Frequency offset detection processing system and frequency...

Details Frequency offset detection processing system and frequency... Frequency offset detection processing system and frequency...

2004-04-20

2009-02-24

Payne, David C (Department: 2611)

Pulse or digital communications

Receivers

Automatic frequency control

C375S371000

Reexamination Certificate

active

07496160

ABSTRACT:
A frequency offset detection processing system includes a TCXO, demodulation unit, frequency offset detection unit, and AFC control unit. In the AFC control unit, a majority determination unit determines whether each of phase moving amount detection values by a plurality of frequency offsets is positive or negative and totalizes to determine which of the positive values and the negative values are larger in number. A detection value conversion unit converts the phase moving amount detection values in accordance with the majority determination result. An averaging processing unit adds the phase moving amount detection values and divides the sum by the number of added values. A correction value calculation unit calculates a frequency offset from the phase moving amounts after averaging processing. A TCXO control unit corrects TCXO control on the basis of the calculated frequency offset. A frequency offset detection processing method is also disclosed.

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