Nakagami-m衰落信道下全双工解码转发中继选择策略研究

On the relay selection scheme for full-duplex DF relaying over Nakagami-m fading channels

提出一种全双工解码转发中继选择方案.不同于传统方案将信源和信宿之间直达链路视为干扰,该方案利用直达链路改善系统性能.通过研究中继和信宿节点的接收信干噪比(signal-tointerference-plus-noise ratio,SINR),推导了Nakagami-m信道下中继选择方案的中断概率确切表达式.为揭示系统参数对中断概率性能的影响,分析了高信噪比下的渐进中断概率性能.理论结果表明,本文提出的中继选择方案的分集度取决于衰落信道成型因子和中继功率伸缩方案.仿真结果表明,与传统中继选择方案相比,本文提出的方案具有更好的中断概率性能和抗自干扰能力.

This paper studies the relay selection scheme for full-duplex decode-and-forward relaying.In contrast to the traditional scheme,where the signal from a direct link is treated as interference,the proposed scheme exploits the direct link to improve performance.By investigating the signal-to-interference-plus-noise ratios（SINRs）at the relay and the destination,the exact expression of outage probability for the FDR protocol with a proposed relay selection scheme is derived in closed-form over Nakagami-m fading channels.To understand the effect of system parameters,the asymptotic outage performance in the high signal-to-noise ratio regime is analyzed.Theoretical results show that the achievable diversity of the proposed scheme depends on the shape factors of fading channels and the power scaling scheme of the relays.Moreover,simulation results show that the proposed relay selection scheme achieves better outage performance when compared with traditional schemes,and is robust to the residual self-interference caused by the full-duplex operation.