Multidimensional trellis-coded communication system

H - Electricity – 04 – L

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H04L 27/34 (2006.01)

Patent

CA 2115946

A trellis-coded modulation system is provided in which the output of the trellis encoder (110) is used to select a subset of a multidimensional QAM constellation, The selection process is performed such that a) the minimum square Euclidean distance between valid sequences of successive selected subsets is maximized, b) the resulting code is rotationally invariant, and c) the selected subset corresponding to a transition of the trellis encoder from a present state i to a different next state j is different from the selected subset that corresponds to a transition of the trellis encoder from a present state j to a next state i.

L'invention est un système de modulation à codage en treillis dans lequel le codeur (110) est utilisé pour sélectionner un sous-ensemble d'une constellation multidimensionnelle de modulation d'amplitude en quadrature. Le processus de sélection est effectué de telle façon que a) le minimum du carré de la distance euclidienne entre les suites valides de sous-ensembles sélectionnés successifs est maximisée, b) le code résultant est invariant par rotation et c) le sous-ensemble sélectionné correspondant à une transition du codeur de l'état du moment i à un état suivant différent j est différent du sous-ensemble correspondant à une transition de l'état du moment j à un état suivant i.

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