Multi-channel self-interference cancellation method and apparatus for relayed communication

A system for providing self-interference cancellation in relayed electromagnetic communication between a first device and one or more other devices through a relay station, the system comprising:

• means for generating at said first device a plurality of near signals;
• means for simultaneously transmitting said near signals from said first device to said relay station;
• means for 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;
• means for 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
• means for combining said cancellation signals with said composite signal to produce a desired signal representing said relayed remote signals.