An Optimal and Fast Precoding for RIS-Assisted MIMO Communications

Feng Yimeng

doi:10.23919/JCC.ja.2022-0082

An Optimal and Fast Precoding for RIS-Assisted MIMO Communications

2024-11-01

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DOI：10.23919/JCC.ja.2022-0082

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In addition to conventional antenna-based array, the reconfigurable intelligent surface (RIS)holds promise as an alternative technology for manufacturing massive multi-input multi-output (MIMO)array for beyond 5G communications. This paper designs a fast algorithm to optimize the RIS-based MIMO precoder for maximizing the spectral efficiency, which includes the digital precoder and the RIS reflection phases. We evaluate the optimality ofthe algorithm by deriving an RIS channel capacity up-per bound utilizing majorization theory. Our scheme can work for an RIS in both frequency flat and frequency selective channels, with either continuously or discretely tunable phases. The simulation results show that the proposed algorithm can achieve the capacity upper bound in some scenarios, which empirically proves its optimality. It is also shown that our algorithm is one-to-two orders of magnitude faster than the state-of-the-art methods in the literature

Keyword:

majorization theory

MIMO

precoder

reconfigurable intelligent surface

An Optimal and Fast Precoding for RIS-Assisted MIMO Communications

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