Carrier recovery of modulated signals

Details Carrier recovery of modulated signals Carrier recovery of modulated signals

1986-08-29

1987-12-08

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329 50, 375 97, 455265, H04B 116

Patent

active

047122218

ABSTRACT:
A method and apparatus are described for phase and frequency locking a reference oscillator to an incoming modulated signal. The method and apparatus enable the carrier recovery of the incoming modulated signal. Phase and frequency locking devices are connected in feedback loops with a coherent detector that determine the amount of phase and frequency error between the reference oscillator of the coherent detector and the incoming modulated signal. The feedback loops correct such frequency and phase error so as to enable the reference oscillator to be in phase and frequency step with the modulated signal.

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patent: 4560941 (1985-12-01), Welles, II et al.
patent: 4587498 (1986-05-01), Bonnerot et al.
patent: 4639682 (1987-01-01), Takeuchi

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