Tektronix OFDM Waveform User manual
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OFDM
ZZZ
Plug-in Application
Printable Help
*P077134800*
077-1348-00
OFDM
Plug-in Application
ZZZ
Printable Help
w.tek.com
ww
077-1348-00
Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its
subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this
publication supersedes that in all previously published m aterial. Specifications and price change privileges
reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
®
SourceXpress
is a registered trademark of Tektronix, Inc.
Microsoft, Windows, Windows XP Professional, and Windows 7 are registered trademarks of Microsoft
Corporation.
Supports OFDM Plug-in application Version 2.0 and above.
Help part number: 076–0409–00
PDF of Help system part number: 077–1348–00
Contacting Tektronix
Tektronix, Inc.
14150 SW Karl Braun Drive
ox 500
P. O . B
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
In North America, call 1-800-833-9200.
ldwide, visit www.tek.com
Wor
to find contacts in your area.
Table of Contents
Introduction
Welcome............................................................................................................. 1
Key features ......................................................................................................... 1
Documentation......................................... ................................ ............................. 2
Support information....... .................................. ................................ ....................... 2
Orientation
Elements of the display ............................................................................................ 3
Signal format selection............................................................................................. 3
Plug-in selection ....................................... ................................ ............................. 4
Compile button..................... ................................ ................................ ................. 4
Compile settings .................................................................................................... 5
Reset Plug-in button....... ................................ ................................ ......................... 8
Presets button ....................................................................................................... 8
Help button............... .................................. ................................ ......................... 8
Table of Contents
Basic setup
Basic setup .......................................................................................................... 9
Frames tab
Frame settings...................................... ................................ ................................ 11
Preamble tab
Preamble tab................................................................................................... 12
Header tab
Header tab ... .................................. ................................ ................................ 13
Payload tab
Payload tab .......................... .................................. ................................ ........ 13
Multipath tab
Multipath tab . . ................ .. . . . . . . . . . . . . . . . . . . . . . . . . ................ . . . . . . . . . . . . . . . . . . . . . . . . .............. 14
Gated Noise tab
Gated Noise tab ................... ................................ .................................. .......... 15
Hopping tab
Hopping tab ................................................................................................... 16
hase Noise tab
P
Phase Noise tab ..................... ................................ .................................. ........ 17
Symbols tab
Symbols tab .. .................................. ................................ ................................ .... 21
OFDM Plug-in Application Printable Help i
Table of Contents
Subcarriers for symbols
Subcarriers for symbols ...................................................................................... 22
Defining the Pa
PRBS Editor ............................... ................................ .................................. .. 25
Modulation types available .................................................................................. 25
Defining subcarrier positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................... 26
Amplitude Phase Profile
Amplitude Phase Profile ..................................................................................... 27
S-Parameter tab
S-Parameter license ............................................................................................... 29
S-Parameter ........................................................................................................ 29
S-Parameter file descriptions .................. ................................ .............................. 33
Aggressor signals ............................................................................................. 35
Licensing
Licensing ........................................................................................................... 37
ttern .......................................................................................... 24
Index
ii OFDM Plug-in Application Printable Help
Introduction Welcom e
Welcome
The Orthogonal Frequency Division Multiplexing (OFDM) plug-in is a waveform creation application
used to create a number of closely spaced modulated carriers. With this application, you can custom build
OFDM frames b
The OFDM plug-in is designed to integrate and operate seamlessly as an enhancement to the SourceXpress
waveform creation software application or to an AWG70000 series arbitrary waveform generator.
Once installed, the plug-in becomes available as another waveform plug-in application.
This illustration shows the OFDM plug-in viewed from the SourceXpress application. The plug-in is
identical whether it is used from SourceXpress or from an AWG instrument supporting the plug-in
application.
ydefining symbols and the parameters within symbols.
Key features
Configure all parameters of OFDM
Custom build OFDM frames right from defining the base data, symbols, and frames
Add Impairments, Phase Noise, and Multi-path
Define frequency hopping and gated noise
Support for a variety of sub-carrier modulation (BPSK, QPSK, 8-PSK, and QAM (8, 16, 32, 64,
128, 256, 512, 1024)
OFDM Plug-in Application Printable Help 1
Introduction Documentation
Documentation
In addition to this application Help system, the following documentation is available for the software.
All documentation is available on the Tektronix Web site (www.tek.com/manual/downloads
To read about Use these documents
OFDM plug-in operation and user interface help Access the plug-in application help from the plug-in Help menu for
information on all controls and elements on screen.
The OFDM plug-in help system is also available in PDF format located in
the program’s installation folder and also available on the Tektronix web
site.
OFDM plug-in programmer commands Access the plug-in programmer manual for the syntax of remote commands
specific to the plug-in.
This is available on the Tektronix web site.
SourceXpress operation and user interface help Access the SourceXpress application help from the Help menu for
information on all controls and elements on screen.
The SourceXpress help system is also available in PDF format, available
on the Tektronix web site.
SourceXpress programmer commands Access the SourceXpress programmer manual for the syntax of remote
commands.
This document is available in PDF format located in the program’s
installation folder and also available on the Tektronix web site.
