Apparatus for broadcasting scalable video contents and method using the same

An apparatus for broadcasting scalable video contents, comprising:

• a video codec unit configured to generate a plurality of codec layer signals by dividing codec media stream into a plurality of layers, the codec layer signals including a base layer signal and an enhancement layer signal of scalable video codec layer signals corresponding to a scalable video coding;
• and
• a broadcasting signal multiplexing unit configured to generate a layered-division-multiplexed broadcasting signal by combining the codec layer signals at different power levels, the broadcasting signal multiplexing unit comprising:
• a first Bit-Interleaved Coded Modulation (BICM) unit configured to generate a core layer signal including core layer symbols according to the base layer signal,
• a second BICM unit configured to generate an enhanced layer signal including enhanced layer symbols according to the enhancement layer signal,
• an injection level controller configured to generate a power-reduced enhanced layer signal by reducing a power of the enhanced layer signal,
• a combiner configured to generate a multiplexed signal using a sum of the core layer signal and the power-reduced enhanced layer signal,
• a power normalizer configured to reduce a power level of the multiplexed signal to a power level corresponding to the core layer signal,
• a time interleaver configured to generate a time-interleaved signal by performing time interleaving that is applied to both the core layer signal and the power-reduced enhanced layer signal, and
• a circuit to generate a broadcast signal frame corresponding to the layered-division-multiplexed broadcasting signal using the time-interleaved signal.