Unified Approach to Predict of LOS Characteristics in the Urban Microcellular Environments

Abstract

This work presents experimental results carried out by the communication group of Tadiran Ltd., as well as, theoretical predictions obtained both by Bertoni et al. [1, 2] and Tadiran's group [3, 4] for the estimation of the effectiveness of the MultiGain Wireless Local Loop (MWLL) system developed by Tadiran for use in urban areas with regularly distributed rectangular rows of buildings, when both base station antenna and the radio port antenna are at the street level below the rooftops. The experiments are examined in different propagation conditions: Line-of-Sight (LOS) along the street level, and obstructed (" clutter") conditions, when both the antennas are placed in the environment with strong shadowing surrounding them. To predict these experimental conditions, in the first case a model of 3D-multislit impedance waveguide (earlier developed for the 2D and 3D case of perfectly conductive waveguide in [3]) is proposed to estimate the path loss at the street level and at the street intersections [4], respectively. For the second case the 2D-model of multidiffraction from the building roofs according to [1, 2] is used in conjunction with actual variations of building heights, the distances between them and the actual base station antenna height variations. The contributions in path loss is obtained to predict the experimentally observed coverage effects and the microcell shape for MGWLL systems in urban and suburban areas with regularly distributed rows of buildings and rectangularly crossing streets.