Method of and apparatus for automatic equalizing filter

Details Method of and apparatus for automatic equalizing filter Method of and apparatus for automatic equalizing filter

1994-03-01

1996-05-14

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

375231, 375232, H03H 730

Patent

active

055175244

ABSTRACT:
The present invention is intended to converge tap coefficients of an equalizer at high speed with high accuracy by a small number of calculations. An automatic equalizing filter of the invention comprises a synchronizing data detecting circuit for detecting a synchronizing portion from a data sequence of a reception signal, an equalizer, a tap coefficient determining for determining tap coefficients (C.sub.0, C.sub.1, C.sub.2, . . . , C.sub.n) of the equalizer and an impulse response estimating for estimating an impulse response on the basis of a cross-correlation function provided between the synchronizing portion and a previously-designated synchronizing pattern, thereby setting initial values of the tap coefficients (C.sub.0, C.sub.1, C.sub.2, . . . , C.sub.n) of the equalizer on the basis of the impulse response estimated from this impulse response estimating.

REFERENCES:
patent: 4575857 (1986-03-01), Murakami
patent: 5251233 (1993-10-01), Labedz et al.
patent: 5327496 (1994-07-01), Russell et al.

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