| 摘要: |
| 模数混合预编码是大规模多输入多输出(Multiple-Input Multiple-Output,MIMO)系统下行传输的一种有效方式。针对部分连接结构的多用户混合预编码系统的模拟预编码环节提出了最大化用户子阵列增益的用户和子阵列匹配准则，据此提取每个用户对应子阵列的信道相位信息生成该用户的模拟预编码向量，进而构造具有块稀疏结构的模拟预编码矩阵；然后，对等效信道实施数字迫零预编码。仿真表明，相较于传统基于固定匹配准则的混合预编码，基于所提匹配准则的混合预编码在略微增加计算复杂度的前提下能显著提升系统的和频谱效率。 |
| 关键词: 大规模MIMO 混合预编码 部分连接结构 子阵列增益 |
| DOI： |
|
| 基金项目:四川省重点研发项目(2021YFG0151，2020YFS0507) |
|
| Hybrid precoding with maximizing subarray gain for multiuser massive MIMO systems |
| ZHANG Lei,GAO Junfeng,XIANG Bo |
| (School of Electronic Information and Electrical Engineering,Chengdu University,Chengdu 610106,China) |
| Abstract: |
| Analog-digital hybrid precoding is an effective method for downlink transmission in massive multiple-input multiple-output(MIMO) systems.In this paper,given partially-connected multi-user hybrid precoding systems,a matching criterion between users and subarrays is proposed to maximize users’ subarray gains at the analog precoding stage.Accordingly,the channel phase information of the matched subarray is extracted to generate the analog precoding vectors of the corresponding user and further construct the total analog precoding matrix with block sparse structure.Then,a digital zero-forcing precoding is applied to the equivalent channel.Simulation results show that compared with the hybrid precoding based on the fixed matching criterion,the one based on the proposed matching criterion can significantly improve the sum spectrum efficiency of the system while slightly increasing the computational complexity. |
| Key words: massive MIMO hybrid precoding partially-connected structure subarray gain |
《电讯技术》编辑部 