Index decoder for digital modems
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United States of America Patent
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-
Feb 24, 1987
Grant Date -
N/A
app pub date -
Apr 15, 1985
filing date -
Apr 15, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a QAM digital modem decoder section, the received signals (after equalization) are transposed to a preselected quadrant of the signal constellation to generate an index pointer. The index pointer and the actual quadrant are used to decode the QAM signals. The index pointer is also used to update the equalizer taps and to operate a phase tracking loop used to reduce or eliminate phase jitter.
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