SYSTEMS AND METHODS FOR MODIFIED FREQUENCY-ISOLATION SELF-INTERFERENCE CANCELLATION
First Claim
Patent Images
1. A system for frequency isolation modified 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;
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;
wherein the RF receive signal has a second RF carrier frequency; and
a frequency shifter that frequency shifts only one of the RF transmit signal and the reduced-interference receive signal;
wherein frequency shifting only one of the RF transmit signal and the reduced-interference receive signal modifies frequency isolation between the RF transmit signal and the reduced-interference receive signal.
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Abstract
A system for frequency isolation modified self-interference cancellation includes a transmit coupler, that samples an RF transmit signal; 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 the RF receive signal to form a reduced-interference receive signal; and a frequency shifter that frequency shifts only one of the RF transmit signal and the reduced-interference receive signal.
18 Citations
21 Claims
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1. A system for frequency isolation modified 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; 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;
wherein the RF receive signal has a second RF carrier frequency; anda frequency shifter that frequency shifts only one of the RF transmit signal and the reduced-interference receive signal;
wherein frequency shifting only one of the RF transmit signal and the reduced-interference receive signal modifies frequency isolation between the RF transmit signal and the reduced-interference receive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for frequency isolation modified 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; an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal; a frequency downconverter that converts the RF self-interference cancellation signal to a baseband self-interference cancellation signal; a receiver coupler, communicatively coupled to a baseband receive signal of the wireless communication system, that combines the baseband self-interference cancellation signal with the baseband receive signal to form a reduced-interference receive signal;
wherein the baseband receive signal is converted from an RF receive signal having a second RF carrier frequency; anda frequency shifter that frequency shifts only one of the RF transmit signal and the RF receive signal;
wherein frequency shifting only one of the RF transmit signal and the RF receive signal modifies frequency isolation between the RF transmit signal and the RF receive signal. - View Dependent Claims (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; combining the RF self-interference cancellation signal with a receive signal of the wireless communications system. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification