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TD-SCDMA X-Series Measurement Application N9079A & W9079A

Technical Overviews

Introduction

  • TD-SCDMA RF transmitter measurements
  • HSDPA/HSUPA/8PSK modulation and code domain analysis support
  • Demodulation availability of code channel with phase shift or rotation for multi-carrier TD-SCDMA signals
  • One-button tests with pass/fail limits per 3GPP standard
  • Hardkey/softkey manual user interface and SCPI remote user interface
  • Built-in, context sensitive help
  • Transportable license between X-Series signal analyzers

TD-SCDMA Measurement Application

The TD-SCDMA measurement application transforms the X-Series signal analyzers into standard-based TD-SCDMA transmit­ter testers by adding fast, one-button RF conformance measurements to help you design, evaluate, and manufacture your TD-SCDMA devices. Software capability is further enhanced by adding support to phase shift or rotation for multi-carrier TD-SCDMA signals, allowing you to stay on the leading edge of design and manufacturing challenges.

The TD-SCDMA measurement application is just one in a common library of more than 25 measurement applications for the Keysight Technologies, Inc. X-Series signal analyzers, an evolutionary approach to signal analysis that spans instrumentation, measurements and software. The X-Series analyzers, with upgradeable CPU, memo­ry, disk drives, and I/O ports, enable you to keep your test assets current and extend instrument longevity. Proven algorithms, 100% code-compatibility, and a common UI across the X-Series create a consis­tent measurement framework for signal analysis that ensures repeatable results and measurement integrity so you can le­verage your test system software through all phases of product development. In addition to fixed, perpetual licenses for our X-Series measurement applications, we also offer transportable licenses which can increase the value of your investment by allowing to you transport the applica­tion to multiple X-Series analyzers.

TD-SCDMA Technology Overview

Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) combines FDMA, CDMA and TDMA 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 China Wireless Telecommunication Standards group (CWTS) and approved as a 3G technology by ITU in 1999. The TD-SCDMA standard now is fully supported by 3GPP and 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. In combination of Time Division Multiple Access (TDMA) and Time Division Duplex (TDD), the TD-SCDMA technology is based on the backbone of TDMA-TDD operation which significantly improves network performance by allowing radio resources to process network traffic in both directions, per uplink and downlink. There are 7 time slots (numbered 0 through 6) in a single 5 ms long frame, and within each time slot there are up to 16 code channels that are available to allocate to a single user or to distribute among multiple users. Time division duplexing is used to separate uplink and downlink periods in a given time frame. Therefore, a resource unit (RU) is defined by a frequency, time slot, and code channel with spreading factor. The basic resource unit uses a spreading factor of 16. In TD-SCDMA, the chip rate is 1.28 Mcps and each carrier signal occupies 1.6 MHz bandwidth. Since the adoption of TD-SCDMA by the 3GPP body, the standard has continued to evolve. As with W-CDMA, the high-speed downlink packed access (HSDPA) and the high-speed uplink packed access (HSUPA) specifications for TD-SCDMA were added into 3GPP Release 5 and, respectively, HSPA+ features for TDD are part of 3GPP Release 8. Meanwhile, the 3GPP has specified UMTS Long Term Evolution (LTE) TDD mode as the evolution patch for TD-SCDMA, which is also referred to as TD-LTE. 

RF Transmitter Tests

With the TD-SCDMA measurement ap­plication, perform RF transmitter mea­surements on BTS and mobile devices in time, frequency and modulation domains. The TD-SCDMA and HSPA signals as well as HSPA+ signals with all modula­tion formats, as shown in Table 2, can be measured.

Standard-based RF transmitter tests

The RF transmitter test requirements for TD-SCDMA are defined in TS 25 and 34 series of 3GPP standard.

Measurement details

All of the RF transmitter measurements as defined by the 3GPP standard, as well as a wide range of additional measurements and analysis tools, are available with a press of a button. These measurements are fully remote controllable via the IEC/IEEE bus or LAN, using SCPI commands.

Analog baseband measurements are avail­able on the PXA or MXA signal analyzer with BBIQ option. Supported baseband measurements include EVM and power versus time.

Definitions

95th percentile values indicate the breadth of the population (≈2σ) of performance tolerances expected to be met in 95% of cases with a 95% confidence. Typical values are designated with the abbreviation “typ.” These are performance beyond specification that 80% of the units ex­hibit with a 95% confidence. Nominal values are designated with the abbre­viation “nom.” These values indicate expected performance, or describe product performance that is useful in the application of the product.

PXA specifications apply to analyz­ers with frequency options of 526 and lower. For analyzers with higher frequency options, specifications are not warranted but performance will nominally be close to that shown in this section.

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