Rohde&Schwarz R&S®WinIQSIM2™ Digital Standardss User Manual
R&S®AFQ100B-K264
Digital Standard ECMA-368 IEEE
802.15 3a (Ultra Wide Band)
Operating Manual
(;ÕÈè<)
1171.5890.12 ─ 06
Operating Manual
Test & Measurement
This document describes the following software options:
●
R&S®AFQ100B-K264
1410.8504.02
© 2018 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 their owners.
The following abbreviations are used throughout this manual: R&S®AFQ is abbreviated as R&S AFQ, R&S®WinIQSIM2TM is abbrevi-
ated as R&S WinIQSIM2
R&S®AFQ100B-K264
Contents
1 Preface.................................................................................................... 5
1.1 Documentation Overview............................................................................................. 5
1.2 Typographical Conventions.........................................................................................6
1.3 Notes on Screenshots.................................................................................................. 6
2 Introduction............................................................................................ 7
2.1 Physical Layer MB-OFDM.............................................................................................7
2.1.1 Band Groups................................................................................................................... 7
2.1.2 Band Hopping................................................................................................................. 8
2.1.3 UWB MB-OFDM Parameters.......................................................................................... 8
2.1.4 Transport Modes........................................................................................................... 10
Contents
2.2 UWB MB-OFDM Frame Structure and PPDU Format...............................................11
2.2.1 PLCP Preamble............................................................................................................ 12
2.2.2 PLCP Header................................................................................................................ 12
2.2.3 PSDU............................................................................................................................ 12
2.3 Protection.................................................................................................................... 12
2.3.1 Data Scrambler............................................................................................................. 13
2.3.2 Convolutional Encoder.................................................................................................. 13
2.3.3 Bit Interleaving.............................................................................................................. 13
2.3.4 Constellation Mapping and OFDM Modulator............................................................... 14
3 UWB MB-OFDM Configuration and Settings..................................... 15
3.1 General Settings..........................................................................................................16
3.2 PPDU Configuration Settings.................................................................................... 22
3.2.1 PSDU............................................................................................................................ 23
3.2.2 PLCP Preamble and PLCP Header.............................................................................. 25
3.2.3 PPDU Graph................................................................................................................. 28
3.3 MAC Header Settings..................................................................................................28
3.4 Resampling/Clipping Settings................................................................................... 36
3.4.1 Resampling................................................................................................................... 36
3.4.2 Clipping......................................................................................................................... 37
3.5 Marker Settings........................................................................................................... 39
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4 Remote-Control Commands............................................................... 41
4.1 General Commands.................................................................................................... 41
4.2 Clipping Settings.........................................................................................................48
4.3 Marker Settings........................................................................................................... 50
4.4 PPDU Settings............................................................................................................. 53
List of Commands................................................................................65
Index......................................................................................................67
Contents
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1 Preface
Preface
Documentation Overview
1.1 Documentation Overview
This section provides an overview of the R&S WinIQSIM2 user documentation. You
find it on the product page at:
www.rohde-schwarz.com/manual/winiqsim2
Online help
Offers quick, context-sensitive access to the complete information for the base unit and
the software options directly on the instrument.
User manual
Separate manuals for the base unit and the software options are provided for download:
●
Base unit manual
Contains the description of all software modes and functions. It also provides an
introduction to remote control, a complete description of the remote control commands with programming examples, and information on maintenance and error
messages.
●
Software option manual
Contains the description of the specific functions of an option. Basic information on
operating the R&S WinIQSIM2 is not included.
The online version of the user manual provides the complete contents for immediate
display on the Internet.
Basic safety instructions
Contains safety instructions, operating conditions and further important information.
The printed document is delivered with the instrument.
Data sheet and brochure
The data sheet contains the technical specifications of the software options, see "Digital Standards for Signal Generators - Data sheet" on the web site. It also lists the
options and their order numbers.
The brochure provides an overview of the instrument and deals with the specific characteristics.
Release notes and open source acknowledgment (OSA)
The release notes of the base unit list new features, improvements and known issues
of the current software version, and describe the software installation.
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The open source acknowledgment document provides verbatim license texts of the
used open source software. See the product page of the base unit, e.g. at:
www.rohde-schwarz.com/software/winiqsim2
Application Notes, Application Cards, White Papers, etc.
These documents deal with special applications or background information on particular topics, see www.rohde-schwarz.com/application/winiqsim2.
Preface
Notes on Screenshots
1.2 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-
1.3 Notes on Screenshots
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.
