Broadcast signal transmission apparatus, broadcast signal reception apparatus, broadcast signal transmission method, and broadcast signal reception method
A method of transmitting a broadcast signal includes encoding data which is carried by Data Pipes (DPS); mapping the encoded data to constellations; interleaving the mapped data by skipping virtual cells based on a memory address for the interleaving; building at least one signal frame having symbols including the interleaved data; frequency interleaving cells of the symbols in the at least one signal frame; modulating the at least one signal frame including the frequency interleaved cells of the symbols by an orthogonal frequency division multiplexing (OFDM) scheme; and transmitting the broadcast signal including the modulated at least one signal frame.
1. A method of transmitting a broadcast signal by an apparatus for transmitting the broadcast signal, the method comprising:
encoding data to generate one or more Forward Error Correction (FEC) blocks, wherein each FEC block is comprised of cells;
writing the one or more FEC blocks of the encoded data into a memory, wherein the cells of each FEC block are written into the memory based on a memory index;
reading the one or more FEC blocks based on the memory index, wherein when the memory index corresponds to a virtual memory index, the virtual memory index is skipped during the reading of the one or more FEC blocks;
building at least one signal frame including the read one or more FEC blocks;
frequency interleaving an OFDM symbol in the at least one signal frame;
modulating the at least one signal frame including the frequency interleaved OFDM symbol by an Orthogonal Frequency Division Multiplexing (OFDM) scheme; and
transmitting the broadcast signal including the modulated at least one signal frame.
2. The method of claim 1 ,
wherein the one or more FEC blocks are linearly written into the memory.
3. A method of receiving a broadcast signal by an apparatus for receiving the broadcast signal, the method comprising:
receiving the broadcast signal;
demodulating the broadcast signal by an Orthogonal Frequency Division Multiplexing (OFDM) scheme;
frequency deinterleaving the demodulated broadcast signal;
writing one or more Forward Error Correction (FEC) blocks in the frequency deinterleaved broadcast signal into a memory, wherein cells of the one or more FEC blocks are written into the memory based on a memory index;
reading the one or more FEC blocks based on the memory index, wherein if a memory value corresponding to the memory index of a cell is an identifiable value, then performing a skip operation for ignoring the memory value during the reading of the one or more FEC blocks; and
decoding the read one or more FEC blocks.
4. The method of claim 3 ,
wherein the one or more FEC blocks are linearly read from the memory.
5. A broadcast signal transmission apparatus comprising:
a Forward Error Correction (FEC) encoder configured to encode data to generate one or more FEC blocks, wherein each FEC block is comprised of cells;
an interleaver configured to write the one or more FEC blocks of the encoded data into a memory, wherein the cells of each FEC block are written into the memory based on a memory index, and
read the one or more FEC blocks based on the memory index, wherein when the memory index corresponds to a virtual memory index, the virtual memory index is skipped during the reading of the one or more FEC blocks;
a frame builder configured to build at least one signal frame including the read one or more FEC blocks;
a frequency interleaver configured to interleave an OFDM symbol in the at least one signal frame;
a modulator configured to modulate the at least one signal frame including the frequency interleaved OFDM symbol by an Orthogonal Frequency Division Multiplexing (OFDM) scheme; and
a transmitter configured to transmit the broadcast signal including the modulated at least one signal frame.
6. The apparatus of claim 5 ,
wherein the one or more FEC blocks are linearly written into the memory.
7. An apparatus of receiving a broadcast signal, the apparatus comprising:
a receiver configured to receive a broadcast signal;
a demodulator configured to demodulate the broadcast signal by an Orthogonal Frequency Division Multiplexing (OFDM) scheme;
a frequency deinterleaver configured to deinterleave the demodulated broadcast signal;
a deinterleaver configured to write one or more Forward Error Correction (FEC) blocks in the frequency deinterleaved broadcast signal into a memory, wherein cells of the one or more FEC blocks are written into the memory based on a memory index, and
read the one or more FEC blocks based on the memory index, wherein if a memory value corresponding to the memory index of a cell is an identifiable value, then performing a skip operation for ignoring the memory value during the reading of the one or more FEC blocks; and
a decoder to decode the read one or more FEC blocks.
8. The apparatus of claim 7 ,
wherein the one or more FEC blocks are linearly read from the memory.