Frontiers of Information Technology & Electronic Engineering
>> 2023,
Volume 24,
Issue 12
doi:
10.1631/FITEE.2300136
Energy efficiency optimization for a RIS-assisted multi-cell communication system based on a practical RIS power consumption model
National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
Received: 2023-03-01
Accepted: 2024-01-24
Available online: 2024-01-24
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Abstract
is widely accepted as a potential technology to assist in communication between base stations (BSs) and users in edge areas. We study the of a RIS-assisted with a realistic RIS power consumption model. With the goal of maximizing the 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 of the system is effectively optimized by the proposed algorithm.
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