基于DF-PSP的PCMA信号解调算法  

Demodulation Algorithm of PCMA Signals Based on DF-PSP

作　　者：魏雪娟[1] 杨勇[1] 郭一鸣[1] 彭华[1] 张冬玲 WEI Xuejuan;YANG Yong;GUO Yiming;PENG Hua;ZHANG Dongling(Information Engineering University,Zhengzhou 450001,China)

机构地区：[1]信息工程大学,河南郑州450001

出　　处：《信息工程大学学报》2018年第3期306-310,368,共6页Journal of Information Engineering University

基　　金：国家自然科学基金资助项目(61401511)

摘　　要：针对合作接收的高阶调制PCMA信号,提出一种基于判决反馈逐幸存路径处理(decision feedback per-survivor processing,DF-PSP)的解调算法。该算法包含2次序列估计:第1次采用传统的基于星座图的硬判决解调算法,得到有用信号的预判决序列;第2次采用PSP算法,在序列估计的过程中,将第1次的判决结果作为反馈序列,用于补偿信道截断带来的性能损失。仿真结果表明,DF-PSP算法在减少运算复杂度的同时能够有效地提升解调性能,实现复杂度和性能的良好折中。For cooperative received high-order modulation PCMA signals, a demodulation algorithm based on decision feedback per-survivor processing（DF-PSP） is proposed. The algorithm consists of two sequence estimation： first, the traditional hard-decision demodulation method based on constellation diagram is employed to obtain the preliminary decisions of useful signal; second, PSP algorithm is used. The first estimation results are used as feedback in the process of sequence estimation, in order to compensate the performance loss caused by truncated channel. Simulation results show that the DF-PSP algorithm can provide the tradeoff between complexity and performance, which can improve demodulation performance effectively while reducing the complexity.

关 键 词：PCMA 基于星座图的硬判决解调算法 判决反馈 逐幸存路径处理 

分 类 号：TN911.7[电子电信—通信与信息系统]