Results 91 to 100 of about 13,243 (227)

BER and outage probability of DPSK subcarrier intensity modulated free space optics in fully developed speckle. [PDF]

, 2009
In this paper a differential phase shift keying (DPSK) subcarrier intensity modulated (SIM) free space optical (FSO) link is considered in negative exponential atmospheric turbulence environment.
Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, Popoola, Wasiu O., Leitgeb, Erich, Ghassemlooy , Zabih   +4 more
core   +1 more source

Experimental Characterisation and Modelling of Atmospheric Fog and Turbulence in FSO

, 2013
Free space optical (FSO) communication uses visible or infrared (IR) wavelengths to broadcast high-speed data wirelessly through the atmospheric channel.
Ijaz, Muhammad
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Atmospheric chemistry and physics in the atmosphere of a developed megacity (London): an overview of the REPARTEE experiment and its conclusions [PDF]

, 2011
The REgents PARk and Tower Environmental Experiment (REPARTEE) comprised two campaigns in London in October 2006 and October/November 2007. The experiment design involved measurements at a heavily trafficked roadside site, two urban background sites and ...
Davies, Fay, Bloss, W.J., C. Martin, A.K. Benton (7604879), Williams, P., Bloss, W., Martin, D., Barlow, J. F., Harrison, Roy M., Bloss, W. J., C. N. Hewitt, Smith, S., Phillips, Gavin J, Beddows, D. C S, Martin, C., R. M. Harrison, A. K. Benton, K. Petersson, D. Martin (7128215), Beddows, David C. S., Langridge, J., D.E. Shallcross (7604900), Shallcross, D. E., E. Nemitz (7604912), C. Martin (2339041), Allan, J. D., Dall'Osto, Manuel, Barlow, Janet F, Petersson, K., Thorpe, Alistair J, Williams, P.I., Shallcross, Dudley E, H. Coe, Hewitt, C Nicholas, S. Smith (2840546), Beddrows, D.C.S., Allan, J. D.; id_orcid, C. Helfter, Williams, P, Allen, J, Beddows, D. C. S., E. Nemitz, B. Davison (7604891), White, I. R., C. Helfter (7604918), Coe, Hugh, Hewitt, C., J.D. Allan (7604870), S.J. Henshaw (7604897), Beddows, D., Jones, Roderic L., Williams, P. I.; id_orcid, Bloss, William; id_orcid, P.I. Williams (7579982), Dorsey, J., Harrison, R., Di Marco, C., White, Iain R, Nemitz, E., Davison, Brian, Barlow, J.F., Di Marco, C. F., F. Davies (7604909), Davies, F., J.R. Dorsey (7604873), Shallcross, D., Whitehead, J., Ball, S.M., Williams, P. I., Langford, B, Davison, B, F. Davies, Harrison, Roy M, Harrison, Roy; id_orcid, G. J. Phillips, Dunbar, Tyrone, Williams, Paul I, K. F. Petersson, J. Whitehead (2189998), J. M. Langridge, Allan, J.D., Ball, S., J. D. Allan, Langford, Ben, Henshaw, S., R.L. Jones (7190252), Hewitt, C. Nicholas, Jones, Roderick L, Ball, S. M., Whitehead, James, K.F. Petersson (7604894), M. Dall'Osto (7604861), Dorsey, J.R., Jones, R. L., Benton, A., Petersson, K, Gallagher, M., H. Coe (6702755), Hewitt, C. N., J. Whitehead, Shallcross, Dudley, DallOsto, Manuel, C.N. Hewitt (7604888), Allan, J., Petersson, K.F., B. Davison, A.J. Thorpe (7604867), Dorsey, James R, Gallagher, Martin W, D. C. S. Beddows, I.R. White (7604771), J. F. Barlow, Jones, R., Nemitz, Eiko, P. I. Williams, Dunbar, T, R. L. Jones, J.F. Barlow (7604903), C. F. Di Marco, J. R. Dorsey, Allan, James D, D. Martin, Peterson, K Fredrik, Davison, B., Thorpe, A. J., Thorpe, Alan J., Benton, A K, Jones, R.L., Di Marco, Chiara F, Nemitz, E.G., M. Gallagher (3803230), B. Langford, M. Gallagher, Beddows, David C S, M. Dall'Osto, Helfter, Carole, Dunbar, T., Bloss, William J., Bloss, William J, Henshaw, Stephen J, R.M. Harrison (7604858), G.J. Phillips (7604915), Hewitt, C.N., Ball, Stephen M, Coe, H., Gallagher, M.; id_orcid, Whitehead, John, A. J. Thorpe, S. Smith, Phillips, G.J., Beddows, D. C.S., Di Marco, C.F., Coe, H.; id_orcid, Dall'Osto, M, Henshaw, Stephen, Benton, A.K., Beddows, David; id_orcid, Benton, A. K., D.C.S. Beddows (7604864), Shallcross, D.E., Henshaw, S.J., S. M. Ball, Harrison, R. M., Henshaw, S. J., Dorsey, J. R., J.M. Langridge (7604876), Di Marco, Chiara F., Langridge, J.M., Helfter, C., Thorpe, A.J., S. J. Henshaw, White, I., T. Dunbar, S.M. Ball (7604882), Langridge, Justin M, Di Marco C.F. (7604921), W.J. Bloss (7604777), Phillips, G. J.; id_orcid, Langford, B., I. R. White, D. E. Shallcross, Barlow, Janet F., Langridge, J. M., Dall'Osto, M., Barlow, J., Harrison, R.M., Petersson, K. F., Martin, Damien, Smith, Steven, Ball, S, White, I.R., Phillips, G., Whitehead, J, W. J. Bloss, Beddows, D.C.S., Phillips, G. J., Thorpe, A., T. Dunbar (7604906), Martin, Claire, B. Langford (7604885)   +199 more
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Free-space optical communication employing subcarrier modulation and spatial diversity in atmospheric turbulence channel [PDF]

