Decision feedback equalizer method and apparatus

H - Electricity – 04 – B

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H04B 3/04 (2006.01) H04L 25/06 (2006.01) H04L 27/01 (2006.01)

Patent

CA 2140356

A decision feedback equalizer is suitable for use with a bipolar return-to-zero receiver. The equalizer determines an output Y(n) (160) based on a compensated received value X(n) (104) and a correction factor, D(n) (141). After receiving X(n), the equalizer then forms an equalized received value X'(n) (107) based on combining X(n) with D(n). The equalizer then determines the output value Y(n) based on comparing X'(n) with a positive threshold, V1 and a negative threshold, V2. When Y(n) is determined to be zero, the equalizer adjusts the stored correction value D(n) by a predetermined value, .DELTA., based on whether X'(n) is positive or negative.

Egaliseur à retour de décision pour récepteur bipolaire à remise à zéro. Ledit égaliseur fixe une valeur de sortie Y(n) (160) en se basant sur une valeur reçue compensée X(n) (104) et sur un facteur de correction D(n) (141). Après réception de X(n), l'égaliseur calcule une valeur reçue égalisée X'(n) (107) résultant d'une combinaison de X(n) et de D(n), puis détermine le valeur de sortie Y(n) en comparant X'(n) à un seuil positif V1 et à un seuil négatif V2. Si Y(n) est nul, l'égaliseur ajuste la valeur corrigée mémorisée D(n), d'une quantité DELTA prédéterminée, fonction du signe positif ou négatif de X'(n).

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