MIMO系统中一种鲁棒的特征波束成形算法  

Robust eigenmode beamforming scheme for MIMO systems

作　　者：马鹏飞[1] 赵慧[1] 王文博[1] 

机构地区：[1]北京邮电大学无线信号处理与网络实验室,北京100876

出　　处：《吉林大学学报（工学版）》2008年第5期1170-1174,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(60572120)

摘　　要：针对发射端不能获得精确瞬时信道信息的多输入多输出(MIMO)系统,提出了一种鲁棒的特征波束成形算法。当接收端使用最小均方误差准则(MMSE)检测时,检测后的MSE矩阵在高信噪比下服从逆wishart分布。用MSE矩阵均值的标量函数作为优化目标,给出了当标量函数分别是schur凸函数和schur凹函数时的赋形向量,并研究了使用几种常用的标量函数时相应的功率分配算法。仿真结果表明:当发射端获得的信道信息不准确时,提出的算法表现出比传统特征波束成形算法更低的误比特率,并且当信道信息的不确定程度变化时,提出算法的性能有很好的鲁棒性。A robust eigenmode beamforming scheme was proposed for multi-input multi-output （MIMO） systems when the instantaneous channel information is not perfectly known at transmitter. Using minimum mean square error （MMSE） criterion at receiver, the mean square error （MSE） matrix submits to inverse wishart distribution at high signal to noise ratio （SNR）. The beamforming vector was given when the objective functions were schur convex and schur concave repectively. Moreover powe4r allocation schemes were studied for some usual objective functions. Simulations show that the proposed scheme has a better performance than that of the traditional scheme when the channel information is not perfectively known at transmitter. And the scheme is obviously robust when the uncertanty of channel information changing.

关 键 词：通信技术 MIMO系统 鲁棒性 波束成形 功率分配算法 

分 类 号：TN911.22[电子电信—通信与信息系统]