Performance comparison of chaotic spreading sequences generated by two different classes of chaotic systems in a chaos-based direct sequence-code division multiple access system

In the world of wireless communications, achieving a highly secure transmission at the lowest possible performance degradation has presented a major challenge and a number of conventional direct-sequence-code division multiple access (DS-CDMA)-based solutions have been put forward that deals with th...

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Bibliographic Details
Published in:IET communications 2013-07, Vol.7 (10), p.1024-1031
Main Authors: Rahnama, Nazila, Talebi, Siamak
Format: Article
Language:English
Subjects:
1D chaotic system
3D chaotic system
additive white Gaussian noise
Algorithms
AWGN
BER
binary code
binary codes
bit‐error rate
Channels
Chaos theory
chaotic communication
chaotic spreading sequences
code division multiple access
code generation speed
code sequences
direct sequence‐code division multiple access system
Division
DS‐CDMA‐based solutions
error statistics
Fading
fading channels
flat‐fading channel
Gold code
interuser interference
Multiple access
pseudonoise spreading codes
radiocommunication
radiofrequency interference
secure transmission
spread spectrum communication
Spreading
telecommunication security
Three dimensional
three‐dimensional chaotic system
wireless communications
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Summary:In the world of wireless communications, achieving a highly secure transmission at the lowest possible performance degradation has presented a major challenge and a number of conventional direct-sequence-code division multiple access (DS-CDMA)-based solutions have been put forward that deals with the issue. This study aims to overcome the challenge by introducing a new approach that employs a chaotic sequence in DS-CDMA system over fading channels. The proposed algorithm, which assumes a perfect sync between the transmitter and the receiver, generates a binary code by using a three-dimensional (3D) chaotic system. Simulations based on a flat-fading channel with additive white Gaussian noise and inter-user interference reveal that the new approach outperforms codes generated by other classes of chaotic systems, that is, the 1D chaotic system. The results also proved the proposition's performance is comparable to conventional pseudo-noise spreading codes, the Gold code, in several key aspects including security of transmission, bit-error rate, code generation speed and the number of possible code sequences.
ISSN:1751-8628
1751-8636
1751-8636
DOI:10.1049/iet-com.2012.0763