Conference Paper

Chaos aided synchronization for asynchronous multi-user chaos-based DS-CDMA

IRIT/ENSEEIHT, Univ. de Toulouse, Toulouse
DOI: 10.1109/ICECS.2008.4674979 Conference: Electronics, Circuits and Systems, 2008. ICECS 2008. 15th IEEE International Conference on
Source: IEEE Xplore

ABSTRACT In this paper we propose a new system for achieving synchronization in asynchronous multi-user chaos-based DS-CDMA. The synchronization is made through a binary code used as a pilot signal and the chaotic signal used as spreading data sequence. The study of this process is evaluated under the assumption of an additive white Gaussian noise channel. The probability of detection and probability of false alarm of this new method are derived.

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    ABSTRACT: In this paper we propose two systems for achieving synchronization in asynchronous multi-user chaos-based DS-CDMA. For the first system, synchronization process is realized thanks to a binary code used as an additive pilot sequence to the spreaded signal. Gold sequences are used as pilot signals for the different users to accomplish the synchronization. For the second synchronization system, the synchronization is made through a binary code used as a multiplicative pilot signal for the spreaded data sequence. These synchronization processes are evaluated under the assumption of an additive white Gaussian noise channel together with multi-user interferences. In this paper we will focus on the initial synchronization phase (code acquisition) and we assume that the system can achieve correctly the code tracking after this first synchronization phase. The code acquisition for the two systems is evaluated in terms of the probability of detection and probability of false alarm.
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    ABSTRACT: This paper presents the theoretical analysis of the acquisition phase of a chaos-based DS-CDMA system in the presence of fast fading. A statistical approach is taken to accurately model the acquisition phase with fast fading. Using this statistical approach, the main performance criteria for the acquisition phase namely probabilities of detection and failure are derived. The analytical derivation results are then compared to the simulation results with close agreement. It is found that the model developed is accurate in describing the behavior and performance of the acquisition phase in the presence of fast fading.
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