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Regularized Generalized Power Iteration Beamforming for Multi-RIS MU-MIMO

A scalable joint beamforming method that maximizes a lower bound on instantaneous sum spectral efficiency under imperfect CSIT by casting precoding as a generalized eigenvalue problem solved with generalized power iteration, handling RIS unit-modulus constraints through a regularization penalty, and alternating the two updates with block-diagonal structure for linear scaling in the number of surfaces.

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Scalable Beamforming Design for Multi-RIS-Aided MU-MIMO Systems with Imperfect CSIT Mintaek Oh and

This paper designs the beamforming for a downlink wireless system in which multiple reconfigurable intelligent surfaces (RIS) - passive panels of phase-shifting elements that reshape the propagation …