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

2007-05-25

2008-08-12

Wang, Ted (Department: 2611)

Pulse or digital communications

Receivers

Automatic frequency control

C375S149000, C375S150000, C342S199000, C370S342000, C370S347000, C370S503000

Reexamination Certificate

active

07412013

ABSTRACT:
A method and apparatus for use in connection with wireless communication to adjust the frequency of an oscillator to synchronize with a received signal 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 filtered output preferably provides a voltage controlling a voltage controlled oscillator (VCO). The same technique may be employed to control a numeric controlled oscillator (NCO).

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Hwang, Sang-Yun, et al., “Performance Analysis of Initial Cell Search Using Time Tracker for W-CDMA”, Globecom'01, 2001 IEEE Global Telecommunications Conference, San Antonia, Nov. 25-29, 2001, pp. 3055-3059.

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