基于可变长纠错码和掺杂调制的联合信源信道编码调制方法  

Joint Source-Channel Code Modulation Scheme Based on Variable-length Error-Correct Code and Doping Modulation

作　　者：包涵 凃国防 张灿 高绍帅 陈德元 BAO Han;TU Guofang;ZHANG Can;GAO Shaoshuai;CHEN Deyuan(The High Technology Research Institute of Wei Qiao,USCAS,Beijing 101408,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 101408,China)

机构地区：[1]魏桥国科大高等技术研究院,北京101408 [2]中国科学院大学电子电气与通信工程学院,北京101408

出　　处：《电子与信息学报》2023年第6期2045-2053,共9页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61571416,61271282);中国科学院奖励基金(2017-6-17)。

摘　　要：针对无线通信中存在的频谱资源有限、信道衰落和多径效应等问题,该文将可变长纠错(VLEC)编码和掺杂调制相结合,提出一种新的联合信源信道编码调制方法。该方法利用外信息转移(EXIT)图分析系统的迭代译码特性,优化设计可变长纠错编码和掺杂调制的参数。主要包括:(1)设计有更大自由距离的可变长码,使其具有纠错能力;(2)设计优化掺杂调制的掺杂和映射规则的方法,使掺杂调制EXIT曲线与可变长纠错编码EXIT曲线匹配,降低迭代译码收敛所需的信噪比(SNR)。仿真结果表明,在AWGN信道和瑞利衰落信道下,该联合信源信道编码调制方法与分离的信源信道编码调制方相比,迭代收敛所需的信噪比减小了1 dB以上,相比其他的联合信源信道编码调制方法,也有更好的误码率性能。在误码率为10–4时,该方法距离AWGN信道和瑞利衰落信道的香农限分别为0.7 dB和1.0 dB。To deal with effects of limited spectrum,fading and multipath during wireless communication,a new joint source-channel code modulation scheme is proposed.This scheme consists of a Variable-Length Error-Correct(VLEC)code and doping modulation.With the aid of EXtrinsic Information Transfer(EXIT)chart analysis for the iterative decoding characteristics,the parameters of VLEC and doping modulation are designed.The design includes:(1)a variable-length code with large free distance is constructed to provide error correction capability;(2)the doping code and mapping of modulation are optimized to make the EXIT curve of doping modulation match with the EXIT curve of VLEC,and hence the Signal-to-Noise Ratio(SNR)required for iterative decoding convergence is reduced.Simulation results show that over AWGN channel and Rayleigh fading channel,the proposed scheme has more than 1 dB SNR gains compared with the separated sourcechannel code modulation and has the best performance compared with other joint source-channel code modulation schemes.Also,at the symbol error rate of 10-4,the performance of the proposed system is 0.7 dB and 1.0 dB away from the Shannon limit,respectively.

关 键 词：联合信源信道编码 掺杂调制 迭代译码 外信息转移图 

分 类 号：TN911.3[电子电信—通信与信息系统]