Patent ID: 6574285
Filing Date: 2003-06-03
Classification: H04L

Abstract:
A communications system, comprising:a modulator for modulating a digital data stream onto a carrier wave to generate a modulated signal, the modulator converting data in the data stream into symbols for transmission by the communications system, the symbols being encoded into one of M possible symbols of an M-ary constellation, wherein each symbol is defined by one of a plurality of phases and one of a plurality of magnitudes; and an amplifier for amplifying the modulated signal prior to transmission to generate an amplified signal, the amplifier having a non-linear characteristic that generates a non-linear distortion in the modulated signal, wherein the M-ary constellation is a 128 point constellation having 48 points defined by a first magnitude, 32 points defined by a second magnitude, 24 points defined by a third magnitude, 16 points defined by a fourth magnitude, and 8 points defined by a fifth magnitude, wherein the second magnitude is less than the first magnitude, the third magnitude is less than the second magnitude, the fourth magnitude is less than the third magnitude, and the fifth magnitude is less than the fourth magnitude.