Self-interference cancellation antenna systems and methods
First Claim
1. A method of performing self-interference cancellation comprising:
- sending a transmit signal through a circulator to substantially isolate the transmit signal from a receiver, with at least a portion of the transmit signal entering a receive path towards the receiver;
generating a reflected signal from an antenna, the reflected signal being at substantially less power than an incident power to the antenna, and the reflected signal including a transmitter carrier signal and a transmitter noise;
routing a received signal from the antenna to the receiver;
routing the reflected signal through a phase shifter in the receive path; and
combining the reflected, phase shifted transmitter noise with the received signal in the receive path to cancel the portion of the transmit signal that entered the receive path towards the receiver.
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Accused Products
Abstract
The present application describes systems and methods of performing self-interference cancellation. According to an embodiment, the method sends a transmit signal through a circulator to substantially isolate the transmit signal from a receiver, with at least a portion of the transmit signal entering a receive path towards the receiver. The method also generates a reflected signal from an antenna. The reflected signal is at substantially less power than an incident power to the antenna. The reflected signal includes a transmitter carrier signal and a transmitter noise. The method also routes a received signal from the antenna to the receiver, and routes the reflected signal through a phase shifter in the receive path. Further, the method combines the reflected, phase shifted transmitter noise with the received signal in the receive path to cancel the portion of the transmit signal that entered the receive path towards the receiver.
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Citations
20 Claims
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1. A method of performing self-interference cancellation comprising:
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sending a transmit signal through a circulator to substantially isolate the transmit signal from a receiver, with at least a portion of the transmit signal entering a receive path towards the receiver; generating a reflected signal from an antenna, the reflected signal being at substantially less power than an incident power to the antenna, and the reflected signal including a transmitter carrier signal and a transmitter noise; routing a received signal from the antenna to the receiver; routing the reflected signal through a phase shifter in the receive path; and combining the reflected, phase shifted transmitter noise with the received signal in the receive path to cancel the portion of the transmit signal that entered the receive path towards the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A self-interference cancellation system, comprising:
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a first circulator coupled to a transmitter power amplifier, the first circulator being coupled to a transmission-reception path of the self-interference cancellation system; a second circulator coupled to the first circulator; a receiver amplifier coupled to a reception path of the self-interference cancellation system; a phase shifter coupled to the reception path and the second circulator; and a filter coupled to the phase shifter, and being located between the phase shifter and an electrical load. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 19, 20)
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18. The system 10, wherein the electrical load includes a resistor.
Specification