R&S®ETL-K470
CDR Signal Analysis Software
Manual
(=^çJ2)
1346892602
Manual
Version 01
This manual applies to the following instrument, version 3.51 and later:
●
R&S®ETL (2112.0004.13)
The following software options are described:
●
R&S®ETL-K470 CDR Signal Analysis Software (1346.8884.02)
The following hardware options are recommended:
●
R&S®ETL-B203 RF Preselector (2112.0327.03)
© 2019 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: +49 89 41 29 - 0
Fax: +49 89 41 29 12 164
Email: info@rohde-schwarz.com
Internet: www.rohde-schwarz.com
Subject to change – Data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
1346.8926.02 | Version 01 | R&S®ETL-K470
The following abbreviations are used throughout this manual: R&S®ETL-CDR Signal Analysis Software is abbreviated as R&S ETLCDR software. R&S®VSE is abbreviated as R&S VSE.
R&S®ETL-K470
1 Preface.................................................................................................... 5
1.1 About this Manual......................................................................................................... 5
1.2 Typographical Conventions......................................................................................... 6
2 Welcome to the R&S ETL CDR software..............................................7
2.1 Introduction to Vector Signal Analysis....................................................................... 7
2.2 Installing the R&S ETL CDR software......................................................................... 8
2.3 Starting the R&S ETL CDR software......................................................................... 10
2.4 Understanding the Display Information....................................................................12
3 CDR Measurement and Results..........................................................14
3.1 CDR Parameters..........................................................................................................14
Contents
Contents
3.2 Evaluation Methods for CDR Measurements........................................................... 15
4 Configuring CDR Measurements........................................................33
4.1 Configuration Overview..............................................................................................33
4.2 CDR Configuration......................................................................................................35
4.3 Input and Frontend Settings...................................................................................... 38
4.4 Trigger Settings...........................................................................................................45
4.5 Data Acquisition..........................................................................................................48
4.6 Result Ranges............................................................................................................. 52
4.7 Synchronization, Demodulation and Tracking.........................................................52
5 Analyzing CDR Vector Signals............................................................57
5.1 Result Configuration...................................................................................................57
5.2 Table Configuration.....................................................................................................59
5.3 Units............................................................................................................................. 59
5.4 Y-Scaling......................................................................................................................60
5.5 Markers........................................................................................................................ 62
5.6 Trace Settings..............................................................................................................68
5.7 Trace / Data Export Configuration.............................................................................70
6 How to Perform Measurements in the R&S ETL CDR software.......72
7 Remote Commands for CDR Measurements.....................................73
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7.1 Introduction................................................................................................................. 73
7.2 Common Suffixes........................................................................................................78
7.3 Activating CDR Measurements..................................................................................79
7.4 Configuring CDR Measurements...............................................................................79
7.5 Analysis..................................................................................................................... 106
7.6 Configuring the Result Display................................................................................128
7.7 Retrieving Results.....................................................................................................138
7.8 Status Reporting System......................................................................................... 160
7.9 Programming Examples: OFDM Vector Signal Analysis.......................................163
A Menu Reference................................................................................. 167
A.1 Common R&S ETL CDR software Menus............................................................... 167
Contents
Annex.................................................................................................. 166
A.2 CDR Signal Analysis Menus.................................................................................... 169
B Reference of Toolbar Functions....................................................... 172
C Formulae.............................................................................................176
C.1 I/Q Impairments......................................................................................................... 176
List of Remote Commands (ETL CDR).............................................177
Index....................................................................................................181
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1 Preface
1.1 About this Manual
Preface
About this Manual
This R&S ETL CDR software manual provides all the information specific to the
application. All general software functions and settings common to all applications are
described in the R&S VSE base software user manual.
