Circuits and methods for reducing interference that spectrally overlaps a desired signal based on dynamic gain control and/or equalization

A method for reducing interference in a digitized input signal, the method comprising:

• dividing the digitized input signal into a plurality of spectral bins, each spectral bin having a power level, at least some of the spectral bins respectively containing portions of a desired signal, and at least one of the spectral bins containing interference;
• comparing a collective power level of the spectral bins to a first threshold;
• based upon the collective power level exceeding the first threshold, outputting a gain control signal;
• and
• adjusting a gain of an output signal responsive to the gain control signal, the output signal being based on the input signal,
• wherein the collective power level comprises a summation of the power levels of the spectral bins of the plurality of spectral bins.

A system for reducing interference in a digitized radio frequency (RF) input signal, the system comprising:

• a downconverter configured to downconvert the digitized RF input signal to an intermediate frequency (IF) signal;
• an IF A/D converter configured to digitize the IF signal;
• an adaptive excision circuit coupled to the IF A/D converter and configured to excise at least a portion of the interference from the digitized IF signal based on a collective power level and to generate a signal having reduced contribution from the interference;
• and
• an equalizer coupled to the adaptive excision circuit and configured to equalize the signal having reduced contribution from the interference,
• wherein the collective power level comprises a summation of the power levels of the spectral bins of the plurality of spectral bins.

A method for reducing interference in a digitized radio frequency (RF) input signal, the method comprising:

• downconverting the digitized RF input signal to an intermediate frequency (IF) signal;
• digitizing the IF signal;
• adaptively excising at least a portion of the interference from the digitized IF signal based on a collective power level and generating a signal having reduced contribution from the interference;
• and
• equalizing the signal having reduced contribution from the interference,
• wherein the collective power level comprises a summation of the power levels of the spectral bins of the plurality of spectral bins.