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

• US 10,009,079 B2
• Filed: 09/13/2017
• Issued: 06/26/2018
• 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): KASSA, ZEWDU A
• Application Number:
  US15/703,587
• Publication Number:
  US 20180048368A1
• Time in Patent Office: 286 Days
• Field of Search: 375267, 375260, 375259, 375316, 375295
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0047 Decoding adapted to other signal detection operation in conjunction with sequence estimation or equalization H04L25/03286
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0063 Single parity check
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2637 with direct modulation of individual subcarriers
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• 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 21/4381 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 7/08 : Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band , e.g. by time division H04N7/007 takes precedence
• CPC Class Codes: H05K 999/99 : dummy group

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 service data according to a 64800 bit codeword and a 10/15 code rate based on addresses in a parity check matrix, wherein the encoded service data comprises information bits and parity bits;

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

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

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

wherein the encoding of the service data comprises;

initializing the parity bits,

adding the information bits to the parity bits of which addresses are based on values of entries in each row of the parity check matrix, wherein a row of the parity check matrix corresponds to a 360 bit group of the information bits, and

wherein the parity check matrix is

2. The apparatus of claim 1, wherein the addresses of the parity bits are represented as q(i,j,l), and

wherein q(i,j,l) =q (i,j,0) +Q_ldpc *1(mod 21600)

wherein q (i,j,0) is a value of a j-th entry in an i-th row of the parity check matrix, Q_ldpc is 60,1is an index of each information bit in the 360 bit group.

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

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

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

a parser to parse at least one signal frame by de-mapping service data; and

a decoder to decode the service data according to a 64800 bit codeword and a 10/15 code rate based on addresses in a parity check matrix,

wherein the service data includes parity bits generated by;

initializing the parity bits,

adding the information bits to the parity bits of which addresses are based on values of entries in each row of the parity check matrix, wherein a row of the parity check matrix corresponds to a 360 bit group of the information bits, and wherein the parity check matrix is

4. The apparatus of claim 3,

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

wherein q(i,j,l) =q (i,j,0) +Q_ldpc *1 (mod 21600)

wherein q (i,j,0) is a value of a j-th entry in an i-th row of the parity check matrix, Q_ldpc is 60, 1 is an index of each information bit in the 360 bit group.