基于物理层网络编码的非对称中继系统性能分析  

Performance Analysis of Asymmetric Relay System Based on Physical-layer Network Coding

作　　者：王江洪[1] 谢红[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,哈尔滨150001

出　　处：《电讯技术》2011年第12期14-19,共6页Telecommunication Engineering

摘　　要：在无线通信研究中,网络编码因其可有效提升带宽利用率的特性得到了大量关注。但是,网络编码用于双向中继信道(TWRC)时,中继位置的不对称将造成系统性能的下降,故在源节点使用分层调制的方法来解决此问题。研究了分层调制和物理层网络编码的联合以及优化,并进行了系统仿真。仿真结果显示,在非对称中继信道下,通过与传统调制方案(CM)和非对称调制方案(AM)进行性能对比,分层调制物理层网络编码(HMPNC)能够极大地改善端到端误比特率以及频谱效率。Network coding which can increase bandwidth efficiency has attracted a significant amount of attention in research community of wireless communications. However, when it is applied to a two-way relay channel （TWRC）, it suffers from performance degradation caused by the asymmetric position of the relay. In order to remedy this problem, using hierarchical modulation at the source node is necessary. By investigating how hierarchical modulation can be incorporated and optimized with physical- layer network coding, the simulation results are encouraging in that hierarchically modulated physical - layer network coding（HMPNC） significantly improves end-to-end bit-error probability and spectral efficiency in asymmetric relay channels, as compared with conventional modulation（CM） and asynanetric modulation （AM）.

关 键 词：物理层网络编码 非对称中继 分层调制 双向中继信道 

分 类 号：TN925[电子电信—通信与信息系统]