异步码分多址通信中混沌扩频序列的研究

Research on chaotic spreading sequences for asynchronous CDMA communication

为了增加异步码分多址通信系统的可用码组，研究了在该系统中使用混沌扩频序列的可能性。针对异步码分多址的特性，提出了选择扩频序列的一系列判据，分析了混沌序列可能达到的性能极限，并以此为依据找出了性能更佳的混沌序列实例。数值计算表明，新的混沌序列码组比ｌｏｇｉｓｔｉｃ映射产生的混沌序列码组在性能上有较大提高。

In order to expand the group of ades on communication system with asynchronous code division multiaddress (CDMA), the possibility of using chaotic spreading sequences was researched. Aiming at the characteristic of asynchronous CDMA, some performance indexes on choosing spreading sequences were proposed. Limit of the performance was also discussed. According to the indexes, instances of chaotic spreading sequences which have better performance are presented. Calculation shows that new chaotic spreading sequences are much better than those which are generated by logistic map.