Rohde & Schwarz FSWP Series User manual
R&S®FSWP
I/Q Analyzer and Spectrum Monitor
User Manual
User Manual
Version 07
1177585602
(;ÛÈÆ2)
This manual describes the following R&S®FSWP models with firmware version 1.80 or higher:
●R&S®FSWP8 (1322.8003K08)
●R&S®FSWP26 (1322.8003K26)
●R&S®FSWP50 (1322.8003K50)
The Spectrum Monitor is integral part of the R&S FSWP and is always available with firmware versions
1.60 and higher.
The full I/Q Analyzer is integral part of the following options:
●R&S FSWP-B1 (1322.9997.08)
●R&S FSWP-B1 (1322.9997.26)
●R&S FSWP-B1 (1322.9997.50)
© 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: [email protected]
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.
1177.5856.02 | Version 07 | R&S®FSWP
Throughout this manual, products from Rohde & Schwarz are indicated without the ® symbol , e.g. R&S®FSWP is indicated as
R&S FSWP.
Contents
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3User Manual 1177.5856.02 ─ 07
Contents
1 Preface.................................................................................................... 5
1.1 About this Manual......................................................................................................... 5
1.2 Documentation Overview............................................................................................. 6
1.3 Conventions Used in the Documentation...................................................................7
2 Welcome to the I/Q Analyzer Application............................................ 9
2.1 Starting the I/Q Analyzer Application........................................................................10
2.2 Understanding the Display Information.................................................................... 11
3 Measurement and Result Displays.....................................................14
4 Basics on I/Q Data Acquisition and Processing............................... 19
4.1 Processing Analog I/Q Data from RF Input.............................................................. 19
4.2 Basics on Input from I/Q Data Files...........................................................................25
4.3 Receiving and Providing Trigger Signals................................................................. 26
4.4 I/Q Data Import and Export.........................................................................................27
4.5 Basics on FFT..............................................................................................................28
4.6 I/Q Analyzer in MSRA Operating Mode..................................................................... 34
4.7 Measurements in the Time and Frequency Domain................................................ 35
5 Configuration........................................................................................36
5.1 Configuration Overview..............................................................................................36
5.2 Import/Export Functions............................................................................................ 38
5.3 Configuring Data Inputs and Outputs....................................................................... 41
5.4 Configuring the Amplitude.........................................................................................47
5.5 Configuring Frequency Characteristics....................................................................52
5.6 Configuring Triggered Measurements...................................................................... 54
5.7 Data Acquisition and Bandwidth Settings................................................................58
5.8 Display Configuration.................................................................................................65
5.9 Adjusting Settings Automatically..............................................................................66
6 Analysis................................................................................................ 69
6.1 Trace Configuration.................................................................................................... 69
6.2 Marker Settings........................................................................................................... 70
6.3 Display Lines and Limit Lines....................................................................................70
Contents
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4User Manual 1177.5856.02 ─ 07
7 How to Work with I/Q Data.................................................................. 72
7.1 How to Perform Measurements in the I/Q Analyzer Application............................ 72
7.2 How to Export and Import I/Q Data............................................................................73
8 Remote Commands for the I/Q Analyzer........................................... 76
8.1 Introduction................................................................................................................. 76
8.2 Common Suffixes........................................................................................................81
8.3 Activating I/Q Analyzer Measurements.....................................................................81
8.4 Performing Measurements.........................................................................................87
8.5 Retrieving Results.......................................................................................................95
8.6 Configuring I/Q Analyzer Measurements................................................................105
8.7 Analyzing Results..................................................................................................... 146
8.8 Importing and Exporting I/Q Data............................................................................147
8.9 Querying the Status Registers.................................................................................148
8.10 Programming Examples........................................................................................... 149
Annex.................................................................................................. 152
A Annex: Reference...............................................................................152
A.1 Formats for Returned Values: ASCII Format and Binary Format......................... 152
A.2 Reference: Format Description for I/Q Data Files.................................................. 152
A.3 I/Q Data File Format (iq-tar)......................................................................................154
List of Remote Commands (I/Q Analyzer)....................................... 160
Index....................................................................................................163
Preface
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5User Manual 1177.5856.02 ─ 07
1 Preface
1.1 About this Manual
This R&S FSWP I/Q Analyzer User Manual provides all the information specific to the
application and processing I/Q data. All general instrument functions and settings
common to all applications are described in the main R&S FSWP 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 I/Q Analyzer application
Introduction to and getting familiar with the application
●Typical Applications for the I/Q Analyzer and optional input interfaces
Example measurement scenarios for I/Q data import and analysis
●Measurements and Result Displays
Details on supported measurements and their result types
●Basics on I/Q Data Acquisition
Background information on basic terms and principles in the context of the I/Q Ana-
lyzer application as well as processing I/Q data in general
●Configuration and Analysis
A concise description of all functions and settings available to import, capture and
analyze I/Q data in the I/Q Analyzer, with or without optional interfaces, with their
corresponding remote control command
●How to Work with I/Q Data
The basic procedure to perform an I/Q Analyzer measurement or capture data via
the R&S Digital Baseband Interface with step-by-step instructions
●Optimizing and Troubleshooting the Measurement
Hints and tips on how to handle errors and optimize the test setup
●Remote Commands to perform Measurements with I/Q Data
Remote commands required to configure and perform I/Q Analyzer measurements
or process digital I/Q data in a remote environment, sorted by tasks;
(Commands required to set up the environment or to perform common tasks on the
instrument are provided in the main R&S FSWP User Manual.)
