Physics-Aware RIS Codebook Compilation for Near-Field Beam Focusing under Mutual Coupling and Specular Reflections
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arXiv
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| Format: | Preprint |
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2026
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| author | Papadopoulos, Alexandros I. Pistela, Maria Anna Tyrovolas, Dimitrios Lalas, Antonios Votis, Konstantinos Ioannidis, Sotiris Karagiannidis, George K. Liaskos, Christos |
| author_facet | Papadopoulos, Alexandros I. Pistela, Maria Anna Tyrovolas, Dimitrios Lalas, Antonios Votis, Konstantinos Ioannidis, Sotiris Karagiannidis, George K. Liaskos, Christos |
| contents | Next-generation wireless networks are envisioned to achieve reliable, low-latency connectivity within environments characterized by strong multipath and severe channel variability. Programmable wireless environments (PWEs) address this challenge by enabling deterministic control of electromagnetic (EM) propagation through software-defined reconfigurable intelligent surfaces (RISs). However, effectively configuring RISs in real time remains a major bottleneck, particularly under near-field conditions where mutual coupling and specular reflections alter the intended response. To overcome this limitation, this paper introduces MATCH, a physics-based codebook compilation algorithm that explicitly accounts for the EM coupling among RIS unit cells and the reflective interactions with surrounding structures, ensuring that the resulting codebooks remain consistent with the physical characteristics of the environment. Finally, MATCH is evaluated under a full-wave simulation framework incorporating mutual coupling and secondary reflections, demonstrating its ability to concentrate scattered energy within the focal region, confirming that physics-consistent, codebook-based optimization constitutes an effective approach for practical and efficient RIS configuration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_12982 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Physics-Aware RIS Codebook Compilation for Near-Field Beam Focusing under Mutual Coupling and Specular Reflections Papadopoulos, Alexandros I. Pistela, Maria Anna Tyrovolas, Dimitrios Lalas, Antonios Votis, Konstantinos Ioannidis, Sotiris Karagiannidis, George K. Liaskos, Christos Signal Processing Networking and Internet Architecture Next-generation wireless networks are envisioned to achieve reliable, low-latency connectivity within environments characterized by strong multipath and severe channel variability. Programmable wireless environments (PWEs) address this challenge by enabling deterministic control of electromagnetic (EM) propagation through software-defined reconfigurable intelligent surfaces (RISs). However, effectively configuring RISs in real time remains a major bottleneck, particularly under near-field conditions where mutual coupling and specular reflections alter the intended response. To overcome this limitation, this paper introduces MATCH, a physics-based codebook compilation algorithm that explicitly accounts for the EM coupling among RIS unit cells and the reflective interactions with surrounding structures, ensuring that the resulting codebooks remain consistent with the physical characteristics of the environment. Finally, MATCH is evaluated under a full-wave simulation framework incorporating mutual coupling and secondary reflections, demonstrating its ability to concentrate scattered energy within the focal region, confirming that physics-consistent, codebook-based optimization constitutes an effective approach for practical and efficient RIS configuration. |
| title | Physics-Aware RIS Codebook Compilation for Near-Field Beam Focusing under Mutual Coupling and Specular Reflections |
| topic | Signal Processing Networking and Internet Architecture |
| url | https://arxiv.org/abs/2601.12982 |