Multi-user Downlink with Reconfigurable Intelligent Metasurface Antennas (RIMSA) Array
Xuejian Wei, and Hui-Ming Wang

TL;DR
This paper introduces RIMSA, a novel antenna technology using reconfigurable metasurfaces for multi-user downlink communication, optimizing digital processing and phase responses to enhance sum-rate performance.
Contribution
It proposes the RIMSA system architecture and develops new optimization algorithms for joint digital and phase response design in multi-user MIMO scenarios.
Findings
Significant performance gains over conventional algorithms.
Effective joint optimization of digital processing and RIMSA phase responses.
Closed-form solutions for digital precoder and combiner subproblems.
Abstract
Reconfigurable Intelligent Surfaces (RIS) is a transformative technology with great potential in many applications in wireless communications and realizing the Internet of Everything at sixth generation (6G). In this study, we propose a wireless system where the RIS acts as an antenna, which we call Reconfigurable Intelligent Metasurface Antennas (RIMSA). In particular, the base station (BS) equipped with a RIMSA array performs downlink transmissions to multiple users, where each user has a single or multiple RIMSA/RF links, and we aim to solve the sum-rate maximization problem by jointly optimizing the digital processing matrix of the transceivers and the phase responses of RIMSA array at both BS and users. For the multi-user multiple-input single-output (MU-MISO) scenario, we develop an alternating optimization algorithm to slove the problem, where a fractional programming (FP) is…
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