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, where N is an integer greater than 0, the to-be-decoded sequence is 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 in 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, C=E+F, wherein 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 C is 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 thereby obtaining 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 thereby obtaining 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 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 in 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, where A is an integer greater than 0, C is an integer greater than 0, and C is 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 thereby obtaining a channel decoding value of the fourth bit sequence, where 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 thereby obtaining a source decoding value of the first bit sequence, where 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
• outputting the source decoding value of the first bit sequence in response to the channel decoding value of the third bit sequence being the same as the source decoding value of the third bit sequence, or q being equal to Q, where Q is a maximum quantity of iterations, and Q is an integer greater than 0, and q is an integer.