine).
l,k
, the decided symbols
l,k
Equation (3 - 13)
Further CINR statistics are defined in the standards [5], [6].
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Equation (3 - 14)
RSSI
The received signal strength indicator is determined for each subframe n. The computation is based on the time domain samples r(i) extracted by the subframe detection
block.
Equation (3 - 15)
Further RSSI statistics are defined in the standard [5], [6].
Equation (3 - 16)
I/Q Imbalance
The I/Q imbalance estimation block allows to evaluate the modulator gain balance and
the quadrature mismatch based on the block's estimate .
modulator gain balance = |1+ ΔQ|
quadrature mismatch = arg{1+ Q}
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Other Measurement Variables
Without going into detail, the OFDMA measurement application additionally provides
the following results:
●
Burst power
●
Constellation diagram
●
Group delay
●
I/Q offset
●
PAPR
●
Pilot BER
●
Spectral flatness
3.3.5 OFDMA/WiBro Literature
[1] Speth, M., Classen, F., and Meyr, H.: Frame Synchronization of OFDM Systems in Frequency
Selective Fading Channels. IEEE VTC'97, May 1997, pp. 1807-1811.
[2] Schmidl, T. M. and Cox, D. C.: Robust Frequency and Timing Synchronization of OFDM. IEEE
Trans. on Commun. Vol. 45 (1997) No. 12, pp. 1613-1621.
[3] Speth, M., Fechtel, S., Fock, G., and Meyr, H.: Optimum Receiver Design for Wireless Broad-
Band Systems Using OFDM – Part I. IEEE Trans. on Commun. Vol. 47 (1999) No. 11, pp.
1668-1677.
[4] Speth, M., Fechtel, S., Fock, G., and Meyr, H.: Optimum Receiver Design for OFDM-Based
Broadband Transmission – Part II: A Case Study. IEEE Trans. on Commun. Vol. 49 (2001) No.
4, pp. 571-578.
[5]
[6]
IEEE 802.16-2004™: Air Interface for Fixed Broadband Wireless Access Systems (2004).
IEEE Std 802.16e™-2005 and IEEE Std 802.16™-2004/Cor1-2005: Air Interface for Fixed and
Mobile Broadband Wireless Access Systems (2006)
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4 Instrument Functions WiMAX, WiBro Mea-
Instrument Functions WiMAX, WiBro Measurements (R&S FSV-K93)
surements (R&S FSV-K93)
The WiMAX IEEE 802.16 OFDM, OFDMA Measurements option (R&S FSV-K93)
extends the functionality of the R&S FSVR to enable WiMAX IEEE 802.16e, WiBro
Measurements according to the IEEE standards listed below. It includes the functionality of the WiMAX 802.16 OFDM Measurements option (R&S FSV-K93). Accordingly
both options are described together in this section, differentiated by the corresponding
standards:
●
WiMAX 802.16 OFDM Measurements (R&S FSV-K93)
– IEEE 802.16-2004/Cor 1-2005 OFDM physical layer mode
The short form IEEE 802.16-2004 OFDM is used in this section to reference
this standard. The corresponding remote control mode is OFDM.
●
WiMAX IEEE 802.16 OFDM, OFDMA Measurements option (R&S FSV-K93)
– IEEE 802.16-2004/Cor 1-2005, IEEE 802.16e-2005 OFDMA physical layer
mode
The short form IEEE 802.16e-2005 OFDMA is used in this section to reference
this standard. The corresponding remote control mode is OFDMA.
– IEEE 802.16-2004/Cor 1-2005, IEEE 802.16e-2005 based WiBro
The short form IEEE 802.16e-2005 WiBro is used in this section to reference
this standard. The corresponding remote control mode is WiBro.
TX measurements of a WiMAX Device Under Test (DUT) according to the standards
specified for the device are performed:
●
Modulation formats
– IEEE 802.16-2004: BPSK (IEEE 802.16-2004 OFDM), QPSK, 16QAM, 64QAM
●
Modulation measurements
– Constellation diagram
– Constellation diagram per OFDM carrier
– I/Q offset and I/Q imbalance
– Carrier and symbol frequency errors
– Modulation error (EVM) per OFDM carrier or symbol
– Amplitude response and group-delay distortion (spectral flatness)
●
Amplitude statistics (CCDF) and crest factor
●
Frequency and Phase error vs Symbol
●
Transmit spectrum mask
●
Adjacent Channel Power (absolute and relative)
●
FFT, also over a selected part of the signal, e.g. preamble
●
Payload bit information
●
Capture time selectable up to 50 ms, multiple sweeps possible for large number of
bursts
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Menu and Softkey Description
To open the measurement menu
●
If the "WiMAX" mode is not the active measurement mode, press the MODE key
and activate the "WiMAX" option.
●
If the "WiMAX" mode is already active, press the HOME or MEAS key.
The measurement menu is displayed.
To exit the "WiMAX" measurement mode, select another option.
4.1 Menu and Softkey Description
For WiMAX measurements, the following menus and softkeys are available.
●
chapter 4.3, "Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)", on page 45
●
chapter 4.4, "Softkeys of the Sweep Menu – SWEEP Key (R&S FSV-K93)",
on page 105
●
chapter 4.5, "Softkeys of the Marker Menu – MKR Key (R&S FSV-K93)",
on page 106
●
chapter 4.6, "Softkeys of the Marker to Menu – MKR-> Key (R&S FSV-K93)",
on page 107
●
chapter 4.7, "Softkeys of the Lines Menu – LINES Key (R&S FSV-K93)",
on page 108
●
chapter 4.8, "Softkeys of the Trace Menu – TRAC Key (R&S FSV-K93)",
on page 108
●
chapter 4.9, "Softkeys of the Input/Output Menu for WiMAX Measurements",
on page 109
The "File", "Setup", and "Print" menus are provided as described for the base unit. For
details refer to the corresponding menu descriptions. The "Span" and "Bandwidth"
menus are not available in the "WiMAX" mode.
The FREQ, AMPT and TRIG keys open the "General Settings" or the "Demod Settings" dialog box. For details refer to "Settings General/Demod" on page 46.
4.2 Further Information
This chapter provides further information about the measurements and result displays
for R&S FSV-K93 application.
●
chapter 4.2.1, "Measurement and Result Displays", on page 37
●
chapter 4.2.2, "Measurement Settings", on page 38
●
chapter 4.2.3, "Result Summary List", on page 39
●
chapter 4.2.4, "Result Display Graph", on page 42
●
chapter 4.2.5, "Transfering the Current R&S SMU WiMAX Settings via LAN",
on page 44
●
chapter 4.2.6, "Title Bar Information", on page 44
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●
chapter 4.2.7, "Status Bar Information", on page 44
Further Information
4.2.1 Measurement and Result Displays
The WiMAX IEEE 802.16 OFDM, OFDMA Measurements option provides two main
measurement types:
●
IQ measurements (based on captured IQ data)
– Power vs Time (see "PVT" on page 46 softkey)
– EVM vs Symbol, EVM vs Carrier (see "EVM vs Symbol/Carrier" on page 52
softkey)
– Phase vs Preamble, Frequency vs Preamble (see "Error Frequency/Phase
(IEEE 802.16-2004 OFDM)" on page 55 softkey)
– Spectrum Flatness (see "Spectrum Flat./Diff./Group Delay (IEEE 802.16-2004
OFDM, WiBro)" on page 61 softkey)
– Spectrum Flatness Adjacent Carrier Power Difference (see "Spectrum Flat./
Diff./Group Delay (IEEE 802.16-2004 OFDM, WiBro)" on page 61 softkey)
– Spectrum Group Delay (see "Spectrum Flat./Diff./Group Delay (IEEE
802.16-2004 OFDM, WiBro)" on page 61 softkey)
– Preamble Channel Frequency Response: Phase (see "Channel Phase/Group
Delay (IEEE 802.16e-2005 OFDMA)" on page 66 softkey)
– Spectrum FFT (see "Spectrum FFT" on page 72 softkey)
– Constellation vs Symbol (see "Constell vs Symbol/Carrier" on page 57 soft-
key)
– Constellation vs Carrier (IEEE 802.16-2004 OFDM only, see "Constell vs Sym-
bol/Carrier" on page 57 softkey)
– Conditional Cumulative Distribution Function (see "CCDF" on page 77 soft-
key)
– Bit Stream (see "Bitstream" on page 79 softkey)
●
frequency sweep measurements
– Spectrum Mask (see "SEM Settings" on page 75 softkey)
– Spectrum ACP/ACPR (see "ACPR Abs/Rel" on page 73 softkey)
For current restrictions refer to "Current restrictions to the IEEE 802.16e-2005 OFDMA/
WiBro signal to be analyzed.
Result display
The measurement result display is divided into two parts:
●
chapter 4.2.2, "Measurement Settings", on page 38
●
Result display
The results can be displayed in form of a list or a graph (see also Display Graph/List
softkey).
●
chapter 4.2.3, "Result Summary List", on page 39
●
chapter 4.2.4, "Result Display Graph", on page 42
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Further Information
When a graph is displayed, the result area can be split into 2 screens (see Screen Size
Full/Split softkey):
●
Screen A: capture buffer display
●
Screen B: measurement result display
Saving results
The measurement results (trace and result summary) can be stored at any time using
the SAVE/RCL key (see the base unit description). Note that the originally measured
values are always stored. The values are not updated after changes to the Demod Settings.
4.2.2 Measurement Settings
The overall measurement settings used to obtain the current measurement results are
displayed below the title bar (see figure 4-1). The following settings are listed:
Setting Description Restrictions
Frequency The frequency of the measured input signal.
Burst Type The type of burst being analyzed. IEEE 802.16-2004 OFDM only
Zone/Seg The zone and segment being analyzed IEEE 802.16e-2005 OFDMA/
Signal Level The expected mean signal level for the input signal.
Modulation Shows the active setting selected in the "Demod
Settings" dialog box, "Demodulator" list.
