Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals

Abstract

A method and device for processing broadcast signals are discussed. The method includes receiving the broadcast signals carrying service data, demodulating the broadcast signals by an Orthogonal Frequency Division Multiplexing (OFDM) scheme, MIMO processing data in the broadcast signals based on a rotation value, where the rotation value has zero (0) degree for a modulation order corresponding to equal to or greater than 64 Quadrature Amplitude Modulation (QAM) and a code rate corresponding to at least one of 2/15, 3/15, 4/15, 5/15, 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 or 13/15, and the rotation value has zero (0) degree for a modulation order corresponding to Quadrature Phase Shift Keying (QPSK) and a code rate corresponding to at least one of 2/15, 3/15, 4/15 or 5/15, and decoding the data.

What is claimed is: 
     
       1. A method for processing broadcast signals, the method comprising:
 receiving the broadcast signals carrying service data; 
 demodulating the broadcast signals by an Orthogonal Frequency Division Multiplexing (OFDM) scheme; 
 Multiple Input Multiple Output (MIMO) processing data in the broadcast signals based on a rotation value, 
 the rotation value has zero (0) degree for a modulation order corresponding to equal to or greater than 64 Quadrature Amplitude Modulation (QAM) and a code rate corresponding to at least one of 2/15, 3/15, 4/15, 5/15, 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 or 13/15, 
 the rotation value has zero (0) degree for a modulation order corresponding to Quadrature Phase Shift Keying (QPSK) and a code rate corresponding to at least one of 2/15, 3/15, 4/15 or 5/15, 
 the rotation value has non-zero degree for a modulation order corresponding to Quadrature Phase Shift Keying (QPSK) and a code rate corresponding to at least one of 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 or 13/15; and 
 decoding the data. 
 
     
     
       2. The method of  claim 1 ,
 wherein the data in the MIMO processing is rotated based on a matrix having the rotation value. 
 
     
     
       3. A device for processing broadcast signals, the device comprising:
 a tuner configured to receive the broadcast signals carrying service data; 
 a demodulator configured to demodulate the broadcast signals by an Orthogonal Frequency Division Multiplexing (OFDM) scheme; 
 a Multiple Input Multiple Output (MIMO) processor configured to MIMO process data in the broadcast signals based on a rotation value, 
 the rotation value has zero (0) degree for a modulation order corresponding to equal to or greater than 64 Quadrature Amplitude Modulation (QAM) and a code rate corresponding to at least one of 2/15, 3/15, 4/15, 5/15, 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 or 13/15, 
 the rotation value has zero (0) degree for a modulation order corresponding to Quadrature Phase Shift Keying (QPSK) and a code rate corresponding to at least one of 2/15, 3/15, 4/15 or 5/15, 
 the rotation value has non-zero degree for a modulation order corresponding to Quadrature Phase Shift Keying (QPSK) and a code rate corresponding to at least one of 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 or 13/15; and 
 a decoder configured to decode the data. 
 
     
     
       4. The device of  claim 3 , wherein the data, by the MIMO processor, is rotated based on a matrix having the rotation value. 
     
     
       5. A method for transmitting broadcast signals, the method comprising:
 encoding data; 
 Multiple Input Multiple Output (MIMO) processing the data based on a rotation value, 
 the rotation value has zero (0) degree for a modulation order corresponding to equal to or greater than 64 Quadrature Amplitude Modulation (QAM) and a code rate corresponding to at least one of 2/15, 3/15, 4/15, 5/15, 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 or 13/15, 
 the rotation value has zero (0) degree for a modulation order corresponding to Quadrature Phase Shift Keying (QPSK) and a code rate corresponding to at least one of 2/15, 3/15, 4/15 or 5/15, 
 the rotation value has non-zero degree for a modulation order corresponding to Quadrature Phase Shift Keying (QPSK) and a code rate corresponding to at least one of 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 or 13/15; 
 modulating broadcast signals including the data by an Orthogonal Frequency Division Multiplexing (OFDM) scheme; and 
 transmitting the broadcast signals. 
 
