Automatic frequency control in the presence of data

Details Automatic frequency control in the presence of data Automatic frequency control in the presence of data

H - Electricity

04

B

325/80

H04B 1/16 (2006.01) H04L 27/227 (2006.01) H04L 27/00 (2006.01) H04L 27/18 (2006.01)

Patent

CA 2003580

ABSTRACT OF THE DISCLOSURE There is provided a method of and apparatus for Automatic Frequency Control (AFC) in the presence of data. It comprises removing the effects of data modulated onto the carrier, detecting the frequency difference between the carrier frequency and the phase of the reference oscillator, and adjusting the frequency of the reference oscillator to eliminate the frequency difference. It is further characterized by digitizing the modulated carrier in quadrature, sampling the modulated carrier in quadrature at a multiple of the modulated bit rate, rotating phases toward arctangent (I/Q)=0 to remove the effects of quadrature data (I/Q) modulated onto the carrier, detecting the frequency difference between the carrier frequency and the frequency of a Voltage Controlled type of reference oscillator with a phase trajectory estimator, adjusting the frequency of the reference oscillator by the frequency difference, and establishing and generating the requisite correction voltage for a Voltage Controlled type of reference oscillator (VCO) with the phase trajectory estimator.

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