Equalization system and method for equalizing a base-band teleco

Details Equalization system and method for equalizing a base-band teleco Equalization system and method for equalizing a base-band teleco

1991-08-12

1993-05-25

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

333 28R, H03H 730

Patent

active

052146707

ABSTRACT:
Equalizer which includes a filter for compensating the frequency attenuation of the received signal transmitted by a Data circuit terminating equipment DCE through a base-band telecommunication line. The equalizer includes a detector determining the instants when the received signal is equal to a predetermined voltage reference value Vref and a timer for measuring the period DT separating two consecutive instants. The coefficients of the filters included in the equalizer are computed in accordance with the measured period DT. This provides an adaptive compensation of the distortion introduced by the telecommunication line without necessitating any training sequence. For this purpose, the equalizer further includes a comparator for comparing the measured DT value to a given DTref value. When the former is greater than the latter, the equalization process is increased by a factor depending on DTref, DTmax being the maximum measured value and DTmin corresponding to the minimum measured DT value. In the reverse case, the equalization process is decreased by another given factor depending on DTref and DTmin parameters.

REFERENCES:
patent: 4047013 (1977-09-01), Milewski
patent: 4125899 (1978-11-01), Kawai et al.
patent: 4538283 (1985-08-01), Hogge, Jr.
patent: 5065410 (1991-11-01), Yoshida et al.
Archiv fur Elektronik und Ubertragungstechnik, vol. 40, No. 2, Mar./Apr. 1986, pp. 83-88, Stuttgart, De., F. Derr et al, "Adaptive Entzerrung Digitaler Ubertragungskanale Mittels Bestimmung der Impulsform".

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