Apparatus and method for sending and receiving broadcast signals
A broadcast signal receiver includes a tuner configured to receive a broadcast signal; a pilot detector configured to detect pilots included in the broadcast signal; a de-framer configured to de-frame a signal frame of the broadcast signal and to extract Physical Layer Pipe (PLP) data from the signal frame; and a decoder configured to decode the PLP data, wherein the signal frame comprises a bootstrap, a preamble, and the PLP data, wherein the bootstrap comprises first information for indicating system bandwidth, second information for emergency alert wake up, and third information for indicating structure of the preamble, wherein the preamble comprises a plurality of preamble symbols, the preamble carrying Layer 1 (L1) signaling data for the signal frame, and wherein the foremost preamble symbol comprises fourth information indicating a number of at least one remaining preamble symbol.
1. A broadcast signal receiver, comprising:
a tuner to receive a broadcast signal;
a pilot detector to detect pilots included in the broadcast signal;
a de-framer to de-frame a signal frame of the broadcast signal and to extract Physical Layer Pipe (PLP) data from the signal frame;
wherein the signal frame comprises a bootstrap, a preamble, and the PLP data,
the bootstrap comprises first information for indicating system bandwidth, second information for emergency alert wake up, and third information for indicating structure of the preamble,
the preamble comprises a plurality of preamble symbols, the preamble carrying Layer 1 (L1) signaling data for the signal frame,
wherein a foremost preamble symbol comprises fourth information for indicating a number of remaining preamble symbols,
the foremost preamble symbol uses a minimum number of carriers (NoC) and the foremost preamble symbol comprises fifth information related to NoC for the remaining preamble symbols;
a signaling decoder to decode the fourth information and the fifth information from the foremost preamble, and the de-framer to de-frame the signal frame based on the fourth information and the fifth information; and
a decoder to decode the PLP data.
2. The broadcast signal receiver of claim 1 ,
wherein the third information indicates a Fast Fourier Transform (FFT) size, a Guard Interval (GI) length, and a pilot pattern of the preamble.
3. The broadcast signal receiver of claim 2 ,
wherein the plurality of preamble symbols comprise preamble pilots, and
for the preamble pilots, a number of symbols forming one pilot sequence in a time direction (Dy) is 1, and a separation of pilots in a frequency direction (Dx) is indicated by the third information.
4. The broadcast signal receiver of claim 1 ,
wherein the signal frame includes at least one subframe and the at least one subframe comprises at least one subframe boundary symbol, and
the subframe boundary symbol is a first symbol or a last symbol of the subframe which has a greater scattered pilot density than data symbol.
5. The broadcast signal receiver of claim 4 ,
wherein when Fast Fourier Transform (FFT) sizes of the preamble and a subsequent subframe are different, a foremost symbol of the subsequent subframe is the subframe boundary symbol.
6. A method of processing a broadcast signal by an apparatus for receiving a broadcast signal, the method comprising:
receiving a broadcast signal;
detecting pilots included in the broadcast signal;
de-framing a signal frame of the broadcast signal and extracting Physical Layer Pipe (PLP) data from the signal frame;
the signal frame comprises a bootstrap, a preamble, and the PLP data,
the bootstrap comprises first information for indicating system bandwidth, second information for emergency alert wake up, and third information for indicating structure of the preamble,
the preamble comprises a plurality of preamble symbols, the preamble carrying Layer 1 (L1) signaling data for the signal frame,
a foremost preamble symbol comprises fourth information for indicating a number of remaining preamble symbols,
the foremost preamble symbol uses a minimum number of carriers (NoC) and the foremost preamble symbol comprises fifth information related to NoC for the remaining preamble symbols;
decoding the fourth information and the fifth information from the foremost preamble, and the de-framing comprises de-framing the signal frame based on the fourth information and the fifth information; and
decoding the PLP data.
7. The method of claim 6 , wherein the third information indicates a Fast Fourier Transform (FFT) size, a Guard Interval (GI) length, and a pilot pattern of the preamble.
8. The method of claim 7 ,
wherein the plurality of preamble symbols comprise preamble pilots, and
for the preamble pilots, a number of symbols forming one pilot sequence in a time direction (Dy) is 1, and a separation of pilots in a frequency direction (Dx) is indicated by the third information.
9. The method of claim 6 ,
wherein the signal frame includes at least one subframe and the at least one subframe comprises at least one subframe boundary symbol, and
the subframe boundary symbol is a first symbol or a last symbol of the subframe which has a greater scattered pilot density than data symbol.
10. The method of claim 9 ,
wherein when Fast Fourier Transform (FFT) sizes of the preamble and a subsequent subframe are different, a foremost symbol of the subsequent subframe is the subframe boundary symbol.