Hybrid BD-RIS architectures achieve equal or higher SNR than diagonal RIS counterparts in SISO links by partitioning into active/passive subsurfaces and using closed-form per-group optimization with Takagi factorization.
Smart radio environments empowered by reconfig- urable intelligent surfaces: How it works, state of researc h, and the road ahead
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A Family of Hybrid Beyond-Diagonal RIS Architectures: Design and Performance Analysis
Hybrid BD-RIS architectures achieve equal or higher SNR than diagonal RIS counterparts in SISO links by partitioning into active/passive subsurfaces and using closed-form per-group optimization with Takagi factorization.