Pulse or digital communications – Equalizers – Automatic
Patent
1996-05-03
1998-06-02
Chin, Stephen
Pulse or digital communications
Equalizers
Automatic
375348, 375349, H04L 2701
Patent
active
057612439
ABSTRACT:
A receiver for transmitted signals which represent digital symbol values includes a low-pass filter to minimize transmission noise by reducing the receiver bandwidth. However, this creates pulse distortion which can cause intersymbol interference when the filtered signal is supplied to a symbol detector. Such interference is minimized by the inclusion of a feedback loop between the output of the symbol detector and the input to the filter, in which a detected symbol is multiplied by correction factor and supplied to a subtractor where it is subtracted from the signal to be filtered. The result of the subtraction is supplied to the filter. The noise reduction filter is thus also used for matching the intersymbol distortion characteristic of a filtered detected symbol to the intersymbol distortion characteristic of a filtered received signal pulse.
REFERENCES:
patent: 4213095 (1980-07-01), Falconer
patent: 4864590 (1989-09-01), Arnon et al.
patent: 4912725 (1990-03-01), Hulth
patent: 5327460 (1994-07-01), Batruni
Carlos A. Belfiore et al., "Decision Feedback Equalization", Proceedings of the IEEE, vol. 67, No. 8, Aug. 1979, pp. 1143-1157.
Bergmans Johannes W. M.
Russell Mark A,.
Sluijter Robert J.
Chin Stephen
Gluck Jeffrey W.
Goodman Edward W.
U.S. Philips Corporation
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