2、Time dispersion3、Impairments of the Wireless Channel 1、Four Basic Propagation Mechanisml FadingLarge-scale path loss and shadowingSmall-scale fadinglRadio Propagation Model“. characterization of radio wave propagation as a function of frequency, distance and other conditions.”l General ray-tracing method (simulation)Multiple ray-tracing with propagation effects (reflection, diffraction, LOS path, scattering, etc)Might consider building material (steel, concrete, brick, etc)l Empirical methodOn
