Title :
Bidirectional MMSE algorithms for interference suppression in DS-CDMA systems over fast fading channels
Author :
Clarke, Patrick ; De Lamare, Rodrigo C.
Author_Institution :
Dept. of Electron., Univ. of York, York, UK
Abstract :
This paper presents adaptive bidirectional minimum mean-square error (MMSE) parameter estimation algorithms for fast-fading channels. The time correlation between successive channel gains is exploited to improve the estimation and tracking capabilities of adaptive algorithms and provide robustness against time-varying channels. Bidirectional normalized least mean-square (NLMS) and conjugate gradient (CG) algorithms are devised along with adaptive mixing parameters that adjust to the time-varying channel correlation properties. An analysis of the proposed algorithms is provided along with a discussion of their performance advantages. Simulations for an application to interference suppression in DS-CDMA systems show the advantages of the proposed algorithms.
Keywords :
code division multiple access; conjugate gradient methods; fading channels; interference suppression; least mean squares methods; spread spectrum communication; time-varying channels; CG algorithm; DS-CDMA systems; adaptive bidirectional MMSE algorithm; adaptive bidirectional minimum mean-square error parameter estimation algorithm; adaptive mixing parameters; bidirectional NLMS algorithm; bidirectional normalized least mean-square algorithm; conjugate gradient algorithm; fast fading channels; interference suppression; successive channel gains; time correlation; time-varying channel correlation properties; tracking capabilities; Robustness; Bidirectional signal processing; adaptive interference suppression; adaptive receivers; fast-fading channels;
Conference_Titel :
Wireless Communication Systems (ISWCS), 2012 International Symposium on
Conference_Location :
Paris
Print_ISBN :
978-1-4673-0761-1
Electronic_ISBN :
2154-0217
DOI :
10.1109/ISWCS.2012.6328414