The main focus in this manual is on the measurement results and the tasks required to
obtain them. The following topics are included:
●
Welcome to the R&S ETL CDR software
Introduction to and getting familiar with the application, installation information
●
Measurements and result displays
Details on supported measurements and their result types
●
Measurement basics
Background information on basic terms and principles in the context of the measurement
●
Configuration and analysis
A concise description of all functions and settings available to configure measurements and analyze results with their corresponding remote control command
●
How to perform measurements in the R&S ETL CDR software
The basic procedure to perform each measurement and step-by-step instructions
for more complex tasks or alternative methods
●
Measurement examples
Detailed measurement examples to guide you through typical measurement scenarios and allow you to try out the application immediately
●
Optimizing and troubleshooting the measurement
Hints and tips on how to handle errors and optimize the measurement configuration
●
Remote commands for CDR measurements
Remote commands required to configure and perform CDR measurements in a
remote environment, sorted by tasks
(Commands required to set up the environment or to perform common tasks in the
software are provided in the R&S VSE base software user manual.)
Programming examples demonstrate the use of many commands and can usually
be executed directly for test purposes
●
Annex
Reference material
●
List of remote commands
Alphabetical list of all remote commands described in the manual
●
Index
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1.2 Typographical Conventions
Preface
Typographical Conventions
The following text markers are used throughout this documentation:
Convention Description
"Graphical user interface elements"
[Keys] Key and knob names are enclosed by square brackets.
File names, commands,
program code
Input Input to be entered by the user is displayed in italics.
Links Links that you can click are displayed in blue font.
"References" References to other parts of the documentation are enclosed by quota-
All names of graphical user interface elements on the screen, such as
dialog boxes, menus, options, buttons, and softkeys are enclosed by
quotation marks.
File names, commands, coding samples and screen output are distinguished by their font.
tion marks.
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2 Welcome to the R&S ETL CDR software
Welcome to the R&S ETL CDR software
Introduction to Vector Signal Analysis
The R&S ETL CDR software performs vector and scalar measurements on convergent
digital radio (CDR) signals. To perform the measurements, it converts RF signals into
the complex baseband.
The R&S ETL CDR software features:
●
Analysis of convergent digital radio (CDR) signals as defined by People's Republic
of China, Radio, Film and Television Industry Standard GY/T 268.1-2013
●
I/Q-based measurement results such as MER, constellation diagrams, power spectrum
This user manual contains a description of the functionality that the application provides, including remote control operation.
The R&S ETL CDR software is based on the R&S VSE Vector Signal Explorer Base
Software. Functions that are not discussed in this manual are the same as in the I/Q
Analyzer application and are described in the R&S VSE base software user manual.
The latest version is available for download at the product homepage http://
www.rohde-schwarz.com/product/VSE.html.
Note, however, that the R&S ETL CDR software does not support the full functionality
of the R&S VSE software.
In particular, the following restrictions apply:
●
No instruments other than R&S ETL are supported.
●
Only a single R&S ETL can be connected.
●
Only a single instance of the R&S VSE can be connected to the same R&S ETL at
the same time.
●
Only the R&S ETL CDR software (OFDM VSA) and the I/Q Analyzer are supported
as measurement modes. (Regardless of any other option licenses that may be
available on an FS-PC dongle, for example.)
● Introduction to Vector Signal Analysis.......................................................................7
● Installing the R&S ETL CDR software.......................................................................8
● Starting the R&S ETL CDR software...................................................................... 10
● Understanding the Display Information...................................................................12
2.1 Introduction to Vector Signal Analysis
The goal of vector signal analysis is to determine the quality of the signal that is transmitted by the device under test (DUT) by comparing it against an ideal signal. The DUT
is usually connected with the analyzer via a cable. The key task of the analyzer is to
determine the ideal signal. Hence, the analyzer aims to reconstruct the ideal signal
from the measured signal that is transmitted by the DUT. This ideal signal is commonly
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Welcome to the R&S ETL CDR software
Installing the R&S ETL CDR software
referred to as the reference signal, while the signal from the DUT is called the mea-
surement signal.
