Pilot signal reception level averaging system

The pass band characteristic of an averaging filter is controlled in accordance with a predicted bandwidth occupied for a propagation loss fluctuation that is obtained by a propagation loss fluctuation bandwidth prediction unit. For the prediction of the propagation loss fluctuation bandwidth, the fluctuation rate of the levels at which a pilot signal is received is measured by a mobile station, in addition to the radius of a cell and the height of an antenna. The pass band of the averaging filter is broadened upon the prediction that the faster the pilot signal reception level fluctuates and the smaller the cell radius is, the faster the propagation loss fluctuates.