When describing the functions of the product, we use sample screenshots. These
screenshots are meant to illustrate as much as possible of the provided functions and
possible interdependencies between parameters. The shown values may not represent
realistic usage scenarios.
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.
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2 Introduction
The R&S WinIQSIM2 enables you to generate UWB MB-OFDM signals in accordance
with the "WiMedia Alliance" and "MultiBand OFDM Alliance Unapproved Release Candidate Version 1.2".
A brief description of the standard is given in the following. For a detailed description,
see the corresponding"WiMedia Alliance" and "MultiBand OFDM Alliance" specifications.
The R&S WinIQSIM2 simulates UWB MB-OFDM at the physical layer. A sequence of
data packets with the frame structure defined by the standard is generated. A MAC
header can be activated.
The following list gives an overview of the key feature provided by the R&S WinIQSIM2
for generating a UWB MB-OFDM signal:
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●
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Introduction
Physical Layer MB-OFDM
Physical Layer mode MB-OFDM
Data rates 53.3 Mbps, 80 Mbps, 106.7 Mbps, 160 Mbps, 200 Mbps, 320 Mbps, 400
Mbps, 480 Mbps
Modulation according to the standard:
– QPSK for data rates from 53.3 Mbps to 200 Mbps
– DCM for data rates from 320 Mbps to 480 Mbps
Support of all standard compliant time frequency codes (TFC1 to TFC10), as well
as configuration of user-definable hopping sequences.
Generation of frames for both standard frame and burst mode
Standard compliant and user-definable cover synchronization sequence, minimum
and short inter-frame spacing interval duration for both burst and standard mode
Data scrambling, bit interleaving and convolutional encoding can be activated or
deactivated.
Clipping for reducing the crest factor.
2.1 Physical Layer MB-OFDM
In the MB-OFDM ("Multiband Orthogonal Frequency Division Multiplexing") approach,
the available spectrum of 7.5 GHz (3100...10600 MHZ) is divided into 14 bands, 528
MHz each. The information transmitted on each 528 MHz band is modulated using
OFDM. OFDM distributes the data over 122 useful subcarriers with 4.125 MHz subcarrier spacing.
2.1.1 Band Groups
To achieve a MB-OFDM, the 528 MHz bands are grouped into 6 band groups as
shown on the figure below.
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Figure 2-1: MB-OFDM Frequency Band Plan
Introduction
Physical Layer MB-OFDM
2.1.2 Band Hopping
A total number of 49 logical channels are achieved with the help of TFCs. For each of
the band group 1, 2, 3, 4 and 6, 10 TFCs are defined. However, only three TFCs are
used in band group 5.
The combination for the band group and TFC defines the band hopping within the
selected band group. The band switching time is 9.47 ns.
Figure 2-2: Band hopping
2.1.3 UWB MB-OFDM Parameters
The table below gives an overview of the main UWB MB-OFDM parameters.
Table 2-1: Parameters of UWB MB-OFDM modulation
Parameters Value
Number of data subcarriers 100
Number of pilot subcarriers 12
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Parameters Value
Total of subcarriers used 122
Subcarrier frequency spacing 4.125 MHz
IFFT/FFT period 242.42 ns
Zero padded suffix duration 70.08 ns
Symbol interval 312.5 ns
Number of samples per zero padding suffix 37
Total number of samples per symbol 165
Symbol rate 3.2 MHz
Subcarrier modulation QPSK (for data rates ≤ 200 Mbps)
Code rates 1/3, 1/2, 5/8, 3/4
A 128 point IFFT is used to generate the 122 subcarriers (12 pilot subcarrier, 110 data
subcarriers and 10 guard subcarriers). Six of the 128 possible carriers are not used
(null subcarrier). One is the carrier in the middle of the band, which would otherwise be
impaired by the carrier leakage of the I/Q modulator. The others are the remaining carriers at the upper and lower end of the spectrum. The figure below shows an example
of the "Band #1" (3168 - 3696 MHz).
Introduction
Physical Layer MB-OFDM
DCM (for data rates > 200 Mbps)
Figure 2-3: Structure of UWB MB-OFDM Signal
The required subcarrier spacing of 4.125 MHz is implicitly observed when the time signal generated by the IFFT with a sampling rate of 528 MHz is output. An OFDM symbol generated in this way would have a period of 242.42 ns. To compensate for multipath propagation, a zero-padded suffix with a duration of 70.08 ns is attached to each
symbol so that a total symbol interval of 312.5 ns is obtained.
