Emerging new wireless technologies and devices to capture and broadcast high-resolution videos in real-time, demand higher data transfer rates. To increase the bit rate, the communication systems always are under development. In the meantime, the other objective is low power consumption, especially for mobile devices like phones and cameras. This achievement requires an optimum design of the elements in a transmission chain. One of the possibilities is optimizing the modulator block. Most of the standard communication systems like DVB-T, use the traditional uniform constellations to map multiple information bits to a constellation symbol. Optimizing the constellation leads to obtain "non-uniform" constellations.