Equalization system and method for equalizing a base-band telecommunication line
First Claim
1. Equalization system for a base-band line DCE including filtering means (107A, 107B) for compensating the frequency attenuation of the received signal provided by the line characterized in that it further includes:
- means (110,
216) for detecting the instants in time when the received signal is equal to a predetermined voltage reference value Vref,means (150) for measuring the period DT separating two consecutive of said instants,means (110, 231, 230, 229,
232) for monitoring the parameters (C1, C2, C3) of said filter in response to said measured period DT, whereby said equalization system is automatically adapted to the characteristics of the line without necessitating a training sequence.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
10 Claims
-
1. Equalization system for a base-band line DCE including filtering means (107A, 107B) for compensating the frequency attenuation of the received signal provided by the line characterized in that it further includes:
-
means (110,
216) for detecting the instants in time when the received signal is equal to a predetermined voltage reference value Vref,means (150) for measuring the period DT separating two consecutive of said instants, means (110, 231, 230, 229,
232) for monitoring the parameters (C1, C2, C3) of said filter in response to said measured period DT, whereby said equalization system is automatically adapted to the characteristics of the line without necessitating a training sequence. - View Dependent Claims (2, 3)
-
-
4. Equalization method for compensating the distortion introduced into a signal which is transmitted by a first DCE to a second DCE including a filtering means via a telecommunication line characterized in that it involves the step of:
-
measuring (212) a level Vabs of the received signal, detecting (216) the instants in time when the measured signal level Vabs is equal to a predetermined voltage reference value Vref, measuring (217, 219,
220) a period DT separating two consecutive of said instants,monitoring (229, 230, 231,
232) the filter parameters of the filtering means in response to said measured period DT, whereby the equalization process is automatically adapted to the characteristics of the telecommunication line without necessitating a training sequence. - View Dependent Claims (5, 6, 7, 8, 9, 10)
-
Specification