无线光通信编码调制的联合迭代停止方法  

The Study of Iterative Convergence and Stopping Method for a Kind of Coded Modulation in Free Space Optical Communication

作　　者：朱四华 胡昊 刘锡国 ZHU Si-hua;HU Hao;LIU Xi-guo(School of Weaponry Engineering,Naval University of Engineering,Wuhan 430033,China;Aviation Communication Teaching and Research Section,Naval Aeronautic University,Yantai 264001,China;State Key Laboratory of Signal and Information Processing of Shandong Province,Naval Aeronautic University,Yantai 264001,China)

机构地区：[1]海军工程大学兵器工程学院,武汉430033 [2]海军航空大学航空通信教研室,烟台264001 [3]海军航空大学信号与信息系统山东省重点实验室,烟台264001

出　　处：《武汉理工大学学报》2021年第9期56-62,共7页Journal of Wuhan University of Technology

基　　金：山东省“泰山学者”建设工程专项经费资助项目(ts20081330)。

摘　　要：在给出乘积编码脉冲位置调制的联合迭代解调译码结构及算法原理基础上,基于EXIT图仿真分析了系统联合迭代收敛情况,针对交叉熵简化准则无法判决收敛性的问题,提出了一种结合外信息方差与硬判决辅助停止准则的联合迭代停止方法。仿真分析表明,EXIT图准确描述了系统软解调译码迭代过程的收敛特性,所提联合停止方法可有效减少迭代次数。Based on the joint iterative demodulation decoding structure and algorithm principle of product coded pulse position modulation,the systemic joint iteration was simulated and analyzed by EXIT chart.To solve the problem that cross entropy simplification criterion can not determine convergence of the iterative system,ajoint iterative stop method combining external information variance and hard decision aided stopping criterion was proposed.The simulation results show that the EXIT chart accurately describes the convergence characteristics of the soft iterative demodulation decoding,and the proposed joint stop method can effectively reduce the number of iterations.

关 键 词：无线光通信 编码调制 软迭代 外信息转移图 停止判据 

分 类 号：E963[军事—军事通信学]