DocumentCode :
3416787
Title :
A fixed-lag particle smoothing algorithm for the blind turbo equalization of time-varying channels
Author :
Guimarães, Alberto Gaspar ; El Fquih, Boujemaa Ait ; Desbouvries, François
Author_Institution :
Inst. Mil. de Eng., Rio de Janeiro
fYear :
2008
fDate :
March 31 2008-April 4 2008
Firstpage :
2917
Lastpage :
2920
Abstract :
We introduce a novel sequential importance sampling (SIS) algorithm for the blind equalization of doubly selective channels. Our algorithm propagates a Monte Carlo (MC) approximation of the posterior fixed-lag smoothing distribution of the symbols. As we shall see, it is possible to sample particles from the optimal importance distribution and to update the smoothing importance weights accordingly. We next apply the developed method as a SISO (soft input soft output) equalizer in a turbo receiver framework. The performance evaluation of our algorithm is carried out under different fading scenarios, and the results are compared with a soft iterative channel estimation scheme available in the literature.
Keywords :
blind equalisers; channel estimation; importance sampling; iterative methods; radio receivers; smoothing methods; time-varying channels; Monte Carlo approximation; SISO equalizer; blind turbo equalization; fixed-lag particle smoothing algorithm; posterior fixed-lag smoothing distribution; sequential importance sampling algorithm; soft iterative channel estimation; time-varying channel; turbo receiver; Bit error rate; Blind equalizers; Channel estimation; Forward error correction; Intersymbol interference; Iterative algorithms; Monte Carlo methods; Smoothing methods; Time-varying channels; Viterbi algorithm; Blind Equalization; Sequential Importance Sampling Methods; Turbo Equalization;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on
Conference_Location :
Las Vegas, NV
ISSN :
1520-6149
Print_ISBN :
978-1-4244-1483-3
Electronic_ISBN :
1520-6149
Type :
conf
DOI :
10.1109/ICASSP.2008.4518260
Filename :
4518260
Link To Document :
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