After extracting the reference signal, the R&S ETL CDR software compares the measurement signal and the reference signal, and the results of this comparison are displayed.
Example:
The most common vector signal analysis measurement is the MER (Modulation Error
Ratio) measurement. Here, the complex baseband reference signal is subtracted from
the complex baseband measurement signal. The magnitude of this error vector represents the MER value. The MER has the advantage that it "summarizes" all potential
errors and distortions in one single value. If the MER value is high, the signal quality of
the DUT is high.
Figure 2-1: Simplified schema of vector signal analysis
2.2
Installing the R&S ETL CDR software
2.2.1 Installing Required Components
The following software components must be installed to run the R&S ETL CDR software successfully:
●
Microsoft .NET Framework 4.0
●
R&S License Server
●
VISA (Virtual Instrument Software Architecture)
The R&S License Server and Microsoft .NET Framework 4.0 are installed automatically during installation of the R&S ETL CDR software.
VISA can be installed directly during installation of the R&S ETL CDR software, or
manually, independently of the R&S ETL CDR software installation.
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Welcome to the R&S ETL CDR software
Installing the R&S ETL CDR software
Installing the Microsoft .NET Framework
When you install the R&S ETL CDR software via the provided installation file (see
Chapter 2.2.2, "Installing the R&S ETL CDR software", on page 9), the installer
automatically checks whether the required Microsoft .NET Framework version is available on the PC. If not, an internet connection to the Microsoft website is established to
download the Framework version 4.0 (due to the large file size). Thus, before attempting to install the R&S ETL CDR software, ensure that a strong internet connection is
available from the PC, as downloading can take some time. Alternatively, download the
Framework 4.0 version from the internet manually before you start the R&S ETL CDR
software installation.
Installing VISA
It is also necessary to install VISA (Virtual Instrument Software Architecture) on the PC
to access instruments connected via IEEE or LAN bus.
It is recommended that you use the R&S VISA driver. The R&S VISA driver is supplied
with the R&S ETL CDR software installation, and can be installed together with the
R&S ETL CDR software (see Chapter 2.2.2, "Installing the R&S ETL CDR software",
on page 9).
Once the R&S ETL CDR software is installed, a status icon in the status bar indicates
whether the VISA installation is available.
2.2.2 Installing the R&S ETL CDR software
The R&S ETL CDR software is based on the R&S VSE base software. To install the
R&S ETL CDR software, the R&S VSE software installation package is used. It consists of one file, whose name contains the main version number, e.g.
VSESetup_V1.60.exe. It is referred to as VSESetup.exe throughout this description. Download the file from the Rohde & Schwarz web page at http://www.rohde-
schwarz.com/software/VSE.
The R&S ETL CDR software can only be installed on PCs using the 64-bit version of
Windows 7 or Windows 10. Installation on an R&S ETL instrument is not supported. It
is recommended that you copy the R&S VSE installation file to the hard disk of the PC
before you execute it.
To install the R&S ETL CDR software
1. Execute the VSESetup_XXX.exe file on the PC.
2. Select the required options to install:
● Unless you have ensured the required R&S VISA is installed manually before
starting the R&S VSE installation on a PC, be sure to keep the "R&S VISA"
option selected.
● "R&S VSE Vector Signal Explorer software"
● "R&S VSE K96 OFDM signal analysis"
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Welcome to the R&S ETL CDR software
Starting the R&S ETL CDR software
● "Activate R&S ETL-CDR K470"
3. Select "Install".
The installer performs the following actions:
●
Checks for the required Microsoft .NET Framework versions on the PC, and if necessary, downloads the required version from the Internet, before installing both versions
●
If enabled, installs the R&S VISA software on the PC
●
Installs the R&S ETL CDR software including an uninstall tool
●
Creates a shortcut on the desktop
●
If necessary (the software specifically asks you), sets the required environment
variables
This step can require administrator rights on the PC.
