Baseband signal coding method based on LDPC (Low Density Parity Check) code

A baseband signal coding method based on an LDPC code relates to the technical field of baseband signal coding, and comprises the following steps: coding an original baseband signal according to a preset LDPC coding parameter of a communication link, generating a coded signal, and transmitting the coded signal; the receiving end decodes the received code word to obtain an estimated bit sequence of the original baseband data and the bit error rate of the current feedback sliding window of each communication link; the receiving end obtains the signal-to-noise ratio level of each communication link according to the bit error rate of each communication link and the lookup table, generates an optimal LDPC coding parameter according to the lookup table, the bit error rate threshold, the occupied bandwidth corresponding to the code words generated by different LDPC coding parameters, the residual bandwidth of each communication link and the signal-to-noise ratio level, and feeds back the optimal LDPC coding paramete