If the "Mod". "Detection" field is set to "ALL", "ALL"
is displayed.
External Att The attenuation (positive values) or gain (negative
Shows the active setting selected in the "Demod
Settings" dialog box, "Demodulator" list.
If the "Modulation Analysis Scope" field is set to
"ALL", "ALL" is displayed.
values) applied to the signal externally (i.e. before
the RF or IQ connector of the spectrum analyzer),
e.g.:
External Att = 10 dB means that before the RF connector of the R&S FSVR a 10 dB attenuator is used
External Att = -20 dB means that before the RF connector of the R&S FSVR a amplifier with 20 dB gain
is used.
WiBro only
IEEE 802.16-2004 OFDM only
IEEE 802.16e-2005 OFDMA/
WiBro only
Data Symbols Shows the minimum and maximum number of data
symbols that a burst may have to be considered in
results analysis.
Zone Offset/Length A combined display of the offset and length of the
analyzed zone
IEEE 802.16-2004 OFDM only
IEEE 802.16e-2005 OFDMA/
WiBro only
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Further Information
Fig. 4-1: Measurement settings for IEEE 802.16-2004 OFDM (example)
Fig. 4-2: Measurement settings for IEEE 802.16e-2005 OFDMA/WiBro (example)
4.2.3 Result Summary List
If the results are displayed in tabular form (Display Graph/List softkey), the result summary list is displayed. It shows the overall measurement results and provides limit
checking for result values in accordance with the selected standard. Result values
which are within the limit as specified by the standard are displayed in green. Result
values which are outside of the limits specified by the standard are displayed in red
with a '*' to the left. Results which have no limits specified by the standard are displayed in white. Limit values are displayed in white (not bold) and can be modified,
when focused, via the keypad. Limits are modified for the currently selected modulation
scheme. Each modulation scheme may have its own set of user defined limits. To
reset the limit values to the values specified in the standard, use the "Lines" menu
(LINES key).
●
IEEE 802.16-2004 OFDM
The results displayed in this list are for the entire measurement. If a specific number of bursts have been requested which requires more than one sweep, the result
summary list is updated at the end of each sweep. The number of bursts measured
and the number of bursts requested are displayed to show the progress through
the measurement. The Min/Mean/Max columns show the minimum, mean or maximum values of the burst results.
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Further Information
Fig. 4-3: Result summary list for IEEE 802.16-2004 OFDM (example)
●
IEEE 802.16e-2005 OFDMA, WiBro
For these measurement results, the minimum, mean, and maximum is taken over the
analyzed zones of the current capture buffer content.
Two lists are available:
●
Result Summary of Analyzed Subframes (list 1)
●
Result Summary of Analyzed Zone/Segment (list 2)
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Further Information
Fig. 4-4: Result summary list for IEEE 802.16e-2005 OFDMA/WiBro (example)
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Further Information
Fig. 4-5: Result summary list 2 for IEEE 802.16e-2005 OFDMA/WiBro (example)
4.2.4 Result Display Graph
●
IQ measurements
If the results are displayed in graphical form (Display Graph/List softkey), additionally to the selected graphical result display, the Magnitude Capture Buffer (power
profile) display is provided for all IQ measurements. The different result displays
are described with the corresponding softkey.
The Magnitude Capture Buffer display shows the complete range of captured data
for the last sweep. All analyzed bursts are identified with a green bar at the bottom
of the Magnitude Capture Buffer display. Only those bursts match the required criteria. The gate delay line ("GD") and gate length line ("GL") are displayed in red
color.
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Further Information
Fig. 4-6: Magnitude capture buffer results (example)
All IQ measurements process the same signal data and as such all IQ measurement
results are available after a single IQ measurement execution.
IQ measurements can be run in split screen mode (allowing both the Magnitude Capture Buffer display and the selected IQ measurement results to be displayed simultaneously) or in full screen mode (with either the Magnitude Capture Buffer display or the
selected IQ measurement results displayed).
If measuring OFDMA or WiBro measurements, the time from the start of the capture
buffer to the start of the first frame is also displayed in the Magnitude Capture buffer.
This time is marked with a vertical blue line, with the result displayed at the top of the
graph.
●
Frequency sweep measurements
The frequency sweep measurements use different signal data to IQ measurements
and as such it is not possible to run an IQ measurement and then view the results
in the frequency sweep measurements and vice-versa. Also because each of the
frequency sweep measurements uses different settings to obtain signal data it is
not possible to run a frequency sweep measurement and view the results of
another frequency sweep measurement.
All frequency sweep measurements are run in full screen mode.
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Further Information
4.2.5 Transfering the Current R&S SMU WiMAX Settings via LAN
Prerequisite: The Windows Firewall of the R&S SMU is switched off.
1. Press the Settings General/Demod softkey to open the "General Settings" dialog
box.
2. Under "Signal Characteristics" in the Standard list, select the "IEEE
802"."16e"-"2005 OFDMA" or "IEEE 802"."16e"-"2005 WiBro" standard.
3. Open the "Advanced Settings" dialog box
4. Under SETUP in the SMU Address field specify the TCP/IP address of the R&S
SMU.
5. Press the "More >" softkey to change into the side menu.
6. Press the File Manager softkey to open the File Manager.
7. Under "Folders", select the "SMU" entry.
8. Under "Files", select the "Current SMU WiMAX Settings" entry using the "RIGHTARRROW" key.
9. Press the "Recall" softkey.
10. The selected WiMAX setting file is transferred from the R&S SMU to the
R&S FSVR.
4.2.6 Title Bar Information
The title bar displays the following information:
●
standard applicable to the current measurement
4.2.7 Status Bar Information
The status bar displays the following information:
●
parameter values
If a parameter in a settings dialog box is selected, the minimum and maximum values for the selected parameter are displayed.
If a Boolean parameter in a dialog box is selected, the minimum and maximum values are displayed as N/A for not applicable.
●
measurement status
During the measurement, the current measurement status along with detailed information about the progress is displayed.
●
error messages (with red background)
●
warning messages (with yellow background)
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Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)
4.3 Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)
The following table shows all softkeys available in the "WiMAX" menu. It is possible
that your instrument configuration does not provide all softkeys. If a softkey is only
available with a special option, model or (measurement) mode, this information is delivered in the corresponding softkey description.
4.3.1 Description of the softkeys of the WiMAX, WiBro Menu
Settings General/Demod...............................................................................................46
Display Graph/List.........................................................................................................46
PVT............................................................................................................................... 46
└ Full Burst (IEEE 802.16-2004 OFDM)............................................................ 46
└ Start End (IEEE 802.16-2004 OFDM).............................................................47
└ Burst Selection (IEEE 802.16-2004 OFDM)................................................... 48
└ Full Subframe (IEEE 802.16e-2005 OFDMA/WiBro)......................................48
└ Rising/Falling (IEEE 802.16e-2005 OFDMA/WiBro).......................................49
└ Gating Settings On/Off....................................................................................50
└ Import..............................................................................................................51
└ Export..............................................................................................................51
└ R&S Support...................................................................................................51
EVM Constell................................................................................................................ 52
└ EVM vs Symbol/Carrier...................................................................................52
└ Error Frequency/Phase (IEEE 802.16-2004 OFDM)...................................... 55
└ Constell vs Symbol/Carrier............................................................................. 57
└ Carrier Selection All (IEEE 802.16-2004 OFDM)............................................60
└ Constell Selection (IEEE 802.16e-2005 OFDMA/WiBro)................................60
└ Y-Axis/Div ...................................................................................................... 60
Spectrum.......................................................................................................................61
└ Spectrum Flat./Diff./Group Delay (IEEE 802.16-2004 OFDM, WiBro)............61
└ Spectrum Flatness/Difference (IEEE 802.16e-2005 OFDMA)........................64
└ Channel Phase/Group Delay (IEEE 802.16e-2005 OFDMA)......................... 66
└ Spectrum.........................................................................................................68
└ Spectrum FFT.................................................................................................72
└ ACPR Abs/Rel................................................................................................ 73
└ SEM Settings.................................................................................................. 75
└ SEM according to................................................................................. 75
└ File Name............................................................................................. 76
└ Link Direction........................................................................................76
└ Power Class..........................................................................................76
└ SEM Configuration................................................................................76
└ ACP Settings...................................................................................................76
Statistics........................................................................................................................77
└ CCDF..............................................................................................................77
└ Bitstream.........................................................................................................79
└ Burst Summary............................................................................................... 81
└ Bit Selection (IEEE 802.16e-2005 OFDMA/WiBro)........................................ 83
File Manager (IEEE 802.16e-2005 OFDMA/WiBro)......................................................83
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Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)
Settings General/Demod
Opens the chapter 4.3.2, "General Settings Dialog Box", on page 84 or the chap-
ter 4.3.3, "Demod Settings Dialog Box", on page 92 dialog box. Screenshots of the
dialog boxes are provided in chapter 3.1, "Basic Measurement Examples", on page 12.
Alternatively, the "General Settings" dialog box is opened as follows:
●
FREQ key, with focus on the "Frequency" field
●
AMPT key, with focus on the "Signal Level" ("RF") field
●
TRIG key, with focus on the "Trigger Mode" field
Display Graph/List
Configures the result display. The measurement results are displayed either in form of
a list of measurement points or as a graphical trace.
For details on the result displays refer to chapter 4.2.3, "Result Summary List",
on page 39 and chapter 4.2.4, "Result Display Graph", on page 42.
Remote command:
DISPlay[:WINDow<n>]:TABLe on page 183
PVT
Opens the PVT submenu to select the "Power vs Time" measurement results.
The PVT result displays show the measured input data over the full range or over com-
plete bursts, displayed within the gating lines if gating is switched on. The results are
displayed as a single burst. If the gate start or gate length are altered then the results
can be updated to reflect these changes by pressing the Refresh softkey in the
"Sweep" menu.
Remote command:
CONFigure:BURSt:PVT[:IMMediate] on page 155
Full Burst (IEEE 802.16-2004 OFDM) ← PVT
Displays the PVT results in a single graph with all burst data being displayed ("Display
Graph" selected), or in a list ("Display List" selected).
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Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)
For further details refer to the Display Graph/List softkey.
Remote command:
CONFigure:BURSt:PVT:SELect on page 155
Start End (IEEE 802.16-2004 OFDM) ← PVT
Displays the results in two separate graphs, the left hand side showing the start and
the right hand side showing the end of a burst ("Display Graph" selected), or in a list
("Display List" selected).
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Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)
Remote command:
CONF:BURS:PVT:SEL EDGE, see CONFigure:BURSt:PVT:SELect on page 155
Burst Selection (IEEE 802.16-2004 OFDM) ← PVT
Opens an edit dialog box to select a burst by entering its number.
Remote command:
CONFigure:BURSt:PVT:BURSt on page 155
Full Subframe (IEEE 802.16e-2005 OFDMA/WiBro) ← PVT
Displays the results in a single graph with the minimum, mean, and maximum power
profile of the subframe that contains the zone selected to be analyzed ("Display Graph"
selected), or in two lists ("Display List 1/2" selected).
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Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)
Remote command:
CONF:BURS:PVT:SEL FULL, see CONFigure:BURSt:PVT:SELect on page 155
Rising/Falling (IEEE 802.16e-2005 OFDMA/WiBro) ← PVT
Displays the results in two separate graphs: the minimum, mean, and maximum power
profile of rising (on the left hand) or falling (on the right hand) edge of the subframe that
contains the zone selected to be analyzed ("Display Graph" selected), or in two lists
("Display List 1/2" selected).
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Softkeys of the WiMAX, WiBro Menu (R&S
FSV-K93)
Remote command:
CONF:BURS:PVT:SEL EDGE, see CONFigure:BURSt:PVT:SELect on page 155
Gating Settings On/Off ← PVT
Activates or deactivates gating, or opens the "Gate Settings" dialog box to specify
range of captured data used in results calculation (available for Spectrum Mask, Spectrum FFT, Spectrum ACPR, CCDF).
On Uses only the specified range of captured data in results calculation. In the Magnitude Capture
Buffer trace, two vertical lines mark the specified range.
Off Uses all the captured data in results calculation.
In the "Gate Settings" dialog box, the following parameters are set:
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Softkeys of the WiMAX, WiBro Menu (R&S
Delay Start point of captured data to be used in results calculation, i.e. the
delay from the start of the captured data in time or samples. If the
delay is specified in time, the number of samples is updated accordingly, and vice versa.
Length Amount of captured data to be used in results calculation. If the
length is specified in time, the number of samples is updated accordingly, and vice versa.
Link Gate and Marker If activated, the position of the marker and the gate lines are linked.
The marker is positioned half way between gate start and end. The
marker position alters if the gate is modified, and the gate lines move
with the marker if the marker position is altered.
FSV-K93)
The gate settings are defined for following measurements: Spectrum FFT, CCDF,
Spectrum Mask, Spectrum ACPR.
If a frequency sweep measurement is active (Spectrum Mask and Spectrum ACP), the
result display is switched to the Magnitude Capture Buffer display in order to help
defining the gate settings correctly.
Remote command:
[SENSe:]SWEep:EGATe on page 220
[SENSe:]SWEep:EGATe:HOLDoff:SAMPle on page 220
[SENSe:]SWEep:EGATe:LENGth:SAMPle on page 221
[SENSe:]SWEep:EGATe:LINK on page 221
Import ← PVT
Opens the "Choose the file to import" dialog box.
Select the IQ data file you want to import and press ENTER. The extension of data
files is *.iqw.
This function is not available while a measurement is running.
Remote command:
MMEMory:LOAD:IQ:STATe on page 203
Export ← PVT
Opens the "Choose the file to export" dialog box.
Enter the path and the name of the I/Q data file you want to export and press ENTER.
The extension of data files is *.iqw. If the file cannot be created or if there is no valid
I/Q data to export an error message is displayed.
This function is not available while a measurement is running.
Remote command:
MMEMory:STORe:IQ:STATe on page 204
R&S Support ← PVT
Stores useful information for troubleshooting in case of errors.
This data is stored in the C:\R_S\Instr\user\Support directory on the instru-
ment.
If you contact the Rohde&Schwarz support to get help for a certain problem, send
these files to the support in order to identify and solve the problem faster.
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Softkeys of the WiMAX, WiBro Menu (R&S
EVM Constell
Opens a submenu to select the error vector magnitude (EVM) or the constellation
result displays.
EVM vs Symbol/Carrier ← EVM Constell
Selects the EVM vs Symbol or EVM vs Carrier result displays.
●
EVM vs Symbol (IEEE 802.16-2004 OFDM)
This result display shows the EVM measured over the full range of the measured
input data. The results are displayed on a per-symbol basis, with blue vertical lines
marking the boundaries of each burst. Note that burst boundary lines are only displayed if the number of analyzed bursts is less than 250. The minimum, average,
and maximum traces are displayed.
For the trace labeled with EVM a commonly used EVM definition is applied, which
is the square root of the momentary error power normalized by the averaged reference power. For details of this measurement refer to chapter 3.2.1, "Understanding
Signal Processing of the IEEE 802.16-2004 OFDM Measurement Application",
on page 16.
FSV-K93)
●
EVM vs Symbol (IEEE 802.16e-2005 OFDMA/WiBro)
This result display shows all EVM values versus the symbols of the analyzed zone.
If the capture buffer contains more than one analyzed zones, the corresponding
result graphs will be appended. The minimum, mean, and maximum statistics is
performed over carriers.
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Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)
●
EVM vs Carrier (IEEE 802.16-2004 OFDM)
This result display shows all EVM values recorded on a per-carrier basis over the
full set of measured data. The minimum, average and maximum traces are displayed.
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Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)
●
EVM vs Carrier (IEEE 802.16e-2005 OFDMA/WiBro)
This result display shows all EVM values versus the physical carriers. The minimum, mean, and maximum statistics is performed over the symbols of all analyzed
zones in the capture buffer.
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Softkeys of the WiMAX, WiBro Menu (R&S
FSV-K93)
Remote command:
EVM vs Symbol: CONF:BURS:EVM:ESYM, see CONFigure:BURSt:EVM:ESYMbol[:
IMMediate] on page 154
EVM vs Carrier: CONF:BURS:EVM:ECAR, see CONFigure:BURSt:EVM:
ECARrier[:IMMediate] on page 153
Error Frequency/Phase (IEEE 802.16-2004 OFDM) ← EVM Constell
Selects the Frequency Error vs Preamble or the Phase Error vs Preamble result displays.
●
Error Frequency/Phase (IEEE 802.16-2004 OFDM)
These result displays show the error values recorded over the preamble part of the
burst. A minimum, average and maximum trace are displayed. The results display
either relative frequency error or phase error.
Using the Y-Axis/Div softkey, the scaling of the y-axis can be modified to allow the
results to be scaled to an optimum level.
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Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)
●
Error Frequency/Phase (IEEE 802.16e-2005 OFDMA/WiBro)
These result displays show the error values recorded over the first two symbols of
the subframe. In OFDMA/WiBro this measurement result is available under the following condition: All subchannels are used by data bursts. A minimum, average
and maximum trace are displayed. The results display either relative frequency
error or phase error.
Using the Y-Axis/Div softkey, the scaling of the y-axis can be modified to allow the
results to be scaled to an optimum level.
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Softkeys of the WiMAX, WiBro Menu (R&S FSV-K93)
Remote command:
CONFigure:BURSt:PREamble[:IMMediate] on page 154
CONFigure:BURSt:PREamble:SELect on page 154
Constell vs Symbol/Carrier ← EVM Constell
Selects the Constellation vs Symbol or the Constellation vs Carrier result displays.
●
Constellation vs Symbol (IEEE 802.16-2004 OFDM)
This result display shows the in-phase and quadrature phase results over the full
range of the measured input data. The ideal points for the selected modulations
scheme are displayed for reference purposes.
The amount of data displayed in the Constellation result display can be reduced by
selecting the carrier or carriers for which data is to be displayed (Carrier Selection
All (IEEE 802.16-2004 OFDM) softkey).
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●
Constellation vs Symbol (IEEE 802.16e-2005 OFDMA/WiBro)
This result display shows the complex constellation diagram of the modulation
symbols. The modulation symbols belong to the bursts of the analyzed zone. The
different modulation formats are displayed in unique colors. The same color
assignment is used in the Bitstream result display.
The amount of data displayed in the Constellation result display can be reduced via
the Constell Selection (IEEE 802.16e-2005 OFDMA/WiBro) softkey.
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●
Constellation vs Carrier (IEEE 802.16-2004 OFDM)
This result display shows the in-phase and quadrature phase results over the full
range of the measured input data plotted on a per-carrier basis. The magnitude of
the in-phase and quadrature part is shown on the y-axis, both are displayed as
separate traces (I-> trace 1, Q-> trace 2).
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FSV-K93)
Remote command:
CONFigure:BURSt:CONSt:CSYMbol[:IMMediate] on page 152
CONFigure:BURSt:CONSt:CCARrier[:IMMediate] on page 152
Carrier Selection All (IEEE 802.16-2004 OFDM) ← EVM Constell
Opens a dialog box to select the carrier for data display. Either a specific carrier number, pilots only or all carriers can be selected.
Remote command:
CONFigure:BURSt:CONSt:CARRier:SELect on page 151
Constell Selection (IEEE 802.16e-2005 OFDMA/WiBro) ← EVM Constell
Opens a dialog box for filtering the displayed results. The results may be filtered by any
combination of modulation, burst, symbol, or carrier. If the constellation selection
parameters are changed, the result display is updated accordingly.
