Method of obtaining a phase difference signal

Details Method of obtaining a phase difference signal Method of obtaining a phase difference signal

1988-03-08

1989-06-27

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 97, 329124, H03D 324

Patent

active

048436160

ABSTRACT:
A method of obtaining a signal representing the phase difference between a local carrier signal and the carrier of an amplitude and/or phase shift keyed received signal wherein: the received signal is divided into two cartesian coordinate signal components which are a function of the phase difference and are in a quadrature relationship to one another; each pair of cartesian coordinate signal components, each representing one of a plurality of permitted signal states, is converted into two corresponding polar coordinate signal components, a decision is then made as to which is the permitted, unfalsified polar signal components which the polar signal components of the received signal most closely approach; and the phase difference is derived from a comparison between the decided-upon polar signal components and the received polar signal components.

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