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Figure 2-4: OFDM Symbol
Either QPSK or DCM ("Dual Carrier Modulation") modulation can be used on the subcarriers. Before the modulation, the raw data are convolutionally coded with code rates
of 1/3, 1/2 , 5/8 and 3/4 being possible.
Introduction
Physical Layer MB-OFDM
2.1.4 Transport Modes
At the physical level, the standard defines transmission of the frames in two modes, a
standard (single frame) mode and a burst mode.
●
Standard mode
In standard transport mode, a single frame is transmitted.
In this mode, the frames are separated by a SIFS ("Short Inter Frame Spacing")
interval.
Figure 2-5: Standard transport mode
●
Burst mode
A burst of frames forms the same source is transmitted.
The frames in the burst are separated by a minimum inter-frame separation interval
(MIFS).
Figure 2-6: Burst transport mode
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Introduction
UWB MB-OFDM Frame Structure and PPDU Format
2.2 UWB MB-OFDM Frame Structure and PPDU Format
The UWB MB-OFDM frame structure is similar to the frame structure of other wireless
formats, e.g. WLAN, etc.
The table below gives an overview of the UWB MB-OFDM physical parameters, related to the frame structure.
Table 2-2: Frame Structure of UWB MB-OFDM
Parameters Value
PLCP Preamble Length 30 Symbols (standard preamble)
18 Symbols (burst preamble)
PLCP Preamble Duration 9.375 µs (standard preamble)
5.625 µs (burst preamble)
Packet/Farme Synchronization Length 24 Symbols (standard preamble)
12 Symbols (burst preamble)
Channel Estimation Sequence 6 Symbols (standard and burst preamble)
PLCP Header Duration 3.75 µs
PLCP Header Rate 39.4 Mbps
PSDU Data Rate 53.3 Mbps, 80 Mbps, 106.7 Mbps, 160 Mbps, 200 Mbps, 320
Mbps, 400 Mbps, 480 Mbps
PSDU Frame Payload 0(standard preamble)/ 1(burst preamble)...4095 bytes
The data packet on the physical layer is referred to as PPDU (PLCP Protocol Data
Unit).
A PPDU consists of three components:
●
The PLCP (Physical Layer Convergence Protocol) preamble
●
The PLCP header
●
The PSDU ("PLCP Service Data Unit"), which contains the actual information data
(coming from higher layers).
The PLCP preamble and header are used for synchronization and signaling purposes,
and are themselves divided into fields.
The figure below shows the frame structure (also indicated in the "PPDU Configuration" submenu).
Figure 2-7: UWB MB-OFDM Frame Structure
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Introduction
Protection
2.2.1 PLCP Preamble
Each frame starts with the PLCP preamble for time synchronization and channel estimation purposes. There are two PLCP preambles defined, a standard preamble for
frames in standard mode and a burst preamble for frames in burst mode respectively.
The standard PLCP preamble is 9.375 µs long and thus corresponds to the duration of
30 OFDM symbols.
The burst PLCP preamble is 5.625 µs long that corresponds to the duration of 18
OFDM symbols.
Both the standard and the burst preamble can be subdivided into two parts: a packet/
frame synchronization sequence and a channel sequence each created by spreading
an appropriate base sequence with a cover sequence.
2.2.2 PLCP Header
The PLCP Header is sent at 39.4 Mbps and carries information about the data rate, the
data length, the transport mode and preamble type, as well as the MAC Header.
Before scrambling, the PLCP Header is protected with shortened "Read-Solomon"
code (23, 17) and "Header Check Sequence" (x16+x12+x5+1). Tail bits are added to
reset the convolutional encoder to zero.
2.2.3 PSDU
The user data in the data section of the frame is finally taken to the receiver. The data
section can be transmitted with one of the defined data rates between 53.3 Mbps to
480 Mbps. The data section of the frame is subdivided into the fields Payload, FCS
("Frame Check Sequence"), tail and pad bits.
The 6 tail bits are used to reset the convolutional coder to zero. The data field must be
filled with the full number of OFDM symbols and is therefore rounded up. Additional
bits that can be available are set to 0 as pad bits.
2.3 Protection
The R&S Signal Generator simulates UWB MB-OFDM signals in accordance with
ECMA 368 on the physical layer. In the standard, the MAC sublayer provides the input
data for this layer. The following graph illustrates the signal generation process.
