Systems and methods for cancelling interference using multiple attenuation delays
First Claim
1. A wireless communication device comprising:
- at least one antenna for receiving or transmitting a signal;
a cancellation circuitry adapted to receive a first sample of a transmit signal, said cancellation circuitry comprising;
a control block;
a subtractor;
N paths, each path comprising a delay element and an associated variable attenuator whose attenuation level varies in response to the control block, each path receiving the first sample of the transmit signal and generating a delayed and weighted version of the first sample of the transmit signal;
wherein a delay element disposed in a first one of the N paths generates a delay shorter than a self-interference arrival time, and wherein a delay element disposed in a second one of the N paths generates a delay longer than the self-interference arrival time;
wherein the self-interference arrival time is a delay between arrival of a second sample of a transmit signal at the cancellation circuitry and arrival of a corresponding self-interference signal at the subtractor;
wherein the corresponding self-interference signal comprises self-interference resulting from transmission of the second sample of the transmit signal;
a combiner adapted to combine the N delayed and weighted versions of first sample of the transmit signal to construct a signal representative of a first portion of a self-interference signal;
wherein the subtractor is adapted to subtract the constructed signal from a received signal, wherein N is an integer greater than or equal to 2.
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Accused Products
Abstract
A wireless communication device includes, in part, at least one antenna for receiving or transmitting a signal, and a cancelation circuit adapted to cancel or reduce the self-interference signal. The cancelation circuit includes, in part, a control block, N delay and attenuation paths, a combiner, and a subtractor. Each path includes a delay element and a variable attenuator whose attenuation level varies in response to a control signal generated by the control block. Each path receives a sample of the transmit signal and generates a delayed and attenuated (weighted) version of the sample signal. The combiner combines the N delayed and weighted versions of the sample signal to construct a signal representative of the self-interference signal. The subtractor subtracts the constructed signal from the received signal thereby the cancel or reduce the self-interference signal therefrom.
101 Citations
26 Claims
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1. A wireless communication device comprising:
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at least one antenna for receiving or transmitting a signal; a cancellation circuitry adapted to receive a first sample of a transmit signal, said cancellation circuitry comprising; a control block; a subtractor; N paths, each path comprising a delay element and an associated variable attenuator whose attenuation level varies in response to the control block, each path receiving the first sample of the transmit signal and generating a delayed and weighted version of the first sample of the transmit signal;
wherein a delay element disposed in a first one of the N paths generates a delay shorter than a self-interference arrival time, and wherein a delay element disposed in a second one of the N paths generates a delay longer than the self-interference arrival time;
wherein the self-interference arrival time is a delay between arrival of a second sample of a transmit signal at the cancellation circuitry and arrival of a corresponding self-interference signal at the subtractor;
wherein the corresponding self-interference signal comprises self-interference resulting from transmission of the second sample of the transmit signal;a combiner adapted to combine the N delayed and weighted versions of first sample of the transmit signal to construct a signal representative of a first portion of a self-interference signal; wherein the subtractor is adapted to subtract the constructed signal from a received signal, wherein N is an integer greater than or equal to 2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of canceling or reducing a self-interference signal, the method comprising:
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receiving a first sample of a transmit signal at a receiver; generating N delayed versions of the first sample of the transmit signal; attenuating the N delayed signals to generate N attenuated and delayed signals; combining the N attenuated and delayed signals to generate a combined signal representative of a first portion of a self-interference signal; subtracting the combined signal from a received signal; setting a first delay, corresponding to a first one of the N delayed versions of the first sample of the transmit signal, to a value less than a self-interference arrival time; and setting a second delay, corresponding to a second one of the N delayed versions of the first sample of the transmit signal, to a value greater than the self-interference arrival time; wherein the self-interference arrival time is a delay between arrival of a second sample of a transmit signal at the cancellation circuitry and arrival of a corresponding self-interference signal at the subtractor;
wherein the corresponding self-interference signal comprises self-interference resulting from transmission of the second sample of the transmit signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification