Abstract: This study presents an investigation on the diffraction loss due to knife-edge obstruction in a mountainous environment at 1.8 GHZ using Olumo rock as a case study. The method employed here involved measurement of the power received for line of sight, no line of sight, line of sight distance from the test base station to the test point, the distance from the mobile to the test point. Computation of the diffraction loss, diffraction angle and the normalized dimensionless quantity V using Fresnel model was done for the purpose of comparisons. The results obtained shows that for a diffraction angle between -20 to -8°, a linear equation can sufficiently describe the diffraction loss while the diffraction loss for angle between -9 to 0° can be modeled with a sixth order polynomial equation.
T.L. Adebayo and F.O. Edeko , 2007. Investigation and Modeling of Diffraction Loss at 1.8 GHZ in a Mountainous Terrain: A Case Study of Olumo Rock, Abeokuta, Nigeria. Research Journal of Applied Sciences, 2: 60-64.