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      •   BUIR Home
      • University Library
      • Bilkent Theses
      • Theses - Department of Electrical and Electronics Engineering
      • Dept. of Electrical and Electronics Engineering - Master's degree
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      Propagation simulation for outdoor wireless communications in urban areas

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      Author(s)
      Yılmaz, Özgür
      Advisor
      Altıntaş, Ayhan
      Date
      2002
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      A propagation simulation of wireless communication for urban environments is aimed. Firstly, propagation path loss from a base station to a receiver point was calculated according to Walfisch-Ikegami model which is an empirical model based on the measurement data. Building database around the base station was used to calculate the path losses. Outdoor regions between buildings were divided into grid points and path losses are calculated as if there is a receiver at a given grid point. For a given radiated power from the base station, received power was obtained at each grid point. Visual output of the received power distribution was plotted. Results were compared with the Walfisch-Ikegami implementation of a commercial software called Winprop. Almost identical power distribution was observed. Secondly, ray tracing model of Winprop was used for the same area. Assuming ray tracing model gives more accurate results, situations for which Walfisch-Ikegami model better approaches to ray tracing model were found. Coherence bandwidth were obtained by using the impulse response produced by the ray tracing model.
      Keywords
      propagation simulation
      path loss
      Walfisch-Ikegami model
      ray tracing
      coherence bandwidth
      wireless systems
      Permalink
      http://hdl.handle.net/11693/15841
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      • Dept. of Electrical and Electronics Engineering - Master's degree 654
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