Results 31 to 40 of about 22,297 (253)
Reconfigurable Intelligent Surfaces: Channel Characterization and Modeling
Proceedings of the IEEE, 2022 Reconfigurable intelligent surfaces (RISs) are two dimensional (2D) metasurfaces which can intelligently manipulate electromagnetic waves by low-cost near passive reflecting elements. RIS is viewed as a potential key technology for the sixth generation (6G) wireless communication systems mainly due to its advantages in tuning wireless signals, thus ...
Jie Huang +7 more
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Survey on reconfigurable intelligent surfaces below 10 GHz
EURASIP Journal on Wireless Communications and Networking, 2021 Reconfigurable intelligent surface (RIS) is a programmable structure that can be used to control the propagation of electromagnetic waves by changing the electric and magnetic properties of the surface.
Visa Tapio +4 more
doaj +1 more source
Reconfigurable Intelligent Surface Optimal Placement in Millimeter-Wave Networks
IEEE Open Journal of the Communications Society, 2021 This work discusses the optimal reconfigurable intelligent surface placement in highly-directional millimeter wave links. In particular, we present a novel system model that takes into account the relationship between the transmission beam footprint at ...
Konstantinos Ntontin +5 more
doaj +1 more source
Active Reconfigurable Intelligent Surface-Aided Wireless Communications
IEEE Transactions on Wireless Communications, 2021 Reconfigurable Intelligent Surface (RIS) is a promising solution to reconfigure the wireless environment in a controllable way. To compensate for the double-fading attenuation in the RIS-aided link, a large number of passive reflecting elements (REs) are conventionally deployed at the RIS, resulting in large surface size and considerable circuit power ...
Ruizhe Long +3 more
openaire +4 more sources
IEEE Open Journal of the Communications Society, 2021 Reconfigurable Intelligent Surface (RIS) has emerged as a promising technology in wireless networks to achieve high spectrum and energy efficiency. RIS typically comprises a large number of low-cost nearly passive elements that can smartly interact with ...
Baoling Sheen +3 more
doaj +1 more source
Over-the-air beamforming with reconfigurable intelligent surfaces
Frontiers in Communications and Networks, 2022 Reconfigurable intelligent surface (RIS)-empowered communication is a revolutionary technology that enables to manipulate wireless propagation environment via smartly controllable low-cost reflecting surfaces. However, in order to outperform conventional communication systems, an RIS-aided system with solely passive reflection requires an extremely ...
Zehra Yigit +2 more
openaire +4 more sources
Intelligent Metasurfaces with Continuously Tunable Local Surface Impedance for Multiple Reconfigurable Functions [PDF]
, 2019 Electromagnetic metasurfaces can be characterized as intelligent if they are able to perform multiple tunable functions, with the desired response being controlled by a computer influencing the individual electromagnetic properties of each metasurface ...
Kafesaki, Maria +9 more
core +4 more sources
Wireless Energy Harvesting for Autonomous Reconfigurable Intelligent Surfaces
IEEE Transactions on Green Communications and Networking, 2023 This work was supported by the Luxembourg National Research Fund (FNR) under the CORE project RISOTTI (ref. 14773976), the European Commission’s Horizon 2020 research and innovation programme (ARIADNE) under grant agreement No. 871464, and the Digital Futures center.
Konstantinos Ntontin +9 more
openaire +4 more sources
Exploiting Reconfigurable Intelligent Surface-Based Uplink/Downlink Wireless Systems
IEEE Access, 2022 This paper analyzes the performance of an uplink/downlink reconfigurable intelligent surface (RIS)-based wireless system with a multiple-antenna base station (B), where the RIS selection strategy is considered to alleviate the overhead and resources ...
Khac-Tuan Nguyen +2 more
doaj +1 more source
A new meta-module for efficient reconfiguration of hinged-units modular robots [PDF]
, 2016 We present a robust and compact meta-module for edge-hinged modular robot units such as M-TRAN, SuperBot, SMORES, UBot, PolyBot and CKBot, as well as for central-point-hinged ones such as Molecubes and Roombots.
Parada, Irene +2 more
core +1 more source