Tektronix RSA3408A User Manual

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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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TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Software WARRANTY

Tektronix warrants that the me dia on which this software product is furnished and the encoding of the programs on the media will be free from defects in materials and workmanship for a period of three (3) months from the date of shipment. If a medium or encoding proves defective during the warranty period, Tektronix will provide a replacement in exchange for the defective medium. Except as to the media on which this software product is furnished, this software product is provided “as is” without warranty of any kind, either express or implied. Tektronix does not warrant that the functions contained in this software product will meet Customer’s requirements or that the operation of the programs will be uninterrupted or error-free.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period. If Tektronix is unable to provide a replacement that is free from defects in materials and workmanship within a reasonable time thereafter, Customer may terminate the license for this software product and return this software product and any associated materials for credit or refund.

THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPLACE DEFECTIVE MEDIA OR REFUND CUSTOMER’S PAYMENT IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

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

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.

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

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

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.

RSA3408A Option 28 User Manual

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

1- 1

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.

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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

2- 4

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.

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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

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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.

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)

2- 12

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.

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TD-SCDMA Measurements

Symbol EVM Display. When you select Mainview Content from the VIEW DEFINE menu and then select Symbol EVM from the Mainview Content submenu, changes of Symbol EVM (Error Vector Magnitude) over time are displayed for each symbol (calculated on a single code channel). See Figure 2--8.

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- 8: Symbol EVM display

Symbol number EVM value Selected code OVSF code Spreading factor Modulation type

Vertical scale

Vertical start

Horizontal scale

Horizontal start

You can set the scale of the display using the VIEW SCALE menu. Press the VIEW SCALE key to open the menu.

2- 16

H Auto Scale (Amplitude): Sets the start value and the scale of the vertical

axis to display the entire waveform.

H Horizontal Scale: Sets the scale of the horizontal axis (number of symbols).

RSA3408A Option 28 User Manual

TD-SCDMA Measurements

H Horizontal Start: Sets the symbol number of the first (left) value of the

horizontal axis.

H Vertical Scale (%): Sets the scale of the vertical axis.

H Vertical Start (%): Sets the minimum (bottom) value of the vertical axis.

H Full Scale (default scaling): Sets all scale values to their default full-scale

value.

H Step Size (Horizontal Start / Vertical Start): Sets the step size of the up

and down keys when changing the Horizontal Start or Vertical Stop settings.

A step size menu only displays if the Horizontal Start or Vertical Start menu is selected.

RSA3408A Option 28 User Manual

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TD-SCDMA Measurements

MagErr Display. When you select Mainview Content from the VIEW DEFINE menu and then select MagErr from the Mainview Content submenu, changes of magnitude error over time for a single code channel are displayed for each symbol. See Figure 2--9.

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- 9: MagErr display

Symbol number Error value Selected code OVSF code Spreading factor Modulation type

Vertical scale

Vertical start

Horizontal scale

Horizontal start

You can set the scale of the display using the VIEW SCALE menu. Press the VIEW SCALE key to open the menu.

H Auto Scale: Sets the start value and the scale of the vertical axis automati-

cally to display the entire waveform.

2- 18

H Horizontal Scale: Sets the scale of the horizontal axis (number of symbols).

RSA3408A Option 28 User Manual

TD-SCDMA Measurements

H Horizontal Start: Sets the symbol number of the first (left) value of the

horizontal axis.

H Vertical Scale (%): Sets the scale of the vertical axis.

H Vertical Start (%): Sets the start value of the vertical axis. You can set the

value from --200% to 200%.

H Full Scale (default scaling): Sets all scale values to their default full-scale

value.

H Step Size (Horizontal Start / Vertical Offset): Sets the step size of the up

and down keys when changing the Horizontal St art or Vertical Offset settings.

A step size menu only displays if the Horizontal Start or Vertical Offset menu is selected.

RSA3408A Option 28 User Manual

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TD-SCDMA Measurements

PhaseErr Display. When you select Mainview Content from the VIEW DEFINE menu and then select PhaseErr from the Mainview Content submenu, changes of phase error over time for a single code channel are displayed for each symbol. See Figure 2--10.

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- 10: PhaseErr display

Symbol number Error value Selected code OVSF code Spreading factor Modulation type

Vertical scale

Vertical start

Horizontal scale

Horizontal start

You can set the scale of the display using the VIEW SCALE menu. Press the VIEW SCALE key to open the menu.

H Auto Scale: Sets the start value and the scale of the vertical axis automati-

cally to display the entire waveform.

2- 20

H Horizontal Scale: Sets the scale of the horizontal axis (number of symbols).

RSA3408A Option 28 User Manual

TD-SCDMA Measurements

H Horizontal Start: Sets the symbol number of the first (left) value of the

horizontal axis.

H Vertical Scale: Sets the scale of the vertical axis.

