Kentsel Radyo Yayılımında Çoklu Kırınımlar için İyileştirilmiş Bir Algoritma Geliştirilmesi

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2009

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Department of Electrical & Electronics Engineering
Department of Electrical and Electronics Engineering (EE) offers solid graduate education and research program. Our Department is known for its student-centered and practice-oriented education. We are devoted to provide an exceptional educational experience to our students and prepare them for the highest personal and professional accomplishments. The advanced teaching and research laboratories are designed to educate the future workforce and meet the challenges of current technologies. The faculty's research activities are high voltage, electrical machinery, power systems, signal and image processing and photonics. Our students have exciting opportunities to participate in our department's research projects as well as in various activities sponsored by TUBİTAK, and other professional societies. European Remote Radio Laboratory project, which provides internet-access to our laboratories, has been accomplished under the leadership of our department with contributions from several European institutions.

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Bu tezde, çoklu bina yapılarında geçiş bölgesi kırınımları için Genel Kırınım Teorisine (GKT) dayalı kırınım algoritmaları özetlendi ve çoklu bina yapılarında elektrik alan tahmini için daha hızlı ve kesin sonuçlar veren daha gelişmiş bir GKT algoritması ileri sürüldü. Dışbükey zarf tekniğine dayalı eğim kırınımı modeli (EKDZ), Eğim kırınımı (EK) ve fresnel bölgesi kavramı üzerine kurulmuştur. Bu model karasal yayıncılıkta kapsama alanı kestiriminde de kullanılabilir. Bu tez ayrıca, GKT bazlı modelleri hesaplama süresi ve kesinlik için karşılaştırır. Üstelik, EK ve EKDZ modelleri, Kirchhoff-Huygens integrallerinin çözümü üzerine kurulan fiziksel optik modeli ile de karşılaştırılır. Daha hızlı ve kesin radio ağları planlaması yapmak için çok geniş çaptaki benzetimlerin sonuçları sunuldu ve tartışıldı.
This thesis presents a review of diffraction algorithms based on Uniform Theory of Diffraction (UTD) for multiple diffractions, and proposes an improved UTD model for fast and more accurate field prediction for multiple diffractions. The proposed model is based on the improved version of slope UTD and Fresnel zone concept, called slope UTD with convex hull. This model can be used for coverage prediction in terrestrial broadcasting systems. The thesis also provides a comparison for UTD based algorithms, and discusses the results for computation time and accuracy. Furthermore, slope UTD and slope UTD with convex hull models are compared with a Physical Optics (PO) solution based on numerical computation of Kirchhoff-Huygens integrals. Results of extensive simulations are presented, and discussed for the development of fast and accurate radio network planning tools.

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Elektrik ve Elektronik Mühendisliği, Elektromanyetik dalgalar, Electrical and Electronics Engineering, Electromagnetic waves, Elektromanyetik yayılma, Electromagnetic propagation

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86