Method and apparatus for generating a low-density parity check code

摘要

A low density parity check (LDPC) code generating method and apparatus are provided. A parity check matrix with (N-K) rows for check nodes and N columns for variable nodes are formed to encode an information sequence of length K to a codeword of length N. The parity check matrix is divided into an information part matrix with K columns and a parity part matrix with (N-k) columns. The parity part is divided into PxP subblocks. P is a divisor of (N-K). First and second diagonals are defined in the parity part matrix and the second diagonal is a shift of the first diagonal by f subblocks. Shifted identity matrices are placed on the first and second diagonals and zero matrices are filled elsewhere. An odd number of delta matrices each having only one element of 1 are placed in one subblock column of the parity part matrix. The parity check matrix is stored.