多用户MIMO系统中基于单天线功率约束的功率分配方法  

Power allocation under per-antenna power constraints in multiuser MIMO systems

作　　者：韩圣千[1] 杨晨阳[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《通信学报》2012年第10期71-76,85,共7页Journal on Communications

基　　金：新一代宽带无线移动通信网科技重大专项基金资助项目(2011ZX03003-001);中国博士后科学基金资助项目(20110490271)~~

摘　　要：针对多用户多输入多输出(MIMO)系统,研究了单天线功率约束下的低复杂度功率分配方法。基于迫零预编码算法,通过理论分析指出,在单天线功率约束下使多用户和数据率最大化的最优功率分配具有多水平面灌水结构,由此证明了单天线功率约束与多天线加权和功率约束之间的等价关系,并提出了一种低复杂度功率分配方法。仿真结果表明,所提出的功率分配方法的性能优于现有的等功率分配和启发式方法,与最优功率分配方法相比,能够以很小的性能损失为代价有效地降低计算复杂度。A low-complexity power allocation algorithm was investigated under per-antenna power constraints （PAPC） in multiuser multiple-input multiple-output （MIMO） systems. It was shown that the optimal power allocation subject to PAPC, aimed at maximizing the sum rate of multiple users with zero forcing （ZF） precoders, had the structure of wa- ter-filling with multiple water-levels. Based on this result, the equivalence between PAPC and weighted sum power con- straints was proved and a low-complexity suboptimal power allocation method was then proposed. Simulation results show that the proposed method outperforms the existing equal power allocation method and the heuristic method, and it can efficiently reduce the computational complexity with a negligible performance loss compared with the optimal power allocation method.

关 键 词：多用户MIMO系统 单天线功率约束 功率分配 迫零预编码 

分 类 号：TN914[电子电信—通信与信息系统]