Adaptive threshold decision device for multistate modulation

Details Adaptive threshold decision device for multistate modulation Adaptive threshold decision device for multistate modulation

H - Electricity

04

L

H04L 27/26 (2006.01) H04L 25/06 (2006.01)

Patent

CA 2122561

An adaptive threshold decision device for multistate modulation produces, at a symbol frequency, symbols dependent on the levels of a received demodulated baseband signal. It comprises a voltage divider, an adder for adding the baseband signal to a midpoint voltage which is substantially the mean of lower and upper voltages applied to the terminals of the voltage divider to produce a transposed signal, plural comparator means for comparing the transposed signal with plural voltages at terminals of the voltage divider thereby producing comparison result signals, an encoder for deriving control words according to the comparison result signals, and control means for respectively and independently controlling at least the lower and upper voltages according to the control words.

Dispositif de décision à seuil adaptatif pour modulation multi-état, produisant, à une fréquence donnée, des symboles en fonction d'un signal de bande de base démodulé reçu. Comprend un diviseur de tension, un additionneur pour l'ajout d'un signal de bande de base à une tension de point médian correspondant sensiblement à la moyenne de la tension inférieure et de la tension supérieure appliquées aux bornes du diviseur de tension afin de produire un signal transposé, plusieurs moyens de comparaison pour comparer le signal transposé à plusieurs tensions aux bornes du diviseur de tension de manière à produire des signaux de résultats de comparaison, un codeur pour obtenir des mots de commande conformément aux signaux de résultats de comparaison, et des moyens de commande pour commander respectivement et indépendamment au moins la tension inférieure et la tension supérieure en fonction des mots de commande.

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