Method and apparatus for relayed communication using band-pass signals for self-interference cancellation
First Claim
1. A method for providing self-interference cancellation in two-way relayed electromagnetic communication between a first device and a second device through a relay station comprising the steps of:
- generating at said first device a modulated near signal;
transmitting said modulated near signal from said first device to said relay station;
receiving at said first device a composite signal from said relay station, said composite signal containing a relayed version of said modulated near signal and a relayed version of a modulated far signal transmitted from said second device;
providing said composite signal in a representation as a first interface signal to a canceler module of said first device;
providing a representation of said modulated near signal as a second interface signal to said canceler module, said second interface signal being of a frequency centered at or near a second interface frequency not at baseband;
canceling at said canceler module a portion of said relayed version of said modulated near signal from said representation of said composite signal using said second interface signal to a produce a cancellation-processed signal; and
outputting said cancellation-processed signal as a third interface signal from said canceler module.
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Accused Products
Abstract
Self-interference cancellation is provided in two-way relayed electromagnetic communication between a first device and a second device through a relay station wherein a representation of a relayed composite signal above baseband and a representation of a locally modulated interface signal above baseband interact to effect the self-interference cancellation. Specifically, the composite signal, which contains a relayed version of the locally modulated (near) signal from the first device and a relayed version of a modulated far signal from the second device, is received at the first device from the relay station. The composite signal is then provided in a representation as a first interface signal at a first frequency at or above baseband to a canceler module of the first device and a representation of the modulated near signal at a second frequency above baseband is provided as a second interface signal to the canceler module. Part of the relayed version of the modulated near signal is canceled from the representation of the composite signal using the representation of the modulated near signal as provided to the canceler module to produce a third interface signal as output at a third frequency at or above baseband. The first and second frequencies may or may not be the same.
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Citations
33 Claims
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1. A method for providing self-interference cancellation in two-way relayed electromagnetic communication between a first device and a second device through a relay station comprising the steps of:
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generating at said first device a modulated near signal;
transmitting said modulated near signal from said first device to said relay station;
receiving at said first device a composite signal from said relay station, said composite signal containing a relayed version of said modulated near signal and a relayed version of a modulated far signal transmitted from said second device;
providing said composite signal in a representation as a first interface signal to a canceler module of said first device;
providing a representation of said modulated near signal as a second interface signal to said canceler module, said second interface signal being of a frequency centered at or near a second interface frequency not at baseband;
canceling at said canceler module a portion of said relayed version of said modulated near signal from said representation of said composite signal using said second interface signal to a produce a cancellation-processed signal; and
outputting said cancellation-processed signal as a third interface signal from said canceler module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for retrofitting a first device for self-interference cancellation capability in two-way relayed electromagnetic communication between said first device and a second device through a relay station, said first device having an existing modulator unit, an existing transmitter equipment, an existing receiver equipment and an existing demodulator unit, said method comprising the steps of:
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providing a composite signal in a representation as a first interface signal from said receiver equipment to a canceler module of said first device, said composite signal containing a relayed version of a modulated near signal transmitted from said first device and a relayed version of a modulated far signal transmitted from said second device;
providing a representation of said modulated near signal as a second interface signal from said modulator unit to said canceler module, said second interface signal also provided to said transmitter equipment, said second interface signal being of a frequency centered at or near a second interface frequency not at baseband;
canceling at said canceler module a portion of said relayed version of said modulated near signal from said representation of said composite signal using said second interface signal to produce a cancellation-processed signal; and
outputting said cancellation-processed signal as a third interface signal from said canceler module to said receiver equipment. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for providing self-interference cancellation in two-way relayed electromagnetic communication between a first device and a second device through a relay station comprising the steps of:
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generating at said first device a modulated near signal;
transmitting said modulated near signal from said first device to said relay station;
receiving at said first device a composite signal from said relay station, said composite signal containing a relayed version of said modulated near signal and a relayed version of a modulated far signal transmitted from said second device;
providing said composite signal in a representation as a first interface signal to a canceler module of said first device;
providing a representation of said modulated near signal as a second interface signal to said canceler module, said second interface signal being of a frequency centered at or near a second interface frequency not at baseband;
canceling at said canceler module a portion of said relayed version of said modulated near signal from said representation of said composite signal using said second interface signal to a produce a cancellation-processed signal;
demodulating said cancellation-processed signal to produce at least one demodulated signal; and
outputting said at least one demodulated signal from said canceler module. - View Dependent Claims (32)
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33. A system for providing self-interference cancellation in two-way relayed electromagnetic communication between a first device and a second device through a relay station comprising:
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means for generating at said first device a modulated near signal;
means for transmitting said modulated near signal 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 a relayed version of said modulated near signal and a relayed version of a modulated far signal transmitted from said second device;
means for providing said composite signal in a representation as a first interface signal to a canceler module of said first device;
means for providing a representation of said modulated near signal as a second interface signal to said canceler module, said second interface signal being of a frequency centered at or near a second interface frequency not at baseband;
means for canceling at said canceler module a portion of said relayed version of said modulated near signal from said representation of said composite signal using said second interface signal to a produce a cancellation-processed signal; and
means for outputting said cancellation-processed signal as a third interface signal from said canceler module.
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Specification