文章基本信息

标题：Orthogonal Chaotic Sequence for Use in Wireless Channels
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作者：Anamika Sarma ; Kandarpa Kumar Sarma ; Nikos Mastorakis 等
期刊名称：International Journal of Computers and Communications
印刷版ISSN：2074-1294
出版年度：2015
卷号：9
页码：21-29
出版社：University Press
摘要：Chaotic sequences are effectively used for secure communication. Generation of chaotic sequences continues to be an evolving area. Recently, stress has been given to the generation of orthogonal chaotic codes. In this paper, a chaotic spreading sequence based direct sequence/spread spectrum (DSSS) communication system is proposed. Here, a logistic map is used for generation of chaotic sequences used as a spreading factor in a DSSS system in Rayleigh fading channel. We discuss a method to make the chaotic code orthogonal to mitigate several disadvantages of the channel. The paper also includes a detail explanation of all the experimental work done in order to use orthogonal chaotic code as a spreading factor in various channels and related results and discussion. The bit-error rate (BER) and symbol error rate (SER) of the proposed system is compared with Gold code. Results show that the proposed system has a significant improvement in BER and SER. The mutual information, autocorrelation function and computational time of the system are also analyzed.
关键词：Logistic map; Chaotic code; Orthogonal code;Gold code; DSSS; Rayleigh fading