UHF wideband statistical model and simulation of mobile radio multipath propagation effects

Abstract

A local wideband statistical model is presented for UHF mobile multipath propagation. The complex echo-envelope statistics have been derived from 10 MHz wideband pulse soundings at 436 MHz over a large area in suburban and urban localities. In the proposed model, the effects of Doppler-induced RF phase shifts have been considered. Echo paths are shown to fit a Poisson distribution for the excess time delays, while the echo envelopes conform to Rayleigh fading statistics. Correlated scattering, evident from echo path clusters in time-delay and echo-amplitude correlation coefficients in neighbouring path delay bins, is shown to be significant for excess path time delays less than 0.3 μs. Disagreements observed for local and nonlocal scattering in different localities are discussed. The implementation of a wideband multipath simulator based on the statistical model is described. Digital computer simulation of DPSK is used as an illustrative example to demonstrate its usefulness.