Digital broadcast receiver and method of processing data in digital broadcast receiver

• US 7,831,885 B2
• Filed: 07/07/2008
• Issued: 11/09/2010
• Est. Priority Date: 07/04/2007
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Byoung Gill, Lee, Hyoung Gon, Choi, In Hwan, Song, Won Gyu, Kwak, Kook Yeon, Kim, Jin Woo
• Primary Examiner(s): Abraham; Esaw T
• Application Number:
  US12/168,889
• Publication Number:
  US 20090037792A1
• Time in Patent Office: 855 Days
• Field of Search: 714/755, 714/784, 714/790, 375/265, 348/406.1
• US Class Current: 714/755
• CPC Class Codes: G06F 11/10 Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
• CPC Class Codes: H03M 13/251 with block coding
• CPC Class Codes: H03M 13/271 Row-column interleaver with permutations, e.g. block interleaving with inter-row, inter-column, intra-row or intra-column permutations
• CPC Class Codes: H03M 13/2792 Interleaver wherein interleaving is performed jointly with another technique such as puncturing, multiplexing or routing
• CPC Class Codes: H03M 13/2936 comprising an outer Reed-Solomon code and an inner convolutional code
• CPC Class Codes: H04H 20/30 by a single channel
• CPC Class Codes: H04H 20/57 for mobile receivers
• CPC Class Codes: H04H 40/27 specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0042 Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape H04L1/0067 takes precedence
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• 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 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 2025/03382 Single of vestigal sideband
• CPC Class Codes: H04L 25/0202 Channel estimation
• CPC Class Codes: H04L 27/066 Carrier recovery circuits H04L27/2271 takes precedence
• CPC Class Codes: H04L 63/08 : for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04N 21/23608 : Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/2365 : Multiplexing of several video streams
• 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 21/2385 : Channel allocation H04N21/266 takes precedence; Bandwidth allocation H04N21/24 takes precedence ; allocation of channels according to the instantaneous demands of the users in time-division multiplex systems H04J3/1682; admission control, resource allocation in open networks H04L12/5692; arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896; negotiating bandwidth in wireless networks H04W28/16
• 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 21/4347 : Demultiplexing of several 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 21/44008 : involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream arrangements characterised by components specially adapted for monitoring, identification or recognition of video in broadcast systems H04H60/59
• CPC Class Codes: H04N 21/6433 : Digital Storage Media - Command and Control Protocol [DSM-CC]

Abstract

A digital receiving system, and a method of processing data are disclosed. The digital receiving system includes a receiving unit, a known sequence detector, and a channel equalizer. The receiving unit receives a broadcast signal including mobile service data and main service data. The known sequence detector detects known data linearly inserted in a data group. The channel equalizer performs channel-equalizing on the received mobile service data using the detected known data.

Claims

1. A receiving system, comprising:

a signal receiving unit receiving a broadcast signal, the broadcast signal comprising a data group, the data group comprising mobile service data and a plurality of known data sequences, wherein at least two of the plurality of known data sequences differ from each other in length and are spaced 16 segments apart, wherein one of the plurality of known data sequences includes a first M-symbol sequence and a second M-symbol sequence that have a first pattern, the rest of the plurality of known data sequences includes a N-symbol sequence that has a second pattern that is different from the first pattern, and wherein N is greater than M;

a known data detector detecting the plurality of known data sequences from the data group; and

an equalizer compensating for channel distortion generated in the data group using the plurality of detected known data sequences.

2. The receiving system of claim 1, wherein a transmission parameter is received by being inserted in between the plurality of known data sequences.

3. The receiving system of claim 2, further comprising:

a block decoder turbo-decoding by a block unit the mobile service data within the channel distortion compensated data group based on block encoding information included in the transmission parameter; and

a power control unit controlling power to receive the data group including the mobile service data based on the transmission parameter.

4. The receiving system of claim 3, wherein the block decoder comprises:

a first decoding unit performing trellis decoding by matching the mobile service data of the data group inputted in a block size for turbo decoding and the mobile service data fed back by being symbol-decoded; and

a second decoding unit performing symbol decoding on the trellis-decoded mobile service data and then feeding back the symbol-decoded mobile service data to the first decoding unit.

