Phase tracking loop for digital modem

Details Phase tracking loop for digital modem Phase tracking loop for digital modem

1982-08-12

1985-07-30

Safourek, Benedict V.

Pulse or digital communications

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329110, 375 39, H03L 708

Patent

active

045326401

ABSTRACT:
A phase tracking loop is provided for a digital modem. The phase tracking loop rotates the equalized output of the modem by a phase corrector angle generated by a phase error detector, frequency offset integrator and phase corrector integrator. The phase error is obtained by complex multiplexing the coordinates of the received signal with a phase corrector number. The first integrator operates on the sum of the detected phase error. The second integrator operates on the sum of the output of the phase detector and first integrator. The second integrator output comprises the phase corrector angle.

REFERENCES:
patent: 3821659 (1974-06-01), Ludwig
patent: 4091410 (1978-05-01), Citta
patent: 4333060 (1982-06-01), Mosley, Jr. et al.

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