Patent ID: 7559010

Claim:
A communication device that is operable to generate an LDPC (Low Density Parity Check) coded signal, the communication device comprising: an LDPC encoder that is operable to encode at least one information bit using a generator matrix, G, that has a corresponding parity check matrix, H, thereby generating an LDPC codeword that comprises at least one LDPC coded bit and at least one uncoded bit, wherein the at least one LDPC coded bit and the at least one uncoded bit of the LDPC codeword are arranged thereby forming a plurality LDPC symbols; and a symbol mapper that is operable to map the plurality of LDPC symbols according to a substantially evenly distributed 128 2-D (128 2-Dimensional) constellation, wherein the substantially evenly distributed 128 2-D constellation is generated from a 2-D 12-PAM (2-Dimensional 12-Pulse Amplitude Modulation) constellation comprising 144 possible constellation points that is evenly partitioned into 9 regions such that each region comprises 16 possible constellation points therein and such that 8 of the 9 regions comprise 14 constellation points therein and 1 of the 9 regions comprises all 16 possible constellation points therein.