Tektronix RSA3408A User Manual
User Manual
RSA3408A Option 28
TD-SCDMA Analysis Software
071-1683-00
This document applies to firmware version 1.0
and above.
www.tektronix.com
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Table of Contents
Getting Started
Operating Basics
Product Description 1--1..............................................
Functional Overview 2--1.......................................
Accessing a Measurement Function 2--2..................................
Versatile Display Capability 2--2........................................
TD-SCDMA Measurements 2--5.................................
Subframe Summary 2--6..............................................
Modulation Accuracy Measurement 2--9.................................
Code Domain Power Measurement 2--23..................................
Channel Power Measurement 2--33.......................................
OBW Measurement 2--36..............................................
ACLR Measurement 2--39..............................................
Spectrum Emission Mask Measurement 2--43..............................
Timeslot Summary 2--47...............................................
Transmit On/Off Mask 2--51............................................
Symbol Table Display 2--55............................................
Intermodulation Measurement 2--58......................................
Timing Parameters for Demodulation Measurements 2--61....................
Measurement Parameters for Demodulation Measurements 2--62...............
Editing the Measurement Limits 2--65.............................
Using the Measurement Limits Editor 2--65................................
Saving and Loading Measurement Limits 2--71.............................
Measurement Limit Defaults 2--72.......................................
Appendices
Appendix A: Setting Range A-- 1.................................
Index
RSA3408A Option 28 User Manual
i
Table of Contents
List of Figures
Figure 2--1: Menu diagram showing measurement functions
available in Option 28 2--1...................................
Figure 2--2: Measurements of same domain interact 2--3.............
Figure 2--3: In strument capable of displaying multiple domains 2--4...
Figure 2--4: Subframe summary 2--6..............................
Figure 2--5: Modulation accuracy measurement 2--9................
Figure 2--6: Comp. constellation display 2--12.......................
Figure 2--7: Symbol constellation display 2--14......................
Figure 2--8: Symbol EVM display 2--16............................
Figure 2--9: MagErr display 2--18.................................
Figure 2--10: PhaseErr display 2--20...............................
Figure 2--11: Code domain power measurement 2--23.................
Figure 2--12: Code domain power display 2--26......................
Figure 2--13: CDP by subframe display 2--28........................
Figure 2--14: CDP by symbol display 2--29..........................
Figure 2--15: CDP codogram display 2--31..........................
Figure 2--16: Channel power measurement 2--33.....................
Figure 2--17: OBW measurement 2--36.............................
Figure 2--18: ACLR measurement 2--39............................
Figure 2--19: Spectrum emission mask (offset from channel)
measurement 2--43..........................................
Figure 2-- 20: Spectrum emission mask (inband spurious)
measurement 2--44..........................................
Figure 2--21: Timeslot summary 2--47..............................
Figure 2--22: Timeslot summary, display zoomed 2--50................
Figure 2--23: Transmit on/off mask 2--51...........................
Figure 2--24: Zoom to Max Mid-Ramp Power selected 2--54...........
Figure 2--25: Symbol table display 2--55............................
Figure 2--26: Intermodulation measurement 2--58....................
Figure 2--27: Measurement limits editor 2--66.......................
Figure 2--28: Spectrum emission mask measurement limits editor 2--69.
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RSA3408A Option 28 User Manual
List of Tables
Table of Contents
Table 2--1: Global demodulation timing parameter settings 2--61......
Table 2--2: Global demodulation measurement parameter settings 2--62
Table 2--3: Measurement limits items 2--66.........................
Table 2--4: Measurement limit items for the spectrum emission
mask measurements 2--69....................................
Table 2--5: Downlink main table default limits 2--72.................
Table 2--6: Uplink main table default limits 2--72....................
Table 2--7: Downlink SEM offset from channel default limits 2--73.....
Table 2--8: Uplink S EM offset from channel default limits 2--73.......
Table 2--9: Downlink SEM inband spurious default limits 2-- 74.......
Table 2--10: Uplink SEM inband spurious default limits 2--74.........
Table A--1: Display format and scale A--1.........................
RSA3408A Option 28 User Manual
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Table of Contents
iv
RSA3408A Option 28 User Manual
Preface
About This Manual
This manual provides operating instructions for the RSA3408A Real-Time
Spectrum Analyzer Option 28 TD-SCDMA (Time Division Synchronous Code
Division Multiple Access) analysis software.
