Start-up automatic frequency control (AFC) method and apparatus

Details Start-up automatic frequency control (AFC) method and apparatus Start-up automatic frequency control (AFC) method and apparatus

2007-03-06

2007-03-06

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Receivers

Automatic frequency control

C375S149000, C375S150000, C375S226000, C375S367000, C342S199000, C342S352000, C370S342000, C370S503000

Reexamination Certificate

active

10629429

ABSTRACT:
Method and apparatus for adjusting the frequency of a voltage controlled oscillator (VCO) at a receiver to synchronize the receiver with the transmitter by correlating a synchronization code channel with training sequences to estimate positive and negative offsets which are employed to estimate an error, which is then filtered. The filter output provides voltage controlling the VCO. The same technique may be employed to control a numeric controlled oscillator (NCO).

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