1. An apparatus for classifying radio channels in a cellular radio system characterized by: a receiver for receiving a signal in the cellular radio system, said signal received through a radio channel; and a computer associated with the receiver and configured to classify the radio channel by matching received signal characteristics determined from a channel impulse response measured for the received signal to a stored set of radio channel models comprising International Telecommunication Union (ITU) models or a subset thereof, and thereby determine which radio channel model in the set best corresponds to the received signal characteristics.