ENCRYPTION METHODS, COMMUNICATION SYSTEMS, AND DECODING METHODS

Abstract

The invention describes a decoding method and a communication system related to the method, including: encoding the input bit sequence using a low-density parity-check (LDPC) matrix, where the underlying graph of the LDPC matrix is ​​represented by an m-row, π-column matrix, where m is an integer greater than or equal to 5, and n is an integer greater than or equal to 2π; the underlying graph includes at least submatrix A and submatrix B; submatrix A is a 5-row, 2π-column matrix; and submatrix B is a 5-row, 5π-column matrix, and submatrix B includes a column with weight 3 and a submatrix with a two-diagonal structure. According to the method and system in the invention, encoding requirements for bit sequences of varying lengths can be supported. The invention also describes a decoding method.