R&S SMW-K550 User manual

R&S®SMW-K550
Stream Extender
User Manual
User Manual
1178.3263.02 ─ 01
(;ÜPÍ2)
Test & Measurement

This document describes the following software options:
●R&S®SMW-K550
1413.7315.xx
This manual describes firmware version FW 3.20.459.xx and later of the R&S®SMW200A.
© 2016 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: [phone] - 0
Fax: [phone]
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.
The following abbreviations are used throughout this manual: R&S®SMW200A is abbreviated as R&S SMW; the license types
02/03/07/11/13/16/12 are abbreviated as xx.

Contents
R&S®SMW-K550
3User Manual 1178.3263.02 ─ 01
Contents
1 Preface.................................................................................................... 5
1.1 About this Manual......................................................................................................... 5
1.2 Documentation Overview............................................................................................. 5
1.3 Conventions Used in the Documentation...................................................................7
1.3.1 Typographical Conventions.............................................................................................7
1.3.2 Conventions for Procedure Descriptions.........................................................................8
1.3.3 Notes on Screenshots.....................................................................................................8
2 Welcome to the R&S SMW-K550 Option..............................................9
2.1 Accessing the Settings.................................................................................................9
2.2 Scope........................................................................................................................... 10
3 Stream Extender Related Settings..................................................... 11
4 Application Example: GSM AM Suppression Test............................13
4.1 Required Options........................................................................................................ 13
4.2 About the AM Suppression Testing.......................................................................... 13
4.3 How to Generate Signals for GSM AM Suppression Tests..................................... 15
5 Remote Control Commands................................................................21
Glossary: 3GPP Specifications, References, Documents with Fur-
ther Information....................................................................................23
List of Commands................................................................................24
Index......................................................................................................25

Contents
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4User Manual 1178.3263.02 ─ 01

Preface
R&S®SMW-K550
5User Manual 1178.3263.02 ─ 01
1 Preface
1.1 About this Manual
This user manual provides all the information specific to the option R&S SMW-K550.
All general instrument functions and settings common to all applications and operating
modes are described in the main R&S SMW user manual.
The main focus in this manual is on the provided settings and the tasks required to
generate a signal. The following topics are included:
●Welcome to the Stream Extender option R&S SMW-K550
Introduction to and getting familiar with the option
●About the GSM AM Suppression Tests
Background information on basic terms and principles in the context of the signal
generation
●Configuration and Settings
A concise description of all functions and settings available to configure signal gen-
eration with their corresponding remote control command
●How To Generate Signals for the GSM AM Suppression Tests
The basic procedure to perform signal generation tasks and step-by-step instruc-
tions for more complex tasks or alternative methods
As well as detailed examples to guide you through typical signal generation sce-
narios and allow you to try out the application immediately
●Remote Control Commands
Remote commands required to configure and perform signal generation in a
remote environment, sorted by tasks
(Commands required to set up the instrument or to perform common tasks on the
instrument are provided in the main R&S SMW user manual)
Programming examples demonstrate the use of many commands and can usually
be executed directly for test purposes
●List of remote commands
Alphabetical list of all remote commands described in the manual
●Index
1.2 Documentation Overview
The user documentation for the R&S SMW consists of the following parts:
●Getting started, printed manual
●Online help system on the instrument, incl. tutorials
●User manuals and online manual, see the product page
●Service manual, provided on the internet for registered users
●Instrument security procedures, see the product page
Documentation Overview

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6User Manual 1178.3263.02 ─ 01
●General safety instructions, printed brochure
●Release notes, see the product page (download > firmware)
●Data sheet and brochures, see the product page (download > brochures and data
sheets)
●Application notes, provided on the internet
You find the user documentation on the R&S SMW product page mainly at:
www.rohde-schwarz.com/product/SMW200A > "Downloads" > "Manuals"
Additional download paths are stated directly in the following abstracts of the docu-
mentation types.
Getting Started
Introduces the R&S SMW and describes how to set up and start working with the prod-
uct. Includes basic operations, typical measurement examples, and general informa-
tion, e.g. safety instructions, etc.
Online Help and Tutorials
The online help offers quick, context-sensitive access to the information needed for
operation and programming. It contains the description for the base unit and the soft-
ware options.
The tutorials offer guided examples and demonstrations on operating the R&S SMW.
User Manual and Online Manual
Separate manuals are provided for the base unit and the software options:
●Base unit manual
Contains the description of the graphical user interface, an introduction to remote
control, the description of all SCPI remote control commands, programming exam-
ples, and information on maintenance, instrument interfaces and error messages.
Includes the contents of the getting started manual.
●Software option manuals
Describe the specific functions of an option. Basic information on operating the
R&S SMW is not included.
The online manual provides the contents of the user manual for immediate display on
the internet.
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 registered users on the global Rohde & Schwarz
information system (GLORIS, https://gloris.rohde-schwarz.com).
Documentation Overview

