Technical Overview

Keysight Technologies

89601B/BN-B7X TD-SCDMA Modulation Analysis

89600B Vector Signal Analysis Software

2

Table of Contents

Key Features .....................................................................................................2

TD-SCDMA Modulation Analysis ................................................................3

Analysis and Troubleshooting ......................................................................4

Software Features ...........................................................................................8

Key Specifications ...........................................................................................11

Ordering Information ......................................................................................13

Additional Resources .....................................................................................14

Key Features

– Analyze downlink and uplink signals, all modulation formats:

QPSK, 16QAM, HSDPA/8PSK/64QAM

– Choose the analysis level you need: timeslot, composite, or code channel/layer

– See CDE and CDP results for composite signal or speciied code layer – Get a 20:20 view of the entire signal using 20 traces, sized the way you want,

each with 20 markers

– Evaluate your error budget at baseband, IF, and RF

3

Troubleshoot and analyze TD-SCDMA

modulation and RF performance with

Option B7X for Keysight Technology’s

89600B vector signal analysis (VSA)

software. One of a family of options

for the 89600B VSA software, this

analysis package includes the 3GPP

N-TDD 1.28 Mcps version of TD-

SCDMA, including HSDPA (16QAM,

64QAM, and 8PSK).

Option B7X demodulates HSDPA

16QAM and 8PSK modulated code

channels, with automatic detection

of code channel modulation type,

including manual override and auto-

matic detection of multiple mid-am-

ble shifts. Get maximum visibility into

the signal with single code domain

layer or composite power and code

domain displays. Normalize code-

domain power to display code domain

power relative to total signal power.

Make automatic measurements of

rho, EVM, frequency error, I/Q offset,

I/Q skew and more.

TD-SCDMA is just one of over 70 sig-

nal standards and modulation types

for which the 89600B vector signal

analysis (VSA) software creates a

window into what’s happening inside

your complex wireless devices. The

89600B tools provide views of virtu-

ally every facet of a problem, helping

you see the “why?” behind signal

problems. Whether you’re working

with emerging or established stan-

dards, Keysight’s industry-leading

89600B VSA software helps you see

through the complexity.

Try before you buy!

Download the 89600B software and use it free for 14 days to make

measurements with your analysis hardware, or use our recorded demo

signals by selecting File > Recall > Recall Demo > TD-SCDMA > on the

software toolbar.

Request your free trial license today:

www.keysight.com/ind/89600B_trial

TD-SCDMA Modulation Analysis

TD-SCDMA technology overview

Time division-synchronous code

division multiple access (TD-SCD-

MA) combines FDMA and CDMA

technologies. Unlike W-CDMA and

cdma2000® technologies, this TDD

standard transmits and receives on

the same frequency, which greatly in-

creases spectrum eficiency. Because TD-SCDMA effectively handles sym-

metrical and asymmetrical trafic, it is ideal for data-intensive applications,

such as mobile internet access and

multimedia applications. TD-SCDMA

was proposed by the China Wire-

less Telecommunication Standards

group (CWTS) and approved as a 3G

technology by ITU in 1999. The TD-

SCDMA standard is fully supported

by 3GPP and the China Communica-

tion Standards Association (CCSA).

The 3GPP TD-SCDMA standard is

also known as the low chip rate (LCR)

option of TDD, which is included in the

3GPP Universal Terrestrial Radio Ac-

cess (UTRA) as the UTRA-TDD option.

4

Analysis and Troubleshooting

Gain insight into your signal with 20:20 visibility

The 89600B VSA software proiles the signal’s power over time with

up to 20 traces with 20 markers

each, allowing you to look at overall,

composite, and layer performance,

simultaneously. An error summary

table provides detailed pilot phase

coding information and individual

timeslot error data, with chip timing,

total power, midamble power and

data ield power error information. Compare all these values at base-

band, IF, and RF.

View overall, composite, and layer data. The Overall Time trace, which provides an arrow to indicate

the uplink/downlink status of each timeslot, shows timeslot 6 selected. IQ constellations for the layer

and composite signals appear in Traces E and C.

Insightful display formats help characterize signals. Here, a captured signal has been replayed using

overlap processing to effectively “slow it down.” The cumulative history display format (Trace B),

highlights signal performance over very long periods.

5

Review your signal’s performance with CDE and CDP data

Code domain error (CDE) and code

domain power (CDP) results are avail-

able for the layer or the composite

signal in either averaged or instan-

taneous value form. The CDE of a

particular code channel is a measure

of the error power in a code channel

relative to the total signal power. CDP

is an analysis of the distribution of

signal power across the set of code

channels normalized to the total

signal power. Together they provide

key insight into the performance of a

TD-SCDMA system.

