Geometric channel model for multipath propagation in city-street grids

For rectilinear streets in urban and suburban environments, two geometric channel models have been developed to characterize the street-guided propagation of broadband signals. When the coupling of signal power into cross streets is primarily via reflections from buildings, the Manhattan metric is used to define the propagation distance in the two-dimensional space. A tapped delay line model is thus implemented based on the generic framework proposed in previous work. We further study the effect of width of street blocks (W_st) and K-factor (K₀) on the power delay profile and root mean square delay spread of the channel. On the other hand, when diffraction around building corners is the dominant mechanism for signal propagation, hypothetical receivers are located at each street corner and giving rise to the propagation into the next street section. Multi-elliptical scattering model is suggested. We furthermore compare the channel characteristics of non-line-of-sight microcell propagation with those of line-of-sight propagation based on the proposed model.