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Proper Closed-form Representation for Site-specific Radio-wave Propagation

Sadrearhami, Mohammad Hossein | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 52165 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Shishegar, Amir Ahmad
  7. Abstract:
  8. In this dissertation, a proper closed-form representation has been presented for the site specific indoor radio-wave propagation. Characteristic Green’s function (CGF) technique is used to obtain the integral representation of the Green’s function of a rectangular 2D room with dielectric slab walls. Based on numerical simulations, this method provide quite accurate results for wave propagation in the interior region (away from the walls) but the error increases for source or field points near the walls. The presented integral form of Green’s function has slow convergence and computed using Real images, complex images and rational function fitting methods. An error of less than 20 percent is achieved for all methods. Implementing the Method of Moments (MoM) in conjunction with this Green’s, indoor wave propagation in the presence of complex obstacles can be solved. Cagniard-de Hoop methods and the frequency domain Green’s function are combined to present the time-domain Green’s function of a rectangular empty room. This solution is very complicated and time consuming. To analyze the propagation problems, a simpler approximate approach which needs much less time and provides sophisticated results are presented. Furthermore,Green’s function of 3D room with dielectric slab walls is computed. Based on aforementioned Green’s function of empty room, three distinct models are presented for the wave propagation in typical indoor environments. Characteristics of these methods are investigated and best method for the closed-form representation of wave propagation is selected. Simulation results show that error of less tahn 10 percent is achieved for indoor propagation modelling
  9. Keywords:
  10. Ray Tracing ; Indoor Radio Wave Propagation ; Charactristic Green's Function (CGF)

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