Carrier recovery phase-locked loop

Details Carrier recovery phase-locked loop Carrier recovery phase-locked loop

1988-03-24

1989-08-08

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329104, 375 97, H04L 2722

Patent

active

048560278

ABSTRACT:
A carrier recovery phase-locked loop for recovering a carrier from a digitized quadrature phase shift keying modulated wave arriving on time division basis comprises a PLL circuit, first unit, responsive to the received signal, for preparing a phase comparator's characteristic adapted for a binary phase shift keying modulated wave, second unit, also responsive to the received signal, for preparing a phase comparator's characteristic adapted for the quadrature phase shift keying modulated wave and switching unit for selectively supplying output signals from the first and second units to the PLL circuit. During reception of a preamble, the carrier is recovered using the binary phase comparator's characteristic through the PLL circuit.

REFERENCES:
patent: 4600889 (1986-07-01), Rugen
patent: 4604583 (1986-08-01), Aoyagi et al.
patent: 4631485 (1986-12-01), Torelli et al.
patent: 4704582 (1987-11-01), Dixon et al.
A Generalized "Polarity-Type" Costas Loop for Tracking MPSK Signals, Oct. 1982 (8 pp.).

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