Results 51 to 60 of about 3,484 (213)

A hybrid PSO-GWO-based phase shift design for a hybrid-RIS-aided heterogeneous network system

Heliyon
The effectiveness of developing reconfigurable intelligent surfaces (RIS) for heterogeneous network (HetNet) systems has resulted in significant spectral efficiency (SE) gains.
Abdel Nasser Soumana Hamadou, Ciira wa Maina, Moussa Moindze Soidridine   +2 more
doaj   +1 more source

Conformal Reconfigurable Intelligent Surfaces: A Cylindrical Geometry Perspective

Advanced Electronic Materials, EarlyView.
Cylindrical reconfigurable intelligent surfaces are explored for low‐complexity beam steering using one‐bit meta‐atoms. A multi‐level modeling approach, including optimization‐based synthesis, demonstrates that even minimal hardware can support directive scattering.
Filippo Pepe, Ivan Iudice, Giuseppe Castaldi, Marco Di Renzo, Vincenzo Galdi   +4 more
wiley   +1 more source

Highly Efficient Hybrid Reconfigurable Intelligent Surface Approach for Power Loss Reduction and Coverage Area Enhancement in 6G Networks

Applied Sciences
This paper introduces a novel efficient hybrid reconfigurable intelligent surface (RIS) approach designed to significantly reduce power loss and enhance coverage area in 6G networks.
Aya Kh. Ahmed, Hamed S. Al-Raweshidy
doaj   +1 more source

Updatable Closed‐Form Evaluation of Arbitrarily Complex Multiport Network Connections

Advanced Electronic Materials, EarlyView.
The inverse design of electrically large wave devices often uses reduced‐order multiport models with discrete optimization, requiring many evaluations of complex interconnections between subsystems that differ only in a few blocks. This paper introduces a closed‐form framework enabling efficient Woodbury low‐rank updates of related, previous ...
Hugo Prod'homme, Philipp del Hougne
wiley   +1 more source

Multi-Functional Reconfigurable Intelligent Surface Assisted Security Communication Systems Under Imperfect CSI of Eavesdroppers

IEEE Access
In order to overcome the “multiplicative fading” loss and half-space coverage limitations faced by reconfigurable intelligent surfaces (RIS) in secure communications, a more practical multi-functional reconfigurable intelligent surface (MF ...
Rui-Bao Zhang, Dian-Wu Yue, Yu Sun
doaj   +1 more source

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

Path Loss Modeling for RIS-Assisted Wireless Communication in Tunnel Scenarios

Sensors
Aiming to address the problem of limited transmission distance in applying reconfigurable intelligent surface (RIS) technology, this study leverages a tunnel simulation platform to investigate RIS-assisted wireless communication systems.
Qi Yang, Yating Wu, Hengkai Zhao, Yichen Feng, Yanqiong Sun, Zhou Fang, Guoxin Zheng   +6 more
doaj   +1 more source

Design of Active Reconfigurable Intelligent Surface for Sub-6 GHz

, 2023
This paper proposes a channel model for reconfigurable intelligent surfaces (RIS). The model takes into account the losses incurred by digital phase shifters in different phase states and considers the influence of antenna polarization, making it more ...
Wu, Chi-Hung
core  

Plug-In RIS: A Novel Approach to Fully Passive Reconfigurable Intelligent Surfaces

IEEE Transactions on Wireless Communications
This paper presents a promising design concept for reconfigurable intelligent surfaces (RISs), named plug-in RIS, wherein the RIS is plugged into an appropriate position in the environment, adjusted once according to the location of both base station and blocked region, and operates with fixed beams to enhance the system performance. The plug-in RIS is
Mahmoud Raeisi, Ibrahim Yildirim, Mehmet Cagri Ilter, Majid Gerami, Ertugrul Basar   +4 more
openaire   +3 more sources

Recent Advances in Programmable Metasurfaces and Meta‐Devices

Advanced Electronic Materials, EarlyView.
Programmable metasurfaces enable various novel functionalities by dynamically tuning electromagnetic wavefronts. This article provides a comprehensive review of recent advances in microwave and terahertz programmable metasurfaces, covering electrical, thermal, optical, and mechanical control mechanisms.
Linda Shao, Chong He, Nan Wang, Liming Si, Weiren Zhu   +4 more
wiley   +1 more source