R&S®FSV3-K10
GSM Measurement
User Manual
(;Üì:2)
1178941002
Version 07
This manual applies to the following R&S®FSV3000 and R&S®FSVA3000 models with firmware version
1.70 and higher:
●
R&S®FSV3004 (1330.5000K04) / R&S®FSVA3004 (1330.5000K05)
●
R&S®FSV3007 (1330.5000K07) / R&S®FSVA3007 (1330.5000K08)
●
R&S®FSV3013 (1330.5000K13) / R&S®FSVA3013 (1330.5000K14)
●
R&S®FSV3030 (1330.5000K30) / R&S®FSVA3030 (1330.5000K31)
●
R&S®FSV3044 (1330.5000K43) / R&S®FSVA3044 (1330.5000K44)
The following firmware options are described:
●
R&S FSV/A-K10 (1330.5039.xx)
© 2022 Rohde & Schwarz GmbH & Co. KG
Muehldorfstr. 15, 81671 Muenchen, Germany
Phone: +49 89 41 29 - 0
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.
1178.9410.02 | Version 07 | R&S®FSV3-K10
The following abbreviations are used throughout this manual: R&S®FSV3 is abbreviated as R&S FSV3.
R&S®FSV3-K10
1 Documentation overview.....................................................................11
1.1 Getting started manual............................................................................................... 11
1.2 User manuals and help............................................................................................... 11
1.3 Service manual............................................................................................................ 11
1.4 Instrument security procedures................................................................................ 12
1.5 Printed safety instructions.........................................................................................12
1.6 Data sheets and brochures........................................................................................ 12
1.7 Release notes and open-source acknowledgment (OSA).......................................12
1.8 Application notes, application cards, white papers, etc......................................... 13
2 Welcome to the GSM application....................................................... 14
Contents
Contents
2.1 Starting the GSM application..................................................................................... 14
2.2 Understanding the display information.................................................................... 15
3 About the measurement......................................................................19
4 Measurements and result displays.................................................... 20
4.1 GSM I/Q measurement results................................................................................... 20
4.2 Multicarrier wideband noise measurements............................................................ 36
4.2.1 Multicarrier evaluation methods.................................................................................... 37
5 Basics on GSM measurements...........................................................47
5.1 Relevant digital standards......................................................................................... 47
5.2 Short introduction to GSM (GMSK, EDGE and EDGE evolution)........................... 47
5.3 Short introduction to VAMOS.....................................................................................51
5.4 AQPSK modulation..................................................................................................... 52
5.5 I/Q data import and export......................................................................................... 53
5.6 Trigger settings........................................................................................................... 54
5.7 Defining the scope of the measurement...................................................................55
5.8 Overview of filters in the R&S FSV3 GSM application.............................................57
5.8.1 Power vs time filter........................................................................................................58
5.8.2 Multicarrier filter.............................................................................................................59
5.8.3 Measurement filter........................................................................................................ 60
5.9 Dependency of slot parameters.................................................................................61
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5.10 Definition of the symbol period................................................................................. 61
5.10.1 GMSK modulation (normal symbol rate)....................................................................... 61
5.10.2 8PSK, 16QAM, 32QAM, AQPSK modulation (normal symbol rate)..............................62
5.10.3 QPSK, 16QAM and 32QAM modulation (higher symbol rate)...................................... 64
5.11 Synchronization.......................................................................................................... 65
5.12 Timeslot alignment......................................................................................................67
5.13 Delta to sync values....................................................................................................69
5.14 Limit checks................................................................................................................ 70
5.14.1 Limit check for modulation spectrum.............................................................................70
5.14.2 Limit check for transient spectrum................................................................................ 71
5.14.3 Limit check for power vs time results............................................................................ 71
5.15 Impact of the "Statistic count"...................................................................................72
5.16 Multicarrier and wideband noise............................................................................... 73
Contents
5.16.1 MCWN measurement process...................................................................................... 73
5.16.2 Contiguous vs non-contiguous multicarrier allocation...................................................75
5.16.3 Manual reference power definition for MCWN measurements..................................... 76
5.16.4 Limit check for MCWN results.......................................................................................77
5.16.5 Intermodulation calculation........................................................................................... 79
5.16.6 Wideband noise measurement..................................................................................... 82
5.17 Automatic carrier detection....................................................................................... 83
6 Configuration........................................................................................85
6.1 Multiple measurement channels and sequencer function...................................... 85
6.2 Display configuration................................................................................................. 87
6.3 Modulation accuracy measurement configuration.................................................. 87
6.3.1 Configuration overview..................................................................................................88
6.3.2 Signal description..........................................................................................................90
6.3.2.1 Device under test settings.............................................................................................90
6.3.2.2 Frame............................................................................................................................92
6.3.2.3 Slot settings...................................................................................................................94
6.3.2.4 Carrier settings..............................................................................................................97
6.3.3 Input, output and frontend settings................................................................................99
6.3.3.1 Input source settings................................................................................................... 100
Radio frequency input................................................................................................. 100
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6.3.3.2 Frequency settings......................................................................................................103
6.3.3.3 Amplitude settings.......................................................................................................106
6.3.3.4 Output settings............................................................................................................ 109
6.3.4 Trigger settings............................................................................................................110
6.3.5 Data acquisition...........................................................................................................113
6.3.5.1 Data acquisition...........................................................................................................113
6.3.5.2 Sweep..........................................................................................................................115
6.3.6 Demodulation.............................................................................................................. 117
6.3.6.1 Slot scope....................................................................................................................117
6.3.6.2 Demodulation settings.................................................................................................119
6.3.7 Measurement settings.................................................................................................122
6.3.7.1 Power vs time..............................................................................................................122
Contents
Settings for input from I/Q data files............................................................................102
