Hybrid CSI-RS Transmission Mechanism-Based 3D Beamforming Scheme for FDD Massive MIMO System

作     者：Fangchao Zhang Shaohui Sun Qiubin Gao Hui Li Fangchao Zhang;Shaohui Sun;Qiubin Gao;Hui Li;School of Electronic and Information Engineering, Beihang University;State Key Laboratory of Wireless Mobile Communications, China Academy of Telecommunications Technology

作者机构：School of Electronic and Information Engineering Beihang University State Key Laboratory of Wireless Mobile Communications China Academy of Telecommunications Technology 

出 版 物：《China Communications》 (中国通信（英文版）)

年 卷 期：2016年第13卷第S2期

页      面：109-119页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 0839[工学-网络空间安全] 08[工学] 081001[工学-通信与信息系统] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：massive MIMO 3D beamforming CSI-RS codebook feedback PMI 

摘      要：Massive multiple-input multipleoutput(MIMO) refers to the idea that equipping base station(BS) with a large number of antenna elements,and features the ability of three dimensional(3D) beamforming technique to enable improvement in system *** prior works on massive MIMO generally rely on a common assumption of the whole channel characteristics are perfectly known at both user equipment(UE) and BS,however,this is quite difficult to realize in practical frequency division duplexing(FDD) system since the channel state information reference signal(CSIRS) overhead and CSI feedback overhead are proportional to the number of antenna *** this paper,two hybrid CSI-RS transmission mechanism-based 3D beamforming schemes are proposed in FDD massive MIMO system,in which non-beamformed CSI-RS configuration is utilized in conjunction with beamformed CSIRS *** the proposed schemes,an angle quantization-based vertical codebook and a DFT-based horizontal codebook are designed,respectively,and an eigenvalue decompositionbased precoding matrix indicator(PMI)selection algorithm is also proposed for CSI *** results show that the proposed 3D beamforming schemes achieve significant improvement in system capacity without incurring excessive CSI-RS overhead.