对称信道下的混合前传协作通信方案

Hybrid Forwarding Scheme for Cooperative Communication in Symmetric Wireless Networks

为了降低协作通信的中断概率,提出了一种对称信道下的混合前传协作通信方案.该方案中,各中继节点根据源到中继的瞬时链路状态决定采用解码转发(DF)或放大转发(AF)协议进行协作通信,从而不同的中继节点可能采用不同的协议进行协作通信.推导了混合前传协作通信方案中断概率的算术表达式,并将混合前传协作通信方案与传统的DF协作方案和AF协作方案进行仿真比较,结果表明,混合前传协作方案能有效减小通信系统的中断概率.

In order to reduce the outage probability of cooperative communication, a hybrid forwarding scheme for cooperative communication system in symmetric wireless networks is proposed. In this scheme, each relay is decided to use either ＂ amplify and forward （AF）＂ or ＂ decode and forward （DF）＂ according to the instantaneous signal to noise ratio conditions between the source and the relay. Thus, the different relay nodes may use different communication protocols to carry out cooperative communication. An expression of the average outage probability on the hybrid forwarding scheme is derived. Furthermore, the simulation shows that the proposed hybrid forwarding scheme outperforms conventional cooperative relaying with AF and DF in reducing the outage probability.