When the installation is complete, the dialog box turns green and all selected options
are indicated as "OK".
2.2.3 Deinstalling the R&S ETL CDR software
Access: "Start" > "All Programs" > "Rohde-Schwarz" > "VSE" > [version_number] >
"Uninstall VSE"
or: (Windows 7) "Start" > "Control Panel" > "Add or Remove Software"
or: (Windows 10) "Start" > "Settings" > "System" > "Apps & features" > "R&S VSE Sig-
nal Analyzer" > "Uninstall".
You can uninstall the R&S VSE itself via the uninstall tool available in the R&S VSE
folder, or via the standard Windows "Add or Remove Software" function.
2.3 Starting the R&S ETL CDR software
The R&S ETL CDR software is an application in the R&S VSE software.
Prerequisites for starting the R&S ETL CDR software
Before you start the R&S ETL CDR software, the following prerequisites must be met:
●
An Ethernet connection from the PC to an R&S ETL must be established.
●
The R&S ETL must have a valid R&S ETL-K470 CDR license and a firmware version 3.51 or later.
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Welcome to the R&S ETL CDR software
Starting the R&S ETL CDR software
The R&S ETL-K470 CDR license is a single license. That means only a single instance
of the R&S VSE can be connected to the same R&S ETL at the same time. If a second
R&S VSE instance (running on a different PC) attempts to connect to the same
R&S ETL, the second R&S VSE instance displays the following message: "ETL connection broken or removed. Shutting down application." The second instance then
shuts down automatically after 30 seconds.
To start the R&S ETL CDR software
1. Start the R&S VSE via the Windows "Start Menu" entry or the shortcut on the desktop.
2. Enter the IP address of the connected R&S ETL. If no valid R&S ETL-K470 CDR
license is found, the software does not start.
The R&S VSE software runs in an exclusive CDR mode. CDR mode is designed to
analyze CDR signals within the R&S VSE software. The correct channel "OFDM
VSA" is started automatically when the software is launched. Additionally, you can
start it by creating a measurement channel in CDR mode.
To activate the R&S ETL CDR software
1.
Select the "Add Channel" function in the Sequence tool window.
A dialog box opens that contains all operating modes and applications currently
available in your R&S VSE.
2. Select the "OFDM VSA" item.
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2.4 Understanding the Display Information
Welcome to the R&S ETL CDR software
Understanding the Display Information
The R&S VSE opens a new measurement channel for the R&S ETL CDR software.
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.
1
= Color coding for windows of same channel
2 = Channel bar with measurement settings
3 = Window title bar with diagram-specific (trace) information
4 = Diagram area
5 = Diagram footer with diagram-specific information, depending on result display
Channel bar information
In the R&S ETL CDR software, the following settings are shown:
Table 2-1: Information displayed in the channel bar in the R&S ETL CDR software
Ref Level Reference level
Att Mechanical and electronic RF attenuation
Freq Center frequency for the RF signal
Offset Reference level offset
SRate Sample Rate (fixed to 816 kHz)
Config Currently loaded configuration file
Capture Time How long data was captured in current sweep
FFT FFT size
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Welcome to the R&S ETL CDR software
Understanding the Display Information
CP Length Cyclic prefix length of the beacon (CP1) and the data body (CP2)
Trigger to Frame Offset between the trigger event and the start of the CDR subframe
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 or trigger settings). This information is displayed only when applicable for the current measurement. For details, see the
R&S VSE base software user manual.
Window title bar information
For each diagram, the header provides the following information:
0
21 64 75
Figure 2-2: Window title bar information in R&S ETL CDR software
0 = Color coding for windows of same channel
1 = Edit result display function
2 = Channel name
3 = Window number
4 = Window type
5 = Trace color, trace number, trace mode
6 = Dock/undock window function
7 = Close window function
3
Diagram area
The diagram area displays the results according to the selected result displays (see
Chapter 3.2, "Evaluation Methods for CDR Measurements", on page 15).
