Performance enhancement of DS/CDMA system using chaotic complex spreading sequence

Author

Kurian, Ajeesh P. ; Puthusserypady, Sadasivan ; Htut, Su Myat

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore

Volume

4

Issue

3

fYear

2005

fDate

5/1/2005 12:00:00 AM

Firstpage

984

Lastpage

989

Abstract

In this paper, a novel direct sequence/spread spectrum (DS/SS) communication system is proposed. This scheme exploits the two-dimensional complex valued chaotic Ikeda map as the spreading sequences. With this double spreading DS/SS system, the effect of multiple access interference can be mitigated by choosing the spreading sequences with appropriate cross-correlation properties. The performance of the system is assessed and demonstrated in a multiuser environment by means of computer simulation with additive white Gaussian noise, Rayleigh fading, and selective fading channel conditions. These studies reveal that the proposed system significantly outperforms the Gold code DS/SS-BPSK system in synchronous channel conditions. In asynchronous case, the improvement is substantial for low signal-to-noise ratios.

Keywords

AWGN channels; Rayleigh channels; chaotic communication; code division multiple access; interference suppression; multiuser channels; phase shift keying; radiofrequency interference; spread spectrum communication; DS-CDMA system; Rayleigh fading channel; additive white Gaussian noise channel; chaotic Ikeda map; chaotic complex spreading sequence; crosscorrelation property; direct sequence spread spectrum communication system; multiple access interference; multiuser channel; selective fading channel; signal-to-noise ratio; spreading sequence; synchronous channel; Additive white noise; Chaos; Chaotic communication; Computer simulation; Fading; Gold; Multiaccess communication; Multiple access interference; Rayleigh channels; Spread spectrum communication; Chaotic dynamics; Ikeda map (IM); direct sequence/spread spectrum (DS/SS); multiple acess interference(MAI);

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2005.847028

Filename

1427688