摘要
分层调制(hierarchical modulation,HM)是一种根据发送信号的相对重要性对数据流进行不相等保护的关键技术。针对低密度奇偶校验(low-density parity-check,LDPC)信道编码的双向中继信道,提出了一种联合分层调制和比特交织编码调制(bit-interleaved coded modulation,BICM)的物理层网络编码(physical-layer network coding,PNC)方案(HM-BICM-PNC)。推导了HM-BICM-PNC的可达速率公式,并对目前主流的分层调制映射方案进行性能分析。理论分析和仿真结果表明,映射方式和星座优先级参数λ都会影响HM-BICM-PNC可达速率和误码率性能,在不同的优先级下需选取不同的星座映射来获取系统最优性能。
Hierarchical modulation(HM)is considered as a critical technique for unequal protection of data streams based on the relative importance of the transmitted signals.A physical layer network coding(PNC)scheme,incorporating joint hierarchical modulation and bit-interleaved coded modulation(HM-BICM-PNC),is proposed for the two-way relay channel with LDPC channel coding.The achievable rate formula of the HM-BICM-PNC system is derived for the first time,and an analysis of the performance of current mainstream HM mapping schemes is conducted.Theoretical analysis and simulation results demonstrate that both the mapping schemes and constellation priority parameterλaffect the achievable rate and bit error rate performance of HM-BICM-PNC,and different constellation mappings should be selected under different priorities to obtain the optimal performance of the system.
作者
林宇晨
谢肇鹏
陈平平
LIN Yuchen;XIE Zhaopeng;CHEN Pingping(School of Physics and Information Engineering,Fuzhou University,Fuzhou 350116,P.R.China;National Local Engineering Research Center for Digital Intelligent Technology,Fuzhou 350116 P.R.China;College of Advanced Manufacturing,Fuzhou University,Quanzhou 362251,P.R.China)
出处
《重庆邮电大学学报(自然科学版)》
北大核心
2025年第3期315-323,共9页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
基金
国家自然科学基金项目(62171135)。
关键词
分层调制
双向中继信道
物理层网络编码
hierarchical modulation
two-way relay channel
physical-layer network coding
