Digital broadcasting system and method of processing

• US 8,218,675 B2
• Filed: 08/04/2011
• Issued: 07/10/2012
• Est. Priority Date: 03/26/2007
• Status: Expired due to Fees

• 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): Williams, Lawrence B
• Application Number:
  US13/198,643
• Publication Number:
  US 20110286532A1
• Time in Patent Office: 341 Days
• Field of Search: 375/240.27, 375/295, 375/316, 375340-341, 348723-726, 714/752, 714/756, 714/758, 714/781, 714/784
• US Class Current: 375/295
• 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 method and apparatus is provided for processing broadcast data in a digital broadcast transmitter. The method includes performing Reed-Solomon (RS) encoding and Cyclic Redundancy Check (CRC) encoding on mobile service data to build an RS frame, dividing the RS frame into a plurality of portions, mapping one of the plurality of portions into a first data group that has a first region and a second region and adding known data sequences and place holders for MPEG header data to the first data group, deinterleaving data in the first data group to output a second data group, replacing the place holders for MPEG header data in the second data group with MPEG header data such that mobile service data packets are output and interleaving data in the mobile service data packets.

Claims

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

performing Reed-Solomon (RS) encoding and Cyclic Redundancy Check (CRC) encoding on mobile service data to build an RS frame;

dividing the RS frame into a plurality of portions;

mapping one of the plurality of portions into a first data group and adding known data sequences and place holders for moving picture experts group (MPEG) header data to the first data group,

wherein the first data group comprises a first region and a second region,

wherein the first region comprises;

an Nth segment comprising K mobile service data bytes,

an (N+1)th segment comprising L mobile service data bytes, and

an (N+2)th segment comprising M mobile service data bytes,

wherein the second region comprises;

an Oth segment comprising X mobile service data bytes,

an (O+1)th segment comprising Y mobile service data bytes, and

an (O+2)th segment comprising Z mobile service data bytes,

wherein the variables K, L, M, N, O, X, Y, Z are integers greater than 0, and

wherein K<

L<

M, X=Y=Z, and N<

O;

deinterleaving, by a deinterleaver, data in the first data group to output a second data group;

replacing, by a packet formatter, the place holders for MPEG data in the second data group MPEG header data, such that mobile service data packets are output; and

interleaving, by an interleaver, data in the mobile service data packets.

2. The method of claim 1, further comprising:

encoding data in the plurality of portions at a code rate of 1/H,

wherein H is greater than 1.

3. The method of claim 1, wherein the RS frame comprises:

an RS frame payload including the mobile service data;

RS parity data added at bottom ends of columns of the RS frame payload; and

CRC data added at right ends of rows of the RS frame payload including the RS parity data.

4. The method of claim 1, wherein at least two of the known data sequences are spaced 16 segments apart.

5. The method of claim 1, wherein at least two of the known data sequences differ from each other in length.

6. A digital broadcast transmitter, comprising:

a first encoder configured to perform Reed-Solomon (RS) encoding and Cyclic Redundancy Check (CRC) encoding on mobile service data to build an RS frame and to divide the RS frame into a plurality of portions;

a group formatting unit configured to map one of the plurality of portions into a first data group and adding known data sequences and place holders for moving picture expert groups (MPEG) header data to the first data group,

wherein the first data group comprises a first region and a second region,

wherein the first region comprises;

an Nth segment comprising K mobile service data bytes,

an (N-1)th segment comprising L mobile service data bytes,

an (N+2)th segment comprising M mobile service data bytes,

wherein the second region comprises;

an Oth segment comprising X mobile service data bytes,

an (O+1)th segment comprising Y mobile service data bytes, and

an (O+2)th segment comprising Z mobile service data bytes,

wherein the variables K, L, M, N, 0, X, Y, Z are integers greater than 0, and

wherein K<

L<

M, X=Y=Z, and N<

O;

a deinterleaver for deinterleaving data in the first data group to output a second data group;

a packet formatter configured to replace the place holders for MPEG data in the second data group MPEG header data, such that mobile service data packets are output; and

an interleaver configured to interleave data in the mobile service data packets.

7. The digital broadcast transmitter of claim 6, further comprising:

a second encoder configured to encode data in the plurality of portions at a code rate of 1/H,

wherein H is greater than 1.

8. The digital broadcast transmitter of claim 6, wherein the RS frame comprises:

an RS frame payload including the mobile service data;

RS parity data added at bottom ends of columns of the RS frame payload; and

CRC data added at right ends of rows of the RS frame payload including the RS parity data.

9. The digital broadcast transmitter of claim 6, wherein at least two of the known data sequences are spaced 16 segments apart.

10. The digital broadcast transmitter of claim 6, wherein at least two of the known data sequences differ from each other in length.