Patent ID: 8249540
Filing Date: 2012-08-21
Classification: H04B,H04L

Abstract:
1. A method to detect a radio frequency signal-of-interest in an input signal, that also includes at least one interference signal, comprising: (a) generating a digital reference signal corresponding to the at least one interference signal in at least a waveform, a magnitude and a delay; (b) converting the digital reference signal to a corresponding analog coarse cancellation signal; (c) combining the input signal with the analog coarse cancellation signal in a coarse combiner to generate a coarse residue signal, wherein the interference signal is substantially cancelled and the signal-of-interest is substantially maintained; (d) generating a fine cancellation signal, corresponding to a residual interference signal in the coarse residue in at least a waveform, a magnitude and a delay; (e) combining the coarse residue signal with the fine cancellation signal in a fine combiner, to generate a fine residue signal, wherein the residual interference signal is substantially cancelled and the signal of interest is substantially maintained; and (f) digitizing the fine residue signal and detecting the signal-of-interest.