Digital modem having a monitor for signal-to-noise ratio
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United States of America Patent
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Nov 26, 1985
Grant Date -
N/A
app pub date -
Jun 30, 1983
filing date -
Jun 30, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention pertains to a digital modem utilizing QAM-type modulation having a signal-to-noise monitor which utilizes some of the components of a standard modem without interfering with its normal operation. The monitor averages the absolute value of the difference between the signal received by the modem and the ideal signal as represented on a typical signal constellation. In order to minimize the effect of phase and amplitude errors the monitor only handles the innermost signals of the constellation and ignores all the other signals.
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