Pulse or digital communications – Equalizers – Automatic
Patent
1992-12-11
1996-05-14
Chin, Stephen
Pulse or digital communications
Equalizers
Automatic
375348, 375350, 36472416, 3647242, H03H 730
Patent
active
055175279
ABSTRACT:
The present invention comprises an adaptive equalizer to be implemented in a receiver to cancel the ISIs. Basically, it has a decision feedback equalizer structure including a feedforward filter and a feedback filter. The receiver further includes a gain controller to properly adjust the amplitude of the equalized signals to reduce the non-equalization bias. It also has a detector to determine the symbol value of +3 +1, -1, and -3 and for generating the error signal to update the coefficients of the equalizer via the adaptive algorithm. The adverse effect of error propagation is reduced by strengthening the function of the feedforward filter. The equalizer training period is also shorten as the gain controller provides additional information for the detector to eliminate the signal bias caused by the non-optimal coefficients of the equalizer.
REFERENCES:
patent: 3775685 (1973-11-01), Eggimann et al.
patent: 4322811 (1982-03-01), Voorman
patent: 4789994 (1988-12-01), Randall et al.
patent: 4905254 (1990-02-01), Bergmans
patent: 5005184 (1991-04-01), Amano et al.
patent: 5119401 (1992-06-01), Tsujimoto
patent: 5230012 (1993-07-01), Schenk
patent: 5267265 (1993-11-01), Mizoguchi
patent: 5345476 (1994-09-01), Tsujimoto
Chin Stephen
Industrial Technology Research Institute
Le Amanda T.
Lin Bo-In
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