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Browsing Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu by Title

Browsing Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu by Title

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  • Analysis of laser multimode content on the angle-of-arrival fluctuations in free-space optics access systems 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Soc Photo-Optical Instrumentation Engineers, 2005-05)
    The effects of laser beam multimode content on the angle-of-arrival fluctuations are examined for free-space optics (FSO) access systems. Multimode excitation is represented by coherent addition of Hermite-Gaussian modes. ...
  • Analysis of parallel decodable turbo codes 
    Gazi, Orhan (IEICE-INTS Electronics Information Communications Eng, 2012-05)
    Turbo codes suffer from high decoding latency which hinders their utilization in many communication systems. Parallel decodable turbo codes (PDTCs) are suitable for parallel decoding and hence have low latency. In this ...
  • Analysis of reciprocity of cos-Gaussian and cosh-Gaussian laser beams in a turbulent atmosphere 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2004-10-04)
    In a turbulent atmosphere, starting with a cos-Gaussian excitation at the source plane, the average intensity profile at the receiver plane is formulated. This average intensity profile is evaluated against the variations ...
  • 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 ...
  • Angle-of-arrival fluctuations for general-type beams 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Soc Photo-Optical Instrumentation Engineers, 2007-09)
    Starting with the recently introduced phase correlation function of a general-type beam, the angle-of-arrival fluctuations are derived and evaluated in atmospheric turbulence for lowest-order Gaussian, cos-Gaussian, ...
  • Annular beam scintillations in non-Kolmogorov weak turbulence 
    Gerçekçioğlu, Hamza; Baykal, Yahya (Springer, 2012-03)
    In a weakly turbulent atmosphere governed by the non-Kolmogorov spectrum, the on-axis scintillation index is formulated and evaluated when the incidence is an annular Gaussian type. When the power law of the non-Kolmogorov ...
  • Annular beam scintillations in strong turbulence 
    Gerçekçioğlu, Hamza; Baykal, Yahya; Nakiboğlu, Cem (Optical Soc Amer, 2010-08)
    A scintillation index formulation for annular beams in strong turbulence is developed that is also valid in moderate and weak turbulence. In our derivation, a modified Rytov solution is employed to obtain the small-scale ...
  • Annular, cosh and cos Gaussian beams in strong turbulence 
    Eyyuboğlu, Halil T. (Springer, 2011-06)
    For the strong atmospheric turbulence regime, the asymptotic on-axis scintillation behavior of annular, cosh and cos Gaussian beams is theoretically derived and illustrated with numerical examples. It is observed from the ...
  • Aperture averaging in multiple-input single-output free-space optical systems 
    Gökçe, Muhsin Caner; Baykal, Yahya; Uysal, Murat (Optical Soc Amer, 2016-06-01)
    Multiple-input single-output (MISO) techniques are employed in free-space optical (FSO) links to mitigate the degrading effects of atmospheric turbulence. In this paper, for the MISO FSO system, a partially coherent radial ...
  • Aperture averaging in multiple-input single-output free-space optical systems 
    Gökçe, Muhsin Caner; Baykal, Yahya; Kamacıoğlu, Canan; Uysal, Murat (Spie-Soc Photo-Optical Instrumentation Engineers, 2015-06)
    Multiple-input single-output systems are employed in free-space optical links to mitigate the degrading effects of atmospheric turbulence. We formulate the power scintillation as a function of transmitter and receiver ...
  • Aperture Averaging of Focused Multi-Gaussian Beams 
    Kamacıoğlu, Canan; Baykal, Yahya; Yazgan, Erdem (Electromagnetics Acad, 2013)
    We investigate the behavior of the power fluctuations of the focused annular and flat-topped beams when a realistic receiver possessing a finite sized aperture is employed in turbulent atmospheric optics links. Employing ...
  • Apertured averaged scintillation of fully and partially coherent Gaussian, annular Gaussian, flat toped and dark hollow beams 
    Eyyuboğlu, Halil T. (Elsevier Science Bv., 2015-03-15)
    Apertured averaged scintillation requires the evaluation of rather complicated irradiance covariance function. Here we develop a much simpler numerical method based on our earlier introduced semianalytic approach. Using ...
  • Apertured paraxial Bessel beams 
    Umul, Yusuf Ziya (Optical Soc Amer, 2010-03)
    The paraxial Bessel beam is obtained by applying an approximation in the wavenumbers. The scattering of the beams by a circular aperture in an absorbing screen is investigated. The scattered fields are expressed in terms ...
  • Application of equivalent structure constant in scintillations and BER found for non-Kolmogorov spectrum 
    Baykal, Yahya; Gerçekçioğlu, Hamza (Elsevier Science Bv, 2014-01-01)
    The evaluation of system parameters in the non-Kolmogorov turbulent atmosphere involves the structure constant valid at the relevant non-Kolmogorov power law exponent. In some of the existing results, the comparisons of ...
  • Application of the complex point source method to the Schrodinger equation 
    Umul, Yusuf Ziya (Elsevier Science Ltd, 2010-11)
    The paraxial wave equation is a reduced form of the Helmholtz equation. Its solutions can be directly obtained from the solutions of the Helmholtz equation by using the method of complex point source. We applied the same ...
  • Application of the Method of Transition Boundary To the Half-Planes With Mixed Boundary Conditions 
    Umul, Yusuf Ziya (Elsevier GMBH, 2020-03)
    The scattering problems of waves by soft-hard and hard-soft half-planes are investigated by the method of transition boundary. The functional values at the transition boundaries are found to be identical to the ones for ...
  • Applications of Cognitive Radio Networks: Recent Advances and Future Directions 
    Kim, Sung W.; Pan, Miao; Joshi, Gyanendra Prasad; Gazi, Orhan; He, Jianhua; Coupechoux, Marceau (Sage Publications LTD, 2016)
  • Arbitrary laser beam propagation in free space 
    Arpalı, Çağlar; Baykal, Yahya; Nakiboğlu, Cem (Elsevier Science, 2009-08-15)
    The propagation of arbitrary laser beams in free space is examined. For this purpose, starting with an incident field of arbitrary field distribution, the intensity at the receiver plane is formulated via Huygens Fresnel ...
  • Area scintillations of Bessel Gaussian and modified Bessel Gaussian beams of zeroth order 
    Eyyuboğlu, Halil T. (Springer, 2010-01)
    As an extension of our previous study, the area scintillation aspects of Bessel Gaussian and modified Bessel Gaussian beams of zeroth order are investigated. The analysis is carried out on the basis of equal source sizes ...
  • Atmospheric Propagation Model and Affecting On Laser Beam Propagation Via Free Space 
    Khamees, Hussein T. (OSA - The Optical Society, 2017)
    In this article, a laser source (He-Ne) laser with maximum output power ( 2.95 mW) was used to study and analyze laser beam when the laser propagates through the atmosphere. Atmosphere layer, also the spot diameter of the ...