Satellite communication system and method of cancelling interference in the satellite communication system
AssigneeElectronics and Telecommunications Research Institute
InventorJoon Gyu Ryu
Life of this patent
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Abstract
A satellite communication system and a method of cancelling interference in the satellite communication system are disclosed. The method of cancelling interference in the satellite communication system may include receiving a signal by a central station from a terminal via a satellite transponder, estimating, from the signal, a nonlinear characteristic associated with a central station signal transmitted from the central station, and cancelling an interference signal from the signal using the estimated nonlinear characteristic.
Claims17
A method of cancelling interference in a satellite communication system, the method comprising:
- receiving, by a central station, a signal from a terminal via a satellite transponder;
- estimating, from the received signal, a nonlinear characteristic associated with a central station signal transmitted from the central station;
- and
- cancelling an interference signal from the signal using the estimated nonlinear characteristic,
- wherein a frequency band of the signal comprises a frequency band allocated to a re-input signal to be re-input to the central station through the satellite transponder receiving the central station signal, and a frequency band allocated to a terminal signal to be transmitted to the central station from the terminal.
A method of cancelling interference in a satellite communication system, the method comprising:
- receiving an overlapping signal to be transmitted to a central station of the satellite communication system via a satellite transponder through a first frequency band;
- estimating, from the overlapping signal, a nonlinear characteristic associated with a central station signal;
- generating an interference signal for the overlapping signal using the estimated nonlinear characteristic;
- and
- cancelling the generated interference signal from the overlapping signal,
- wherein, when the central station signal is transmitted to at least one terminal from the central station via the satellite transponder through a second frequency band comprised in the first frequency band, the estimating of the nonlinear characteristic comprises:
- estimating the nonlinear characteristic using an intermediate frequency (IF) band signal using an IF band in the central station signal and a re-input signal to be re-input to the central station by the satellite transponder receiving the central station signal.
A satellite communication system, comprising:
- a receiver configured to receive a signal by a central station from a terminal via a satellite transponder;
- an estimator configured to estimate, from the received signal, a nonlinear characteristic associated with a central station signal transmitted from the central station;
- and
- a canceller configured to cancel an interference signal from the signal using the estimated nonlinear characteristic,
- wherein the estimator is configured to add the estimated nonlinear characteristic to an intermediate frequency (IF) band signal using an IF band in the central station signal, and the canceller is configured to demodulate the signal by performing at least one of symbol timing recovery (STR), carrier frequency offset (CFO) measurement, and phase tracking, and specify the interference signal to be cancelled by further adding, to the IF band signal, signal information associated with at least one of a timing error, a frequency error, and a phase error generated through the demodulating of the signal.
Dependencies are inferred from the claim text.