Systems and methods for adaptively-tuned digital self-interference cancellation
First Claim
Patent Images
1. A system for adaptively-tuned digital self-interference cancellation comprising:
- a transmit coupler, communicatively coupled to an analog transmit signal of a transmitter of a communications system, that samples the analog transmit signal to create a sampled analog transmit signal;
an analog self-interference canceller that generates an analog self-interference cancellation signal from the sampled analog transmit signal;
a receive coupler, communicatively coupled to an analog receive signal of a receiver of the communications system, that combines the analog self-interference cancellation signal with the analog receive signal, therefore reducing self-interference in the analog receive signal; and
a digital self-interference canceller that generates a digital self-interference cancellation signal from a digital transmit signal of the communications system, the digital self-interference canceller comprising;
a component generation system that generates a first set of self-interference cancellation signal components from the digital transmit signal;
a first multi-rate filter that, according to a transform configuration, combines the first set of self-interference cancellation signal components to generate the digital self-interference cancellation signal; and
a transform adaptor that updates the transform configuration;
wherein the digital self-interference cancellation signal is combined with a digital receive signal to form a digital residue signal;
wherein the digital self-interference canceller generates a composite residue signal, non-identical to the digital residue signal, from the digital residue signal and the digital transmit signal;
wherein the transform adaptor updates the transform configuration based on the composite residue signal.
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Abstract
A method for adaptively-tuned digital self-interference cancellation includes generating a digital self-interference cancellation signal from a digital transmit signal based on a transform configuration; combining the digital self-interference cancellation signal with a receive signal to form a digital residue signal; generating a composite residue signal from the digital residue signal and the digital transmit signal; and updating the transform configuration based on the composite residue signal.
316 Citations
21 Claims
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1. A system for adaptively-tuned digital self-interference cancellation comprising:
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a transmit coupler, communicatively coupled to an analog transmit signal of a transmitter of a communications system, that samples the analog transmit signal to create a sampled analog transmit signal; an analog self-interference canceller that generates an analog self-interference cancellation signal from the sampled analog transmit signal; a receive coupler, communicatively coupled to an analog receive signal of a receiver of the communications system, that combines the analog self-interference cancellation signal with the analog receive signal, therefore reducing self-interference in the analog receive signal; and a digital self-interference canceller that generates a digital self-interference cancellation signal from a digital transmit signal of the communications system, the digital self-interference canceller comprising; a component generation system that generates a first set of self-interference cancellation signal components from the digital transmit signal; a first multi-rate filter that, according to a transform configuration, combines the first set of self-interference cancellation signal components to generate the digital self-interference cancellation signal; and a transform adaptor that updates the transform configuration; wherein the digital self-interference cancellation signal is combined with a digital receive signal to form a digital residue signal;
wherein the digital self-interference canceller generates a composite residue signal, non-identical to the digital residue signal, from the digital residue signal and the digital transmit signal;
wherein the transform adaptor updates the transform configuration based on the composite residue signal.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification