Computation of Frequency Average Power Density Based on the TLM Method

This paper investigates an efficient approach to propagation modeling based on statistical phase averaging and thus not considering interference. Such methodology is appropriate whenever the modeled scenery is large compared to the wavelength and when it is characterized dominantly by multi-path propagation. Unless the illuminating source has zero bandwidth it can be expected that no interference pattern appears on the wavelength scale since field intensities vary strongly with frequency. In such cases it is often sufficient to obtain information about the field power density averaged over the signal bandwidth rather than the instantaneous field values. Neglecting wavelength scale interference and thus dropping local phase information, however, can considerably save computational cost in space discretizing numerical field computation.