基于反馈重传的网络信道编码多播研究

在无线网络中,采用现用机制(ARQ)带宽利用率并不是很高。针对这种情况,提出了一种将网络编码思想融入到重传机制中的方式———NC-ARQ,来提高单跳无线网络(例如WiMAX、WLAN等)的带宽利用率。此外,高误比特率下,在NC-ARQ基础上将网络编码与信道编码结合,即NC-HARQ,可以进一步改善无线网络的带宽利用率。分析了在传统反馈重传机制和信道编码中加入网络编码后,多播网络带宽利用率的增益。理论和仿真都证明了加入网络编码后,反馈重传机制的带宽利用率能得到较大改善。

Network-channel Coding Based on Retransmission for Multicast Scenario

The traditional mechanism(ARQ)doesn't perform well in wireless network as it leads to lower bandwidth efficiency.In this paper,a new Technique called NC-ARQ which combines the network coding concept with the traditional ARQ protocol is proposed to increase the bandwidth efficiency in single-hop wireless network such as WiMAX and WLAN.However,when under a large BER,the bandwidth efficiency of NC-ARQ cannot meet the requirement,so an advanced approach called NC-HARQ,which combining networking coding and channel coding,is proposed.Analysis about the joint network and channel coding technique in wireless network for multicast scenario is presented in this paper,and both theoretical and simulation results confirm that the proposed technique can improve the bandwidth usage