Method and apparatus for channel encoding/decoding in a communication or broadcasting system
A channel encoding method in a communication or broadcasting system is provided. The channel encoding method includes reading a first sequence corresponding to a parity check matrix, converting the first sequence to a second sequence by applying a certain rule to a block size corresponding to a parity check matrix and the first sequence, and encoding information bits based on the second sequence. The block size has at least two different integer values.
1. A method for encoding in a communication or broadcasting system supporting a low density parity check (LDPC) code, the method comprising:
identifying a block size Z;
identifying, from among a plurality of sets of block sizes, a set of block sizes associated with the block size Z;
identifying an exponent matrix including at least one integer value based on the identified set of block sizes;
obtaining a parity-check matrix based on the block size Z and the exponent matrix; and
encoding information bits based on the parity-check matrix,
wherein the parity-check matrix includes a submatrix consisting of Z×Z identity matrices and Z×Z zero matrices, and Z×Z circular permutation matrices.
2. The method of claim 1 , wherein the identifying of the block size comprises:
identifying a size of the information bits to encode; and
identifying the block size based on the size of the information bits.
3. The method of claim 1 , wherein the set of block sizes is associated with block sizes determined among {(A+i), 2(A+i), 22(A+i), . . . , 2S(A+i)}, where i=0, 1, 2, . . . , A−1, and A and S are positive integers.
4. The method of claim 3 , wherein A is 8 and S is 4.
5. The method of claim 1 , wherein the block size is identified based on integer values in a plurality of integer number sets or a length of an information word.
6. The method of claim 1 , wherein the LDPC code is determined based on one of parity check matrices of at least two different sizes.
7. The method of claim 1 , wherein the parity check matrix is obtained based on a circular permutation matrix by applying a circularly shifting operation including one of a modulo operation or a flooring operation.
8. The method of claim 1 , wherein the LDPC code is determined based on one of two or more base matrices.
9. The method of claim 1 , wherein the Z×Z circular permutation matrices are obtained by circularly shifting a Z×Z identity matrix to right once or left once.
10. An encoder in a communication or broadcasting system supporting a low density parity check (LDPC) code, the encoder comprising:
a transceiver;
a memory; and
at least one processor configured to:
identify a block size Z,
identify, from among a plurality of sets of block sizes, a set of block sizes associated with the block size Z,
identify an exponent matrix including at least one integer value based on the identified set of block sizes,
obtain a parity-check matrix based on the block size Z and the exponent matrix, and
encode information bits based on the parity-check matrix,
wherein the parity-check matrix includes a submatrix consisting of Z×Z identity matrices and Z×Z zero matrices, and Z×Z circular permutation matrices.
11. The encoder of claim 10 , wherein the at least one processor is further configured to:
identify a size of the information bits to encode, and
identify the block size based on the size of the information bits.
12. The encoder of claim 10 , wherein the set of block sizes is associated with block sizes determined among {(A+i), 2(A+i), 22(A+i), . . . , 2S(A+i)}, where i=0, 1, 2, . . . , A−1, and A and S are positive integers.
13. The encoder of claim 12 , wherein A is 8 and S is 4.
14. The encoder of claim 10 , wherein the block size is identified based on integer values in a plurality of integer number sets or a length of an information word.
15. The encoder of claim 10 , wherein the LDPC code is determined based on one of parity check matrices of at least two different sizes.
16. The encoder of claim 10 , wherein the parity-check matrix is obtained based on a circular permutation matrix by applying a circularly shifting operation including one of a modulo operation or a flooring operation.
17. The encoder of claim 10 , wherein the LDPC code is determined based on one of two or more base matrices.
18. The encoder of claim 10 , wherein the Z×Z circular permutation matrices are obtained by circularly shifting a Z×Z identity matrix to right once or left once.
19. A method for decoding in a communication or broadcasting system supporting a low density parity check (LDPC) code, the method comprising:
receiving a signal from a transmitter; and
obtaining a bit sequence by decoding the signal,
wherein the decoding of the signal is performed based on a parity-check matrix,
wherein the parity-check matrix is based on an exponent matrix including at least one integer value,
wherein the exponent matrix is based on a set of block sizes from among a plurality of sets of block sizes,
wherein the set of block sizes is based on a block size Z, and
wherein the parity-check matrix includes a submatrix consisting of Z×Z identity matrices and Z×Z zero matrices, and Z×Z circular permutation matrices.
20. The method of claim 19 , wherein the block size is based on a size of information bits.
21. The method of claim 19 , wherein the set of block sizes is associated with block sizes determined among {(A+i), 2(A+i), 22(A+i), . . . , 2S(A+i)}, where i=0, 1, 2, . . . , A−1, and A and S are positive integers.
22. The method of claim 21 , wherein A is 8 and S is 4.
23. The method of claim 19 ,
wherein the set of block sizes is based on a block size, and
wherein the block size is based on integer values in a plurality of integer number sets or a length of an information word.
24. The method of claim 19 , wherein the LDPC code is based on one of parity check matrices of at least two different sizes.
25. The method of claim 19 , wherein the parity-check matrix is based on a circular permutation matrix by applying a circularly shifting operation including one of a modulo operation or a flooring operation.
26. The method of claim 19 , wherein the LDPC code is determined based on one of two or more base matrices.
27. The method of claim 19 , wherein the Z×Z circular permutation matrices are obtained by circularly shifting a Z×Z identity matrix to right once or left once.
28. A decoder in a communication or broadcasting system supporting a low density parity check (LDPC) code, the decoder comprising:
a transceiver;
a memory; and
at least one processor configured to:
control the transceiver to receive a signal from a transmitter, and
obtain a bit sequence by decoding the signal,
wherein the decoding of the signal is performed based on a parity-check matrix,
wherein the parity-check matrix is based on an exponent matrix including at least one integer value,
wherein the exponent matrix is based on a set of block sizes from among a plurality of sets of block sizes,
wherein the set of block sizes is based on a block size Z, and
wherein the parity-check matrix includes a submatrix consisting of Z×Z identity matrices and Z×Z zero matrices, and Z×Z circular permutation matrices.
29. The decoder of claim 28 , wherein the block size is based on a size of an information bits.
30. The decoder of claim 28 , wherein the set of block sizes is associated with block sizes determined among {(A+i), 2(A+i), 22(A+i), . . . , 2S(A+i)}, where i=0, 1, 2, . . . , A−1, and A and S are positive integers.
31. The decoder of claim 30 , wherein A is 8 and S is 4.
32. The decoder of claim 28 ,
wherein the set of block sizes is based on a block size, and
wherein the block size is based on integer values in a plurality of integer number sets or a length of an information word.
33. The decoder of claim 28 , wherein the LDPC code is based on one of parity check matrices of at least two different sizes.
34. The decoder of claim 28 , wherein the parity-check matrix is based on a circular permutation matrix by applying a circularly shifting operation including one of a modulo operation or a flooring operation.
35. The decoder of claim 28 , wherein the LDPC code is determined based on one of two or more base matrices.