基于符号映射的物理层网络编码

摘要

从信号角度出发对物理层网络编码（physical layer network coding，PLNC）展开研究，联系实际通信中用户选择调制方式以及用户发送功率分配的差异性，重点对中继节点叠加信号的符号映射方面进行了分析讨论。通过符号映射后的星座映射图分析了中继节点的误符号率（symbol error rate，SER），并结合星型协作网络以瑞利信道为信道模型对中断性能进行了分析比较。理论分析与仿真结果表明不同的调制方式以及用户功率分配对中继误符号率有一定影响，同时基于符号映射分析的物理层网络编码的中断性能优于其他几种传输方式。%This paper study on physical layer network coding (PLNC)and focus on the analysis of symbol mapping of relay node superposition signal,contacting with user modulation types and power allocation in prac-tical communications.Based on the constellation map of symbol mapping,the symbol error rata (SER)of relay node is analyzed.Furthermore,considering the rayleigh channel as channel model with star-type network,the outage probability is analyzed and compared.Theoretical analysis and simulation results show that different modulation types and power allocation have a certain effect on relay node SER,and outage probability based on symbol mapping with network coding is outperform other transmission style.