Broadcast signal transmitting apparatus, broadcast signal receiving apparatus, and broadcast signal transceiving method in a broadcast signal transceiving apparatus
Disclosed is a broadcast signal transmitting apparatus, a broadcast signal receiving apparatus, and a broadcast signal transceiving method in a broadcast signal transceiving apparatus. The broadcast signal transmitting method comprises the following steps: compressing the headers of data packets of an IP stream identified by IP address information, wherein the compressed data packets include a first packet, the header of which contains static field information, a second packet, the header of which contains dynamic field information, and a third packet, the header of which contains the compressed static field information and/or the compressed dynamic field information; signaling IP-PLP mapping information for mapping the IP stream and a component PLP for transmitting the IP stream, the IP stream compression information, and the header information of the first packet to L2 signaling information; and transmitting the header information of the second and third packets via the component PLP, and transmitting the L2 signaling information via a common PLP.
1. A method of processing broadcast data in a transmitter, the method comprising:
Forward Error Correction (FEC) encoding Physical Layer Pipe (PLP) data of a PLP; interleaving the FEC-encoded PLP data;
FEC encoding signaling data for signaling the PLP;
mapping the FEC-encoded signaling data and the interleaved PLP data into a frame; modulating data in the frame by an Orthogonal Frequency Division Multiplexing (OFDM) scheme; and
transmitting a broadcast signal including the modulated data in the frame, wherein the signaling data comprises first signaling data and second signaling data, wherein the first signaling data includes size information of the second signaling data, and wherein the second signaling data includes encoding information of the PLP, and
wherein a plurality of preamble symbols are located at the beginning of the broadcast signal in a time domain.
2. The method of claim 1 , wherein the preamble symbols includes a first preamble symbol and a second preamble symbol, and wherein a postfix of the first symbol and a prefix of the second symbol are concatenated with each other in the time domain.
3. The method of claim 2 , wherein the postfix of the first symbol carries a frequency shifted part of the first symbol and the prefix of the second symbol carries a frequency shifted part of the second symbol.
4. The method of claim 3 , wherein the postfix of the first symbol and the prefix of the second symbol are frequency shifted with the same frequency shift value.
5. The method of claim 4 , wherein the postfix of the first symbol and the prefix of the second symbol are frequency shifted with opposite signs, respectively.
6. A transmitter for processing broadcast data, the transmitter comprising:
a first encoder for FEC encoding PLP data of a PLP;
an interleaver for interleaving the FEC-encoded PLP data;
a second encoder for FEC encoding signaling data for signaling the PLP;
a frame builder for mapping the FEC-encoded signaling data and the interleaved PLP data into a frame; and
a modulator for modulating data in the frame by an OFDM scheme; and
a transmitter for transmitting a broadcast signal including the modulated data in the frame, wherein the signaling data comprises first signaling data and second signaling data, wherein the first signaling data includes size information of the second signaling data, and wherein the second signaling data includes encoding information of the PLP and wherein a plurality of preamble symbols are located at the beginning of the broadcast signal in a time domain.
7. The transmitter of claim 6 , wherein the preamble symbols includes a first preamble symbol and a second preamble symbol, and
wherein a postfix of the first symbol and a prefix of the second symbol are concatenated with each other in the time domain.
8. The transmitter of claim 7 , wherein the postfix of the first symbol carries a frequency shifted part of the first symbol and the prefix of the second symbol carries a frequency shifted part of the second symbol.
9. The transmitter of claim 8 , wherein the postfix of the first symbol and the prefix of the second symbol are frequency shifted with opposite signs, respectively.
10. The transmitter of claim 9 , wherein the postfix of the first symbol and the prefix of the second symbol are frequency shifted with opposite signs, respectively.