Apparatus for transmitting and receiving a signal and method of transmitting and receiving a signal

An apparatus of transmitting broadcast signals, the apparatus comprising:

• a signaling encoder to encode signaling data by an LDPC (Low Density Parity Check) scheme;
• an encoder to encode data by at least one code rate;
• a mapper to map the encoded data onto constellations by using Non-uniform constellations;
• a frame builder to build at least one signal frame based on at least one preamble data symbol having the encoded signaling data and data symbols having the mapped data;
• a modulator to insert at least one pilot into each of the built at least one signal frame with a specific pattern and modulating the at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplexing) method;
• and
• a transmitter to transmit broadcast signals having the modulated at least one signal frame,
• wherein the signaling data includes channel bonding information for the broadcast signals.

A method of receiving broadcast signals, the method comprising:

• receiving the broadcast signals;
• demodulating the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplexing) method;
• detecting at least one pilot in the demodulated broadcast signals;
• parsing at least one signal frame from the demodulated broadcast signals, wherein a signal frame includes at least one preamble data symbol having signaling data and data symbols;
• decoding the signaling data by an LDPC (Low Density Parity Check) scheme;
• demapping data in the data symbols using Non-uniform constellations;
• and
• decoding the demapped data by at least one code rate,
• wherein the signaling data includes channel bonding information for the broadcast signals.

An apparatus of receiving broadcast signals, the apparatus comprising:

• a receiver to receive the broadcast signals;
• a demodulator to demodulate the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplexing) method and detect at least one pilot in the demodulated broadcast signals;
• a frame parser to parse at least one signal frame from the demodulated broadcast signals, wherein the at least one signal frame includes at least one preamble data symbol having signaling data and data symbols;
• a signaling decoder to decode the signaling data by an LDPC (Low Density Parity Check) scheme;
• a demapper to demap data in the data symbols using Non-uniform constellations;
• and
• a decoder to decode the demapped data by at least one code rate,
• wherein the signaling data includes channel bonding information for the broadcast signals.