Analysis of foliage effects on mobile propagation in dense urban environments

Attempts to reduce the interference level and to increase the spectral effi ciency of cellular radio communication systems operating in dense urban and suburban areas lead to the microcellular approach with a consequent requir ement to lower antenna heights. In large metropolitan areas having high bui ldings this requirement causes a situation where the transmitting and recei ving antennas are both located below the rooftops, and the city street acts as a type of a waveguiding channel for the propagating signal. In this wor k, the city street is modeled as a random multislit waveguide with randomly distributed regions of foliage parallel to the building boundaries. The st atistical propagation characteristics are expressed in terms of multiple ra y - fields approaching the observer. Algorithms for predicting the path - l oss along the waveguide and for computing the transverse field structure ar e presented.