Results 21 to 30 of about 86,758,594 (170)
MOBILE OPTICAL HIGH-SPEED DATA LINKS WITH SMALL TERMINALS [PDF]
, 2009 Mobile Optical Free-Space Communication (MFSO) downlinks from observation platforms in low earth orbit or in the atmosphere will allow nearly undetectable high-speed data links with small and low-power laser communication terminals.
Giggenbach, Dirk, D. Giggenbach
core +1 more source
Optical Free-Space Communication on Earth and in Space regarding Quantum Cryptography Aspects [PDF]
, 2010 Mobile FSO Communication links have gained signi cant at- tention over the last years due to their increasing maturity. They are used in point to point link scenarios where the high gain in power efficiency and datarate is crucial, compared to state-of ...
Fuchs, Christian +3 more
core +1 more source
Modeling of ADS-B data transmission via satellite
Aviation, 2013 For modelling transmission of ADS-B messages via low-orbit satellite constellation Iridium, the original model of a communication channel “Aircraft-to-Satellite-to-Ground Station” was built using MATLAB Simulink.
Volodymyr Kharchenko +2 more
doaj +1 more source
Delay-Aware Satellite-Terrestrial Backhauling for Heterogeneous Small Cell Networks
IEEE Access, 2020 This paper investigates a satellite-terrestrial backhaul framework to enhance efficient data offloading for heterogeneous terminals, including delay-sensitive and delay-tolerant users.
Zhe Ji, Suzhi Cao, Sheng Wu, Wenbo Wang
doaj +1 more source
Results of the Optical Downlink Experiment KIODO from OICETS Satellite to Optical Ground Station Oberpfaffenhofen (OGS-OP) [PDF]
, 2007 Optical LEO downlinks from the Japanese OICETS to the optical ground station built by the German Aerospace Center (DLR) near Munich have been performed. This was the first optical LEO downlink on European grounds.
Perlot, Nicolas +13 more
core +1 more source
Analysis of X-Band Link Performance Degradation Caused by Adjacent Satellite [PDF]
Journal of Astronomy and Space Sciences, 2011 As more satellites are designed to downlink their observed image data through the X-band frequency band, it is inevitable that the occupied bandwidth of a target satellite will overlap with that of other X-band downlink satellites. For sun-synchronized
Durk-Jong Park +3 more
doaj +1 more source
Dynamic Downlink Interference Management in LEO Satellite Networks Without Direct Communications
IEEE Access, 2023 We investigate effective interference management for Low Earth Orbit (LEO) satellite networks that provide downlink services to ground users and share the same frequency spectrum range.
Jihyeon Yun +5 more
doaj +1 more source
PhotonicsSecurity is paramount in space–air–ground integrated networks (SAGINs) due to their inherent openness and the broadcast characteristics of wireless transmission. In this paper, we propose a secure downlink transmission scheme with NOMA-based mixed FSO/RF
Yu Li +4 more
doaj +1 more source
Photonics, 2022 By analyzing the effect of the degree of polarization (DoP) of the partially coherent Gaussian Schell-model (GSM) beam on a heterodyne system of an uplink path and a downlink path, we developed an innovative and noteworthy theory according to which σsy ...
Zhenkun Tan +4 more
doaj +1 more source
International Journal of Satellite Communications and Networking, EarlyView.ABSTRACT Low Earth Orbit (LEO) satellite constellations offer unprecedented opportunities for global broadband connectivity but pose significant beamforming challenges due to rapid platform motion and stringent onboard hardware constraints. Fully digital architectures, while optimal in theory, remain impractical for satellite payloads, motivating ...
Mohammad Momani +2 more
wiley +1 more source