Broadcast signal transmitter/receiver and broadcast signal transmitting/receiving method
A method for transmitting broadcast signals in a transmitter includes encoding data for Physical Layer Pipes (PLPs), mapping the encoded data onto constellations according to modulation types, multi-input multi-output (MIMO) processing the mapped data for the MIMO processing by multiplying a rotation matrix with a pair of symbols of the mapped data and applying a phase rotation matrix to the multiplied symbols, time interleaving the MIMO processed data, building frames by mapping the time interleaved data, frequency-interleaving data in the built frames, modulating the frequency-interleaved data by an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and transmitting the broadcast signals including the modulated data. The frames includes signaling information for signaling data in the frames. The signaling information includes information on a PLP identifier.
1. A method for transmitting broadcast signals in a transmitter, the method comprising:
encoding data for Physical Layer Pipes (PLPs);
mapping the encoded data onto constellations according to modulation types;
Multi-Input Multi-Output (MIMO) processing the mapped data for the MIMO processing by multiplying a rotation matrix with a pair of symbols of the mapped data and applying a phase rotation matrix to the multiplied symbols;
time interleaving the MIMO processed data;
building frames by mapping the time interleaved data;
frequency-interleaving data in the built frames;
modulating the frequency-interleaved data by an Orthogonal Frequency Division Multiplexing (OFDM) scheme; and
transmitting the broadcast signals including the modulated data,
wherein the frames include signaling information for signaling data in the frames,
wherein the signaling information includes information on a PLP identifier,
wherein the rotation matrix is represented as:
[
cos
θ
sin
θ
sin
θ
-
cos
θ
]
wherein “θ” is a rotation angle and the rotation angle depends on one of the modulation types.
2. A method for receiving broadcast signals in a transmitter, the method comprising:
receiving the broadcast signals;
demodulating the received broadcast signals by an Orthogonal Frequency Division Multiplexing (OFDM) scheme,
frequency de-interleaving the demodulated broadcast signals;
parsing frames from the frequency de-interleaved broadcast signals;
time de-interleaving symbols in the parsed frames;
Multi-Input Multi Output (MIMO) decoding the time de-interleaved symbols using a rotation matrix and a phase rotation matrix with a pair of symbols;
demapping the MIMO decoded symbols into data for Physical Layer Pipes (PLPs);
decoding the data for the PLPs, wherein the frames include signaling information for signaling data in the frames, wherein the signaling information includes information on a PLP identifier, wherein the rotation matrix is represented as:
[
cos
θ
sin
θ
sin
θ
-
cos
θ
]
wherein “θ” is a rotation angle and the rotation angle depends on one of modulation types.