Physical modeling of line-of-sight wideband propagation in a city street for microcellular communication

This paper proposes a three-dimensional (3D) spatial variant wideband multi-ray model for line-of-sight radio wave propagation in a city street. An analytical expression of the spatial variant channel transfer function is derived. The model provides 3D propagation information for both the base and mobile stations, e.g., direction of arrival, which makes it useful in antenna array applications. The developed model can be used to predict both wideband, e.g., angle and delay spread, and narrowband, e.g., path loss, propagation characteristics in a city street with any number of crossing streets of different widths. The proposed 3D wideband model is compared with an experimentally verified two-ray wideband model described in [18]. The model is easy to implement and fast to compute since there is no searching for coupling rays.