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, wherein the signal frame includes preamble, wherein the preamble includes control information indicating whether a frequency interleaving is enabled or not;
a demodulator configured to demodulate the received broadcast signal by Orthogonal Frequency Division Multiplexing (OFDM) scheme;
a frequency deinterleaver configured to selectively perform frequency deinterleaving on data in the signal frame based on the control information;
a de-mapper configured to de-map Physical Layer Pipe (PLP) data in the signal frame;
a bit deinterleaver configured to bit-deinterleave the PLP data;
a Forward Error Correction (FEC) decoder configured to FEC-decode the PLP data; and
an output processor configured to output a data stream,
wherein when the control information has a first value, the frequency deinterleaver is enabled and when the control information has a second value, the frequency deinterleaver is disabled.
2. The reception apparatus of claim 1 , wherein the frequency deinterleaving is performed by using a different deinterleaving sequence for every symbol pair in the signal frame.
3. The reception apparatus of claim 2 , wherein the deinterleaving sequence is generated based on a main-sequence generated by a first generator and a symbol offset generated by a second generator.
4. The reception apparatus of claim 3 , wherein the main-sequence generated by the first generator is variable based on an FFT size.
5. The reception apparatus of claim 3 , wherein the second generator generates a new offset for the every symbol pair and the symbol pair comprises two consecutive symbols.
6. A method of receiving a broadcast signal, comprising:
receiving the broadcast signal including a signal frame, wherein the signal frame includes preamble, wherein the preamble includes control information indicating whether a frequency interleaving is enabled or not;
demodulating the received broadcast signal by Orthogonal Frequency Division Multiplexing (OFDM) scheme;
selectively performing frequency deinterleaving on data in the signal frame based on the control information;
de-mapping Physical Layer Pipe (PLP) data in the signal frame;
bit-deinterleaving the PLP data;
Forward Error Correction (FEC)-decoding the PLP data; and
outputting a data stream,
wherein when the control information has a first value, a frequency deinterleaver is enabled and when the control information has a second value, the frequency deinterleaver is disabled.
7. The method of claim 6 , wherein the frequency deinterleaving is performed by using a different deinterleaving sequence for every symbol pair in the signal frame.
8. The method of claim 7 , wherein the deinterleaving sequence is generated based on a main-sequence generated by a first generator and a symbol offset generated by a second generator.
9. The method of claim 8 , wherein the main-sequence generated by the first generator is variable based on an FFT size.
10. The method of claim 9 , wherein the second generator generates a new offset for the every symbol pair and the symbol pair comprises two consecutive symbols.