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.
Beyond diagonal reconfigu rable intelli- gent surfaces: From transmitting and reflecting modes to sin gle-, group- , and fully-connected architectures,
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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.