Apparatus for generating broadcast signal frame using enhanced layer dummy values and method using the same

An apparatus for generating broadcast signal frame, comprising a processor and a memory storing at least one instruction to be executed by the processor, wherein the at least one instruction is configured to:

• generate a multiplexed signal by combining a core layer signal and an enhanced layer signal;
• reduce power of the multiplexed signal to a power level corresponding to the core layer signal;
• generate a time-interleaved signal by performing time interleaving that is applied to both a core layer corresponding to the core layer signal and an enhanced layer corresponding to the enhanced layer signal;
• and
• generate a broadcast signal frame including a preamble for signaling time interleaver information corresponding to the time interleaving,
• wherein the time interleaving is performed by using at least one of time interleaver groups,
• wherein the at least one of the time interleaver groups include corresponds to enhanced layer data including dummy values,
• wherein the dummy values are inserted after actual data cells of a last Enhanced physical layer pipe (PLP) in a PLP group so that a total number of Enhanced Layer cells in the PLP group is the same as a total number of Core Layer cells in the PLP group,
• wherein the Enhanced Layer cells correspond to the enhanced layer signal, and the Core Layer cells correspond to the core layer signal, and
• wherein the dummy values have the same power as the last Enhanced PLP.