Stochastic model of scattering component distribution in outdoor propagation environment

A stochastic scatter model in mobile radio channels is proposed that has three features: (1) the effective scattering area is expressed by an ellipse the center of which is the mobile station (MS) location; (2) the major axis of the ellipse runs parallel along the street where the MS is located; (3) the scattering power density function around the MS is expressed by a combination of two Laplacian distributions in which the standard deviations are different. To verify the proposed model and obtain realistic values for the model parameters, we measured the spatio-temporal path data observed at a base station (BS), using a 2.2 GHz band in a macrocell scenario (BS antenna height is 60 m) in a typical urban area. The scattering positions are detected from the path information, assuming a single bounce. In addition to those observed from the above-mentioned ellipse, the results showed that the effective major and minor radii of the ellipse are approximately 210 m and 120 m, respectively, where the axis ratio is approximately 1.7. Furthermore, the power profiles that are projected for each axis of the ellipse can be approximated as Laplacian distributions. Finally, simplification of the proposed model is discussed.