Digital multi-level multi-phase modulation communication system

Details Digital multi-level multi-phase modulation communication system Digital multi-level multi-phase modulation communication system

1979-09-28

1981-08-18

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 54, 370 12, H04L 300, H04L 2718

Patent

active

042850622

ABSTRACT:
A digital multi-level multi-phase modulation system utilizes quaternary differential encoding and decoding of only the first two of N digital signal trains. A decision circuit is used to examine the frame pulses in one of the first two signal trains and in at least one of the remaining signal trains and generates output signals which can be used in a gate circuit to resolve the phase-lock ambiguity of the recovered carrier and thereby reproduce the original N signal trains.

REFERENCES:
patent: 3849595 (1974-11-01), Ishiguro
patent: 3955141 (1976-05-01), Lyon et al.

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