Turbo CPM系统在衰落信道下性能研究  

Performance of turbo CPM in rayleigh fading channels

作　　者：韩志学[1] 毕文斌[2] 张兴周[1] 陆建勋[2] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001 [2]中国舰船研究院,北京100085

出　　处：《哈尔滨工程大学学报》2007年第1期87-92,共6页Journal of Harbin Engineering University

基　　金：中船重工集团重点基金资助项目(10y-0401)

摘　　要：探讨了基于Turbo原理进行迭代检测的编码连续相位调制(CPM)系统在瑞利衰落信道下的性能.根据CPM的分解模型,把CPM分解为连续相位编码(CPE)与无记忆调制(MM)的组合,基于CPE的记忆特性和递归特性,结合外部的卷积码及交织器,建立了串行级联Turbo CPM系统模型.针对短帧系统在迭代检测过程中存在的正反馈现象,设计了衰落信道下基于加权外信息交换的Turbo CPM系统接收机,有效改善了系统收敛性.探讨了不同系统参数对系统性能的影响.仿真结果表明所设计系统在衰落信道下具有优异的功率与带宽性能.The performance of coded CPM in Rayleigh fading channels is studied. Based on the decomposed model of continuous phase modulation (CPM), two separate devices, including a continuous phase encoder (CPE) and a memoryless modulator (MM) are got. Using the memory character and recursive character of CPE, combined with convolutional code and interleaver outside, the model of Turbo CPM is founded. In order to solve the problem of positive feedback during iterative detection of Turbo CPM, a receiver based on improved exchange of extrinsic information is proposed, which can improve the performance of Turbo CPM effectively. Relationships between performance and parameters of Turbo CPM are studied. Simulation results show that Turbo CPM systems designed by this paper have excellent power and bandwidth efficiency in Rayleigh fading channels.

关 键 词：CPM TURBO CPM 迭代算法 瑞利衰落 

分 类 号：TN911.22[电子电信—通信与信息系统]