Pulse or digital communications – Repeaters – Testing
Patent
1989-06-05
1991-07-09
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 99, 3647242, H03H 0730
Patent
active
050311956
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.
REFERENCES:
patent: 4320526 (1982-03-01), Gitlin
patent: 4462108 (1984-07-01), Miller
patent: 4631735 (1986-12-01), Qureshi
patent: 4833693 (1989-05-01), Gyuboglu
patent: 4847880 (1989-07-01), Kamerman et al.
P. R. Chevillat and E. Eleftheriou, "Decoding of Trellis-Encoded Signals in the Presence of Intersymbol Interference and Noise", IEEE Communications Society, IEEE International Conference on Communications, Jun. 12-15, 1988, pp. 0694-0699.
Chevillat Pierre R.
Eleftheriou Evangelos
Bocure Tesfaldet
Duffield Edward H.
International Business Machines - Corporation
Safourek Benedict V.
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