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Adaptive interference suppression for DS-CDMA systems based on interpolated FIR filters with adaptive interpolators in multipath channels

de Lamare, Rodrigo C. and Sampaio-Neto, Raimundo (2007) Adaptive interference suppression for DS-CDMA systems based on interpolated FIR filters with adaptive interpolators in multipath channels. IEEE Transactions on Vehicular Technology. pp. 2457-2474. ISSN 0018-9545

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In this work we propose an adaptive linear receiver structure based on interpolated finite impulse response (FIR) filters with adaptive interpolators for direct sequence code division multiple access (DS-CDMA) systems in multipath channels. The interpolated minimum mean-squared error (MMSE) and the interpolated constrained minimum variance (CMV) solutions are described for a novel scheme where the interpolator is rendered time-varying in order to mitigate multiple access interference (MAI) and multiple-path propagation effects. Based upon the interpolated MMSE and CMV solutions we present computationally efficient stochastic gradient (SG) and exponentially weighted recursive least squares type (RLS) algorithms for both receiver and interpolator filters in the supervised and blind modes of operation. A convergence analysis of the algorithms and a discussion of the convergence properties of the method are carried out for both modes of operation. Simulation experiments for a downlink scenario show that the proposed structures achieve a superior BER convergence and steady-state performance to previously reported reduced-rank receivers at lower complexity.

Item Type: Article
Copyright, Publisher and Additional Information: © Copyright 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: adaptive algorithms,direct-sequence code-division multiple access (DS-CDMA),multiuser detection,reduced-rank receivers,MULTIUSER DETECTION,WIENER FILTER,CANCELER,DS/CDMA,DESIGN
Institution: The University of York
Academic Units: The University of York > Electronics (York)
Depositing User: Ms Diana Hilmer
Date Deposited: 12 Nov 2007 12:38
Last Modified: 10 Apr 2016 00:04
Published Version: http://dx.doi.org/10.1109/TVT.2007.899931
Status: Published
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/3479

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