Patent ID: 11943090
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A broadcast signal reception apparatus, comprising:
an OFDM receiver configured to generate a received signal by performing any one or any combination of any two or more of synchronization, channel estimation and equalization, the received signal corresponding to a multiplexed signal;
a time deinterleaver configured to perform time deinterleaving on the received signal;
a core layer BICM decoder configured to restore core layer data of the multiplexed signal;
an enhanced layer symbol extractor configured to extract enhanced layer symbols by performing cancellation corresponding to the core layer data; and
an enhanced layer BICM decoder configured to restore enhanced layer data corresponding to the enhanced layer symbols,
wherein the multiplexed signal corresponds to a combination of a core layer signal and a power-reduced enhanced layer signal,
wherein the power-reduced enhanced layer signal is generated corresponding to a scaling factor by an injection level controller of a transmitter and is generated from an enhanced layer signal, and the power of the multiplexed signal is reduced corresponding to a normalizing factor in the transmitter,
wherein the scaling factor decreases as a power reduction corresponding to the power-reduced enhanced layer signal becomes larger, and the normalizing factor increases as the power reduction becomes larger, and
wherein the injection level controller changes an injection level with one of predetermined step sizes, the step sizes including 0.5 dB.