T-Parameters Based Modeling for Stacked Intelligent Metasurfaces: Tractable and Physically Consistent Model
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915235483353088 |
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| author | Yahya, Hamad Nerini, Matteo Clerckx, Bruno Debbah, Merouane |
| author_facet | Yahya, Hamad Nerini, Matteo Clerckx, Bruno Debbah, Merouane |
| contents | This work develops a physically consistent model for stacked intelligent metasurfaces (SIM) using multiport network theory and transfer scattering parameters (T-parameters). Unlike the scattering parameters (S-parameters) model, the developed T-parameters model is simpler and more tractable. Moreover, the T-parameters constraints for lossless reciprocal reconfigurable intelligent surfaces (RISs) are derived. Additionally, a gradient descent algorithm (GDA) is introduced to maximize sum-rate in SIM-aided multiuser scenarios, demonstrating that mutual coupling and feedback between consecutive layers enhance performance. However, increasing SIM layers with a fixed total number of elements typically degrades sum-rate, unless the simplified channel model employing Rayleigh-Sommerfeld diffraction coefficients is utilized. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_09777 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | T-Parameters Based Modeling for Stacked Intelligent Metasurfaces: Tractable and Physically Consistent Model Yahya, Hamad Nerini, Matteo Clerckx, Bruno Debbah, Merouane Signal Processing This work develops a physically consistent model for stacked intelligent metasurfaces (SIM) using multiport network theory and transfer scattering parameters (T-parameters). Unlike the scattering parameters (S-parameters) model, the developed T-parameters model is simpler and more tractable. Moreover, the T-parameters constraints for lossless reciprocal reconfigurable intelligent surfaces (RISs) are derived. Additionally, a gradient descent algorithm (GDA) is introduced to maximize sum-rate in SIM-aided multiuser scenarios, demonstrating that mutual coupling and feedback between consecutive layers enhance performance. However, increasing SIM layers with a fixed total number of elements typically degrades sum-rate, unless the simplified channel model employing Rayleigh-Sommerfeld diffraction coefficients is utilized. |
| title | T-Parameters Based Modeling for Stacked Intelligent Metasurfaces: Tractable and Physically Consistent Model |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2503.09777 |