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M9079A TD-SCDMA X-Series Measurement Application for PXI Vector Signal Analyzers

Technical Overviews

TD-SCDMA X-Series Measurement Application for Modular Instruments

Expand the capabilities of your M9391A and M9393A PXIe vector signal analyzers (PXI VSAs) with the Keysight Technologies, Inc. library of measurement applica­tions – the same applications used to increase the capability and functionality of its X-Series signal analyzers. Eleven of the most popular applications are now available for use with Keysight’s new M9393A PXI performance VSA and the M9391A PXI VSA. When you combine the raw hardware speeds of the PXI VSAs and the X-Series measurement applications for modular instruments, you can test more products in less time while ensuring measurement continuity from design to manufacturing.

The TD-SCDMA measurement application transforms PXI VSAs into standard-based TD-SCDMA transmitter testers by adding fast, RF conformance measurements to help you speed up manufacturing of 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 one in a common library of measurement applications in the Keysight X-Series, an evolutionary approach to signal analysis that spans instru­mentation, measurements and software. Proven algorithms and a common user interface across the X-Series analyzers and modular PXI VSAs 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. You can further extend your test assets by utilizing up to four PXI VSAs with one software license.

Keysight’s X-Series applications for modular instruments also include a unique “Resource Manager” that provides direct access to PXI VSA hardware drivers for the fastest power and spectrum-based measurements, while simultaneously using the X-Series applications for fast modulation quality measure­ments and 89600 VSA for fast spectrum measurements.

TD-SCDMA Technical 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.

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. A detailed list of supported measurements is shown in Table 3.

Definitions

  • Specifications describe the performance of parameters covered by the product warranty.
  • 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. These values are not covered by the product warranty.
  • Typical values are designated with the abbreviation "typ." These are performance beyond specification that 80% of the units exhibit with a 95% confidence. These values are not covered by the product warranty.
  • 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, but is not covered by the product warranty.
  • 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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