UIBF decoding to lower the error floors of high-rate systematic LDPC codes

Abstract

An unreliability-based information bit flipping (UIBF) decoding using cyclic redundancy check is proposed to lower the error floors of high-rate systematic low-density parity-check (LDPC) codes. Unsuccessfully decoded codeword is redecoded by the UIBF decoding with very low complexity at the end of every iteration of the sum-product (SP) decoding. The proposed scheme is applied to LDPC codes of the IEEE 802.16e standard. Simulation results show that the proposed scheme effectively lowers the error floors of systematic LDPC codes with smaller number of iterations compared with the conventional SP decoding scheme, which leads to the reduced power consumption and increased data throughput.