The content discusses the modeling and physical layer aspects of nonlocal (redirective) reconfigurable intelligent surfaces (RIS) for wireless communication. It highlights the advantages of redirective RIS over conventional reflective RIS, including:
Lower overhead through codebook-based reconfigurability: Redirective RIS can be reconfigured using a small codebook, leading to lower control overhead compared to reflective RIS.
Decoupled wave manipulations: Redirective RIS can selectively manipulate impinging waves based on incident angle, unlike reflective RIS which have local position-dependent scattering response.
Higher efficiency in multiuser scenarios: Redirective RIS can support multifunctional wave manipulation, enabling efficient simultaneous data forwarding to multiple users, whereas reflective RIS suffer from high interference and gain loss.
The content also discusses the scalability and compactness issues of redirective RIS, and proposes efficient nonlocal RIS architectures such as fractionated lens-based RIS and mirror-backed phase-masks that do not require additional control complexity and overhead while still offering better performance than conventional local RIS.
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arxiv.org
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by Amine Mezgha... ที่ arxiv.org 04-04-2024
https://arxiv.org/pdf/2210.05928.pdfสอบถามเพิ่มเติม