Bit labeling for amplitude phase shift constellation used with low density parity check (LDPC) codes

A transmitter for generating encoded signals, the transmitter comprising:

• a binary Low Density Parity Check (LDPC) encoder configured to transform an input message into a codeword represented by a plurality of set of bits, wherein the N encoded bits are written to a block interleaver column by column and read out row by row;
• and
• logic configured to map non-sequentially, according to the structure of the codeword, one set of bits into a higher order constellation, wherein a symbol of the higher order constellation corresponding to the one set of bits is output based on the mapping for transmission over an Additive White Gaussian Noise (AWGN) channel.

A method for processing encoded signals, the method comprising:

• demodulating a received Low Density Parity Check (LDPC) encoded signal, over an Additive White Gaussian Noise (AWGN) channel, representing a codeword, wherein the encoded signal being modulated according to a non-sequential mapping, based on the structure of the codeword, of a plurality of bits corresponding to the codeword, wherein the N encoded bits are written to a block interleaver column by column and read out row by row;
• and
• decoding the codeword associated with the encoded signal.