Fully adaptive modem receiver using whitening matched filtering
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United States of America Patent
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Jul 9, 1991
Grant Date -
N/A
app pub date -
Jun 5, 1989
filing date -
Jun 5, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Fully adaptive modem receiver for data-transmission systems which use trellis-coded modulation (TCM) and comprises an adaptive whitened-matched filter (WMF) and a reduced-state trellis decoder. The WMF consists of an adaptive linear equalizer with fractional-T spaced coefficients, and an adaptive linear predictor. The decoder combines the functions of equalization and TCM decoding. It employs combined intersymbol interference (ISI) and code states which exploit the set-partitioning structure of the underlying TCM code to provide full or reduced-state information about past ISI terms. The decoder branch metric cancels those ISI terms that are not, or are only partially, represented by the trellis states.
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