Adaptive generalized rake reception in DS-CDMA systems

Authors:
Tracy L. Fulghum;Douglas A. Cairns;Carmela Cozzo;Y.-P. Eric Wang;Gregory E. Bottomley
Affiliations:
Ericsson, Inc., Research Triangle Park, NC;Ericsson, Inc., Research Triangle Park, NC;Enerdyne Technologies - Viasat, Inc., El Cajon, CA,;Ericsson, Inc., Research Triangle Park, NC;Ericsson, Inc., Research Triangle Park, NC
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

Citing 7
Cited 2

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Abstract

Direct-sequence code-division multiple-access (DS-CDMA) 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.