A Q-stem connected BD-RIS with a least-squares scattering matrix design can match fully connected RIS sum channel gain at modest Q in simulated multi-user MISO systems.
Beyond diagonal reconfigurable intelli- gent surfaces: From transmitting and reflecting modes to single-, group- and fully-connected architectures,
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A Novel Q-stem Connected Architecture for Beyond-Diagonal Reconfigurable Intelligent Surfaces
A Q-stem connected BD-RIS with a least-squares scattering matrix design can match fully connected RIS sum channel gain at modest Q in simulated multi-user MISO systems.