6.3.7.2 Spectrum.....................................................................................................................124
6.3.7.3 Trigger to sync.............................................................................................................127
6.3.8 Adjusting settings automatically.................................................................................. 127
6.4 Multicarrier wideband noise (MCWN) measurements........................................... 129
6.4.1 Default settings for GSM MCWN measurements........................................................129
6.4.2 Configuration overview................................................................................................130
6.4.3 Signal description........................................................................................................131
6.4.3.1 Device under test settings...........................................................................................132
6.4.3.2 Carrier settings............................................................................................................134
6.4.4 Input and frontend settings..........................................................................................135
6.4.4.1 Radio frequency input................................................................................................. 136
6.4.4.2 Frequency settings......................................................................................................137
6.4.4.3 Amplitude settings.......................................................................................................139
6.4.4.4 Output settings............................................................................................................ 143
6.4.5 Trigger settings............................................................................................................144
6.4.6 Sweep settings............................................................................................................150
6.4.7 Reference measurement settings............................................................................... 151
6.4.8 Noise measurement settings.......................................................................................154
6.4.9 Adjusting settings automatically.................................................................................. 155
7 Analysis.............................................................................................. 157
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7.1 Result configuration................................................................................................. 157
7.1.1 Traces......................................................................................................................... 157
7.1.2 Markers....................................................................................................................... 159
7.1.2.1 Individual marker settings........................................................................................... 159
7.1.2.2 General marker settings..............................................................................................161
7.1.2.3 Marker positioning functions....................................................................................... 162
7.1.3 Y-Axis scaling..............................................................................................................163
8 How to perform measurements in the GSM application................ 166
8.1 How to perform a basic measurement on GSM signals........................................ 166
8.2 How to determine modulation accuracy parameters for GSM signals................ 167
8.3 How to analyze the power in GSM signals............................................................. 169
8.4 How to analyze the spectrum of GSM signals........................................................170
Contents
8.5 How to measure wideband noise in multicarrier setups.......................................172
9 Optimizing and troubleshooting the measurement........................ 174
9.1 Improving performance............................................................................................ 174
9.2 Improving EVM accuracy......................................................................................... 174
9.3 Optimizing limit checks............................................................................................ 175
9.4 Error messages......................................................................................................... 176
10 Remote commands to perform GSM measurements..................... 177
10.1 Introduction............................................................................................................... 177
10.1.1 Conventions used in descriptions............................................................................... 178
10.1.2 Long and short form.................................................................................................... 179
10.1.3 Numeric suffixes..........................................................................................................179
10.1.4 Optional keywords.......................................................................................................179
10.1.5 Alternative keywords................................................................................................... 180
10.1.6 SCPI parameters.........................................................................................................180
10.1.6.1 Numeric values........................................................................................................... 180
10.1.6.2 Boolean....................................................................................................................... 181
10.1.6.3 Character data............................................................................................................ 181
10.1.6.4 Character strings.........................................................................................................182
10.1.6.5 Block data................................................................................................................... 182
10.2 Common suffixes...................................................................................................... 182
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10.3 Activating GSM measurements............................................................................... 182
10.4 Selecting the measurement..................................................................................... 187
10.5 Configuring and performing GSM I/Q measurements........................................... 187
10.5.1 Signal description........................................................................................................188
10.5.1.1 Device under test settings...........................................................................................188
10.5.1.2 Frame..........................................................................................................................192
10.5.1.3 Slot.............................................................................................................................. 192
10.5.1.4 Carrier......................................................................................................................... 199
10.5.2 Input/output settings....................................................................................................201
10.5.2.1 RF input.......................................................................................................................202
10.5.2.2 Configuring file input................................................................................................... 204
10.5.2.3 Configuring the outputs............................................................................................... 206
10.5.3 Frontend configuration................................................................................................ 208
Contents
10.5.3.1 Frequency................................................................................................................... 208
10.5.3.2 Amplitude settings.......................................................................................................210
10.5.3.3 Configuring the attenuation......................................................................................... 214
10.5.4 Triggering measurements........................................................................................... 216
10.5.4.1 Configuring the triggering conditions...........................................................................216
10.5.4.2 Configuring the trigger output......................................................................................220
10.5.5 Data acquisition...........................................................................................................223
10.5.5.1 Data acquisition...........................................................................................................223
10.5.5.2 Configuring and performing sweeps........................................................................... 225
10.5.6 Demodulation.............................................................................................................. 230
10.5.6.1 Slot scope................................................................................................................... 230
10.5.6.2 Demodulation.............................................................................................................. 231
10.5.7 Measurement.............................................................................................................. 235
10.5.7.1 Power vs time..............................................................................................................235
10.5.7.2 Spectrum.....................................................................................................................236
