@inproceedings{5ea233b85a304d5b8c3aa284f4ae96a0,
title = "Random Ising Hamiltonian Model of Metasurfaces in Complex Environments",
abstract = "The optimisation of Reconfigurable Intelligent Surfaces (RIS) requires tractable channel models that are electromagnetic compliant. We incorporate the effect of multipath fading in an impedance-based model of wireless communication links assisted by the RIS. The multi-path fading present in complex propagation environments is captured by a statistical model based on wave chaos theory: The random coupling model. We show that the so obtained MIMO transfer matrix configures as a Sherrington-Kirkpatrick Hamiltonian with generalised complex-valued Hopfield couplings. For both SISO and MIMO systems, we perform numerical Montecarlo simulations that elucidate the transition to Gaussianity, as parameterised by the average environment losses and RIS line-of-sight channel strengths. Finally, we discuss a research roadmap that includes: i) Retrieving the transmission matrix of complex environments from random coupling fluctuation; ii) Studying of the relation between channel hardening and the onset of a spin-glass phase. Achieved results are important for smart surface environment design.",
keywords = "MIMO, Metasurface, Random Ising Hamiltonian, Reconfigurable Intelligent Surface, Spin Glass",
author = "Gabriele Gradoni and Sergio Terranova and Lim, {Qi Jian} and Charles Ross and Zhen Peng",
note = "Publisher Copyright: {\textcopyright} 2023 European Association for Antennas and Propagation.; 17th European Conference on Antennas and Propagation, EuCAP 2023 ; Conference date: 26-03-2023 Through 31-03-2023",
year = "2023",
doi = "10.23919/EuCAP57121.2023.10132939",
language = "English (US)",
series = "17th European Conference on Antennas and Propagation, EuCAP 2023",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "17th European Conference on Antennas and Propagation, EuCAP 2023",
address = "United States",
}