一种下行多用户MIMO系统中的鲁棒波束形成算法  

An Algorithm of Robust Beamforming in the Downlink Multiuser MIMO System

作　　者：孙昕[1] 张钦[1] 马鹏飞[2] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]中国电子科技集团公司第54研究所,河北石家庄050081

出　　处：《电子学报》2009年第3期444-448,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60572036,50534060);国家“863”计划(No.2007AA01Z259)

摘　　要：提出了一种下行多用户MIMO系统中的鲁棒性线性处理算法.该算法利用了信道均值和天线相关矩阵等信道统计信息,在总发射功率不大于目标值的约束条件下,能够使所有用户的均方误差(total mean square error,TMSE)在随机信道上的平均值最小.该算法不明显依赖瞬时信道信息(channel state information,CSI),当信道估计得到的CSI不准确时,它能够有效降低由CSI偏差带来的性能损失.仿真结果表明提出的算法能够有效地降低由于不准确CSI带来的误码率和平均MSE的损失.An algorithm of robust linear processing for the downlink multiuser MIMO system with imperfect known CSI is proposed. This algorithm uses stable channel statistics information about the channel mean and antenna correlation, to minimize the average value of the all user＇ s total mean squared error over stochastic channel under the transmitter sum power constraint. This algorithm does not exactly depend on instantaneous channel information, when CSI obtained by channel estimation is not perfect, the performance loss due to the CSI mismatch can be efficiently reduced. Simulation results demonstrate that the proposed algorithm effectively ameliorate the BER and average MSE due to the CSI mismatch.

关 键 词：多用户MIMO 下行链路 鲁棒性 不准确CSI 

分 类 号：TN929.5[电子电信—通信与信息系统]