Patent ID: 6675013
Filing Date: 2004-01-06
Classification: H04B

Abstract:
A method of factoring out signal errors in both forward and reverse links, each including a feeder link and a user link, in a cellular communications system including an airborne repeater, comprising:receiving a reverse link pilot reference signal in a band similar to a communications signal band; correcting for Doppler shift in the reverse link based on the reverse link pilot reference signal; correcting for the Doppler shift in the forward link based on the reverse link pilot reference signal prior to the forward link being affected by the Doppler shift by pre-compensating for forward link path losses due to movement of the airborne repeater to cause communications signals transmitted from the airborne repeater via the forward link to have substantially uniform strength; and wherein the correcting for the Doppler shift in the forward link comprises shifting the forward link prior to transmission thereof to provide coverage to a predetermined geographic area.