Remote command:
CONFigure:BURSt:CONSt:SYMBol:SELect on page 153
CONFigure:BURSt:CONSt:FORMat:SELect on page 153
CONFigure:BURSt:CONSt:BURSt:SELect on page 151
Y-Axis/Div ← EVM Constell
Opens a dialog box to modify the y-axis settings (EVM vs Symbol/Carrier, Error Frequency/Phase measurements, if trace data is displayed):
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"Auto Scaling"
"Per Division"
"Unit"
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:AUTO on page 184
DISPlay[:WINDow<n>]:TRACe1:Y[:SCALe]:PDIVision on page 185
UNIT:EVM on page 242
UNIT:PREamble on page 242
Spectrum
Opens a submenu for frequency measurements.
Spectrum Flat./Diff./Group Delay (IEEE 802.16-2004 OFDM, WiBro) ← Spectrum
Toggles between the Spectrum Flatness, Flatness Difference, or Group Delay result
display. The result can be displayed.
●
Spectrum Flatness
The result display shows the average energy of the constellation points for the
physical carriers being used for the channel estimation. You can define which parts
of the subframe are to be used for the channel estimation. The limit lines are displayed according to the requirements of the standard. The minimum, mean, and
maximum statistics are performed over the parts of the subframe contributing to the
channel estimation.
CONFigure:BURSt:SPECtrum:FLATness[:IMMediate] on page 157
Starts the Spectrum Flatness measurement.
CONFigure:BURSt:SPECtrum:FLATness:SELect on page 157
Selects the display mode for the results to be spectrum flatness.
The scaling of the y-axis is calculated automatically
Specifies the scaling to be used if Auto Scaling is deactivated
Specifies the y-axis unit
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Fig. 4-7: Spectrum Flatness for IEEE 802.16-2004 OFDM and WiBro
●
Spectrum Flatness Difference
The result display shows the absolute difference of adjacent carriers being used for
the channel estimation. You can define which parts of the subframe are to be used
for the channel estimation. The limit lines are displayed according to the requirements of the standard. The minimum, mean, and maximum statistics are performed
over the parts of the subframe contributing to the channel estimation.
CONFigure:BURSt:SPECtrum:FLATness[:IMMediate] on page 157
Selects the Spectrum Flatness measurement.
CONFigure:BURSt:SPECtrum:FLATness:SELect on page 157
Selects the display mode for the results to be spectrum flatness difference.
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Fig. 4-8: Spectrum Flatness Difference for IEEE 802.16-2004 OFDM
●
Group Delay
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Fig. 4-9: Group Delay for IEEE 802.16-2004 OFDM
CONFigure:BURSt:SPECtrum:FLATness[:IMMediate] on page 157
Selects the Spectrum Flatness measurement.
CONFigure:BURSt:SPECtrum:FLATness:SELect on page 157
Selects the display mode for the results to be group delay.
Spectrum Flatness/Difference (IEEE 802.16e-2005 OFDMA) ← Spectrum
Toggles between the Spectrum Flatness and Flatness Difference result display. The
result can be displayed.
●
Spectrum Flatness
The result display shows the average energy of the constellation points for the
physical carriers being used for the channel estimation. You can define which parts
of the subframe are to be used for the channel estimation. The limit lines are displayed according to the requirements of the standard. The minimum, mean, and
maximum statistics are performed over the parts of the subframe contributing to the
channel estimation.
CONFigure:BURSt:SPECtrum:FLATness[:IMMediate] on page 157
Selects the Spectrum Flatness measurement.
CONFigure:BURSt:SPECtrum:FLATness:SELect on page 157
Selects the display mode for the results to be spectrum flatness.
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Fig. 4-10: Spectrum Flatness for IEEE 802.16e-2005 OFDMA
●
Spectrum Flatness Difference
The result display shows the absolute difference of adjacent carriers being used for
the channel estimation. You can define which parts of the subframe are to be used
for the channel estimation. The limit lines are displayed according to the requirements of the standard. The minimum, mean, and maximum statistics are performed
over the parts of the subframe contributing to the channel estimation.
CONFigure:BURSt:SPECtrum:FLATness[:IMMediate] on page 157
Selects the Spectrum Flatness measurement.
CONFigure:BURSt:SPECtrum:FLATness:SELect on page 157
Selects the display mode for the results to be spectrum flatness difference.
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Fig. 4-11: Spectrum Flatness Difference for IEEE 802.16e-2005 OFDMA
Channel Phase/Group Delay (IEEE 802.16e-2005 OFDMA) ← Spectrum
Toggles between the Preamble Channel Frequency Response Phase and the Group
Delay result display. The result can be displayed.
●
Channel Phase
The result display shows the phase of the preamble channel frequency response.
The limit lines are displayed according to the requirements of the standard. The
Triangle marker indicated with a U indicates the minimal distance to the Upper
Limit Line. The Triangle marker indicated with an L indicates the minimal distance
to the Lower Limit Line.The minimum, mean, and maximum statistics are performed over the preambles of the analyzed subframes.
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Fig. 4-12: Preamble Channel Frequency Response Phase for IEEE 802.16e-2005 OFDMA
CONFigure:BURSt:SPECtrum:PHASe:PREamble[:IMMediate] on page 159
Selects the Preamble Channel Frequency Response: Phase measurement.
●
Group Delay
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Fig. 4-13: Group Delay for IEEE 802.16e-2005 OFDMA/WiBro
Restrictions on OFDMA/WiBro Group Delay measurements
The measurement requires all useful carriers to be active (for example for a 1024 FFT
size, 840 positions are required). This requirement does not depend on the subchannel
bitmap, i.e. the bitgroups that are switched on. It solely depends on the FFT size and
guard band.
This requirement is affected by the Channel Estimation Range parameters in the
Demod Settings:
●
- If Downlink (DL) = Preamble Only, then the requirement is automatically met.
●
- If Downlink (DL) = Preamble and Payload/Payload Only, then all bitgroups must
be switched on and all channels must be covered by data bursts.
Spectrum ← Spectrum
Selects the Spectrum Emission Mask result display, which consists of a graphical and
tabular result.
This result display shows power against frequency (as opposed to "Spectrum FFT"
on page 72). A limit line representing the spectrum mask specified for the selected
standard is displayed and an overall pass/fail status is displayed for the obtained
results against this limit line.
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For the IEEE 802.16-2004 OFDM, IEEE 802.16e-2005 OFDMA standards, the span of
the results is related to the specified sample rate.
For the IEEE 802.16e-2005 WiBro standard, the table contains the results for each of
the individual frequency ranges. On the trace, the highest power value is marked for
each of the specified frequency ranges with a marker.
The number of sweeps is set in the General Settings dialog box, Sweep Count field. If
the measurement is performed over multiple sweeps both a max hold trace and an
average trace are displayed. For the IEEE 802.16e-2005 WiBro standard, the Spectrum Emission Mask measurement is configured via the SEM Settings softkey.
●
Spectrum IEEE (IEEE 802.16-2004 OFDM)
●
Spectrum IEEE (IEEE 802.16e-2005 OFDMA)
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●
Spectrum ETSI (IEEE 802.16-2004 OFDM)
●
Spectrum ETSI (IEEE 802.16e-2005 OFDMA)
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Softkeys of the WiMAX, WiBro Menu (R&S
FSV-K93)
Remote command:
CONFigure:BURSt:SPECtrum:MASK[:IMMediate] on page 158
CONFigure:BURSt:SPECtrum:MASK:SELect on page 158
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Spectrum FFT ← Spectrum
Selects the Spectrum FFT result display (as opposed to "Spectrum" on page 68),
either in graphical form ("Display Graph" selected), or in tabular form ("Display List 1/2"
selected).
This result display shows the Power vs Frequency results obtained from a FFT performed over the range of data in the Magnitude Capture Buffer which lies within the
gate lines. If the gate start or gate length are altered then the results can be updated to
reflect these changes by pressing the Refresh softkey in the Sweep menu.
●
IEEE 802.16-2004 OFDM
●
IEEE 802.16e-2005 OFDMA/WiBro
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Remote command:
CONFigure:BURSt:SPECtrum:FFT[:IMMediate] on page 157
ACPR Abs/Rel ← Spectrum
Sets the ACPR (Adjacent Channel Power Relative) result display in graphical form
("Display Graph" selected), or in tabular form ("Display List 1/2" selected).
This result display is similar to the Spectrum Mask measurement, and provides information about leakage into adjacent channels. The results show the relative power
measured in the three nearest channels either side of the measured channel. This
measurement is the same as the adjacent channel power measurement provided by
the spectrum analyzer.
The number of sweeps is set in the "General Settings" dialog box, "Sweep Count" field
(see chapter 4.3.2, "General Settings Dialog Box", on page 84). If the measurement
is performed over multiple sweeps both a max hold trace and an average trace are displayed.
●
IEEE 802.16-2004 OFDM
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●
IEEE 802.16e-2005 OFDMA/WiBro
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Remote command:
CONFigure:BURSt:SPECtrum:ACPR[:IMMediate] on page 156
CONFigure:BURSt:SPECtrum:ACPR:SELect on page 156
CALCulate<n>:MARKer<m>:FUNCtion:POWer:RESult[:CURRent]?
on page 142
CALCulate<n>:MARKer<m>:FUNCtion:POWer:RESult:MAXHold? on page 147
SEM Settings ← Spectrum
Opens the "Spectrum Emission Mask Settings" dialog box to configure the Spectrum
Emission Mask measurement.
The other parameters are set by default.
Remote command:
[SENSe:]POWer:SEM:TTA on page 217
[SENSe:]POWer:SEM:MODe on page 217
[SENSe:]POWer:SEM:CLASs on page 216
SEM according to ← SEM Settings ← Spectrum
Specifies how the Spectrum Emission Mask settings and limits are applied. This
parameter provides the following settings:
"TTA Standard"
as specified in the standard
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"ETSI"
"USER"
Remote command:
[SENSe:]POWer:SEM:TTA on page 217
File Name ← SEM Settings ← Spectrum
When "SEM according to":"User" settings are specified, "File Name" shows the name
of the loaded XML file. Clicking the arrow switches to the File Manager to locate an
XML file, and automatically selects "SEM according to":"User".