     
     
       6. An apparatus for transmitting broadcast signals, the apparatus comprising:
 an encoder configured to encode data; 
 a Multiple Input Multiple Output (MIMO) processor configured to MIMO process the data based on a rotation value, 
 the rotation value has zero (0) degree for a modulation order corresponding to equal to or greater than 64 Quadrature Amplitude Modulation (QAM) and a code rate corresponding to at least one of 2/15, 3/15, 4/15, 5/15, 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 or 13/15, 
 the rotation value has zero (0) degree for a modulation order corresponding to Quadrature Phase Shift Keying (QPSK) and a code rate corresponding to at least one of 2/15, 3/15, 4/15 or 5/15, 
 the rotation value has non-zero degree for a modulation order corresponding to Quadrature Phase Shift Keying (QPSK) and a code rate corresponding to at least one of 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 or 13/15; 
 a modulator configured to modulate broadcast signals including the data by an Orthogonal Frequency Division Multiplexing (OFDM) scheme; and 
 a transmitter configured to transmit the broadcast signals. 
 
     
     
       7. An apparatus for receiving broadcast signals, the apparatus comprising:
 a receiver to receive the broadcast signals carrying service data that are processed by a Multiple-Input Multiple-Output (MIMO) operation;   a demodulator to demodulate the broadcast signals by an Orthogonal Frequency Division Multiplexing (OFDM) scheme,   wherein the MIMO operation is based on rotation matrices,   wherein values of rotation angles of the rotation matrices depend on modulation orders and code rates of the service data;   a demapper to demap data in the broadcast signals; and   a decoder to decode the data based on the code rates,   wherein when a modulation order is Quadrature Phase Shift Keying (QPSK) and the code rates are 2/15, 3/15, 4/15, and 5/15, the values of the rotation angles are zero (0) degrees,   wherein when a modulation order is QPSK and the code rates are 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 and 13/15, the values of the rotation angles are non-zero (0) degrees.   
     
     
       8. The apparatus of  claim 7 ,
 wherein when a modulation order is a Non-Uniform-Constellation (NUC) 64 and the code rates are 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 and 13/15, the values of the rotation angles are non-zero (0) degrees,   wherein when a modulation order is a NUC-256 and the code rates are 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 and 13/15, the values of the rotation angles are non-zero (0) degrees,   wherein when a modulation order is a NUC-1024 and the code rates are 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 and 13/15, the values of the rotation angles are non-zero (0) degrees.   
     
     
       9. A method for receiving broadcast signals, the method comprising:
 receiving the broadcast signals carrying service data that are processed by a Multiple-Input Multiple-Output (MIMO) operation;   demodulating the broadcast signals by an Orthogonal Frequency Division Multiplexing (OFDM) scheme,   wherein the MIMO operation is based on rotation matrices,   wherein values of rotation angles of the rotation matrices depend on modulation orders and code rates of the service data;   demapping data in the broadcast signals; and   decoding the data based on the code rates,   wherein when a modulation order is Quadrature Phase Shift Keying (QPSK) and the code rates are 2/15, 3/15, 4/15, and 5/15, the values of the rotation angles are zero (0) degrees,   wherein when a modulation order is QPSK and the code rates are 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 and 13/15, the values of the rotation angles are non-zero (0) degrees.   
     
     
       10. The method of  claim 9 ,
 wherein when a modulation order is a Non-Uniform-Constellation (NUC) 64 and the code rates are 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 and 13/15, the values of the rotation angles are non-zero (0) degrees,   wherein when a modulation order is a NUC-256 and the code rates are 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 and 13/15, the values of the rotation angles are non-zero (0) degrees,   wherein when a modulation order is a NUC-1024 and the code rates are 6/15, 7/15, 8/15, 9/15, 10/15, 11/15, 12/15 and 13/15, the values of the rotation angles are non-zero (0) degrees.