Optimizing SIM phase shifts before the digital beamformer, with an inner iterative projected-gradient loop, achieves up to 115.53% higher achievable sum rate than benchmark AO schemes in simulation.
Stacked intelligent metasurfaces for multiuser downlin k beamforming in the wave domain,
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A Refined Alternating Optimization for Sum Rate Maximization in SIM-Aided Multiuser MISO Systems
Optimizing SIM phase shifts before the digital beamformer, with an inner iterative projected-gradient loop, achieves up to 115.53% higher achievable sum rate than benchmark AO schemes in simulation.