H Vertical Offset: Sets the offset value of the vertical axis. You can set the

value from --450 to 450 degrees.

H Full Scale: Sets all scale values to their default full-scale value.

H Step Size (Horizontal Start / Vertical Offset): Sets the step size of the up

and down keys when changing the Horizontal St art or Vertical Offset settings.

A step size menu only displays if the Horizontal Start or Vertical Offset menu is selected.

Modulation Accuracy

Measurement Readouts

This section describes the measurement readouts displayed in the mainview of the modulation accuracy measurements. The numerical measurement results reported are identical for each of the modulation accuracy measurement displays.

Readout Description

Midamble EVM (rms): The RMS error vector magnitude calculated over the midamble

of the signal. The result is optimized for the midamble and expressed as a percentage. EVM measures the noise in the input signal relative to a reference signal.

Midamble EVM (peak): The maximum value of the instantaneous error vector magnitude

calculated over the midamble of the signal and expressed as a percentage.

Comp. EVM (rms): The RMS error vector magnitude calculated on the composite

signal over the entire timeslot (both data bursts and the midamble) and expressed as a percentage.

Comp. EVM (peak): The maximum value of the instantaneous error vector magnitude

calculated on the composite signal over the entire timeslot (both data bursts and the midamble) and expressed as a percentage.

Rho: A measure of the desired part of the signal relative to a

reference signal.

Comp. Mag Error (rms): The RMS error of the composite signal due to magnitude errors

in the signal.

Comp. Mag Error (peak): The maximum value of the instantaneous magnitude error of the

composite signal.

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TD-SCDMA Measurements

Readout Description

Comp. Phase Error (rms): The RMS phase error of the composite signal.

This measurement is most useful with a constant amplitude signal like a phase-shift keyed signal like QPSK when a single channel is active in a timeslot.

Large phase errors can occur if more than one channel is active since the constellation can have a symbol at or near the origin (0,0).

Comp. Phase Error (peak): The maximum of the instantaneous phase error of the composite

signal.

Frequency Error: The error between the center frequency and the estimated

frequency that is derived from the input signal. The estimated frequency is based either on the downlink pilot (DwPTS) or the midamble of the timeslot, selected with the Freq. & Phase Reference... setting in the measurement setup menu.

I/Q Imbal.: The imbalance between the level of the I channel to the level of

the Q channel. A value of 0.0 dB means that there is no imbalance (the I and Q channels have the same level).

I/Q Offset: This measures how far the origin of the constellation of the

composite signal is from the true origin (0,0).

The I/Q offset is included in the EVM calculations unless it is turned off in the measurement setup menu.

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Code Domain Power Measurement

The code domain power measurement measures the distribution of signal power across the set of code channels. The display can be in absolute power or normalized to the total timeslot power (defined by the Y Axis... setting in the V iew Scale menu). A bar graph is displayed that represents the power of each channel. This measurement allows you to verify that each code channel is operating at its proper level. Figure 2--11 shows an example of the code domain power measurement.

TD-SCDMA Measurements

Measurement results

Horizontal start

Figure 2- 11: Code domain power measurement

Display Elements

The following information is shown in the code domain power measurement display:

H Overview: The overview display area can contain the power versus time or

spectrogram measurement displays.

Selected code Power level OVSF code Spreading factor Modulation type

Vertical scale

Vertical start

Horizontal scale

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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 can contain one of the code domain

power related measurements.

The mainview also displays the numerical measurement results of the selected display. A Pass or Fail message (determined by the Limits settings) for each measurement is displayed. 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--24 for more information.

Setting the Timing

Parameters

Setting the Measurement

Parameters

You can set timing parameters for the code domain power 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 code domain power 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.

2- 24

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.

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TD-SCDMA Measurements

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.

H Mainview Content...: The mainview content display can be changed to

display one of the code domain related measurements. You can select Code Domain Power, Code Domain Power by Subframe, Code Domain Power by Symbol, or Power Codogram. The mainview also displays the numerical measurement results of the selected display. A Pass or Fail message (determined by the Limits settings) for each measurement is displayed. 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--25, 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.

Scale and Format in the

Mainview

This subsection describes the scale settings and display format in the mainview.

Code Domain Power Display. When you select Mainview Content from the VIEW DEFINE menu and then select Code Domain Power from the Mainview Content submenu, the code domain power for code channels is displayed (see Figure 2--12). The code domain power display shows the power in all code channels in the two-data bursts of the selected timeslot and subframe.

The measured values for code domain power are described the section Code Domain Power Measurement Readouts beginning on page 2--32.

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TD-SCDMA Measurements

Measurement results

Marker readout

Vertical scale

Vertical start

Horizontal scale

Horizontal start

A horizontal bar over a group of codes indicate a wider code.

Figure 2- 12: Code domain power display

The power bars use colors t o distinguish between active channels and inactive channels. Red indicates active, yellow indicates inactive.

A yellow horizontal bar above a set of active codes indicates that these codes have been detected as belonging to a single code channel at a spreading factor lower than 16. For example, a yellow bar over 2 codes m eans that this code is actually a single code channel with a spreading factor of 8.

NOTE. Whether a channel is active or inactive is determined by the ACTIVE CHANNEL THRESHOLD setting in the MEAS SETUP menu.

You can set the scale of 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.

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TD-SCDMA Measurements

H Horizontal Scale: Sets the scale of the horizontal axis (number of codes).

H Horizontal Start: Sets the code number of the first (left) value of the

horizontal axis.

H Vertical Scale (dB): Sets the scale of the vertical axis.

H Vertical Stop (dB): Sets the maximum (top) value of the vertical axis.

H Step Size (Horizontal Start / Vertical Stop): Sets the step size of the up

and down keys when changing the Horizontal Start or Vertical Stop settings.

A step size menu only displays if the Horizontal Start or Vertical Stop menu is selected.

H Full Scale (default scaling): Sets all scale values to their default full-scale

value.

H Y Axis...: Selects whether to represent the Y axis with relative values or

absolute values. When you select Relative, the Y axis represents the power relative to the total power of all channels. When you select Absolute, the Y axis represents the absolute power of each channel.

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TD-SCDMA Measurements

CDP by Subframe Display. When you select Mainview Content from the VIEW DEFINE menu and then select CDP by Subframe from the Mainview Content submenu, the code domain power in a single code channel is displayed for each subframe that has been analyzed (see Figure 2--13). The code domain power by subframe display s hows the power in a single code channel in the selected timeslot for each subframe.

CDP by subframe is useful for tracking the changes in the power of an active channel over time due to power control.

For the number of subframes analyzed (N), subframe 0 is the most recent and subframe N--1 is the oldest.

The measured values for code domain power are described the section Code Domain Power Measurement Readouts beginning on page 2--32.

Marker readout

Measurement results

Figure 2- 13: CDP by subframe display

You can set the scale of 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

H Horizontal Scale: Sets the scale of the horizontal axis (number of sub-

H Horizontal Start: Sets the subframe number of the first (left) value of the

Vertical scale

Vertical start

Horizontal scale

Horizontal start

axis to display the entire waveform.

frames).

horizontal axis.

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H Vertical Scale (dB): Sets the scale of the vertical axis.

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TD-SCDMA Measurements

H Vertical Stop (dB): Sets the maximum (top) value of the vertical axis.

H Full Scale (default scaling): Sets all scale values to their default full-scale

value.

H Step Size (Horizontal Start / Vertical Stop): Sets the step size of the up

and down keys when changing the Horizontal Start or Vertical Stop settings.

A step size menu only displays if the Horizontal Start or Vertical Stop menu is selected.

H Y Axis...: Selects whether to represent the Y axis with relative values or

CDP by Symbol Display. When you select Mainview Content from the VIEW DEFINE menu and then select CDP by Symbol from the Mainview Content submenu, the code domain power for the symbols is displayed (see Figure 2--14). The code domain power by symbol shows the despread power for each symbol period of the selected code, subframe, and timeslot.

The measured values for code domain power are described the section Code Domain Power Measurement Readouts beginning on page 2--32.

Marker readout

Measurement results

Figure 2- 14: CDP by symbol display

You can set the scale of the display using the VIEW SCALE menu. Press the VIEW SCALE key to open the menu.

Vertical scale

Vertical start

Horizontal scale

Horizontal start

H Auto Scale (Amplitude): Sets the start value and the scale of the vertical

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axis to display the entire waveform.

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TD-SCDMA Measurements

H Horizontal Scale: Sets the scale of the horizontal axis (number of symbols).

H Horizontal Start: Sets the 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 (dB): Sets the maximum (top) value of the vertical axis.

H Full Scale (default scaling): Sets all scale values to their default full-scale

value.

H Step Size (Horizontal Start / Vertical Stop): Sets the step size of the up

and down keys when changing the Horizontal Start or Vertical Stop settings.

A step size menu only displays if the Horizontal Start or Vertical Stop menu is selected.

H Y Axis...: Selects whether to represent the Y axis with relative values or

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TD-SCDMA Measurements

CDP Codogram Display. When you select Mainview Content from the VIEW DEFINE menu and then select CDP Codogram from the Mainview Content submenu, the code domain power is displayed as a codogram (see Figure 2--15). The codogram displays the code domain power for all codes in the selected timeslot over all analyzed subframes. The power in each code is represented by a color, with red indicating the highest power and blue representing the lowest power. The codes for a single subframe are displayed on the horizontal axis, with the vertical axis representing the subframe indices.

