1. A method implemented in a wireless communication system, comprising: accessing, in a computer system, information that characterizes a scattering environment proximate a mobile unit and information indicating a configuration of a plurality of antennas; generating, in the computer system, a three-dimensional scattering cloud model using said information, the three-dimensional scattering cloud model representing the scattering environment as seen by the plurality of antennas; and determining, in the computer system, at least one correlation between portions of signals received at the plurality of antennas using the three-dimensional scattering cloud model, wherein determining said at least one correlation comprises determining at least one of a temporal correlation of portions of a time series of the signal, a spatial correlation between portions of the signal, and a polarization correlation between portions of the signal.