Automatic frequency control apparatus and method therefor

Details Automatic frequency control apparatus and method therefor Automatic frequency control apparatus and method therefor

1994-06-08

1996-03-19

Tse, Young T.

Pulse or digital communications

Receivers

Automatic frequency control

375327, 4551641, 329308, H03J 700, H04L 2706, H04L 704

Patent

active

055008780

ABSTRACT:
An automatic frequency control apparatus includes a local oscillator, a quadrature detector, a frequency offset value estimation circuit, a demodulation circuit, a synchronization determination circuit, a memory, and an AFC circuit. The synchronization determination circuit determines reception synchronization on the basis of demodulated signals from the demodulation circuit to output a synchronization determination signal to the AFC circuit when reception synchronization is established and outputs the value to the AFC circuit. The apparatus also includes a power-on state detection circuit for outputting a detection signal to the AFC circuit. The AFC circuit determines the oscillation frequency of the local oscillator on the basis of the outputs from the above components. An automatic frequency control method is also disclosed.

REFERENCES:
patent: 3940702 (1976-02-01), Yoshimura et al.
patent: 4053838 (1977-10-01), Amaya
patent: 4591914 (1986-05-01), Hakamada et al.
patent: 5023813 (1991-06-01), Brown, III
patent: 5247543 (1993-09-01), Tsuda et al.
Alain Blanchard, "Phase-Locked Loops/Application to Coherent Receiver Design", A Wiley-Interscience Publication, 1976 by John Wiley & Sons, Inc., pp. 281-287.

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