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Capacity Analysis and Rate Maximization Design in RIS-Aided Uplink Multi-User MIMO.pdf (846.2 kB)
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Capacity Analysis and Rate Maximization Design in RIS-Aided Uplink Multi-User MIMO

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posted on 2023-03-17, 20:00 authored by Wei JiangWei Jiang, Hans Dieter Schotten

Reconfigurable intelligent surface (RIS) has recently drawn intensive attention due to its potential of simultaneously realizing high spectral and energy efficiency in a sustainable way. This paper focuses on the design of efficient transmission methods to maximize the uplink sum throughput in a RIS-aided multi-user multi-input multi-output (MU-MIMO) system. To provide an insightful basis, the channel capacity of RIS-aided MU-MIMO is theoretically analyzed. Then, the conventional transmission schemes based on orthogonal multiple access are presented as the baseline. From the information-theoretic perspective, we propose two novel schemes, i.e., \textit{joint transmission} based on the semidefinite relaxation of quadratic optimization problems and \textit{opportunistic transmission} relying on the best user selection. The superiority of the proposed schemes over the conventional ones in terms of achievable rates is justified through simulation results.

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Email Address of Submitting Author

wei.jiang@dfki.de

Submitting Author's Institution

DFKI - German Research Center for Artificial Intelligence

Submitting Author's Country

  • Germany

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