Characterization of non-WSSUS fading dispersive channels

We present several novel tools for the statistical characterization of fading dispersive channels that do not satisfy the usual WSSUS assumption. A local scattering function, describing the timeand frequency-dependentaverage scatterer power, is introduced. Furthermore, a novel channel correlation function is presented that quantifies the scatterer correlation. Based on the channel correlation function, we introduce the practically important class of doubly underspread channels. Numerical results involving a simulated and a measured channel illustrate the usefulness of our framework.