Full-duplex self-interference cancellation systems

A full-duplex transceiver for radio frequency (RF) communications, comprising:

• an oscillator that provides a reference carrier frequency;
• a transmit chain that converts a first digital baseband signal using the reference carrier frequency to a first RF signal for wireless transmission;
• a receive chain that receives a second RF signal converts the second RF signal using the reference carrier frequency to a second digital baseband signal;
• an auxiliary receive chain that receives a portion of the first RF signal from the transmit chain and converts the portion of the first RF signal to an auxiliary digital baseband signal;
• a digital signal processor configured to determine a channel transfer function based on an estimate of a wireless channel between the transmit chain and the receive chain;
• and
• a self-interference canceller configured to:
• generate a cancellation signal based on an application of the channel transfer function to the auxiliary digital baseband signal;
• and
• subtract the cancellation signal from the second digital baseband signal.

A method of self-interference cancellation in a full-duplex transceiver, comprising:

• converting, with a transmit chain, a first digital baseband signal to a first RF signal for wireless transmission using a reference carrier frequency;
• receiving a second RF signal and converting, with a receive chain, the second RF signal to a second digital baseband signal using the reference carrier frequency;
• converting, with an auxiliary receive chain, a portion of the first RF signal to an auxiliary digital baseband signal;
• determining a channel transfer function based on an estimate of a wireless channel between the transmit chain and the receive chain;
• generating a cancellation signal based on an application of the channel transfer function to the auxiliary digital baseband signal;
• and
• subtracting the cancellation signal from the second digital baseband signal.