CPC H04L 27/14 (2013.01) [H04B 1/10 (2013.01)] | 21 Claims |
1. A tracking and rejection filter for use in a receiver of a radio, the tracking and rejection filter comprising:
a selectable filter configured to provide an output digital in-phase signal and an output digital quadrature signal based on a center frequency, a digital in-phase signal corresponding to an in-phase component of a received radio frequency signal, and a digital quadrature signal corresponding to a quadrature component of the received radio frequency signal; and
a select circuit configured to select the center frequency of the selectable filter according to whether an interfering signal is detected in a target frequency band of the received radio frequency signal, the interfering signal is a frequency modulated signal having at least a frequency equal to the center frequency, the center frequency being selected from a predetermined frequency and an estimated center frequency determined using an instantaneous frequency signal, the instantaneous frequency signal being based on the digital in-phase signal and the digital quadrature signal.
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