Testing the Chinese 3G standard

Racal Instruments has developed what it claims is the first software system for measuring the transmitter performance of 3G mobiles designed to meet the Chinese TD-SCDMA standard.

The Wireless Solutions Group of Racal Instruments, working under a Co-operative agreement with the Chinese Academy of Telecommunications Technology (CATT), has developed what it claims is the first software system – T-AIR – for measuring the transmitter performance of 3G mobiles designed to meet the Chinese TD-SCDMA standard.

Until now, engineers have been limited by digital spectrum analyser capabilities, which only provided raw I and Q data measurements. This made the analysis of a transmitter’s performance exceptionally difficult, if not impossible.

Recognising the need for better performance measurements, Racal Instruments developed the T-AIR test solution. T-Air software converts raw I and Q data into meaningful measurements that include error vector magnitude, code domain power and peak code domain error – all crucial in determining the robustness of a design.

It is also able to display the transmit on/off power profile and constellation diagrams giving engineers additional useful data.

Editor’s note: In June 2001, Racal Instruments signed an agreement with CATT. As part of this agreement, Racal Instruments will support the field trials of the TD-SCDMA standard and develop a range of test solutions covering applications for development, production, installation and commissioning. TD-SCDMA is one of three international competing 3G standards, the others being W-CDMA and CDMA2000.

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