SYSTEMS AND METHODS FOR FREQUENCY INDEPENDENT ANALOG SELFINTERFERENCE CANCELLATION
First Claim
Patent Images
1. A system for analog self-interference cancellation comprising:
- a transmit coupler, communicatively coupled to an RF transmit signal of a full-duplex wireless communication system, that samples the RF transmit signal to create a sampled RF transmit signal having an RF carrier frequency;
a frequency downconverter, comprising a mixer, a local oscillator, and an IF filter, wherein the frequency downconverter converts, by heterodyning, the sampled RF transmit signal to an IF transmit signal having an IF carrier frequency, wherein the IF carrier frequency is less than the RF carrier frequency;
an IF analog self-interference canceller, comprising a signal divider, first and second tunable filters, first and second scalers, first and second delayers, and a signal combiner, wherein the signal divider splits the IF transmit signal into first and second signal paths, the first tunable filter filters the first signal path to form a first IF transmit signal component and the second tunable filter filters the second filter path to form a second IF transmit signal component, the first scaler and first delayer scale and delay the first IF transmit signal component to create a first IF self-interference signal component, the second scaler and second delayer scale and delay the second IF transmit signal component to create a second IF self-interference signal component, and the signal combiner combines the first and second IF self-interference signal components to form an IF self-interference signal;
a frequency upconverter comprising a mixer, a local oscillator, and an RF filter, wherein the frequency upconverter converts, by heterodyning, the IF self-interference signal to an RF self-interference signal having the RF carrier frequency; and
a receive coupler, communicatively coupled to an RF receive signal of the full-duplex wireless communication system, that combines the RF self-interference signal with the RF receive signal.
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Abstract
A system and method for analog self-interference cancellation that includes receiving an RF transmit signal of a full-duplex radio; frequency downconverting the RF transmit signal to an IF transmit signal; transforming the IF transmit signal into an IF self-interference signal using an IF analog self-interference cancelling circuit; frequency upconverting the IF self-interference signal to an RF self-interference signal; and combining the RF self-interference signal with an RF receive signal of the full-duplex radio.
60 Citations
20 Claims
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1. A system for analog self-interference cancellation comprising:
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a transmit coupler, communicatively coupled to an RF transmit signal of a full-duplex wireless communication system, that samples the RF transmit signal to create a sampled RF transmit signal having an RF carrier frequency; a frequency downconverter, comprising a mixer, a local oscillator, and an IF filter, wherein the frequency downconverter converts, by heterodyning, the sampled RF transmit signal to an IF transmit signal having an IF carrier frequency, wherein the IF carrier frequency is less than the RF carrier frequency; an IF analog self-interference canceller, comprising a signal divider, first and second tunable filters, first and second scalers, first and second delayers, and a signal combiner, wherein the signal divider splits the IF transmit signal into first and second signal paths, the first tunable filter filters the first signal path to form a first IF transmit signal component and the second tunable filter filters the second filter path to form a second IF transmit signal component, the first scaler and first delayer scale and delay the first IF transmit signal component to create a first IF self-interference signal component, the second scaler and second delayer scale and delay the second IF transmit signal component to create a second IF self-interference signal component, and the signal combiner combines the first and second IF self-interference signal components to form an IF self-interference signal; a frequency upconverter comprising a mixer, a local oscillator, and an RF filter, wherein the frequency upconverter converts, by heterodyning, the IF self-interference signal to an RF self-interference signal having the RF carrier frequency; and a receive coupler, communicatively coupled to an RF receive signal of the full-duplex wireless communication system, that combines the RF self-interference signal with the RF receive signal. - View Dependent Claims (2, 3, 4)
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5. A system for analog self-interference cancellation comprising:
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a transmit coupler, communicatively coupled to an RF transmit signal of a full-duplex wireless communication system, that samples the RF transmit signal to create a sampled RF transmit signal having a first RF carrier frequency; a frequency downconverter that converts the sampled RF transmit signal to an IF transmit signal having an IF carrier frequency, wherein the IF carrier frequency is less than the first RF carrier frequency; an IF analog self-interference canceller that transforms the IF transmit signal to an IF self-interference signal; a frequency upconverter that converts the IF self-interference signal to an RF self-interference signal having a second RF carrier frequency; and a receive coupler, communicatively coupled to an RF receive signal of the full-duplex wireless communication system, that combines the RF self-interference signal with the RF receive signal. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method for analog self-interference cancellation comprising:
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receiving an RF transmit signal of a full-duplex radio; frequency downconverting the RF transmit signal to an IF transmit signal; transforming the IF transmit signal into an IF self-interference signal using an IF analog self-interference cancelling circuit; frequency upconverting the IF self-interference signal to an RF self-interference signal; and combining the RF self-interference signal with an RF receive signal of the full-duplex radio. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification