R&S® FSV-K70
Firmware Option Vector Signal
Analysis
Getting Started
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Getting Started
Test & Measurement
This manual describes the following R&S®FSV options:
● R&S FSV-K70 (1310.8455.02)
This manual is applicable for the following analyzer models with firmware version 1.61 and higher:
R&S®FSV 3 (1307.9002K03)
●
R&S®FSV 7 (1307.9002K07)
●
R&S®FSV 13 (1307.9002K13)
●
R&S®FSV 30 (1307.9002K30)
●
R&S®FSV 40 (1307.9002K39)
●
R&S®FSV 40 (1307.9002K40)
●
The firmware of the instrument makes use of several valuable open source software packages. For information, see the "Open Source
Acknowledgement" on the user documentation CD-ROM (included in delivery).
Rohde & Schwarz would like to thank the open source community for their valuable contribution to embedded computing.
© 2011 Rohde & Schwarz GmbH & Co. KG
Muehldorfstr. 15, 81671 Munich, Germany
Phone: +49 89 41 29 - 0
Fax: +49 89 41 29 12 164
E-mail: info@rohde-schwarz.com
Internet: http://www.rohde-schwarz.com
Printed in Germany – Subject to change – Data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
The following abbreviations are used throughout this manual: R&S®FSV is abbreviated as R&S FSV.
R&S® FSV-K70
1 Preface....................................................................................................5
1.1 Documentation Overview.............................................................................................5
1.2 Conventions Used in the Documentation...................................................................6
2 Brief Introduction to Vector Signal Analysis.......................................7
3 Connecting the Transmitter and Analyzer...........................................8
4 Measurement Example 1: Continuous QPSK Signal..........................9
4.1 Transmitter Settings.....................................................................................................9
4.2 Analyzer Settings........................................................................................................11
4.3 Changing the Display Configuration.........................................................................13
4.4 Navigating Through the Capture Buffer....................................................................16
Contents
Contents
4.5 Averaging Several Evaluations..................................................................................17
5 Measurement Example 2: Burst GSM EDGE Signals.......................19
5.1 Transmitter Settings...................................................................................................19
5.2 Analyzer Settings........................................................................................................21
5.3 Navigating Through the Capture Buffer....................................................................22
5.4 Evaluating the Rising and Falling Edges..................................................................23
5.5 Setting the Evaluation Range....................................................................................24
5.6 Comparing the Measurement Signal to the Reference Signal................................26
6 Brief Overview of the Operating Philosophy.....................................28
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1 Preface
Preface
Documentation Overview
When equipped with application firmware R&S FSV-K70, the analyzer performs vector
measurements on digitally modulated signals in the time domain. Based on the vector
measurements, further evaluations, e.g. statistical evaluations, can be performed.
1.1 Documentation Overview
The user documentation for the R&S FSV-K70 application is divided as follows:
Getting Started
●
Operating Manual
●
Online Help
●
Getting Started
With the help of a few sample measurements for the digital GSM and EDGE standards,
this document provides a quick introduction to typical vector analyzer measurements.
The individual measurements are in logical order and are meant to familiarize you gradually with the measurements required of general vector signal analysis.
Transmitter operation is only described as far as required for performing the measurements. For more details on the measurements, refer to the test transmitter documentation.
Operating Manual
The operating manual describes the specific instrument functions of the option in detail.
It also includes background information on vector signal analysis, as well as troubleshooting information.
For additional information on default settings and parameters, refer to the data sheets.
Basic information on operating the R&S FSV is not included, see the base unit documentation for that.
Online Help
The online help contains context-specific help on operating the R&S FSV, including the
K70 option. It describes both manual and remote operation. The online help is installed
on the R&S FSV by default.
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R&S® FSV-K70
Preface
Conventions Used in the Documentation
1.2 Conventions Used in the Documentation
1.2.1 Typographical Conventions
The following text markers are used throughout this documentation:
Convention Description
"Graphical user interface elements" 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 names are written in capital letters.
