Rapidly adaptable channel equalizer

Details Rapidly adaptable channel equalizer Rapidly adaptable channel equalizer

1992-06-30

1994-05-31

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 12, H03H 730, H03H 740

Patent

active

053175956

ABSTRACT:
A method for use in a digital data transfer apparatus, such as a radio telephone (10), that includes an adaptive equalizer, such as an adaptive filter (32), for receiving, correcting, and outputting data symbols. The method determines correction coefficients for the adaptive equalizer and includes a first step of, for every data symbol output by the adaptive equalizer, maintaining a first matrix R that is a NxN channel correlation matrix and a second matrix P that is a N.times.1 cross correlation vector between a received signal and a transmitted symbol. The method includes a second step of, for every k.sup.th symbol output by the adaptive equalizer, determining a set of correction coefficients (C) for the adaptive equalizer based upon the matrices R and P. A third step of the method applies the set of determined correction coefficients to the adaptive equalizer so as to optimally correct a subsequently received data symbol. The correction coefficients are calculated with an inverse matrix of the channel correlation matrix. As a result, the correction coefficients are, in principle, optimal.

REFERENCES:
patent: 4021738 (1977-05-01), Gitlin et al.
patent: 5068873 (1991-11-01), Murakami

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