The CDP codogram provides an overview of the selected timeslot over time, allowing the user to quickly see changes in the code domain due to spreading factor changes, calls coming and going, and power control.

The measured values for code domain power are described the section Code Domain Power Measurement Readouts beginning on page 2--32.

Marker readout

Measurement results

Figure 2- 15: CDP codogram display

You can set the scale of the display using the VIEW SCALE menu. Press the VIEW SCALE key to open the menu.

H Auto Scale: Sets the start value and the scale of the vertical axis to display

H Horizontal Scale: Sets the scale of the horizontal axis.

H Horizontal Start: Sets the channel number of the first (left) value of the

H Vertical Size: Sets the scale of the vertical axis.

Vertical scale

Vertical start

Horizontal scale

Horizontal start

the entire waveform.

horizontal axis.

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TD-SCDMA Measurements

H Vertical Start: Sets the subframe value at the bottom of the vertical axis.

H Color Scale: Sets the scale (the value separating the minimum power value

from the maximum power value) of the color axis. The choices are 5, 10, 20, and50dB.

H Color Stop: Sets the stop value of the color axis.

H Full Scale: Sets the maximum value of the color axis to the reference level.

H Y Axis...: Selects whether to represent the Y axis with relative values or

Code Domain Power

Measurement Readouts

This section describes the measurement readouts displayed in the mainview of the code domain power measurements. The numerical measurement results reported are identical for each of the code domain power measurement displays.

Readout Description

Peak CDE: The peak code domain error is a measure of the power in the

residual error of each code. The residual error is calculated by subtracting a reference signal from the input signal. The peak code domain error is the maximum code domain error of all the codes (including both active and inactive channels). The Peak CDE readout shows the Peak CDE measurement and which code contained the peak error.

Peak Active CDE: The peak active code domain error is similar to the Peak CDE

measurement but is the maximum of the code domain error of just the active channels, excluding the inactive channels from the calculation.

Code Domain Error: The code domain error shows the error of the currently selected

code. The readout shows the code domain error and the selected code.

The code is selected with the Select Code setting in the measurement menu.

Number of Active Channels: This is the number of active channels that have been detected in

the current timeslot.

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Channel Power Measurement

The channel power measurement measures the channel power within a specified bandwidth and the power spectral density in dBm/Hz.

The channel power measurement is a single view display, unlike t he demodulation measurements such as modulation accuracy or code domain power. The channel power measurement cannot be displayed in the subviews of the demodulation measurements.

Figure 2--16 shows an example of the channel power measurement.

TD-SCDMA Measurements

Measurement

results

Figure 2- 16: Channel power measurement

Setting the Timing

Parameters

RSA3408A Option 28 User Manual

The channel power measurement only operates in freerun mode and therefore does not display timing settings when pressing the TIMING menu.

Timeslot alignment (from the start of a subframe) for the channel power measurement is determined by analyzing a sufficiently long IQ capture.

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TD-SCDMA Measurements

Setting the Measurement

Parameters

Once you’ve selected the channel power measurement, you can set the measurement parameters for the channel power using the MEAS SETUP menu. Most of the channel power measurement parameters are not shared with other measurements. Press the MEAS SETUP key to open the menu.

H Switching Point (timeslot): Sets the point where the timeslots switch from

uplink to downlink timeslots. You can set the value from 1 to 6. The timeslot switching point selection is a global setting for all TD-SCDMA demodulation and RF measurements.

H Select Timeslot: Sets the timeslot for the measurement. The control cycles

through TS0, DP (downlink pilot), UP (uplink pilot), TS1, TS2, TS3, TS 4, TS5, and TS6. The timeslot selection is a global selection for all TDSCDMA demodulation and RF measurements.

H Channel Bandwidth (Hz): Sets the channel bandwidth for the measure-

ment.

H Measurement Filter Shape...: Sets the filter to be used for the measure-

ment. You can select None, RootRaisedCosine, or RaisedCosine. The filters only affect the numerical measurement readouts, not the waveform display.

H Time Reference: Selects the timing reference. This setting is global to all

RF measurements.

H DwPts: Sets the downlink pilot as a time reference for each subframe.

This setting should only be used when the downlink pilot is present in the signal under test.

H UplinkTSPattern:Sets the timeslots indicated in the Uplink TS

Pattern setting as the time reference for each subframe. Specifying the timeslot pattern allows the instrument to determine proper timeslot identification in the absence of the downlink pilot time reference.

H UplinkTSPattern:Specifies which timeslots are the active uplink

timeslots. The uplink timeslot pattern is a concatenation of the uplink timeslots. For example, an uplink TS pattern of 13 indicates TS1 and TS3 are active uplink timeslots. The default pattern of 123 indicates TS1, TS2, and TS3 are active uplink timeslots. Integer patterns between 1 and 123456 are valid. This setting is used when the Time Reference is set to Uplink TS Pattern.

