Systems and methods for frequency-isolated self-interference cancellation
First Claim
Patent Images
1. A system for frequency-isolated self-interference cancellation comprising:
- a transmit coupler, communicatively coupled to a Radio Frequency (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 Intermediate Frequency (IF) transmit signal having an IF carrier frequency, wherein the IF carrier frequency is less than the first RF carrier frequency;
an 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 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 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 to form a reduced-interference receive signal; and
a frequency shifter.
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Abstract
A system for frequency-isolated self-interference cancellation includes a transmit coupler, that samples an RF transmit signal to create a sampled RF transmit signal having a first RF carrier frequency, an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal, a receive coupler, that combines the RF self-interference cancellation signal with an RF receive signal to form a reduced-interference receive signal, and a frequency shifter.
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Citations
15 Claims
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1. A system for frequency-isolated self-interference cancellation comprising:
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a transmit coupler, communicatively coupled to a Radio Frequency (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 Intermediate Frequency (IF) transmit signal having an IF carrier frequency, wherein the IF carrier frequency is less than the first RF carrier frequency; an 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 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 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 to form a reduced-interference receive signal; and a frequency shifter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for frequency-isolated self-interference cancellation comprising:
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receiving a Radio Frequency (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 Intermediate Frequency (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; 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 to form a reduced-interference receive signal; and shifting a carrier frequency of the reduced-interference receive signal. - View Dependent Claims (14, 15)
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Specification