, 2008
An expression for the bit error rate of a multiple subcarrier intensity-modulated atmospheric optical communication system employing spatial diversity is derived. Spatial diversity is used to mitigate scintillation caused by atmospheric turbulence, which
Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, Allen, John, Popoola, W, Popoola, Wasiu O., Leitgeb, Erich, Gao, S, Gao, Steven, Allen, Joe, Ghassemlooy , Zabih   +9 more
core   +1 more source

MHD turbulence and heating of the open field-line solar corona [PDF]

, 2003
This paper discusses the possibility that heating of the solar corona in open field-line regions emanating from coronal holes is due to a nonlinear cascade, driven by low-frequency or quasi-static magnetohydrodynamic fluctuations.
Dmitruk, Pablo, Milano, L., Matthaeus, William H., Dmitruk, P., Milano, L. J., Matthaeus, W. H., Mullan, D. J., Oughton, Sean, S. Oughton, P. Dmitruk, W. H. Matthaeus, L. Milano, Oughton, S., D. J. Mullan   +13 more
core   +1 more source

Quantifying finite range plasma turbulence [PDF]

Turbulence is a highly non-linear process ubiquitous in Nature. The nonlinearity is responsible for the coupling of many degrees of freedom leading to an unpredictable dynamical evolution of a turbulent system.
Leonardis, Ersilia
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Modelling and simulation of turbulence in unsteady separated and suddenly-expanded flows [PDF]

, 2011
The scope of this PhD thesis is the simulation of turbulence in time-dependent, separated and suddenly-expanded channel flows. High-resolution and very high-order numerical methods have been employed in the framework of Implicit Large Eddy Simulation ...
Karantonis, Konstantinos
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Wavelength-diversity transmission for fading mitigation in the atmospheric optical communication channel

, 2006
Mitigation of index of refraction turbulence (IRT) effects is crucial in long-range atmospheric communication links. Diversity-transmission is one favorable way for fading compensation.
Perlot, Nicolas, Hennes Henniger, Giggenbach, Dirk, Nicolas Perlot, Brandon L. Wilkerson, Henniger, Hennes, Wilkerson, Brandon, Dirk Giggenbach   +7 more
core   +1 more source

Convective and Orographic Origins of the Mesoscale Kinetic Energy Spectrum

Geophysical Research Letters
The mesoscale spectrum describes the distribution of kinetic energy in the Earth's atmosphere between length scales of 10 and 400 km. Since the first observations, the origins of this spectrum have been controversial.
Salah Kouhen, Benjamin A. Storer, Hussein Aluie, David P. Marshall, Hannah M. Christensen   +4 more
doaj   +1 more source

Numerical simulations of beam propagation through optical turbulence for high-altitude platform crosslinks

, 2004
In this paper we introduce a simulation method for modelling clear-air atmospheric turbulence effects for long horizontal stratospheric paths. Divergence angles of several hundred microradians in combination with link distances up to 800 km require to ...
Perlot, Nicolas, Jüngling, Ralf, Giggenbach, Dirk, Horwath, Joachim   +3 more
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