A CSI Acquisition Approach for mm Wave Massive MIMO  

作　　者：Shanzhi Chen Qiubin Gao Runhua Chen Hui Li Shaohui Sun Zhengxuan Liu 

机构地区：[1]State Key Lab of Wireless Mobile Communication,China Academy of Telecommunication Technology

出　　处：《China Communications》2019年第9期1-14,共14页中国通信（英文版）

基　　金：supported in parts by the National Natural Science Foundation of China for Distinguished Young Scholar under Grant 61425012;the National Science and Technology Major Projects for the New Generation of Broadband Wireless Communication Network under Grant 2017ZX03001014

摘　　要：Massive Multiple-Input Multiple-Output(MIMO)is considered as a key technology for 4G and 5G wireless communication systems to improve spectrum efficiency by supporting large number of concurrent users.In addition,for the target frequency band of 5G system,mmWave band,massive MIMO is pivotal in compensating the high pathloss.In this paper,we investigate the channel state information(CSI)acquisition problem for mmWave massive MIMO.With hybrid analog-digital antenna architecture,how to derive the analog beamforming and digital beamforming is studied.An iterative analog beam acquisition approach is proposed to save system overhead and reduce beam searching complexity.Regarding the digital beamforming,a grouping based codebook is proposed to facilitate CSI feedback.The codebook is then extended to incorporate also analog beam acquisition.Furthermore,channel reciprocity is exploited to save CSI reporting overhead and a two-stage approach is proposed to fully utilize the channel reciprocity at both mobile station and base station side and accelerate the CSI acquisition procedure.Massive Multiple-Input Multiple-Output(MIMO) is considered as a key technology for 4 G and 5 G wireless communication systems to improve spectrum efficiency by supporting large number of concurrent users. In addition, for the target frequency band of 5 G system, mm Wave band, massive MIMO is pivotal in compensating the high pathloss. In this paper, we investigate the channel state information(CSI) acquisition problem for mm Wave massive MIMO. With hybrid analog-digital antenna architecture, how to derive the analog beamforming and digital beamforming is studied. An iterative analog beam acquisition approach is proposed to save system overhead and reduce beam searching complexity. Regarding the digital beamforming, a grouping based codebook is proposed to facilitate CSI feedback. The codebook is then extended to incorporate also analog beam acquisition. Furthermore, channel reciprocity is exploited to save CSI reporting overhead and a two-stage approach is proposed to fully utilize the channel reciprocity at both mobile station and base station side and accelerate the CSI acquisition procedure.

关 键 词：CODEBOOK CSI ACQUISITION hybridbeamforming 

分 类 号：TN9[电子电信—信息与通信工程]