NOTE. UpPts can also be active, but does not need to be explicitly listed.

Downlink signals can not be active when using the pattern method to determine subframe timing.

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TD-SCDMA Measurements

H Active Timeslot Threshold (dB): Sets the threshold that determines if a

timeslot is active or inactive. A timeslot that is transmitting above this level is considered active.

H Limits...: Displays the limits editor to set the pass/fail limits for measure-

ments. The limits editor that displays is either the uplink or downlink editor, determined by whether the selected timeslot is an uplink or downlink timeslot. Refer to Editing the Measurement Limits, on page 2--65, for more information.

NOTE. Refer to the RSA3408A Real-Time Spectrum Analyzer User Manual for information about the scale settings for the display.

Changing the View

Contents

You can change the contents in the view using the VIEW DEFINE menu. Press the VIEW DEFINE key to open the menu.

H Grid Style: Sets the grid style in the view. You can select Off, Fix, or Flex.

For Flex, the grid is changed depending on frequency or span setting.

H Menu Off: Hides the side menu. To display the menu again, press t he

MENU side key or VIEW: DEFINE key.

You can set the scale of 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 (Hz): Sets the scale of the horizontal axis.

H Horizontal Start (Hz): Sets 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 (default scaling): Sets all scale values to their default full-scale

value.

H Step Size (Horizontal Start / Vertical Stop): Sets the step size of the up

RSA3408A Option 28 User Manual

and down keys when changing the Horizontal Start or Vertical Stop settings.

A step size menu only displays when the Horizontal Start or Vertical Stop menu is selected.

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TD-SCDMA Measurements

OBW Measurement

The OBW (Occupied Bandwidth) measurement measures the bandwidth that contains a certain percentage of the total integrated power of one timeslot using the percentage and timeslot you specify. The measured bandwidth is centered at the center frequency.

Figure 2--17 shows an example of the OBW measurement.

Measurement

results

Figure 2- 17: OBW measurement

Setting the Timing

Parameters

The TD-SCDMA OBW measurement only operates in freerun mode and therefore does not display timing settings when pressing the TIMING menu.

Timeslot alignment (from the start of a subframe) for the channel power measurement is determined by analyzing a sufficiently long IQ capture.

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TD-SCDMA Measurements

Setting the Measurement

Parameters

Once you’ve selected the OBW measurement, you can set the measurement parameters for OBW using the MEAS SETUP menu. Most of the OBW measurement parameters are not shared with other measurements. Press the MEAS SETUP key t o open the menu.

H Switching Point (timeslot): Sets the point where the timeslots switch from

uplink to downlink timeslots. You can set the value from 1 to 6. The timeslot switching point selection is a global setting for all TD-SCDMA demodulation and RF measurements.

H Select Timeslot: Sets the timeslot for the measurement. The control cycles

through timeslots 0, DP (downlink pilot), UP (uplink pilot), TS1, TS2, TS3, TS4, TS5, and TS6. The timeslot selection is a global selection for all TD-SCDMA demodulation and RF measurements.

H Power Ratio: Specifies the power ratio of the carrier and span regions for

calculating OBW. You can set the value from 80 to 99.99%. The default value is 99%.

H Channel Bandwidth (Hz): Sets the channel bandwidth for the measure-

ment.

H Measurement Filter Shape...: Filters are not implemented for the OBW

measurement.

H Time Reference: Selects the timing reference. This setting is global to all

RF measurements.

H DwPts: Sets the downlink pilot as a time reference for each subframe.

This setting should only be used when the downlink pilot is present in the signal under test.

H UplinkTSPattern:Sets the timeslots indicated in the Uplink TS

H UplinkTSPattern:Specifies which timeslots are the active uplink

NOTE. UpPts can also be active, but does not need to be explicitly listed.

Downlink signals can not be active when using the pattern method to determine subframe timing.

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TD-SCDMA Measurements

H Active Timeslot Threshold (dB): Sets the threshold that determines if a

timeslot is active or inactive. A timeslot that is transmitting above this level is considered active.

H Limits...: Displays the limits editor to set the pass/fail limits for measure-

NOTE. Refer to the RSA3408A Real-Time Spectrum Analyzer User Manual for information about the scale settings for the display.

Changing the View

Contents

You can change the contents in the view using the VIEW DEFINE menu. Press the VIEW DEFINE key to open the menu.

H Grid Style: Sets the grid style in the view. You can select Off, Fix, or Flex.

For Flex, the grid is changed depending on frequency or span setting.

H Menu Off: Hides the side menu. To display the menu again, press t he

MENU side key or VIEW DEFINE key.

You can set the scale of 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 (Hz): Sets the scale of the horizontal axis.

H Horizontal Start (Hz): Sets 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 of the up

and down keys when changing the Horizontal Start or Vertical Stop settings.

