RECEIVING SYSTEM AND METHOD FOR PROCESSING DIGITAL BROADCAST SIGNAL IN THE RECEIVING SYSTEM

• US 20120099660A1
• Filed: 10/19/2011
• Published: 04/26/2012
• Est. Priority Date: 10/20/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Mun, Chulkyu, Kim, Jinwoo, Choi, Inhwan, Kim, Byounggill, Song, Wongyu
• Granted Patent: US 8,964,857 B2
• Time in Patent Office: Days
• US Class Current: 375/240.27
• 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 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/256 with trellis coding, e.g. with convolutional codes and TCM
• CPC Class Codes: H03M 13/2721 the interleaver involves a diagonal direction, e.g. by using an interleaving matrix with read-out in a diagonal direction
• CPC Class Codes: H03M 13/2921 wherein error correction coding involves a diagonal direction
• CPC Class Codes: H03M 13/293 with erasure setting
• CPC Class Codes: H03M 13/2966 Turbo codes concatenated with another code, e.g. an outer block code
• CPC Class Codes: H03M 13/2972 Serial concatenation using convolutional component codes
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H04H 20/57 for mobile receivers
• CPC Class Codes: H04L 1/005 Iterative decoding, including iteration between signal detection and decoding operation
• 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 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 2027/0026 Correction of carrier offset
• CPC Class Codes: H04L 25/0212 of impulse response
• CPC Class Codes: H04L 27/06 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 69/00 : Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass networks security protocols H04L9/40; wireless communication networks H04W
• CPC Class Codes: H04N 19/66 : involving data partitioning, i.e. separation of data into packets or partitions according to importance
• CPC Class Codes: H04N 21/23608 : Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/23611 : Insertion of stuffing data into a multiplex stream, e.g. to obtain a constant bitrate synchronisation arrangements in time-division multiplex systems using bit stuffing for systems with different or fluctuating information rates H04J3/073
• CPC Class Codes: H04N 21/2362 : Generation or processing of Service Information [SI]
• 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 21/2389 : Multiplex stream processing, e.g. multiplex stream encrypting
• 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 21/4383 : Accessing a communication channel
• CPC Class Codes: H04N 21/6112 : involving terrestrial transmission, e.g. DVB-T
• CPC Class Codes: H04N 7/24 : Systems for the transmission of television signals using pulse code modulation H04N21/00 takes precedence

Abstract

A transmitting system, a receiving system, and a method of processing broadcast signals are disclosed. The method for processing a broadcast signal in a broadcast receiver comprises receiving a DTV signal including a data group, the data group including mobile service data, segmented known data sequences, long known data sequences and transmission parameter data, compensating carrier frequency offset of the DTV signal and channel-equalizing the carrier frequency offset compensated DTV signal using at least one of the long known data sequences and segmented known data sequences in the data group of the DTV signal, wherein the channel-equalizing includes performing a Error Correction (FEC) decoding on data located between the segmented known data sequences, and estimating Channel Impulse Response (CIR) using the FEC decoded data as known data.

Claims

1. An apparatus for receiving a broadcast signal, the apparatus comprising:

a tuner configured to receive a DTV signal including a data group, the data group including mobile service data, segmented known data sequences, long known data sequences and transmission parameter data;

a channel synchronizer configured to compensate carrier frequency offset of the DTV signal; and

a channel equalizer configured to channel-equalize the carrier frequency offset compensated DTV signal using at least one of the long known data sequences and segmented known data sequences in the data group of the DTV signal,

wherein the channel equalizer further configured to perform a Error Correction (FEC) decoding on data located between the segmented known data sequences and estimate Channel Impulse Response (CIR) using the FEC decoded data as known data.

2. The apparatus of claim 1, wherein the channel equalizer includes:

a CIR estimator configured to estimate a first CIR using the long known data sequence; and

a decision device configured to FEC decode the data located between the segmented known data sequences;

wherein the CIR estimator further configured to estimate a second CIR using the segmented known data sequence and the FEC decoded data.

3. The apparatus of claim 2, wherein the channel equalizer further configured to iterate estimating CIR by receiving feedback of the FEC decoded data from the decision device and DTV signal which is buffered for a period during a processing in the decision device.

4. The apparatus of claim 1, wherein the channel equalizer includes:

a pre-equalizer configured to perform a pre-equalizing for the carrier frequency offset compensated DTV signal;

a decision device configured to perform a FEC decoding on the data located between the segmented known data sequences of the pre-equalized DTV signal;

a buffer configured to perform a buffering the carrier frequency offset compensated DTV signal during a processing of the pre-equalizer and decision device; and

a post-equalizer configured to estimate CIR for the buffered DTV signal using the FEC decoded data as known data.

5. The apparatus of claim 1, wherein the channel equalizer further configured to select first CIR of which value is over a threshold value, and estimate second CIR using a filter having length which is shorter than a channel length and covers the first CIR.

6. A method for processing a broadcast signal in a broadcast receiver, the method comprising:

receiving a DTV signal including a data group, the data group including mobile service data, segmented known data sequences, long known data sequences and transmission parameter data;

compensating carrier frequency offset of the DTV signal; and

channel-equalizing the carrier frequency offset compensated DTV signal using at least one of the long known data sequences and segmented known data sequences in the data group of the DTV signal,

wherein the channel-equalizing includes performing a Error Correction (FEC) decoding on data located between the segmented known data sequences, and estimating Channel Impulse Response (CIR) using the FEC decoded data as known data.

7. The method of claim 6, wherein the channel-equalizing includes:

estimating a first CIR using the long known data sequence;

performing FEC decoding the data located between the segmented known data sequences at a decision device; and

estimating a second CIR using the segmented known data sequence and the FEC decoded data.

8. The method of claim 7, wherein the channel-equalizing further includes:

iterating estimating CIR by using feedback of the FEC decoded data from the decision device and DTV signal which is buffered for a period during a processing in the decision device.

9. The method of claim 6, wherein channel-equalizing further includes:

performing a pre-equalizing for the carrier frequency offset compensated DTV signal;

performing a FEC decoding on the data located between the segmented known data sequences of the pre-equalized DTV signal at a decision device;

performing a buffering the carrier frequency offset compensated DTV signal during a processing of the pre-equalizing and decision device; and

estimating CIR for the buffered DTV signal using the FEC decoded data as known data.

10. The method of claim 6, wherein the channel-equalizing further includes:

selecting first CIR of which value is over a threshold value; and

estimating second CIR using a filter having length which is shorter than a channel length and covers the first CIR.