DSpace@Çankaya

Başlık için Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu listeleme

Başlık için Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu listeleme

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  • Active laser radar systems with stochastic electromagnetic beams in turbulent atmosphere 
    Cai, Yangjian; Korotkova, Olga; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2008-09-29)
    Propagation of stochastic electromagnetic beams through paraxial ABCD optical systems operating through turbulent atmosphere is investigated with the help of the ABCD matrices and the generalized Huygens-Fresnel integral. ...
  • Adaptive Optics Correction of Scintillation in Underwater Medium 
    Baykal, Yahya (Taylor&Francis LTD, 2020-02-06)
    Adaptive optics correction of the scintillation index of a Gaussian laser beam in underwater turbulence is studied. To introduce the adaptive optics correction, filter functions providing the piston, tilt and astigmatism ...
  • Airy-type relativistic matter wave 
    Umul, Yusuf Ziya (2021-12)
    A new relativistic Airy-type matter wave is introduced as a solution of the kinetic energy based wave equation. The parametric solution of the related differential equation is obtained. The total energy and momentum of the ...
  • Alternative interpretation of the edge-diffraction phenomenon 
    Umul, Yusuf Ziya (Optical Soc Amer, 2008-03)
    An alternative interpretation of the phenomenon of edge diffraction is proposed according to a new separation of the Fresnel function. The subfields are investigated in the problem of diffraction of a plane wave by a ...
  • An analysis on radius of curvature aspects of hyperbolic and sinusoidal Gaussian beams 
    Eyyuboğlu, Halil T.; Ji, Xiaoling (Springer, 2010-10)
    The effective radius of curvature of hyperbolic and sinusoidal Gaussian beams in free space and turbulent atmosphere is studied analytically and numerically. It is shown that the radius of curvature rises with growing ...
  • An analytical solution for the plane wave diffraction by a resistive half-plane residing at the interface of left and right handed media 
    Başdemir, Hüsnü Deniz (Elsevier GMBH, 2019-08)
    The diffraction of waves by a resistive half-plane lying on the interface of left and right handed media is investigated in this study. Because of the anomalous refraction property of left handed media, shadow boundary ...
  • An investigation of hydrogen bonded neutral B4Hn (n=1-11) and anionic B4H11(-1) clusters: Density functional study 
    Böyükata, Mustafa; Özdoğan, Cem; Güvenç, Ziya B. (Elsevier Science, 2007-03-28)
    In this study, detailed analysis of the structural stability of hydrogen bonded four-atom boron clusters within the framework of density functional theory (DFT) is presented. Effects of the number of hydrogen atoms on the ...
  • An isolated word speaker recognition system 
    Özaydın, Selma (IEEE, 2017)
    The paper presents a design of an isolated word speaker recognizer system by using the Hidden Markov Model. HTK toolkit is used as a design tool. The system is operated on a closed set of speakers and with a limited ...
  • An online adaptive cooperation scheme for spectrum sensing based on a second-order statistical method 
    Yarkan, Serhan; Töreyin, Behçet Uğur; Qaraqe, Khalid A.; Çetin, A. Enis (IEEE-Inst Electrical Electronics Engineers Inc, 2012-02)
    Spectrum sensing is one of the most important features of cognitive radio (CR) systems. Although spectrum sensing can be performed by a single CR, it is shown in the literature that cooperative techniques, including multiple ...
  • Analog and digital filter design 
    Gazi, Orhan (2018)
    In this chapter, we will study analog and digital filter design techniques. A filter is nothing but a linear time invariant (LTI) system. Any LTI system can be described using its impulse response. If the impulse response ...
  • Analysis of delay factors for voice over WiMAX 
    Şafak, A.; Preveze, B. (IEEE, 2008)
    This paper presents the results of our computer simulation for delays experienced by voice packets over WiMAX 802.16e protocol running over an enterprise packet network connected to public internet. In the simulation we ...
  • Analysis of flat-topped Gaussian vortex beam scintillation properties in atmospheric turbulence 
    Elmabruk, Kholoud; Eyyuboğlu, Halil T. (Spie-Soc Photo-Optical Instrumentation Engineers, 2019-06)
    We analyze the scintillation properties of a flat-topped Gaussian vortex beam propagating in a weakly turbulent atmosphere. We utilize a random phase screen model to perform this analysis. We evaluate the scintillation ...
  • 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 ...