A closed-form plus gradient-descent technique estimates multiport-network parameters for multi-bit RISs in unknown environments; experiments show mutual-coupling-aware models are far more accurate but not much better for end-to-end optimization.
Virtual VNA 2.0: Ambiguity-free scattering matrix estimation by terminating not-directly-accessible ports with tunable and coupled loads,
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Experimental Multiport-Network Parameter Estimation and Optimization for Multi-Bit RIS
A closed-form plus gradient-descent technique estimates multiport-network parameters for multi-bit RISs in unknown environments; experiments show mutual-coupling-aware models are far more accurate but not much better for end-to-end optimization.