When using "ETSI" or "IEEE" standards, "File Name" indicates the name of the built-in
configuration.
Remote command:
MMEMory:LOAD:SEM:STATe 1, on page 204
Link Direction ← SEM Settings ← Spectrum
Sets the link direction:
"UL"
"DL"
Settings and limits are as specified in the standard (OFDM/OFDMA)
as specified in the selected XML file
uplink
downlink
FSV-K93)
Power Class ← SEM Settings ← Spectrum
Sets the power class
"Auto"
"(-INF, 23)
dBm, (23, INF)
dBm"
"(-INF, 29)
dBm, (29, 40)
dBm, (40, INF)
dBm"
Remote command:
[SENSe:]POWer:SEM:CLASs on page 216
SEM Configuration ← SEM Settings ← Spectrum
The table shows the settings and limits applied over specified frequency ranges around
the TX channel.
ACP Settings ← Spectrum
Opens the "ACP Settings" dialog box to configure the ACPR result display. By default,
the ACP settings are derived from the "General Settings" dialog box, "Channel BW"
field (see chapter 4.3.2, "General Settings Dialog Box", on page 84).
automatic selection
power class values for uplink
power class values for downlink
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Group Field Description
Channels No. of Chan-
nels
TX/ACP ChannelBWTX Specifies the bandwidth of the transmit channel to be measured by
Adjacent,
Alternate 1,
Alternate 2,
Alternate 3,
Alternate 4
ACP Channel
Spacing
Adjacent,
Alternate 1,
Alternate 2,
Alternate 3,
Alternate 4
Specifies the number of channels adjacent to the transmit channel to
be measured.
If set to 0, only the transmit channel is measured.
the ACP measurement.
Specifies the bandwidth of the first to fifth channel before and after
the transmit channel to be measured.
Specifies the spacing of the first to fifth channel before and after the
transmit channel to be measured.
Remote command:
[SENSe:]POWer:ACHannel:ACPairs on page 213
[SENSe:]POWer:ACHannel:BANDwidth|BWIDth[:CHANnel<channel>]
on page 214
[SENSe:]POWer:ACHannel:SPACing[:ACHannel] on page 215
[SENSe:]POWer:ACHannel:SPACing:ALTernate<channel> on page 215
[SENSe:]POWer:ACHannel:BANDwidth|BWIDth:ACHannel on page 214
[SENSe:]POWer:ACHannel:BANDwidth|BWIDth:ALTernate<channel>
on page 214
Statistics
Opens a submenu to display statistics measurement results.
CCDF ← Statistics
Sets the CCDF result display.
This result display shows the probability of an amplitude within the gating lines exceed-
ing the mean power measured between the gating lines. The x-axis displays power relative to the measured mean power.
If the gate start or gate length are altered then the results can be updated to reflect
these changes by pressing the Refresh softkey in the "Sweep" menu.
●
IEEE 802.16-2004 OFDM
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●
IEEE 802.16e-2005 OFDMA/WiBro
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Remote command:
CONFigure:BURSt:STATistics:CCDF[:IMMediate] on page 161
Bitstream ← Statistics
Sets the Bitstream result display.
●
IEEE 802.16-2004 OFDM
This result display shows the demodulated data stream. These results are grouped
by burst and symbol. If no dialog boxes are displayed, the results can be scrolled
through using the cursor keys or rotary knob.
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●
IEEE 802.16e-2005 OFDMA/WiBro
This result display shows the modulation symbols of the bursts from the analyzed
zone. The different modulation formats are displayed in unique colors. The same
color assignment is used in the Constellation vs Symbol result display. The modulation symbols define bit sequences. The mapping is defined in the standard. Signals with erroneous pilot sequences (i.e where the detected pilot sequence does
not match that according to the standard) are highlighted with a red background.
The amount of data displayed in the Bitstream result display can be reduced via
the Bit Selection (IEEE 802.16e-2005 OFDMA/WiBro) softkey.
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Remote command:
CONFigure:BURSt:STATistics:BSTReam[:IMMediate] on page 159
Burst Summary ← Statistics
This result display shows the summary data for the analyzed bursts. If no dialog boxes
are displayed, the results can be scrolled through using the cursor keys or rotary knob.
●
IEEE 802.16-2004 OFDM
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●
IEEE 802.16e-2005 OFDMA/WiBro
This result display provides information about the bursts from the analyzed zone, i.e.
modulation of the burst, power boosting information, EVM of the burst. Each analyzed
zone will produce a set of burst results.
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FSV-K93)
Remote command:
CONFigure:BURSt:STATistics:BSUMmary[:IMMediate] on page 161
Bit Selection (IEEE 802.16e-2005 OFDMA/WiBro) ← Statistics
Opens a dialog box for filtering the displayed results. The results may be filtered by any
combination of modulation, symbol or burst. If the bit selection parameters are
changed, the result display is updated accordingly.
This softkey is only available if the Bitstream measurement ( Bitstream softkey) is
selected.
Remote command:
CONFigure:BURSt:STATistics:BSTReam:SYMBol:SELect on page 160
CONFigure:BURSt:STATistics:BSTReam:FORMat:SELect on page 160
CONFigure:BURSt:STATistics:BSTReam:BURSt:SELect on page 159
File Manager (IEEE 802.16e-2005 OFDMA/WiBro)
Opens the "File Manager" dialog box. The File Manager allows you to to transfer
WiMAX settings from an R&S SMU signal generator via LAN. For step-by-step instructions see chapter 4.2.5, "Transfering the Current R&S SMU WiMAX Settings via LAN",
on page 44 . The File Manager also offers some general file management support.
The File Manager writes into the directory C:\R_S\Instr\user\WMAN and its subdirectories or a USB memory stick only.
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Under "File Types", filter the displayed files by selecting:
All (*.*) All file types are displayed. Use this selection to perform general file manage-
ment tasks.
SMU WiMax Only files with the extension WiMAX are displayed.
Depending on the focus, the following softkeys are provided:
●
Recall
●
New Folder
●
Copy
●
Paste
●
Rename
●
Delete File
To close the File Manager, press ESC.
For further information refer to the description of the SAVE/RCL key in the base unit.
Remote command:
chapter 5.14, "MMEMory Subsystem (WiMAX / WiBro, K93)", on page 203
4.3.2 General Settings Dialog Box
In the "General Settings" dialog box, all settings related to the overall measurement
can be modified. The tab with the advanced settings is only displayed if the "Advanced
Settings" option is activated. The "General Settings" dialog box contains the following
elements:
General Settings........................................................................................................... 85
└ Standard......................................................................................................... 85
└ Frequency.......................................................................................................85
└ Channel No (IEEE 802.16-2004 OFDM).........................................................85
└ Frequency Band..............................................................................................86
└ FFT Size N
(IEEE 802.16e-2005 OFDMA/WiBro)......................................86
FFT
└ Channel BW....................................................................................................86
└ Fs/BW............................................................................................................. 86
└ Sample Rate................................................................................................... 86
└ G = Tg/Tb.........................................................................................................86
└ Signal Level.................................................................................................... 86
└ Auto Level.......................................................................................................86
└ Ext Att............................................................................................................. 87
└ Capture Time.................................................................................................. 87
└ Burst Count (IEEE 802.16-2004 OFDM).........................................................87
└ Analyze Bursts (IEEE 802.16-2004 OFDM)....................................................87
└ Capture Count (IEEE 802.16e-2005 OFDMA/WiBro).....................................87
└ No. Subframes (IEEE 802.16e-2005 OFDMA/WiBro).................................... 88
└ Sweep Time....................................................................................................88
└ Sweep Count.................................................................................................. 88
└ Trigger Mode...................................................................................................88
└ Trigger Offset..................................................................................................89
└ Trigger Holdoff................................................................................................ 89
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└ Trigger Hysteresis...........................................................................................89
└ Power Level.................................................................................................... 89
└ Power Level Auto............................................................................................89
Advanced Settings........................................................................................................ 89
└ Swap IQ (IEEE 802.16-2004 OFDM)..............................................................89
└ Input................................................................................................................90
└ Baseband Settings..........................................................................................90
└ Input Sample Rate................................................................................90
└ Full Scale Level.................................................................................... 90
└ Auto Level.......................................................................................................90
└ Auto Track Time..............................................................................................90
└ Ref Level.........................................................................................................91
└ RF Att..............................................................................................................91
└ RSSI, CINR avg..............................................................................................91
└ List Results Unit..............................................................................................91
└ Measure Capture Buffer to ….........................................................................91
└ SMU Address (IEEE 802.16e-2005 OFDMA/WiBro)...................................... 91
General Settings
This tab contains the general measurement settings.
FSV-K93)
Standard ← General Settings
Displays a list of all installed standards to select the WiMAX/WiBro standard. This is
necessary to ensure that the measurements are performed according to the specified
standard with the correct limit values and limit lines.
Remote command:
CONFigure:STANdard on page 163
Frequency ← General Settings
Specifies the center frequency of the signal to be measured. If the frequency is modified, the "Channel No" field is updated accordingly.
Remote command:
[SENSe:]FREQuency:CENTer on page 213
Channel No (IEEE 802.16-2004 OFDM) ← General Settings
Specifies the channel to be measured. If the "Channel No" field is modified, the center
frequency is derived according to the section in the standard mentioned below and
updated.
●
For the Licensed Bands {ETSI, MMDS, WCS}:
Channel numbers are supported according to IEEE Std 802.16-2004 "8.3.10.2
Transmitter channel bandwidth and RF carrier frequencies''. For the target frequency bands see IEEE Std 802.16-2004 "B.1 Targeted frequency bands''.
●
For the License Exempt Bands {U-NII, CEPT}:
Channel numbers are supported according to IEEE Std 802.16-2004 "8.5.1 Channelization''.
Remote command:
CONFigure:CHANnel on page 162
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Frequency Band ← General Settings
Specifies the relationship between the "Channel BW" on page 86 and the "Sample
Rate" on page 86 parameters.
