多用户混沌扩频通信系统的Rake接收误码分析  

BER Analysisin Multi-user Chaotic Spread Spectrum Communication System with Rake Receiver

作　　者：李巍[1] 何世彪[1] 

机构地区：[1]重庆大学通信工程学院,重庆400030

出　　处：《计算机仿真》2011年第3期130-134,共5页Computer Simulation

摘　　要：研究移动通信技术优化传输性能,在扩频通信系统中,针对多径信道的存在而产生了多径衰落问题,为了抗衰落和减少误码率,根据Rake接收机则具有良好的对抗多径衰落的效果,提出理论公式的推导,建立正确模型,在理想的信道参数估计器和混沌同步为前提下,假设多径信道的各个路径具有恒定增益。在混沌的多用户DS-CDMA扩频通信系统中,采用Rake接收机,对系统的理论误码率进行了推导,将误码公式以能量分布、多径数目、用户数和混沌序列平均功率的形式给出,并通过Matlab对理论值与实际值进行了仿真比较,仿真结果表明实际值和理论值基本吻合,证明了推理过程的正确性。In the chaotic spread-spectrum communication system,due to the presence of multi-path channel,a multi-path fading is produced and Rake receiver has good effect against the multi-path fading.BER is an important indicator to measure system performance,so its theoretical derivation of the formula is particularly important.With an ideal channel parameter estimator and chaos synchronization,assuming that the multi-path channel has a fixed gain,we carry out a detailed derivation of the theoretical BER of the system in the multi-user DS-CDMA spread spectrum communication system based on chaos in the multipath channel with Rake receiver,and finally the BER formula is derived in the form of the energy distribution,the number of the multi-paths,the number of users and chaotic sequences average power,and then makes a comparison between the theoretical values and the actual values through Matlab.The simulation results show that the actual values and theoretical values are basically consistent which prove the reasoning progress.

关 键 词：混沌扩频 接收机 码分多址 误码率 

分 类 号：TN914.4[电子电信—通信与信息系统]