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Proceedings Paper

Chip-level equalization in the WCDMA downlink
Author(s): Qihui Wu
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Paper 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.

Paper Details

Date Published: 28 April 2004
PDF: 6 pages
Proc. SPIE 5284, Wireless Communications and Networks, (28 April 2004); doi: 10.1117/12.521960
Show Author Affiliations
Qihui Wu, Southeast Univ. (China)
PLA Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 5284:
Wireless Communications and Networks
Chih-Lin I; Jiann-An Tsai; Hequan Wu, Editor(s)

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