基于Matlab的CDMA RAKE接收机性能仿真  

CDMA RAKE receiver performance simulation based on Matlab

作　　者：李伟[1] 张真[1] 吕路静 

机构地区：[1]黄河科技学院,河南郑州450063

出　　处：《现代电子技术》2015年第5期80-82,86,共4页Modern Electronics Technique

基　　金：郑州市无线与移动通信网络应用技术创新团队(121PCXTD511)

摘　　要：CDMA移动通信系统中,受到建筑物和地形地貌的影响,通信环境十分复杂,通信系统的通信质量受到严重影响。CDMA系统采用RAKE接收技术,它可以在时间上分辨出细微的多径信号,这样便把多径信号加以利用,克服了多径衰落带来的影响,达到增强接收效果的目的。在对RAKE接收机基础理论进行分析的基础上,采用Matlab仿真软件对不同用户状态下的RAKE接收机性能进行仿真,并对最大比合并、等增益合并、选择式合并这三种合并方式进行比较,给出仿真结果及误码率性能参数。然后,针对CDMA系统中RAKE接收机的性能进行建模仿真,仿真结果表明,CDMA系统中采用RAKE接收机起到了抗多径干扰、提高系统性能的目的。Since the CDMA mobile communication system is affected by the building and landform, its communication environment is very complex, and its communication quality are badly affected. CDMA system using RAKE receiving technology can distinguish the subtle multipath signal in time, and can take advantage of the multipath signal to overcome the effects of multipath fading and enhance the reception capacity. Based on the basic theory analysis of RAKE receiver, Matlab simulation software is adopted to perform performance simulation of RAKE receiver under different user states. Three combining modes of maximum ratio, gain, selection are compared. The simulation results and bit error rate performance parameters are given. The performance of the RAKE receiver in the CDMA system is modeled and simulated. The simulation results show that RAKE receiver used in CDMA system can play a role of anti-multipath interference, and can improve system performance.

关 键 词：CDMA RAKE接收技术 多径信号 MATLAB 

分 类 号：TN911-34[电子电信—通信与信息系统]