Article Dans Une Revue IEEE Wireless Communications Letters Année : 2025

Experimental Multiport-Network Parameter Estimation and Optimization for Multi-Bit RIS

Résumé

Physics-consistent theoretical studies on RIS-parametrized wireless channels use models from multiport-network theory (MNT) to capture mutual-coupling (MC) effects. However, in practice, RIS design and radio environment are partially or completely unknown. We fill a research gap on how to estimate the MNT model parameters in such experimentally relevant scenarios. Our technique efficiently combines closed-form and gradient-descent steps, and it can be applied to multi-bit-programmable RIS elements. We discuss inevitable (but operationally irrelevant) parameter ambiguities. We experimentally validate our technique in an unknown rich-scattering environment parametrized by eight 6-bit-programmable RIS elements of unknown design. We experimentally evaluate the performance of RIS configurations optimized with the estimated MNT model and an MC-unaware cascaded model. While the models differ in accuracy by up to 17 dB, the end-to-end performance differences are small.

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hal-05395482 , version 1 (30-04-2026)

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Philipp del Hougne. Experimental Multiport-Network Parameter Estimation and Optimization for Multi-Bit RIS. IEEE Wireless Communications Letters, 2025, 15, pp.790-794. ⟨10.1109/lwc.2025.3631881⟩. ⟨hal-05395482⟩
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