多中继放大转发协作通信中的中继数量与位置的联合优化

Joint optimization of the number of relay and relay node placement for amplify-and-forward multi-relay cooperative systems

本文研究了基于单用户下行遍历容量的多中继放大转发模型中中继数量与位置的联合优化问题.首先建立了单用户蜂窝中继小区协作通信模型,提出了位置-数量遍历容量.然后建立了问题优化模型,分析了位置-数量遍历容量与中继数量、中继节点位置的关系:位置-数量遍历容量随中继数量增大而增加;当中继数量给定时,位置-数量遍历容量随中继节点位置距离增大先增加后减少.最后提出了先依据容量随中继数量提升百分比的门限确定中继数量,再确定中继节点位置的方法.

This paper studies the joint optimization problem of relay number and its placement based on the performance index of downlink single-user ergodic capacity for amplify-and-forward multi-relay cooperative systems. Firstly, the model of single-user multi-relay cooperative systems is proposed, and the ergodic capacity with the number of relay and relay node placement is deduced. After that, the joint optimization problem of the number of relay and relay node placement corresponding to the ergodic capacity is given. Furthermore, we investigate the impact of relay number and relay location on the ergodic capacity： the ergodic capacity increases as the number of relay increases, and the ergodic capacity first increases to a maximum and then decreases as the distance of relay node placement increases when the number of relay is fixed. Finally, the optimal method for the joint optimization problem, first obtaining the number of relay based on the threshold of promoting capacity ratio and getting relay node placement, is presented.