Option 28 supports TD-SCDMA as described in the 3GPP Release 4 LCR
Uplink/Downlink (3GPP TS25.142, TS25.102) standard.
This manual is composed of the following chapters:
H Getting Started provides a product description.
H Operating Basics describes the measurement functions added by the option
and explains how to set up the analyzer for each measurement mode.
H Appendices provides additional information about default settings.
The analyzer uses Microsoft Windows XP as the operating system. This manual
does not describe common usage of Windows XP. Refer to your Windows
manuals as necessary.
Related Manuals
PDF Manual
The following related documents are also available:
H RSA3408A User Manual
(Standard accessory; Tektronix part number 071--1617--XX)
Describes how to install the analyzer and how to work with the menus, and
details the standard functions. Also shows the specifications.
H RSA3408A Programmer Manual
(Standard accessory; PDF, Tektronix part number 077--0003--XX)
Contains an alphabetical listing of the programming commands and other
information related to controlling the analyzer over the GPIB interface.
The programmer manual described above is a PDF document (the file size is
about 5 MB). The file is stored in this directory on the analyzer hard disk:
C:\Program Files\Tektronix\wca200a\Manuals
Use the USB or LAN interface to copy the file onto your PC. Refer to the
RSA3408A User Manual for using the interface.
RSA3408A Option 28 User Manual
v
Preface
Contacting Tektronix
Phone 1-800-833-9200*
Address Tektronix, Inc.
Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
Web site www.tektronix.com
Sales support 1-800-833-9200, select option 1*
Service support 1-800-833-9200, select option 2*
Technical support www.tektronix.com/support
1-800-833-9200, select option 3*
6:00 a.m. -- 5:00 p.m. Pacific Standard Time
* This phone number is toll free in North America. After office hours, please leave a voice mail
message.
Outside North America, contact a Tektronix sales office or distributor; see the Tektronix web
site for a list of offices.
vi
RSA3408A Option 28 User Manual
Getting Started
Getting Started
Product Description
This chapter provides an overview of the capabilities added to the RSA3408A
with Option 28.
The TD-SCDMA standard contains elements of frequency division, time
division, and code division multiple access technologies. Combining these
technologies allows the reuse of frequency channels for uplink and downlink
communication. A single frequency channel is shared between uplink and
downlink, and among users. The use of a single channel is accomplished by
allocating timeslots to each transmit direction and to each user.
The RSA3408A Real-Time Spectrum Analyzer Option 28 is an analysis software
option that adds transmitter measurement capability for TD-SCDMA uplink and
downlink (3GPP TDD LCR) to the analyzer.
You can perform the following TD-SCDMA measurements:
H Demodulation measurements
H Subframe summary
H Modulation accuracy
H Code domain power
H Timeslot summary
H Transmit on/off mask
H Symbol table
H RF measurements
H Channel power
H OBW (occupied bandwidth)
H ACLR (adjacent channel leakage ratio)
H Spectrum emission mask
H Intermodulation
In addition, the option provides user-defined measurement limits for many
measurement results. Using these measurement limits, you can easily check that
the input signal meets the specification.
RSA3408A Option 28 User Manual
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Getting Started
1- 2
RSA3408A Option 28 User Manual
Operating Basics
Functional Overview
This chapter provides an overview of the Option 28 measurement functions.
Figure 2--1 shows the measurement functions and how to access each measurement function from the front-panel menu key.
Other option name
(if installed)
MODE
S/A
DEMOD
TIME
DEMOD
menu
Analog Demod
Digital Demod
Standard...
Standard
menu
TD-SCDMA
Figure 2- 1: Menu diagram showing measurement functions available in Option 28
MEASURE
menu
Measurement functions
added by Option 28
Subframe Summary
Modulation Accuracy
Code Domain Power
Channel Power
OBW
ACLR
Spectrum Emission Mask
Timeslot Summary
Transmit On/Off Mask
Symbol Table
Intermodulation
RSA3408A Option 28 User Manual
2- 1
Functional Overview
Accessing a Measurement Function
All of the measurement functions available in Option 28 can be selected from the
DEMOD (demodulation) mode.
Perform the following procedure to access any of the measurement functions:
1. Press the DEMOD menu key to open the DEMOD menu.
2. Press the Standard... side key to open the Standard menu.
3. Press the TD-SCDMA side key to select the TD-SCDMA standard and open
the MEASURE menu for the standard.
