一种选择发送的协作网络编码及其性能分析

Performance Analysis of a Cooperative Network Coding Based on Selective Transmission

摘要: 衰落环境中，自动重传技术是实现错误处理、完成数据传输的有效方法之一。本文提出了一种选择发送的协作网络编码（Cooperative Network Coding based on Selective Transmission,STCNC），该技术在数据重传过程中，将空时协同发送与网络编码技术相结合，可以有效减少重传次数，提高网络资源利用率。针对一发两收系统，单个中继节点辅助传输的情形，分析了STCNC的中断性能和网络编码增益，结果表明：相对于传统的广播策略，选择发送的协作网络编码可以获得2阶分集增益；此外，在中低信噪比区域，STCNC同时可以获得明显的网络编码增益。

Abstract: Automatic retransmission is one of effective approaches to ensure the error correction and achieve data transmission over Fading Channels.A cooperative network coding based on selective transmission (STCNC) is proposed,which can effectively reduce the average number of retransmissions and improves resource efficiency.Focusing on the system with one source node,single relay nodes and two destination node,outage performance and network coding gain of STCNC are analyzed.The results show that in contrast to traditional broadcast strategy,secondorder diversity is achieved through STCNC.And in the low and middle signaltosignal ratio (SNR) regime,a superior network coding gain is achieved simultaneity.