Results 51 to 60 of about 1,236 (133)

Optical STAR-RIS-Aided VLC Systems: RSMA Versus NOMA

IEEE Open Journal of the Communications Society
A critical concern within the realm of visible light communications (VLC) pertains to enhancing system data rate, particularly in scenarios where the direct line-of-sight (LoS) connection is obstructed by obstacles.
Omar Maraqa, Sylvester Aboagye, Telex M. N. Ngatched   +2 more
doaj   +1 more source

Cascaded channel decoupling based solution for RIS regulation matrix

Intelligent and Converged Networks
This article presents a pioneering solution to address the challenges of reconfigurable intelligent surface (RIS), employing a cascaded channel decoupling strategy.
Yajun Zhao
doaj   +1 more source

Multi-user frequency selective beam steering by reconfigurable intelligent surfaces in the Ka-band

Scientific Reports
Reconfigurable intelligent surfaces (RIS) have been proposed to extend the coverage of wireless communication signals at mm-wave frequencies. Here, we designed and fabricated a reconfigurable intelligent surface (RIS) for multi-user frequency selective ...
Lukas Mueller, Alexander Wolff, Steffen Klingel, Janis Krieger, Lars Franke, Ralf Stemler, Marco Rahm   +6 more
doaj   +1 more source

STAR-RIS-Assisted Millimeter-Wave Secure Communication with Multiple Eavesdroppers

Mathematics
Aiming to address the limited coverage of conventional reconfigurable intelligent surfaces (RISs), this study proposes a millimeter-wave secure communication scheme based on the simultaneously transmitting and reflecting reconfigurable intelligent ...
Binghui Qian, Jingping Qiao, Chuanting Zhang   +2 more
doaj   +1 more source

Robust and secure communications using dynamic rotations reconfigurable intelligent surface

ICT Express
This paper investigates the secure transmission problem using a dynamically reconfigurable intelligent surface (RIS). Considering an eavesdropping scenario where a multi-antenna eavesdropper has inadequate channel state information, a resilient ...
Kunyu Li, Guoping Zhang, Hongbo Xu, Ruijie Li, Yun Chen, Xingxing Huang   +5 more
doaj   +1 more source

STAR-RIS-assisted key generation method in quasi-static environment

EURASIP Journal on Wireless Communications and Networking
In this paper, we introduce a new method to solve the low-entropy problem in a quasi-static environment. We utilize a simultaneous transmission and reflection reconfigurable intelligent surface (STAR-RIS) that transmits and reflects incoming signals to ...
Yang Ma, Liquan Chen, Tianyu Lu, Yufan Song, Kailin Cao   +4 more
doaj   +1 more source

A Survey of Multiple Reconfigurable Intelligent Surface Aided Systems

IEEE Access
Reconfigurable intelligent surface (RIS) can establish reflection links between base stations and users, providing high passive beamforming gain that significantly enhances the system’s achievable rate. Given the outstanding performance of RIS, we
Renjie Liang, Junjie Liang
doaj   +1 more source

Proposed Multiple Reconfigurable Intelligent Surfaces to Mitigate the Inter-User-Interference Problem in NLOS

Journal of Communications Software and Systems
Reconfigurable Intelligent Surfaces (RIS) are gaining significant global interest as a potential technology that could enable 6G. An efficient method employs passive element reflectors to extend coverage of the non-line of sight (NLOS) millimeter-wave ...
Bushra Jarjees Qeryaqos, Saad Ahmed Ayoob   +1 more
doaj   +1 more source

The Deep Deterministic Policy Gradient Algorithm Based on RIS Technology in a Coal Mine Tunnel

Applied Sciences
Reconfigurable Intelligent Surface (RIS) technology relies on its reconfigurable electromagnetic properties and offers an efficient solution for enhancing signal quality in coal mine communications.
Shuqi Wang, Fengjiao Wang, Wei Zhang, Yaqi Wang   +3 more
doaj   +1 more source

Joint interference alignment and beyond diagonal RIS design for maximizing SNR in MIMO device-to-device communications

Scientific Reports
As a novel and flexible branch of RIS architectures, beyond-diagonal reconfigurable intelligent surface (BD-RIS) has been proposed recently to manipulate wireless environment and expand the coverage benefits. One efficient BD-RIS has been realized in the
Bei Ma
doaj   +1 more source