Results 31 to 40 of about 13,243 (227)
, 2010 This paper experimentally investigates and compares the performance of the free space optics system employing three different modulation schemes, on-off keying (OOK) with nonreturn- to-zero (NRZ) and return-to-zero (RZ) and the binary phase shift keying (
Z. Ghassemlooy +12 more
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Phase Offset Tracking for Free Space Digital Coherent Optical Communication System
Applied Sciences, 2019 The coherent receiving method can improve the sensitivity of an optical signal receiver for free space optical communication system effectively. To implement coherent receiving, the phase offset between the local laser in the receiver and the received ...
Hongwei Li +5 more
doaj +1 more source
Ibn Al-Haitham Journal for Pure and Applied Sciences, 2023 : The power and the size of the final spot of the laser beam reaching the target are very important requirements in most of the laser applications and fields such as medical, military, and scientific, so studying laser propagation in the atmosphere is a ...
Thair Abdulkareem Khalil Al-Aish +1 more
doaj +1 more source
Effect of Prandtl's ration on balance in geophysical turbulence
, 2015 Support for this research has come from the UK Engineering and Physical Sciences Research Council (grant no. EP/H001794/1).The fluid dynamics of the atmosphere and oceans are to a large extent controlled by the slow evolution of a scalar field called ...
McKiver, William Joseph +1 more
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Decaying grid turbulence in a rotating stratified fluid [PDF]
, 2006 Rotating grid turbulence experiments have been carried out in a stably stratified fluid for relatively large Reynolds numbers (mesh Reynolds numbers up to 18000).
Praud, Olivier +2 more
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The effect of atmospheric turbulence on the performance of the free space optical communications [PDF]
, 2008 In free space optical (FSO) communication links, atmospheric turbulence has a significant impact on the quality of a laser beam propagating through the atmosphere.
Ghassemlooy, Zabih +7 more
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Experimental verification of the limits of optical channel intensity reciprocity
, 2012 Optical data links through the atmosphere suffer from turbulence-induced signal scintillation. In a coaxially-symmetric bidirectional link scenario, the variations of the axial intensities at both ends are correlated.
Cowley, William +7 more
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Coherent optical binary polarisation shift keying heterodyne system in the free-space optical turbulence channel [PDF]
, 2011 In this paper, analytical and simulation results for the bit error rate (BER) performance and fading penalty of a coherent optical binary polarization shift keying (2PolSK) heterodyne system adopted for a free space optical (FSO) communication link ...
Z. Ghassemlooy +12 more
core +1 more source
Object Recognition in Atmospheric Turbulence Scenes
2023 31st European Signal Processing Conference (EUSIPCO), 2023 The influence of atmospheric turbulence on acquired surveillance imagery poses significant challenges in image interpretation and scene analysis. Conventional approaches for target classification and tracking are less effective under such conditions. While deep-learning-based object detection methods have shown great success in normal conditions, they ...
Disen Hu, Nantheera Anantrasirichai
openaire +3 more sources
, 2010 This paper reports experimental results for the performance of an free space optical (FSO) communication link employing different modulation schemes under the influence of the atmospheric scintillation.
Z. Ghassemlooy +13 more
core +1 more source