Digital broadcasting system and method of processing data

• US 9,912,354 B2
• Filed: 10/16/2015
• Issued: 03/06/2018
• 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): Chery, Dady
• Application Number:
  US14/885,882
• Publication Number:
  US 20160112067A1
• Time in Patent Office: 872 Days
• Field of Search: 370328, 370535, 370537, 370464, 370465, 375230, 37524025, 375295
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H03M 13/2792 Interleaver wherein interleaving is performed jointly with another technique such as puncturing, multiplexing or routing
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 2027/003 at baseband only
• CPC Class Codes: H04L 27/0014 Carrier regulation of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657
• CPC Class Codes: H04L 7/0029 interpolation of received data signal
• CPC Class Codes: H04L 7/042 Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15
• 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 21/4382 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: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

Abstract

A digital broadcast receiving system includes a known data detector, a carrier recovery unit, and a timing recovery unit. The known data detector may detect known data information inserted and transmitted from a digital broadcast transmitting system and using the known data information to estimate initial frequency offset. The carrier recovery unit may obtain initial synchronization by using the initial frequency offset, and may detect frequency offset from the received data by using the known sequence position indicator so as to perform carrier recovery. The timing recovery unit may detect timing error information from the received signal by using the known sequence position indicator so as to perform timing recovery.

Claims

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

randomizing first service data;

performing Cyclic Redundancy Check (CRC) encoding on the randomized first service data;

performing encoding on the CRC-encoded first service data at a first code rate;

performing encoding on transmission parameters at a second code rate;

block interleaving the first service data encoded at the first code rate;

multiplexing the block-interleaved first service data and second service data; and

convolutional interleaving the multiplexed service data,

wherein the first service data have a different robustness level from the second service data.

2. The method of claim 1, wherein the transmission parameters include information to identify whether the CRC-encoding is performed.

3. The method of claim 1, wherein the transmission parameters include multiplexing information of the first service data and the second service data.

4. A digital broadcast transmitter for processing digital broadcast data, the digital broadcast transmitter comprising:

a randomizer to randomize first service data;

a first encoder to perform Cyclic Redundancy Check (CRC) encoding on the randomized first service data;

a second encoder to perform encoding on the CRC-encoded first service data at a first code rate and to perform encoding on transmission parameters at a second code rate;

a first interleaver to block interleave the first service data encoded at the first code rate;

a multiplexer to multiplex the block-interleaved first service data and second service data; and

a second interleaver to convolutional interleave the multiplexed service data,

wherein the first service data have a different robustness level from the second service data.

5. The digital broadcast transmitter of claim 4, wherein the transmission parameters include information to identify whether the CRC-encoding is performed.

6. The digital broadcast transmitter of claim 4, wherein the transmission parameters include multiplexing information of the first service data and the second service data.