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US 8,013,941 B2Granted
DTV receiver and method of processing a broadcast signal in DTV receiver
AssigneeLG Electronics Inc.
InventorsJong Moon Kim, In Hwan Choi
Life of this patent
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Abstract
A DTV receiver includes a tuner, an information detector, a demodulator, and a channel equalizer. The tuner receives a broadcast signal including valid data in which a known data sequence is periodically repeated. The information detector detects location information of the known data sequence and a coarse frequency offset value of the broadcast signal. The demodulator demodulates the broadcast signal by estimating a fine frequency offset value using the detected location information and by compensating a frequency offset of the broadcast signal using the course and fine frequency offset values. Finally, the channel equalizer compensates channel distortion of the demodulated signal using the detected location information.
Claims20
A digital television (DTV) receiver comprising:
- a tuner for receiving a broadcast signal including enhanced data in which a known data sequence is periodically repeated, wherein the enhanced data result from:
- pre-processing enhanced data;
- multiplexing enhanced data packets including the pre-processed enhanced data with main data packets;
- RS coding the multiplexed main and enhanced data packets by adding systematic RS parity data to the main data packets and adding non-systematic RS parity data to the enhanced data packets;
- interleaving the RS-coded main and enhanced data;
- and
- replacing at least a portion of the non-systematic RS parity data with new RS parity data which are recalculated for backward compatibility;
- an information detector for detecting location information of the known data sequence and a coarse frequency offset value of the broadcast signal;
- a demodulator for demodulating the broadcast signal by estimating a fine frequency offset value using the detected location information and by compensating a frequency offset of the broadcast signal using the coarse and fine frequency offset values;
- and
- a channel equalizer for compensating channel distortion of the demodulated signal using the detected location information.
8 more elements
A method of processing a broadcast signal in a digital television (DTV) receiver, the method comprising:
- receiving a broadcast signal including enhanced data in which a known data sequence is periodically repeated, wherein the enhanced data result from:
- pre-processing enhanced data;
- multiplexing enhanced data packets including the pre-processed enhanced data with main data packets;
- RS coding the multiplexed main and enhanced data packets by adding systematic RS parity data to the main data packets and adding non-systematic RS parity data to the enhanced data packets;
- interleaving the RS-coded main and enhanced data;
- and
- replacing at least a portion of the non-systematic RS parity data with new RS parity data which are recalculated for backward compatibility;
- detecting location information of the known data sequence and a coarse frequency offset value from the broadcast signal;
- demodulating the broadcast signal by estimating a fine frequency offset value using the detected location information and by compensating a frequency offset of the broadcast signal using the coarse and fine frequency offset values;
- and
- compensating channel distortion of the demodulated signal using the detected location information.
8 more elements
A DTV receiver for processing digital broadcast data, the DTV receiver comprising:
- a tuner for receiving a DTV signal comprising main data and enhanced data, wherein the main and enhanced data are processed in a DTV transmitter by:
- pre-processing enhanced data;
- multiplexing enhanced data packets including the pre-processed enhanced data with main data packets;
- randomizing MPEG header data in the multiplexed enhanced data packets;
- randomizing the multiplexed main data packets;
- RS coding the enhanced data packets having the randomized MPEG header data and the randomized main data packets by adding systematic RS parity data to the randomized main data packets and adding non-systematic RS parity data to the enhanced data packets having the randomized MPEG header data;
- interleaving the RS-coded main and enhanced data packets;
- and
- replacing at least a portion of the non-systematic RS parity data with new RS parity data which are recalculated for backward compatibility;
- a first decoder for inner decoding the received DTV signal;
- and
- a second decoder for outer decoding the inner-decoded DTV signal,
- wherein pre-processing the enhanced data comprises randomizing the enhanced data and deinterleaving the randomized enhanced data.
10 more elements
A method of processing digital broadcast data in a DTV receiver, the method comprising:
- receiving a DTV signal comprising main data and enhanced data, wherein the main and enhanced data are processed in a DTV transmitter by:
- pre-processing enhanced data;
- multiplexing enhanced data packets including the pre-processed enhanced data with main data packets;
- randomizing MPEG header data in the multiplexed enhanced data packets;
- randomizing the multiplexed main data packets;
- RS coding the enhanced data packets having the randomized MPEG header data and the randomized main data packets by adding systematic RS parity data to the randomized main data packets and adding non-systematic RS parity data to the enhanced data packets having the randomized MPEG header data;
- interleaving the RS-coded main and enhanced data packets;
- and
- replacing at least a portion of the non-systematic RS parity data with new RS parity data which are recalculated for backward compatibility;
- inner decoding the received DTV signal;
- and
- outer decoding the inner-decoded DTV signal,
- wherein pre-processing the enhanced data comprises randomizing the enhanced data and deinterleaving the randomized enhanced data.
10 more elements
Dependencies are inferred from the claim text.