A method and apparatus are provided for a coding process of a communication signal. A 3-stripes parity-check matrix is generated from a parity-check matrix of a Gilbert low density parity-check code, where the parity-check matrix of the Gilbert low density parity-check code has a first stripe containing identity matrices and a second stripe containing cyclic permutation matrices. A third stripe is added to form a 3-stripes parity-check matrix, which may be applied to the coding process of information in a communication channel.