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

An apparatus for receiving broadcast signals, the apparatus comprising:

• a receiver to receive the broadcast signals;
• a demodulator to demodulate the received broadcast signals by an Orthogonal Frequency Division Multiplex (OFDM) scheme;
• a frame parser to parse a signal frame from the demodulated broadcast signals;
• a bit deinterleaver to bit deinterleave data in the parsed signal frame,
• wherein the bit deinterleaver includes:
• a block deinterleaver to block deinterleave the data with each set of a number of bit groups,
• wherein the number of bit groups is based on modulation type, and
• wherein when the modulation type is 16 Quadrature Amplitude Modulation (QAM), the number of bit groups is 4;
• a group-wise deinterleaver to group-wise deinterleave the block deinterleaved data by a unit of the bit group;
• a parity deinterleaver to parity deinterleave parity bits of data in the group-wise deinterleaved data;
• and
• a decoder to decode the bit deinterleaved data.