Communication method and apparatus

A communication method, comprising:

• receiving a to-be-decoded sequence, wherein a length of the to-be-decoded sequence is N, N is an integer greater than 0, the to-be-decoded sequence is a sequence obtained after a fifth bit sequence is transmitted through a channel, the fifth bit sequence is a channel encoding value of a fourth bit sequence, a first location in the to-be-decoded sequence corresponds to a first bit location in the fourth bit sequence, a third bit sequence is located on the first bit location in the fourth bit sequence, the first bit location in the fourth bit sequence comprises E information bit locations and F frozen bit locations, E+F=C, E is an integer greater than or equal to 0, F is an integer greater than or equal to 0, the third bit sequence is C bits in a first bit sequence, a length of the first bit sequence is A, A is an integer greater than 0, C is an integer greater than 0 and less than or equal to A, a second location in the to-be-decoded sequence corresponds to B information bit locations occupied by a second bit sequence in the fourth bit sequence, the second bit sequence is a source encoding value of the first bit sequence, a length of the second bit sequence is B, and B is an integer greater than 0;
• performing channel decoding on the to-be-decoded sequence to obtain a channel decoding value of the fourth bit sequence, wherein the channel decoding value of the fourth bit sequence comprises a channel decoding value of the second bit sequence and a channel decoding value of the third bit sequence, and a length of the fourth bit sequence is N;
• and
• performing source decoding on the channel decoding value of the second bit sequence to obtain a source decoding value of the first bit sequence.

A communication method, comprising:

• receiving a to-be-decoded sequence, wherein the to-be-decoded sequence is a sequence obtained after a fifth bit sequence is transmitted through a channel, the fifth bit sequence is a channel encoding value of a fourth bit sequence, a first location in the to-be-decoded sequence corresponds to a first bit location in the fourth bit sequence, a third bit sequence is located on the first bit location in the fourth bit sequence, the first bit location in the fourth bit sequence comprises C information bit locations, the third bit sequence is C bits in a first bit sequence, a length of the first bit sequence is A, A is an integer greater than 0, C is an integer greater than 0 and less than or equal to A, a second location in the to-be-decoded sequence corresponds to B information bit locations occupied by a second bit sequence in the fourth bit sequence, the second bit sequence is a source encoding value of the first bit sequence, a length of the second bit sequence is B, and B is an integer greater than 0;
• performing iterative channel decoding for a qth time on the to-be-decoded sequence to obtain a channel decoding value of the fourth bit sequence, wherein q is an integer greater than 0, and the channel decoding value of the fourth bit sequence comprises a channel decoding value of the second bit sequence and a channel decoding value of the third bit sequence;
• performing source decoding for a gth time on the channel decoding value of the second bit sequence to obtain a source decoding value of the first bit sequence, wherein g is an integer greater than 0, and the source decoding value of the first bit sequence comprises a source decoding value of the third bit sequence;
• and
• when the channel decoding value of the third bit sequence is the same as the source decoding value of the third bit sequence, or q is equal to Q, outputting the source decoding value of the first bit sequence, wherein Q is a maximum quantity of iterations, and Q is an integer greater than 0.