Patent ID: 8837654

Claim:
A signal receiver, comprising: an antenna interface for receiving signals from an antenna; a calibration signal generator, coupled to the antenna interface, to inject a calibration signal at the antenna interface, the calibration signal comprising a multi-tone signal having a plurality of orthogonal frequency components in a predefined range of frequencies; analog signal processing circuitry coupled to the antenna interface for processing the received signals to produce filtered signals; sampling circuitry to sample the filtered signals so as to produce digitized received signals; and a digital compensator to receive the digitized received signals and compensate for non-uniform group delay and amplitude distortion introduced by the analog signal processing circuitry to produce compensated digitized received signals, wherein the digital compensator is configured in accordance with phase and amplitude values produced by a Fourier transform of signals received by the digital compensator in response to injection of the calibration signal at the antenna interface, the Fourier transform producing the phase and amplitude values for a plurality of frequencies corresponding to the orthogonal frequency components of the calibration signal.