Encoding and decoding method of low-density parity-check code

An encoding and decoding method of low-density parity-check code adapted to encoding or decoding data in a wireless communication network, the method being performed by a computing device and comprising following steps of:

• converting a high rate check code to a check matrix having a protograph;
• extending the check matrix to form an extended base matrix and splitting the check matrix to form a split base matrix;
• respectively calculating the extended base matrix and the split base matrix to generate a decoding threshold of the extended base matrix and the split base matrix by using a protograph extrinsic information transfer chart, wherein one of the extended base matrix and the split base matrix with the lower decoding threshold is considered as a low rate base matrix;
• repeating the above steps until a stop condition is satisfied;
• the low rate base matrix satisfied with the stop condition to form a parity check matrix;
• and
• encoding and decoding transmission data by the parity check matrix.