Results 101 to 110 of about 18,596 (191)
Downlink optimization for direct-to-satellite IoT with LEO satellites and LoRaWAN
International audiencenetworks a b s t r a c t Direct-to-satellite communication systems for the Internet of Things, particularly those based on low-Earth-orbit satellite constellations, are emerging as a transformative solution to achieve global ...
Delahaye, Daniel +3 more
core +2 more sources
PhotonicsSatellite-based QKD is currently being developed to revolutionize global cryptographic key exchange by facilitating secure communication among remote parties at a global scale.
Aristeidis Stathis +5 more
doaj +1 more source
Feasibility of C‐Band Converged Satellite‐Fibre QKD Links Through Telescope‐to‐SMF Coupling
IET OptoelectronicsThis study presents a comprehensive feasibility analysis of low Earth orbit (LEO) satellite‐to‐ground downlink communication for quantum key distribution (QKD), focusing on 1550 nm wavelength.
Aristeidis Stathis +6 more
doaj +1 more source
IEEE AccessWith the advent of 6G systems, non-terrestrial networks (NTNs) are emerging as a cornerstone for global, uninterrupted connectivity. This study evaluates the downlink link budget in a dual-steering TN–NTN architecture, where an aerial user ...
Sara Sualiheen +2 more
doaj +1 more source
Frequency dissemination with free-space optical links
, 2010 Optical clock technology is very certain to be integrated in the next high precision time standards. The demand for higher accuracy in time synchronization makes the use of free-space optical links necessary for frequency dissemination, especially if ...
Mata Calvo, Ramon +2 more
core
An Efficient Design for Robust Downlink Power Control Using Worst-case Performance Optimization [PDF]
, 2009 Downlink power control and beamforming designs in wireless system have been a recent research focus. To achieve reliable and efficient designs, good estimation of wireless channel knowledge is desired. However, the presence of uncertain channel knowledge
Li, Huiping
core
The performances of satellite-to-ground downlink optical communications over Gamma–Gamma distributed turbulence are studied for a multiple-aperture receiver system.
Ma, Jing +4 more
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Development of nano-satellite - image processing module
, 2012 Velox-I is the premier nano-satellite being designed and built by the students of Nanyang Technological University and will be deployed into the Low Earth Orbit (LEO) in 2013. One of the objectives of the Velox-I mission is Earth observation. For this it
Kanika Bansal.
core
Store and Forward Communication Payload Design for LEO Satellite Systems
Majlesi Journal of Electrical EngineeringIn this paper design of Store and Forward (S and F) communication payload for a Sina-1satellite is presented. The S and F subsystem uses VHF and UHF radio links for receiving and transmitting messages. It provides digital communication facilities between
OICC Press Authors
doaj
Data Handling and Preservation for the TanDEM-X Satellite Mission
, 2009 The main purpose of TanDEM-X – a German SAR (Synthetic Aperture Radar) interferometric satellite mission – is to produce a world-wide consistent and reliable digital elevation model (DEM) with accuracy to the HRTI-3 (High-Resolution Terrain Information ...
Schwinger, Maximilian +3 more
core