混沌序列用于DS-CDMA可行性研究

阐述了Chebyshev混沌序列的产生，在高斯白噪声环境下，对基于多址干扰（MAI）最小准则的最佳Chebyshev混沌序列与传统Gold序列分别用于DS—CDMA系统的误码率性能进行了Matlab仿真．仿真研究表明，基于MAI最小的最佳Chebyshev混沌序列与传统的伪随机序列具有类似的相关性，而且，Chebyshev混沌序列对初值极其敏感．通过给不同用户分配不同初值，可以得到互不相关混沌序列，满足码分多址的要求．加性高斯白噪声环境下，使用优选Chebyshev扩频的异步DS—CDMA系统在单用户情况下的误码率性能与传统Gold序列相近，而在多用户情况下，优选Chebyshev混沌序列具有较优的抗多址干扰性能．

Feasibility Study on the DS-CDMA System Using Chaotic Sequence

An analysis on the generation of the Chebyshev chaotic sequences is presented in this paper.Matlab simulation is used for comparing the error bit rate(EBR) performance in asynchronous DS-CDMA systems between traditional Gold sequences and optimal Chebyshev sequences based on the minimal multi-access interference.The results show that the Chebyshev sequence and the pseudo noise sequence have the similar correlation performance.Furthermore,the Chebyshev sequences are sensitive to the initial values.Disrelated sequences fitting for the requests of the CDMA system can be gotten by distributing different initial values.Well choosed Chebyshev sequences have similar performance of error bit rate in asynchronous DS-CDMA systems at the signal user environment.While in multi-users environment,Chebyshev sequences have better resistance of the decreasing performance of the EBR caused by multiaccess in asynchronous DS-CDMA.