基于物理层网络编码的两跳中继改进方案

根据物理层网络编码可以提高无线通信系统通信效率的特点，提出一种提高无线通信系统通信效率的改进方案。该方案在物理层网络编码方案的第2阶段将PCMA思想与物理层网络编码相结合，达到通信双方不间断地交换信息的目标，使得两跳中继模型在3个单位时隙内完成2个数据帧的交换。实验结果表明，与物理层网络编码方案相比，该方案能减少信息交换的时间，通信效率提高60%。

Improved Scheme of Two Hop Relay Based on Physical-layer Network Coding

Aiming at the excellent performance that Physical-layer Network Coding(PNC) can improve the communication throughput greatly, this paper proposes a new scheme that can enhance the communicating efficiency much more. In the second stage of the PNC, the scheme uses the idea of PCMA to resolve the problem that the nodes only wait for receiving message and do not sent message to the relay station. Based on the new scheme, the two nodes exchange the messages continuously, and receive two data frames in three slots. Experimental results show that the improved scheme can reduce messages exchange time and enhance the performance by 60%, campared with other schemes of PNC.