Patent ID: 6205170
Filing Date: 2001-03-20
Classification: H04B,H04L

Abstract:
Data transmission/reception unit operable to exchange data with a remote unit through a channel using means for modulation/demodulation treatment distributed between said data transmission/reception unit and said remote unit, said transmission/reception unit including equalization means to equalize a first signal received from said remote unit and predistortion means to predistort a second signal transmitted to said remote unit,characterized in that (a)--the means for modulation/demodulation treatment operate according to a non-linear mode, and (b)--the unit includes(b1)--means to store information which is representative of a non-linear distortion of said modulation/demodulation treatment means and which defines a non-linear reference, and(b2)--means to adjust coefficients in the equalization means according to the signal received from the remote unit and said representative information, said adjusted coefficients being transmitted to said predistortion means,wherein said means to adjust coefficients includes;means to sample said first signal received from the remote unit to a higher frequency than a frequency of logic symbols associated with the signal received and to define sample sets, each one defined by a sample phase respectively,means to correlate said representative information to each one of the sample sets ({.phi.(k, T)}) of the signal received from the remote unit, to define a priori optimum sample set,means to select a sample set between said a priori optimum sample set and some of said sample sets defined by sample phases near to the sample phase of said a priori optimum sample set, the selected set being the set producing the smallest equalization error signal with respect to a logic symbol sequence, andcalculation means to minimize an error signal in the equalization means, according, on the one hand, to said signal received from the remote unit when it is sampled with the sample phase of the selected sample set and, on the other, to said logic symbol sequence.