采用混沌扩频序列的异步码分多址通信系统仿真  

A-CDMA system simulation with chaotic spreading sequences

作　　者：张琪[1] 郑君里[1] 简相超[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2002年第7期901-904,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目 (60 0 72 0 0 1) ;清华大学"九八五"基金资助项目 (EE9918)

摘　　要：为了获取适用于异步码分多址系统的混沌序列 ,提出了一种基于扩频序列性能分析准则的优选方法 ,并用系统仿真的方法进行了验证。通过对异步码分多址系统的性能分析 ,总结了扩频序列的性能准则 ,以此为依据对初值不同的混沌序列进行筛选 ,可以得到性能优异的混沌扩频序列。采用 Monte Carlo的方法 ,在无线衰落信道下对采用混沌序列和 Gold序列的异步码分多址系统进行了仿真。结果表明 :优选的混沌序列性能要优于 Gold序列 。The properties of spreading sequences greatly influence CDMA system performance. The characteristics of asynchronous CDMA systems are used to develop property analysis criteria for spreading sequences. Chaotic sequences are optimized using the property analysis criteria with the resulting chaotic spreading sequences having good properties. Monte Carlo simulations of an A CDMA system with chaotic sequences and Gold sequences for a wireless fading channel show that the properties of optimized chaotic sequences are better than those of gold sequences in A CDMA systems. Therefore, optimized chaotic sequences can be applied in A CDMA systems as spreading sequences.

关 键 词：异步码分多址通信系统 性能分析准则 混沌扩频序列 优选方法 衰落信道 系统仿真 MonteCarlo方法 

分 类 号：TN914.53[电子电信—通信与信息系统]