Reconfigurable Intelligent Surfaces as Spatial Filters

IF 8.9 1区 计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Transactions on Wireless Communications Pub Date : 2024-08-29 DOI:10.1109/TWC.2024.3447910
Sotiris Droulias;Giorgos Stratidakis;Emil Björnson;Angeliki Alexiou
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Abstract

The design of Reconfigurable Intelligent Surfaces (RISs) is typically based on treating the RIS as an infinitely large surface that steers incident plane waves toward the desired direction. In practical implementations, however, the RIS has finite size and the incident wave is a beam of finite k-content, rather than a plane wave of $\delta $ -like k-content. To understand the implications of the finite extent of both the RIS and the incident beam, here we treat the RIS as a spatial filter, the transfer function of which is determined by both the prescribed RIS operation and the shape of the RIS boundary. Following this approach, we study how the RIS transforms the incident k-content and we demonstrate how, by engineering the RIS shape, size, and response, it is possible to shape beams with nontrivial k-content to suppress unwanted interference, while concentrating the reflected power to desired directions. We also demonstrate how our framework, when applied in the context of near-field communications, provides the necessary insights into how the wavefront of the beam is tailored to enable focusing, propagation with invariant profile, and bending, beyond conventional beamforming.
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作为空间滤波器的可重构智能曲面
可重构智能表面(RIS)的设计通常基于将 RIS 视为一个无限大的表面,它能将入射平面波导向所需的方向。然而,在实际应用中,可重构智能表面的尺寸是有限的,入射波是一束具有有限 k-含量的波束,而不是具有类似 $\delta $ k-含量的平面波。为了理解 RIS 和入射光束的有限范围所产生的影响,我们将 RIS 视为空间滤波器,其传递函数由规定的 RIS 操作和 RIS 边界的形状决定。按照这种方法,我们研究了 RIS 如何转换入射的 k-内容,并演示了如何通过设计 RIS 的形状、大小和响应,来塑造具有非对称 k-内容的光束,以抑制不必要的干扰,同时将反射功率集中到所需的方向。我们还展示了在近场通信背景下应用我们的框架时,如何提供必要的洞察力,以了解如何定制光束波面,从而实现聚焦、以不变轮廓传播和弯曲,超越传统的波束成形。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
18.60
自引率
10.60%
发文量
708
审稿时长
5.6 months
期刊介绍: The IEEE Transactions on Wireless Communications is a prestigious publication that showcases cutting-edge advancements in wireless communications. It welcomes both theoretical and practical contributions in various areas. The scope of the Transactions encompasses a wide range of topics, including modulation and coding, detection and estimation, propagation and channel characterization, and diversity techniques. The journal also emphasizes the physical and link layer communication aspects of network architectures and protocols. The journal is open to papers on specific topics or non-traditional topics related to specific application areas. This includes simulation tools and methodologies, orthogonal frequency division multiplexing, MIMO systems, and wireless over optical technologies. Overall, the IEEE Transactions on Wireless Communications serves as a platform for high-quality manuscripts that push the boundaries of wireless communications and contribute to advancements in the field.
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