Broad Beam Reflection for RIS-Assisted MIMO Systems with Planar Arrays
2023 57th Asilomar Conference on Signals, Systems, and Computers(2023)
摘要
While reconfigurable intelligent surface (RIS)-aided user-specific
beamforming has been vastly investigated, the aspect of utilizing RISs for
assisting cell-specific transmission has been largely unattended. Aiming to
fill this gap, we study a downlink broadcasting scenario where a base station
(BS) sends a cell-specific signal to all the users located in a wide angular
area with the assistance of a dual-polarized RIS. We utilize the polarization
degree of freedom offered by this type of RIS and design the phase
configurations in the two polarizations in such a way that the RIS can radiate
a broad beam, thereby uniformly covering all azimuth and elevation angles where
the users might reside. Specifically, the per-polarization configuration
matrices are designed in such a way that the total power-domain array factor
becomes spatially flat over all observation angles implying that the RIS can
preserve the broad radiation pattern of a single element while boosting its
gain proportionally to its aperture size. We validate the mathematical analyses
via numerical simulations.
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关键词
Dual-polarized beamforming,Golay complementary pairs,power-domain array factor
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