Method and device for removing frequency offset

Details Method and device for removing frequency offset Method and device for removing frequency offset

1993-07-19

1995-05-02

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

375230, 329318, H04L 2706

Patent

active

054126959

ABSTRACT:
A device for removing a frequency offset in modem reception signals includes a sampling part for sampling signals, a carrier phase control (CAPC) part to compute and correct a frequency offset value .theta..sub.1, an automatic equalizer, a determining circuit, and a frequency offset computing part disposed between the automatic equalizer and the determining circuit to separately compute the frequency offset value .theta..sub.2 from a vector signal sampled in the sampling part. The frequency offset value .theta..sub.2 is compared with the frequency offset value .theta..sub.1 computed by the carrier phase control part, and when the net error .DELTA..theta. exceeds a predetermined value, a renewing part forcibly substitutes the first frequency offset value .theta..sub.1 in the carrier phase control part with the second frequency offset value .theta..sub.2.

REFERENCES:
patent: 4394768 (1983-07-01), Sari
patent: 4621366 (1986-11-01), Cain et al.
patent: 5214391 (1993-05-01), Serizawa et al.
patent: 5233632 (1993-08-01), Baum et al.
patent: 5283813 (1994-02-01), Shalvi et al.
patent: 5297165 (1994-03-01), Ueda et al.

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