Method and apparatus for mappping an eight dimensional...

H - Electricity – 03 – M

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H03M 7/00 (2006.01) H04L 27/34 (2006.01)

Patent

CA 2087527

A mapping technique for a mapper (30) utilizes 29 bits for defining all points of an 8D constellation which is comprised of a desired subset of a concatenation of four 2D constellations, where each 2D constellation has 160 or 192 points. The mapping technique generally comprises: dividing each 2D constellation into 5 or 6 different energy groups of 32 points each, the concatenation of four groups, one from each 2D constellation, comprising an 8D grouping; choosing 512 8D groupings from the possible 54 (or 6a) 8D groupings available; partitioning each group of 32 points into four subgroups, each subgroup of a group being a 90, 180, or 270 degree rotation of a first particular subgroup of the group; and defining each 8D constellation point by using 9 bits to choosy the 8D grouping, 8 bits to choose four subgroups in the 8D grouping, one for each 2D constellation, and 12 bits to choose four 2D points, one in each chosen subgroup, the four 2D points comprising the 8D point. The chosen 512 8D groups are preferably the lowest energy 8D groupings.

Une technique de topographie destinée à un dispositif de topographie (30) utilise 29 bits afin de définir tous les points d'une constellation 8D composée d'un sous-ensemble voulu d'une concaténation de quatre constellations 2D, chaque constellation 2D comportant 160 ou 192 points. La technique de topographie consiste: à diviser chaque constellation 2D en 5 ou 6 groupes d'énergie différents de 32 points chacun, la concaténation de quatre groupes, un de chaque constellation 2D, comprenant un groupement 8D; à choisir 512 groupements 8D à partir des groupements possibles 54 (ou 64) 8D disponibles; à compartimenter chaque groupe de 32 points en quatre sous-groupes, chaque sous-groupe d'un groupe étant une rotation à 90, 180 ou 270 degrés d'un premier sous-groupe particulaire du groupe; et à définir chaque point de constellation 8D à l'aide de 9 bits afin de choisir le groupement 8D, de 8 bites afinde choisir quatre-sous groupes dans le groupement 8D, un pour chaque constellation 2D, et à l'aide de 12 bits afin de choisir quatre points 2D, un dans chaque sous-groupe choisi, les quatre points 2D comprenant le point 8D. Les 512 groupes 8D choisis sont de préférence les groupements 8D présentant l'énergie la plus faible.

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