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 digital self-interference canceller that transforms a digital transmit signal of the wireless communication system to a digital self-interference cancellation signal; and
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.
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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
16 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 digital self-interference canceller that transforms a digital transmit signal of the wireless communication system to a digital self-interference cancellation signal; and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for hybrid self-interference cancellation comprising:
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receiving an RF transmit signal of a wireless communications system; transforming the RF transmit signal into an RF self-interference cancellation signal using an RF self-interference canceller; frequency downconverting the RF transmit signal to an IF transmit signal; transforming the IF transmit signal into an IF self-interference cancellation signal using an IF self-interference canceller; frequency upconverting the IF self-interference cancellation signal to an IF-sourced RF self-interference cancellation signal; receiving a digital transmit signal; transforming the digital transmit signal into a digital self-interference cancellation signal; and combining the RF self-interference cancellation signal and the IF-sourced RF self-interference cancellation signal with an RF receive signal of the wireless communications system. - View Dependent Claims (13, 14, 15, 16)
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Specification