Yazar "Tabakcioglu, Mehmet Baris" 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.
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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.
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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.
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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.
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    Medium Access Control Protocols for Wireless Sensor Networks with Ambient Energy
    (IEEE, 2016) Kosunalp, Selahattin; Tabakcioglu, Mehmet Baris
    Wireless sensor networks (WSNs) have recently been a popular research area with a broad range of applications. One of the most significant constraints of WSNs is energy limitation of sensor nodes. Therefore, energy-efficiency has been considered as primarily design criterion in many medium access control (MAC) protocols developed. In order to solve the issue of limited-energy sources, various recent protocols have focused on energy harvesting from surrounding environment, such as solar, wind and vibration energy, resulting in providing unlimited energy source. Ambient energy exhibits a characteristic of unlimited energy source but not available always due to environmental changes. The focus is now being placed on effective utilization of the time-varying ambient energy. This study aims to provide a review of recently proposed MAC protocols for energy-harvesting WSNs describing their operating principles and underlying features.