Diagram footer information
The diagram footer (beneath the diagram) contains the start and stop symbols or time
of the evaluation range.
Status bar information
The software status, errors and warnings and any irregularities in the software are indicated in the status bar at the bottom of the R&S VSE window.
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3 CDR Measurement and Results
CDR Measurement and Results
CDR Parameters
For each measurement, a separate measurement channel is activated. Each measurement channel can provide multiple result displays, which are displayed in individual
windows. The measurement windows can be rearranged and configured in the
R&S ETL CDR software to meet your requirements. All windows that belong to the
same measurement (including the channel bar) are indicated by a colored line at the
top of the window title bar.
To add further result displays for the CDR channel
►
Select the
"Add Window" icon from the toolbar, or select the "Window > New
Window" menu item.
For details on working with channels and windows, see the "Operating Basics" chapter
in the R&S VSE base software user manual.
● CDR Parameters.....................................................................................................14
● Evaluation Methods for CDR Measurements..........................................................15
3.1 CDR Parameters
Several signal parameters are determined during vector signal analysis and displayed
in the Result Summary.
For details concerning the calculation of individual parameters, see Chapter C, "Formu-
lae", on page 176.
Table 3-1: CDR parameters
Parameter Description SCPI Parameter
MER [dB] Average Modulation Error Ratio (MER) for all data and all
pilot cells of the analyzed frames. The MER is the ratio of the
RMS power of the ideal reference signal to the RMS power
of the error vector.
MER[:ALL]
MER Data Symbols
[dB]
MER Pilot Symbols
[dB]
I/Q offset [dB] Transmitter center frequency leakage relative to the total Tx
Gain imbalance [dB] Amplification of the quadrature phase component of the sig-
Quadrature error [°] Phase angle between Q-channel and I-channel deviating
*) Required to retrieve the parameter result,
See FETCh:SUMM:<parameter>[:AVERage] on page 141
Average Modulation Error Ratio of the payload symbols over
all data carriers
Average Modulation Error Ratio of the payload symbols over
all pilot carriers
channel power
nal relative to the amplification of the in-phase component
from the ideal 90 degrees; measure for crosstalk from the Qbranch into the I-branch
MER:DATA
MER:PILot
IQOFset
GIMBalance
QUADerror
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Evaluation Methods for CDR Measurements
Parameter Description SCPI Parameter
Frequency Error [Hz] Frequency error between the signal and the currently defined
center frequency
The R&S ETL CDR software is designed to compensate car-
rier offsets of up to ±2 kHz. For higher frequency offsets, you
must configure the Maximum Carrier Offset and the filters
accordingly (see Chapter 4.7, "Synchronization, Demodula-
tion and Tracking", on page 52 and "Filter Settings"
on page 50).
The absolute frequency error includes the frequency error of
the connected R&S ETL and that of the DUT. If possible, the
transmitter connected R&S ETL and the DUT should be
synchronized (using an external reference).
See R&S VSE base software user manual > "Configuring
Instruments"
Sample Clock Error Clock error between the signal and the sample clock of the
R&S ETL CDR software in parts per million (ppm), i.e. the
symbol timing error
If possible, the transmitter connected R&S ETL and the DUT
should be synchronized (using an external reference).
See R&S VSE base software user manual > "Configuring
Instruments"
Frame Power Average time domain power of the analyzed subframe
Crest factor [dB] The ratio of the peak power to the mean power of the ana-
lyzed subframe
FERRor
SERRor
POWer
CRESt
Trigger to Frame [s] (Displayed in channel bar only, not included in Result Sum-
mary.)
The time offset between the trigger event and the start of the
first CDR subframe
*) Required to retrieve the parameter result,
See FETCh:SUMM:<parameter>[:AVERage] on page 141
3.2 Evaluation Methods for CDR Measurements
The data that was measured by the R&S ETL CDR software can be evaluated using
various different methods without having to start a new measurement. Which results
are displayed depends on the selected evaluation.
