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A Modular Pragmatic Architecture for Multiuser MIMO with Array-Fed RIS
We propose a power- and hardware-efficient, pragmatic, modular, multiuser/multibeam array-fed RIS architecture particularly suited to operate in very high frequency bands (high mmWave and sub-THz), where channels are typically sparse in the beamspace and line-of-sight (LOS) is required to achieve an acceptable received signal level.
A New Old Idea: Beam-Steering Reflectarrays for Efficient Sub-THz Multiuser MIMO
We present a novel, power- & hardware-efficient, multiuser, multibeam RIS (Reflective Intelligent Surface) architecture for multiuser MIMO, especially for very high frequency bands (e. g., high mmWave and sub-THz), where channels are typically sparse in the beamspace and LOS is the dominant component.
Power Transfer between Two Antenna Arrays in the Near Field
Furthermore, the behavior of the power transmission coefficient is more sensitive to the $F/D$ ratio than to a particular RIS size.
Rate Loss due to Beam Cusping in Grid of Beams
We consider array antenna elements with non-zero aperture and axisymmetric radiation pattern with a certain directivity, unlike the ideal isotropic antenna elements widely considered in theoretical papers on array processing and RF beamforming.
