Decision feedback equalizer with second-order recursive filter c

Details Decision feedback equalizer with second-order recursive filter c Decision feedback equalizer with second-order recursive filter c

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.

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