Soft information scaling for iterative decoding

G - Physics – 06 – F

Patent

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Details

G06F 7/60 (2006.01) G06F 7/02 (2006.01) G06F 11/00 (2006.01) G06F 17/10 (2006.01) H03M 13/00 (2006.01) H04L 1/00 (2006.01)

Patent

CA 2516541

Methods and apparatus for scaling soft values (214) as part of an error correction decoding process are described. Accurate decoding depends on use of the appropriate scale factor. Selection and use of the scale factor to scale soft values is designed to improve and/or optimize decoder performance without the need for prior knowledge of the correct scale factor or the actual channel conditions at the time the signal from which the soft values were obtained was transmitted through a communications channel. The techniques of the present invention assumes that the soft values to be processed were transmitted through a communications channel having a quality that can be accurately described by a channel quality value (200). A scale factor is determined from the distribution of soft value (208) to be scaled (212) and an assumption that the channel through which they were transmitted was of the quality corresponding to a pre-selected channel quality value (210).

L'invention concerne des procédés et des dispositifs pour la mise à l'échelle de valeurs programmables (214), en décodage de correction d'erreur. La précision du décodage dépend de l'utilisation d'un facteur d'échelle approprié. La sélection et l'utilisation du facteur d'échelle pour cette mise à l'échelle permet d'améliorer et/ou d'optimiser la performance du décodeur, sans nécessairement connaître auparavant le facteur d'échelle correct ou les conditions de canal effectives au moment de la transmission, sur le canal de communication, du signal dont émanent les valeurs programmables. Aux fins de la technique considérée, on suppose que les valeurs programmables ont été transmises via un canal ayant une qualité susceptible d'être décrite avec précision par une valeur de qualité de canal (200). On détermine un facteur d'échelle à partir de la distribution des valeurs programmables (208) à mettre à l'échelle (212), l'hypothèse étant que le canal utilisé pour la transmission des valeurs a la qualité correspondant à une valeur de qualité de canal présélectionnée (210).

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