Patent ID: 8625659

Claim:
A system for pre-distorting a signal, the system comprising: a plurality of subscriber terminals located within a subscriber spot beam of a multi-beam satellite, each of the plurality of subscriber terminals configured to: receive a first spot beam signal transmitted from a gateway device via the multi-beam satellite; buffer a digitized representation of the first wireless spot beam signal comprising a sequence of symbols; decode the sequence of symbols to recover a set of data; regenerate a version of the transmitted first wireless spot beam signal from the recovered set of data; compare a first spectral estimate for the buffered sequence of symbols to a second spectral estimate generated from the regenerated version of the first spot beam signal to create comparison data, the spectral estimates identifying signal amplitudes and phases at each of a plurality of analysis frequencies; and transmit the comparison data to the gateway device; and the gateway device, in communication with the plurality of subscriber terminals via the multi-beam satellite, and configured to: receive the comparison data from of the plurality of subscriber terminals; schedule transmissions to a first subset of subscriber terminals of the plurality of subscriber terminals in a second spot beam signal to be transmitted to the plurality of subscriber terminals; and pre-distort the second spot beam signal based at least in part on the received comparison data from the first subset of subscriber terminals to compensate for frequency responses of signals transmitted to the first subset plurality of subscriber terminals, and wherein the pre-distortion is based on an average of received comparison data and excludes the received comparison data from a second subset of subscriber terminals of the plurality of subscriber terminals when the scheduled transmissions of the second spot beam signal are not directed at the second subset of subscriber terminals.