Güncel Gönderiler: Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu

  • 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 ...
  • 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 ...
  • Incoherent sinusoidal-Gaussian and annular beam scintillations 
    Baykal, Yahya; Eyyuboğlu, Halil T.; Cai, Yangjian (Spie-Int Soc Optical Engineering, 2008)
    The scintillation index is evaluated in horizontal turbulent atmospheric optical links for incidences of incoherent cosh-Gaussian (IChG), cos-Gaussian (ICG) and annular (IA) beams. Weak turbulence solution is obtained for ...
  • 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 ...
  • Design of irregularly shaped patch antennas by using the multiport network model 
    Şener, Göker; Alatan, Lale; Kuzuoğlu, Mustafa (IEEE, 2008)
  • 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 ...
  • Review On The Modified Theory of Physical Optics 
    Başdemir, Hüsnü Deniz (IEEE, 2018)
    In this review, modified theory of physical optics approach to the diffraction problem is revisited. The important aspects of the method are explained and steps for the usage of the method are revealed. Also, historical ...
  • Beam wander of dark hollow, flat-topped and annular beams 
    Eyyuboğlu, Halil T.; Çil, Celal Zaim (Springer Heidelberg, 2008-11)
    Benefiting from the earlier derivations for the Gaussian beam, we formulate beam wander for dark hollow (DH) and flat-topped (FT) beams, also covering the annular Gaussian (AG) beam as a special case. Via graphical ...
  • Rubinowicz transform of the MTPO surface integrals 
    Umul, Yusuf Ziya (Elsevier Science BV, 2008-12-01)
    The surface integral of the modified theory of physical optics is reduced to a line integral by using the Rubinowicz transform for the incident scattered fields by an arbitrary aperture in a black surface. The integral ...
  • 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 ...
  • Use of matrix pade approximation in the analysis of ırregularly shaped patch antennas with multiport network model 
    Şener, Göker; Alatan, Lale; Kuzuoğlu, Mustafa (IEEE, 2009)
    A new procedure for implementing the multiport network model for analyzing two-dimensional microwave circuits is proposed. The proposal procedure leads to more efficient evaluation of impedance matrices than the procedure ...
  • Propagation of optical flat-topped gaussian beams in satellite links 
    Kamacıoğlu, Canan; Altay Arpalı, Serap; Baykal, Yahya; Yazgan, Erdem (IEEE, 2009)
    Propagation of optical flat-topped Gaussian beams in earth-satellite optical communication links is investigated where part of the link is turbulent atmosphere. Flat-topped Gaussian source field is obtained by superposing ...
  • Effect of beam types on the scintillations: A review 
    Baykal, Yahya; Eyyuboğlu, Halil T.; Cai, Yangjian (Spie-Int Soc Optical Engineering, 2009)
    When different incidences are launched in atmospheric turbulence, it is known that the intensity fluctuations exhibit different characteristics. In this paper we review our work done in the evaluations of the scintillation ...
  • Average received intensity for optical beam of arbitrary field profile after propagation in turbulent atmosphere 
    Arpalı, Çağlar; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2009)
    Employing our previously obtained formulation of the average received intensity for arbitrary optical beam in turbulent atmosphere, intensity patterns of already known and new source profiles are obtained. Arbitrary beam ...
  • Collision free row column s-random interleaver 
    Gazi, Orhan; Yılmaz, A. Özgüer (IEEE-INST Electrical Electronics Engineers INC, 2009-04)
    Parallel decodable turbo codes (PDTCs) are suitable for concurrent decoding and hence have low latency. Memory collision issue is an important problem met during parallel processing. In this article, we propose a collision ...
  • Local decision making and decision fusion in hierarchical levels 
    Beldek, Ulaş; Leblebicioğlu, Kemal (Springer, 2009-07)
    Hierarchical problem solving is preferred when the problem is overwhelmingly complicated. In such a case, the problem should better be analyzed in hierarchical levels. At each level, some temporary solutions are obtained; ...
  • Throughput maximisation of different signal shapes working on 802.16e mobile multihop network using novel cognitive methods 
    Preveze, Barbaros; Şafak, Aysel (Springer-Verlag Berlin, 2010)
    This study proposes cognitive methods for managing the multimedia packet traffic of 802.16e system providing the dynamic spectrum sharing by TDM & OFDMA under heavy traffic conditions. The cognitive techniques are used in ...
  • Diffraction properties of partially coherent elegant high-order beam 
    Wang, Fei; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Electromagnetics Acad, 2010)
    The diffraction properties of a partially coherent elegant higher-order beam in free space are investigated in detail. It is found that the diffraction properties of a partially coherent elegant higher-order beam upon ...
  • Scintillations in weak turbulence of annular beams whose individual components are incoherent 
    Baykal, Yahya; Eyyuboğlu, Halil T.; Cai, Y. (Electromagnetics Acad, 2010-03-22)
    The scintillation index, arising from the intensity fluctuations in weak atmospheric turbulence of annular beams whose individual components are incoherent, is formulated. For such beams whose annularities are obtained by ...
  • The implementation of a successive cancellation polar decoder on xilinx system generator 
    Arlı, A. Çağrı; Çolak, Ayşe; Gazi, Orhan (IEEE, 2017)
    Polar coding is the first kind of the capacity achieving codes which are defined for binary-input discrete memoryless channels initially. Parallel processing property of the FPGA allows to decode faster with a margin of ...