A Unified Hollow-Disk Scattering Model: Angle-of-Departure and Time-of-Arrival Statistics

Authors

• Almir Maric
  • Department of Telecommunications, University of Sarajevo, Sarajevo, Bosnia and Herzegovina
• Enio Kaljic
  • Department of Telecommunications, University of Sarajevo, Sarajevo, Bosnia and Herzegovina
• Mesud Hadzialic
  • Department of Telecommunications, University of Sarajevo, Sarajevo, Bosnia and Herzegovina

Abstract

In order to ensure the required wireless communication system performances, it is necessary to have an efficient communication channel model, which is capable of considering all channel degradation factors fairly. In this paper, a unified hollow-disk geometrically-based stochastic channel model is derived. This model assumes that the scatterers are distributed in hollow-disk area around mobile station. Namely, the scatterer distribution is derived as a projection of d-dimensional uniformly distributed scatterers into 2-dimensional space. According to this generalization, derived model is capable of obtaining uniform circular, uniform ring, uniform hollow-disk, unified disk scattering model as special cases, as well as modeling a whole new group of hollow-disk models. Under assumption of single bounce scattering and omnidirectional antennas at transmitter and receiver, joint PDF of angle-of-departure and angle-of-arrival, as well as the joint PDF of time-of-arrival and angle-of-arrival are derived. Subsequently, the corresponding marginal PDFs are provided in closed form. Thus, derived PDFs are suitable for any position of base station, (base station places inside or outside of scattering region). Proposed model is validated by several measured channels. The curve fitting results shown the high flexibility of the proposed model and outperforming results compared to several other geometric scattering models.