10.5.7.3 Trigger to sync.............................................................................................................239
10.5.8 Adjusting settings automatically.................................................................................. 240
10.6 Configuring and performing MCWN measurements............................................. 242
10.6.1 Signal description........................................................................................................242
10.6.2 Input/output and frontend settings...............................................................................242
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10.6.2.1 Frequency settings......................................................................................................242
10.6.3 Triggering measurements........................................................................................... 244
10.6.4 Configuring the reference measurement.....................................................................244
10.6.5 Configuring the noise measurement........................................................................... 247
10.6.6 Adjusting settings automatically.................................................................................. 248
10.6.7 Performing sweeps..................................................................................................... 249
10.7 Analyzing GSM measurements................................................................................249
10.7.1 Configuring the result display......................................................................................249
10.7.1.1 General window commands........................................................................................249
10.7.1.2 Working with windows in the display...........................................................................250
10.7.2 Result config............................................................................................................... 257
10.7.2.1 Traces......................................................................................................................... 257
10.7.2.2 Marker......................................................................................................................... 260
Contents
Individual marker settings........................................................................................... 260
General marker settings..............................................................................................262
Marker positioning settings......................................................................................... 263
10.7.2.3 Scaling........................................................................................................................ 264
10.8 Retrieving results......................................................................................................267
10.8.1 Graphical results......................................................................................................... 267
10.8.2 Measurement results for TRACe<n>[:DATA]? TRACE<n>.........................................273
10.8.2.1 EVM, phase error, magnitude error trace results........................................................ 274
10.8.2.2 Pvt full burst trace results............................................................................................275
10.8.2.3 Modulation spectrum and transient spectrum graph results....................................... 275
10.8.2.4 Magnitude capture results...........................................................................................275
10.8.2.5 Trigger to sync results.................................................................................................276
10.8.2.6 MCWN spectrum graph...............................................................................................276
10.8.3 Magnitude capture results...........................................................................................276
10.8.4 Modulation accuracy results........................................................................................277
10.8.5 Modulation spectrum results....................................................................................... 289
10.8.6 Power vs slot results................................................................................................... 291
10.8.7 Transient spectrum results..........................................................................................299
10.8.8 Trigger to sync results.................................................................................................301
10.8.9 Limit check results.......................................................................................................302
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10.8.10 MCWN results............................................................................................................. 306
10.8.11 Retrieving marker results............................................................................................ 315
10.9 Importing and exporting I/Q data and results........................................................ 318
10.10 Status reporting system........................................................................................... 319
10.10.1 STATus:QUEStionable:SYNC register........................................................................320
10.10.2 STATus:QUEStionable:LIMit register.......................................................................... 320
10.10.3 Querying the status registers...................................................................................... 321
10.10.3.1 General status register commands............................................................................. 321
10.10.3.2 Reading out the EVENt part........................................................................................322
10.10.3.3 Reading out the CONDition part................................................................................. 322
10.10.3.4 Controlling the ENABle part........................................................................................ 323
10.10.3.5 Controlling the negative transition part........................................................................323
10.10.3.6 Controlling the positive transition part......................................................................... 324
Contents
10.11 Troubleshooting........................................................................................................324
10.12 Deprecated commands.............................................................................................325
10.13 Programming examples........................................................................................... 334
10.13.1 Programming example: determining the EVM............................................................ 334
10.13.2 Programming example: measuring an AQPSK signal................................................ 338
10.13.3 Programming example: measuring the power for access bursts................................ 341
10.13.4 Programming example: measuring statistics.............................................................. 343
10.13.5 Programming example: measuring the wideband noise for multiple carriers..............343
Annex.................................................................................................. 347
A List of abbreviations..........................................................................347
List of Commands (GSM).................................................................. 349
Index....................................................................................................358
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Contents
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R&S®FSV3-K10
1 Documentation overview
1.1 Getting started manual
Documentation overview
Service manual
This section provides an overview of the R&S FSV/A user documentation. Unless
specified otherwise, you find the documents on the R&S FSV/A product page at:
www.rohde-schwarz.com/product/FSVA3000.html/
www.rohde-schwarz.com/product/FSV3000.html
Introduces the R&S FSV/A and describes how to set up and start working with the
product. Includes basic operations, typical measurement examples, and general information, e.g. safety instructions, etc.
A printed version is delivered with the instrument. A PDF version is available for download on the Internet.
1.2 User manuals and help
Separate user manuals are provided for the base unit and the firmware applications:
●
Base unit manual
Contains the description of all instrument 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, instrument
interfaces and error messages. Includes the contents of the getting started manual.
●
Firmware application manual
Contains the description of the specific functions of a firmware application, including remote control commands. Basic information on operating the R&S FSV/A is
not included.
The contents of the user manuals are available as help in the R&S FSV/A. The help
offers quick, context-sensitive access to the complete information for the base unit and
the firmware applications.
All user manuals are also available for download or for immediate display on the Internet.
1.3 Service manual
Describes the performance test for checking the rated specifications, module replacement and repair, firmware update, troubleshooting and fault elimination, and contains
mechanical drawings and spare part lists.
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1.4 Instrument security procedures
1.5 Printed safety instructions
Documentation overview
Release notes and open-source acknowledgment (OSA)
The service manual is available for registered users on the global Rohde & Schwarz
information system (GLORIS):
R&S®FSVA3000/FSV3000 Service manual
Deals with security issues when working with the R&S FSV/A in secure areas. It is
available for download on the Internet.