The CDR measurement provides the following evaluation methods:
Allocation Matrix............................................................................................................16
CCDF............................................................................................................................ 17
Channel Flatness.......................................................................................................... 17
Constellation Diagram...................................................................................................18
Constellation vs Carrier.................................................................................................20
Constellation vs Symbol................................................................................................21
MER vs Carrier..............................................................................................................22
MER vs Symbol.............................................................................................................23
MER vs Symbol vs Carrier............................................................................................24
FETCh:TTFRame?
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Evaluation Methods for CDR Measurements
Group Delay..................................................................................................................25
Impulse Response........................................................................................................ 25
Magnitude Capture........................................................................................................26
Marker Table ................................................................................................................ 27
Power vs Carrier........................................................................................................... 27
Power vs Symbol.......................................................................................................... 28
Power vs Symbol vs Carrier..........................................................................................29
Power Spectrum............................................................................................................30
Result Summary............................................................................................................30
Signal Flow....................................................................................................................31
Allocation Matrix
The Allocation Matrix display is a graphical representation of the OFDM cell structure
defined by the current CDR configuration.
Use markers to get more detailed information on the individual cells.
Figure 3-1: Allocation Matrix
The legend for the color coding is displayed at the top of the matrix.
Markers in the Allocation Matrix
Using markers you can detect individual allocation points for a specific symbol or carrier. When you activate a marker in the Allocation Matrix, its position is defined by the
symbol and carrier number the point belongs to. The marker result indicates the I and
Q values of the point.
See also "Markers in the Constellation diagram and Allocation Matrix" on page 63.
Remote command:
LAY:ADD? '1',RIGH,AMATrix, see LAYout:ADD[:WINDow]? on page 132
TRACe<n>[:DATA]? on page 150, see Chapter 7.7.4.1, "Allocation Matrix",
on page 155
TRACe<n>[:DATA]:X? on page 151
TRACe<n>[:DATA]:Y? on page 151
Symbol unit: UNIT:SAXes on page 113
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Evaluation Methods for CDR Measurements
CCDF
The CCDF results display shows the probability of an amplitude exceeding the mean
power. The x-axis displays power relative to the measured mean power.
Figure 3-2: CCDF display
Remote command:
LAY:ADD? '1',RIGH,CCDF, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.2, "CCDF", on page 155
TRACe<n>[:DATA]:X? on page 151
Channel Flatness
The Channel Flatness display shows the amplitude of the channel transfer function vs.
carrier.
The channel flatness can only be calculated at valid carrier locations. This means that
a gap appears between the upper and lower half subband for spectrum mode index 9,
10, 22, and 23.
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Evaluation Methods for CDR Measurements
Figure 3-3: Channel Flatness Display
Remote command:
LAY:ADD? '1',RIGH,CHFL, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.3, "Channel Flatness", on page 155
TRACe<n>[:DATA]:X? on page 151
Carrier unit: UNIT:CAXes on page 111
Constellation Diagram
The Constellation Diagram shows the inphase and quadrature results for the analyzed
input data. The ideal points for the selected cell types are displayed for reference purposes.
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Evaluation Methods for CDR Measurements
Figure 3-4: Constellation diagram
The legend for the color coding is displayed at the top of the matrix. If you click on one
of the codes, only the selected constellation points are displayed. Click again, and all
constellation points are displayed again (according to the constellation filter, see Chap-
ter 5.1, "Result Configuration", on page 57).
Markers in the Constellation diagram
Using markers you can detect individual constellation points for a specific symbol or
carrier. When you activate a marker in the Constellation diagram, its position is defined
by the symbol and carrier number the point belongs to. The marker result indicates the
I and Q values of the point.
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Evaluation Methods for CDR Measurements
Figure 3-5: Marker in a Constellation diagram
See also "Markers in the Constellation diagram and Allocation Matrix" on page 63.
