Equalization and decoding for digital communication channel

H - Electricity – 03 – M

Patent

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Details

H03M 13/00 (2006.01) H03M 13/25 (2006.01) H03M 13/41 (2006.01) H04L 25/02 (2006.01) H04L 25/03 (2006.01) H04L 27/01 (2006.01)

Patent

CA 2083304

An equalizer/decoder for a communication channel presenting impairments to error-free reception of transmitted symbols includes a modified Viterbi decoder operating on samples of received signals in a plurality of equivalent subchannels. Estimates of each of the subchannels are updated using a locally best estimate in the Viterbi trellis processing, thereby avoiding delay in updating channel estimates in a rapidly changing channel such as a digital cellular communications channels. A leaky predictor channel updating technique also proves advantageous in an alternative embodiment.

L'invention est un égaliseur-décodeur pour canaux de communication présentant des insuffisances en rapport avec la réception sans erreur de symboles transmis; l'appareil de l'invention utilise un décodeur de Viterbi modifié qui opère sur des échantillons des signaux reçus dans une pluralité de sous-canaux équivalents. Des estimations des signaux de chacun de ces sous-canaux sont mises à jour au moyen d'une estimation optimale locale dans le traitement en treillis de Viterbi, ce qui évite les retards dans la mise à jour des estimations des signaux dans les canaux à variations rapides, tels que les canaux de systèmes de communication cellulaires numériques. L'utilisation d'une méthode de mise à jour des canaux de prédiction fuyants s'avère avantageuse dans une seconde concrétisation de l'invention.

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