Provides safety information in many languages. The printed document is delivered with
the product.
1.6 Data sheets and brochures
The data sheet contains the technical specifications of the R&S FSV/A. It also lists the
firmware applications and their order numbers, and optional accessories.
The brochure provides an overview of the instrument and deals with the specific characteristics.
See www.rohde-schwarz.com/brochure-datasheet/FSV3000 /
www.rohde-schwarz.com/brochure-datasheet/FSVA3000
1.7 Release notes and open-source acknowledgment (OSA)
The release notes list new features, improvements and known issues of the current
firmware version, and describe the firmware installation.
The open-source acknowledgment document provides verbatim license texts of the
used open source software.
See www.rohde-schwarz.com/firmware/FSV3000 /
www.rohde-schwarz.com/firmware/FSVA3000
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1.8 Application notes, application cards, white papers,
Documentation overview
Application notes, application cards, white papers, etc.
etc.
These documents deal with special applications or background information on particular topics.
See www.rohde-schwarz.com/application/FSV3000 /
www.rohde-schwarz.com/application/FSVA3000
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2 Welcome to the GSM application
Welcome to the GSM application
Starting the GSM application
The R&S FSV/A-K10 is a firmware application that adds functionality to perform GSM
measurements to the R&S FSV/A.
The R&S FSV/A-K10 features:
●
Measurements on downlink or uplink signals according to the Third Generation
Partnership Project (3GPP) standards for GSM/EDGE, EDGE Evolution (EGPRS2)
and Voice services over Adaptive Multi-user Channels on One Slot (VAMOS)
●
Measurement in time, frequency or I/Q domains
●
Measurements of mobile devices (MS), single carrier and multicarrier base transceiver stations (BTS)
●
Measurement of signals ith GMSK, AQPSK, QPSK, 8PSK, 16QAM and 32QAM
modulation, normal or higher symbol rate
●
Measurement of signals using different Tx filters (e.g. narrow and wide pulse)
●
Measurements for Power vs Time, "Modulation Accuracy" and Modulation and
Transient Spectrum as required in the standard
●
Measurements of wideband noise and intermodulation products in multicarrier
operation (as defined in 3GPP TS 51.021, chapter 6.12)
●
Measurements of wideband noise, narrowband noise, and intermodulation products in multicarrier operation (as defined in 3GPP TS 51.021, chapter 6.12)
This user manual contains a description of the functionality that the application provides, including remote control operation.
General R&S FSV/A functions
The application-independent functions for general tasks on the R&S FSV/A are also
available for GSM measurements and are described in the R&S FSV/A user manual. In
particular, this comprises the following functionality:
●
Data management
●
General software preferences and information
The latest version is available for download at the product homepage
http://www.rohde-schwarz.com/product/FSV3000.html.
Installation
You can find detailed installation instructions in the R&S FSV/A Getting Started manual
or in the Release Notes.
2.1 Starting the GSM application
GSM measurements are performed in a separate application on the R&S FSV/A.
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Welcome to the GSM application
Understanding the display information
To activate the GSM application
1. Select the [MODE] key.
A dialog box opens that contains all operating modes and applications currently
available on your R&S FSV/A.
2. Select the "GSM" item.
The R&S FSV/A opens a new measurement channel for the GSM application.
The measurement is started immediately with the default settings. It can be configured
in the GSM "Overview" dialog box, which is displayed when you select the "Overview"
softkey from any menu (see Chapter 6.3.1, "Configuration overview", on page 88).
Remote command:
INSTrument[:SELect] on page 186
Multiple Measurement Channels and Sequencer Function
When you activate an application, a new measurement channel is created which determines the measurement settings for that application. The same application can be activated with different measurement settings by creating several channels for the same
application.
The number of channels that can be configured at the same time depends on the available memory on the instrument.
Only one measurement channel can be active at any time. However, in order to perform the configured measurements consecutively, a Sequencer function is provided.
When the Sequencer is activated, the measurements configured in the currently active
channels are performed one after the other in the order of the tabs. The currently
active measurement is indicated by a
the individual channels are updated in the tabs as the measurements are performed.
Sequential operation itself is independent of the currently displayed tab.
symbol in the tab label. The result displays of
2.2 Understanding the display information
The following figure shows a measurement diagram during analyzer operation. All different information areas are labeled. They are explained in more detail in the following
sections.
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Welcome to the GSM application
Understanding the display information
1
6
5
1 = Channel bar for firmware and measurement settings
2+6 = Window title bar with diagram-specific (trace) information
3 = Diagram area
4 = Diagram footer with diagram-specific information, depending on measurement
5 = Instrument status bar with error messages, progress bar and date/time display
Channel bar information
In the GSM application, the R&S FSV/A shows the following settings for the default I/Q
measurement:
2
3
4
Table 2-1: Information displayed in the channel bar in the GSM application for the default I/Q mea-
surement
Ref Level Reference level
(m.+el.) Att Mechanical and electronic RF attenuation
Offset Reference level offset (if available)
Freq / ARFCN Center frequency for the GSM signal / Absolute Radio Frequency Channel
Number (if available)
Device / Band Device type and frequency band used by the DUT as defined in the Signal
description settings
Slot Scope Minimized visualization of the frame configuration and slots to be mea-
sured (see Chapter 5.7, "Defining the scope of the measurement",
on page 55)
SGL The sweep is set to single sweep mode.
