Turbo-CPM系统迭代检测收敛性的研究  

Research on the Convergence of Iterative Detection in Turbo-CPM System

作　　者：薛睿[1] 赵旦峰[1] 朱铁林[1] 

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

出　　处：《计算机仿真》2009年第6期141-145,共5页Computer Simulation

基　　金："十一.五"国防预研基金项目(xxxx607010102)

摘　　要：根据连续相位调制(CPM)的分解模型,CPM调制可以分解为连续相位编码(CPE)和无记忆调制(MM),基于CPE的记忆和递归特性,结合外部的Turbo码及交织器,建立了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,设计了一种基于加权外信息交换的迭代检测接收机。理论分析与仿真结果表明:在低信噪比条件下,所设计的接收机不仅能够有效地抑制系统中存在的正反馈现象,改善系统的收敛性,提高系统的误比特率性能,而且减少了平均迭代次数,提高了系统的实时性。Based on the decomposed model of continuous phase modulation （CPM）, CPM is divided into a continuous phase encoder （CPE） and a memoryless modulator （MM）. Using the memory and recursive character of CPE, combined with turbo code and interleaver outside, the model of Turbo - CPM system is founded. In order to solve the problem of positive feedback during iterative detection with short block information, a receiver based on weighed extrinsic information exchange is proposed. Theoretic analysis and simulation results show that the proposed receiver can not only decrease positive feedback and improve the performance of bit error rate under the condition of low SNR, but also reduce the average number of iteration and improve the character of real - time.

关 键 词：连续相位调制 收敛性 迭代检测 

分 类 号：TN911[电子电信—通信与信息系统]