Modem including an equalizer for amplitude jitter

Details Modem including an equalizer for amplitude jitter Modem including an equalizer for amplitude jitter

H - Electricity

03

H

H03H 17/02 (2006.01) H04L 27/38 (2006.01)

Patent

CA 2128609

A modem (100) includes an equalizer for equalizing a received signal (10) for amplitude jitter distortion. The received signal includes modulated symbols based on a predetermined constellation of points, each point representing a symbol. The modem first extracts a modulated symbol to provide an extracted symbol, R(k), which includes amplitude jitter distortion. The modem then identifies a signal point Pn(k) of the predetermined constellation corresponding to the extracted symbol. Further, the modem determines an error signal (76) based on the amplitude jitter distortion, and then uses the error signal to compensate subsequent extracted symbols for the amplitude jitter distortion.

L'invention est un modem (100) comportant un égaliseur servant à égaliser un signal reçu (10) pour éliminer les instabilités d'amplitude. Le signal reçu contient des symboles modulés basés sur une constellation prédéterminée de points, chaque point représentant un symbole. Le modem extrait d'abord un symbole modulé pour produire un symbole extrait R(k) comportant des instabilités d'amplitude. Le modem identifie ensuite dans le signal un point Pn(k) de la constellation prédéterminée correspondant au symbole extrait. Finalement, le modem produit un signal d'erreur (76) basé sur l'instabilité d'amplitude et utilise ce signal pour corriger les instabilités d'amplitude des symboles extraits par la suite.

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