System and Method for Digital Cancellation of Self-Interference in Full-Duplex Communications
First Claim
1. A method for execution by a full-duplex communications device, the method comprising:
- sampling a received signal to obtain a received digital signal corresponding to the received signal;
sampling a transmitted signal to obtain a transmitted digital signal corresponding to the transmitted signal;
estimating a channel distortion introducing self-interference in the received signal in accordance with the transmitted digital signal and the received digital signal; and
estimating the self-interference in the received digital signal according to the estimated channel distortion.
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Accused Products
Abstract
Embodiments are provided for cancelling self-interference in a full-duplex communications system. The cancellation includes using a digital cancellation stage in additional to analog cancellation. In an embodiment, a method by a full-duplex communications device includes sampling a received signal, wherein the sampling provides a received digital signal corresponding to the received signal. The method further includes sampling a transmitted signal, wherein the sampling provides a transmitted digital signal corresponding to the transmitted signal. A channel distortion introducing self-interference in the received signal is then estimated according to the transmitted digital signal and the received digital signal. The method further includes estimating the self-interference in the received digital signal according to the estimated channel distortion.
37 Citations
20 Claims
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1. A method for execution by a full-duplex communications device, the method comprising:
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sampling a received signal to obtain a received digital signal corresponding to the received signal; sampling a transmitted signal to obtain a transmitted digital signal corresponding to the transmitted signal; estimating a channel distortion introducing self-interference in the received signal in accordance with the transmitted digital signal and the received digital signal; and estimating the self-interference in the received digital signal according to the estimated channel distortion. - View Dependent Claims (2, 3, 4, 5)
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6. A method by a full-duplex communications device, the method comprising:
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sampling a transmitted signal from the full-duplex communications device; sampling a received signal at the full-duplex communications device; estimating channel characteristics for self-interference according to the sampled transmitted signal, the sampled received signal, and a model relating the received signal to the transmitted signal and the channel characteristics; and estimating the self-interference in the received signal according to the estimated channel characteristics. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A communications device for full-duplex communications, the communications device comprising:
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a transmitter chain configured to transmit a first signal; a receiver configured to receive a second signal; an antenna coupled to the transmitter chain and the receiver; a passive analog cancellation circuit positioned between the transmitter chain, receiver, and the antenna, and configured to reject the first signal from a reception path between the passive analog cancellation circuit and the receiver; and a digital cancellation circuit coupled to the receiver and the transmitter chain, and configured to sample the first signal and the second signal, and estimate self-interference in the sampled second signal according to the sampled first signal and an estimate of a distortion channel inside the communications device. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification