基于无线帧的物理层网络编码同步误差性能

Performance of physical-layer network coding under different error conditions

物理层网络编码充分利用无线信道的广播特性,能够有效提高网络吞吐量和带宽利用率。但是物理层网络编码的性能受到载波相位、载波频率、时间、采样钟不同步的影响,因此分析同步误差对物理层网络编码性能影响具有重要的研究意义。基于单载波系统,针对使用BPSK调制的无线通信系统,从理论上分析了一定帧长下,载波相位、载波频率、时间及采样时钟同步误差对系统性能的影响。分析结果表明,在载波相位和时间不同步两种情形下,物理层网络编码性能不受帧长影响;而在载波频率和采样时钟不同步两种情形下,系统性能均随帧长的增加而有所下降,其中采样时钟不同步情形受帧长影响最大。

Physical-layer network coding （PNC） takes full advantage of the broadcast property of wireless channel, and has the potential for improving network throughput and bandwidth utilization significandy. However, because the performance of PNC will be influenced by carrier phase, carrier frequency, time and sampling clock, analysis of the effect of synchronization errors has fatal research significance. This paper analyzed the performance of PNC with certain frame length under carrier phase synchronization errors, carrier frequency synchronization errors, time synchronization errors and sampling clock synchronization errors by theoretical analysis, which is based on BPSK modulation. And the resuk shows that the performance of PNC will not be affected by frame length under carrier phase and time synchronization errors, while the performance will decline with the increase of frame length under carrier frequency and sampling clock synchronization errors, especially for sampling clock synchronization errors.