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7User Manual 1178.3263.02 ─ 01
Instrument Security Procedures
Deals with security issues when working with the R&S SMW in secure areas.
Data Sheets and Brochures
The data sheet contains the technical specifications of the R&S SMW. Brochures pro-
vide an overview of the instrument and deal with the specific characteristics, see
www.rohde-schwarz.com/product/SMW200A > "Download" > "Brochures and Data
Sheets".
General Safety Instructions
Contains basic safety instructions in English, Spanish, German and French.
Release Notes
Describes the firmware installation, new and modified features and fixed issues
according to the current firmware version. You find the latest version at:
www.rohde-schwarz.com/product/SMW200A > "Downloads" > "Firmware"
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/appnotes.
1.3 Conventions Used in the Documentation
1.3.1 Typographical Conventions
The following text markers are used throughout this documentation:
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 names are written in capital letters.
File names, commands,
program code
File names, 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.
Conventions Used in the Documentation

Preface
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1.3.2 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 touchscreen
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 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 much as possible of the provided functions and
possible interdependencies between parameters. The shown values may not represent
realistic test situations.
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 R&S SMW-K550 Option
R&S®SMW-K550
9User Manual 1178.3263.02 ─ 01
2 Welcome to the R&S SMW-K550 Option
The R&S SMW-K550 is a software option that allows you to duplicate generated base-
band signals (streams) for specific system configurations. By that means, four base-
band streams with real-time data sources can be generated in parallel. The generated
signals are suitable for test cases such as the GSM AM Suppression Test as specified
in 3GPP TS 51.021.
The duplicated baseband streams are of identical content. If shifted in frequency, they
appear to the receiver under test as different signals.
R&S SMW-K550 key features:
●Generation of up to 8 streams out of 4 baseband signals
●Generation of 4 signals with real-time data source, for example to ensure non-trun-
cated PN sequences
●Generation of wanted and interfering signals as required for the GSM AM suppres-
sion tests
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 SMW user manual. The latest version is available at the
R&S SMW product page >"Downloads" > "Manuals".
Installation
You can find detailed installation instructions in the delivery of the option or in the
R&S SMW Service Manual.
2.1 Accessing the Settings
To open the dialog with the required settings
► In the taskbar R&S SMW, select the "System Configuration > System Configura-
tion".
Accessing the Settings

Welcome to the R&S SMW-K550 Option
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2.2 Scope
Tasks (in manual or remote operation) that are also performed in the base unit in the
same way are not described here.
In particular, this includes:
●Managing settings and data lists, like storing and loading settings, creating and
accessing data lists, or accessing files in a particular directory.
●Information on regular trigger, marker and clock signals, and filter settings, if appro-
priate.
●General instrument configuration, such as checking the system configuration, con-
figuring networks and remote operation
●Using the common status registers
For a description of such tasks, see the R&S SMW user manual.
Scope

Stream Extender Related Settings
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3 Stream Extender Related Settings
Duplicting streams is a feature that requires the additional option R&S SMW-K550.
Access:
1. In the task bar R&S SMW, select the "System Configuration > System Configura-
tion".
2. In the "Fading/Baseband Configuration" dialog, select "Mode > Advanced".
3. Enable a 3x1x1 or a 4x1x1 configuration
4. Select "Duplicate Streams > On".
Confirm with "Apply"
With the selected configuration the instrument generates 6 streams, where each
two of them are of identical content.
The streams are independently processed, i.e. noise can be added and the
streams can be shifted in frequency.
The block diagram confirms the configuration, too.

