提高中继辅助的MIMO系统通信可靠性的联合功率分配方法  

A joint optimal power allocation scheme for improving MIMO relay systems link reliability

作　　者：李春国[1] 仲崇显[1] 杨绿溪[1] 

机构地区：[1]东南大学信息科学与工程学院信号与信息处理专业,南京210096

出　　处：《高技术通讯》2010年第10期1020-1026,共7页Chinese High Technology Letters

基　　金：973计划(2007CB310603);国家自然科学基金(60672093,60702029);863计划(2007AA01Z262)资助项目

摘　　要：为提高中继辅助的多输入多输出(MIMO)通信系统的通信可靠性,对系统的联合功率分配问题进行了研究。首先,提出了总均方误差最小化的优化准则,并给出了相应代价函数。其次,证明了该代价函数关于部分参数是凸函数而关于全局参数是非凸函数。最后,通过推导SMSE的上界,把原来的非凸问题转换为联合的凸优化问题,从而能够使用高效的凸优化方法获得全局最优的功率分配系数。仿真结果表明所提出的功率分配方案比现有方案有更好的性能。The problem of joint power allocation in multiple-input multiple-output （MIMO） systems assisted by relay was investigated to improve the systems＇ communication reliability. Firstly, a new criterion of the sum mean squared error （SMSE） was proposed for optimization of joint power allcation, and a corresponding cost function was presented. And then, it was which is proved that the cost function is only convex with respect to the power parameters of the source or those of the relay separately, but not convex with respective to the whole parameters. Finally, the original non-convex problem was converted into a convex optimization problem by utilizing the derived upper bound of the SMSE, thus the global optimal power allocation coefficients can be obtained via the convex optimization tools with high efficiency. The simulation results indicate that the proposed power allocation scheme has the better performance compared with the existing ones.

关 键 词：多输入多输出(MIMO) 中继 联合功率分配 凸优化 

分 类 号：TN919.3[电子电信—通信与信息系统]