关键词: LDPC码, 加权比特翻转, 符号可信度

Abstract: Bit-Flopping（BF） algorithm and several Weighted BF（WBF） algorithms are investigated, based on which, a new improved WBF（IWBF） decoding algorithm for LDPC codes is proposed. The error metric in WBF considers the check information. Based on that, the IWBF algorithm further considers the impact of message reliability on the symbol decision, but the weighting parameters must be obtained through simulation to achieve better decoding performance. Considering both the check information and the message reliability, the new IWBF decoding algorithm can achieve better decoding performance, but do not bother to choose the weighting parameters. The simulation results show that the proposed algorithm is effective, and can achieve a good decoding performance.

Key words: LDPC codes, Weighted Bit-Flipping（WBF）, message reliability