Self-interference cancellation system and method

A method to cancel self-interference in a transceiver, the method comprising:

• deriving a cancellation transmit (TX) local oscillator LO signal and a receive (RX) LO signal from a common LO signal;
• up-converting a baseband transmit leakage replica signal using the cancellation TX LO signal to generate a cancellation signal;
• combining the cancellation signal with a received signal to generate a corrected received signal;
• and
• down-converting the corrected received signal using the RX LO signal to generate a baseband corrected received signal.

A transceiver, comprising:

• a transmit chain configured to generate a transmitted signal from a baseband transmitted signal;
• a receive chain configured to generate a desired baseband received signal from a received signal;
• and
• a self-interference cancellation system, comprising:
• a replica circuitry configured to generate a baseband transmit leakage replica signal from the baseband transmitted signal;
• a cancellation signal circuitry configured to use a cancellation transmit (TX) local oscillator (LO) signal to up-convert the baseband transmit leakage replica signal to generate a cancellation signal;
• a cancellation circuitry configured to combine the cancellation signal with the received signal to generate a corrected received signal wherein the receive chain comprises a down-conversion mixer configured to use a receive (RX) LO signal to down-convert the corrected received signal to generate a baseband corrected received signal;
• and
• an LO derivation circuitry configured to derive the cancellation TX LO signal and the RX LO signal from a common LO signal.