Method and device for detecting false locks between a reference signal and a signal to be demodulated by coherent digital demodulation
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United States of America Patent
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Jul 11, 1989
Grant Date -
N/A
app pub date -
Sep 14, 1988
filing date -
Sep 18, 1987
priority date (Note) -
Expired
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Abstract
In a method of detecting false locks between a reference signal and an input signal to be demodulated to produce a coherent demodulated signal comprising a number of phase states, the level of the input signal at a predetermined moment in the bit period of the input signal after demodulation and before regeneration is compared with the level of the input signal after regeneration, bit by bit. The reference signal is optionally corrected so as to lock its reference and phase to the input signal.
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