Remote command:
CONFigure:WIMax:FBANd on page 165
FFT Size N
(IEEE 802.16e-2005 OFDMA/WiBro) ← General Settings
FFT
Specifies the maximum number of carriers supported by the signal to be measured.
Remote command:
CONFigure:WIMax:NFFT on page 170
Channel BW ← General Settings
Specifies the bandwidth of the channel to be measured.
Remote command:
[SENSe:]BANDwidth:CHANnel on page 206
Fs/BW ← General Settings
Specifies the ration of the Sample Rate (Fs) to Channel Bandwidth (BW). This ration
can either be set to auto (as specified by the selected standard), or manually specified.
Remote command:
CONFigure:WIMax:FSBWratio:AUTo on page 169
CONFigure:WIMax:FSBWratio:FS on page 169
CONFigure:WIMax:FSBWratio:BW on page 169
Sample Rate ← General Settings
Specifies the sample rate used for IQ measurements.
Remote command:
TRACe:IQ:SRATe on page 230
G = Tg/Tb ← General Settings
Specifies the guard time ratio.
Remote command:
CONFigure:WIMax:IGRatio on page 170
Signal Level ← General Settings
Specifies the expected mean level of the RF input signal. If an automatic level detection measurement has been executed the signal level (RF) is updated.
Remote command:
CONFigure:POWer:EXPected:RF on page 163
Auto Level ← General Settings
Activates or deactivates the automatic setting of the reference level for measurements.
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"ON"
Softkeys of the WiMAX, WiBro Menu (R&S
The reference level is measured automatically at the start of each
measurement sweep. This ensures that the reference level is always
set at the optimal level for obtaining accurate results but will result in
slightly increased measurement times. For details about automatic
level detection refer to chapter 3.1.2, "Performing the Level Detec-
tion", on page 14.
"OFF"
The reference level is defined manually in the "Signal Level"
on page 86 field.
Remote command:
CONFigure:POWer:AUTO on page 162
CONFigure:POWer:AUTO:SWEep:TIME on page 162
Ext Att ← General Settings
Specifies the external attenuation or gain applied to the RF signal. A positive value
indicates attenuation, a negative value indicates gain. All displayed power level values
are shifted by this value.
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel:OFFSet on page 187
Capture Time ← General Settings
Specifies the time (and therefore the amount of data) to be captured in a single measurement sweep.
Remote command:
[SENSe:]SWEep:TIME on page 222
Burst Count (IEEE 802.16-2004 OFDM) ← General Settings
Activates or deactivates a specified number of bursts for capture and analysis.
On The data analysis is performed over a number of consecutive sweeps until the required number
of bursts has been captured and analyzed.
Off The data analysis is performed on a single measurement sweep.
Remote command:
[SENSe:]BURSt:COUNt:STATe on page 207
Analyze Bursts (IEEE 802.16-2004 OFDM) ← General Settings
Specifies the number of bursts to be measured, if the "Burst Count (IEEE 802.16-2004
OFDM)" on page 87 option is activated.
If the number of bursts of the specified type is not contained in a single measurement
sweep, the measurement sweeps continue until the requested number of bursts have
been captured.
Remote command:
[SENSe:]ZONE:COUNt:STATe on page 224
Capture Count (IEEE 802.16e-2005 OFDMA/WiBro) ← General Settings
Specifies whether a specified number of subframes are to be captured and analyzed.
If deactivated, data analysis is performed on a single measurement sweep.
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If activated, data analysis is performed over a number of consecutive sweeps until the
required number of subframes (see "No. Subframes (IEEE 802.16e-2005 OFDMA/
WiBro)" on page 88) have been captured and analyzed.
Remote command:
[SENSe:]ZONE:COUNt:STATe on page 224
No. Subframes (IEEE 802.16e-2005 OFDMA/WiBro) ← General Settings
Specifies the number of subframes to be measured. If the specified number of subframes are not contained in a single measurement sweep, then measurement sweeps
will continue to be performed until the requested number of subframes have been captured.
This setting is only available if "Capture Count (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 87is activated.
Remote command:
[SENSe:]ZONE:COUNt on page 224
Sweep Time ← General Settings
Specifies the sweep time for the Spectrum Mask and Spectrum ACP/ACPR measurements:
●
If the "Auto" option is activated, the sweep time is calculated automatically.
●
If the "Auto" option is deactivated, specify the sweep time.
Remote command:
[SENSe:]SWEep:ACPR:TIME on page 219
[SENSe:]SWEep:ACPR:TIME:AUTO on page 219
FSV-K93)
Sweep Count ← General Settings
Specifies the number of sweeps to be performed for Spectrum ACP/ACPR and Spectrum Mask measurements.
Remote command:
[SENSe:]SWEep:COUNt on page 219
Trigger Mode ← General Settings
Sets the source of the trigger for the measurement sweep.
"Free Run"
"External"
"IF Power"
"RF Power"
"Power Sensor"
Remote command:
TRIGger<n>[:SEQuence]:SOURce on page 241
The measurement sweep starts immediately.
The measurement sweep starts if the external trigger signal meets or
exceeds the external trigger level (a fixed value that cannot be
altered) at the input connector EXT TRIGGER/GATE IN on the rear
panel.
The measurement sweep starts if the signal power meets or exceeds
the specified power trigger level.
The next measurement is triggered by the first intermediate frequency
of the RF signal.
The next measurement is triggered by the external power sensor
(requires R&S FSV-K9 option).
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Trigger Offset ← General Settings
Specifies the time offset between the trigger signal and the start of the sweep. A negative value indicates a pre-trigger. This field is not available in the "Free Run" trigger
mode.
Remote command:
TRIGger[:SEQuence]:HOLDoff on page 238
Trigger Holdoff ← General Settings
Defines the value for the trigger holdoff. The holdoff value in s is the time which must
pass before triggering, in case another trigger event happens.
This softkey is only available if "IFPower", "RF Power" or "BBPower" is the selected
trigger source.
Remote command:
TRIGger<n>[:SEQuence]:IFPower:HOLDoff on page 238
Trigger Hysteresis ← General Settings
Defines the value for the trigger hysteresis for "IF power" or "RF Power" trigger sources. The hysteresis in dB is the value the input signal must stay below the power trigger level in order to allow a trigger to start the measurement. The range of the value is
between 3 dB and 50 dB with a step width of 1 dB.
Remote command:
TRIGger<n>[:SEQuence]:IFPower:HYSTeresis on page 239
Power Level ← General Settings
Specifies the trigger level if one of the "Power" trigger modes is set (see "Trigger
Mode" on page 88 field).
Remote command:
TRIGger[:SEQuence]:LEVel:POWer on page 239
Power Level Auto ← General Settings
Activates or deactivates the automatic measurement of the power trigger level if the "IF
Power" trigger mode is set (see "Trigger Mode" on page 88 field).
On The power trigger level is measured automatically at the start of each measurement sweep.
This ensures that the power trigger level is always set at the optimal level for obtaining accurate results but will result in a slightly increased measurement times.
Off The power trigger level is defined manually in the "Power Level" on page 89 field.
Remote command:
TRIGger[:SEQuence]:LEVel:POWer:AUTO on page 240
Advanced Settings
This tab contains advanced measurement settings.
Swap IQ (IEEE 802.16-2004 OFDM) ← Advanced Settings
Activates or deactivates the inverted I/Q modulation.
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On I and Q signals are interchanged.
Off Normal I/Q modulation.
FSV-K93)
Remote command:
[SENSe:]SWAPiq on page 218
Input ← Advanced Settings
Defines whether "RF" or "Baseband Digital" input is used for measurements.
"Baseband Digital" is only available if option R&S FSV-B17 (Digital Baseband inter-
face) is installed.
For details see the Digital Baseband Interface description in the base unit document.
Baseband Settings ← Advanced Settings
For "IQ Digital" input, the Baseband Settings can be defined here.
Input Sample Rate ← Baseband Settings ← Advanced Settings
Defines the sample rate of the digital I/Q signal source. This sample rate must correspond with the sample rate provided by the connected device, e.g. a generator.
Remote command:
INPut:DIQ:SRATe on page 200
Full Scale Level ← Baseband Settings ← Advanced Settings
The "Full Scale Level" defines the level that should correspond to an I/Q sample with
the magnitude "1".
The level is defined in Volts.
Remote command:
INPut:DIQ:RANGe[:UPPer] on page 200
Auto Level ← Advanced Settings
Activates or deactivates the automatic setting of the reference level for measurements.
"ON"
The reference level is measured automatically at the start of each
measurement sweep. This ensures that the reference level is always
set at the optimal level for obtaining accurate results but will result in
slightly increased measurement times. For details about automatic
level detection refer to chapter 3.1.2, "Performing the Level Detec-
tion", on page 14.
"OFF"
The reference level is defined manually in the "Auto Level"
on page 90 field.
Remote command:
CONFigure:POWer:AUTO on page 162
CONFigure:POWer:AUTO:SWEep:TIME on page 162
Auto Track Time ← Advanced Settings
Specifies the sweep time used for the automatic level measurements.
Remote command:
CONFigure:POWer:AUTO:SWEep:TIME on page 162
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Ref Level ← Advanced Settings
Specifies the reference level to use for measurements. If the reference level is modified, the signal level is updated accordingly (depending on the currently selected standard and measurement type). If you select a reference level manually, the "Auto Level"
on page 90 is deactivated.
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel? on page 186
RF Att. ← Advanced Settings
Specifies the settings for the attenuator. This field is only editable if the "Auto Level"
on page 90 option is deactivated. If the "Auto Level" on page 90 option is activated, the
RF attenuator setting is coupled to the reference level setting.
Remote command:
INPut:ATTenuation on page 199
RSSI, CINR avg. ← Advanced Settings
Specifies the mean and standard deviation for the RSSI and CINR results (see IEEE
Std 802.16-2004 "8.3.9.2 RSSI mean and standard deviation'', "8.3.9.3 CINR mean
and standard deviation'').