5. The receiving system of claim 1, further comprising:

a Reed-Solomon (RS) frame decoder generating an RS frame from a plurality of data groups, the RS frame comprising at least one data packet for the mobile service data, an RS parity data generated based on the at least one data packet and a Cyclic Redundancy Check (CRC) checksum data generated based on the at least one data packet and the RS parity data, the RS frame decoder correcting errors generated from the mobile service data by performing CRC decoding and RS decoding on the RS frame.

6. The receiving system of claim 5, wherein the RS frame decoder generates a reliability map indicating reliability information of each mobile service data within the RS frame and then corrects errors generated from the mobile service data based upon a number of errors generated from performing the CRC decoding on the RS frame and the reliability information of the reliability map.

7. The receiving system of claim 6, wherein, if the number of errors indicated on an error flag corresponding to each row within the RS frame is equal to or smaller than a number of the RS parity data added in a column direction of the RS frame, the RS frame decoder performs RS eraser decoding on all columns of the RS frame in the column direction.

8. The receiving system of claim 6, wherein, if the number of errors indicated on an error flag corresponding to each row within the RS frame is greater than a number of the RS parity data added in a column direction of the RS frame, the RS frame decoder determines for each column either general RS decoding or RS erase decoding based upon the reliability information of the reliability map and then performs error correction by using the error correction decoding method determined for each corresponding column.

9. The receiving system of claim 5, further comprising:

a derandomizer derandomizing the error-corrected mobile service data.

10. A method of processing data in a receiving system, the method comprising:

receiving a broadcast signal, the broadcast signal comprising a data group, the data group comprising mobile service data and a plurality of known data sequences, wherein at least two of the plurality of known data sequences differing from each other in length and are spaced 16 segments apart, wherein one of the plurality of known data sequences includes a first M-symbol sequence and a second M-symbol sequence that have a first pattern, the rest of the plurality of known data sequences includes a N-symbol sequence that has a second pattern that is different from the first pattern, and wherein N is greater than M;

detecting the plurality of known data sequences from the data group; and

compensating for channel distortion generated in the data group using the plurality of detected known data sequences.

11. The method of claim 10, wherein a transmission parameter is received by being inserted in between the plurality of known data sequences.

12. The method of claim 11, further comprising:

turbo-decoding by a block unit the mobile service data within the channel distortion compensated data group based on block encoding information included in the transmission parameter; and

controlling power to receive the data group including the mobile service data based on the transmission parameter.

13. The method of claim 12, wherein turbo-decoding the mobile service data comprises:

performing trellis decoding by matching the mobile service data of the data group inputted in a block size for turbo decoding and the mobile service data fed back by being symbol-decoded; and

performing symbol decoding on the trellis-decoded mobile service data and then feeding back the symbol-decoded mobile service data in order to trellis-decode.

14. The method of claim 10, further comprising:

generating an RS frame from a plurality of data groups, the RS frame comprising at least one data packet for the mobile service data, an RS parity data generated based on the at least one data packet and a CRC checksum data generated based on the at least one data packet and the RS parity data; and

correcting errors generated from the mobile service data by performing CRC decoding and RS decoding on the RS frame.

15. The method of claim 14, wherein correcting errors generated from the mobile service data comprises:

generating a reliability map indicating reliability information of each mobile service data within the RS frame, and correcting errors generated from the mobile service data based upon a number of errors generated from performing the CRC decoding on the RS frame and the reliability information of the reliability map.

16. The method of claim 15, wherein correcting errors generated from the mobile service data further comprises:

performing RS eraser decoding on all columns of the RS frame in the column direction if the number of errors indicated on an error flag corresponding to each row within the RS frame is equal to or smaller than a number of the RS parity data added in a column direction of the RS frame.

17. The method of claim 15, wherein correcting errors generated from the mobile service data further comprises:

determining for each column either general RS decoding or RS erase decoding based upon the reliability information of the reliability map and then performing error correction by using the error correction decoding method determined for each corresponding column if the number of errors indicated on an error flag corresponding to each row within the RS frame is greater than a number of the RS parity data added in a column direction of the RS frame.

18. The method of claim 14, further comprising:

derandomizing the error-corrected mobile service data.