Accurate bit error rate calculation for asynchronous chaos-based DS-CDMA over multipath channel

Authors:
Georges Kaddoum;Daniel Roviras;Pascal Chargé;Daniele Fournier-Prunaret
Affiliations:
IRIT Laboratory, University of Toulouse, Toulouse cedex, France;LAETITIA Laboratory, CNAM Paris, Paris, France;LATTIS Laboratory, University of Toulouse, Toulouse cedex 4, France;LATTIS Laboratory, University of Toulouse, Toulouse cedex 4, France
Venue:
EURASIP Journal on Advances in Signal Processing
Year:
2009

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Abstract

An accurate approach to compute the bit error rate expression for multiuser chaosbased DS-CDMA system is presented in this paper. For more realistic communication system a slow fading multipath channel is considered. A simple RAKE receiver structure is considered. Based on the bit energy distribution, this approach compared to others computation methods existing in literature gives accurate results with low computation charge. Perfect estimation of the channel coefficients with the associated delays and chaos synchronization is assumed. The bit error rate is derived in terms of the bit energy distribution, the number of paths, the noise variance, and the number of users. Results are illustrated by theoretical calculations and numerical simulations which point out the accuracy of our approach.