An alternating optimization scheme with a closed-form SCA precoder update and a scaled projected gradient phase-shift update achieves linear per-iteration complexity in antennas and RIS elements for RIS-assisted MU-MIMO.
Towards smart and reconfigurable environment: Intelligent reflecting surface aided wireless network,
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On the Joint Beamforming Design for Large-scale Downlink RIS-assisted Multiuser MIMO Systems
An alternating optimization scheme with a closed-form SCA precoder update and a scaled projected gradient phase-shift update achieves linear per-iteration complexity in antennas and RIS elements for RIS-assisted MU-MIMO.