Outage performance of DF relay selection schemes with outdated CSI over Rayleigh fading channels
Outage performance of DF relay selection schemes with outdated CSI over Rayleigh fading channels
复制标题
瑞利衰落信道上具有过时 CSI 的 DF 中继选择方案的中断性能
DOI：
10.1049/iet-com.2017.0611
复制
发表时间：
2018-02
影响因子：
1.6
通讯作者：
Yang Guang
中科院分区：
文献类型：
--
作者：
Li Enyu;Wang Xuhu;Wu Zeju;Yang Guang
在这项研究中，作者首先提出了两个协议，即机会中继（OR）优先级和直接重传（DR）优先级，分别基于被动和主动OR选择方案。然后，他们调查了这些协议的中断性能与过时的信道状态信息（CSI），并推导出精确的封闭形式的表达式的中断概率的所有考虑的情况下的解码和转发（DF）协议的基础上。在高信号噪声比制度，作者分析了渐近中断行为。此外，基于渐近分析，导出了上述所有方案的分集阶。理论分析和仿真结果表明：（i）DR优先级的中断性能优于OR优先级;（ii）在相同的场景下，被动OR选择的中断性能优于主动OR选择;（iii）当CSI过期时，所有方案的分集阶数均降为2;（iv）在信道相关系数只有少量降低的情况下，中断性能将显著降低。
In this study, the authors first propose two protocols, namely the opportunistic relay (OR) priority and the direct retransmission (DR) priority, based on the reactive and proactive OR selection schemes, respectively. Then, they investigate the outage performance of these protocols with outdated channel state information (CSI) and derive the exact closed-form expressions of the outage probabilities of all the considered scenarios based on the decode-and-forward (DF) protocol. In the high signal-to-noise ratio regime, the authors analyse the asymptotic outage behaviour. In addition, based on the asymptotic analysis, the diversity orders of all the schemes mentioned above are derived. Theoretical analysis and simulation results show that (i) the outage performance of the DR priority is better than that of the OR priority; (ii) the outage performance of the reactive OR selection is better than that of the proactive OR selection in the same scenario; (iii) the diversity orders of all the considered schemes will be reduced to 2 when the CSI is outdated; (iv) the outage performance will be decreased substantially in the case that the channel correlation coefficient has only a little reduction.