Apparatus and methods accounting for automatic gain control...

H - Electricity – 04 – L

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H04L 25/02 (2006.01) H03G 3/20 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2678113

Apparatus and methods are provided for accounting for the effects of automatic gain control (AGC) in a multi carrier communications system when combining pilot tone interlaces by essentially reversing the effects of the AGC. In an aspect, a method for adjusting for the effects of automatic gain control when combining pilot interlaces in an interlace filter of a communication system is disclosed. The method includes determining a normalization gain of an applied automatic gain control normalized to a predefined time (604). Additionally, two or more combining coefficients for an interlace filter are determined based on a selected criterion (606). Each of the two or more combining coefficients is then modified based on the determined normalization gain (608) to yield adjusted combining coefficients. Corresponding apparatus are also disclosed.

L'invention concerne un appareil et des procédés pour rendre compte des effets de la commande automatique de gain (AGC) dans un système de communication multiporteuse lors de la combinaison d'entrelacements de tonalité pilote en inversant essentiellement les effets de l'AGC. Dans un aspect, un procédé pour ajuster les effets de la commande automatique de gain lors de la combinaison d'entrelacements pilotes dans un filtre d'entrelacement d'un système de communication est décrit. Le procédé comprend la détermination d'un gain de normalisation d'une commande automatique de gain appliqué normalisée à un temps prédéterminé (604). De plus, deux coefficients de combinaison ou plus pour un filtre d'entrelacement sont déterminés en fonction d'un critère sélectionné (606). Chacun des deux coefficients de combinaison ou plus est ensuite modifié en fonction du gain de normalisation déterminé (608) pour donner les coefficients de combinaison ajustés. Des appareils correspondants sont également décrits.

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