统计和瞬时CSI混合的3D MIMO预编码

本文针对分别具有统计信道状态信息（Channel State Information，CSI）和瞬时CSI的用户，研究了两类用户在三维多输入多输出（Three-Dimension Multiple-Input Multiple-Output，3D MIMO）系统中的下行链路传输模式，解决了混合利用统计和瞬时CSI的下行预编码的设计问题。利用3D MIMO信道的克罗内克积的性质，提出了一种用于最小化基站总发射功率的扩展迫零预编码的方法，并分别求解其最优水平预编码矩阵和最优垂直预编码矩阵。仿真结果表明，该方案具有更低的复杂度和良好的速率。 

3D MIMO Precoding with Mixed Statistical and Instantaneous CSI

In this paper,we study the downlink transmission mode in the three-dimension multiple-input multiple-output(3D MIMO) system for users with statistical channel state information(CSI) and instantaneous CSI.The design problem of downlink precoding for mixed utilization statistics and instantaneous CSI is solved.Based on the properties of the Kronecker product of 3D MIMO channel,an extended zero-forcing precoding method for minimizing the total transmit power of the base station is proposed,and the optimal horizontal precoding matrix and optimal vertical precoding matrix are solved respectively.Compared to 2D MIMO scheme and zero-forcing precoding scheme,the scheme has lower complexity and good rate.