4. Press a side key to select the measurement that you want to perform. If the
desired measurement i s not displayed on the current MEASURE menu, press
the Go to page side key to go to the next MEASURE menu page.
5. If needed, set the frequency, span, and amplitude of the input signal. Refer to
the RSA3408A Real-Time Spectrum Analyzers User Manual for information
on how to set frequency, span, and amplitude.
NOTE. Most TD-SCDMA measurements are optimized for a 2 MHz or 5 MHz
span.
Versatile Display Capability
The display of the RSA3408A analyzer with Option 28 provide you with a
versatile tool for viewing different aspects of a measurement domain or viewing
two different measurement domains.
When two measurements of the same domain are displayed in the subview and
mainview (such as two views from the modulation accuracy domain), the
measurement markers are linked together.
Placing a measurement view of one domain in t he subview and a measurement
display of another domain in the mainview gives you the ability to monitor both
at the same time.
2- 2
RSA3408A Option 28 User Manual
Functional Overview
Measurements within
same domain interact.
Moving the marker in the
subview moves the marker in
the other two views.
Figure 2- 2: Measurements of same domain interact
RSA3408A Option 28 User Manual
2- 3
Functional Overview
Measurement from code
domain displayed in
subview
Measurement from
modulation accuracy
domain displayed in
mainview
Figure 2- 3: Instrument capable of displaying multiple domains
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RSA3408A Option 28 User Manual
TD-SCDMA Measurements
This section describes the functions and features of the TD-SCDMA measurements. Each measurement description contains general information about the
measurement, descriptions of the measurement displays, and functions available
through menu selections.
The information is divided into the following subsections:
H Subframe summary
H Modulation accuracy
H Code domain power
H Channel power
H OBW (occupied bandwidth)
H ACLR (adjacent channel leakage ratio)
H Spectrum emission mask (SEM)
H Timeslot summary
H Transmit on/off mask
H Symbol table
H Intermodulation
NOTE. If you are not familiar with the operation of the RSA3408A, refer to the
RSA3408A Real-Time Spectrum Analyzer User Manual before reading this
section.
RSA3408A Option 28 User Manual
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TD-SCDMA Measurements
Subframe Summary
The subframe summary measurement displays a power versus time graph of the
selected subframe, along with all general parameters discovered while analyzing
the subframe. The subframe summary waveform is available whenever subframe
timing can be determined using either DwPts or an external subframe trigger as a
time reference. Figure 2--4 shows an example of the subframe summary.
The measured values for subframe are described the section Subframe Measure-
ment Readouts beginning on page 2--8.
Green bar
represents the
analysis area
Current
timeslot and
link direction
Subframe numerical
readout
NOTE: The subframe marker is linked to overview window. Turn on the overview
marker to see position of the subframe within overall acquisition.
Figure 2- 4: Subframe summary
Display Elements
Marker readout
corresponds to the
marker position
Marker
Blue area represents
the selected timeslot
The following information is shown in t he subframe summary measurement
display:
2- 6
H Overview: The overview display area can contain the power versus time or
spectrogram measurement displays.
RSA3408A Option 28 User Manual
TD-SCDMA Measurements
H Subview: The subview display area can contain any of the TD-SCDMA
demodulation measurements or the spectrum display.
H Mainview: The mainview display area displays only the power versus time
graph.
To change the contents in each of the views, use the VIEW DEFINE menu. Refer
to Changing the View Contents on page 2--7 for more information.
Setting the Timing
Parameters
Setting the Measurement
Parameters
You can set timing parameters for the subframe summary acquisition by using
the TIMING menu. Press the TIMING key to open the menu. Refer to Timing
Parameters for Demodulation Measurements, beginning on page 2--61, for a
description of the timing parameter settings.
NOTE. The timing parameters for demodulation measurements are global
settings for all TD-SCDMA demodulation measurements.
You can set the measurement parameters for the subframe summary measurements by using the MEAS SETUP menu. Press the MEAS SETUP key to open
the menu. Refer to Measurement Parameters for Demodulation Measurements,
beginning on page 2--62, for a description of the measurement parameters.
NOTE. The measurement parameters for demodulation measurements are global
settings for all TD-SCDMA demodulation measurements. Most of the modulation
parameters and analysis control settings do not take effect until the next run or
analysis cycle.
Changing the View
Contents
RSA3408A Option 28 User Manual
You can change the view contents in the overview and subview using the VIEW
DEFINE menu. Press the VIEW DEFINE key to open the menu.