Remote command:
CONFigure:WIMax:AVERaging on page 163
FSV-K93)
List Results Unit ← Advanced Settings
Specifies the units for the results in the results summary table.
Remote command:
UNIT:TABLe on page 242
Measure Capture Buffer to … ← Advanced Settings
The "Capture Memory" display provides the "Time to Capture Buffer Start" measurement. This measurement can be performed in 2 different modes.
●
For "Measure Capture Buffer to FFT Start", the "Time to Capture Buffer Start" measurement shows the time between the capture buffer start and the FFT start of the
first ofdm symbol from the analyzed subframe. For an ideal channel, the FFT start
sample is the sample in the center of the cyclic prefix.
●
For "Measure Capture Buffer to Frame Start", the "Time to Capture Buffer Start"
measurement shows the time between the capture buffer start and the first sample
of the first ofdm symbol from the analyzed subframe. This is hold for an ideal channel.
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:TTCapture:STARt on page 146
SMU Address (IEEE 802.16e-2005 OFDMA/WiBro) ← Advanced Settings
Specifies the TCP/IP address of an external R&S SMU signal generator connected via
TCP/IP. This enables the R&S FSVR to download the frame zone setup directly.
Remote command:
SYSTem:COMMunicate:TCPip:ADDRess on page 228
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4.3.3 Demod Settings Dialog Box
In the "Demod Settings" dialog box, the settings associated with the signal modulation
can be modified. The content of the "Demod Settings" dialog box depends on the
selected standard:
●
IEEE 802.16-2004 OFDM
The settings under "Burst to Analyze" specify the characteristics of the bursts to be
considered in the measurement results. Only the bursts which meet the criteria
specified in this group will be included in measurement analysis. The settings
under "Tracking" allow various errors in measurement results to be compensated
for.
For IEEE 802.16-2004 OFDM, the "Demod Settings" dialog box contains the following elements:
Group Setting
Burst to Analyze "Link Mode (IEEE 802.16-2004 OFDM)" on page 94
"Use FCH Content (IEEE 802.16-2004 OFDM)" on page 94
"Mod. Detection (IEEE 802.16-2004 OFDM)" on page 94
"Demodulator (IEEE 802.16-2004 OFDM)" on page 95
"Subchannelization (IEEE 802.16-2004 OFDM)" on page 95
"UL Phys. Modifier (IEEE 802.16-2004 OFDM)" on page 95
"Equal Burst Length (IEEE 802.16-2004 OFDM)" on page 95
"Min Data Symbols (IEEE 802.16-2004 OFDM)" on page 96
"Max Data Symbols (IEEE 802.16-2004 OFDM)" on page 96
"Channel Estimation (IEEE 802.16-2004 OFDM)" on page 96
Tracking "Phase" on page 96
"Timing" on page 96
"Level" on page 96
●
IEEE 802.16e-2005 OFDMA/WiBro
The "Demod Settings" dialog box contains three tabs. Use the left/right arrow keys
to navigate between the tabs.
On the "Demod Settings" tab, the channel estimation range is set. The settings
under "Bursts to Analyze" specify the characteristics of the bursts to be considered
in the measurement results. The settings under "Tracking" allow various errors in
measurement results to be compensated for.
On the "Frame Global" tab, the common settings associated with the frame to be
analyzed can be modified.
On the "Frame Config" tab, the settings associated with the frame configuration
can be modified. The "Zone/Segment List" and the "Burst List" are displayed. The
content of the selected list is graphically displayed under the "Zone/Segment Map"
and the "Burst Map", respectively. To edit the "Frame Config" tab, softkeys are
available (see the table below).
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For IEEE 802.16e-2005 OFDMA/WiBro the "Demod Settings" dialog box contains
the following elements:
Group Setting
"Demod Settings"
Channel Estimation Range "Downlink (DL) (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 97
"Uplink (UL) (IEEE 802.16e-2005 OFDMA/WiBro)" on page 97
Bursts to Analyze "Burst Boosting (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 97
Tracking Settings "Phase" on page 96
"Timing" on page 96
"Level" on page 96
"Channel Est. based on (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 97
"Pilots for Tracking (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 98
Advanced "FFT Start Offset (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 98
"Frame Global"
Frame "Use for analysis (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 98
"File Name (IEEE 802.16e-2005 OFDMA/WiBro)" on page 99
"IDCell (IEEE 802.16e-2005 OFDMA/WiBro)" on page 99
DL Subframe "Preamble Mode (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 99
"Preamble Index (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 100
"Used Subchannel Bitmap (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 100
UL Subframe "UL Control Region Len (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 100
"Frame Number (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 100
"Allocated Subchannel Bitmap (IEEE 802.16e-2005 OFDMA/
WiBro)" on page 100
The settings in the "Frame Config" tab are defined using the following softkeys:
"List Zone/Burst (IEEE 802.16e-2005 OFDMA/WiBro)" on page 101
"Copy Zone/Burst (IEEE 802.16e-2005 OFDMA/WiBro)" on page 104
"Insert Zone/Burst (IEEE 802.16e-2005 OFDMA/WiBro)" on page 104
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"New Zone/Burst (IEEE 802.16e-2005 OFDMA/WiBro)" on page 104
"New Segment (IEEE 802.16e-2005 OFDMA/WiBro)" on page 104
"Delete Zone/Burst (IEEE 802.16e-2005 OFDMA/WiBro)" on page 105
"File Manager (IEEE 802.16e-2005 OFDMA/WiBro)" on page 83
FSV-K93)
Demod Settings tab
This tab contains general demodulation settings.
Link Mode (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Specifies the link mode of bursts that are to be included in measurement analysis. The
following link mode types are supported:
UL Up Link
DL Down Link
Remote command:
CONFigure:WIMax:LMODe on page 170
Use FCH Content (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Activates or deactivates the decoding of the captured burst data FCH field.
OFF This is the default setting and cannot be altered currently.
ON Only the bursts with a modulation format matching the format specified in the "Demodula-
tor" list are included in the results analysis.
Mod. Detection (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Specifies the demodulation of the signal. The following values are supported:
None No modulation detection is performed. The signal will be analyzed according to the
"Demodulator" setting. Therefore the "Demodulator" setting must match with the
modulation format of the subframe. This setting excludes the analysis of multiple
modulation formats in a subframe.
First Symbol The first data symbol specifies the modulation format, i.e. the signal will be analyzed
according to the modulation format of the first data symbol. This setting supports
multiple modulation formats in a subframe.
If "First Symbol" is selected, the "Demodulator" setting is disabled and is automatically updated with the modulation scheme detected in the first symbol.
USER Only bursts matching the setting in the "Demodulator" list are analyzed. This setting
supports multiple modulation formats in a subframe.
All All bursts individual payload modulations are analyzed accordingly. This setting is
useful to get an overview of the signal content.
Remote command:
[SENSe:]DEMod:FORMat[:BCONtent]:AUTo on page 211
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Demodulator (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Defines the modulation format for signal analysis if the Mod. Detection is set to None
or User (see "Link Mode (IEEE 802.16-2004 OFDM)" on page 94 field).
The measurement application does not distinguish between different coding rates for
the same modulation format. If the signal to be analyzed contains the profiles (modulation format A, coding rate B) and (modulation format C, coding rate D), the signal to be
analyzed must hold the following condition in order to produce correct measurement
results:
[A == C ⇒ B == D]
Remote command:
[SENSe:]DEMod:FORMat:BANalyze on page 209
Subchannelization (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Activates or deactivates the subchannelization, if the "Up Link" mode is set (see "Link
Mode (IEEE 802.16-2004 OFDM)" on page 94 field). If activated, the subchannel index
of uplink bursts is analyzed, defined by the "Index (IEEE 802.16-2004 OFDM)"
on page 95 field.
Remote command:
[SENSe:]SUBChannel:STATe on page 218
Index (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Defines the subchannelization index of uplink bursts to be analyzed. Subchannelization
index 16 is the default subchannel with full occupation.
Remote command:
[SENSe:]SUBChannel on page 217
UL Phys. Modifier (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Specifies a common UL physical modifier for all uplink bursts.
Remote command:
[SENSe:]SUBChannel:ULPHysmod on page 218
Equal Burst Length (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Activates or deactivates the burst selection for measurement analysis according to the
range or specific number of data symbols/bytes.
On Only bursts with exactly the number of symbols specified in the "Data Symbols (IEEE
802.16-2004 OFDM)" on page 96 field are considered for measurement analysis.
Off Only bursts within the range of data symbols specified by the "Min Data Symbols (IEEE
802.16-2004 OFDM)" on page 96 and "Max Data Symbols (IEEE 802.16-2004 OFDM)"
on page 96 fields are considered for measurement analysis.
Remote command:
[SENSe:]DEMod:FORMat:BANalyze:SYMBols:EQUal on page 210
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Data Symbols (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Specifies the number of symbols that a burst must have to be considered for measurement analysis. This field is only available if the "Equal Burst Length (IEEE 802.16-2004
OFDM)" on page 95 option is activated.
Remote command:
[SENSe:]DEMod:FORMat:BANalyze:SYMBols:MIN on page 211
Min Data Symbols (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Specifies the minimum number of data symbols that a burst must have to be considered in measurement analysis. This field is only available if the "Equal Burst Length
(IEEE 802.16-2004 OFDM)" on page 95 option is deactivated.
Remote command:
[SENSe:]DEMod:FORMat:BANalyze:SYMBols:MIN on page 211
Max Data Symbols (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Specifies the maximum number of data symbols that a burst must have to be considered in measurement analysis. This field is only available if the "Equal Burst Length
(IEEE 802.16-2004 OFDM)" on page 95 option is deactivated.
Remote command:
[SENSe:]DEMod:FORMat:BANalyze:SYMBols:MAX on page 210
Channel Estimation (IEEE 802.16-2004 OFDM) ← Demod Settings tab
Specifies how accurately the EVM results are calculated.
