高速率的符号干扰传输及其编码的检测译码  

Research on the High Symbol Rate ISI Transmission and the Detection/Decoding Algorithm of the Coded ISI System

作　　者：张曦林[1] 刘海涛[2] 李道本[1] 

机构地区：[1]北京邮电大学信息处理与智能技术重点实验室,北京100876 [2]中国民航大学通信工程系,天津300300

出　　处：《北京邮电大学学报》2007年第6期60-64,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(90604035)

摘　　要：研究了高符号速率传输造成的符号干扰在接收端采用最大似然序列检测算法的性能,与相同频谱效率下的正交幅度调制(QAM)无符号干扰系统性能比较的结果是,高符号速率的符号干扰传输方案随着频谱效率的提高显示出性能优势.提出了信道编码的符号间干扰传输的最佳检测译码算法,即在接收信号检测和信道译码之间采用最大后验概率准则下的软入软出迭代检测译码.仿真结果表明,本算法充分利用了符号干扰信道自然形成的编码约束关系,获得了最大编码增益.The performance of the high symbol rate intersymbol interference （ISI） transmission with maximum likelihood sequence detection （MLSD） Utilized at receiver is researched. Compared with the Mary-quadrature amplitude modulation （M-QAM） non-ISI system that has the same spectral efficiency, the bit error rate performance of the ISI system outperforms gradually with the spectral efficiency increasing. The optimal algorithm of the coded ISI system is proposed that is iteratively soft-in soft-out joint detection and decoding under maximum a posterior （MAP） criterion. Simulation shows that optimal algorithm obtains the optimal coding gain for it fully utilizing the encoding constraints formed by ISI.

关 键 词：符号间干扰 最大似然序列检测 最大后验概率准则 软入软出 迭代译码 

分 类 号：TN929.53[电子电信—通信与信息系统]