Receiving apparatus and de-interleaving method thereof

A television (TV) broadcast receiving apparatus comprising:

• a receiver configured to receive a broadcast signal from a TV broadcast transmitting apparatus;
• a demodulator configured to demodulate the signal to generate values according to a quadrature phase shift keying (QPSK) modulation;
• a deinterleaver configured to split the values into a plurality of groups and deinterleave the plurality of groups to provide deinterleaved values;
• and
• a decoder configured to decode the deinterleaved values based on a low density parity check (LDPC) code having a code rate being 5/15 and a code length being 16200 bits,
• wherein the plurality of groups are deinterleaved based on a following equation:
• Yπ(j)=Xj for (0≤j<Ngroup),
• where Xj is a jth group among the plurality of groups, Yj is a jth group among the deinterleaved plurality of groups, Ngroup is a total number of the plurality of groups, and π(j) denotes a deinterleaving order for the deinterleaving, and
• wherein the π(j) is defined as follows:
• Order of deinterleaving
• π(j) (0 ≤ j < 45)
• Code
• j
• 0
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• Rate
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 5/15
• π(j)
• 35
• 7
• 29
• 11
• 14
• 32
• 38
• 28
• 20
• 17
• 25
• 39
• 5
• 13
• 34
• 37
• 23
• 15
• 36
• 18
• 42
• 16
• 33
• 31
• Order of deinterleaving
• π(j) (0 ≤ j < 45)
• Code
• j
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• Rate
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 5/15
• π(j)
• 19
• 4
• 1
• 12
• 10
• 30
• 0
• 44
• 43
• 2
• 21
• 27
• 22
• 3
• 6
• 40
• 24
• 41
• 9
• 26
• 8.