LDPC码的仿真研究，包括LDPC码的生成、H矩阵的生成、编码、解码等程序，并附有在不同调制、码长、列重情况下的仿真图-LDPC code simulation studies, including the generated LDPC code, the generation of the H matrix, the encoding, decoding, and other procedures, together with the different modulation code len