Bit interleaver for low-density parity check codeword having length of 16200 and code rate of 4/15 and 16-symbol mapping, and bit interleaving method using same

摘要

A bit interleaver, a bit-interleaved coded modulation (BICM) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (LDPC) codeword having a length of 16200 and a code rate of 4/15. The processor generates an interleaved codeword by interleaving the LDPC codeword on a bit group basis. The size of the bit group corresponds to a parallel factor of the LDPC codeword. The second memory provides the interleaved codeword to a modulator for 16-symbol mapping.

主权项

1. A bit group-unit interleaver, comprising: a first memory configured to store a low-density parity check (LDPC) codeword having a length of 16200 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; and a second memory configured to store the interleaved codeword corresponding to a modulator for 16-symbol mapping, wherein the interleaving is performed using the following equation using permutation order:
Yj=Xπ(j) 0≦j≦Ngroup where Xπ(j) is a π(j)th bit group (Xj is a 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, and
wherein the permutation order corresponds to an interleaving sequence represented by the following interleaving sequence: {34 3 19 35 25 2 17 36 26 38 0 40 27 10 7 43 21 28 15 6 1 37 18 30 32 33 29 22 12 13 5 23 44 14 4 31 20 39 42 11 9 16 41 8 24},and wherein a modulated signal output from the modulator corresponds to a transmission signal, the transmission signal being transmitted to a reception device.