Stream Extender Related Settings
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For step-by-step description on how to use the provided settings, refer to Chapter 4,
"Application Example: GSM AM Suppression Test", on page 13.
Settings:
System Configuration > Fading/Baseband Configuration............................................. 12
└Duplicate Streams...........................................................................................12
System Configuration > Fading/Baseband Configuration
Available are the standard settings and the following parameter, dedicated for the
option R&S SMW-K550.
Duplicate Streams ← System Configuration > Fading/Baseband Configuration
(requires option R&S SMW-K550)
This parameter is enabled in the configurations 3x1x1 and 4x1x1.
In a 3x1x1 configuration for example, there are (per default) 3 basebands and 3
streams. The first two basebands can generate signals with real-time data sources.
If "Duplicate Streams > On", created is a copy of each stream after baseband / fading
block. Generated are 6 streams; 4 of them can use real-time data sources, for example
to ensure non-truncated PN sequences.
The pair of streams created out of the same baseband are identical, in terms of con-
tent, power level and frequency. The streams are treated as individual streams in
terms of adding AWGN and shifting within the available RF bandwidth.
This feature is useful, if your test setup requires a combination of max 4 signals with
real-time data source and 4 ARB signals. For example, for performing GSM AM sup-
pression tests according to 3GPP TS 51.021, chapter 8.
See user manual R&S®SMW-K550 Stream Extender.
Remote command:
:SCONfiguration:DUPLicate[:STReam] on page 22

Application Example: GSM AM Suppression Test
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13User Manual 1178.3263.02 ─ 01
4 Application Example: GSM AM Suppression
Test
AM suppression testing is one of the base station (BS) receiver tests, specified in
3GPP TS 51.021.
According to the specification, the testing of multi-carrier base stations (BS) equipped
with multi-carrier receiver requires up to four wanted and one interfering signals.
A typical signal generator generates one or two test signals. The test setup for AM sup-
pression tests of a multi-carrier BS would then require two or more signal generators.
Such setup can require extensive configurations and complex synchronization.
In R&S SMW equipped with option R&S SMW-K550, the generation of 4 wanted and
one interfering GSM signals is a straightforward solution. This section is a short intro-
duction in the AM suppression testing. It also shows how to use the dedicated func-
tions to generate, route and output the required signals.
The following example shows the configuration principle in general.
Not all required settings are shown. The used settings do not comply with the specifi-
cation.
4.1 Required Options
The equipment layout includes:
●Option standard Baseband Generator (R&S SMW-B10) per signal path and
Option Baseband main module, with two I/Q paths (R&S SMW-B13T)
●Option Frequency (R&S SMW-B10x) for signal path A
●Option Frequency (R&S SMW-B20x) for signal path B
●Option Multiple Entities (R&S SMW-K76)
●Option Stream Extender (R&S SMW-K550)
●2x option GSM/EDGE and EDGE Evolution (R&S SMW-K40/-K41)
For more information, refer to the instrument specification (data sheet).
4.2 About the AM Suppression Testing
Receiver measurements are tests of the ability of a BS receiver to demodulate signals
while achieving specified minimum bit error rate (BER). Several test cases are speci-
fied. Their goal is to assure the GSM performance in different conditions, like for exam-
ple low signal power or intermodulation. The AM suppression test for example is a
receiver test that measure the receiver ability to cope with strong GSMK interfering sig-
nal.
About the AM Suppression Testing

