DTV receiving system and method of processing DTV signal

• US 9,924,206 B2
• Filed: 07/18/2017
• Issued: 03/20/2018
• Est. Priority Date: 03/26/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jong Moon, Choi, In Hwan, Kwak, Kook Yeon, Kim, Byoung Gill, Song, Won Gyu, Kim, Jin Woo, Lee, Hyoung Gon
• Primary Examiner(s): Fan, Chieh M
• Assistant Examiner(s): HAILEGIORGIS, FITWI Y
• Application Number:
  US15/653,340
• Publication Number:
  US 20180014042A1
• Time in Patent Office: 245 Days
• Field of Search: 375295
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 27/066 Carrier recovery circuits H04L27/2271 takes precedence
• CPC Class Codes: H04L 27/2272 using phase locked loops H04L27/2273 takes precedence
• CPC Class Codes: H04L 7/027 extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
• CPC Class Codes: H04L 7/042 Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15
• CPC Class Codes: H04N 21/2353 specifically adapted to content descriptors, e.g. coding, compressing or processing of metadata
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 5/455 Demodulation-circuits

Abstract

A digital television (DTV) receiving system includes an information detector, a resampler, a timing recovery unit, and a carrier recovery unit. The information detector detects a known data sequence which is periodically inserted in a digital television (DTV) signal received from a DTV transmitting system. The resampler resamples the DTV signal at a predetermined resampling rate. The timing recovery unit performs timing recovery on the DTV signal by detecting a timing error from the resampled DTV signal using the detected known data sequence. The carrier recovery unit performs carrier recovery on the resampled DTV signal by estimating a frequency offset value of the resampled DTV signal using the detected known data sequence.

Claims

1. A method of processing broadcast data in a broadcast transmitter, the method comprising:

encoding service data to add parity data;

first interleaving the encoded service data;

second interleaving the first interleaved service data;

encoding signaling data for signaling the encoded service data;

permutating a part of the encoded signaling data, wherein positions of data in a fore part of the encoded signaling data are maintained and positions of data in a rear part of the encoded signaling data are changed in the permutating step;

building a frame including a first region and a second region in symbol units,

wherein the first region of the frame is beginning with a synchronization symbol which is followed by first multiple symbols being generated from different PN sequences,

wherein the first multiple symbols are followed by second multiple symbols including information for the service data, and

wherein the second region of the frame includes the service data; and

transmitting a broadcast signal including data of the frame.

2. The method of claim 1, wherein the signaling data include information on how the service data are encoded.

3. The method of claim 1, wherein the signaling data further include information on a type of the service data in the broadcast signal.

4. The method of claim 1, wherein the signaling data further include information on a length of the service data in the broadcast signal.

5. A broadcast transmitter for processing broadcast data, the broadcast transmitter comprising:

a first encoder to encode service data to add parity data;

a first interleaver to first interleave the encoded service data;

a second interleaver to second interleave the first interleaved service data;

a second encoder to encode signaling data for signaling the encoded service data, wherein a part of the encoded signaling data is permutated, positions of data in a fore part of the encoded signaling data are maintained and positions of data in a rear part of the encoded signaling data are changed;

a frame builder to build a frame including a first region and a second region in symbol units,

wherein the first region of the frame is beginning with a synchronization symbol which is followed by first multiple symbols being generated from different PN sequences,

wherein the first multiple symbols are followed by second multiple symbols including information for the service data, and

wherein the second region of the frame includes the service data; and

a transmitting unit to transmit a broadcast signal including data of the frame.

6. The broadcast transmitter of claim 5, wherein the signaling data include information on how the service data are encoded.

7. The broadcast transmitter of claim 5, wherein the signaling data further include information on a type of the service data in the broadcast signal.

8. The broadcast transmitter of claim 5, wherein the signaling data further include information on a length of the service data in the broadcast signal.