Remote command:
LAY:ADD? '1',RIGH,CONS, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.4, "Constellation Diagram", on page 155
Marker I/Q values:
CALCulate<n>:MARKer<m>:Z? on page 147
Constellation vs Carrier
The Constellation vs. Carrier display shows the inphase and quadrature magnitude
results of all analyzed symbols over the corresponding carriers. The inphase values
are displayed as yellow dots; the quadrature-values are displayed as blue dots.
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Evaluation Methods for CDR Measurements
Figure 3-6: Constellation vs. Carrier display
Note: This result display is only available if synchronization is successful.
Remote command:
LAY:ADD? '1',RIGH,CCAR, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4, "Using the TRACe[:DATA] Command",
on page 154
Carrier unit: UNIT:CAXes on page 111
Constellation vs Symbol
The Constellation vs. Symbol display shows the inphase and quadrature magnitude
results of all analyzed carriers over the corresponding symbols. The inphase values
are displayed as yellow dots; the quadrature-values are displayed as blue dots.
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Evaluation Methods for CDR Measurements
Figure 3-7: Constellation vs. Symbol display
Note: This result display is only available if synchronization is successful.
Remote command:
LAY:ADD? '1',RIGH,CSYM, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4, "Using the TRACe[:DATA] Command",
on page 154
Symbol unit: UNIT:SAXes on page 113
MER vs Carrier
The MER vs Carrier display shows the MER of each carrier of the analyzed subframe
in the frequency domain. The results are provided in dB. Multiple traces display statistical evaluations over carriers.
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Figure 3-8: MER vs Carrier display
Note: This result display is only available if synchronization is successful.
Guard carriers to the left and right of the spectrum are not included in the MER calculation. However, zero cells and the DC carrier are included.
Remote command:
LAY:ADD? '1',RIGH,MVC, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.7, "MER vs Carrier", on page 157
TRACe<n>[:DATA]:X? on page 151
Carrier unit: UNIT:CAXes on page 111
MER vs Symbol
The MER vs. Symbol display shows the MER of each symbol of the analyzed subframe in the time domain. The results are provided in dB. Multiple traces display statistical evaluations over symbols.
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Figure 3-9: MER vs Symbol display
Note: This result display is only available if synchronization is successful.
Guard carriers to the left and right of the spectrum are not included in the MER calculation. However, zero cells and the DC carrier are included.
Remote command:
LAY:ADD? '1',RIGH,MVSY, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.8, "MER vs Symbol", on page 157
TRACe<n>[:DATA]:X? on page 151
Symbol unit: UNIT:SAXes on page 113
MER vs Symbol vs Carrier
The MER vs Symbol vs Carrier display shows the MER of each carrier (frequency
domain) and in each symbol (time domain) of the analyzed subframe.
Figure 3-10: MER vs Symbol vs Carrier display
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The MER values are represented by colors. The corresponding color map is displayed
at the top of the result display.
Note: This result display is only available if synchronization is successful.
Remote command:
LAY:ADD? '1',RIGH,MVSC, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.9, "MER vs Symbol vs Carrier", on page 157
TRACe<n>[:DATA]:X? on page 151
TRACe<n>[:DATA]:Y? on page 151
Carrier unit: UNIT:CAXes on page 111
Symbol unit: UNIT:SAXes on page 113
Group Delay
The Group Delay display shows the relative group delay of the transmission channel
per carrier.
The group delay can only be calculated at valid carrier locations. This means that a
gap appears between the upper and lower half subband for spectrum mode index 9,
10, 22, and 23.
Remote command:
LAY:ADD? '1',RIGH,GDEL, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.11, "Group Delay", on page 158
TRACe<n>[:DATA]:X? on page 151
Carrier unit: UNIT:CAXes on page 111
Impulse Response
The Channel Impulse Response display shows the impulse response of the channel
and its position within the guard interval. The start and the end of the cyclic prefix are
marked with blue lines.
