混沌扩频序列在CDMA通信系统中的应用

混沌是非线性系统中出现的确定性的、类随机的过程.混沌系统最基本的特征是对初始条件极端敏感,这些独具特色的性质使得混沌在通信应用领域尤其在伪随机码的产生方面有着很好的应用前景.本文首先分析几类混沌动力学模型-Logistic、Kent、chebyshev、logistic-chebyshev混沌序列,随后以MATLAB的Simulink为仿真平台,把混沌扩频序列应用到DS-CDMA系统中.分析不同混沌扩频序列在多址环境和多径环境下的误码率,验证了混沌扩频技术应用于CDMA通信系统中的可行性和优越性.

Chaotic spreading spectrum sequences applications in CDMA communication system

Chaos is produced by deterministic nonlinear systems,its phenomena is pseudo random.Chaotic systems exhibit sensitivity to initial conditions.For all these special performance,chaos has a excellent outlook in the application of telecommunication,especially in the generation of PN sequence.In this paper,we put forward Several kinds of chaotic system chaotic model such as Logistic,Kent,Chebyshev,Logistic-chebyshev and analysis its chaotic performance.Different kinds chaotic spreading spectrum sequences are used to DS-CDMA.We study them on the MATLAB's Simulink platform.We analysis bit error rate of different kinds chaotic spreading spectrum sequence in MAI and MPI.The feasibility and superior performance of chaotic spreading spectrum technology used to DS-CDMA communication system has been greatly proved.