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Demodulator system and method

  • US 7,792,220 B2
  • Filed: 12/19/2006
  • Issued: 09/07/2010
  • Est. Priority Date: 12/19/2006
  • Status: Expired due to Fees
First Claim
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1. A demodulator system comprising:

  • an analog-to-digital converter (ADC) configured to sample a modulated signal and to output a digital signal;

    a Coordinate Rotation Digital Computer (CORDIC) mixer coupled to an output of the ADC, the CORDIC mixer to generate an Inphase (I) signal and a Quadrature (Q) signal based on the digital signal output by the ADC and further based on an input frequency;

    a filter path to process the I signal and the Q signal generated by the CORDIC mixer, wherein the filter path is coupled to at least one decimator;

    a demodulation stage to demodulate an output of the filter path, wherein the demodulation stage includes a CORDIC demodulator; and

    a symbol decoder to receive a phase signal from the CORDIC demodulator, the symbol decoder including symbol recognition logic to adjust a sample of the phase signal by an offset value, to map the adjusted sample to a nearest predetermined phase value of a plurality of predetermined phase values, and to determine a symbol using a difference between the nearest predetermined phase value and a prior nearest predetermined phase value, wherein the offset value at least partially compensates for a phase drift generated at the CORDIC mixer.

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