RIS Configuration, Beamformer Design, and Power Control in Single-Cell and Multi-Cell Wireless Networks

被引:19
作者
Buzzi, Stefano [1 ,2 ]
D'Andrea, Carmen [1 ,2 ]
Zappone, Alessio [1 ,2 ]
Fresia, Maria [3 ]
Zhang, Yong-Ping [4 ]
Feng, Shulan [4 ]
机构
[1] Univ Cassino & Southern Latium, Dept Elect & Informat Engn, I-03043 Cassino, Italy
[2] Consorzio Nazl Interuniv Telecomunicaz, I-43124 Parma, Italy
[3] Huawei Technol Duesseldorf GmbH, Wireless Terminal Chipset Technol Lab, D-80992 Munich, Germany
[4] HiSilicon Technol, Balong Solut Dept, Beijing 100077, Peoples R China
关键词
Reconfigurable intelligent surfaces; resource allocation; MIMO; multicell systems; INTELLIGENT REFLECTING SURFACE; CHANNEL ESTIMATION; MASSIVE MIMO; TRANSMISSION; FRAMEWORK; ELEMENTS;
D O I
10.1109/TCCN.2021.3068414
中图分类号
TN [电子技术、通信技术];
学科分类号
0809 ;
摘要
Reconfigurable Intelligent Surfaces (RISs) are recently attracting a wide interest due to their capability of tuning wireless propagation environments in order to increase the system performance of wireless networks. In this paper, a multiuser wireless network assisted by a RIS is studied and resource allocation algorithms are presented for several scenarios. First of all, the problem of channel estimation is considered, and an algorithm that permits separate estimation of the mobile user-to-RIS and RIS-to-base stations components is proposed. Then, for the special case of a single-user system, three possible approaches are shown in order to optimize the Signal-to-Noise Ratio with respect to the beamformer used at the base station and of the RIS phase shifts. Then, for a multiuser system with two cells, assuming channel-matched beamforming, the geometric mean of the downlink Signal-to-Interference plus Noise Ratios across users is maximized with respect to the base stations transmit powers and RIS phase shifts configurations. In this scenario, the RIS is placed at the cell-edge and some users are jointly served by two base stations to increase the system performance. Numerical results show that the proposed procedures are effective and that the RIS brings substantial performance improvements to wireless system.
引用
收藏
页码:398 / 411
页数:14
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