非对称调制下物理层网络编码系统设计及性能分析  

Design and performance analysis of physical-layer network coding system under asymmetric modulation

作　　者：方太彬 唐猛[1] 陈庆豪 陈建华[1] 曾国峰 FANG Tai-bin;TANG Meng;CHEN Qing-hao;CHEN Jian-hua;ZENG Guo-feng(School of Information Science&Engineering,Yunnan University,Kunming 650500,Yunnan,China)

机构地区：[1]云南大学信息学院,云南昆明650500

出　　处：《云南大学学报（自然科学版）》2022年第2期246-253,共8页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金(61861045)。

摘　　要：对于非对称信道,通信系统两端采用相同调制方式发送信号时会存在误码率高、传输功率浪费等问题.针对以上问题,设计了基于非对称调制的物理层网络编码方案.首先给出方案的系统模型并制定中继节点处的解调映射规则;其次对系统在不同功率分配比下展开分析;最后在系统中引入LDPC码作为信道编码,设计相应的译码映射算法.仿真实验结果表明,在非对称信道条件下,当功率分配比优化为1时,与传统的对称调制方案相比,非对称调制方案的译码准确率提升了7.6%.For asymmetrical channels,using the same modulation method at both ends of the communication system to send signals will cause problems such as high bit error rate and waste of transmission power.In the proposed scheme,a physical layer network coding scheme based on asymmetric modulation is designed.Firstly we propose the system model of the scheme and formulate the demodulation mapping rules at the relay node.Then we analyze the system under different power allocation ratios.Finally,we introduce the LDPC code as channel coding in the system,and design the corresponding decoding mapping scheme.Numerical results show that under asymmetric channel conditions,compared with the traditional symmetric modulation scheme,the decoding accuracy of asymmetric modulation scheme is improved by 7.6%.

关 键 词：非对称调制 物理层网络编码 LDPC码 功率分配 

分 类 号：TN925[电子电信—通信与信息系统]