89601B/BN-B7X TD-SCDMA Modulation Analysis, 89600B Vector Signal Analysis Software

Technical Overview

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 specified 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

TD-SCDMA Modulation Analysis

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 TDSCDMA, 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 automatic detection of multiple mid-amble 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 signal 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 virtually every facet of a problem, helping you see the “why?” behind signal problems.

Whether you’re working with emerging or established standards, Keysight’s industry-leading 89600B VSA software helps you see through the complexity.

TD-SCDMA technology overview

Time division-synchronous code division multiple access (TD-SCDMA) combines FDMA and CDMA technologies. Unlike W-CDMA and cdma2000® technologies, this TDD standard transmits and receives on the same frequency, which greatly increases spectrum efficiency.

Because TD-SCDMA effectively handles symmetrical and asymmetrical traffic, it is ideal for data-intensive applications, such as mobile internet access and multimedia applications.

TD-SCDMA was proposed by the China Wireless Telecommunication Standards group (CWTS) and approved as a 3G technology by ITU in 1999.

The TDSCDMA standard is fully supported by 3GPP and the China Communication 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 Access (UTRA) as the UTRA-TDD option. 

Analysis and Troubleshooting

Gain insight into your signal with 20:20 visibility The 89600B VSA software profiles 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 field power error information. Compare all these values at baseband, IF, and RF. 

Review your signal’s performance with CDE and CDP data 

Code domain error (CDE) and code domain power (CDP) results are available for the layer or the composite signal in either averaged or instantaneous 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. 

Get a clear view of composite signals 

Composite denotes trace data results for the composite signal, which includes all spread code lengths (symbol 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. 

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 channel error summary data provides both bit demodulation and detailed overall error measurements.