混沌序列在DS-CDMA中的应用研究  

Application of Chaos in DS-CDMA

作　　者：李晓潮[1] 郭东辉[1] 曾权[1] 吴伯僖[1] 

机构地区：[1]厦门大学技术物理研究所,厦门361005

出　　处：《计算机工程与应用》2003年第11期22-26,共5页Computer Engineering and Applications

基　　金：国家自然科学基金项目(编号:60076015);福建省自然科学基金项目(编号:A0010019);福建省高新技术项目等经费的资助。

摘　　要：相对于伪随机序列(PN)码,混沌序列码具有较好的自相关和互相关性能,它有望替代PN码在直序扩谱码分多址(DS-CDMA)通讯系统中得到应用,以提高通讯系统的容量及性能。该文通过介绍IS-95CDMA的标准,说明了混沌数字CDMA的兑现原理,并以蔡氏混沌电路为例,分析了混沌序列信号的随机性和相关性及其电路的同步功能。最后,通过计算机数值仿真来进一步验证混沌随机序列在DS-CDMA系统中应用的可能性。The specific characteristics of chaotic sequence,randomness and initial condition sensitive,suggest that it should have good auto-correlation and weak cross-correlation.These advantages motivate the research of(CD) 2 MA to improve the performance of CDMA system and lower down the multi-access interference by replacing the classic binary pseudo-random sequence with chaotic sequence.This paper introduces the schemes of(CD) 2 MA after preliminarily going through the IS -95standard.Taking Chua's circuit as an example,the paper analyzes the characteristics of chaotic sequence and implement s the impulsive synchronization between two chaotic systems.The experimental simulation is taken to verify the actual capability of(CD) 2 MA.

关 键 词：混沌电路 伪随机序列 直序扩谱 码分多址 混沌同步 自相关性 互相关性 

分 类 号：TN929.533[电子电信—通信与信息系统] O414.22[电子电信—信息与通信工程]