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

摘要

A device and a method for coding and decoding a channel are provided to secure expandability and mobility of the system by generating the LDPC code with a variable length using the parity check matrix. An LDPC code parity check matrix extracting unit(1140) extracts the reduced LDPC code parity check matrix. A controller(1110) controls a reduction pattern applying unit(1120) to determine the variable reduction pattern in consideration of the effective reception range according to the length of the information word. The reduction pattern applying unit inserts the bit with 0 into the position corresponding to the reduced bit. The reduction pattern applying unit removes the row corresponding to the reduced bit in the parity check matrix of the LDPC code. The controller determines the punching pattern suitable for the length of the bit to be punched and the modulation method. The controller controls a punching pattern applying unit(1180) to apply the determined punching pattern. An LDPC coder(1160) performs the coding based on the reduced LDPC code by the controller and the reduction pattern applying unit.