Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals
An apparatus includes an encoder to encode service data corresponding to each of a plurality of Physical Layer Pipes, an encoder to encode signaling data by performing LDPC (Low Density Parity Check) encoding the signaling data by adding parity bits, block interleaving the LDPC encoded signaling data, and demultiplexing the block interleaved signaling data using shifting method. The shifting method is performed based on the modulation order and indices of bits. A frame builder builds at least one signal frame including the encoded service data, the encoded signaling data, a modulator modulates the at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme, and a transmitter transmits the broadcast signals carrying the at least one modulated signal frame.
1. A method for transmitting broadcast signals, the method comprising:
encoding service data corresponding to each of a plurality of Physical Layer Pipes;
encoding signaling data including:
LDPC (Low Density Parity Check) encoding the signaling data by adding parity bits;
block interleaving the LDPC encoded signaling data; and
demultiplexing the block interleaved signaling data using shifting method, wherein the shifting method is performed based on a modulation order and indices of bits;
building at least one signal frame including the encoded service data and the encoded signaling data;
modulating the at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme; and
transmitting the broadcast signals carrying the at least one modulated signal frame.
2. The method of claim 1 , the encoding the signaling data including:
interleaving the added parity bits;
and
mapping the multiplexed signaling data to constellation symbols.
3. The method of claim 1 , the block interleaving the LDPC encoded signaling data is performed according to the modulation order.
4. The method of claim 1 , the modulation order is one of QPSK (quadrature phase shift keying), 16-NUC (non-uniform constellation), 64-NUC, 256-NUC and 1024-NUC.
5. The method of claim 2 , wherein the method includes puncturing the interleaved parity bits.
6. An apparatus for transmitting broadcast signals, the apparatus comprising:
an encoder to encode service data corresponding to each of a plurality of Physical Layer Pipes;
an encoder to encode signaling data by performing:
LDPC (Low Density Parity Check) encoding the signaling data by adding parity bits;
block interleaving the LDPC encoded signaling data; and
demultiplexing the block interleaved signaling data using shifting method, wherein the shifting method is performed based on a modulation order and indices of bits;
a frame builder to build at least one signal frame including the encoded service data and the encoded signaling data;
a modulator to modulate the at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme; and
a transmitter to transmit the broadcast signals carrying the at least one modulated signal frame.
7. The apparatus of claim 6 , the encoder to encode the signaling data including:
an interleaver to interleave the added parity bits; and
a mapper to map the demultiplexed signaling data to constellation symbols.
8. The apparatus of claim 6 , the block interleaver is performed according to the modulation order.
9. The apparatus of claim 6 , the modulation order is one of QPSK (quadrature phase shift keying), 16-NUC (non-uniform constellation), 64-NUC, 256-NUC and 1024-NUC.
10. The apparatus of claim 7 , wherein the apparatus includes puncturing block to puncture the interleaved parity bits.