Carrier recovery phase-locked loop

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

H - Electricity

04

L

363/11, 331/40

H04L 27/22 (2006.01) H04L 27/227 (2006.01) H04L 27/00 (2006.01)

Patent

CA 1303691

ABSTRACT OF THE DISCLOSURE 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 selec- tively 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.

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