双重迭代置信传播空时编码调制及其在准静态MIMO衰落信道下的性能  

Performance of Belief Propagation Space-Time Coded Modulation with Iterative Decoding over Quasi-Stationary Fading MIMO Channel

作　　者：芮华[1] 徐大专[1] 

机构地区：[1]南京航空航天大学信息科学与技术学院,南京210016

出　　处：《南京航空航天大学学报》2005年第1期48-51,共4页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：航空科学基金 (0 3 F5 2 0 42 )资助项目 ;江苏省自然科学基金 (BK2 0 0 3 0 89)资助项目。

摘　　要：提出一种结合低密度校验码和空时分组码的置信传播编码调制方案 ,并对其在准静态 MIMO衰落信道下成对差错概率及最优星座选择进行了分析 ,并给出了相应的参考设计准则。为防止过多错误反馈造成译码失效 ,提出采用内、外双重迭代方式提高系统的鲁棒性。同时 ,由于该方案把 LDPC(Low-density parity-check)码校验矩阵作为迭代终止判决准则 ,使得迭代算法的平均复杂度降低。To combine low-density parity-check (LDPC) codes wit h space-time block codes (STBC), a scheme for belief propagation space time coded modulation with iterative decoding (BPSTCM-ID) is proposed. The pair error pro bability performance in quasi-stationary fading MIMO channel and design rules f or multiple quadrature amplitude modulation (MQAM) constellations are also analy zed. Both outer and inner iterations are used to avoid too much error feedback w hich may cause decoding failures. The scheme introduces check equations of LDPC codes to terminate both iterations, thus reducing the average decoding complexit ies. Simulation results show that the BPSTCM-ID is effective and its performanc e is better than that of the other three schemes.

关 键 词：低密度校验码 空时编码 比特交织编码调制 迭代译码 MIMO衰落信道 

分 类 号：TN911.22[电子电信—通信与信息系统]