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Welcome to the GSM application
Understanding the display information
Count Number of frames already evaluated / Total number of frames required for
statistical evaluation (Statistic Count)
(For Statistic Count > 1)
TRG Trigger source (if not "Free Run") and used trigger bandwidth (for IF, RF,
IP power triggers) or trigger offset (for external triggers)
MCWN measurement
For the MCWN measurement, the R&S FSV/A shows the following settings:
Table 2-2: Information displayed in the channel bar in the GSM application for the MCWN measure-
Ref Level Reference level
(m.+el.) Att Mechanical and electronic RF attenuation
Offset Reference level offset (if available)
Carriers Number of active carriers
Device / Band Device type and frequency band used by the DUT as defined in the Signal
Ref Meas Carrier used for reference measurement (if enabled)
SGL The sweep is set to single sweep mode
Count Value of the current average count / Total average count for noise mea-
TRG Trigger source (if not "Free Run") and used trigger bandwidth (for IF, RF,
ment
description settings
surement
(Noise Average Count)
IP power triggers) or trigger offset (for external triggers)
In addition, the channel bar also displays information on instrument settings that affect
the measurement results even though this is not immediately apparent from the display
of the measured values (e.g. transducer settings). This information is displayed only
when applicable for the current application. For details see the R&S FSV/A Getting
Started manual.
Window title bar information
For each diagram, the header provides the following information:
1
Figure 2-1: Window title bar information in the Pulse application
2
4
3
5
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Welcome to the GSM application
Understanding the display information
1 = Window number
2 = Window type
3 = Trace color
4 = Trace number
6 = Trace mode
Diagram footer information
The diagram footer (beneath the diagram) contains the start and stop values for the
displayed time, frequency or symbol range.
Status bar information
Global instrument settings, the instrument status and any irregularities are indicated in
the status bar beneath the diagram. Furthermore, the progress of the current operation
is displayed in the status bar.
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3 About the measurement
About the measurement
A basic GSM measurement in the R&S FSV/A GSM application includes a power vs
time and a spectrum measurement, as well as modulation accuracy (e.g. EVM, phase
error) for a GSM signal as defined by the relevant 3GPP standards. The I/Q data from
the GSM signal applied to the RF input of the R&S FSV/A is captured for a specified
measurement time. This data is demodulated and synchronized with a reference signal
to identify the individual frames and slots. The slots of interest are then analyzed in
order to display the spectral and power results either graphically or numerically, and to
calculate the modulation parameters.
The standard distinguishes between single-slot and multi-slot measurements. Singleslot measurements analyze one slot - referred to as the "Slot to measure" - within the
GSM frame (which consists of 8 slots in total). Modulation-specific parameters such as
the phase error, EVM, or spectrum due to modulation are determined on a per-slot
basis. Multi-slot measurements, on the other hand, analyze a slot scope of up to 8 consecutive slots, each of which has different burst modulation characteristics. Power vs
time limit checks and the transient spectrum measurements, for example, are determined for multiple slots.
Statistical evaluation of several measurements is also possible. Finally, the GSM measurement results can be exported to other applications.
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4 Measurements and result displays
Measurements and result displays
GSM I/Q measurement results
The R&S FSV/A GSM application provides two different measurements in order to
determine the parameters described by the GSM specifications.
The default GSM I/Q measurement captures the I/Q data from the GSM signal. The
I/Q data includes magnitude and phase information, which allows the R&S FSV/A GSM
application to demodulate signals and determine various characteristic signal parameters such as the modulation accuracy, power vs time, modulation and transient spectrum in just one measurement.
For multicarrier measurements, some parameters required by the GSM standard
require a frequency sweep with varying resolution bandwidths. Thus, a new separate
measurement is provided by the R&S FSV3 GSM application to determine the wideband noise in multicarrier measurement setups.
For details on selecting measurements see "Selecting the measurement type"
on page 85.
● GSM I/Q measurement results................................................................................20
● Multicarrier wideband noise measurements............................................................36
4.1 GSM I/Q measurement results
The I/Q data that was captured by the default GSM ("Modulation Accuracy", etc.) measurement can be evaluated using different methods. All evaluation methods available
for the GSM measurements are displayed in the selection bar in SmartGrid mode.
To activate SmartGrid mode, do one of the following:
●
Select the "SmartGrid" icon from the toolbar.
●
Select the "Display" button in the configuration "Overview".
●
Select the "Display Config" softkey from the [MEAS CONFIG] menu.
●
Press the [MEAS] key.
For details on working with the SmartGrid see the R&S FSV/A Getting Started manual.
By default, the GSM measurement results for I/Q measurements are displayed in the
following windows:
●
Magnitude Capture
●
PvT Full Burst
●
Modulation Accuracy
●
Power vs Slot
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Measurements and result displays
GSM I/Q measurement results
The following evaluation methods are available for GSM I/Q measurements:
Constellation................................................................................................................. 21
EVM.............................................................................................................................. 21
Magnitude Capture........................................................................................................22
Magnitude Error............................................................................................................ 23
Marker Table................................................................................................................. 23
Modulation Accuracy.....................................................................................................23
Modulation Spectrum Graph......................................................................................... 25
Modulation Spectrum Table...........................................................................................27
Phase Error...................................................................................................................29
Power vs Slot................................................................................................................ 29
PvT Full Burst................................................................................................................30
Transient Spectrum Graph............................................................................................32
Transient Spectrum Table............................................................................................. 33
Trigger to Sync Graph...................................................................................................34
Trigger to Sync Table.................................................................................................... 36
Constellation
The complex source signal is displayed as an X/Y diagram. The application analyzes
the specified slot over the specified number of bursts.
