Propagation prediction based on environmental classification and fuzzy logic approximation

The classical Okumura-Hata and Walfisch-Ikegami propagation models (which provide the foundation of today´s land-mobile communication services) are examined and the path loss characteristics are represented as an equation of a straight line. It is shown that the intercept and the slope of the straight line can be approximated by means of environmental classifications and fuzzy logic approximations. A linguistic rule is presented to characterize an unknown propagation environment from the set of known environments. It is further shown that there is a unique set of design parameters for which the propagation is independent of the environment where fuzzy logic approximations may be applied. Conditions for multipath attenuation and waveguide effects are also shown