H Show Views: Selects the view style on the screen. You can select Single or
H Overview Content...: The overview content display can be changed to
H Subview Content...: The subview content display can be changed to display
Multi. Multi shows all three views and Single expands the display to only
show the view currently selected. Press the SELECT key to change the
selected view.
display either the Spectrogram or Waveform (power versus time).
any of the TD-SCDMA demodulation measurements or the spectrum
display.
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TD-SCDMA Measurements
H Mainview Content...: The mainview content display can not be changed
from Subframe summary.
H Menu Off: Hides the side menu. To display the menu again, press t he
MENU side key or VIEW DEFINE key.
Scale and Format in the
Mainview
You can set the scale for the display using the VIEW SCALE menu. Press the
VIEW SCALE key to open the menu.
H Auto Scale (Amplitude): Sets the start value and the scale of the vertical
axis to display the entire waveform.
H Horizontal Scale (s): Sets the scale of the horizontal axis (number of chips
or symbols).
H Horizontal Start (s): Sets the chip number or symbol number of the first
(left) value of the horizontal axis.
H Vertical Scale (dB): Sets the scale of the vertical axis.
H Vertical Stop (dBm): Sets the maximum (top) value of the vertical axis.
H Full Scale: Sets all scale values to their default full-scale value.
H Step Size (Horizontal Start / Vertical Stop): Sets the step size (amount per
click of the general purpose knob) for changes to the Horizontal Start or
Vertical Stop settings.
The step size menu choices only display when selecting the Horizontal Start
or Vertical Stop menus.
Subframe Measurement
Readouts
2- 8
This section describes the measurement readouts displayed in the mainview of
the subframe measurement.
Readout Description
Downlink Pilot (Sync-DL) The code number of the downlink pilot pattern.
Uplink Pilot (Sync-UL) The code number of the uplink pilot pattern.
Scrambling Code The scrambling code.
Switching Point The timeslot switching point.
DwPts Pattern The rotation pattern (None, S1, S2) of the downlink pilot.
Multiframe Position The subframe position (1 to 4) within a multiframe.
DwPts RMS power The RMS power of the downlink pilot.
UpPts RMS power The RMS power of the uplink pilot.
GP RMS power The RMS power in the subframe guard period.
RSA3408A Option 28 User Manual
Modulation Accuracy Measurement
The modulation accuracy measurement measures EVM (Error Vector Magnitude), Rho, magnitude error, phase error, frequency error, I/Q imbalance, and I/Q
offset. Figure 2--5 shows an example of the modulation accuracy measurement.
TD-SCDMA Measurements
Figure 2- 5: Modulation accuracy measurement
Display Elements
The following elements are shown in the modulation accuracy measurement
display:
H Overview: The overview display area can contain the power versus time or
H Subview: The subview display area can contain any of the TD-SCDMA
H Mainview: The mainview display area can contain one of the modulation
RSA3408A Option 28 User Manual
Condensed measurement
results displayed when
mainview is not selected
spectrogram measurement displays.
demodulation measurements or the spectrum display. Measurement results
typically associated with a measurement are not displayed when the
measurement is displayed in the subview.
accuracy related measurements along with a condensed set of numerical
2- 9
TD-SCDMA Measurements
measurement results with a Pass or Fail message (determined by the Limits
settings) for each measurement result. If all measurements pass, PASS is
displayed at the top of the screen. If any measurement fails, FAIL is
displayed at the top of the screen.
To change the contents in each of the views, use the VIEW DEFINE menu. Refer
to Changing the View Contents on page 2--10 for more information.
Setting the Timing
Parameters
Setting the Measurement
Parameters
You can set timing parameters for the modulation accuracy acquisition by using
the TIMING menu. Press the TIMING key to open the menu. Refer to Timing
Parameters for Demodulation Measurements, beginning on page 2--61, for a
description of the timing parameter settings.
NOTE. The timing parameters for demodulation measurements are global
settings for all TD-SCDMA demodulation measurements.
You can set the measurement parameters for the modulation accuracy measurements by using the MEAS SETUP menu. Press the MEAS SETUP key to open
the menu. Refer to Measurement Parameters for Demodulation Measurements,
beginning on page 2--62, for a description of the measurement parameters.
NOTE. The measurement parameters for demodulation measurements are global
settings for all TD-SCDMA demodulation measurements. Most of the modulation
parameters and analysis control settings do not take effect until the next run or
analysis cycle.