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CP1 describes the cyclic prefix of the beacon. CP2 describes the cyclic prefix of the
data body. The impulse response calculation is based on the data body, hence the
valid echo detection range is indicated by CP2. Multiple traces display statistical evaluations over the upper and lower subband.
Figure 3-11: Channel Impulse Response Display
Remote command:
LAY:ADD? '1',RIGH,IRES, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.12, "Impulse Response", on page 158
TRACe<n>[:DATA]:X? on page 151
Linear/ logarithmic scaling: UNIT:IRESponse on page 112
Magnitude Capture
The capture buffer contains the complete range of captured data for the last sweep.
The Magnitude Capture display shows the power of the captured I/Q data in dBm versus time. The analyzed frames are identified with a green bar at the bottom of the Magnitude Capture display.
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Evaluation Methods for CDR Measurements
Figure 3-12: Magnitude Capture display
Remote command:
LAY:ADD? '1',RIGH,MCAP, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.13, "Magnitude Capture", on page 159
TRACe<n>[:DATA]:X? on page 151
Time unit: UNIT:TAXes on page 113
Marker Table
Displays a table with the current marker values for the active markers.
Remote command:
LAY:ADD? '1',RIGH, MTAB, see LAYout:ADD[:WINDow]? on page 132
Results:
CALCulate<n>:MARKer<m>:X on page 117
CALCulate<n>:MARKer<m>:Y? on page 147
Power vs Carrier
The Power vs. Carrier display shows the power of all OFDM symbols in the analyzed
subframes for each carrier. The power is measured with a resolution bandwidth equal
to the carrier spacing.
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Figure 3-13: Power vs Carrier display
Note: This result display is only available if synchronization is successful.
Remote command:
LAY:ADD? '1',RIGH,PCAR, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.14, "Power vs Carrier", on page 159
TRACe<n>[:DATA]:X? on page 151
Carrier unit: UNIT:CAXes on page 111
Power vs Symbol
The Power vs Symbol display shows the power of all OFDM carriers in the analyzed
subframes for each symbol. The power is measured with a resolution bandwidth equal
to the carrier spacing. Carriers which contain 'Zero'-cells over the complete symbol
range (e.g. guard carriers or DC carrier) are excluded.
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Evaluation Methods for CDR Measurements
Figure 3-14: Power vs Symbol display
Note: This result display is only available if synchronization is successful.
Remote command:
LAY:ADD? '1',RIGH,PSYM, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.15, "Power vs Symbol", on page 159
TRACe<n>[:DATA]:X? on page 151
Symbol unit: UNIT:SAXes on page 113
Power vs Symbol vs Carrier
The Power vs Carrier vs Symbol display shows the power of each carrier (= frequency
domain) in each symbol (= time domain) of the analyzed subframes in dBm. The power
is measured with a resolution bandwidth that equals the carrier spacing.
Figure 3-15: Power vs Symbol vs Carrier display
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Evaluation Methods for CDR Measurements
The power levels are represented by colors. The corresponding color map is displayed
at the top of the result display.
Note: This result display is only available if synchronization is successful.
Remote command:
LAY:ADD? '1',RIGH,PSC, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.16, "Power vs Symbol vs Carrier", on page 160
TRACe<n>[:DATA]:X? on page 151
TRACe<n>[:DATA]:Y? on page 151
Carrier unit: UNIT:CAXes on page 111
Symbol unit: UNIT:SAXes on page 113
Power Spectrum
The Power Spectrum display shows the power in dBm vs frequency results of the complete capture buffer. This display is always available.
Figure 3-16: Power Spectrum display
Remote command:
LAY:ADD? '1',RIGH,PSP, see LAYout:ADD[:WINDow]? on page 132
TRACe:DATA?, see Chapter 7.7.4.17, "Power Spectrum", on page 160
Frequency unit: UNIT:FAXes on page 112
Result Summary
The Result Summary table provides numerical measurement results.
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