Programming examples demonstrate the use of many commands and can usually
be executed directly for test purposes.
●Annex
Reference material, e.g. I/Q file formats and a detailed description of the LVDS
connector
●List of remote commands
Alphabetical list of all remote commands described in the manual
●Index
About this Manual
Preface
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6User Manual 1177.5856.02 ─ 07
1.2 Documentation Overview
This section provides an overview of the R&S FSWP user documentation. Unless
specified otherwise, you find most of the documents on the R&S FSWP product page
at:
www.rohde-schwarz.com/manual/fswp
1.2.1 Getting Started Manual
Introduces the R&S FSWP and describes how to set up and start working with the
product. Includes basic operations, typical measurement examples, and general infor-
mation, e.g. safety instructions, etc.
A printed version is delivered with the instrument. A PDF version is available for down-
load on the Internet.
1.2.2 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 com-
mands with programming examples, and information on maintenance, instrument
interfaces and error messages. Includes the contents of the getting started manual.
●Manuals for (optional) firmware applications
Contains the description of the specific functions of a firmware application, includ-
ing remote control commands. Basic information on operating the R&S FSWP is
not included.
The contents of the user manuals are available as help in the R&S FSWP. 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 Inter-
net.
1.2.3 Service Manual
Describes the performance test for checking the rated specifications, module replace-
ment and repair, firmware update, troubleshooting and fault elimination, and contains
mechanical drawings and spare part lists.
The service manual is available for download for registered users on the global
Rohde & Schwarz information system (GLORIS):
https://gloris.rohde-schwarz.com
Documentation Overview
Preface
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7User Manual 1177.5856.02 ─ 07
1.2.4 Instrument Security Procedures
Deals with security issues when working with the R&S FSWP in secure areas. It is
available for download on the Internet.
1.2.5 Basic Safety Instructions
Contains safety instructions, operating conditions and further important information.
The printed document is delivered with the instrument.
1.2.6 Data Sheets and Brochures
The data sheet contains the technical specifications of the R&S FSWP. It also lists the
options and their order numbers, and optional accessories.
The brochure provides an overview of the instrument and deals with the specific char-
acteristics.
See www.rohde-schwarz.com/brochure-datasheet/fswp
1.2.7 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/fswp
1.2.8 Application Notes, Application Cards, White Papers, etc.
These documents deal with special applications or background information on particu-
lar topics.
See www.rohde-schwarz.com/application/fswp
1.3 Conventions Used in the Documentation
1.3.1 Typographical Conventions
The following text markers are used throughout this documentation:
Conventions Used in the Documentation
Preface
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8User Manual 1177.5856.02 ─ 07
Convention Description
"Graphical user interface ele-
ments"
All names of graphical user interface elements on the screen, such as
dialog boxes, menus, options, buttons, and softkeys are enclosed by
quotation marks.
[Keys] Key and knob names are enclosed by square brackets.
Filenames, commands,
program code
Filenames, commands, coding samples and screen output are distin-
guished by their font.
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-
tion marks.
1.3.2 Conventions for Procedure Descriptions
When operating the instrument, several alternative methods may be available to per-
form the same task. In this case, the procedure using the touchscreen is described.
Any elements that can be activated by touching can also be clicked using an addition-
ally connected mouse. The alternative procedure using the keys on the instrument or
the on-screen keyboard is only described if it deviates from the standard operating pro-
cedures.
The term "select" may refer to any of the described methods, i.e. using a finger on the
touchscreen, a mouse pointer in the display, or a key on the instrument or on a key-
board.
