28 April 2004 Chip-level equalization in the WCDMA downlink
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Proceedings Volume 5284, Wireless Communications and Networks; (2004) https://doi.org/10.1117/12.521960
Event: Asia-Pacific Optical and Wireless Communications, 2003, Wuhan, China
Abstract
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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Qihui Wu, Qihui Wu, } "Chip-level equalization in the WCDMA downlink", Proc. SPIE 5284, Wireless Communications and Networks, (28 April 2004); doi: 10.1117/12.521960; https://doi.org/10.1117/12.521960
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