Abstract: The paper studies the case that the download time or download success rate gain brought by random network coding，compared to store-and-forward mechanism，on the file-sharing program and the impact of Bit Error Ratio（BER） on random network coding’s performance in a collision-based wireless Mesh network.The simulation results show that，in the Blind-Forward node collaborative manner，when the number of source node is 1 and source node is randomly placed，random network coding can make download time reduce 30% to 40%.Furthermore，when the number of source node increases to 2，and the source nodes is placed fixedly，in both Blind-Forward and Selective-Forward node collaborative manners，compared to store-and-forward mechanism，the random network coding is greater extent in reducing download time.

摘要： 研究了在有冲突的无线Mesh网络中，相对于存储转发机制，随机网络编码对文件共享所带来的下载时间或下载成功率的增益，以及比特错误概率（Bit Error Ratio，BER）对随机网络编码性能的影响.仿真结果表明，当源节点数为1且随机放置时，在盲转发（Blind-Forward）节点协作方式下，随机网络编码能够将下载时间减少30%～40%。当源节点数为2且固定放置时，相对存储转发机制，在盲转发和选择性转发（Selective-Forward）节点协作方式下，采用随机网络编码均较大程度地减少了下载时间。