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A step size menu only displays when the Horizontal Start or Vertical Stop menu is selected.

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ACLR Measurement

TD-SCDMA Measurements

The Adjacent Channel Leakage Ratio (ACLR) measurement measures the amount of power leakage from the desired channel (active channel signal) to a nearby inactive channel by computing the ratio of the power in the active channel to the power in the inactive channel. The nearby channels can be one of the channels to the immediate left or right (adjacent channels) of the active channel or one channel further away (the alternate channels).

Since the ACLR measurement is made on multiple channels, it’s recommended that you set the analyzer to at least a 10 MHz span to allow the ACLR to be measured on the two adjacent and two alternate channels. A span of 5 MHz reduces the ACLR measurement to just the immediate adjacent channels. If the span setting is not wide enough for at least three channels, ACLR cannot be measured.

Figure 2--18 shows an example of the ACLR measurement.

Measurement

results

Figure 2- 18: ACLR measurement

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TD-SCDMA Measurements

Setting the Timing

Parameters

Setting the Measurement

Parameters

The ACLR measurement only operates i n freerun mode and therefore does not display timing settings when pressing the TIMING menu.

Timeslot alignment (from the start of a subframe) for the channel power measurement is determined by analyzing a sufficiently long IQ capture.

Once you’ve selected the ACLR measurement, you can set the measurement parameters for ACLR using the MEAS SETUP menu. Most of the ACLR measurement parameters are not shared with other measurements. Press the MEAS SETUP key t o open the menu.

H Switching Point (timeslot): Sets the point where the timeslots switch from

uplink to downlink timeslots. You can set the value from 1 to 6. The timeslot switching point selection is a global setting for all TD-SCDMA demodulation and RF measurements.

H Select Timeslot: Sets the timeslot for the measurement. The control cycles

through timeslots 0, DP (downlink pilot), UP (uplink pilot), TS1, TS2, TS3, TS4, TS5, and TS6. The timeslot selection is a global selection for all TD-SCDMA demodulation and RF measurements.

H Measurement Filter Shape...: Sets the filter to be used for the measure-

ment. You can select None, RootRaisedCosine, or RaisedCosine. The filters only affect the numerical measurement readouts, not the waveform display.

H Time Reference: Selects the timing reference. This setting is global to all

RF measurements.

H DwPts: Sets the downlink pilot as a time reference for each subframe.

This setting should only be used when the downlink pilot is present in the signal under test.

H UplinkTSPattern:Sets the timeslots indicated in the Uplink TS

H UplinkTSPattern:Specifies which timeslots are the active uplink

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TD-SCDMA Measurements

NOTE. UpPts can also be active, but does not need to be explicitly listed.

Downlink signals can not be active when using the pattern method to determine subframe timing.

H Active Timeslot Threshold (dB): Sets the threshold that determines if a

timeslot is active or inactive. A timeslot that is transmitting above this level is considered active.

H Limits...: Displays the limits editor to set the pass/fail limits for measure-

NOTE. Refer to the RSA3408A Real-Time Spectrum Analyzer User Manual for information about the scale settings for the display.

Setting the Span

Parameters

Changing the View

Contents

You can set the following measurement parameters using the SP AN menu. Press the SPAN key to open the menu.

H Span (Hz): Sets frequency range to be analyzed. This affects the number of

channels that are analyzed.

H Start Freq (Hz): Sets the minimum value of the frequency axis. The stop

frequency automatically adjusts according to the span setting.

H Stop Freq (Hz): Sets the maximum value of the frequency axis. The start

frequency automatically adjusts according to the span setting.

NOTE. Refer to the RSA3408A Real-Time Spectrum Analyzer User Manual for information about the span settings for the display.

You can change the contents in the view using the VIEW DEFINE menu. Press the VIEW DEFINE key to open the menu.

H Grid Style: Sets the grid style in the view. You can select Off, Fix, or Flex.

For Flex, the grid is changed depending on frequency or span setting.

H Menu Off: Hides the side menu. To display the menu again, press t he

MENU side key or VIEW DEFINE key.

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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 Auto Scale (Amplitude): Sets the start value and the scale of the vertical

axis to display the entire waveform.

H Horizontal Scale (Hz): Sets the scale of the horizontal axis.

H Horizontal Start (Hz): Sets 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 of the up

and down keys when changing the Horizontal Start or Vertical Stop settings.

A step size menu only displays when the Horizontal Start or Vertical Stop menu is selected.

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Spectrum Emission Mask Measurement

The spectrum emission mask (SEM) measurement verifies that the base station is not transmitting excessive power outside of its designated channel. The SEM measurement is not gated so it does not operate on any particular timeslot.

There are two SEM measurements available (selected from the measurement setup menu) based on different sets of limits: Offset From Channel and Inband Spurious. Figures 2--19 and 2-- 20 show examples of the spectrum emission mask measurements.

