Results 81 to 90 of about 353,289 (314)

Shaping spectral leakage for IEEE 802.11 p vehicular communications [PDF]

, 2014
IEEE 802.11p is a recently defined standard for the physical (PHY) and medium access control (MAC) layers for Dedicated Short-Range Communications. Four Spectrum Emission Masks (SEMs) are specified in 802.11p that are much more stringent than those for ...
Pham, Thinh H., Ian Vince McLoughlin, Suhaib A. Fahmy, McLoughlin, Ian Vince, Fahmy, Suhaib A., Thinh H. Pham   +5 more
core   +1 more source

Coupling of Er3+ ions and Plasmonic Modes in Vertical Nanocavities for Spectral Broadening in Telecom Bands

Advanced Materials Technologies, EarlyView.
Left: Illustration of the glass & nanostructures system and the NIR emission at 1.5 µm, where the colored spheres represent the Er3+ ions within the doped glass. Right: Representation of the Stark splitting of the 4I13/2 and 4I15/2 manifolds of the Er3+, illustrating how the plasmonic modes facilitate the emission from the broader Stark manifold ...
Gaston Lozano Calderón, Víctor Anthony García Rivera, Stéphan Cagnon, Souleymane Toubou Bah, Younès Messaddeq, Euclydes Marega Junior   +5 more
wiley   +1 more source

Hybrid automatic-repeat-reQuest systems for cooperative wireless communications

Hybrid-Automatic-Repeat-reQuest (H-ARQ) has become an indispensable technique in reliable communication systems. Hence, in this paper we review the state-of-art and investigate the performance of H-ARQ in the context of cooperative wireless ...
Ngo, Hoang Anh, Hanzo, Lajos
core   +1 more source

Biodegradable Wireless Soil Urea Sensor Using Metamaterial Perfect Absorber for Distributed Deployment in Precision Agriculture

Advanced Materials Technologies, EarlyView.
In this study, we propose a biodegradable wireless soil urea sensor for precision agriculture. The sensor's electromagnetic response varies depending on the urea concentration, allowing the measurement of relative soil urea concentrations by analyzing the time‐transient electromagnetic response.
Yu Tanaami, Ken Sakabe, Tetsuya Yarimizo, Yasutaka Murakami, Tetsuo Kan, Hiroaki Onoe   +5 more
wiley   +1 more source

A wearable functional electrical stimulation device with a movable electrode for motor point tracking

Frontiers in Bioengineering and Biotechnology
Functional electrical stimulation is widely applied in the rehabilitation of individuals with cerebrovascular disease or spinal cord injury but is limited by rapid muscle fatigue.
Yue Liu, Shin Ebihara, Masao Sugi, Hiroshi Yokoi, Hiroshi Yokoi, Yinlai Jiang, Yinlai Jiang   +6 more
doaj   +1 more source

Performance Evaluation of Distributed-Antenna Communications Systems Using Beam-Hopping

, 2005
Digital beamforming (DBF) techniques are capable of improving the performance of communications systems significantly. However, if the transmitted signals are conflicted with strong interference, especially, in the direction of the transmitted beams ...
Yang, L.-L., Zhu, J., Hu, H.
core  

Large Faraday Rotation in Liquid Crystals With Embedded Paramagnetic Ions (Cu2+, VO2+) at Room Temperature

Advanced Optical Materials, EarlyView.
Large Faraday rotation at room temperature is observed in thin films of discotic copper (Cu2+: 3d9) and vanadyl (VO2+: 3d1) enaminoketone complexes. The large Verdet constant originates from a high density of paramagnetic centers, metal‐ligand p−d hybridization and π orbitals involved in optical transitions (identified by DFT calculations), as well as ...
Karolina Łempicka‐Mirek, Adam Krówczyński, Mateusz Król, Nevill Gonzalez Szwacki, Paulina Rybak, Damian Pociecha, Paweł W. Majewski, Barbara Piętka, Jacek Szczytko   +8 more
wiley   +1 more source

Development and environmental validation of a compact EDFA with integrated LNA+HPA for satellite optical communications

Frontiers in Physics
The Japanese National Institute of Information and Communications Technology (NICT) plans to launch a 6U CubeSat into Low Earth Orbit (LEO) during the Japanese fiscal year 2025.
Alberto Carrasco-Casado, Koichi Shiratama, Dimitar Kolev, Hiroyuki Tsuji, Morio Toyoshima   +4 more
doaj   +1 more source

High speed train communications systems using free space optics

, 2010
In this work, we propose a broad-band free space optical (FSO) wireless communications system for high-speed trains. The system consists of optical transceivers positioned outside the train and along the railway track.
Ghassemlooy, Zabih, Paudel, Rupak, Rajbhandari, Sujan, Le Minh, Hoa, Iaz, M.   +4 more
core  

NEWSKY - A concept for NEtWorking the SKY for civil aeronautical communications

, 2006
In this paper, an overview of the NEWSKY project is given. This project is funded by the European Commission within the 6th framework program and will start in January 2007.
S. Scalise, Schnell, Michael, Scalise, Sandro, M. Schnell   +3 more
core   +1 more source