跳频码分多址系统中混沌跳频序列的优选与仿真  

The optimization of quaternary chaotic spreading sequences and system simulation

作　　者：张琪[1] 郑君里[1] 刘栩[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《电波科学学报》2003年第3期242-246,共5页Chinese Journal of Radio Science

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：根据跳频码分多址系统的特点 ,总结了跳频序列的性能分析准则 ,并据此提出了混沌跳频序列的优选方法。通过对大量不同初值的混沌序列进行筛选 ,得到了性能优异的混沌跳频序列组。与改进型Lempel Greenberger(L G)序列相比 ,优选混沌跳频序列数目多 ,完全消除频隙滞留现象 ,而且平均汉明相关特性与之非常接近。为了验证优选混沌序列的性能 ,在AWGN信道下在跳频异步码分多址系统中进行了仿真 ,结果证明优选混沌序列的抗多址干扰能力逼近改进型LIn terms of characteristics of the frequency-hopped (FH) asynchronous CDMA (A-CDMA) system, this paper summarizes the property analysis criteria of FH codes, and presents a method to optimize chaotic codes. By arbitrating the chaotic codes with these criteria, we obtained chaotic FH codes having good properties. Compared with the improved Lempel-Greenberger (L-G) codes, the size of the selected chaotic FH codes set is large, no neighbouring frequency slots stay on the same position, and the average Hamming correlation property is very close to that of the improved L-G codes. Monte Carlo simulation is carried out on the AWGN channel. The simulation result shows that the ability of the selected chaotic codes to restrain multiple access interference approximates that of the improved L-G codes.

关 键 词：跳频码分多址 混沌跳频序列 性能分析准则 优选方法 AWGN 

分 类 号：TN929.533[电子电信—通信与信息系统] TN914.41[电子电信—信息与通信工程]