Application Example: GSM AM Suppression Test
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Simplified test setup for base station receiver testing
The Figure 4-1 shows a simplified example of a test setup for AM suppression tests.
Figure 4-1: Simplified test setup for AM suppression tests of multi-carrier BS equipped with multi-
carrier receiver
1 = Baseband A and B generate the wanted signals
2 = Baseband C generates the interfering signal. Signal is routed to the second RF out-
put because of the difference in the power levels of the interfering and the wanted
signals (high dynamic range)
BS = Base station
BER/BLER = Bit error rate (BER) and block error rate (BLER) measurements
Rx = Receiver input
Reference Fre-
quency
= 10 MHz synchronization signal form the BS to the R&S SMW
Trigger Signal = Optional trigger signal from the BS to the R&S SMW
RF A,RF B,USER = Front panel connectors
REF IN = Rear panel connector
⊕= RF combiner
The R&S SMW in this setup generates four GSM wanted signals and one interfering
signal. The wanted signals are routed to and output at the RF A connector. The inter-
fering signal to the RF B connector. The interfering signal and the wanted signals are
routed to two separate RF outputs because of the difference in their power levels. Both
RF signals are connected to a combiner. The sum signal is fed to the RX input of the
BS.
The BS processes the signal and measures the bit error rate (BER) or the block error
rate (BLER). The BLER measurements require that the data sources of the GSM sig-
nal are untruncated PN sequences. The measured error performance shall not exceed
the specified limit values, where the minimum requirements are given per channel
type.
Characteristics of the wanted and the interfering signals
The wanted signals are specified as framed GSM modulated signals with specific
channel coding and low-power level.
The interfering signal is a GMSK-modulated signal with pseudo random bit sequence
of at least 511 bits length. The interferer has one active timeslot; the signal is
synchronized to and delayed in time relative to the wanted signals. The interfering sig-
nal is high in power. It does not need to have real-time data source, as no BLER mea-
surements are specified for it.
The number of wanted signals and their distribution within the maximum BS bandwidth
depends on the BS type and class. In the following, a wide area BS equipped with a
multi-carrier receiver is assumed.
About the AM Suppression Testing

Application Example: GSM AM Suppression Test
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Within the available BS RF bandwidth, the up to 4 wanted signals are allocated sym-
metrically around the center frequency. The interfering signal is sent on the center fre-
quency. The inner two wanted signals are spaced at 6 MHz away form the interferer.
The remaining wanted signals are located at the edges of the maximum supported
bandwidth and at least at 600 Hz away form the inner two.
The frequency distribution is illustrated on Figure 4-2.
Figure 4-2: Frequency allocation of the wanted and the interfering signals
GSM frequency bands and channels
According to TS 51.021, a GSM band contains a set of adjacent channels, each with a
bandwidth of 200 kHz. The channel numbers and the assignment between channel
numbers and frequencies are band-specific.
In all frequency bands, the downlink frequencies are higher than the corresponding
uplink frequencies. The difference between downlink and uplink frequencies is termed
the duplex spacing; it is also band-specific.
For an overview the GSM bands with their channel numbers and the downlink and
uplink center frequencies, see TS 51.021.
Cabling and synchronization issues
As a rule, always use short RF cables of equal length. If a trigger signal is required,
feed the BS signal to the R&S SMW.
In test setups with more than one instrument, all instruments usually use the same ref-
erence clock. While testing BS receivers, the clock signal is provided by the DUT.
Additional reference frequency is not required.
4.3 How to Generate Signals for GSM AM Suppression
Tests
The following is an example on how to select the correct system configuration and con-
figure the instrument in general. Not all GSM-related settings configurations are shown.
The example uses predefined settings and PN sequences as data source; channel
coding is not used.
How to Generate Signals for GSM AM Suppression Tests

Application Example: GSM AM Suppression Test
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Consider to load you own data lists and to configure the GSM bursts and frames
according to the specification TS 51.021.
The example assumes the following settings:
●3x1x1 configuration with duplicated streams; generated are 6 streams, where 5 of
them are used
●The 4 wanted signals are routed to RF A; the interfering signal to RF B (dynamic
range reasons)
●The maximum RF BS Bandwidth is 24 MHz
●The absolute radio frequency channel number that needs to be tested is ARFCN
30; the BS center frequency is fDL = 941 MHz
●The frequency of the interfering signal (fi) is at least 6 MHz away form the ARFCN
under test.
The interfering signal uses the frequency fi = 947.2 MHz
●The wanted signals are arranged symmetrically around the center frequency, see
Figure 4-2
The inner two wanted signals are at ±6 MHz offset and the outer two at ±12 MHz
●GSM transmission in timeslot 1 for both, the 4 wanted and the interfering signals
●The interfering signal is a GSMK modulated PN9 sequence of 511 bits length.
●The DUT is multi-carrier BS with a multi-carrier receiver. Assumed is a simultane-
ous test of two logical channels on different carriers.
The generated wanted signals are pairwise identical. The streams of each pair are
frequency shifted so that their transmission is not on nearby carriers.
How to generate a 3x1x1 SISO signal with 6 output streams
1. Open the "System Configuration > Fading/Baseband Configuration".
Configure the following:
● Select "Mode > Advanced".
● Enable a 3x1x1 SISO scenario.
● Select "BB Sources > Separate".
● Select "Duplicate Streams > On".
● Confirm with "Apply".
2. Select "I/Q Stream Mapper".
Shifts and route the streams as follows:
● "Stream A > Frequency Offset = - 12 MHz"
● "Stream B > Frequency Offset = 6 MHz"
● "Stream C > Frequency Offset = - 6 MHz"
● "Stream D > Frequency Offset = 12 MHz"
● "RF A > Combination > Add"
● Stream A, B, C, D to RF A and Stream E to RF B
How to Generate Signals for GSM AM Suppression Tests

