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.
出处
《通信技术》
2007年第5期12-15,共4页
Communications Technology