On the Design of Broadbeam of Reconfigurable Intelligent Surface

被引:0
作者
Lin, Xinyi [1 ]
Zhang, Lei [1 ]
Tukmanov, Anvar [2 ]
Liu, Yihong [3 ]
Abbasi, Qammer H. [1 ]
Imran, Muhammad Ali [1 ]
机构
[1] Univ Glasgow, Sch Engn, Glasgow City G12 8QQ, Scotland
[2] British Telecommun PLC, Adastral Pk, Ipswich IP5 3RE, England
[3] Tsinghua Univ, Dept Automat, Beijing 100190, Peoples R China
基金
英国工程与自然科学研究理事会;
关键词
Channel estimation; Estimation; Quality of service; Costs; Simulation; Signal to noise ratio; Programming; Reconfigurable intelligent surface; broadbeam; beamforming; semi-definite programming; difference-of-convex; REFLECTING SURFACE; BEAMFORMING DESIGN; MASSIVE MIMO; IRS; SYSTEMS;
D O I
10.1109/TCOMM.2024.3354200
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Reconfigurable intelligent surface (RIS) has been identified as a promising disruptive innovation to realize a faster, safer and more efficient communication system. In this paper, we study the broad beamwidth design of RIS. A problem is formulated to achieve broadbeam with maximum and equal power gain within a pre-defined angular region given constraints of the unit modulus weights of RIS. Since the formulated problem is non-convex, where the optimal solution cannot be analytically obtained, we propose the difference-of-convex-based semi-definite programming (DC-SDP) algorithm. In addition, as important guidance of signal coverage for arbitrary angular regions, we mathematically derive the relationship between the angular range of the spatial sector and the maximum average received power. The upper bounds of the average received power with different RIS configurations are also obtained, where uniform rectangular array (URA) and uniform linear array (ULA) are considered. Simulation results demonstrate the effectiveness of our derivations and verify that our proposed DC-SDP algorithm is applicable in practical applications and outperforms other baseline methods. Overall, this work can be viewed as a foundation for the practical implementation of RIS on coverage enhancement and can also be seen as an initial step towards achieving channel estimation.
引用
收藏
页码:3079 / 3094
页数:16
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