Application Example: GSM AM Suppression Test
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The four wanted signals are routed to the RF A; the interfering signal to RF B.
3. In the status bar, set the frequency ("Freq A" and "Freq B") to the frequency of the
interfering signal (fi).
The wanted signals are shifted and arranged in pairs symmetrically around the
interferer.
4. In the status bar, set the level values as follows:
● Level A is the sum power level of the 4 wanted signals. The required values are
listed in TS 51.021, table 7.8-1.
● Level B is the signal level of the interfering signal, as listed in TS 51.021, table
7.8-2.
In this example, the power levels of the wanted signals are -94 dBm and -98 dBm.
The interfering signal level is -31 dBm.
5. In the baseband domain, signals are leveled relative to each other. We assume,
that the -98 dBm signals are generated in "Baseband A".
To boost the signals generated in "Baseband B", select "Baseband B > Baseband
Offsets > Baseband B > Gain = 4 dB".
How to configure the GSM baseband signal
The following is a list with general steps for configuring the interfering signal. The
interfering signal is GMSK modulated PN9 sequence signal.
Configure the wanted signals in the same way. Consider the coding requirements
specified in the TS 51.021.
How to Generate Signals for GSM AM Suppression Tests

Application Example: GSM AM Suppression Test
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18User Manual 1178.3263.02 ─ 01
We assume that the wanted and the interfering signals are transmitted in timeslot 1.
1. Select "Baseband C > GSM"
2. Select "Framed (Single) Configuration".
Per default, the first timeslot 0 is active.
3. To disable timeslot 0 and activate timeslot 1:
● In the frame graph, double-click slot 0.
Select "Slot Level > Off".
● Double-click slot 1.
Select "Slot Level > Full".
How to Generate Signals for GSM AM Suppression Tests

Application Example: GSM AM Suppression Test
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19User Manual 1178.3263.02 ─ 01
The default burst type is sufficient. It uses GMSK modulation and PN9 data source.
("Common > Burst Type = Normal (GMSK / Full Rate)" and "Normal (GMSK) >
Data = PRBS 9")
4. If R&S SMW is triggered by the BS:
● Select "Trigger In > Trigger Mode > Armed Auto"
● Select "Source > External Global Trigger".
5. Interferer is delayed in time between 61 and 86 symbols.
To delay the interfering signal, select for example "Trigger Delay = 70 Symbols".
6. Configure the wanted signals in baseband A and B.
Load you own data lists as data source.
Configure the GSM bursts and frames according to the specification TS 51.021.
Consider the required channel coding.
7. In all baseband blocks, select "GSM > State > On".
Both I/Q modulators are activated automatically.
For more information on the available GSM/EDGE settings:
See user manual R&S®SMW-K40/-K41 GSM/EDGE, EDGE Evolution.
To activate the signal generation
1. If the BS reference frequency is fed to the R&S SMW, in the status bar select "Int
Ref > Reference Frequency > External".
How to Generate Signals for GSM AM Suppression Tests

Application Example: GSM AM Suppression Test
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2. In the block diagram, activate the RF outputs.
The display resembles the one on the following figure. The additional information
on Figure 4-3 illustrates the routing and the frequency allocation of the wanted and
the interfering signals.
Note that the streams generated form the same baseband are not transmitted on
nearby carriers.
Figure 4-3: Block diagram: understanding the displayed information
1 = Interferer frequency
2 = Sum power level of the 4 wanted signals, interfering signal power level
3 = Streams A, B, C and D (i.e. the 4 wanted signals) are routed to output RF A
4 = Stream E (i.e. the interferer) is output at the RF B
How to Generate Signals for GSM AM Suppression Tests