TD-SCDMA Measurements

Measurement

results

Figure 2- 19: Spectrum emission mask (offset from channel) measurement

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TD-SCDMA Measurements

Measurement

results

Figure 2- 20: Spectrum emission mask (inband spurious) measurement

Setting the Timing

Parameters

The TD-SCDMA spectrum emission mask measurement only operates in freerun mode and therefore does not display timing settings when pressing the TIMING menu.

Setting the Measurement

Parameters

Once you’ve selected the spectrum emission mask measurement, you can set the measurement parameters for SEM using the MEAS SETUP menu. Most of the SEM measurement parameters are not shared with other measurements. Press the MEAS SETUP key t o open the menu.

H Transmit Direction: Selects which limits table (uplink or downlink) is used

for limit checking. Changing the transmit direction for the SEM measurement may change the timeslot selection for other measurements depending on how the timeslots are defined for uplink and downlink.

H Measurement...: Selects the SEM measurement and limits table.

H Offset From Channel: The Offset From Channel limits are used where

the frequency zones are specified by the difference from the center frequency.

H Inband Spurious: The Inband Spurious limits are used where the

frequency zones are specified by the absolute frequency values.

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TD-SCDMA Measurements

H Ref. Channel Select: Selects the reference mode used to measure the

spectrum emission level. You can select Auto or Man (manual). For Auto, the reference level is measured from the input signal for the specified channel bandwidth. For Man, you can set the reference level in the Ref. Channel Level menu item.

H Ref. Channel Level (dBm): Sets or displays the reference level used to

measure the spectrum emission level. You can only set the reference level when the Ref. Channel Select is set to Man (manual) with a range from

--150 dBm to 30 dBm.

H Channel Bandwidth (Hz): Sets the channel bandwidth for the measure-

ment.

H Measurement Filter Shape: Sets the filter to be used for the measurement.

You can select None, RootRaisedCosine, or RaisedCosine. This setting is only available when Ref. Channel Select is set to Auto. The filters only affect the numerical measurement readouts, not the waveform display.

H Limits...: Displays the limits editor to set the pass/fail limits for measure-

Changing the View

Contents

H Scroll Table: Scrolls the table displayed in the view.

You can change the contents in the view using the VIEW DEFINE menu. Press the VIEW DEFINE key to open the menu.

H Grid Style: Sets the grid style in the view. You can select Off, Fix, or Flex.

For Flex, the grid is changed depending on frequency or span setting.

H Menu Off: Hides the side menu. To display the menu again, press t he

MENU side key or VIEW DEFINE key.

You can set the scale of 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 (Hz): Sets the scale of the horizontal axis.

H Horizontal Start (Hz): Sets 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.

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H Step Size (Horizontal Start / Vertical Stop): Sets the step size of the up

and down keys when changing the Horizontal Start or Vertical Stop settings.

A step size menu only displays when the Horizontal Start or Vertical Stop menu is selected.

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Timeslot Summary

TD-SCDMA Measurements

The timeslot summary measurement displays a power versus time graph of the selected timeslot within the selected subframe, and displays several timeslot-related statistics. The timeslot summary includes eight chips before timeslot, and eight chips after timeslot for visual reference. Figure 2-- 21 shows an example of the timeslot summary.

The measured values are described in Timeslot Summary Measurement Readouts on page 2--50.

Figure 2- 21: Timeslot summary

Display Elements

The following information is shown in the timeslot summary measurement display:

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Measurement results

Blue vertical line indicates

Ideal timeslot start chip

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TD-SCDMA Measurements

H Overview: The overview display area can contain the power versus time or

spectrogram measurement displays.

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 is fixed to display only the timeslot

summary measurement.

To change the contents in each of the views, use the VIEW DEFINE menu. Refer to Changing the View Contents on page 2--48 for more information.

Setting the Timing

Parameters

Setting the Measurement

Parameters

You can set timing parameters for the timeslot 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 timeslot summary measurement by using the MEAS SETUP menu. Press the MEAS SETUP key to open the MEAS SETUP menu. Refer to Measurement Parameters for Demodulation Measurements, beginning on page 2--62, for a description of the measurement parameters.

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Changing the View

Contents

You can change the view contents in the overview, 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

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).

RSA3408A Option 28 User Manual

TD-SCDMA Measurements

H Subview Content...: The subview content display can be changed to display

any of the TD-SCDMA demodulation measurements or the spectrum display.

H Mainview Content...: The mainview content display can not be changed

from timeslot summary but the mainview can be zoomed to the region tested for timeslot error.

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 menus only display when selecting the Horizontal Start or Vertical Stop menus.

H Zoom to Timeslot Start: Zooms the display into the region tested for the

timing error. Eight chips are shown before the timeslot and 60 chips after. A blue line is drawn to indicate the ideal timeslot start chip. The default scale for the timeslots is based on the width (number of chips) of the timeslot.