Remote command:
LAY:ADD? '1',RIGH,CONS, see LAYout:ADD[:WINDow]? on page 250
EVM
Displays the error vector magnitude over time for the Slot to Measure.
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Measurements and result displays
GSM I/Q measurement results
Remote command:
LAY:ADD:WIND '2',RIGH,ETIMe see LAYout:ADD[:WINDow]? on page 250
Results:
TRACe<n>[:DATA]? on page 269
Magnitude Capture
Displays the power vs. time trace of the captured I/Q data.
Pre-trigger samples are not displayed.
The analyzed slot scopes (1 to 8 slots of a single GSM frame) are indicated by a green
bar, the Slot to Measure in each frame by a blue bar at the bottom of the diagram.
For details see Chapter 5.7, "Defining the scope of the measurement", on page 55.
For negative trigger offsets, the trigger is displayed as a vertical red line labeled "TRG".
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Measurements and result displays
GSM I/Q measurement results
Remote command:
LAY:ADD:WIND '2',RIGH,MCAP see LAYout:ADD[:WINDow]? on page 250
Results:
FETCh:MCAPture:SLOTs:SCOPe? on page 277
FETCh:MCAPture:SLOTs:MEASure? on page 276
TRACe<n>[:DATA]? on page 269
Magnitude Error
Displays the magnitude error over time for the Slot to Measure.
Remote command:
LAY:ADD:WIND '2',RIGH,MERR see LAYout:ADD[:WINDow]? on page 250
Results:
TRACe<n>[:DATA]? on page 269
Marker Table
Displays a table with the current marker values for the active markers.
This table is displayed automatically if configured accordingly.
Tip: To navigate within long marker tables, simply scroll through the entries with your
finger on the touchscreen.
Remote command:
LAY:ADD? '1',RIGH, MTAB, see LAYout:ADD[:WINDow]? on page 250
Results:
CALCulate<n>:MARKer<m>:X on page 317
CALCulate<n>:MARKer<m>:Y? on page 317
Modulation Accuracy
Displays the numeric values of the fundamental modulation characteristics of the signal
to be analyzed in the vector (I/Q) domain: error vector magnitude ("EVM"), magnitude
and phase error, IQ imbalance, etc.
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The following modulation parameters are determined:
Table 4-1: Modulation accuracy parameters
Measurements and result displays
GSM I/Q measurement results
Parameter
"EVM" Error vector magnitude for the Slot to Measure
Mag Error Magnitude error for the Slot to Measure
"Phase
Error"
Origin Offset Suppression
[dB]
I/Q Offset
[%]
Description SCPI query for result value
RMS and peak error values for the current frame, in percent
95%ile: error value (in percent) below which 95% of all
"EVM" results for all frames in entire measurement fall
RMS and peak error values for the current frame, in percent
95%ile: error value (in percent) below which 95% of all
"Magnitude Error" results for all frames in entire measurement fall
Phase error for the Slot to Measure
RMS and peak error values for the current frame, in percent
95%ile: error value (in percent) below which 95% of all
"Phase Error" results for all frames in entire measurement
fall
Origin offset suppression for the demodulated signal in the
Slot to Measure; Indicates the suppression of the DC carrier;
the higher the suppression, the better the DUT
I/Q offset for the demodulated signal in the Slot to Measure
READ:BURSt[:MACCuracy][:EVM]:PEAK:
<Resulttype>?
READ:BURSt[:MACCuracy][:EVM]:RMS:
<Resulttype>?
READ:BURSt[:MACCuracy]PERCentile:EVM?
READ:BURSt[:MACCuracy]:MERRor:PEAK:
<Resulttype>?
READ:BURSt[:MACCuracy]:MERRor:RMS:
<Resulttype>?
READ:BURSt[:MACCuracy]PERCentile:MERRor?
READ:BURSt[:MACCuracy]:PERRor:PEAK:
<Resulttype>?
READ:BURSt[:MACCuracy]:PERRor:RMS:
<Resulttype>?
READ:BURSt[:MACCuracy]PERCentile:PERRor?
READ:BURSt[:MACCuracy]:OSUPpress:
<Resulttype>?
READ:BURSt[:MACCuracy]:IQOFfset:
<Resulttype>?
I/Q Imbalance
[%]
A measure for gain imbalances and quadrature errors
between the inphase and quadrature components of the signal.
READ:BURSt[:MACCuracy]:IQIMbalance:
<Resulttype>?
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Measurements and result displays
GSM I/Q measurement results
Parameter
Frequency
Error
[Hz]
Burst
Power
[dBm]
Amplitude
Droop
[dB]
Description SCPI query for result value
Frequency error of the center frequency currently measured
in the Slot to Measure
Average power measured in the slot
Indicates how much the amplitude decreases over a measured slot
The R&S FSV/A GSM application also performs statistical evaluation over a specified
number of results (see "Statistic Count" on page 116). To do so, the same slot is evaluated in multiple frames, namely in the number specified by the "Statistic Count". The
default value is 200 in accordance with the GSM standard.
