毫米波大规模MIMO中基于部分连接的混合预编码方案  

Hybrid precoding with sub-connected architecture for millimeter wave massive MIMO system

作　　者：曹海燕[1] 杨晓慧 胡文娟 马子昌 许方敏[1] 方昕[1] CAO Haiyan;YANG Xiaohui;HU Wenjuan;MA Zichang;XU Fangmin;FANG Xin(Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学,浙江杭州310018

出　　处：《电信科学》2020年第2期35-42,共8页Telecommunications Science

基　　金：国家自然基金资助项目(No.61501158)。

摘　　要：针对发送端为部分连接、接收端为全数字接收的毫米波大规模MIMO系统,提出了一种采用等效信道的奇异值分解(SVD)设计数字预编码矩阵与数字合并矩阵,并根据模拟预编码矩阵的块对角化特性,以系统可达和速率最大化为目标函数将等效信道分块求得最优模拟预编码矩阵的预编码方案。考虑本方案的硬件成本与功耗问题,在此基础上进一步提出接收端为部分连接的预编码方案,并利用迭代交替更新的方法来求模拟预编码矩阵和模拟合并矩阵。仿真结果表明,接收端采用全数字接收的混合预编码方案相较于基于可持续干扰消除法(SIC)的混合预编码方案性能更优,而接收端采用部分连接的方案虽然性能略低于基于SIC的方案,但功耗与硬件成本大幅度降低。A hybrid precoding scheme in the millimeter wave massive MIMO system was proposed with sub-connected architecture at the transmitter and digital combining at the receiver. In this scheme, the digital precoder and combiner were designed based on the singular value decomposition(SVD) of the equivalent channel matrix, while the optimal analog precoder was obtained by blocking the equivalent channel to maximize spectral efficiency according to the block diagonalization. Considering the hardware cost and power consumption, the precoding scheme with sub-connected architecture at the receiver was further proposed. Otherwise, the analog precoder and combiner were iteratively updated. Simulation results show that the proposed scheme which focuses on the digital combining at the receiver has better performance than successive interference cancelation(SIC)-based hybrid precoding. In addition, though the proposed scheme which focuses on the hybrid combining with sub-connected architecture at the receiver has worse performance than SIC-based hybrid precoding, the power consumption and hardware cost are greatly reduced.

关 键 词：毫米波 大规模MIMO 混合预编码 块对角化 

分 类 号：TN929.53[电子电信—通信与信息系统]