CPC H04W 24/02 (2013.01) [H03M 13/255 (2013.01); H03M 13/6325 (2013.01); H04B 15/00 (2013.01); H04B 17/336 (2015.01); H04L 1/0003 (2013.01); H04L 1/0009 (2013.01); H04L 27/3405 (2013.01); H04L 27/3483 (2013.01); H04L 27/3809 (2013.01)] | 60 Claims |
1. A method of transmitting data, comprising:
receiving bits at a transmitter comprising a coder, a mapper, and a modulator;
providing encoded bits to the mapper from the coder via a coupling with the mapper, where the encoded bits are output by the coder based upon the received bits using a Low Density Parity Check (LDPC) code;
mapping the encoded bits to symbols in a symbol constellation using the mapper, where the symbol constellation is selected from a plurality of symbol constellations that includes a group of symbol constellations that each have the same number of constellation points and comprise a ring of constellation points that are unequally spaced along the ring; and
transmitting a signal via a communication channel having a channel signal-to-noise ratio (SNR) based upon symbols received at the modulator via a coupling with the mapper;
wherein labels and spacing of the constellation points in each of the symbol constellations in the group of symbol constellations are arranged such that the symbol constellation is capable of providing a given capacity at a reduced signal-to-noise ratio as compared to a similar symbol constellation that differs only in that the constellation points in the ring are equally spaced around the ring.
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