2008•Acta Physica SinicaOpen access

A method for generating chaotic spread-spectrum sequences and their optimized selection algorithm

Yu Zhen-Biao, Feng Jiu-chao, 华南理工大学电子与信息学院，广州 510641

Abstract

A method for generating chaotic spread-spectrum sequences based on the combined chaotic map is proposed. An optimized selection algorithm based on the property requirement of spread-spectrum sequences and the performance index of multiple access interference is also presented. Simulation is performed for the optimized chaotic sequence, and an optimized logistic sequence is applied to a direct sequence spread-spectrum CDMA system under different channel conditions. The results show that the chaotic spread-spectrum sequences generated by the proposed method have similar performance as the logistic spread-spectrum sequences and have better security.

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Key concepts: Chaotic, Spread spectrum, Logistic map, Algorithm, Selection (genetic algorithm), Sequence (biology), Computer science, Interference (communication)