改进相空间混沌及其在扩频通信中的应用  

Improved phase space chaos and its application in spread spectrum communication

作　　者：李杜娟[1] 吴成茂[1] 

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121

出　　处：《计算机工程与设计》2014年第1期67-73,260,共8页Computer Engineering and Design

基　　金：国家自然科学基金项目(90607008;61073106)

摘　　要：为了进一步提高扩频通信中数据传输的准确率和可靠性,提出改进相空间混沌信号并将其所产生混沌序列作为扩频码应用于扩频通信系统中。针对混沌扩频码中0、1数目太过均匀的不足,提出了函数和倍均值两种改进方法来降低扩频码中0、1间平衡度,测试分析改进前后混沌序列性能,将改进混沌序列作为扩频码用于扩频通信系统仿真其误码率性能,进行相关比较分析。仿真结果表明,两种改进混沌扩频码比改进前能获得更低误码率,尤其是函数改进混沌序列更有利于扩频系统需要,同时表明此次改进能改善扩频通信系统误码率性能。To further improve the accuracy and reliability of data transmission in the spread spectrum communication, the im proved phase space chaotic signals are proposed and the chaotic sequences generated by that are taken as spreading codes and used in spread spectrum communication system. As the deficiency of uniformity for the number of 0, 1 in chaotic spreading code, two improved methods of function and the times of mean are proposed to reduce the balance degree of 0, 1 in the spreading code, and the performances of the chaotic sequence are tested and analyzed before and after improvement. Improved chaotic sequence taken as a spreading code is applied to the spread spectrum communication system and its bit error rate （BER） performance is simulated and made relevant comparisons and analysis. The simulation experiment shows that the BER of two improved chaotic spreading codes is lower than that of before improvement, and especially, function improved chaotic sequence is more conducive to the needs of spread spectrum system, simultaneously shows that the improvements can improve the BER performance in spread spec- trum communication system.

关 键 词：混沌序列 扩频通信 扩频码 误码率 相空间法 

分 类 号：TN914.42[电子电信—通信与信息系统]