Apparatus and method for sending and receiving broadcast signals
Disclosed herein is a broadcast signal transmitter. A broadcast signal transmitter according to an embodiment of the present invention includes an input formatting module configured to perform baseband formatting and to output the data of at least one Physical Layer Pipe (PLP), a BICM module configured to perform error-correction processing on the PLP data, a framing and interleaving module configured to interleave the PLP data and to generate a signal frame, and a waveform generation module configured to insert a preamble into the signal frame and to generate a broadcast signal by performing OFDM modulation.
1. A broadcast signal transmitter, comprising:
an input formatter configured to process input data and to output at least one Physical Layer Pipe (PLP) data;
a Bit Interleaved and Coded Modulation (BICM) processor configured to perform error correction processing on the PLP data;
a framer configured to generate a signal frame comprising the PLP data; and
a waveform generator configured to generate a transmission signal comprising the signal frame,
wherein the signal frame of the transmission signal comprises a bootstrap, a preamble, and a data part,
wherein the bootstrap comprises preamble structure information about the preamble,
wherein the preamble comprises a plurality of preamble symbols,
wherein the plurality of preamble symbols carry Layer 1 (L1) signaling data for the signal frame,
wherein a first preamble symbol of the plurality of preamble symbols has a minimum number of carriers (NoC), and
wherein the first preamble symbol comprises NoC-related information indicating an NoC for at least one remaining preamble symbol of the plurality of preamble symbols.
2. The broadcast signal transmitter of claim 1 , wherein the preamble structure information indicates a modulation/coding mode, a Fast Fourier Transform (FFT) size, a Guard Interval (GI) length, and a pilot pattern of the preamble.
3. The broadcast signal transmitter of claim 1 , wherein:
the first preamble symbol comprises preamble_symbol_number information, and
the preamble_symbol_number information indicates a number of the plurality of preamble symbols other than the first preamble symbol.
4. The broadcast signal transmitter of claim 2 ,
wherein the waveform generator comprises a pilot inserter configured to insert pilots into the signal frame,
wherein the plurality of preamble symbols comprise preamble pilots, and
wherein, for the preamble pilots, a number of symbols forming one pilot sequence in a time direction (Dy) is 1, and a separation of pilots in a frequency direction (Dx) is indicated by the preamble structure information.
5. The broadcast signal transmitter of claim 2 , wherein:
the L1 signaling data comprises L1-basic data and L1-detail data, and
the modulation/coding mode indicates modulation/coding mode of the L1-basic data.
6. A method of transmitting a broadcast signal, the method comprising:
processing input data and outputting at least one Physical Layer Pipe (PLP) data;
performing error correction processing on the PLP data;
generating a signal frame comprising the PLP data; and
generating a transmission signal comprising the signal frame,
wherein the signal frame of the transmission signal comprises a bootstrap, a preamble, and a data part,
wherein the bootstrap comprises preamble structure information about the preamble,
wherein the preamble comprises a plurality of preamble symbols,
wherein a plurality of preamble symbols carry Layer 1 (L1) signaling data for the signal frame,
wherein a first preamble symbol of the plurality of preamble symbols has a minimum number of carriers (NoC), and
wherein the first preamble symbol comprises NoC-related information indicating an NoC for at least one remaining preamble symbol of the plurality of preamble symbols.
7. The method of claim 6 , wherein the preamble structure information indicates a modulation/coding mode, a Fast Fourier Transform (FFT) size, a Guard Interval (GI) length, and a pilot pattern of the preamble.
8. The method of claim 6 , wherein:
the first preamble symbol comprises preamble_symbol_number information, and
the preamble_symbol_number information indicates a number of the plurality of preamble symbols other than the first preamble symbol.
9. The method of claim 7 ,
wherein the generating of the transmission signal further comprises inserting pilots into the signal frame,
wherein the plurality of preamble symbols comprise preamble pilots, and
wherein, for the preamble pilots, a number of symbols forming one pilot sequence in a time direction (Dy) is 1, and a separation of pilots in a frequency direction (Dx) is indicated by the preamble structure information.
10. The method of claim 7 , wherein:
the L1 signaling data comprises L1-basic data and L1-detail data, and
the modulation/coding mode indicates modulation/coding mode of the L1-basic data.