Automatic equalizer for a data transmission channel

Details Automatic equalizer for a data transmission channel Automatic equalizer for a data transmission channel

1992-04-23

1993-09-21

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 12, 3647242, H03H 0730

Patent

active

052475417

ABSTRACT:
An automatic equalizer for a data transmission channel capable of removing intersymbol interference and phase fluctuations accurately without lowering the convergence rate even when the frequency characteristic of the channel sharply changes. A summation output to be fed to a decision unit has the phase thereof so rotated as to compensate for an amount of phase fluctuation. The output of the decision unit to be applied to a feedback filter, which follows the decision unit, and an error to be applied to a tap coefficient control section each has the phase thereof rotated in such a manner as to add phase rotation in matching relation to the amount of phase rotation. Even when the tap coefficient control section is implemented with an RLS (Recursive Least Square) alogorithm, it can update tap coefficients by the same procedure with no regard to phase fluctuations.

REFERENCES:
patent: 3868603 (1975-02-01), Guidoux
patent: 5003555 (1991-03-01), Bergmans
patent: 5097482 (1992-03-01), Serizawa et al.
patent: 5119401 (1992-06-01), Tsujimoto
patent: 5175747 (1992-12-01), Murakami

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