Pulse or digital communications – Equalizers – Automatic
Patent
1993-08-24
1995-08-08
Chin, Stephen
Pulse or digital communications
Equalizers
Automatic
375348, 375350, 36472417, 3647242, H03H 730, H03H 740
Patent
active
054405831
ABSTRACT:
An input digital signal is applied to a subtractor where the intersymbol interference component of the signal is removed by a cancelling signal and the ISI-free signal is fed to a decision circuit to produce a binary output, from which a decision error is then detected. A greater part of the cancelling signal is generated by a nonrecursive filter connected to the decision circuit and the remainder is generated by a second-order recursive filter whose tapped delay line is connected through an adder to the output of the tapped delay line of the nonrecursive filter. The tap signals of the recursive filter are respectively multiplied with first and second feedback coefficients and applied to the adder as feedback signals. The first feedback coefficient is equal to a sum of an attenuation constant of constant value (r.sub.f) and an attenuation coefficient of variable quantity (r) and the second feedback coefficient is equal to a product of the two attenuation coefficients. The variable quantity attenuation coefficient is adaptively updated by a correlation between the decision error and a signal derived from the output of the recursive filter.
REFERENCES:
patent: 4539690 (1985-09-01), Speidel
patent: 5293402 (1994-03-01), Crespo et al.
patent: 5297166 (1994-03-01), Batruni
"Pole-Zero Decision Feedback Equalization with a Rapidly Converging Adaptive IIR Algorithm" by Pedro M. Crespo et al., IEEE Journal on Selected Areas in Communications, vol. 9, No. 6, Aug. 91, pp. 817-829.
Chin Stephen
Le Amanda T.
NEC Corporation
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