For each parameter, the following results are displayed:
Table 4-2: Calculated summary results
Result
type
Current Value for currently measured frame only
Description SCPI query for result value
READ:BURSt[:MACCuracy]:FERRor:
<Resulttype>?
READ:BURSt[:MACCuracy]:BPOWer:
<Resulttype>?
READ:BURSt[:MACCuracy]:ADRoop:
<Resulttype>?
READ:BURSt[:MACCuracy]:<Parameter>:
CURRent?
Average Linear average value of "Current" results from the specified
number of frames
Exception: The average of the "Origin Offset Suppression"
is the linear average of the power ratio, converted to dBm
subsequently
Peak Maximum value of "Current" results from specified number of
frames
Exception: The peak of the "Origin Offset Suppression" is
the minimum value, as this represents the worst case, which
needs to be detected
Std Dev Standard deviation of "Current" results for specified number
of frames
Remote command:
LAY:ADD:WIND '2',RIGH,MACC see LAYout:ADD[:WINDow]? on page 250
Results:
READ:BURSt[:MACCuracy]:ALL? on page 280
Chapter 10.8.4, "Modulation accuracy results", on page 277
Modulation Spectrum Graph
The modulation spectrum evaluates the power vs frequency trace of a certain part of
the burst (50 to 90 % of the useful part, excluding the training sequence TSC) by measuring the average power in this part over several frames at certain fixed frequency offsets.
READ:BURSt[:MACCuracy]:<Parameter>:
AVERage?
READ:BURSt[:MACCuracy]:<Parameter>:
MAXimum?
READ:BURSt[:MACCuracy]:<Parameter>:
SDEViation?
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Measurements and result displays
GSM I/Q measurement results
The "Modulation Spectrum Graph" displays the measured power levels as a trace
against the frequencies.
The measured values can be checked against defined limits; the limit lines are indicated as red lines in the diagram. The result of the limit check ("PASS"/"FAIL") are shown
at the top of the diagram.
Note: The GSM standards define both absolute and relative limits for the spectrum.
The limit check is considered to fail if both limits are exceeded.
Note: The graphical results only provide an overview of the spectrum. For a detailed
conformance check of the DUT to the GSM standard, use the "Modulation Spectrum
Table" evaluation, which uses the 5-pole filter required by the 3GPP standard.
The numeric results of the modulation spectrum evaluation are displayed in the "Modu-
lation Spectrum Table" on page 27.
The following default settings are used for a "Modulation Spectrum" evaluation.
Table 4-3: Default settings for a "Modulation Spectrum" evaluation
Setting Default
Measurement Scope The slot selected as Slot to Measure
Averaging Configuration Number of bursts as selected in Statistic Count
Limit Check According to standard: Limit check of average (Avg) trace
See Chapter 5.14.1, "Limit check for modulation spectrum", on page 70
Note: Modulation RBW at 1800 kHz.
For the "Modulation Spectrum Graph" both the RBW and VBW are set to 30 kHz.
Remote command:
LAY:ADD:WIND '2',RIGH,MSFD see LAYout:ADD[:WINDow]? on page 250
Results:
TRACe<n>[:DATA]? on page 269
CALCulate<n>:LIMit<k>:FAIL? on page 303
CALCulate<n>:LIMit<li>:UPPer:DATA? on page 305
CALCulate<n>:LIMit<li>:CONTrol:DATA? on page 303
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Measurements and result displays
GSM I/Q measurement results
Modulation Spectrum Table
The modulation spectrum evaluates the power vs frequency trace of a certain part of
the burst (50 to 90 % of the useful part, excluding the training sequence TSC) by measuring the average power in this part over several frames.
The "Modulation Spectrum Table" displays the measured power levels and their offset
to the limits defined by the standard as numeric results.
Note: The GSM standards define both absolute and relative limits for the spectrum.
The limit check is considered to fail if both limits are exceeded.
Values that exceed both limits are indicated by red characters and an asterisk (*) next
to the value, and a negative "Δ to Limit" value.
Note: The graphical results of the modulation spectrum evaluation are displayed in the
"Modulation Spectrum Graph" on page 25.
The following values are displayed:
Table 4-4: Modulation spectrum results
Result Description
Offset [kHz] Fixed frequency offsets (from the center frequency) at which power is measured
Power Negative
Offsets
Power Positive
Offsets
Power at the frequency offset to the left of the center frequency
Levels are provided as:
[dB]: relative power level
[dBm]: absolute power level
Δ to Limit: power difference to limit defined in standard; negative values indicate the
power exceeds at least one of the limits
Power at the frequency offset to the right of the center frequency
Levels are provided as:
[dB]: relative power level
[dBm]: absolute power level
Δ to Limit: power difference to limit defined in standard; negative values indicate the
power exceeds at least one of the limits
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Measurements and result displays
GSM I/Q measurement results
Table 4-5: Frequencies and filter bandwidths in modulation spectrum measurements
Offset Frequency (kHz) RBW (kHz) VBW (kHz)
± 100 30 30
± 200 30 30
± 250 30 30
± 400 30 30
± 600 30 30
± 800 30 30
± 1000 30 30
± 1200 30 30
± 1400 30 30
± 1600 30 30
± 1800 30 (single-carrier BTS);
100 (multi-carrier BTS);
30 (single-carrier BTS);
100 (multi-carrier BTS);
Note: "Normal" vs "Wide" Modulation Spectrum measurements.
