LDPC码的和积算法，码长可以任意，输出多项式即可，译码输出软信息-Sum-product algorithm for LDPC codes, code length can be arbitrary, the output polynomials can be, decoder outputs soft information

LDPC 码二进制规则码生成矩阵512*1024，效果很理想-LDPC code rules binary code matrix to generate 512* 1024, the effect is very satisfactory