Joint power allocation and relay positioning in multi-relay cooperative systems
Joint power allocation and relay positioning in multi-relay cooperative systems
复制标题
DOI：
10.1049/iet-com.2008.0738
复制
发表时间：
2009-09
期刊：
影响因子：
--
通讯作者：
X. Zhang;Y. Gong
中科院分区：
文献类型：
--
作者：
X. Zhang;Y. Gong
研究了一种双跳多中继协作中继系统。解码和转发（DF）和放大和转发（AF）协议被认为是。在不同的中继选择策略下，推导出了中断概率的闭式表达式。与二阶信道统计，作者提出联合优化功率分配（PA）和中继位置，以最大限度地减少系统中断概率。仿真结果表明，所提出的自适应分配算法明显优于固定分配算法。与建议的联合优化算法，AF中继优于DF中继时，选择多个继电器来帮助。当只选择最好的中继来帮助时，DF中继具有更好的性能。
The authors consider a dual-hop multi-relay cooperative relay system in this study. Both decode-and-forward (DF) and amplify-and-forward (AF) protocols are considered. Under different relay selection strategies, the authors derive closed-form outage probability expressions. With the second-order channel statistics, the authors propose to jointly optimise power allocation (PA) and relay positions in order to minimise the system outage probability. Simulation results show that the proposed adaptive allocation algorithms significantly outperform fixed allocation algorithms. With the proposed joint optimisation algorithm, AF relaying outperforms DF relaying when multiple relays are selected to help. When only the best relay is selected to help, DF relaying is shown to have better performance.