1.3.3 Notes on Screenshots
When describing the functions of the product, we use sample screenshots. These
screenshots are meant to illustrate as many as possible of the provided functions and
possible interdependencies between parameters. The shown values may not represent
realistic usage scenarios.
The screenshots usually show a fully equipped product, that is: with all options instal-
led. Thus, some functions shown in the screenshots may not be available in your par-
ticular product configuration.
Conventions Used in the Documentation
Welcome to the I/Q Analyzer Application
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9User Manual 1177.5856.02 ─ 07
2 Welcome to the I/Q Analyzer Application
The R&S FSWP I/Q Analyzer is a firmware application that adds functionality to per-
form I/Q data acquisition and analysis to the R&S FSWP.
The R&S FSWP I/Q Analyzer features:
●Acquisition of analog I/Q data
●Import of stored I/Q data from other applications
●Spectrum, magnitude, I/Q vector and separate I and Q component analysis of any
I/Q data on the instrument
●Export of I/Q data to other applications
Availability of the I/Q Analyzer and Spectrum Monitor
The full I/Q Analyzer becomes available when you equip the R&S FSWP with the
optional Spectrum Analyzer hardware (R&S FSWP-B1).
You can still analyze I/Q data without this hardware option in the Spectrum Monitor
application.
It runs on the phase noise analyzer hardware and is available for free with firmware
version 1.60.
Compared to the full I/Q analyzer, which runs on the optional spectrum analyzer hard-
ware, it has the following characteristics and limitations.
●When you open a spectrum monitor, the frequency, level and input parameters are
initially adopted from the phase noise application (you can change them in the
spectrum monitor, of course).
Those settings are the same as in the full I/Q analyzer.
●Maximum analysis bandwidth of 20 MHz and sample rate of 25 MHz (and no sup-
port of bandwidth extensions).
●Advanced data acquisition settings are unavailable.
●I/Q data import and export are the same as in the full I/Q analyzer.
●Spectrograms, general marker functionality, marker functions and limit lines are the
same as in the full I/Q analyzer.
●Only external triggers are supported.
●Only evaluation of the frequency spectrum is supported.
●Trace mathematics are not available.
All other functionality is the same as that of the I/Q analyzer.
This user manual contains a description of the functionality that the application pro-
vides, including remote control operation.
All functions not discussed in this manual are the same as in the base unit and are
described in the R&S FSWP User Manual. The latest version is available for download
at the product homepage http://www.rohde-schwarz.com/product/fswp.
Welcome to the I/Q Analyzer Application
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10User Manual 1177.5856.02 ─ 07
Additional information
Several application notes discussing I/Q analysis are available from the Rohde &
Schwarz website:
1EF85: Converting R&S I/Q data files
1EF92: Wideband Signal Analysis
1MA257: Wideband mm-Wave Signal Generation and Analysis
1EF84: Differential measurements with Spectrum Analyzers and Probes
Installation
The R&S FSWP I/Q Analyzer application is part of the optional Spectrum application
and requires no further installation.
2.1 Starting the I/Q Analyzer Application
The I/Q Analyzer is an application on the R&S FSWP.
To activate the I/Q Analyzer application
1. Select the [MODE] key.
A dialog box opens that contains all applications currently available on your
R&S FSWP.
2. Select the "I/Q Analyzer" item.
The R&S FSWP opens a new channel for the I/Q Analyzer application.
The measurement is started immediately with the default settings.
It can be configured in the I/Q Analyzer "Overview" dialog box, which is displayed
when you select the "Overview" softkey from any menu (see Chapter 5, "Configura-
tion", on page 36).
Multiple Channels and Sequencer Function
When you activate an application, a new channel is created which determines the
measurement settings for that application (channel). The same application can be acti-
vated 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 avail-
able memory on the instrument.
Starting the I/Q Analyzer Application
Welcome to the I/Q Analyzer Application
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11User Manual 1177.5856.02 ─ 07
Only one measurement can be performed at any time, namely the one in the currently
active channel. However, in order to perform the configured measurements consecu-
tively, a Sequencer function is provided.
If activated, the measurements configured in the currently defined channels are per-
formed one after the other in the order of the tabs. The currently active measurement is
indicated by a symbol in the tab label.
The result displays of the individual channels are updated in the tabs (as well as the
"MultiView" ) as the measurements are performed. Sequential operation itself is inde-
pendent of the currently displayed tab.
For details on the Sequencer function see the R&S FSWP User Manual.
2.2 Understanding the Display Information
The following figure shows a measurement diagram during I/Q Analyzer operation. All
different information areas are labeled. They are explained in more detail in the follow-
ing sections.
