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Multi-user Receivers for Synchronous and Asynchronous Transmissions for Chaos-based Multiple-access Systems by Martial Coulon; Daniel Roviras is a Computer Science article available to read on EtoBox.

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## a b s t r a c t This paper addresses the problem of multi-user detection for a multiple-access system based on chaotic communications. In particular, one considers the differential chaos shift keying (DCSK) modulation. Two kinds of transmissions are considered: synchronous transmissions, where the bit epochs are aligned at the receiver, and asynchronous transmissions. Different detectors are studied for both kinds of transmissions: (i) an optimal receiver, which minimizes a least-squares criterion; this detector requires the knowledge of many user characteristics; (ii) an adaptive LMS detector, which converges to the previous detector without any a priori knowledge concerning the chaotic sequences; this detector is then better suited for practical applications; (iii) detectors based on the estimation of the chaotic sequences. Theoretical performance results are derived for all these detectors. Simulation results are reported, which confirm the theoretical analysis and allows one to compare the proposed detectors. These results show that the chaotic-sequence estimation (CSE)-based detectors are only fitted for synchronous transmissions, but give poor results for asynchronous tran

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Author

Martial Coulon; Daniel Roviras

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0165-1684)

Published

2009

Language

EN

Field

Computer Science (Physical Sciences)