TD(98)013

Abstract
This paper extends the work of TD(97)066 to examine the application of what is there termed the "spatial model" (see TD(97)014) to wideband channel modelling, for which more detailed information regarding the structure of the power-delay profile is required.  We model the arrival of multipath components within the power-delay profile as a Poisson process, in a similar manner to TD(97)064 and find an expression for the Poisson parameter in terms of the scatterer density. We show that it is a function of the excess delay of the component, and hence that the inter-arrival time is not constant.  We find also the mean amplitude of the components as a function of excess delay.  We also consider the averaged power-delay profile, in comparison to some measurements. In particular we show that some difficulties arise in evaluating the delay-spread if a simple power law is assumed for propagation.  Hence we introduce a propagation law with breakpoint, and evaluate the delay-spread in a particular case.