In previous Rohde & Schwarz signal and spectrum analyzers, both a "normal" and a
"wide" modulation spectrum were available for GSM measurements. In the R&S FSV/A
GSM application, only one evaluation is provided. The frequency range of the frequency list, however, can be configured to be "wider" or "narrower" (see "Modulation
Spectrum Table: Frequency List" on page 126). The RBW and VBW are then adapted
accordingly.
Note: RBW at 1800 kHz.
As opposed to previous Rohde & Schwarz signal and spectrum analyzers, in which the
RBW at 1800 kHz was configurable, the R&S FSV/A configures the RBW (and VBW)
automatically according to the selected frequency list (see "Modulation Spectrum
Table: Frequency List" on page 126). For the "Modulation Spectrum Graph" both the
RBW and VBW are set to 30 kHz. For the "Modulation Spectrum Table", they are set
according to Table 4-6, depending on the measured Device Type and the number of
active carriers as defined in the "Signal Description" settings.
Table 4-6: RBW settings for Modulation Spectrum Table measurements according to standard
Offset Single-carrier BTS Multicarrier BTS
(N=1)
< 1.8 MHz
1.8 MHz
> 1.8 MHz
30 kHz
30 kHz
100 kHz
1)
1)
3)
30 kHz
100 kHz
100 kHz
3)
3)
3)
Multicarrier BTS
(N>1)
2)
30 kHz
100 kHz
100 kHz
2)
2)
MS mode
4)
30 kHz
100 kHz
100 kHz
5)
5)
1) See 3GPP TS 51.021 § 6.5.1.2 c) d)
2) See 3GPP TS 51.021 § 6.12.2
3) See 3GPP TS 51.021 § 6.5.1.2 f)
4) See 3GPP TS 51.010-1 § 13.4.4.2 f) and 3GPP TS45.005 § 4.2.1.3, table a1-c4
5) See 3GPP TS 51.010-1 § 13.4.4.2 d) and 3GPP TS 45.005 § 4.2.1.3
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Measurements and result displays
GSM I/Q measurement results
Remote command:
LAY:ADD:WIND '2',RIGH,MST see LAYout:ADD[:WINDow]? on page 250
Results:
READ:SPECtrum:MODulation[:ALL]? on page 289
READ:SPECtrum:MODulation:REFerence[:IMMediate]? on page 290
Phase Error
Displays the phase error over time.
The following default settings are used for a "Phase Error vs Time" measurement.
Setting Default
Measurement Scope The slot selected as Slot to Measure
Averaging Configuration Number of frames as selected in Statistic Count
Limit Check None
Remote command:
LAY:ADD:WIND '2',RIGH,PERR see LAYout:ADD[:WINDow]? on page 250
Results:
TRACe<n>[:DATA]? on page 269
Power vs Slot
Displays the power per slot in the current frame and over all frames. The result of the
(Power vs Time) limit check is also indicated.
Note: The power is measured for inactive slots, but not for slots outside the slot scope
(see Chapter 5.7, "Defining the scope of the measurement", on page 55).
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Measurements and result displays
The following power values are determined:
Table 4-7: Measured power values for Power vs Slot results
Value Description SCPI query for result value
GSM I/Q measurement results
Slot Analyzed slot number in frame(s)
[0..7]
PvT Limit Power vs Time limit for the power vs time
trace of the slot, defined by the standard
Delta to
Sync
[NSP]
Power
Avg
[dBm]
Power
Peak
[dBm]
Crest
[dB]
The distance between the mid of the TSC
and the TSC of the Slot to Measure
NSP stands for Normal Symbol Period, i.e.
the duration of one symbol using a normal
symbol rate (approx. 3.69μs).
The measured "Delta to Sync" value has a
resolution of 0.02 NSP.
For details see Chapter 5.13, "Delta to sync
values", on page 69.
Average power in slot in current or all frames READ:BURSt:SPOWer:SLOT<Slot>:CURRent:AVERage?
Maximum power in slot in current or all
frames
Crest factor in slot in current or all frames, i.e.
Power Peak / Power Avg
READ:BURSt:SPOWer:SLOT<Slot>:LIMit:FAIL? on page 298
READ:BURSt:SPOWer:SLOT<Slot>:DELTatosync? on page 297
on page 294
READ:BURSt:SPOWer:SLOT<Slot>:ALL:AVERage? on page 292
READ:BURSt:SPOWer:SLOT<Slot>:CURRent:MAXimum?
on page 296
READ:BURSt:SPOWer:SLOT<Slot>:ALL:MAXimum? on page 293
READ:BURSt:SPOWer:SLOT<Slot>:CURRent:CRESt?
on page 295
READ:BURSt:SPOWer:SLOT<Slot>:ALL:CRESt? on page 292
Remote command:
LAY:ADD:WIND '2',RIGH,PST see LAYout:ADD[:WINDow]? on page 250
Results:
Chapter 10.8.6, "Power vs slot results", on page 291
PvT Full Burst
The Power vs Time evaluation determines the power of all slots (bursts) in the selected
slot scope and performs a limit check of the power vs time trace against the specified
PvT mask.
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