Patent ID: 7917829

Claim:
A method for low-density parity-check (LDPC) encoding data, comprising: receiving input data from a data source; applying the following expanded parity check matrix to the input data to generate encoded data with a code length of 1944: 61 75 4 63 56 −1 −1 −1 −1 −1 −1 8 56 74 77 20 −1 −1 −1 64 24 4 67 −1 28 21 68 10 7 14 65 −1 −1 −1 23 −1 48 38 43 78 76 −1 −1 −1 −1 5 36 −1 40 2 53 25 −1 52 62 −1 20 −1 −1 44 69 23 64 10 22 −1 21 −1 −1 −1 −1 −1 12 0 68 20 55 61 −1 40 −1 −1 −1 52 58 8 34 64 78 −1 −1 11 78 24 −1 −1 −1 2 17 25 1 0 −1 −1 −1 −1 −1 −1 7 −1 −1 −1 −1 0 0 −1 −1 −1 −1 −1 −1 −1 75 −1 −1 −1 0 0 −1 −1 −1 −1 15 72 −1 −1 −1 −1 −1 0 0 −1 −1 −1 −1 −1 −1 −1 0 −1 −1 −1 0 0 −1 −1 68 23 29 −1 −1 −1 −1 −1 −1 0 0 −1 −1 −1 −1 44 −1 −1 −1 −1 −1 −1 0 0 −1 −1 −1 58 1 −1 −1 −1 −1 −1 −1 0 wherein −1represents an 81×81 all-zero square matrix, and all other integers represent an 81×81 identity matrix, circularly right shifted a respective number of times corresponding to the respective integers.