Broadcast signal transmitter/receiver, and broadcast signal transceiving method

A broadcast signal transmitter for transmitting a broadcast signal, the method comprising:

• a first encoder to Forward Error Correction (FEC) encode first layer data of a first physical layer pipe (PLP);
• a second encoder to FEC encode second layer data of a second PLP;
• a third encoder to FEC encode signaling data;
• a builder to build a frame including the FEC encoded first layer data and second layer data, and the FEC encoded signaling data;
• a pilot inserter to insert pilot data into the built frame;
• a modulator to modulate data of the built frame by an Orthogonal Frequency Division Multiplexing (OFDM) method;
• a preamble inserter to insert a first OFDM symbol and a second OFDM symbol in front of the modulated built frame in a time domain;
• and
• a transmitter to transmit the broadcast signal including the built frame,
• wherein a postfix of the first OFDM symbol and a prefix of the second OFDM symbol are sequentially positioned in the time domain,
• wherein the signaling data includes type information for the first PLP including the first layer data, excluding the second PLP including the second layer data.