中继辅助的MIMO系统联合最优的功率分配研究  

Investigation on Joint Optimal Power Allocation for MIMO Systems Assisted by Relay

作　　者：李春国[1,2] 赵睿[1] 仲崇显[1] 杨绿溪[1,2] 

机构地区：[1]东南大学信息科学与工程学院,江苏南京210096 [2]东南大学水声信号处理教育部重点实验室,江苏南京210096

出　　处：《电子学报》2010年第10期2214-2218,共5页Acta Electronica Sinica

基　　金：国家973重点基础研究发展规划(No.2007CB310603);国家自然科学基金(No.61071113;No.60672093;No.60702029);国家863高技术研究发展计划(No.2007AA01Z262);国家科技重大专项(No.2009ZX03003-004)

摘　　要：本文对中继辅助的多输入多输出(MIMO)系统中信源与中继的联合最优功率分配问题进行了研究.首先,基于系统容量最大化准则提出相应代价函数,并证明了该代价函数仅仅对于部分参数是凸的,而对于全局参数是非凸的.然后,通过推导系统容量的下界,给出了一个新的代价函数,从而将非凸问题转化为一个联合凸优化问题.最后,利用凸优化方法获得了联合功率分配问题的全局最优解.计算机仿真表明,与现有方案相比,所提方案获得了更好的吞吐量性能.The joint optimal power allocation（PA） problem is investigated for the MIMO system enhanced by relay in this paper.Firstly,based on the maximization of the capacity,a cost function is formulated for the joint PA optimization,where the cost function thus obtained is proved to be only convex with respect to the partial parameters but not convex with respect to the whole parameter.Secondly,a modified cost function is obtained by derived a tight lower bound of the capacity,and thus the original nonconvex problem is converted into a convex problem.Finally,a global optimum is obtained by using the convex optimization methods for the joint power allocation problem.It is confirmed through computer simulations that the proposed PA scheme outperforms the existing method in terms of the capacity.

关 键 词：多输入多输出 中继 功率分配 凸优化 

分 类 号：TN911.5[电子电信—通信与信息系统]