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Konu "Turbulence" için Elektronik ve Haberleşme Mühendisliği Bölümü listeleme

Konu "Turbulence" için Elektronik ve Haberleşme Mühendisliği Bölümü listeleme

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  • Analysis of wave structure functions 
    Eyyuboğlu, Halil T. (IEEE, 2008)
    Wave structure function (WSF) of spherical wave is used in extended Huygens-Fresnel integral to induce the effect of turbulent atmosphere on the propagating laser beam. Depending on the approximation made and the choice ...
  • BER evaluations for multimode beams in underwater turbulence 
    Altay Arpalı, Serap; Baykal, Yahya; Arpalı, Çağlar (Taylor&Francis Ltd., 2016)
    In underwater optical communication links, bit error rate (BER) is an important performance criterion. For this purpose, the effects of oceanic turbulence on multimode laser beam incidences are studied and compared in terms ...
  • Bit error rates for focused general-type beams 
    Altay Arpalı, Serap; Baykal, Yahya (Electromagnetics Acad, 2009)
    Using the scintillation index of general beam formulation, bit error rate (BER) is investigated for focused Gaussian, cos-Gaussian, cosh-Gaussian and annular beams in weak atmospheric turbulence. We have employed our ...
  • Correction of amplitude distortions for truncated Bessel beam and SER estimation for 4ASK 
    Eyyuboğlu, Halil T. (Taylor&Francis Ltd., 2016)
    We apply amplitude corrections to a truncated Bessel beam that has propagated through turbulent atmosphere modelled by random phase screens. These corrections are realized via transmitting an unmodulated beam in parallel ...
  • Estimation of aperture averaged scintillations in weak turbulence regime for annular, sinusoidal and hyperbolic Gaussian beams using random phase screen 
    Eyyuboğlu, Halil T. (Elsevier Science Ltd, 2013-11)
    Using the random phase screen method, aperture averaged scintillations for annular, sinusoidal and hyperbolic Gaussian beams are estimated. Prior to this estimation, the designed random phase screen setup is tested against ...
  • Laguerre-Gaussian beam scintillation on slant paths 
    Yüceer, Mehmet; Eyyuboğlu, Halil T. (Springer, 2012-11)
    Scintillation evaluations for Laguerre-Gaussian (LG) beams for slant paths are made using Rytov approximation. On- and off-axis scintillation is formulated and calculated up to several tens of kilometers of slant distances ...
  • Propagation factor of partially coherent flat-topped beam array in free space and turbulent atmosphere 
    Yuan, Yangsheng; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya; Chen, Jun (Elsevier Science Ltd, 2012-05)
    Analytical expressions for the propagation factor of partially coherent radial flat-topped (FT) beam array in free-space and turbulent atmosphere are derived. Our formulae can be applied to study the beam propagation factors ...
  • Propagation of an Airy beam through the atmosphere 
    Ji, X.L.; Eyyuboğlu, Halil T.; Ji, Guangming; Xiaoling, Ji (Optical Soc Amer, 2013-01-28)
    In this paper, the effect of thermal blooming of an Airy beam propagating through the atmosphere is examined, and the effect of atmospheric turbulence is not considered. The changes of the intensity distribution, the ...
  • Propagation of Hermite-cosh-Gaussian laser beams in turbulent atmosphere 
    Eyyuboğlu, Halil T. (Elsevier Science BV, 2005-01-17)
    The propagation characteristics of Hermite-cosh-Gaussian (HCG) beams in turbulence are studied. To this end, from a HCG source plane excitation, the average intensity of the receiver plane is developed analytically. This ...
  • Scintillation behavior of Airy beam 
    Eyyuboğlu, Halil T. (Elsevier Science Ltd, 2013-04)
    We make an analysis on scintillation behavior of Airy beam using the Rytov method. To this end, scintillation index is formulated for a single receiver coordinate location. Area scintillation expressions are also derived. ...
  • Scintillation index of higher-order cos-Gaussian, cosh-Gaussian and annular beams 
    Altay Arpalı, Serap; Eyyuboğlu, Halil T.; Baykal, Yahya (Taylor&Francis LTD, 2008)
    In this paper, via the generalized beam formulation, we evaluate the scintillation index for higher-order general beams propagating through the weak atmospheric turbulence. The investigated higher-order beam types are ...
  • Structure functions for optical wave propagation in underwater medium 
    Ata, Yalçın; Baykal, Yahya (Taylor&Francis Ltd, 2014-04-03)
    The features of the wave structure function (WSF) derived for spherical excitation in turbulent water are investigated. It is found that as the rate of the dissipation of turbulent kinetic energy e decreases, WSF increases. ...
  • The performance bounds of an optical communication system using irradiance profile modulation 
    Eyyuboğlu, Halil T. (Taylor&Francis, 2017)
    We assess the performance bounds of an optical communication system that uses irradiance profile modulation. This modulation is based on the four different orders of vortex beams. To this end, we find the turbulence induced ...