Abstract: A method includes performing source encoding on a first bit sequence thereby obtaining a second bit sequence, obtaining a fourth bit sequence based on the second bit sequence and a third bit sequence, performing channel encoding on the fourth bit sequence thereby obtaining a fifth bit sequence and sending the fifth bit sequence. The fourth bit sequence includes one or more information bits and one or more frozen bits. The first bit location includes E information bit locations and F frozen bit locations. A length of the first bit sequence is A. A is an integer greater than 0. A length of the second bit sequence is B. B is an integer greater than 0. The third bit sequence is C bits in the first bit sequence. C is an integer greater than 0. C is less than or equal to A.

Abstract: This application discloses a polar encoding method and apparatus and a polar decoding method and apparatus, to apply polar codes to source coding and decoding, to improve source coding and decoding performance.

Abstract: This application provides a communication method and apparatus. The method includes: performing source encoding on a first bit sequence to obtain a second bit sequence; obtaining a fourth bit sequence based on the second bit sequence and a third bit sequence; performing channel encoding on the fourth bit sequence to obtain a fifth bit sequence; and sending the fifth bit sequence. The third bit sequence is C bits in the first bit sequence, the fourth bit sequence includes one or more information bits and one or more frozen bits, the second bit sequence is located on B information bit locations in the fourth bit sequence, the third bit sequence is located on a first bit location in the fourth bit sequence, the first bit location includes E information bit locations and F frozen bit locations, E+F=C, E is an integer and E?0, and F is an integer greater and F?0.

Abstract: This application discloses a polar encoding method and apparatus and a polar decoding method and apparatus, to apply polar codes to source coding and decoding, to improve source coding and decoding performance.