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Author(s): Souto, N.
Date: 2023
Title: Joint active and passive beamforming for RIS-aided MIMO communications with low-resolution phase shifts
Journal title: IEEE Communications Letters
Volume: 27
Number: 6
Pages: 1604 - 1608
Reference: Souto, N. (2023). Joint active and passive beamforming for RIS-aided MIMO communications with low-resolution phase shifts. IEEE Communications Letters, 27(6), 1604-1608.
ISSN: 1089-7798
DOI (Digital Object Identifier): 10.1109/LCOMM.2023.3264935
Keywords: Reconfigurable intelligent surface (RIS)
Multiple-input multiple-output (MIMO)
Discrete phase shifts
Abstract: Practical hardware limitations often impose a reduced number of available phase shifts at the elements of a reconfigurable intelligent surface (RIS). Most works often assume continuous phase-shits at the RIS elements for the transmit and passive beamforming optimization, which can lead to substantial performance loss. Therefore, to harvest the gains of RIS-assisted multi-stream multiple-input multiple-output (MIMO) communications under realistic phase shifts, this letter proposes a problem formulation for the maximization of the achievable rate over the transmit precoder and RIS elements, which avoids an explicit discrete constraint while still incorporating its effect. To efficiently tackle the resulting problem when considering large arrays and RIS panels, an iterative algorithm is derived which comprises a sequence of simple projections. Simulation results demonstrate that the proposed design can be very effective, especially with low-resolution phase-shifts.
Peerreviewed: yes
Access type: Open Access
Appears in Collections:IT-RI - Artigos em revistas científicas internacionais com arbitragem científica

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