Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals

• US 9,872,052 B2
• Filed: 08/01/2014
• Issued: 01/16/2018
• Est. Priority Date: 08/01/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Moon, Sangchul, Ko, Woosuk, Hong, Sungryong, Kim, Jinwoo, Shin, Jongwoong
• Primary Examiner(s): Liu, Shuwang
• Assistant Examiner(s): McKie, Gina
• Application Number:
  US14/905,659
• Publication Number:
  US 20160165273A1
• Time in Patent Office: 1,264 Days
• Field of Search: None
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0048 in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder for spatial equalizer H04L25/03286
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/2362 Generation or processing of Service Information [SI]
• CPC Class Codes: H04N 21/2381 Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network transmission of MPEG streams over ATM H04L12/5601
• 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 21/41407 embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57
• CPC Class Codes: H04N 21/4345 Extraction or processing of SI, e.g. extracting service information from an MPEG stream
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 21/4381 Recovering the multiplex stream from a specific network, e.g. recovering MPEG packets from ATM cells transmission of MPEG streams over ATM H04L12/5601
• 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 21/6131 involving transmission via a mobile phone network wireless downlink channel access H04W74/006
• CPC Class Codes: H04N 21/814 comprising emergency warnings arrangements specially adapted for emergency or urgency in broadcast systems H04H20/59; arrangements for providing alarms, notifications, alerts to substation in data switching networks H04L12/1895

Abstract

The present invention provides a method of transmitting broadcast signals. The method includes, encoding Data Pipe, DP, data according to a code rate, wherein the encoding further includes Low-Density Parity-Check, LDPC, encoding the DP data, Bit interleaving the LDPC encoded DP data, and mapping the bit interleaved DP data onto constellations; building at least one signal frame by mapping the encoded DP data; and modulating data in the built signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, method and transmitting the broadcast signals having the modulated data.

Claims

1. An apparatus for transmitting broadcast signals, the apparatus comprising:

an encoder to encode Data Pipe (DP) data according to a 16200 bits codeword and an 11/15 code rate based on addresses in a parity check matrix, wherein the encoded DP data comprises information bits and parity bits;

a frame builder to build at least one signal frame by mapping the encoded DP data;

modulator to modulate data in the built signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) method;

a preamble inserter to insert a preamble at a beginning of each signal frame in a time domain; and

a transmitter to transmit the broadcast signals having the preamble and the modulated data,

wherein the DP data is encoded by;

adding the information bits in groups of 360 information bits corresponding to each row of the parity check matrix to the parity bits of which addresses are based on values of entries in each row of the parity check matrix, where the parity check matrix is;

2. The apparatus of claim 1, wherein the preamble includes emergency alert information for an emergency alert.

3. The apparatus of claim 1,

wherein the addresses of the parity bits are represented as q(i, j, 1),

wherein q(i, j, 1)=q(i ,j , 0)+Q_1dpc*1(mod 4320), and

wherein q (i ,j, 0) is a value of a j-th entry in an i-th row of the parity check matrix, Q_1dpc is 12, and 1 is an index of each information bit in the group of 360 information bits.

4. An apparatus for receiving broadcast signals, the apparatus comprising:

a receiver to receive broadcast signals having a preamble and modulated data in signal frames;

a de-modulator to de-modulate the modulated data by an Orthogonal Frequency Division Multiplexing (OFDM) method;

a parser to parse at least one signal frame by de-mapping Data Pipe (DP) data; and

a decoder to decode the de-mapped DP data according to a 16200 bits codeword and an 11/15 code rate based on addresses in a parity check matrix,

wherein the de-mapped DP data includes parity bits generated by;

adding information bits in groups of 360 information bits corresponding to each row of the parity check matrix to the parity bits of which addresses are based on values of entries in each row of the parity check matrix, where the parity check matrix is;

5. The apparatus of claim 4,

wherein the preamble includes emergency alert information for an emergency alert.

6. The apparatus of claim 4,

wherein the addresses of the parity bits are represented as q(i, j, 1),

wherein q(i, j, 1)=q(i, j, 0)+Q_1dpc*1 (mod 4320), and

wherein q (i, j, 0) is a value of a j-th entry in an i-th row of the parity check matrix, Q_1dpc is 12, and 1 is an index of each information bit in the group of 360 information bits.