METHOD AND APPARATUS FOR MAPPING AN EIGHT DIMENSIONAL CONSTELLATION OF A CONVOLUTIONALLY CODED COMMUNICATION SYSTEM

摘要

a device for a terrain topography (30) using 29 bits to define all the points of a constellation consisting of a subset of d to a concatenation of four 2d constellations, each constellation points or 2d with 160 192.the technique is to divide each constellation topology 2d 5 or 6 different energy groups of 32 points, the concatenation of the four groups, each group consisting of a constellation of 2d, 8d, 8d from to 512 groups groups as possible 5 d 4 (or 64); to divide each group into four sub groups, 32 points.every subgroup of a group is rotated at 90, 180 or 270 degrees from a first group of particle group; and define each constellation point 8d with 9 bits to select the group d, 8 cocks to choose four subgroups in group d, a for each constellation, 2d, and with 12 bits to select four points in 2d.in each group, the four points of the 2d 512 8d, 8d. groups are preferably selected from groups d with lowest energy.