Patent ID: 8055234

Claim:
A receiver circuit, comprising: a downconverter circuit configured to downconvert a received radio frequency signal, comprising a desired signal and one or more interfering signals, to a non-zero intermediate frequency, to obtain an intermediate frequency signal; a distortion waveform generator configured to generate an estimated distortion waveform from the one or more interfering signals, without the use of a local oscillator signal, the estimated distortion waveform comprising one or more intermodulation products of the interfering signals at or near the non-zero intermediate frequency; first and second filters configured to filter the intermediate frequency signal and the estimated distortion waveform, respectively; first and second sampling circuits configured to sample the filtered intermediate frequency signal and the filtered estimated distortion waveform to obtain a sampled signal of interest and a sampled distortion signal, respectively; and an interference subtracting circuit configured to combine the sampled distortion signal with the sampled signal of interest to obtain interference-reduced signal samples.