Results 81 to 90 of about 5,091,880 (125)

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

Uplink Achievable Rate Maximization for Reconfigurable Intelligent Surface Aided Millimeter Wave Systems with Resolution-Adaptive ADCs

, 2021
International audienceIn this letter, we investigate the uplink of a reconfigurable intelligent surface (RIS)-aided millimeter-wave (mmWave) multiuser system. In the considered system, however, problems with hardware cost and power consumption arise when
Sun, Wei, Wei, Ning, Gui, Guan, Zhao, Jun, Xiu, Yue, Di Renzo, Marco, Basar, Ertugrul   +6 more
core   +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

Multi-user scheduling management via Reconfigurable Intelligent Surfaces (RIS)

reservedLo scopo di questa tesi è trovare una soluzione al problema della schedulazione multi-utente in ambienti MISO, servendosi di Superfici Intelligenti Riconfigurabili (dette RIS) e assumendo una Channel Statistic Information (CSI) statistica e non ...
PESENATO, MATTEO
core  

Reconfigurable Intelligent Surface-Assisted Physical Layer Security

12631268We propose a reconfigurable intelligent surface (RIS)-assisted wiretap channel, where the RIS is strategically deployed to provide a spatial separation to the transmitter, and orthogonal combiners are employed at the legitimate receiver to ...
Li, Xudong, Tohidi, Ehsan, Bjelakovic, Igor, Stanczak, Slawomir, Frey, Matthias   +4 more
core   +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