Patent ID: 8370700

Claim:
A coding method for low density generator matrix codes including the following steps: step I, constructing a mother code set of low density generator matrix codes by using P low density generator matrix codes of different code lengths at a code rate R 0 , wherein the mother code set of low density generator matrix codes has a uniform basic matrix G b uniform , R 0 = k b n b , k b is a row number of the basic matrix, and n b is a column number of the basic matrix; step II, obtaining a length L of an intermediate variable according to the relationship between a length K of a to-be-coded information bit sequence in the mother code set of low density generator matrix codes and the length L of the intermediate variable; step III, obtaining an expansion factor z k used for processing the basic matrix by utilizing the length L of the intermediate variable and the row number k b of the basic matrix, and obtaining a generator matrix G ldgc by modifying and expanding the basic matrix using the expansion factor z k ; and step IV, coding the to-be-coded information bit sequence using a matrix G ldgc (1:L,1:N+L−K) formed by L rows and the first N+L−K columns of the generator matrix, and sending the coded information bit sequence to a receiving end.