Theoretical performance for asynchronous multi-user chaos-based communication systems on fading channels

Authors:
Georges Kaddoum;Martial Coulon;Daniel Roviras;Pascal Chargé
Affiliations:
IRIT Laboratory, University of Toulouse, 2 rue charles camichel, 31071 Toulouse cedex, France and LACIME Laboratory, University of Québec, ETS, 1100, Notre-Dame west, Montréal, Canada H3 ...;IRIT Laboratory, University of Toulouse, 2 rue charles camichel, 31071 Toulouse cedex, France;LAETITIA Laboratory, CNAM Paris, 292 rue Saint-Martin, 75003 Paris, France;LATTIS Laboratory, University of Toulouse, 135 Avenue de Rangueil, 31077 Toulouse cedex 4, France
Venue:
Signal Processing
Year:
2010

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Abstract

In this paper, we present a study of the bit error rate (BER) performance of chaos-based DS-CDMA system over an m-distributed fading channel. In this system, the perfect synchronization between receiver and transmitter is assumed. The transmitted bit energy after spreading by chaotic signal is not considered as constant in order to evaluate with precision the BER for such system. The performance of chaos-based DS-CDMA system is examined first in mono-user case. An approximation of the received bit energy by a known distribution leads to an accurate analytical BER expression. This BER computation approach is generalized for asynchronous multi-user case. The performance of DS-CDMA system using Gold sequence is compared and discussed to chaos-based DS-CDMA system. A perfect match between simulations and analytical BER expressions confirms the exactitude of our approach.