块衰落信道中的迭代盲信道估计与译码  

Iterative blind channel estimation and decoding over block fading channels

作　　者：赵传钢[1] 林家儒[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876

出　　处：《重庆邮电学院学报（自然科学版）》2006年第2期143-147,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(60272052);国家"863"项目(2003AA12331004)

摘　　要：提出了衰落信道下的一种迭代盲信道估计与译码算法,推导了高阶调制下的MAP估计和ML估计表达式,并证明了在信噪比充分大或块衰落信道的块长充分大时,MAP与ML估计是等价的。通过仿真发现,在对迭代信道估计与译码算法的影响上,信噪比与衰落信道的块长之间存在着折中关系,并分析了块衰落信道的块长对迭代信道估计与译码算法的性能的影响。An iterative blind channel estimation and decoding algorithm for block fading channels is proposed. MAP and ML estimation expression is derived and it proves that MAP estimation is equivalent to ML estimation when SNR or the block length of the block fading channel goes to infinity. Simulation results show that there is a tradeoff between SNR and the block length of block fading channels which determine the performance of the proposed iterative algorithm. The impact of the block length of block fading channels on performance of the proposed algorithms is analyzed.

关 键 词：低密度校验 迭代信道估计与译码 块衰落信道 BICM 

分 类 号：TN918.1[电子电信—通信与信息系统]