Automatic frequency control method and circuit for use in a dela

Details Automatic frequency control method and circuit for use in a dela Automatic frequency control method and circuit for use in a dela

1995-01-17

1996-11-26

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

375327, 329307, 4551922, H04L 2706

Patent

active

055793460

ABSTRACT:
A delay detection is performed to baseband signals subjected to an orthogonal demodulation to obtain a delay detection output and a frequency error is found from the delay detection output. The frequency error is converted into a control frequency which is accumulated to generate a phase rotation .phi. which is used to rotate the input baseband signals before being subjected to the delay detection, thereby to perform frequency correction. By providing filters downstream of a phase rotation circuit and upstream of a delay detection circuit, automatic frequency control can be realized without performance deterioration.

REFERENCES:
patent: 4253184 (1981-02-01), Gitlin et al.
patent: 4527278 (1985-07-01), Deconche et al.
patent: 4879728 (1989-11-01), Tarallo
patent: 4943982 (1990-07-01), O'Neil, II et al.
patent: 5157694 (1992-10-01), Iwasaki et al.
patent: 5379323 (1995-01-01), Nakaya
patent: 5386239 (1995-01-01), Wang et al.
patent: 5400366 (1995-03-01), Iwamatsu

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