Satellite communication method and apparatus

A satellite communication method, wherein the method comprises:

• obtaining, by a sending apparatus, an information transport block, wherein the information transport block comprises K code blocks, and K is a positive integer greater than or equal to 2;
• generating a redundant code block based on at least two of the K code blocks, wherein lengths of each of the at least two code blocks are equal to each other;
• separately performing channel coding on the at least two code blocks and the redundant code block;
• and
• sending, by the sending apparatus over a satellite channel, the at least two code blocks and the redundant code block on which channel coding has been performed;
• obtaining, by a receiving apparatus, to-be-decoded information through the satellite channel, wherein the to-be-decoded information comprises log-likelihood ratios obtained after demodulation of the at least two of K code blocks;
• determining an a priori log-likelihood ratio of each to-be-decoded bit of the at least two code blocks based on a log-likelihood ratio obtained after demodulation of the to-be-decoded bit and the log-likelihood ratio obtained after demodulation of the redundant code block;
• determining a combined log-likelihood ratio of each to-be-decoded bit of the at least two of the K code blocks, wherein the combined log-likelihood ratio is obtained by adding the a priori log-likelihood ratio of each to-be-decoded bit and the log-likelihood ratio obtained after demodulation of the to-be-decoded bit;
• and
• obtaining, by the receiving apparatus, a decoding result of the at least two code blocks based on the combined log-likelihood ratio corresponding to each to-be-decoded bit of the at least two code blocks.