Systems and methods for hybrid self-interference cancellation
First Claim
Patent Images
1. A system for hybrid self-interference cancellation comprising:
- a transmit coupler, communicatively coupled to an RF transmit signal of a 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 self-interference canceller that transforms the IF transmit signal to an IF self-interference cancellation signal;
a frequency upconverter that converts the IF self-interference cancellation signal to an IF-sourced RF self-interference signal;
an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal;
a receive coupler, communicatively coupled to an RF receive signal of the wireless communication system, that combines the RF self-interference cancellation signal and the IF-sourced RF self-interference cancellation signal with the RF receive signal;
a digital self-interference canceller that transforms a digital transmit signal of the wireless communication system to a digital self-interference cancellation signal; and
a delayer located in a signal path between the RF and IF self-interference cancellers and the digital self-interference canceller, wherein the delayer delays the RF self-interference cancellation signal and the IF-sourced RF self-interference cancellation signal.
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Abstract
A system for hybrid self-interference cancellation includes a transmit coupler that samples an RF transmit signal, a RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal, an IF self-interference canceller that transforms a downconverted version of the RF transmit signal to an ISRF self-interference cancellation signal, and a receive coupler that combines the RF and ISRF self-interference cancellation signals with an RF receive signal.
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Citations
18 Claims
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1. A system for hybrid self-interference cancellation comprising:
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a transmit coupler, communicatively coupled to an RF transmit signal of a 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 self-interference canceller that transforms the IF transmit signal to an IF self-interference cancellation signal; a frequency upconverter that converts the IF self-interference cancellation signal to an IF-sourced RF self-interference signal; an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal; a receive coupler, communicatively coupled to an RF receive signal of the wireless communication system, that combines the RF self-interference cancellation signal and the IF-sourced RF self-interference cancellation signal with the RF receive signal; a digital self-interference canceller that transforms a digital transmit signal of the wireless communication system to a digital self-interference cancellation signal; and a delayer located in a signal path between the RF and IF self-interference cancellers and the digital self-interference canceller, wherein the delayer delays the RF self-interference cancellation signal and the IF-sourced RF self-interference cancellation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for hybrid self-interference cancellation comprising:
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a transmit coupler, communicatively coupled to an RF transmit signal of a 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 self-interference canceller that transforms the IF transmit signal to an IF self-interference cancellation signal; a frequency upconverter that converts the IF self-interference cancellation signal to an IF-sourced RF self-interference signal; an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal; a receive coupler, communicatively coupled to an RF receive signal of the wireless communication system, that combines the RF self-interference cancellation signal and the IF-sourced RF self-interference cancellation signal with the RF receive signal; and a digital self-interference canceller; an analog-to-digital converter;
wherein the analog-to-digital converter converts the IF transmit signal to a digitized IF transmit signal;
wherein the digital self-interference canceller transforms the digitized IF transmit signal to a digital self-interference cancellation signal; anda digital-to-analog converter;
wherein the digital-to-analog converter converts the digital self-interference cancellation signal to a digitally-sourced IF self-interference cancellation signal;
wherein the digitally-sourced IF self-interference cancellation signal and the IF self-interference cancellation signal are combined to form an IF hybrid self-interference cancellation signal;
wherein the upconverter converts the IF hybrid self-interference cancellation signal to an RF hybrid self-interference cancellation signal;
wherein the receive coupler combines the RF self-interference cancellation signal and the RF hybrid self-interference cancellation signal with the RF receive signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification