Hybrid RISs that split incoming signals between reflection and sensing can estimate individual channels with fewer pilots than conventional RISs, at the cost of a reflection-versus-sensing trade-off.
Low-to-zero-overhead IRS recon- figuration: Decoupling illumination and channel estimation,
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Hybrid RISs for Simultaneous Tunable Reflections and Sensing
Hybrid RISs that split incoming signals between reflection and sensing can estimate individual channels with fewer pilots than conventional RISs, at the cost of a reflection-versus-sensing trade-off.