LDPC decoding method for improving minimum offset sum based on density evolution

The invention relates to the technical field of mobile communication, in particular to an LDPC decoding method for improving minimum offset sum based on density evolution. The method comprises the following steps of calculating a channel message value received by a variable node; updating a check node and the variable node, and updating the external information transmitted between the check node and the variable node by using an optimal offset factor value; calculating a hard decision value of the variable node, and performing hard decision; and judging whether the hard decision meets a checkmatrix, and if so, outputting the hard decision as a decoding result. According to the method, the LLR message values before and after variable node updating are used for weighting in the number domain, so that the oscillation of the LLR information of the variable node during the decoding process is relieved, and the decoding convergence speed is increased; a density evolution method and the weighted average are adopted