For parameter estimation over blocked direct links, optimizing a fully connected beyond-diagonal RIS yields provably higher Fisher information than diagonal RIS designs while limiting eavesdropper information.
RIS-ass isted physical layer security in emerging RF and optical wireless communica- tion systems: A comprehensive survey,
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Beyond Diagonal RIS Design for Parameter Estimation With and Without Eavesdropping
For parameter estimation over blocked direct links, optimizing a fully connected beyond-diagonal RIS yields provably higher Fisher information than diagonal RIS designs while limiting eavesdropper information.