Multiple stage adaptive equalizer

Details Multiple stage adaptive equalizer Multiple stage adaptive equalizer

1997-01-30

1998-11-24

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

333 18, 330304, H03H 730, H03K 5159

Patent

active

058418105

ABSTRACT:
An adaptive equalizer for adaptively equalizing a data signal received via a communications path having a signal loss magnitude which increases with signal frequency includes multiple, serially coupled adaptive filter stages. The input data signal is successively filtered and magnitude weighted by successive adaptive filter circuits in accordance with corresponding, respective adaptation control signals. The frequency domain ratio of output signals to corresponding input signals for each adaptive filter circuit represents a corresponding, respective adaptive filter transfer function. An equalizer controller, in accordance with a single equalization control signal, generates the multiple, individual adaptation control signals. The product of all of the adaptive filter transfer functions is an approximate inverse of the transfer function of the input data signal communications path, with each individual adaptive filter transfer function being an approximate inverse of a transfer function which corresponds to a portion of the input data signal communications path. The magnitude of the equalization control signal corresponds to the transfer function of the input data signal communications path, while the magnitude of each adaptation control signal corresponds to one of the transfer function corresponding to a portion of the input data signal communications path.

REFERENCES:
patent: 4459698 (1984-07-01), Yumoto et al.
patent: 4745622 (1988-05-01), Gupta
patent: 4862103 (1989-08-01), Funada
patent: 5115213 (1992-05-01), Eguchi

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