大规模MIMO系统中基于3D码本的多用户预编码方案

摘要

For the co-channel interference in large-scale Multiple Input Multiple Output(MIMO) systems,this paper proposes a multiuser precoding scheme based on 3D codebooks.On the basis of uniform planar array antennas,the vertical codebook is designed by the distribution characteristics of vertical declivitous angle,and the existing Discrete Fourier Transform(DFT) codebook is used as the horizontal codebook.3D codebooks based on the Kronecker product operation are reconstructed.Codeword selection and user scheduling strategy are combined to minimize the multiuser interference in the large-scale MIMO system.Simulation results show that,compared with the 3D-DFT codebook precoding scheme,the proposed scheme can more accurately distinguish the differences of the vertical channel information,and hence effectively suppress multiuser interference and improve system rate significantly.%针对大规模多输入多输出(MIMO)系统存在的共信道干扰问题,提出一种基于3D码本的多用户预编码方案.以均匀平面阵列天线为基础,利用垂直下倾角的分布特点设计垂直码本,并将现有的离散傅里叶变换码本作为水平码本,基于Kronecker积运算重新构造3D码本.结合码字选择和用户调度策略,最小化大规模MIMO系统中多用户的干扰.仿真结果表明,与基于3D离散傅里叶变换码本的预编码方案相比,该方案能准确区分用户在垂直维信道信息上的差异,有效抑制多用户干扰,提升系统速率.