Energy efficiency optimization for a RIS-assisted multi-cell communication system based on a practical RIS power consumption model  

作　　者：Danning XU Yu HAN Xiao LI Jinghe WANG Shi JIN 

机构地区：[1]National Mobile Communications Research Laboratory,Southeast University,Nanjing,210096,China

出　　处：《Frontiers of Information Technology & Electronic Engineering》2023年第12期1717-1727,共11页信息与电子工程前沿（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Nos.62231009,61971126);the Natural Science Foundation of Jiangsu Province,China(No.BK20211511);the Jiangsu Province Frontier Leading Technology Basic Research Project,China(No.BK20212002)。

摘　　要：Reconfigurable intelligent surface(RIS)is widely accepted as a potential technology to assist in communication between base stations(BSs)and users in edge areas.We study the energy efficiency of a RIS-assisted multi-cell communication system with a realistic RIS power consumption model.With the goal of maximizing the energy efficiency of the system,we optimize the transmit beamforming vectors at the BS and the RIS phase shift matrix by a proposed alternative optimization algorithm.First,the transmit beamforming vector is optimized by solving the transformed weighted minimum mean square error(WMMSE)problem.Subsequently,to solve the inconvenience incurred by the discrete relationship between the RIS reflecting unit power consumption and its discrete phase shift,we use a continuous function to approximate their relationship.With this approximation,we can use the majorization minimization(MM)technique to optimize the continuous RIS phase shifts,and then quantize the obtained phase shifts to discrete ones.Simulation results demonstrate that the energy efficiency of the system is effectively optimized by the proposed algorithm.

关 键 词：Reconfigurable intelligent surface(RIS) Energy efficiency Multi-cell communication system 

分 类 号：TN92[电子电信—通信与信息系统]