Broadcast signal frame generation device and broadcast signal frame generation method using bootstrap including symbol for signaling BICM mode of preamble and OFDM parameter together
An apparatus and method for broadcast signal frame using a bootstrap including a symbol for signaling a BICM mode and OFDM parameters of a preamble, together are disclosed. An apparatus for generating broadcast signal frame according to an embodiment of the present invention includes a time interleaver configured to generate a time-interleaved signal by performing interleaving on a BICM output signal; and a frame builder configured to generate a broadcast signal frame including a bootstrap and a preamble using the time-interleaved signal. In this case, the bootstrap includes a symbol for signaling a BICM mode and OFDM parameters of L1-Basic of the preamble, together.
1. A method of generating broad signal frame, comprising:
generating a time-interleaved signal by performing interleaving on a BICM output signal; and
generating a broadcast signal frame including a bootstrap and a preamble using the time-interleaved signal,
wherein the bootstrap includes a symbol for signaling a signaling protection mode of L1-Basic of the preamble and OFDM parameters of L1-Basic, together.
2. The method of claim 1 , wherein the symbol corresponds to a fixed-length bit string signaling the signaling protection mode along with the OFDM parameters.
3. The method of claim 2 , wherein the fixed-length bit string is a bit string capable of identifying 256 combinations.
4. The method of claim 3 , wherein the OFDM parameters correspond to a combination of a FFT size, a guard interval length and a pilot pattern.
5. The method of claim 4 , wherein the signaling protection mode includes
a first mode, a second mode and a third mode for identifying QPSK and a code rate of 3/15,
a fourth mode for identifying 16-NUC (Non Uniform Constellation) and a code rate of 3/15, and
a fifth mode for identifying 64-NUC (Non Uniform Constellation) and a code rate of 3/15.
6. The method of claim 5 , wherein the OFDM parameters correspond to the combination among 32 combinations of FFT sizes, guard interval lengths, and pilot patterns.
7. The method of claim 6 , wherein the first mode corresponds to a mode in which the parity repetition is performed, and the second and third modes correspond to a mode in which the parity repetition is not performed.
8. The method of claim 7 , wherein the parity puncturing size of the second mode is larger than the parity puncturing size of the first mode and is smaller than the parity puncturing size of the third mode.
9. The method of claim 8 , wherein the symbol corresponds to a lookup table in which
a preamble structure corresponding to a second guard interval length is allocated prior to a preamble structure corresponding to a first guard interval length, the second guard interval length being shorter than the first guard interval length when the FFT sizes corresponding to the OFDM parameters are the same.
10. The method of claim 9 , wherein the symbol corresponds to the lookup table in which
the first mode, the second mode, the third mode, the fourth mode and the fifth mode are allocated in an order of robustness for the same combination of a FFT size, a guard interval length and a pilot pattern.