Transmitting apparatus and interleaving method thereof

An interleaving method of a transmitting apparatus, comprising:

• encoding input bits to generate parity bits using a Low Density Parity Check (LDPC) code according to a code rate of 5/15 and a code length of 16200;
• interleaving an LDPC codeword comprising the input bits and the parity bits;
• and
• mapping the interleaved LDPC codeword onto constellation points for QPSK,
• wherein the interleaving comprises:
• splitting the LDPC codeword into a plurality of bit groups;
• and
• interleaving the plurality of bit groups,
• wherein the interleaving the plurality of bit groups comprises interleaving the plurality of bit groups using a following equation:
• Yj=Xπ(j)
• for
• (0≦j<Ngroup),
• where Xj is a jth bit group among the plurality of bit groups, Yj is an interleaved jth bit group, Ngroup is a total number of the plurality of bit groups, and π(j) denotes a permutation order for the interleaving, and
• wherein the π(j) is defined as follows:
• Order of Interleaving
• π(j) (0 ≦ j < 45)
• Code Rate
• 0
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 5/15
• 35
• 7
• 29
• 11
• 14
• 32
• 38
• 28
• 20
• 17
• 25
• 39
• 5
• 13
• 34
• 37
• 23
• 15
• 36
• 18
• 42
• 16
• 33
• 31
• Code Rate
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 5/15
• 19
• 4
• 1
• 12
• 10
• 30
• 0
• 44
• 43
• 2
• 21
• 27
• 22
• 3
• 6
• 40
• 24
• 41
• 9
• 26
• 8.