BROADCAST SIGNAL TRANSMITTER AND RECEIVER, AND METHODS FOR TRANSMITTING AND RECEIVING BROADCAST SIGNALS

摘要

A broadcast signal transmitter according to one embodiment of the present invention comprises: an FEC encoder for FEC encoding data that is included in a signal; a demultiplexer for reordering a bit order of the FEC encoded data; a divider for reordering the reordered data according to the QAM type of a first input signal and a second input signal and then outputting the first input signal and the second input signal; a symbol mapper for symbol mapping the first input signal and the second input signal, respectively; a MIMO encoder for MIMO processing the first input signal and the second input signal to output a first transmission signal and a second transmission signal; and a first OFDM generator and a second OFDM generator for performing the OFDM modulation on the first transmission signal and the second transmission signal, respectively, wherein the MIMO processing involves the application of a MIMO matrix to the first input signal and the second input signal, the MIMO matrix uses a parameter 'a' to adjust the power of the first input signal and the second input signal, the parameter 'a' varies depending on the modulation type of the first input signal and the second input signal, and the parameter 'a' of the MIMO matrix is set in such a manner as to adjust the power of the first input signal and the second input signal for the first transmission signal or the second transmission signal.