Digital multi-level multi-phase modulation communication system
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United States of America Patent
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-
Aug 18, 1981
Grant Date -
N/A
app pub date -
Sep 28, 1979
filing date -
Oct 3, 1978
priority date (Note) -
Expired
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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.
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