Preamble The channel estimation is performed in the preamble as required in the standard.
Payload The channel estimation is performed in the payload.
Remote command:
[SENSe:]DEMod:CESTimation on page 207
Phase ← Demod Settings tab
Activates or deactivates the compensation for the phase error. If activated, the measurement results are compensated for phase error on a per-symbol basis.
Remote command:
[SENSe:]TRACking:PHASe on page 223
Timing ← Demod Settings tab
Activates or deactivates the compensation for the timing error. If activated, the measurement results are compensated for timing error on a per-symbol basis.
Remote command:
[SENSe:]TRACking:TIME on page 223
Level ← Demod Settings tab
Activates or deactivates the compensation for the level error. If activated, the measurement results are compensated for level error on a per-symbol basis.
Remote command:
[SENSe:]TRACking:LEVel on page 222
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Downlink (DL) (IEEE 802.16e-2005 OFDMA/WiBro) ← Demod Settings tab
Specifies how channel estimation is performed for downlink signals.
Preamble Only The channel estimation is performed in the preamble only.
Preamble and Payload The channel estimation is performed in the preamble and in the payload
(payload comprises pilots and data).
Payload Only The channel estimation is performed in the payload only.
Remote command:
[SENSe:]DEMod:CESTimation on page 207
Uplink (UL) (IEEE 802.16e-2005 OFDMA/WiBro) ← Demod Settings tab
Displays the channel estimation performed for uplink signals.
This field is for information purposes only as channel estimation for uplink signals are
always performed in payload only (payload comprises pilots and data).
Burst Boosting (IEEE 802.16e-2005 OFDMA/WiBro) ← Demod Settings tab
specifies how the information about the burst boosting factors is derived.
"Predefined"
"Estimated"
The burst boosting factors are taken from the "Frame Config" dialog.
The measurement application estimates the burst boosting factors
from the signal to be analyzed.
Remote command:
CONFigure:BURSt:BOOSting on page 150
Modulation Analysis Scope (IEEE 802.16e-2005 OFDMA/WiBro) ← Demod Settings tab
Displays the modulation formats to be analyzed.
This field is for information purposes only as all detected modulation schemes are ana-
lyzed.
Demodulator (IEEE 802.16e-2005 OFDMA/WiBro) ← Demod Settings tab
Displays the modulation scheme detected in the analyzed signal. For signals using
multiple modulation schemes, the modulation scheme with the highest data rate is displayed. The field also indicates the limits that are applied to the EVM results in the
table or results.
This field is for information purposes only.
Remote command:
[SENSe:]DEMod:FORMat:BANalyze on page 209
Channel Est. based on (IEEE 802.16e-2005 OFDMA/WiBro) ← Demod Settings tab
This setting is used to specify if the processing of the Channel Estimation uses the
user-selected Phase, Timing and Level settings or whether these settings are determined by the DSP, in which case all tracking options are used.
Remote command:
[SENSe:]DEMod:CESTimation on page 207
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Pilots for Tracking (IEEE 802.16e-2005 OFDMA/WiBro) ← Demod Settings tab
Specifies how, for downlink signals, the pilot sequence is determined for tracking purposes.
For uplink signals, this field is for information purposes only as tracking is performed
according to the selected standard.
According to Standard The pilot sequence is computed according to the standard.
Detected The pilot sequence uses the values detected in the signal.
Remote command:
[SENSe:]TRACking:PILot on page 223
FFT Start Offset (IEEE 802.16e-2005 OFDMA/WiBro) ← Demod Settings tab
Adds an offset to the FFT starting point determined by the application.
The setting range is from -100 % to +100 % of the cyclic prefix (CP) length. In the case
of 0 %, the optimal FFT starting point, determined by the application, is used. This is
the default setting.
Remote command:
[SENSe:]FFT:OFFSet on page 212
Rel to CP Cntr (IEEE 802.16e-2005 OFDMA/WiBro) ← Demod Settings tab
Indicates the number of samples the offset corresponds to, relative to the center of the
cyclic prefix (CP).
Remote command:
[SENSe:]FFT:OFFSet on page 212
Frame Global tab
This tab contains global frame settings.
Use for analysis (IEEE 802.16e-2005 OFDMA/WiBro) ← Frame Global tab
The option specifies whether the analysis should be performed using the current userdefined configuration, or whether automatic determination of the frame configuration
should be performed.
Automatic detection of the frame configuration requires several measurement parameters to be correctly configured:
●
Frequency
●
Sample Rate/Channel Bandwidth
●
FFT size
●
Guard Time
●
IDCell
●
Preamble Index (if not in the range 0 – 96)
Note: Loading a WiMAX file automatically sets "Predefined MAP".
"Predefined
Uses the current user-defined configuration
MAP"
"Auto Demod
DL-MAP"
Performs an additional initial sweep to determine the configuration
from the downlink signal.
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R&S® FSV-K93
Instrument Functions WiMAX, WiBro Measurements (R&S FSV-K93)
Softkeys of the WiMAX, WiBro Menu (R&S
"Auto Demod
UL-MAP/PHY
Det."
Remote command:
[SENSe:]DEMod:FORMat[:BCONtent]:AUTo on page 211
Analyze Zone ← Use for analysis (IEEE 802.16e-2005 OFDMA/WiBro) ← Frame
Global tab
This setting is only available if "Use for analysis (IEEE 802.16e-2005 OFDMA/WiBro)"
on page 98 is set to auto demodulation. It allows any zone to be analyzed which is
available in the signal. In case the specified zone is not available in the signal, the
zone to be analyzed is adjusted to the last available zone in the signal.
Remote command:
CONFigure:WIMax:FRAMe:ZONetouse on page 168
Uplink signals can be analysed without knowledge about the ULMAP. The following signals can be measured with auto demodulation
detection:
●
A single UL-PUSC data burst.
●
A single data burst to the right of a specified control region. The
control region itself is ignored. It is specified via the UL Control
Region Length field.
Selecting "Auto Demod UL-MAP/PHY Det." automatically sets "Pilots
for Tracking" (in "Demod Settings") to "Detected" (see "Pilots for
Tracking (IEEE 802.16e-2005 OFDMA/WiBro)" on page 98).
After a successful auto demod measurement the "Frame Config" dialog contains the frame configuration according to the parameters
detected in the signal.
FSV-K93)
File Name (IEEE 802.16e-2005 OFDMA/WiBro) ← Frame Global tab
Displays the name of the loaded *.WIMAX settings file. If no file is loaded the '….' is
displayed.
This field is for information purposes only.
IDCell (IEEE 802.16e-2005 OFDMA/WiBro) ← Frame Global tab
Specifies the downlink IDCell number and affects the definition of the preamble
sequence (in conjunction with the used segments according to the "Used Subchannel
Bitmap (IEEE 802.16e-2005 OFDMA/WiBro)" on page 100 setting), the pilot sequence
of the first zone and the subchannel definition of the first zone.
If "AUTO" is selected, the IDcell is determined from the signal by the application.
Remote command:
CONFigure:WIMax:DLSFrame:IDCell on page 164
Preamble Mode (IEEE 802.16e-2005 OFDMA/WiBro) ← Frame Global tab
Specifies how the preamble index is calculated.
99Operating Manual 1176.7655.02 ─ 03.1
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R&S® FSV-K93
Instrument Functions WiMAX, WiBro Measurements (R&S FSV-K93)
Softkeys of the WiMAX, WiBro Menu (R&S
Auto The preamble index is automatically calculated according to the "IDCell (IEEE
802.16e-2005 OFDMA/WiBro)" on page 99 and "Used Subchannel Bitmap (IEEE
802.16e-2005 OFDMA/WiBro)" on page 100 parameters.
USER The preamble index can be specified manually, i.e. the preamble pattern is chosen
according to the standard using the "Preamble Index (IEEE 802.16e-2005 OFDMA/
WiBro)" on page 100 parameter.
FSV-K93)
Remote command:
CONFigure:WIMax:DLSFrame:PREamble:MODe on page 164
Preamble Index (IEEE 802.16e-2005 OFDMA/WiBro) ← Frame Global tab
Specifies the preamble pattern (according to the standard) to be used, if the "Preamble
Index (IEEE 802.16e-2005 OFDMA/WiBro)" on page 100 parameter is set to USER.
Remote command:
CONFigure:WIMax:DLSFrame:PREamble:INDex on page 164
Used Subchannel Bitmap (IEEE 802.16e-2005 OFDMA/WiBro) ← Frame Global
tab
Assigns subchannel groups to segments, see [802.16e-2005], page 360, table 268a
"Subchannel index of the six subchannel groups". This table defines how many subchannels are available for the "Burst List" ("Frame Config" tab) belonging to the corresponding segment of a DL-PUSC zone (with Use All Subchannels being false). In the
burst list – corresponding to the segment – this selection controls the height of the
white area in the burst map.
Remote command:
CONFigure:WIMax:DLSFrame:SEGMent<1…3> on page 165
UL Control Region Len (IEEE 802.16e-2005 OFDMA/WiBro) ← Frame Global tab
UL Control Region Length specifies the length, in symbols, of a control region to be
found at the start of any UL zone.
The control region will not be analysed, but the length must be specified to allow synchronisation.
Remote command:
CONFigure:WIMax:ULSFrame:CRLength on page 171
Frame Number (IEEE 802.16e-2005 OFDMA/WiBro) ← Frame Global tab
Specifies the number of the frame to be analyzed. For UL subframe analysis, the frame
number must be constant for the signal to be analyzed.
Remote command:
CONFigure:WIMax:ULSFrame:FRAMe on page 172
Allocated Subchannel Bitmap (IEEE 802.16e-2005 OFDMA/WiBro) ← Frame
Global tab
Specifies the subchannels to be analyzed.
This parameter is for information purposes only as all subchannels are used in the UL
subframe.
100Operating Manual 1176.7655.02 ─ 03.1
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