APPARATUS AND METHOD FOR CHANNEL ENCODING AND DECODING IN COMMUNICATION SYSTEM USING LOW-DENSITY PARITY-CHECK CODES

摘要

The present invention relates to a method and an apparatus for encoding and decoding a channel in a communications system, and particularly, to a method and an apparatus for encoding and decoding a channel, in which various codeword sizes are generated from a structural low density parity check (LDPC) code when using an LDPC code in the communications system employing a high order modulation scheme. The present invention provides a method for obtaining a punctured pattern optimized by taking the high order modulation scheme into consideration when applying puncturing or shortening to provide various codeword lengths. After performing the shortening when the shortening is required, a parity inspection matrix is used to encode information data bits by a preset encoding scheme such that the LDPC codeword is generated and the optimized puncturing pattern is employed and transmitted when information data bits are inputted.