Figure 2-1: Screen elements in the I/Q Analyzer application
1 = Channel bar for firmware and measurement settings
2+3 = Window title bar with diagram-specific (trace) information
4 = Diagram area with marker information
5 = Diagram footer with diagram-specific information, depending on result display
6 = Instrument status bar with error messages and date/time display
Understanding the Display Information
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12User Manual 1177.5856.02 ─ 07
MSRA operating mode
In MSRA operating mode, additional tabs and elements are available. A colored back-
ground of the screen behind the channel tabs indicates that you are in MSRA operating
mode.
For details on the MSRA operating mode see the R&S FSWP MSRA User Manual.
Channel bar information
In the I/Q Analyzer application, the R&S FSWP shows the following settings:
Table 2-1: Information displayed in the channel bar for the I/Q Analyzer application
Ref Level Reference level
Att RF attenuation
Ref Offset Reference level offset
Freq Center frequency
Meas Time Measurement time
Rec Length Defined record length (number of samples to capture)
SRate Defined sample rate for data acquisition
RBW (Spectrum evaluation only) Resolution bandwidth calculated from the
sample rate and record length
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 dis-
played only when applicable for the current measurement. For details see the
R&S FSWP Getting Started manual.
Window title bar information
For each diagram, the header provides the following information:
Figure 2-2: Window title bar information in the I/Q Analyzer application
1 = Window number
2 = Window type
3 = Trace color
4 = Trace number
5 = Detector
6 = Trace mode
Diagram footer information
The information in the diagram footer (beneath the diagram) depends on the evalua-
tion:
Understanding the Display Information
Welcome to the I/Q Analyzer Application
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13User Manual 1177.5856.02 ─ 07
●Center frequency
●Number of sweep points
●Range per division (x-axis)
●Span (Spectrum)
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.
Understanding the Display Information
Measurement and Result Displays
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14User Manual 1177.5856.02 ─ 07
3 Measurement and Result Displays
Access: "Overview" > "Display Config"
Or: [MEAS] > "Display Config"
The I/Q Analyzer can capture I/Q data. The I/Q data that was captured by or imported
to the R&S FSWP can then be evaluated in various different result displays. Select the
result displays using the SmartGrid functions.
Up to 6 evaluations can be displayed in the I/Q Analyzer at any time, including several
graphical diagrams, marker tables or peak lists.
For details on working with the SmartGrid see the R&S FSWP Getting Started manual.
Note that the Spectrum Monitor only supports the "Spectrum" result display.
Measurements in the time and frequency domain
The I/Q Analyzer application (not Master in MSRA mode) can also perform measure-
ments on the captured I/Q data in the time and frequency domain (see also Chap-
ter 4.6, "I/Q Analyzer in MSRA Operating Mode", on page 34). They are configured
using the same settings and provide similar results. In addition, the analysis interval
used for the measurement is indicated as in all multistandard applications.
The time and frequency domain measurements and the available results are described
in detail in the R&S FSWP User Manual.
Result displays for I/Q data:
Magnitude .................................................................................................................... 14
Spectrum ......................................................................................................................15
I/Q-Vector ..................................................................................................................... 16
Real/Imag (I/Q) .............................................................................................................16
Marker Table ................................................................................................................ 17
Marker Peak List .......................................................................................................... 18
Magnitude
Shows the level values in time domain.
Measurement and Result Displays
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Remote command:
LAY:ADD:WIND? '1',RIGH,FREQ, see LAYout:ADD[:WINDow]? on page 140
Results:
TRACe<n>[:DATA]? on page 100
I/Q-Vector
Displays the captured samples in an I/Q-plot. The samples are connected by a line.
Note: For the I/Q vector result display, the number of I/Q samples to record ( "Record
Length" ) must be identical to the number of trace points to be displayed ("Sweep
Points"; for I/Q Analyzer: 10001). For record lengths outside the valid range of sweep
points the diagram does not show valid results.
Remote command:
LAY:ADD:WIND? '1',RIGH,VECT, see LAYout:ADD[:WINDow]? on page 140
Results:
TRACe<n>[:DATA]? on page 100
Real/Imag (I/Q)
Displays the I and Q values in separate diagrams.
Measurement and Result Displays
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17User Manual 1177.5856.02 ─ 07
Remote command:
LAY:ADD:WIND? '1',RIGH,RIM, see LAYout:ADD[:WINDow]? on page 140
Results:
TRACe<n>[:DATA]? on page 100
Marker Table
Displays a table with the current marker values for the active markers.
