Adaptive generalized rake reception in DS-CDMA systems - [transactions papers]

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 perform...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2009-07, Vol.8 (7), p.3464-3474
Main Authors: Fulghum, T., Cairns, D., Cozzo, C., Wang, Y.-P., Bottomley, G.
Format: Article
Language:English
Subjects:
Applied sciences
channel estimation
Coherent demodulation
Delay
Detection, estimation, filtering, equalization, prediction
Downlink
Equalizers
Equipments and installations
Exact sciences and technology
Fingers
Information, signal and communications theory
Interference suppression
Mobile radiocommunication systems
Multiaccess communication
Multiple access interference
Performance gain
Radiocommunications
RAKE receivers
Signal and communications theory
Signal, noise
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Transmitters. Receivers
Wideband
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Summary: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.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2009.060330