A stacked intelligent metasurface at the base station can approximate zero-forcing multiuser beamfocusing in the near field using passive wave propagation.
Frequency-dependent beamforming for RIS-assisted wideband terahertz systems,
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Stacked Intelligent Metasurface Enabled Near-Field Multiuser Beamfocusing in the Wave Domain
A stacked intelligent metasurface at the base station can approximate zero-forcing multiuser beamfocusing in the near field using passive wave propagation.