Lawrance, Anthony J. and Yao, Ji. (2008) Likelihood-based demodulation in multi-user chaos shift keying communication. Circuits, Systems and Signal Processing, Vol.27 (No.6). pp. 847-864. ISSN 0278-081X

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Abstract

This paper deals with the theory of multi-user chaos shift keying communication systems in the coherent case and in particular with bit error performance under near optimal demodulation. The new approximated likelihood and near optimal demodulator is based on the statistical likelihood of the received signal and is a theoretical generalization of the conventional correlation demodulator involving autocorrelations of the spreading. Near optimal theoretical results beginning from an exact analysis are derived for the bit error rate of a typical user; there is emphasis on their structure in regard to separating the effects of channel noise and interference from other users, and in comparison with single-user results. The new demodulator is shown under particular assumptions to be a form of rake demodulator in the sense that it involves autocorrelation-like terms at various lags. The results are illustrated by theoretical calculations and numerical simulations which point out the enhanced performance of the near optimal demodulator relative to the correlation demodulator.

Item Type:	Journal Article
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science > Statistics
Library of Congress Subject Headings (LCSH):	Bit error rate, Telecommunication systems, Chaotic behavior in systems, Signal theory (Telecommunication), Electromagnetic interference, Demodulation (Electronics)
Journal or Publication Title:	Circuits, Systems and Signal Processing
Publisher:	Birkhaeuser Boston
ISSN:	0278-081X
Date:	December 2008
Volume:	Vol.27
Number:	No.6
Number of Pages:	18
Page Range:	pp. 847-864
Identification Number:	10.1007/s00034-008-9063-6
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), Overseas Research Students Awards Scheme (ORSAS)
Grant number:	GR/M74795 (ESPRC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/28934

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