LDPC-COFDM无线通信系统译码算法研究  

Research on Decoding Algorithm for LDPC-COFDM Wireless Communication System

作　　者：贾向东[1] 欧阳玉花[2] 谢伟[3] 

机构地区：[1]西北师范大学数学与信息工程学院,甘肃兰州730070 [2]兰州交通大学数理与软件工程学院,甘肃兰州730070 [3]安徽大学电子科学与技术学院,安徽合肥230039

出　　处：《通信技术》2007年第5期12-15,共4页Communications Technology

摘　　要：对MQAM调制的LDPC-COFDM无线通信系统及其译码算法进行了研究,提出了一种基于部分接收符号硬判决的距离译码算法。该算法首先对接收符号星座图中特别奇异点进行硬判决"校正",然后利用接收符号和译码判决符号在星座图中的距离,在每次迭代前计算符号的伪似然比,作为下次迭代的伪初始信息。仿真分析结果表明,在多径信道模型中,该算法具有良好的性能,是有效的。In this paper, the LDPC-COFDM wireless communication system with MQAM and its decoding algorithm are studied. An effective algorithm is proposed, which is based on hard-decision for some specially received symbols far away from normal symbols on the constellation. Then according to the distance between received symbols and decoded symbols, the pseudo Log-Likelihood-Ratio（LLR） is calculated, and taken as the pseudo initialization information for the next iteration. Simulation results indicate that this system is of good performance in the multipath channel model and the algorithm is effective.

关 键 词：LDPC码 OFDM系统 部分接收符号 硬判决 距离译码算法 

分 类 号：TN911.22[电子电信—通信与信息系统]