Adaptive Generalized Rake Reception in DS-CDMA Systems

作者：Fulghum Tracy L^*; Cairns Douglas A; Cozzo Carmela; Wang Y P Eric; Bottomley Gregory E

来源：IEEE Transactions on Wireless Communications, 2009, 8(7): 3464-3474.

DOI：10.1109/TWC.2009.060330

• Coherent demodulation
• channel estimation
• rake receivers

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.

• 出版日期2009-7