协方差反馈时空时编码系统的线性预编码设计  

Optimal design of linear precoder in space-time coded system with covariance feedback

作　　者：赵振山[1,2] 徐国治[3] 

机构地区：[1]普天信息技术研究院有限公司,北京100080 [2]北京邮电大学,北京100876 [3]上海交通大学,上海200240

出　　处：《电路与系统学报》2010年第2期13-16,共4页Journal of Circuits and Systems

摘　　要：本文讨论了在空间相关的多输入-多输出(MIMO)系统中利用发射端已知的信道协方差矩阵最优设计线性预编码矩阵的问题。推导出最优的预编码矩阵的方向与发射相关矩阵和空时编码的结构相关,而最优的功率分配方案与发射相关矩阵、接收相关矩阵和空时编码都相关。仿真结果表明本文推导出的最优功率分配方案的性能优于平均功率分配和单方向波束形成方案。This paper develops the optimal linear precoder to exploit channel covariance matrix at the transmitter in a correlated multiple-input multiple-output （MIMO） wireless system. The optimal beamforming direction of the precoder is proved to match the structure of space-time code （STC） and transmission correlation matrix. The optimal power allocation scheme is related to transmit correlation matrix, receive correlation matrix and STC. Simulation results show that the performance of optimal power allocation scheme is better than that of equal power allocation and 1-D beamforming.

关 键 词：空时编码 协方差反馈 线性预编码 

分 类 号：TN929.5[电子电信—通信与信息系统]