Improved Perturbation Method for Decoding of LDPC Aided by CRC

In this paper, a fresh belief propagation (BP) decoding algorithm is proposed. The proposed decoding algorithm with improved perturbation method is designed for short length low density parity-check (LDPC) codes aided by cyclic redundancy check (CRC). In the proposed algorithm corresponding to path size L, L decoding paths are considered concurrently. Then, a single codeword is selected according to the checking results of CRC. Simulation results show that the modified CRC-aided decoding scheme can enhance the error-correcting performance of short LDPC codes effectively.