具有单缓冲区的协同GBN-ARQ算法

Cooperative GBN-ARQ with a single buffer

提出了一种具有单缓冲区的协同回退N自动重传请求(Go-Back-N Automatic Repeat Request,GBN-ARQ)算法,该算法适用于基于多址传送的单源单中继无线通信系统.利用多址系统允许多个节点同时发送数据的特点,在接收端加入一个缓冲区,使得中继和数据源可同时参与数据帧的发送及重发过程,有效提升了系统的首发成功率和重发成功率,解决了传统GBN-ARQ算法在信道条件较差时系统吞吐率性能快速下降的问题.以TDMA系统为例,经过理论分析和系统仿真,证明了该算法在保持原有GBN-ARQ算法复杂度基本不变的情况下,提升了系统的吞吐率性能,增益最大超过10dB.

This paper presents a Cooperative Go-Back-N Automatic Repeat Request Algorithm with a Single Buffer （SBC-GBN-ARQ）, which can be applied to the multi-access based single source single relay wireless networks. Adding one single buffer at the destination by virtue of the characteristic of a multiple access system（e, g. TDMA or CDMA）, the scheme enables both the source and the relay to participate in the first transmission and the retransmission process of packets, which makes the system yield a much hetter throughput performance than GBN-ARQ algorithm. It can overcome the drawback of the conventional algorithm that its data throughput will sharply drop down when the channel condition is getting poorer. Numerical analysis and computer simulation show that the proposed algorithm significantly outperforms the conventional one in throughput efficiency, and that the maximum gain is over 10 dB under some conditions.