Signal cancellation system and method

A method configured to generate a desired signal from a received signal, comprising:

• downconverting the received signal using a local oscillator (LO) signal having an LO frequency to generate a downconverted received signal;
• modifying the LO signal to generate a frequency offset (FO) LO signal having an offset frequency that is different from the LO frequency;
• downconverting a signal derived from the received signal using the FOLO signal to generate a downconverted FO signal;
• and
• cancelling either the downconverted received signal or the downconverted FO signal from the received signal to generate the desired signal.

A frequency offset (FO) signal estimation circuitry, comprising:

• a frequency offset local oscillator (FOLO) generation circuitry configured to modify a local oscillator (LO) signal having an LO frequency to generate a FOLO signal having an offset frequency that is different from the LO frequency;
• and
• a FOLO downconverter circuitry configured to use the FOLO signal to downconvert a signal to generate a downconverted FO signal, wherein the downconverted FO signal is used to generate a desired signal, wherein
• the signal comprises a desired signal component centered at the LO frequency and a blocker signal component at the offset frequency, and the FOLO downconverter circuitry is configured to downconvert the signal to generate the downconverted FO signal and provide the downconverted FO signal to cancellation circuitry, wherein the cancellation circuitry is configured to subtract the downconverted FO signal from the downconverted signal to generate the desired signal, or
• the signal comprises an out-of-band signal comprising a transmit signal output by a transmit power amplifier looped back to a receive chain from which a downconverted received signal has been cancelled, and the FOLO downconverter circuitry is configured to downconvert the out-of-band signal using the FOLO signal to generate the downconverted FO signal, wherein the downconverted FO signal is the desired signal.