×

Bit interleaver for low-density parity check codeword having length of 64800 and code rate of 4/15 and 1024-symbol mapping, and bit interleaving method using same

  • US 10,447,305 B2
  • Filed: 03/20/2015
  • Issued: 10/15/2019
  • Est. Priority Date: 02/16/2015
  • Status: Active Grant
First Claim
Patent Images

1. A broadcast transmission device, comprising:

  • a first memory configured to store a low-density parity check (LDPC) codeword having a length of 64800 and a code rate of 4/15;

    a processor 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 second memory configured to output the interleaved codeword;

    a modulator configured to perform 1024-symbol mapping corresponding to the interleaved codeword to generate 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, the broadcasted transmission signal being an electromagnetic signal having a radio frequency,wherein the LDPC codeword is generated by performing accumulation at parity bit addresses which are updated using a predetermined sequence,wherein the interleaving is performed using the following equation using a permutation order;


    Yj=Xπ

    (j)
    0≤

    j<

    N
    group where Xπ

    (j)
    is a π

    (j)th bit group, Yj is an interleaved j-th bit group, Ngroup is the number of bit groups, and π

    (j) is a permutation order for bit group-based interleaving,wherein the permutation order corresponds to an interleaving sequence, the interleaving sequence being for the LDPC codeword having the length of 64800 and the code rate of 4/15 and being represented by the following equation;


    interleaving sequence={114 133 4 73 8 139 7 5 177 88 66 11 24 74 49 45 167 81 117 137 46 22 165 51 68 110 6 1 16 132 130 143 169 2 20 140 94 21 91 126 172 27 162 34 113 142 166 115 106 160 84 136 175 0 26 151 69 174 59 159 161 170 52 164 80 108 3 23 101 33 125 111 63 124 98 40 145 9 39 155 149 147 67 76 48 120 119 53 54 138 179 156 127 13 152 129 123 141 109 89 121 50 10 37 104 144 86 178 96 148 128 56 64 153 95 12 105 41 154 99 25 171 92 17 134 19 61 32 85 102 14 71 146 163 173 118 57 18 36 42 78 31 97 55 58 116 90 168 43 72 15 112 93 60 38 103 87 158 35 29 176 150 77 79 122 47 28 135 100 83 65 131 75 157 62 70 44 30 107 82}, andwherein the interleaved codeword is interleaved by the interleaving sequence on the bit group basis before performing the 1024-symbol mapping so as to distribute burst errors occurring in the transmission signal when the transmission signal is transmitted over the physical channel.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×