Multi-h CPM信号的低复杂度软判决算法  

Low complexity soft-decision algorithm for Multi-h CPM

作　　者：王鹏[1] 吴岭[2] 谷源涛[1] 梅顺良[1] 

机构地区：[1]清华大学电子工程系微波与数字通信国家重点实验室,北京100084 [2]北京跟踪与通信技术研究所,北京100094

出　　处：《中南大学学报（自然科学版）》2013年第12期4869-4873,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(U0835003)

摘　　要：为提高带宽利用率与译码性能,提出一种Multi-h CPM信号的低复杂度软判决算法(LC-SOVA for MHPM),通过将判决符号处所汇聚的2条相位路径的累积度量值之差作为软判决值,以代替已有的二进制硬判决值。仿真结果表明:利用所提出的软判决值可以提高与信道编码级联后的抗误码性能,而不增加额外的计算复杂度。当信道编码采用码率为0.5的Turbo码,调制指数h分别为[8/13 9/13 10/13]与[2/4 3/4]时,误码率为10-5下的软判决编码增益分别可达0.7 dB与0.5 dB。在误码率为10-1的恶劣信道下均可获得约0.3 dB的编码增益。In order to improve the bandwidth utilization efficiency and the decoding performance, a novel low complexity soft-output viterbi algorithm for Multi-h CPM （LC-SOVA for MHPM） is proposed to replace the traditional binary hard-output value with the soft-output value, which is the difference of the metric value of the two converging phase paths for the current symbol. Simulation results show that the proposed LC-SOVA can improve the BER performance and incur no extra complexity compared with the hard-decision algorithms. Specifically, when parameter h is [8/13 9/13 10/13] and [2/4 3/4] with Turbo code of rate 0.5, the performance gain for BER of 10-5 can be improved by 0.7 dB and 0.5 dB, respectively. LC-SOVA still has performance gain of 0.3 dB for BER of 10^-1.

关 键 词：Multi-h CPM 软判决 似然值 维特比算法 信道编码 

分 类 号：TN92[电子电信—通信与信息系统]