12Operating Manual 1171.5890.12 ─ 06
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Figure 2-8: Principle of UWB MB-OFDM signal generation
The scrambled and RS encoded PLCP Header and the scrambled PSDU are subjected to usual signal processing consisting of convolutional coding, interleaving, subcarrier modulation, pilot carrier generation and OFDM modulation.
Introduction
Protection
2.3.1 Data Scrambler
Data from the source (the next higher protocol layer, the MAC) must first be scrambled,
i.e. multiplied with a PN sequence. The standard defines a side-stream scrambler. The
scrambling sequence is given by the following generator polynomial:
g(D)=1+D14+D
15
The start value of the register is determined from the seed identifier contained in the
PLCP Header.
2.3.2 Convolutional Encoder
A subsequent convolutional coder adds redundancies to the bits. The coder uses the
rate R=1/3, has 64 possible states (k = 7) and is described by the polynomials g0=1338,
g1=1658 and g2=1718.
To obtain the data rates of 53.3 Mbps to 480 Mbps defined by the standard, different
channel code rates are required. Bits generated by the convolutional coder are therefore punctured (i.e. omitted) depending on the setting so that 1/2, 1/3, 3/4 or 5/8 code
rates are attained.
Increasing the redundancy by channel coding is mandatory in case of OFDM modulations since complete subcarriers can be eliminated by frequency selective fading so
that the loss of bits on the transmission path is in many cases unavoidable.
The PLCP header always has a data rate of 39.4 Mbps, and is therefore always encoded with rate R=1/3.
2.3.3 Bit Interleaving
To increase the performance of the convolutional coder, the coded data are interleaved
in the next step. Employing frequency diversity within a band and across subcarriers
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and time domain spreading, three interleaver stages ensure robustness against burst
errors.
The adjacent bits of the convolutional coder are first symbol interleaved, i.e. the coded
and padded bit stream is distributed across 6 consecutive OFDM symbols.
The second stage is the inter-symbol tone interleaving, which distributes the bits
across the data subcarrier within one OFDM symbol.
Finally, the bits are cyclically shifted in successive OFDM symbols.
Introduction
Protection
2.3.4 Constellation Mapping and OFDM Modulator
The coded and interleaved data sequence is mapped onto a complex constellation.
The PLCP header is always QPSK-modulated. Depending on the data rate, the useful
carriers are subjected to a QPSK or DCM modulation. For data rates between 53.3
Mbps to 200 Mbps, the data sequence is mapped onto a QPSK constellation. A dualcarrier modulation (DCM) is employed for data with data rates between 320 Mbps to
480 Mbps.
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3 UWB MB-OFDM Configuration and Settings
Access:
► Select "Baseband" > "WLAN Standards" > "UWB MB-OFDM...".
Contents
● General Settings..................................................................................................... 16
● PPDU Configuration Settings..................................................................................22
● MAC Header Settings............................................................................................. 28
● Resampling/Clipping Settings................................................................................. 36
● Marker Settings.......................................................................................................39
UWB MB-OFDM Configuration and Settings
The remote commands required to define these settings are described in Chap-
ter 4, "Remote-Control Commands", on page 41.
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UWB MB-OFDM Configuration and Settings
General Settings
3.1 General Settings
Access:
► Select "Baseband" > "WLAN Standards" > "UWB MB-OFDM...".
This dialog contains the standard general settings, the default and the "Save/
Recall" settings. It enables you to select the sequence, frame and band group
parameters, and provides access to dialogs with further settings.
16Operating Manual 1171.5890.12 ─ 06
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Settings:
State .............................................................................................................................17
Set to default ................................................................................................................ 17
Save/Recall .................................................................................................................. 18
Generate Waveform File… .......................................................................................... 18
UWB MB-OFDM (ECMA-368) Version ........................................................................ 18
Sequence Length ......................................................................................................... 19
Frame Type ..................................................................................................................19
Band Group ..................................................................................................................19
Band Group Graph .......................................................................................................19
TF Code ....................................................................................................................... 19
Hopping Sequence User Defined .................................................................................20
TFC Graph ................................................................................................................... 20
Transport Mode ............................................................................................................20
Inter Frame Spacing Type ............................................................................................21
Inter Frame Spacing Value .......................................................................................... 21
PPDU Configuration .....................................................................................................21
Resampling/Clipping… .................................................................................................22
Marker… ...................................................................................................................... 22
UWB MB-OFDM Configuration and Settings
General Settings
State
Activates the standard and deactivates all the other digital standards and digital modulation modes in the same path.
