Physically Consistent Modeling of Stacked Intelligent Metasurfaces Implemented with Beyond Diagonal RIS

Matteo Nerini; Bruno Clerckx

Physically Consistent Modeling of Stacked Intelligent Metasurfaces Implemented with Beyond Diagonal RIS

Information Theory 2024-05-14 v2 Signal Processing math.IT

Authors: Matteo Nerini , Bruno Clerckx

Abstract

Stacked intelligent metasurface (SIM) has emerged as a technology enabling wave domain beamforming through multiple stacked reconfigurable intelligent surfaces (RISs). SIM has been implemented so far with diagonal RIS (D-RIS), while SIM implemented with beyond diagonal RIS (BD-RIS) remains unexplored. Furthermore, a model of SIM accounting for mutual coupling is not yet available. To fill these gaps, we derive a physically consistent channel model for SIM-aided systems and clarify the assumptions needed to obtain the simplified model used in related works. Using this model, we show that 1-layer SIM implemented with BD-RIS achieves the performance upper bound with limited complexity.

Keywords

stacked intelligent metasurfaces reconfigurable intelligent surface beamforming

Cite

@article{arxiv.2402.12602,
  title  = {Physically Consistent Modeling of Stacked Intelligent Metasurfaces Implemented with Beyond Diagonal RIS},
  author = {Matteo Nerini and Bruno Clerckx},
  journal= {arXiv preprint arXiv:2402.12602},
  year   = {2024}
}

Comments

Accepted by IEEE for publication

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