A closed-form symmetric low-rank BD-RIS scattering matrix of rank 2r achieves the same determinant as the optimal unitary BD-RIS and near-optimal rates, implementable with only 2r-1 stems.
Characterization of singular numbers of products of operators in matrix algebras and finite von neumann algebras
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Optimal symmetric low-rank BD-RIS configuration maximizing the determinant of a MIMO link
A closed-form symmetric low-rank BD-RIS scattering matrix of rank 2r achieves the same determinant as the optimal unitary BD-RIS and near-optimal rates, implementable with only 2r-1 stems.