File names, commands, program code
Input Input to be entered by the user is displayed in italics.
Links Links that you can click are displayed in blue font.
"References" References to other parts of the documentation are
File names, commands, coding samples and screen
output are distinguished by their font.
enclosed by quotation marks.
1.2.2 Conventions for Procedure Descriptions
When describing how to operate the instrument, several alternative methods may be
available to perform the same task. In this case, the procedure using the touch screen is
described. Any elements that can be activated by touching can also be clicked using an
additionally connected mouse. The alternative procedure using the keys on the instrument or the on-screen keyboard is only described if it deviates from the standard operating procedures.
The term "select" may refer to any of the described methods, i.e. using a finger on the
touchscreen, a mouse pointer in the display, or a key on the instrument or on a keyboard.
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2 Brief Introduction to Vector Signal Analysis
Brief Introduction to Vector Signal Analysis
In this chapter we provide a brief overview of vector signal analysis. For detailed information see the R&S FSV-K70 Operating manual.
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 how the ideal signal would look. Hence, the analyzer aims to reconstruct the
ideal signal from the measured signal that is transmitted by the DUT. This ideal signal is
commonly referred to as the reference signal, while the signal from the DUT is called the
measurement signal.
After the extraction of the reference signal, the measurement signal and the reference
signal are compared by the vector signal analysis software and the results of this comparison are displayed on the analyzer screen.
The most common vector signal analysis measurement is the EVM (Error Vector Magnitude) measurement. Here, the complex baseband reference signal is subtracted from
the complex baseband measurement signal. The magnitude of this error vector represents the EVM value. The EVM has the advantage that it "summarizes" all potential errors
and distortions in one single value. If the EVM value is low, the signal quality of the DUT
is high.
Fig. 2-1: Simplified schema of vector signal analysis
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R&S® FSV-K70
3 Connecting the Transmitter and Analyzer
Connecting the Transmitter and Analyzer
In order to perform measurements with the R&S FSV-K70, you require a test transmitter
to emulate a DUT. For measurement example 2 (see chapter 5, "Measurement Example
2: Burst GSM EDGE Signals", on page 19), the test transmitter needs to be GSM-
compatible. It is recommended that you use an R&S®SMU (order number 1141.2005.02)
with the digital standard option GSM/EDGE (order number 1160.7609.02).
Connect the RF output of the R&S SMU with the RF input of the R&S FSV.
Fig. 3-1: Connection to a test transmitter (for example R&S SMU)
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4 Measurement Example 1: Continuous QPSK
Measurement Example 1: Continuous QPSK Signal
Transmitter Settings
Signal
In this measurement example a continuous QPSK (Quadrature Phase Shift Keying) signal will be measured and evaluated. QPSK is used in several standards such as DVBS2, APCO25, WCDMA, CDMA2000, etc. For the description (characterization) of a continuous QPSK signal, the following parameters are the most important:
Carrier Frequency
●
Level
●
Symbol Rate
●
Transmit Filter
●
4.1 Transmitter Settings
This section summarizes the necessary transmitter settings. It contains a list of the
parameters and step-by-step instructions for the R&S SMU. If you are interested in a
more detailed description or background information, refer to the user manual of the R&S
SMU, which can be downloaded from the Rohde&Schwarz website: www.rohde-
schwarz.com/downloads/manuals/smu200A.html.
Frequency 1 GHz
Level 0 dBm
Modulation QPSK
Symbol Rate 1 Msym/s
Filter Root Raised Cosine with Roll-Off 0.35
To define the settings for the R&S SMU
1. Press the PRESET key to start from a defined state.
2. Press the FREQ key and enter 1 GHz.
3. Press the LEVEL key and enter 0 dBm.
4. To define the modulation:
a) Press the DIAGRAM key.
b) Select the first block ("Baseband A") in the settings overview and press ENTER.
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