CDE and CDP data is shown in a multi-color format that assigns a unique color to each active code

layer, for easy visual identiication. Markers on the composite trace help with the identiication of code layers.

Dynamic Help quickly links you to the explanation of a menu or trace. Here, it provides information on

the Channel/Layer tab where you can select the desired despread channel and CDP code layer that

you would like to display.

6

Get a clear view of composite signals

Composite denotes trace data results

for the composite signal, which in-

cludes all spread code lengths (sym-

bol rate) and code channels. These

measurements, useful for evaluating

the overall in-band performance of

the signal, include: composite code

domain power (CDP) and composite

code domain error (CDE), as well as

time domain measurements such as

rho, EVM, EVM spectrum, and EVM

time.

Detailed error information on the composite signal performance of a single timeslot provides the

next layer of powerful troubleshooting. Note that for error traces with time (chips) on the x-axis, the

midamble location is denoted.

7

Open a window into your signal with channel analysis

The 89600B lets you look at your

signal one channel at a time. Specify

the code channel and spread code

length to uniquely specify a channel,

and you can look at its IQ trajectory

and errors over time. Detailed chan-

nel error summary data provides both

bit demodulation and detailed overall

error measurements.

The Channel Error Summary table provides detailed modula-

tion quality statistics for a selected channel/layer. Phase

and Magnitude Error traces are available to examine error

over time. Use the Channel/Layer tab of the Demodulation

Properties tab to select a despread channel.

89600B VSA is the industry-leading measurement software for evalu-

ating and troubleshooting wireless signals in R&D. PC-based and sup-

porting numerous measurement platforms, the 89600B provides the

lexibility and sophisticated measurement tools essential to inding and ixing signal problems.

X-Series advanced measurement applications provide embedded

format-speciic, one-button measurements for X-Series analyzers. With fast measurement speed, pass/fail testing and sim-

plicity of operation, these applications are ideally suited for design

veriication and manufacturing.

www.keysight.com/ind/X-Series_Apps

Choosing between 89600B VSA software and X-Series measurement applications

8

Software Features

Signal acquisition

Result length 1 to 8 subframes maximum. Value hardware dependent

Start boundary Sub-frame, 2 frames

Time reference Trigger point, downlink pilot, uplink pilot

Samples per symbol

(code channel results)

1

Samples per chip

(composite results)

1

Triggering Single/continuous, external

Measurement region Analysis timeslot selectable within irst sub-frame

Signal playback

Result length 1 to 8 subframes maximum. Value hardware dependent

Capture length (gap-free analysis at 0%

overlap at 1.6 MHz span)

Capture length is hardware dependent. See hardware speciications for more information.

Format

Standards supported 3GPP TDD 1.28 Mc/s option, Release 5.0.0, December 2003

Formats Downlink, uplink

Single-button presets 3GPP N-TDD 1.28 Mcps

Modulation formats QPSK, 16QAM, HSDPA/8PSK/64QAM

Adjustable parameters

Format parameters

Chip rate Continuously adjustable

Filter alpha Continuously adjustable between 0.05 and 1.0

Enable HSPA/8PSK

Code/ID parameters

Downlink pilot sequence 0 to 311

Uplink pilot sequence 0 to 2551

Scramble sequence 0 to 1271

Basic midamble sequence 0 to 1271

Midamble autodetect Detects midamble code ID and sets Basic Midamble and Scrambling Code IDs (when in Mid-

amble subframe synchronization mode)

Max users (selectable for each timeslot) 2, 4, 6, 8, 10, 12, 14, 16

Force code group settings

Downlink pilot Downlink pilot code ID acts as master to determine the Code Group states. Non-standard code

ID sequence allocations also allowed via Code Group check boxes.

