Digital apparatus for broadband carrier-recovery

Details Digital apparatus for broadband carrier-recovery Digital apparatus for broadband carrier-recovery

1995-03-01

1996-11-05

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

375326, 455265, H04L 27233

Patent

active

055725538

ABSTRACT:
A method of controlling a digital carrier recovery apparatus designed to be integrated in a demodulation stage of a receiver for receiving a digital signal. The demodulation stage includes a carrier recovery detection apparatus. The carrier recovery detection apparatus includes a loop filter including a summing circuit followed by a bistable circuit operating in time with the symbol time, and a switching device disposed between the summing circuit and the bistable circuit. The switching device is driven to alternately apply to the bistable circuit a control word, whose variation between two successive applications to the bistable circuit is less than the acquisition band of the carrier recovery apparatus, and the output signal of the summing circuit. By alternately applying the control word and the output signal, the acquisition band is displaced relative to the tracking range of the carrier recovery apparatus.

REFERENCES:
patent: 3931575 (1976-01-01), Amoroso, Jr.
patent: 4691377 (1987-09-01), Yoshihara et al.
patent: 5495510 (1996-02-01), Kimiavi
IEEE International Conference On Communications, 1990, 15-19 Apr. 1990, Georgia US, IEEE, NY, US 1990, pp. 1418-1422, Takenaka et al, "A Digital Signal Processing Demodulator with a Wide Frequency Acquisition Range".

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