Method and apparatus for controlling frequency synchronization i

Details Method and apparatus for controlling frequency synchronization i Method and apparatus for controlling frequency synchronization i

1997-10-22

1999-08-03

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

375344, 4551641, 4551642, 455258, 455259, 455260, 327146, H04L 2706

Patent

active

059330597

ABSTRACT:
A method and apparatus for controlling frequency synchronization in a frequency correction feedback loop of a radio telephone. A processor in a frequency update controller ascertains increment/decrement values pro-proportionally related to confidence levels representing a ratio that a likelihood probability of estimated offset frequecies of an input carrier signal are accurate in proportion to a likelihood probability that the estimated offset frequencies are inaccurate. The processor adds or subtracts the value to a counter depending on its sign. When the counter reaches a certain predefined positive number, the counter is decremented by this number and the processor increases the frequency of a reference oscillator frequency. When the counter reaches a certain predefined negative number, the counter is incremented by the absolute value of the negative number and the processor decreases the frequency of the reference oscillator frequency.

REFERENCES:
patent: 5165051 (1992-11-01), Kumar
patent: 5495506 (1996-02-01), Shoji
patent: 5509034 (1996-04-01), Beukema
patent: 5628060 (1997-05-01), Yoon
European Patent Office, Standard Search Report, Mar. 20, 1998 RS 100213 US.

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