Patent ID: 7729657

Claim:
A method for reducing echo noise in satellite communications in which a first station communicates with at least one second station via a nonlinear satellite transponder, the method comprising the steps of: transmitting a transmit signal from the first station to the at least one second station, where the transmit signal contains at least one carrier; providing a replica of the transmit signal; distorting, at the first station, the replica of the transmit signal according to nonlinearities of the satellite transponder to provide a distorted replica of the transmit signal; determining, at the first station, a scaled, delayed, and frequency-shifted version of the distorted replica of the transmit signal to provide a compensated distorted replica of the transmit signal; and using, at the first station, the compensated distorted replica to represent the nonlinearities of the satellite transponder and reduce echo noise from a received aggregate signal received by the first station from the at least one second station via the satellite transponder; wherein the distorting step further comprises applying a block conversion to the transmit signal to form the distorted replica occupying a predetermined frequency range.