一种简化的多阶段译码结构  

A simplified structure for multistage decoding

作　　者：袁东风[1,2] 张彭[1] 王倩[1] 赵峰[3] 

机构地区：[1]山东大学信息科学与工程学院 [2]东南大学移动通信国家重点实验室,江苏南京210096 [3]桂林电子工业学院

出　　处：《通信学报》2003年第5期29-36,共8页Journal on Communications

摘　　要：通过分析MSD和PDL两种译码方法在等价调制容量计算上的异同点及其与映射方法之间的关系,提出了几种新的针对8PSK和16QAM的信号星座映射图,按此进行映射设计,可以将MSD译码结构部分地用并行结构来实现,从而简化了系统的译码算法,降低了系统的译码时延。仿真结果表明:改进的MSD结构不会带来系统在性能上的损失,相反在低信噪比情况下,由于错误传播现象的消除而使系统的性能有所提高,结果可直接推广到其它高维MPSK和MQAM信号空间。Two different decoding methods MSD and PDL are analyzed and compared. According to the relationship between the decoding structure of MSD and the mapping rules for modulation signals a new mapping rule for 8PSK and 16QAM are proposed, with which MSD structure can be simplified by using some parallel levels, which can greatly decrease the time delay and complexity of the MLC system. The simulation results show that the new MSD structure proposed doesn抰 loss any performance compared with traditional optimal mapping rules, furthermore the system performance would be improved at low SNR because the error propagation is avoided by using some parallel decoding structures. The generalization for other higher MPSK and MQAM signal constellations is straightforward.

关 键 词：多层编码 多阶段译码 并行译码 映射 MSD MPSK MQAM PDL 等价调制容量 

分 类 号：TN911.2[电子电信—通信与信息系统]