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 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;
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 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.
58 Citations
20 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 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; 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 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, 13, 14)
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15. A method for frequency-isolated self-interference cancellation comprising:
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receiving an RF transmit signal of a wireless communications system; shifting a carrier frequency of the RF transmit signal; 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; 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 (16)
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17. A method for frequency-isolated 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; combining the 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 (18, 19, 20)
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Specification