Carrier regeneration circuit

Details Carrier regeneration circuit Carrier regeneration circuit

1976-08-20

1978-09-19

Martin, John C.

Telegraphy

Systems

Alternating or pulsating current

325324, 178 88, 325 40, H04L 2724

Patent

active

041147103

ABSTRACT:
A carrier regeneration circuit regenerates the carrier from the QAM (Quadrature Amplitude Modulated) received signal, as produced and transmitted by a quadrature partial response modulation system wherein quadrature-related carriers (i.e., having a phase difference of 90.degree.) of the same frequency are amplitude modulated with two parallel signals which have been subject to partial response conversion. The carrier regeneration circuit comprises a probability decision circuit which decides the probability of generation of particular demodulated data code combinations, and a carrier regeneration control circuit which maintains the phase ambiguity of the regenerated carrier within an integer multiple of 90.degree.. The control circuit responds to the output of the probability decision circuit for selectively shifting the phase of the regenerated carrier by 45.degree..

REFERENCES:
patent: 3529290 (1970-09-01), Schroeder
patent: 3590381 (1971-06-01), Ragsdale
patent: 3845412 (1974-10-01), Rearwin
patent: 3984634 (1976-10-01), Painter
patent: 4010323 (1977-03-01), Peck
patent: 4024342 (1977-05-01), Croisier

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