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TD-SCDMA Measurements

Blue vertical line indicates

Ideal timeslot start chip

Timeslot Summary

Measurement Readouts

Figure 2- 22: Timeslot summary, display zoomed

This section describes the measurement readouts displayed in the mainview of the timeslot summary measurement.

Readout Description

Timing Error The measured difference between the measured start of a

timeslot and the ideal start of the timeslot (relative to the selected subframe time reference).

Data1 power The RMS power in the data1 burst.

Data2 power The RMS power in the data2 burst.

Midamble power The RMS power in the midamble burst.

K The value of K for this timeslot. K is the maximum number of

midamble codes that can be used in the midamble of the current timeslot. See the 3GPP TDD LCR standard for detailed information.

Average burst power The RMS power over the entire timeslot.

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Transmit On/Off Mask

TD-SCDMA Measurements

The Transmit On/Off Mask measurement verifies that the Node--B or UE turns off its transmitter when it is not supposed to be emitting power. A power versus time graph of the selected subframe is overlaid on a limit mask. The instantaneous power is compared against the mask and a PASS/FAIL determination is made. Figure 2--23 shows an example of the transmit on/off mask.

The measured values are described in Transmit On/Off Mask Measurement Readouts on page 2--54.

Measurement results Downlink mask shown Uplink mask shown

Figure 2- 23: Transmit on/off mask

Display Elements

RSA3408A Option 28 User Manual

The following information is shown in the timeslot summary 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

spectrogram measurement displays.

demodulation measurements or the spectrum display.

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TD-SCDMA Measurements

H Mainview: The mainview display area is fixed to display only the transmit

on/off mask measurement.

To change the contents in each of the views, use the VIEW DEFINE menu. Refer to Changing the View Contents on page 2--52 for more information.

Setting the Timing

Parameters

Setting the Measurement

Parameters

You can set timing parameters for the transmit on/off mask 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 transmit on/off mask 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.

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Changing the View

Contents

You can change the view contents in the overview, subview using the VIEW DEFINE menu. Press the DEFINE key to display the VIEW DEFINE 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 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.

H Mainview Content...: The mainview content display can not be changed

from timeslot summary.

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TD-SCDMA Measurements

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 t he horizontal axis. This affects both

the normal and zoomed displays.

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. This affects

both the normal and zoomed displays.

H Mask Zoom Controls...: The zoom controls let you display a narrow region

of the mask, allowing you to quickly zoom in and analyze important parts of the mask. Figure 2--24 shows an example of a zoomed display.

H Zoom to Tx Mask Start: Zooms in to the beginning of the mask.

H Zoom to Tx Mask End: Zooms in to the end of the mask.

H Step Size (Horizontal Start / Vertical Stop): Sets the step size (amount per

RSA3408A Option 28 User Manual

H Zoom to Max Mid-Ramp Power: Zooms to the part of the mask that is

above the OFF power level but below the average ON power. For the downlink, it is near the ON to OFF transition and for the uplink, it is near the OFF to ON transition.

H Zoom to Max Tx OFF Power: Zooms to the location of the maximum

power of the input signal in the OFF portion of the mask.

H Horizontal Scale (s): Sets the scale of t he horizontal axis. This affects

both the zoomed and normal displays.

H Full Scale: Sets all scale values to their default full-scale value. This

affects both the zoomed and normal displays.

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.

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TD-SCDMA Measurements

Figure 2- 24: Zoom to Max Mid-Ramp Power selected

Transmit On/Off Mask

Measurement Readouts

This section describes the measurement readouts displayed in the mainview of the transmit on/off mask measurement.

Readout Description

Tx OFF Mid-Ramp Region

Max Power @Chip

Tx OFF Region

Max Power @Chip

The maximum mid-ramp power (in dBm) within the mid-ramp region. The chip value is the location where it occurs.

The maximum power (in dBm) within the mask region that is not part of the mid-ramp region. The chip value is the location where it occurs.

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Symbol Table Display

TD-SCDMA Measurements

The symbol table display shows the received data symbols in a code channel after descrambling and despreading. Figure 2--25 shows an example of the symbol table display.

Figure 2- 25: Symbol table display

Display Elements

RSA3408A Option 28 User Manual

The following information is shown in the symbol table 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 is fixed to display only the symbol

To change the contents in each of the views, use the VIEW DEFINE menu. Refer to Changing the View Contents on page 2--56 for more information.

spectrogram measurement displays.

demodulation measurements or the spectrum display.

table.

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TD-SCDMA Measurements

Setting the Timing

Parameters

Setting the Measurement

Parameters

You can set timing parameters for the symbol table acquisition by using the TIMING menu. Press the TIMING key to open the TIMING 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 symbol table measurement 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.