Author(s):

Tracy L. Fulghum, Douglas A. Cairns, Carmela Cozzo, Y.-P. Eric Wang, and Gregory E. Bottomley

IEEE Trans. Wireless Communications 2009

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Adaptive Generalized Rake Reception in DS-CDMA Systems (pdf)

Abstract:
Direct-sequence code-division multiple-access (DSCDMA) cellular systems, such as Wideband CDMA (WCDMA), are limited in performance by interference. Linear equalization, such as generalized Rake (G-Rake) receivers and transversal chip equalizers, can theoretically provide significant gains in performance by suppressing interference. In this paper, an adaptive G-Rake receiver is developed, employing practical algorithms for finger placement and weight computation. Finger placement is determined by selecting delays from a candidate set using a “maximal-weight” criterion. Weight computation includes estimation of an impairment covariance matrix using a parametric approach. While described in the context of the downlink, these algorithms can be used in the uplink as well. Both single-antenna and dual-antenna receivers are considered. Link and system performance are evaluated for the downlink, showing significant gains in high-rate coverage.

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