Apparatus for transmitting and receiving a signal and method of transmitting and receiving a signal
The present invention relates to a method of transmitting and a method of receiving signals and corresponding apparatus. One aspect of the present invention relates to an efficient layer 1 (L1) processing method for a transmitter and a receiver using data slices.
1. A method of transmitting broadcasting data to a receiver, the method comprising:
LDPC (Low-density parity-check) encoding Layer 1 signaling data to generate LDPC parity bits;
performing puncturing on the generated LDPC parity bits;
interleaving the LDPC-encoded Layer 1 signaling data on which the puncturing was performed;
mapping the interleaved Layer 1 signaling data into Layer 1 signaling data symbols;
LDPC encoding PLP (Physical Layer Pipe) data of PLPs carrying one or more services;
interleaving the LDPC-encoded PLP data;
mapping the interleaved PLP data into PLP data symbols; and
transmitting a signal frame that includes a preamble including the Layer 1 signaling data symbols and one or more data units including the PLP data symbols,
wherein the PLP data symbols in the signal frame are located after the Layer 1 signaling data symbols for signaling the PLPs and the one or more data units,
wherein the Layer 1 signaling data include information for identifying a number of data units, information for identifying a data unit type, information for identifying a number of PLPs within a data unit, information for indicating a change of the Layer 1 signaling data and identification information for identifying a current PLP.
2. The method of claim 1 , further comprising:
frequency interleaving the Layer 1 signaling data symbols.
3. The method of claim 1 , further comprising:
time interleaving the PUP data symbols.
4. The method of claim 1 , wherein the Layer 1 signaling data further include indication information for indicating whether the PLP contains table information for acquiring one or more services.
5. A transmitter for transmitting broadcasting data to a receiver, the transmitter comprising:
a first encoder to LDPC encode Layer 1 signaling data to generate LDPC parity bits;
a puncture to perform puncturing on the generated LDPC parity bits;
a first interleaver to interleave the LDPC-encoded Layer 1 signaling data on which the puncturing was performed;
a first mapper to map the interleaved Layer 1 signaling data into Layer 1 signaling data symbols;
a second encoder to LDPC encode PLP (Physical Layer Pipe) data of PLPs carrying one or more services;
a second interleaver to interleave the LDPC-encoded PLP data;
a second mapper to map the interleaved PLP data into PLP data symbols; and
a transmission unit to transmit a signal frame that includes a preamble including the Layer 1 signaling data symbols and one or more data units including the PLP data symbols,
wherein the PLP data symbols in the signal frame are located after the Layer 1 signaling data symbols for signaling the PLPs and the one or more data units,
wherein the Layer 1 signaling data include information for identifying a number of data units, information for identifying a data unit type, information for identifying a number of PLPs within a data unit, information for indicating a change of the Layer 1 signaling data and identification information for identifying a current PLP.
6. The transmitter of claim 5 , further comprising:
a frequency interleaver to frequency interleave the Layer 1 signaling data symbols.
7. The transmitter of claim 5 , further comprising:
a time interleaver to time interleave the PLP data symbols.
8. The transmitter of claim 5 , wherein the Layer 1 signaling data further include indication information for indicating whether the PLP contains table information for acquiring one or more services.