RISs placed at DFT directions of the base station enable a low-complexity JSDM pre-beamformer that approximately block-diagonalizes the multiuser channel and improves sum spectral efficiency in blocked coverage holes.
Joint spatial division and multiplexing for FDD in intelligent reflecting surface-assisted massive MIMO systems,
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Joint Spatial Division and Multiplexing with Customized Orthogonal Group Channels in Multi-RIS-Assisted Systems
RISs placed at DFT directions of the base station enable a low-complexity JSDM pre-beamformer that approximately block-diagonalizes the multiuser channel and improves sum spectral efficiency in blocked coverage holes.