2- 10
Changing the View
Contents
You can change the view contents in the overview, subview, and mainview using
the VIEW DEFINE menu. Press the VIEW DEFINE key to open the menu.
H Show Views: Selects the view style on the screen. You can select Single or
Multi. Multi shows all three views and Single expands the display to only
show the view currently selected. Press the VIEW SELECT key to change
the selected view.
H Overview Content...: The overview content display can be changed to
display either the Spectrogram or Waveform (power versus time).
H Subview Content...: The subview content display can be changed to display
any of the TD-SCDMA demodulation measurements or the spectrum
display.
RSA3408A Option 28 User Manual
TD-SCDMA Measurements
H Mainview Content...: The mainview content display can be changed to
display one of the modulation accuracy related measurements with its
numerical measurement results. You can select Composite Constellation,
Symbol Constellation, Symbol Error Vector Magnitude, Magnitude Error, or
Phase Error.
When selecting the mainview , the expanded numerical measurement results
are displayed. (The overview content display is removed.)
A Pass or Fail message for each measurement is displayed if limit testing is
turned on in the Limits menu. If all measurements pass, PASS is displayed at
the top of the screen. If any measurement fails, FAIL is displayed at the top
of the screen.
Refer to Scale and Format in the Mainview, beginning on page 2--12, for
more information about the mainview content selections.
H Menu Off: Hides the side menu. To display the menu again, press t he
MENU side key or VIEW DEFINE key.
RSA3408A Option 28 User Manual
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TD-SCDMA Measurements
Scale and Format in the
Mainview
This section describes the scale settings and display format in the mainview.
Comp. Constellation Display. When you select Mainview Content from the VIEW
DEFINE menu and then select Comp. Constellation from the Mainview Content
submenu, an IQ rectangular graph is displayed showing the I/Q values for all
chips in the current timeslot, including midamble. See Figure 2--6.
The measured values for modulation accuracy are described the section
Modulation Accuracy Measurement Readouts beginning on page 2--21.
Expanded measurement
results displayed when
mainview is selected
Figure 2- 6: Comp. constellation display
Chip number
I/Q values
I/Q rectangular graph
(vector display)
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RSA3408A Option 28 User Manual
TD-SCDMA Measurements
You can set the scale of the display using the VIEW SCALE menu. Press the
VIEW SCALE key to open the menu.
H Measurement Content...: Selects vector or constellation display.
Vector: Selects vector display. A signal represented with phase and
amplitude is displayed in rectangular (I and Q) coordinates. Each red point
indicates a symbol position on the measured signal and the yellow trace
indicates the locus of the signal between symbols.
Constellation: Selects constellation display. It is the same as the vector
display, except that only symbols of the measured signal are indicated in red,
and the locus between symbols is not shown.
NOTE. I and Q signals are normalized to prevent the scale from changing when
signal attenuation changes.
RSA3408A Option 28 User Manual
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TD-SCDMA Measurements
Symbol Constellation Display. When you select Mainview Content from the
VIEW DEFINE menu and then select Symbol Constellation from the Mainview
Content submenu, an IQ rectangular graph is displayed showing the constellation
for Data1 and Data2 symbols selected by the currently selected code (set in the
Meas Setup menu). See Figure 2--7.
The measured values for modulation accuracy are described the section
Modulation Accuracy Measurement Readouts beginning on page 2--21.
Expanded measurement
results displayed when
mainview is selected
Figure 2- 7: Symbol constellation display
You can set the scale of the display using the VIEW SCALE menu. Press the
VIEW SCALE key to open the menu.
Symbol number
Selected code
OVSF code
Spreading factor
Modulation type
Vertical scale
Vertical start
Horizontal scale
Horizontal start
2- 14
RSA3408A Option 28 User Manual
TD-SCDMA Measurements
H Measurement Content...: Selects vector or constellation display.
Vector: Selects vector display. A signal represented with phase and
amplitude is displayed in rectangular (I and Q) coordinates. Each red point
indicates a symbol position on the measured signal and the yellow trace
indicates the locus of the signal between symbols.
Constellation: Selects constellation display. It is the same as the vector
display, except that only symbols of the measured signal are indicated in red,
and the locus between symbols is not shown. The cross marks indicate
symbol positions of an ideal signal.
NOTE. I and Q signals are normalized to prevent the scale from changing when
signal attenuation changes.
RSA3408A Option 28 User Manual
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