Abstract: As the evolution of network coding, Physical layer Network Coding（PNC） can improve capacity of wireless networks by reducing the interference of wireless network nodes. The study of wireless networks capacity based on PNC under protocol interference model which not considers the impact of the global node and with the single parameter [Δ] can’t well express network environment. In order to eliminate this disadvantage, this paper proposes an evaluation method of wireless network capacity based on PNC under SINR. Through the results, it confirms that the capacity of wireless network based on PNC is better than the other coding scheme under the parameters of SINR, and gets the upper bound of wireless networks capacity and the characteristics of the capacity with different parameters.

Key words: Signal to Interference plus Noise Ratio（SINR）, Physical-layer Network Coding（PNC）, capacity increase, effect of capacity

摘要： 物理层网络编码（PNC）作为网络编码的延伸，可以通过降低无线网络节点的干扰提升无线网络的容量。在协议干扰模型下研究基于PNC无线网络的容量增益，只考虑发送节点临近的一个节点的影响，没有考虑全局节点的影响，且参数[Δ]单一、抽象，不能良好表达真实网络环境。针对这些缺点，提出一种物理干扰模型（SINR）下基于PNC的无线网络容量的评测方法。在试验仿真结果中，证实全局节点影响下PNC方案无线网络容量在SINR各参数下的性能指标优于其他编码方案，并给出所有参数下网络容量的上界以及容量上界随参数变化特性。

关键词: 物理干扰模型, 物理层网络编码, 容量增益, 容量影响特征