Patent ID: 6813476
Filing Date: 2004-11-02
Classification: H04B

Abstract:
A method for compensating for atmospheric fading in a communication system wherein signals are sent from a first earth station to a second earth station via a repeater above the atmosphere, without increasing power of the signals in said repeater, the method comprising:determining, at one or both of said earth stations, at various times, signal power of a received signal and a signal-to-noise ratio of a received signal; calculating the change in noise power spectral density at said earth station from that under clear sky conditions, wherein the difference in noise power spectral density is calculated using the signal power and signal-to-noise ratio at one of said earth stations and a constant, K, wherein K is calculated as the difference, in dB, between the received signal strength under clear sky conditions and a signal-to-noise ratio under clear sky conditions; calculating a downlink attenuation; calculating an uplink attenuation present at a sending one of said earth stations; and commanding a sending one of said earth stations to increase its transmit power by an amount to compensate for the uplink attenuation.