Patent ID: 7792220

Claim:
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.