Connected instrument operation and user
interface help (such as an AWG70002A)
For operation and interface help of a connected instrument, refer to the
instrument’s documentation.
This is available with the instrument or on the Tektronix web site.
).
Connected instrument programmer commands
(such as an AWG70002A)
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Support information
Tektronix offers the following services in support of their products:
Technical Support. For application-related questions about a Tektronix product, contact us by
telephone or email ).
Service Support. For service-related questions about a Tektronix product, contact us by telephone
or email ).
Tektronix also offers extended warranty and calibration programs as options on many products. Contact
your local Tektronix distributor or sales office.
For programming information of a connected instrument, refer to the
instrument’s documentation. This is available with the instrument or on
the Tektronix web site.
2 OFDM Plug-in Application Printable Help
Orientation Elements of the display
Elements of the display
The main areas of the application window are shown in the following figure.
Signal format selection
The Signal Format selection lets you choose the carrier type, either for RF signals (RF/IF) or baseband
signals (IQ).
See the Basic setup
OFDM Plug-in Application Printable Help 3
(see page 9) section for additional details.
Orientation Plug-in selection
Plug-in selection
Use the Plug-in pull-down menu to select the OFDM signal modulation plug-in application. The plug-in
pull-down menu varies depending on the installed applications.
NOTE. The OFD
Refer to Licensing
Compile button
Use the Compile button to create the waveforms and place the waveforms into the Waveforms list
of the host generator.
Use the Compile settings
M signal modulation plug-in requires a license to create waveforms.
(see page 37).
(see page 5) button to edit the compilation settings.
4 OFDM Plug-in Application Printable Help
Orientation Compile settings
Compile settings
Item Description
Name
rwrite existing
Ove
waveform/sequence
The application provides a base name for compiled waveforms. You can edit the field
a name of your choice. The waveform is added to the Waveforms list. If the name
with
already exists, the name is incremented with a numerical value (unless the overwrite
option is selected).
Reset Plug-in button resets the Name field to the default name.
The
hecked, a waveform/sequence with the same name (in the waveforms or sequence list)
If c
is overwritten with no warnings.
OFDM Plug-in Application Printable Help 5
Orientation Compile settings
Item Description
Compile for Choose the channel to associate with the compiled waveform. The selected channel is
also used to de
The available channels is dependent on the generator model.
For R F waveforms, select a single channel to associate w ith the RF waveform.
For I and Q wav
Compile only The compiled
Compile and
assign
The compile
to a selected channel.
Play after assign If checked, the waveform starts to play out immediately after compiling.
The instrument’s sample rate and amplitude will change based on the compiled waveform’s
propertie
Create se
Sampling
quence
Rate
Auto Cal
culate
If checke
This is t
rate based on the settings chosen for the waveform.
Manual
Select to enter a specific sampling rate.
Oversampling Select to increase the apparent sampling rate.
The Sampling Rate is calculated by multiplying Oversampling with the maximum frequency
signal to be generated.
of the
Corrections File
Apply
n apply a correction file directly to the waveform w hen compiling.
You c a
When compiling an RF waveform, you apply a single correction file to the RF waveform.
When compiling I and Q waveforms, you can apply individual correction files to both
and Q components.
the I
rections file
Cor
n applying a correction file, navigate to the location of the file.
Whe
fine the amplitude ranges.
eforms, select a channel to associate with the I and Q components.
waveforms are simply entered into the Waveforms list.
d waveforms are entered into the Waveforms list and automatically assigned
s.
d, a sequence with waveforms will be created after compilation.
he default method to set the sampling rate. The application creates a sampling
Co
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mpile
Use the browse folder icon
Onceavalidfile path is entered, the Correction Settings icon
splay the Frequency Response screen
di
mpiles the waveform.
Co
to navigate to a saved correction file.
is enabled. Select to
(see page 6) (shown below).
Correction file frequency response
If applying an RF correction file, the Frequency Response screen shows plot information and provides
Advanced options to apply a Gaussian filter and remove Sin(x)/x distortions.
6 OFDM Plug-in Application Printable Help
Orientation Compile settings
If applying an I/Q correction file (to a pair of I and Q waveforms), the Frequency Response screen shows
plot information and provides Advanced options to apply a skew.
OFDM Plug-in Application Printable Help 7
Orientation Reset Plug-in button
Reset Plug-in button
Returns all plug-in settings to their default values.
Presets button
The Presets button provides access to the following menu of preset files that you can use to create WiFi
and WiMax signals according to standards. To use a prese t, select the desired standard and then click the
Compile button.
For WiMedia standards, please refer to the MultiBand OFDM Physica l Layer Specification Version 1.2
by WiMedia Alliance.
Item Standard
WiFi
WiMax 802.16 2004 Downlink 5 MHz
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802.11a 36 M bit/s QAM16
802.16 2004 Downlink 10 MHz
802.16 2004 Downlink 20 MHz
Help button
The Help button provides links to additional product help and documentation.
Item Description
User manual
About ...
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Opens the plug-in help system.
Provides you with information about your plug-in application. This information is
helpful when contacting Tektronix about your application.
8 OFDM Plug-in Application Printable Help
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