This table is displayed automatically if configured accordingly.
Type Shows the marker type and number ("M" for a nor-
mal marker, "D" for a delta marker).
Ref Shows the reference marker that a delta marker
refers to.
Trace Shows the trace that the marker is positioned on.
X- / Y-Value Shows the marker coordinates (usually frequency
and level).
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 140
Results:
CALCulate<n>:MARKer<m>:X on page 104
CALCulate<n>:MARKer<m>:Y on page 105
Measurement and Result Displays
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18User Manual 1177.5856.02 ─ 07
Marker Peak List
The marker peak list determines the frequencies and levels of peaks in the spectrum or
time domain. How many peaks are displayed can be defined, as well as the sort order.
In addition, the detected peaks can be indicated in the diagram. The peak list can also
be exported to a file for analysis in an external application.
Tip: To navigate within long marker peak lists, simply scroll through the entries with
your finger on the touchscreen.
Remote command:
LAY:ADD? '1',RIGH, PEAK, see LAYout:ADD[:WINDow]? on page 140
Results:
CALCulate<n>:MARKer<m>:X on page 104
CALCulate<n>:MARKer<m>:Y on page 105
Basics on I/Q Data Acquisition and Processing
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4 Basics on I/Q Data Acquisition and Pro-
cessing
Some background knowledge on basic terms and principles used when describing I/Q
data acquisition on the R&S FSWP in general, and in the I/Q Analyzer application in
particular, is provided here for a better understanding of the required configuration set-
tings.
The I/Q Analyzer provides various possibilities to acquire the I/Q data to be analyzed:
●Capturing analog I/Q data from the "RF Input" connector
●Importing I/Q data from a file
Background information for all these scenarios and more is provided in the following
sections.
●Processing Analog I/Q Data from RF Input.............................................................19
●Basics on Input from I/Q Data Files........................................................................ 25
●Receiving and Providing Trigger Signals................................................................ 26
●I/Q Data Import and Export..................................................................................... 27
●Basics on FFT.........................................................................................................28
●I/Q Analyzer in MSRA Operating Mode.................................................................. 34
●Measurements in the Time and Frequency Domain............................................... 35
4.1 Processing Analog I/Q Data from RF Input
Complex baseband data
In the telephone systems of the past, baseband data was transmitted unchanged as an
analog signal. In modern phone systems and in radio communication, however, the
baseband data is modulated on a carrier frequency, which is then transmitted. The
receiver must demodulate the data based on the carrier frequency. When using mod-
ern modulation methods (e.g. QPSK, QAM etc.), the baseband signal becomes com-
plex. Complex data (or: I/Q data) consists of an imaginary (I) and a real (Q) compo-
nent.
Sweep vs sampling
The standard Spectrum application on the R&S FSWP performs frequency sweeps on
the input signal and measurements in the frequency and time domain. Other applica-
tions on the R&S FSWP, such as the I/Q Analyzer, sample and process the individual I
and Q components of the complex signal.
I/Q Analyzer - processing complex data from RF input
The I/Q Analyzer is a standard application used to capture and analyze I/Q data on the
R&S FSWP. By default, it assumes the I/Q data is modulated on a carrier frequency
and input via the "RF Input" connector on the R&S FSWP.
Processing Analog I/Q Data from RF Input
Basics on I/Q Data Acquisition and Processing
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20User Manual 1177.5856.02 ─ 07
The A/D converter samples the IF signal at a rate of 200 MHz. The digital signal is
down-converted to the complex baseband, lowpass-filtered, and the sample rate is
reduced. The analog filter stages in the analyzer cause a frequency response which
adds to the modulation errors. An equalizer filter before the resampler compensates
for this frequency response. The continuously adjustable sample rates are realized
using an optimal decimation filter and subsequent resampling on the set sample rate.
A dedicated memory (capture buffer) is available in the R&S FSWP for a maximum of
400 Msamples (400*1000*1000) of complex samples (pairs of I and Q data). The num-
ber of complex samples to be captured can be defined (for restrictions refer to Chap-
ter 4.1.1, "Sample Rate and Maximum Usable I/Q Bandwidth for RF Input",
on page 21).
The block diagram in Figure 4-1 shows the analyzer hardware from the IF section to
the processor.
Figure 4-1: Block diagram illustrating the R&S
FSWP signal processing for analog I/Q data (without
bandwidth extension options)
Figure 4-2: Block diagram illustrating the R&S
FSWP signal processing for analog I/Q data (with
option B320)
Processing Analog I/Q Data from RF Input
This manual suits for next models
6
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