Broadcasting signal frame generation apparatus and method using layered divisional multiplexing

A method of generating broadcast signal frame, comprising:

• generating a multiplexed signal by combining a core layer signal and an enhanced layer signal at different power levels;
• reducing power of the multiplexed signal to a power level corresponding to the core layer signal by using a normalizing factor which is applied to both the core layer signal and the enhanced layer signal after combining the core layer signal and the enhanced layer signal;
• generating a time-interleaved signal by performing time interleaving that is applied to both the core layer signal and the enhanced layer signal in the multiplexed signal;
• and
• generating a broadcast signal frame including a preamble for signaling time interleaver information shared by the core layer signal and the enhanced layer signal in the multiplexed signal, the time interleaver information is information about a time interleaver operation,
• wherein the normalizing factor is a value that is larger than 0 and smaller than 1, and increases as a reduction in power corresponding to the enhanced layer signal becomes larger,
• wherein the preamble includes a PLP identification information for identifying Physical Layer Pipes (PLPs) and a layer identification information for identifying layers corresponding to division of layers,
• wherein the time interleaver information is included in the preamble for each of the Physical Layer Pipes (PLPs) inside of a NUM_PLP loop independently of the layer identification information,
• wherein the broadcast signal frame includes a payload corresponding to the multiplexed signal.