| 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。 |
| 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 |
| DOI： |
|
| 基金项目: |
|
| Performance Analysis of Asymmetric Relay System Based on Physical-layer Network Coding |
| WANG Jiang-hong,XIE Hong |
| (College of Information and Communication Engineering,Harbin Engineering Univers
ity,Harbin 150001,China) |
| Abstract: |
| Network coding which can increase bandwidth efficiency has attracted a
significant amount of attention in research community of wireless communication
s. However, when it is applied to a two-way relay channel(TWRC), it suffers fr
o
m performance degradation caused by the asymmetric position of the relay. In ord
er to remedy this problem, using hierarchical modulation at the source node is n
ecessary. By investigating how hierarchical modulation can be incorporated and o
ptimized with physical-layer network coding, the simulation results are encourag
ing in that hierarchically modulated physical-layer network coding(HMPNC) signi
ficantly improves end-to-end bit-error probability and spectral efficiency in
asymmetric relay channels, as compared with conventional modulation(CM) and as
ymmetric modulation(AM). |
| Key words: physical-layer network coding asymmetric relay hierarchical modulation two-w
ay relay channel(TWRC) |
