| CPC H03M 13/2757 (2013.01) [H03M 13/1102 (2013.01); H03M 13/116 (2013.01); H03M 13/1185 (2013.01); H03M 13/255 (2013.01); H03M 13/2778 (2013.01); H03M 13/2792 (2013.01); H03M 13/616 (2013.01); H03M 13/6552 (2013.01); H04L 1/0041 (2013.01); H04L 1/0057 (2013.01); H04L 1/0058 (2013.01); H04L 1/0071 (2013.01); H04L 27/20 (2013.01); H04L 27/3416 (2013.01)] | 3 Claims |
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1. A Bit-Interleaved Coded Modulation (BICM) device, comprising:
an error-correction coder configured to output a low-density parity check (LDPC) codeword having a length of 64800 and a code rale of 7/15;
a hit interleaver configured to generate an interleaved codeword by interleaving the LDPC codeword on a bit group basis, the size of the bit group corresponding to a parallel factor of the LDPC codeword;
a modulator configured to perform quadrature phase shift keying (QPSK) modulation for generating a modulated signal; and
an antenna configured to broadcast a transmission signal corresponding to the modulated signal over a physical channel to a reception device,
wherein the interleaving is performed using the following equation using permutation order:
Yj=Xπ(j)0≤j<Ngroup
where Xj is the j-th bit group, Yj is an interleaved j-th bit group, and
 (j) is a permutation order for bit group-based interleaving,wherein the permutation order corresponds to an interleaving sequence represented by the following interleaving sequence
={152 172 113 167 100 163 159 144 114 47 161 125 99 89 179 123 149 177 1 132 37 26 16 57 166 81 133 112 33 151 117 83 52 178 85 124 143 28 59 130 31 157 170 44 61 102 155 111 153 55 54 176 17 68 169 20 104 38 147 7 174 6 90 15 56 120 13 34 48 122 110 154 76 64 75 84 162 77 103 156 128 150 87 27 42 3 23 96 171 145 91 24 78 5 69 175 8 29 106 137 131 43 93 160 108 1 64 12 140 71 63 141 109 129 82 80 173 105 9 66 65 92 32 41 72 74 4 36 94 67 158 10 88 142 45 126 2 86 118 73 79 121 148 95 70 51 53 21 115 135 25 168 11 136 18 138 134 119 146 0 97 22 165 40 19 60 46 14 49 139 58 101 39 116 127 30 98 50 107 35 62}, and
wherein the interleaving is performed corresponding to the interleaving sequence before performing the quadrature phase shift keying (QPSK) modulation so as to distribute burst errors occurring in the transmission signal transmitted over the physical channel,
wherein the LDPC codeword is encoded using a sequence corresponding to a parity check matrix (PCM),
wherein the sequence is represented by the following Sequence Table:
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