Multiple Scattering Model for Beam Synthesis With Reconfigurable Intelligent Surfaces

Article Engineering, Electrical & Electronic

On the Study of Reconfigurable Intelligent Surfaces in the Near-Field Region

Peng Mei et al.

Summary: This study evaluates the benefits of using a reconfigurable intelligent surface (RIS) with a large aperture for near-field communications, compared to conventional far-field communications. The electric fields in the near-field region from near-field focusing and far-field RISs are simulated and compared. The study defines metrics for benefit distance and near-field gain and calculates the cumulative distribution function (CDF) related to the near-field gain. The effects of RIS size and phase quantization on the benefits are discussed, and the maximum focal distance for a near-field focusing RIS is derived.

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION (2022)

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Article Engineering, Electrical & Electronic

Modeling and Architecture Design of Reconfigurable Intelligent Surfaces Using Scattering Parameter Network Analysis

Shanpu Shen et al.

Summary: This paper investigates the use of reconfigurable intelligent surfaces (RISs) in wireless communication, proposing new RIS architectures and communication models. It is found that using group and fully connected reconfigurable impedance networks can significantly improve the received signal power compared to traditional single connected scenarios.

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS (2022)

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Article Engineering, Electrical & Electronic

Communication Models for Reconfigurable Intelligent Surfaces: From Surface Electromagnetics to Wireless Networks Optimization

Marco Di Renzo et al.

Summary: A reconfigurable intelligent surface (RIS) is a planar structure that can dynamically control electromagnetic waves and has emerged as a promising technology in wireless communications. This tutorial article focuses on communication models for RISs, reviewing commonly used models and emphasizing the inhomogeneous surface impedance-based models. It also discusses the differences between local and global designs and how approximate global designs can be achieved using locally passive RISs.

PROCEEDINGS OF THE IEEE (2022)

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Article Engineering, Electrical & Electronic

Wireless Communications With Reconfigurable Intelligent Surface: Path Loss Modeling and Experimental Measurement

Wankai Tang et al.

Summary: This article develops free-space path loss models for RIS-assisted wireless communications in different scenarios by studying the physics and electromagnetic nature of RISs, validated through extensive simulation results and experimental measurements. The models reveal the relationships between the path loss and various factors, paving the way for further theoretical studies and practical applications in the field.

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS (2021)

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Article Engineering, Electrical & Electronic

Intelligent Reflecting Surface Assisted Free-Space Optical Communications

Vahid Jamali et al.

Summary: This article discusses the potential role of intelligent reflecting surfaces (IRS) in relaxing the requirement of line-of-sight connection in Free-space optical (FSO) systems, compares optical IRSs with radio frequency IRSs and optical relays, and identifies various open problems for future research on IRS-assisted FSO communications.

IEEE COMMUNICATIONS MAGAZINE (2021)

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Article Computer Science, Information Systems