Patent ID: 8422579
Filing Date: 2013-04-16
Classification: H04L

Abstract:
1. A method of Quadrature Amplitude Modulation (QAM), comprising: creating a QAM signal point constellation, the QAM signal point constellation comprising 64 points, arranged in a square array with 16 points in each of four quadrants defined by I and Q axes intersecting at an origin of a phase-plane diagram, the signal points in each quadrant of the square array having I and Q relative component amplitudes of 1, 3, 5, and 7 units; modifying the square array by eliminating an inner most 4 constellation points, located at the complex positions 1+1j, −1+1j, −1−1j and 1−1j, and an outer most 4 constellation points, located at the complex positions 7+7j, −7+7j, −7−7j and 7−7j; replacing the inner most 4 constellation points and the outer most 4 constellation points with new constellation points located at the complex positions 9+1j, 1+9j, −1+9j, −9+1j, −9−1j, −1−9j, 1−9j and 9−1j; and resulting in the signal points in ach quadrant of the a modified-square array with 16 points in each of four quadrants defined by I and Q axes intersecting at an origin of a phase-plane diagram, the signal points in each quadrant of the modified-square array having I and Q relative component amplitudes of 1, 3, 5, 7, and 9 units.