Any code User-selected Code ID (downlink pilot, uplink pilot, scramble or basic midamble) determines

master for Code Group states

1. Value dependent on Force Code Group settings.

9

Channel/layer parameters

Despread channel parameters Speciies the timeslot and code channel with spreading factor that is used for the channel measurement data results

Spread code length (despread

channel)

Used along with the Despread Channel Code Channel to specify the active code layer and

channel used for the channel trace data measurement results

Code channel (despread

channel)

Used along with the Despread Channel Spread Code Length to specify the active code channel

and layer used for the channel trace data

CDP layer parameters Speciies the active (displayed) code domain layer for the CDP layer and CDE layer trace data

Spread code length (despread

channel)

Selects the active code domain layer (Spread Code Length) for the CDP Layer trace data

Modulation scheme parameters Speciies how the modulation type used for demodulation is detected

Auto-detect for all code

channels

Tests all code channels for SF1 and SF16 for modulation formats QPSK and 16QAM, then per-

forms analysis based on the detected modulation format (HSPA/8PSK only)

Manual Speciies the parameters that determine the TD-SCDMA Modulation Scheme used in the signal analysis: SF “Spread Factor”, Chan and Mod Type

Time parameters

Result length Determines the signal capture length in terms of sub frames for used for demodulation and

signal analysis

Time reference Speciies the time reference used to compute the Overall Error Summary - Timing Error data results

Start boundary Speciies when to start the Result Length data capture

Uplink switch point Speciies which Trafic TimeSlots are uplink and which are downlink

Analysis timeslot Speciies which sub-frames timeslot, within the selected Analysis Sub-frame, is used for analy-

sis and trace data measurement results

Analysis sub-frame Speciies which sub-frame, within the acquired Result Length, is used for analysis and trace data measurement results

Advanced parameters

Active slot threshold Sets the active slot detection threshold a value dB below the slot with the largest measured

power

Subframe synchronization Pilot, midamble

Slot frequency reference Pilot, midamble

Active channel threshold Sets the threshold above which a code channel is detected active and included in the Compos-

ite Reference waveform (auto, manual)

Normalize IQ traces Applies trace data normalization to the trace data results

Mirror frequency spectrum Correctly demodulates frequency spectrums that are mirrored (lipped) about the center frequency

Include IQ offsest in EVM Controls whether the Composite IQ Offset is included Composite EVM data result

Show raw QPSK symbols Affects the Composite Symbols display pilot bits or midamble bits, depending on which times-

lot is the Analysis TimeSlot

10

Measurement results

Composite All code channels at once or all symbol rates taken together.

IQ measured Time, spectrum

IQ reference Time, spectrum

IQ error versus time Magnitude and phase (IQ measured versus reference); including instantaneous

Error vector Time, spectrum (vector difference between measured and reference); including instantaneous

Error summary EVM, magnitude error, phase error, rho, peak active CDE, peak CDE, frequency error, IQ offset,

IQ skew, slot amplitude droop

Symbols Table of symbol numbers and value

Channel Time domain trace data results for a single code channel within a speciied code layer

IQ measured Time

IQ reference Time

IQ error versus time Magnitude and phase (IQ measured versus reference)

Error vector Time (vector difference between measured and reference)

Symbol table and error summary EVM, magnitude error, phase error, code phase (degs), detected modulation, data bits

CDP/CDE data All code channels at once or speciied code layer

Code domain power All symbol rates taken together; individual symbol rates (80, 160, 320, 640, 1280 ksps); avail-

able for composite signal, speciied layer, instantaneous composite, or instantaneous layer

Code domain error All symbol rates taken together; individual symbol rates (80, 160, 320, 640, 1280 ksps); avail-

able for composite signal, speciied layer, instantaneous composite, or instantaneous layer

Overall Time domain trace data results derived from the channel X pre demodulated TD-SCDMA

burst data

Time Aligned analysis region; active timeslots highlighted

Filtered time IQ time, RRC iltered, resampled to 4x chip rate

Error summary Timing error, total power, midamble power, data power for each timeslot, data power left (be-

fore preamble), and data power right (after preamble)

Chan X trace data Time and frequency trace results from pre-demodulated chan X input data

Analysis timeslot Analyze single timeslot for time, spectrum, PDF, CDF, CCDF

Pre-demodulation Time, spectrum, correction, raw main time, instantaneous spectrum

Display formats

Overall time measurement results Active timeslots highlighted with background color

DP and CDE measurement results Active code channels highlighted by CDP layer color

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Key Speciications1

This technical overview provides nominal performance speciications for the software when making measurements with the speciied platform. Nominal values indicate expected performance, or describe product performance that is useful in the application of the product, but is not covered by the product warranty.

For a complete list of speciications refer to the measurement platform literature.

