Research on LDPC Decoding Based on Modified Min-sum Algorithm

In order to make up for the performance defects of Min-sum decoding algorithm relative to LLR BP decoding algorithm and reduce implementation complexity of LLR-BP algorithm,a modified Min-sum decoding algorithm is proposed.When the check nodes process the message,parameters of the proposed algorithm are confirmed according to minimum mean square error rule,and the normalized BP-based decoding algorithm and the offset BP-based decoding algorithm are integrated effectively.At the same time,we introduce the correction factor and the offset factor into this algorithm reasonably.The simulation results show that decoding performance of modified Min-sum decoding algorithm is more effective than that of Min-sum decoding algorithm,normalized BP-based decoding algorithm and offset BP-based decoding algorithm under the same condition of bit error rate,and it approaches to the performance of LLR-BP decoding algorithm.