Method for recovering a phase difference signal

Details Method for recovering a phase difference signal Method for recovering a phase difference signal

1987-06-12

1989-03-07

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375120, 375 97, 329124, H03D 302

Patent

active

048113638

ABSTRACT:
A method of recovering a signal representing the phase difference between a local carrier signal and the carrier of an amplitude and/or phase shift keyed received signal involves dividing the received signal into two cartesian oriented signal components which are a function of the phase difference and have a quadrature relationship to one another. Each pair of cartesian oriented signal components, representing one of a plurality of possible signal states, is converted into two polar oriented signal components. A decision is made as to which ones of the permitted, unfalsified polar signal components come closest to the polar signal components of the received signals. The phase difference is derived from a comparison between the result of the decision and the received polar signal components.

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