X-Series signal analyzers

PXA MXA (includes

Option BBA as noted)

EXA

Signal playback

Result length 1 to 8 sub-frames 1 to 8 sub-frames 1 to 8 sub-frames

Capture length > 25,000 sub-frames > 50 sub-frames > 50 sub-frames

Gap free analysis at 0% overlap;

1.6 MHz span

> 26,200 sub-frames with

Opt. BBA (BBIQ only)

Accuracy

Conditions 10 MHz to 3.6 GHz, input range > –30 dBm and within 5 dB of total signal power

Code domain

CDP accuracy Spread channel power within 20 dB of total power

±0.3 dB ±0.3 dB 2

±0.3 dB

Symbol power versus time Spread channel power within 20 dB of total power

±0.3 dB ±0.3 dB 2

±0.3 dB

Composite EVM

EVM loor ≤ 1.5% ≤ 1.5% 2 ≤ 1.5%

Frequency error

Lock range ±500 Hz ±500 Hz ±500 Hz

Accuracy ±10 Hz ±10 Hz ±10 Hz

1. Data subject to change.

2. Results apply to MXA with Option BBA.

12

PSA ESA

Signal playback

Result length 1 to 8 sub-frames 1 to 5 sub-frames 1

Capture length Gap free analysis at 0% overlap; 1.6 MHz span

10 sub-frames 5 sub-frames 1

Accuracy

Conditions 10 MHz to 3 GHz, input range

≥ –24 dBm and within 5 dB of total signal power

Input range within 5 dB of total signal power,

between 30 MHz and 3 GHz

Code domain

CDP accuracy Spread channel power within 20 dB of total power

±0.3 dB ±0.3 dB

Symbol power versus time Spread channel power within 20 dB of total power

±0.3 dB ±0.3 dB

Composite EVM

EVM loor ≤ 1.5% ≤ 1.5%

Frequency error

Lock range ±500 Hz ±500 Hz

Accuracy ±10 Hz ±10 Hz

Other analysis platforms

1. Requires frequency span ≤ 2.5 MHz, sub-frame start boundary. Drops to 2 sub-frames for two frame start boundary.

13

Model-Option Description Notes

PC/Instrument

license

Floating

license

89601B 89601BN 89600B VSA software Required

89601B-B7X 89601BN-B7X TD-SCDMA modulation

analysis

Required for

TD-SCDMA modula-

tion analysis

89601B-200 89601BN-200 Basic vector signal

analysis

Required

89601B-300 89601BN-300 Hardware connectivity Required

Ordering Information

Software licensing and conigurationChoose from two license types:

– PC/instrument license: Order

89601B if the software license

will reside on a PC/instrument.

The license can be trans ferred

to another PC/instrument at any

time.

– Floating license: Order 89601BN

if the software license will reside

on a server to be accessed by

multiple users, one at a time.

Hardware coniguration

The 89600B software supports over

30 instrument platforms including

spectrum analyzers, oscilloscopes,

logic analyzers and modular instru-

ment systems with its hardware

connectivity option (89601B/BN-

300).

www.keysight.com/ind/89600B_hardware

Keep your 89600B VSA up-to-date

With rapidly evolving standards and continuous advancements in signal

analysis, the 89601BU/BNU software update and subscription service

offers you the advantage of immediate access to the latest features and

enhancements available for the 89600B VSA software.

www.keysight.com/ind/89600B

You can upgrade!

All 89600B options can be added after your initial purchase and are

license-key enabled. For more information please refer to

www.keysight.com/ind/89600B_upgrades

Additional Resources

Literature

89600B Vector Signal Analysis Software, Brochure,

literature number 5990-6553EN

89600B Vector Signal Analysis Software, Configuration Guide,

literature number 5990-6386EN

89600B Opt 200 Basic VSA and Opt 300 Hardware Connectivity,

Technical Overview, literature number

5990-6405EN

Web

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A personalized view into the information most relevant to you.

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Keysight’s commitment to superior product quality and lower total cost

of ownership. The only test and measurement company with three-year

warranty standard on all instruments, worldwide.

Keysight Assurance Plans

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Up to five years of protection and no budgetary surprises to ensure your

instruments are operating to specification so you can rely on accurate

measurements.

www.keysight.com/quality

Keysight Technologies, Inc.

DEKRA Certified ISO 9001:2008

Quality Management System

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breadth, combined with channel partner convenience.

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Industry Association.

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the PCI Industrial Computer Manufacturers Group.

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14 | Keysight | 89601B/BN-B7X TD-SCDMA Modulation Analysis, 89600B Vector Signal Analysis Software - Technical Overview

This information is subject to change without notice.© Keysight Technologies, 2011-2014Published in USA, August 1, 20145990-6393ENwww.keysight.com