Yazar "Ayberkin, Doruk" seçeneğine göre listele

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    Application of of Ray Tracing Technique into S-UTD-CH Model
    (IEEE, 2015) Tabakcioglu, Mehmet Baris; Ayberkin, Doruk
    To make higher accuracy predictions having less computation complexity, lower computation time, a lot of electromagnetic wave propagation models are developed. These models are classified into two classes, ray tracing based and numerical models. Computation complexity, computation time and accuracy of prediction of numerical model are high. On the contrary, computation complexity and computation time of ray tracing based model is lower. There is a tradeoff between computation time and accuracy. To predict the relative path loss at the receiver accurately, all ray paths have to be determined. In this study, after giving some brief information about some ray tracing based propagation models ray tracing software will be explained.
  • Küçük Resim Yok
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    Application of S-UTD-CH Model into Multiple Dirraction Scenarios at 900 MHz
    (Electromagnetics Acad, 2014) Tabakcioglu, Mehmet Baris; Ayberkin, Doruk
    In this study, propagation prediction models based on ray tracing in coverage estimation for broadcasting systems are compared with respect to computation time and accuracy. Uniform Theory of Diffraction (UTD), Slope Diffraction (S-UTD) and Slope UTD with Convex Hull (S-UTD-CH) models are compared for computation time and propagation path loss. Moreover in this study, effects of transmitter height to relative path loss at the receiver are analyzed. S-UTD-CH model is optimum model with respect to computation time and relative path loss.
  • Küçük Resim Yok
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    Building Parameter Analysis with S-UTD-CH model in Multiple Diffraction
    (IEEE, 2015) Tabakcioglu, Mehmet Baris; Ayberkin, Doruk
    Electromagnetic wave propagation models are used in radio planning tool and coverage prediction. These models are based on ray tracing technique or numerical. Slope UTD with convex hull model is a model which has less computation time, higher accuracy of prediction and based on ray tracing technique. S-UTD-CH model is used in multiple diffraction due to that this model gives more accurate results in less computation time. Obstacles can be modelled as knife edge, wedge or cylinder in ultra-high frequencies. inner angle, structure type and relative permittivity constant and conductivity of obstacle and polarization type of electromagnetic wave change the relative path loss at the receiver. In the study, how building parameter changes the relative path loss is discussed.
  • Küçük Resim Yok
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    Comparison and Analyzing Propagation Models
    (IEEE Computer Soc, 2012) Tabakcioglu, Mehmet Baris; Ayberkin, Doruk; Cansiz, Ahmet
    This paper presents a study on a class of algorithms based on Uniform Theory of Diffraction (UTD) for multiple diffractions. S-UTD-CH model can be used for fast and more accurate field prediction for multiple diffractions in transition zone. An extensive simulation results for comparison of UTD based algorithms with respect to the computation time and accuracy was provided.
  • Küçük Resim Yok
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    Işın İzleme Tekniğinin Radyo Dalga Yayılım Modellerinde Kullanılması
    (2015) Ayberkin, Doruk; Tabakcıoğlu, Mehmet Barış
    Daha güvenilir, zaman açısından verimli ve kesinliği yüksek elektromanyetik dalga  şiddeti kestirimi yapmak için birçok yayılım modeli geliştirilmiştir. Bu modeller nümerik ve ışın izleme tekniği tabanlı olmak üzere iki kısımdır. Nümerik modellerin hesaplama zamanı ve kesinliği yüksektir. Buna karşın ışın izleme tekniği tabanlı modellerin hesaplama süresi daha kısadır. Vericiden çıkan ve alıcıda sonlanan tüm ışınların tespit edilmesi alıcı üzerindeki bağıl yol kaybının doğru hesaplanması için çok önemlidir. Bu çalışmada kısaca bazı yayılım modelleri hakkında bilgi verildikten sonra ışın izleme tekniği yazılımı açıklanacaktır ve karşılaştırmalar yapılacaktır.