Patent ID: 6725017
Filing Date: 2004-04-20
Classification: H04B

Abstract:
A method for providing self-interference cancellation in relayed electromagnetic communication between a first device and one or more other devices through a relay station comprising the steps of:generating at said first device a plurality of near signals; simultaneously transmitting said near signals from said first device to said relay station; receiving at said first device a composite signal from said relay station, said composite signal containing relayed versions of said near signals and relayed versions of a plurality of remote signals transmitted from said one or more other devices, said composite signal having multiple frequency channels including one or more shared frequency channels, each said shared frequency channel being occupied by at least one of said relayed near signals and one of said relayed remote signals; selectively generating one or more cancellation signals, each said cancellation signal having a frequency band corresponding to one of said shared frequency channels, each said cancellation signal representing a phase-inverted version of the relayed near signal occupying said one of said shared frequency channels; and combining said cancellation signals with said composite signal to produce a desired signal representing said relayed remote signals.