Patent ID: 8867662
Filing Date: 2014-10-21
Classification: H04L

Abstract:
1. A method of rotating a multidimensional constellation in a communication system, the method comprising: constructing, using a processor, a first rotation matrix, wherein a first column of the first rotation matrix includes first matrix elements based on a number of axes in the multidimensional constellation, and wherein additional columns of the first rotation matrix include a first set of permutations of the first matrix elements; constructing, using the processor, a second rotation matrix, wherein a first column of the second rotation matrix includes the first matrix elements based on the number of axes in the multidimensional constellation, and wherein additional columns of the second rotation matrix include a second set of permutations of the first matrix elements; applying orthogonality constraints to the first rotation matrix and to the second rotation matrix; selecting an optimizing rotation matrix from one of the first rotation matrix and the second rotation matrix; and rotating the multidimensional constellation using the optimizing rotation matrix.