Patent ID: 6041432
Filing Date: 2000-03-21
Classification: H03M,H04L

Abstract:
An apparatus for encoding a digital signal comprising:encoding means for convolution encoding said digital signal, said encoded digital signal including a bit corresponding to parallel path information;mapping means for mapping said encoded signal onto one of a plurality of predetermined signal points, said signal points being divided into a plurality of subsets, said plurality of subsets comprising at least two groups, each group having at least four subsets, each subset having at least first and second signal points arranged with respect to a reference point, wherein the first and second signal points of a first subset respectively correspond to the first and second signal points of a second subset when said first subset is rotated through an angle .phi. about said reference point, and a respective bit corresponding to respective parallel path information of the first signal point of said first subset being equal to a respective bit corresponding to respective parallel path information of the first signal point of said second subset and a respective bit corresponding to respective parallel path information of the second signal point of said first subset being equal to a respective bit corresponding to respective parallel path information of the second signal point of said second subset; andmodulating means for modulating the mapped signal,wherein the respective bit corresponding to respective parallel path information is the most significant bit of said digital signal.