Mr. Qihui Wu Profile

Qihui Wu

at Southeast Univ

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Proceedings Article | 28 April 2004 Paper

Chip-level equalization in the WCDMA downlink

Qihui Wu

Proceedings Volume 5284, (2004) https://doi.org/10.1117/12.521960

KEYWORDS: Receivers, Multiplexing, Systems modeling, Optical correlators, Detection and tracking algorithms, Communication engineering, Pulse filters, Signal processing, Forward error correction, Telecommunications

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In the downlink of WCDMA systems, the different users are multiplexed synchronously to transmission channel by short orthogonal spreading codes that user specific and a long overlay scrambling code that is base-station specific. It is well known that in a multiple-user synchronous DS-CDMA system with multi-path fading, the widely used rake receiver is sub-optimal. Moreover, as the chip rate increases in high rate wireless applications, the underlying multi-path channels become time dispersive, and introduce frequency selective effects. For WCDMA downlink, receivers based on channel equalization at chip level have been proposed to ensure adequate performance even with a high number of active users. These receivers equalize the channel prior to the dispreading, thus restoring the orthogonality of users and resulting multiple access interference (MAI) suppression. The chip-level equalizer has proven to be one of the most promising terminal receivers for WCDMA/FDD downlink. In this paper, we summarize the technology of the chip-level equalization for WCDMA downlink.

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