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Bit interleaver for low-density parity check codeword having length of 16200 and code rate of 10/15 and 256-symbol mapping, and bit interleaving method using same

  • US 10,360,102 B2
  • Filed: 05/21/2015
  • Issued: 07/23/2019
  • Est. Priority Date: 05/22/2014
  • Status: Active Grant
First Claim
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1. An apparatus for transmitting a broadcast signal, the apparatus comprising:

  • a first memory configured to store a low-density parity check (LDPC) codeword having a length of 16200 and a code rate of 10/15;

    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 256-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 broadcasting channel to a reception device,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 obtained by dividing the LDPC codeword into the 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 16200 and the code rate of 10/15 and being represented by the following interleaving sequence;


    {28 20 18 38 39 2 3 30 19 4 14 36 7 0 25 17 10 6 33 15 8 26 42 24 11 21 23 5 40 41 29 32 37 44 43 31 35 34 22 1 16 27 9 13 12}, andwherein the interleaved codeword is interleaved by the interleaving sequence on the bit group basis before performing the 256-symbol mapping so as to distribute burst errors occurring in the transmission signal when the transmission signal is transmitted over the broadcasting channel.

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