Results 11 to 20 of about 58,866 (304)

RIS-Assisted Green Secure Communications: Active RIS or Passive RIS?

IEEE Wireless Communications Letters, 2023
Reconfigurable Intelligent Surface (RIS) is one of the promising techniques for 6G wireless communications, and recently has also been shown to be able to improve secure communications. However, there is a "double fading" effect in the reflection link between base station and user, thus passive RIS only achieves a negligible secrecy gain in typical ...
Weigang Lv, Jiale Bai, Qingli Yan
exaly   +3 more sources

To RIS or Not to RIS: A Ray-Tracing Study of RIS-Assisted Indoor 5G Communications

2025 33rd European Signal Processing Conference (EUSIPCO)
Reconfigurable Intelligent Surfaces (RIS) leverage arrays of programmable elements to manipulate incident electromagnetic waves dynamically. In non-line-of-sight conditions between a 5G base station and user equipment, RIS can act as a passive relay, redirecting signals to get around obstacles.In this paper, we use the open-source Sionna library to ...
Khelifi, Manel, Lioce, Stefano, Saucez, Damien, Dabbous, Walid   +3 more
openaire   +4 more sources

RIS-Aided Integrated Sensing and Communication Systems: STAR-RIS Versus Passive RIS?

IEEE Open Journal of the Communications Society
A shortage of frequencies exists due to the demand of extensive connectivity and limited availability of spectrum. Thus a prominent solution of sharing spectrum between radar and communication systems has been proposed. Integrated sensing and communication (ISAC) aims to achieve complete integration and reciprocal advantages between communication and ...
Prajwalita Saikia, Anand Jee, Keshav Singh 0001, Cunhua Pan, Wan-Jen Huang, Theodoros A. Tsiftsis   +5 more
openaire   +3 more sources

Employing High-Dimensional RIS Information for RIS-Aided Localization Systems

IEEE Communications Letters
Reconfigurable intelligent surface (RIS)-aided localization systems have attracted extensive research attention due to their accuracy enhancement capabilities. However, most studies primarily utilized the base stations (BS) received signal, i.e., BS information, for localization algorithm design, neglecting the potential of RIS received signal, i.e ...
Tuo Wu, Cunhua Pan, Kangda Zhi, Hong Ren, Maged Elkashlan, Jiangzhou Wang, Chau Yuen   +6 more
core   +4 more sources

Monitoring of environmental gases and calf health in Italian Mediterranean buffalo herd

Revista Científica, 2023
In buffalo breeding, calves require special attention and housing systems that provide thermal comfort, good air quality, brightness, and adequate space.
Simona Leonetti , Monica Ambrosio , Mirko Scamardella , Chiara Caso , Angelo Coletta   +4 more
doaj   +1 more source

Research on the Rate of Devices-to-Devices Communication System based on Reconfigurable Intelligent Surface

Guangtongxin yanjiu, 2022
There are problems of interference between Devices-to-Devices (D2D) communication users and cellular users, mutual interference between D2D communication users, and environmental interference caused by the existence of environmental obstacles in the D2D ...
Feng-ting FU, Li LI, Jing ZHANG
doaj   +1 more source

A silver bullet? The role of radiology information system data mining in defining gunshot injury trends at a South African tertiary-level hospital

South African Journal of Radiology, 2021
Background: South Africa (SA) has no national injury surveillance system, and hence, non-fatal gunshot injuries are not routinely recorded. Most firearm-related injuries require multi-detector computer tomography (MDCT) assessment at a tertiary-level ...
Dale K. Creamer, Asif Bagadia, Clive Daniels, Richard D. Pitcher   +3 more
doaj   +1 more source

RIS-Assisted Grant-Free NOMA: User Pairing, RIS Assignment, and Phase Shift Alignment

, 2022
This paper introduces a reconfigurable intelligent surface (RIS)-assisted grant-free non-orthogonal multiple access (GF-NOMA) scheme. We propose a joint user equipment (UE) clustering and RIS assignment/alignment approach that ensures the power reception
Ertugrul Basar (10963540), Abdulkadir Celik (8035232), Recep Akif Tasci (13434814), Fatih Kılınç (13346157), Ahmed Eltawil (9319968), Asmaa Abdallah (13434817)   +5 more
core   +1 more source

RIS-Based Steerable Beamforming Antenna with Near-Field Eigenmode Feeder

, 2022
We present a novel, power and hardware efficient, antenna system leveraging the eigenmodes of the over-the-air propagation matrix from an active multi-antenna feeder (AMAF) to a large reflective intelligent surface (RIS), both configured as standard ...
Krishan Kumar Tiwari (14039289), Giuseppe Caire (14039418), Caire, Giuseppe, Tiwari, Krishan K.   +3 more
core   +1 more source

The graphene application for the Reconfigurable Intelligent Surface (RIS) design for the NOMA-RIS-MIMO system. Phenomenological view.

, 2023
The material is dedicated to various aspects of graphene metasurface implementation of the Reconfigurable Intelligent Surface (RIS) in the framework of the incoherent paradigm for NOMA-RIS-MIMO transmission design.
Valeri Kontorovich (12091406)
core   +1 more source