混沌扩频序列的产生及其在CDMA中的应用

Generation of chaotic spread spectrum sequences and its application in CDMA system

以改进型的Logisti-Map为基础,采用迭代法生成混沌序列。讨论了该序列的敏感性、遍历性、抗噪性和概率分布密度等特性,对混沌CDMA(CodeDivisionMultipleAccess)直扩多用户系统多址干扰进行了分析。仿真实验结果表明,混沌序列与传统的伪随机序列相比,具有产生简单、码源丰富、抗干扰能力强等特性,适合充当扩频通信中的扩频序列。

Chaotic spread spectrum sequences are created by iteration method based on Logistic-map. The sensitivity, ergodicuty, anti-interference and probability distribution density of the sequences are studied. MAI(Multiple Access Interference) of multiuser system in chaotic DS-CDMA is analyzed. Simulation results show that chaotic sequences have the properies of simple generation, rich code elements, ergodicuty and sensitivity compared with PN(Pseudo-random Number) sequences, It meets the demand of spread-spectrum sequence in the spread-spectrum communication system.