编码CPM信号低复杂度联合迭代解调译码算法  

Low Complexity Joint Iterative Demodulation and Decoding Algorithm for Encoded CPM Signals

作　　者：钟凯[1] 彭华[1] 葛临东[1] 

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》2015年第6期725-730,共6页Journal of Information Engineering University

基　　金：国家自然科学基金资助项目(61072046);河南省自然科学基金资助项目(102300410008)

摘　　要：针对编码连续相位调制(CPM)信号迭代检测中存在的复杂度高以及容易出现正反馈等问题,从网格状态和迭代译码两方面对算法进行改进,提出了一种低复杂度的联合迭代解调译码算法。该算法利用基于状态分集思想减少状态序列检测(RSSD)的方法进行网格状态的化简,结合硬判决辅助(HDA)迭代停止准则来进行动态译码,减少了迭代次数,进一步降低算法复杂度。理论分析和仿真结果表明,该算法与传统算法相比,在保持良好性能的同时,可以大幅降低系统复杂度,有效抑制正反馈,减少译码时延。To solve the issues of the high complexity and positive feedback in the iterative detectionfor encoded continuous phase modulation（ CPM） signals,a novel low complexity joint iterative demodulation and decoding algorithm is proposed from the perspective of the trellis states and iterative decoding. The algorithm uses the reduced state sequence detection（ RSSD） method based on the idea of state set partitioning to reduce the numbers of trellis states. Besides,hard decision- aided（ HDA） iterative stopping criteria is combined in dynamic decoding to reduce the iterative times and the complexity further. The analysis and simulation results show that the proposed algorithm provides lower complexity and resists the positive feedback as well as reduces the iterative decoding delay compared with the traditional algorithm,while the performance almost retains the same.

关 键 词：连续相位调制 减少状态序列检测 正反馈现象 硬判决辅助 迭代译码 

分 类 号：TN927[电子电信—通信与信息系统]