Patent ID: 8548079
Filing Date: 2013-10-01
Classification: H04L

Abstract:
1. A transmitter for transmitting signals obtained by associating a plurality of bit strings with a plurality of signal points represented on a phase plane, respectively, and performing multi-level modulation according to each of the signal points, the transmitter comprising: a multi-level modulator that performs the multi-level modulation with a signal point constellation in which each signal point on the phase plane constitutes a vertex of at least one equilateral triangle with sides of predetermined length and, a distance between a signal point closest to origin on the phase plane and the origin is longer than a reference distance and transmission mean power of all the constellation points is equal to or less than a reference transmission mean power, the reference distance and the reference transmission mean power being values corresponding to the distance and the transmission mean power, respectively, in the case that signal points are arranged in a grid pattern with a spacing of the same length as sides of the equilateral triangle.