Systems and methods for linearized-mixer out-of-band interference mitigation

A system for linearized-mixer interference mitigation comprising:

• first and second linearized frequency downconverters;
• wherein the first linearized frequency downconverter downconverts a sampled radio-frequency (RF) transmit signal to a baseband (BB) transmit signal having a first BB frequency;
• wherein the second linearized frequency downconverter downconverts a sampled RF receive signal to a BB receive signal having a second BB frequency;
• wherein each of the first and second linearized frequency downconverters comprises:
• a primary mixer that generates a primary-mixer-output signal from a first local oscillator (LO) signal and an input signal;
• a distortion-source mixer that generates a distortion-source-output signal from a second LO signal and the input signal;
• and
• an output signal coupler that generates an output signal by combining the primary-mixer-output signal and the distortion-source-output signal, wherein, at the output signal coupler, the distortion-source-output signal is inverted relative to the primary-mixer-output signal, resulting in reduced non-linear distortion in the output signal relative to the primary-mixer-output signal;
• a sampling analog interference filtering system that, in order to remove interference in the transmit band, filters the sampled BB transmit signal to generate a cleaned BB transmit signal;
• a first analog-to-digital converter that converts the cleaned BB transmit signal to a digital transmit signal;
• a second analog-to-digital converter that converts the BB receive signal to a digital receive signal;
• and
• a digital interference canceller that transforms the digital transmit signal to a digital interference cancellation signal;
• wherein the digital receive signal and the digital interference cancellation signal are combined in order to remove a first portion of receive-band interference.