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Carrier tracking for AM in-band on-channel radio receivers

  • US 20070110186A1
  • Filed: 11/14/2005
  • Published: 05/17/2007
  • Est. Priority Date: 11/14/2005
  • Status: Active Grant
First Claim
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1. A method for carrier tracking in AM in-band on-channel radio receivers, the method comprising the steps of:

  • receiving an input signal;

    generating a local oscillator signal in response to an oscillator control signal;

    mixing the input signal with a local oscillator signal to produce a first signal;

    filtering the first signal to produce a filtered first signal at a decimated sample rate;

    detecting the phase error and frequency error of the filtered first signal normalized to mitigate effects of signal fades; and

    using an adaptive loop filter to produce the oscillator control signal in response to the phase error and frequency error of the filtered first signal.

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