Remote command:
[:SOURce<hw>]:BB:UWBMb:STATe on page 46
Set to default
Calls the default settings. The values of the main parameters are listed in the following
table.
Parameter Value
State Not affected by "Set to default"
UWB MB-OFDM (ECMA-368) Version Unapproved release Candidate 1.2
Sequence Length 1 Frame
Frame Type Data
Band Group I
TF Code 1
Hopping Sequence User Defined Off
Transport Mode Standard
Inter Frame Spacing Type SIFS
Inter Frame Spacing Value 32 Symbols
Filter Cosine
Clipping Off
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Parameter Value
UWB MB-OFDM Configuration and Settings
General Settings
PPDU Configuration (QPSK, 200 Mbps)
PSDU Data Rate 200 Mbps
PSDU Modulation QPSK
PSDU Data Length 2048 bytes
PSDU Data Source PN9
PLCP Cover Sequence TF Code 1
PLCP Standard Preamble ++++ ++++ ++++ ++++ +---
Scrambler On
Convolutional Encoder On
Bit Interleaver On
MAC Header Off
Remote command:
[:SOURce<hw>]:BB:UWBMb:PRESet on page 44
Save/Recall
Accesses the "Save/Recall" dialog, that is the standard instrument function for storing
and recalling the complete dialog-related settings in a file. The provided navigation
possibilities in the dialog are self-explanatory.
The file name and the directory, in which the settings are stored, are user-definable;
the file extension is predefined (*.uwb).
See also, chapter "File and Data Management" in the R&S WinIQSIM2 user manual.
Remote command:
[:SOURce<hw>]:BB:UWBMb:SETTing:CATalog? on page 44
[:SOURce<hw>]:BB:UWBMb:SETTing:LOAD on page 45
[:SOURce<hw>]:BB:UWBMb:SETTing:STORe on page 45
[:SOURce<hw>]:BB:UWBMb:SETTing:DELete on page 45
Generate Waveform File…
With enabled signal generation, triggers the instrument to store the current settings as
an ARB signal in a waveform file. Waveform files can be further processed by the ARB
and/or as a multi-carrier or a multi-segment signal.
The filename and the directory it is stored in are user-definable; the predefined file
extension for waveform files is *.wv.
Remote command:
[:SOURce<hw>]:BB:UWBMb:WAVeform:CREate on page 48
UWB MB-OFDM (ECMA-368) Version
Displays the current version of the UWB MB-OFDM standard.
The default settings and parameters relate to the specification of the displayed version.
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Remote command:
[:SOURce<hw>]:BB:UWBMb:VERSion? on page 47
Sequence Length
Sets the sequence length of the signal in number of frames.
Remote command:
[:SOURce<hw>]:BB:UWBMb:SLENgth on page 46
Frame Type
Selects the frame type of the generated signal. The selection defines parameters of the
MAC layer, e.g. the frame type and ACK policy bit fields of the MAC header.
"Data"
"Beacon"
"Control"
"Command"
"Aggregated"
Remote command:
[:SOURce<hw>]:BB:UWBMb:FTYPe on page 42
UWB MB-OFDM Configuration and Settings
General Settings
Frames contain useful data.
Generates beacon frames. Beacons are used for synchronization of a
shared channel.
Generates control frames.
Generates command frames.
Generates aggregated frames. The payload of these frames contains
an aggregation header and multiple MSDUs (MAC service data
units).
Band Group
Selects the band group for which a signal is generated.
The selection of band group defines the signal parameter time-frequency code ("TF
Code"). The combination for the parameters "Band Group" and "TF Code" defines the
band hopping within the selected band group (see also Chapter 2.1, "Physical Layer
MB-OFDM", on page 7).The currently selected hopping sequence is displayed in the
TFC graph.
Remote command:
[:SOURce<hw>]:BB:UWBMb:BGRoup on page 42
Band Group Graph
Displays the band groups. The currently selected band group is highlighted.
Remote command:
n.a.
TF Code
Selects the time-frequency code of the generated signal.
The value of the parameter "TF Code" depends on the selected "Band Group".
For band groups 1, 2, 3, 4 and 6, one of ten possible TF codes can be selected.
For band group 5 only three TF codes (TF code 5, 6 and 8) are enabled.
Depending on the standard TF code selected here, the parameter Cover Sequence
(Sync.) is set.
