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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2507.20113 |
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| _version_ | 1866911079227981824 |
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| author | Wang, Ji Tian, Jiayu Qin, Lijuan Cao, Kunrui Xu, Hongbo Li, Xingwang Quek, Tony. Q. S. |
| author_facet | Wang, Ji Tian, Jiayu Qin, Lijuan Cao, Kunrui Xu, Hongbo Li, Xingwang Quek, Tony. Q. S. |
| contents | Reconfigurable Intelligent Surfaces (RIS) dynamically control signal propagation to enhance wireless communications. This paper presents a novel framework for rotatable RIS assisted physical-layer multicast systems, aiming to maximize the sum of minimum multicast rates via joint optimization of base station beamforming, RIS phase shifts, and orientation. Unlike unicast or non-rotatable setups, the rotatable RIS adapts orientation to align signals with user groups, improving fairness and rates for weak users. An alternating optimization approach combines convex optimization for beamforming/phase shifts with exhaustive search and particle swarm optimization (PSO) for orientation. Majorization-Minimization-based algorithms solve subproblems iteratively. Simulation results show the framework achieves 24.1% rate improvement via exhaustive search and 20.0% via PSO over the non-rotatable RIS baseline, with PSO performance close to the exhaustive search upper bound, highlighting the benefits of physical-layer multicast and orientation optimization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_20113 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Rotatable RIS Assisted Physical Layer Multicasting Wang, Ji Tian, Jiayu Qin, Lijuan Cao, Kunrui Xu, Hongbo Li, Xingwang Quek, Tony. Q. S. Information Theory Reconfigurable Intelligent Surfaces (RIS) dynamically control signal propagation to enhance wireless communications. This paper presents a novel framework for rotatable RIS assisted physical-layer multicast systems, aiming to maximize the sum of minimum multicast rates via joint optimization of base station beamforming, RIS phase shifts, and orientation. Unlike unicast or non-rotatable setups, the rotatable RIS adapts orientation to align signals with user groups, improving fairness and rates for weak users. An alternating optimization approach combines convex optimization for beamforming/phase shifts with exhaustive search and particle swarm optimization (PSO) for orientation. Majorization-Minimization-based algorithms solve subproblems iteratively. Simulation results show the framework achieves 24.1% rate improvement via exhaustive search and 20.0% via PSO over the non-rotatable RIS baseline, with PSO performance close to the exhaustive search upper bound, highlighting the benefits of physical-layer multicast and orientation optimization. |
| title | Rotatable RIS Assisted Physical Layer Multicasting |
| topic | Information Theory |
| url | https://arxiv.org/abs/2507.20113 |