Grouping two opposite-polarization elements in a beyond diagonal RIS achieves the fully connected performance bound in dual-polarized line-of-sight links, and dual-polarized BD-RIS offers gains over conventional RIS even under LoS.
Limited feedback beamforming systems for dual-polarized MIMO channels,
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Dual-Polarized Beyond Diagonal RIS
Grouping two opposite-polarization elements in a beyond diagonal RIS achieves the fully connected performance bound in dual-polarized line-of-sight links, and dual-polarized BD-RIS offers gains over conventional RIS even under LoS.