Broadcast signal transmitting apparatus, broadcast signal receiving apparatus, broadcast signal transmitting method, and broadcast signal receiving method
Disclosed herein is a method of receiving a broadcast signal. The method comprises receiving the broadcast signal; an Orthogonal Frequency Division Multiplexing (OFDM) demodulating on the received broadcast signal; parsing at least one signal frame from the demodulated broadcast signal to extract service data or service component data; converting the service data or service component data into bits; decoding the converted bits; and outputting a data stream comprising the decoded bits.
1. A reception apparatus for receiving a broadcast signal, comprising:
a receiver configured to receive the broadcast signal including a signal frame;
a demodulator configured to demodulate the received broadcast signal by Orthogonal Frequency Division Multiplexing (OFDM) scheme,
the signal frame including a preamble and a sub-frame,
the preamble including frequency interleaver information representing whether a frequency interleaver is applied to the sub-frame;
in response to the frequency interleaver information having a first value, a frequency deinterleaver is used to perform frequency deinterleaving on data for the sub-frame based on an deinterleaving sequence,
reset operation of the frequency deinterleaver is performed per the sub-frame, and
in response to the frequency interleaver information having a second value, the frequency deinterleaver is not used to perform the frequency deinterleaving on the data for the sub-frame,
a de-framer configured to deframe the signal frame including the data on which the frequency deinterleaving is performed or not performed and output Physical Layer Pipe (PLP) data;
a time deinterleaver configured to perform time deinterleaving on the outputted PLP data; and
a Forward Error Correction (FEC) decoder configured to FEC decode the PLP data on which the time deinterleaving is performed.
2. The reception apparatus of claim 1 ,
wherein the deinterleaving sequence is used for every symbol pair comprised of two consecutive symbols, and
wherein the deinterleaving sequence is generated based on a main-sequence and a symbol offset.
3. The reception apparatus of claim 2 ,
wherein an address check operation is performed to validate an address of the generated deinterleaving sequence.
4. The reception apparatus of claim 2 ,
wherein the main-sequence is variable based on an FFT size.
5. The reception apparatus of claim 2 ,
wherein the symbol offset is generated for the every symbol pair comprised of the two consecutive symbols.
6. A method of receiving a broadcast signal, comprising:
receiving the broadcast signal including a signal frame;
demodulating the received broadcast signal by Orthogonal Frequency Division Multiplexing (OFDM) scheme,
the signal frame including a preamble and a sub-frame,
the preamble including frequency interleaver information representing whether a frequency interleaver is applied to the sub-frame;
in response to the frequency interleaver information having a first value, performing frequency deinterleaving on data for the sub-frame based on an deinterleaving sequence,
reset operation of the frequency deinterleaving is performed per the sub-frame, and
in response to the frequency interleaver information having a second value, not performing the frequency deinterleaving on the data for the sub-frame;
deframing the signal frame including the data on which the frequency deinterleaving is performed or not performed and output Physical Layer Pipe (PLP) data;
performing time deinterleaving on the outputted PLP data; and
Forward Error Correction (FEC) decoding the PLP data on which the time deinterleaving is performed.
7. The method of claim 6 ,
wherein the deinterleaving sequence is used for every symbol pair comprised of two consecutive symbols, and
wherein the deinterleaving sequence is generated based on a main-sequence and a symbol offset.
8. The method of claim 7 ,
wherein an address check operation is performed to validate an address of the generated deinterleaving sequence.
9. The method of claim 7 ,
wherein the main-sequence is variable based on an FFT size.
10. The method of claim 7 ,
wherein the symbol offset is generated for the every symbol pair comprised of the two consecutive symbols.