Characterisation of mobile radio signals: model description

Following a brief review of multipath propagation models, the major characteristics of mobile radio signals are determined using an adaptation of the generic three-dimensional model proposed by Aulin (1979). The various multipath component waves, which have equal amplitude and random, uniformly-distributed phase are allowed to have spatial angles of arrival with both vertical and horizontal components. The spatial angle of arrival in the horizontal plane is assumed to be uniformly distributed in the interval (0, 2 pi ) but a new PDF is proposed for the vertical angle of arrival, beta . The effective scatterers are assumed to form a cylinder around the mobile with a radius and height that depends on the maximum value beta _m of the vertical angle of arrival. Suitable values for beta _m are estimated from published experimental results. The limitations of two-dimensional scattering models are illustrated by considering not only the power spectral density, but also the cross correlation between antennas spatially separated in the vertical plane.<>