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The combination for the parameters "Band Group" and "TF Code" defines the band
hopping within the selected band group (see also Chapter 2.1, "Physical Layer MB-
OFDM", on page 7).
The currently selected hopping sequence is displayed in the TFC graph.
However, the user is enabled to reconfigure any standard TF code hopping sequence
by double click on a band in the TFC graph.
It automatically enables the parameter "Hopping Sequence User Defined", and the
configured user hopping sequence is saved as the last used user hopping sequence.
Disabling the parameter "Hopping Sequence User Defined" restores the last used
standard TF code pattern.
Any further enabling of the parameter "Hopping Sequence User Defined" restores the
last used user hopping sequence.
The configuration of used redefined hopping sequence does not affect the selection
made for the parameter "Cover Sequence".
Remote command:
[:SOURce<hw>]:BB:UWBMb:TFCode on page 47
UWB MB-OFDM Configuration and Settings
General Settings
Hopping Sequence User Defined
Indicates a user definable hopping sequence. This parameter triggers the TFC graph
to display the last user defined hopping sequence.
The reconfiguration of any standard TF code hopping sequence by double click on a
band in the TFC graph automatically enables parameter "Hopping Sequence User
Defined".
The configured user hopping sequence is saved as the last used user hopping
sequence.
Disabling the parameter "Hopping Sequence User Defined" restores the last used
standard TF code pattern.
Any further enabling of the parameter "Hopping Sequence User Defined" restores the
last used user hopping sequence.
Remote command:
[:SOURce<hw>]:BB:UWBMb:HSEQuence:USER[:STATe] on page 43
[:SOURce<hw>]:BB:UWBMb:HSEQuence on page 43
TFC Graph
Indicates the selected band hopping mechanism, according to the selection made for
the parameters "TF Code", "Band Group" and "Hopping Sequence User Defined".
You can reconfigure any standard TF code hopping sequence by double clicking a
band in the TFC graph.
Remote command:
[:SOURce<hw>]:BB:UWBMb:HSEQuence:USER[:STATe] on page 43
[:SOURce<hw>]:BB:UWBMb:HSEQuence on page 43
Transport Mode
Selects the transport mode of the signal.
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The selection defines the values enabled for the parameters "PLCP Preamble" and
"Data Length".
"Standard"
"Burst"
Remote command:
[:SOURce<hw>]:BB:UWBMb:TMODe on page 47
UWB MB-OFDM Configuration and Settings
General Settings
Transmits a single frame. The frames are separated by a short interframe separation interval (SIFS).
According to the standard, the duration of the SIFS is 32 symbols but
you can change it (see Inter Frame Spacing Value ).
A frame in a standard mode uses always the Standard Preamble .
Transmits a burst of frames that form the same source. The frames in
the burst are separated by a minimum inter-frame separation time
(MIFS).
According to the standard, the duration of the MIFS is 6 symbols but
you can change it.
For "Data Rates" ≤ 200Mbps, all the frames have a "Standard Preamble".
For "Data Rates" > 200Mbps, only the first frame uses the Standard
Preamble; the rest of the frame can use standard or burst preamble
(see Burst Preamble and Burst Preamble Used ).
For burst transport mode, the data length cannot be 0, i.e. the minimum Data Length is 1 byte.
Inter Frame Spacing Type
Selects the type of the inter frame spacing interval.
"SIFS"
"MIFS"
"User"
Remote command:
[:SOURce<hw>]:BB:UWBMb:IFS:TYPE on page 43
Inter Frame Spacing Value
Displays the duration in symbols of the inter frame spacing interval, depending on the
selection made for the parameter "Inter Frame Spacing Type".
For "Inter Frame Spacing Type" set to SIFS or MIFS, the value is read-only.
For "Inter Frame Spacing Type > User", the duration can be defined.
Remote command:
[:SOURce<hw>]:BB:UWBMb:IFS:VALue on page 44
Short inter frame spacing interval is the interval between two frames
in standard transmission mode.
According to the standard, SIFS has duration of 32 symbols.
Minimum inter frame spacing interval is the interval between two
frames in burst transmission mode.
According to the standard, MIFS has duration of 6 symbols.
The duration of the inter frame spacing interval can be defined, see "
Inter Frame Spacing Value " on page 21).
PPDU Configuration
Accesses "PPDU Configuration" dialog, see Chapter 3.2, "PPDU Configuration Set-
tings", on page 22. The current setting is displayed next to the button.
21Operating Manual 1171.5890.12 ─ 06
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