Title: Performance analysis of multi user chaotic communication system using orthogonal chaotic vector
Authors: S. Venkatesh; Poonam Singh
Addresses: Department of Electronics and Communication Engineering, National Institute of Technology Rourkela, Rourkela 769008, India ' Department of Electronics and Communication Engineering, National Institute of Technology Rourkela, Rourkela 769008, India
Abstract: The quasi-orthogonal characteristic of the chaotic vectors leads to residual cross-correlation which results in Multiuser Interface (MUI) under multiple user scenarios. The effect of MUI increases in proportion to the number of users. In order to eliminate the effect of MUI we propose the use of Orthogonal Chaotic Vector (OCV) as spreading sequence to spread the message data in multi user chaotic communication system. Simulation work is carried out considering both AWGN and fading channel. Analytical expressions for BER are derived for both AWGN and fading channels and are compared with that of simulation results.
Keywords: OCVSK; orthogonal chaotic vector shift keying; OCV; orthogonal chaotic vectors; chaos; Gram-Schimdt orthonormalisation; AWGN; fading channels; simulation; multi-user communications.
International Journal of Signal and Imaging Systems Engineering, 2012 Vol.5 No.4, pp.260 - 266
Received: 05 Feb 2011
Accepted: 25 Mar 2011
Published online: 31 Dec 2014 *