ENHANCED VSB VITERBI DECODER

• US 20100271555A1
• Filed: 06/25/2010
• Published: 10/28/2010
• Est. Priority Date: 11/16/2004
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: CHOI, In Hwan, KANG, Kyong Won
• Granted Patent: US 8,135,095 B2
• Time in Patent Office: Days
• US Class Current: 348/720
• CPC Class Codes: H03M 13/2707 Simple row-column interleaver, i.e. pure block interleaving
• CPC Class Codes: H03M 13/3961 Arrangements of methods for branch or transition metric calculation
• CPC Class Codes: H03M 13/4107 implementing add, compare, select [ACS] operations
• CPC Class Codes: H03M 13/6331 Error control coding in combination with equalisation
• CPC Class Codes: H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence
• CPC Class Codes: H04L 27/06 Demodulator circuits; Receiver circuits

Abstract

An enhanced VSB receiver includes a tuner which tunes an RF signal and converts it into an IF signal, an IF mixer which converts the IF signal into a baseband signal, and a demodulator which demodulates the baseband signal signal into a VSB signal. The enhanced VSB receiver further includes a map recovery unit which recovers VSB map information of the VSB signal, an enhanced equalizer for compensating channel distortion of the VSB signal and outputting an equalized symbol, and an enhanced Viterbit decoder for estimating whether polarity inversion occurred during a symbol period of the equalized symbol and Viterbi-decoding the equalized symbol based on the polarity estimation.

Claims

1-27. -27. (canceled)

28. A method for processing a digital television (DTV) broadcast signal in a broadcasting receiver, the method comprising:

receiving, by a tuner, the DTV broadcast signal including enhanced data;

decoding, by a decoder, the enhanced data included in the received DTV broadcast signal; and

derandomizing, by a derandomizer, the decoded enhanced data,

wherein the enhanced data results from;

randomizing original enhanced data,

first Reed Solomon (RS) encoding the randomized original enhanced data,

convolutional encoding the first RS-encoded original enhanced data,

second RS encoding the convolutional encoded original enhanced data,

interleaving the second RS-encoded original enhanced data, and

trellis encoding the interleaved original enhanced data.

29. The method of claim 28, wherein the received DTV broadcast signal further includes main data that the convolutional encoding is not performed.

30. The method of claim 28, further comprising:

equalizing the received DTV broadcast signal by compensating channel distortion of the received DTV broadcast signal.

31. The method of claim 30, further comprising:

decoding symbol attribute information from the equalized DTV broadcast signal, wherein the symbol attribute information includes information indicating whether a symbol of the enhanced data is coded at a ½

code rate or at a ¼

code rate.

32. The method of claim 31, wherein the enhanced data is decoded based on the symbol attribute information.

33. The method of claim 28, wherein the received DTV broadcast signal further includes segment synchronization data and field synchronization data.

34. A broadcasting receiver for processing a digital television (DTV) broadcast signal, the broadcasting receiver comprising:

a tuner for receiving the DTV broadcast signal including enhanced data;

a decoder for decoding the enhanced data included in the received DTV broadcast signal; and

a derandomizer for derandomizing the decoded enhanced data,

wherein the enhanced data results from;

randomizing original enhanced data,

first Reed Solomon (RS) encoding the randomized original enhanced data,

convolutional encoding the first RS-encoded original enhanced data,

second RS encoding the convolutional encoded original enhanced data,

interleaving the second RS-encoded original enhanced data, and

trellis encoding the interleaved original enhanced data.

35. The broadcasting receiver of claim 34, wherein the received DTV broadcast signal further includes main data that the convolutional encoding is not performed.

36. The broadcasting receiver of claim 34, further comprising:

an equalizer for equalizing the received DTV broadcast signal by compensating channel distortion of the received DTV broadcast signal.

37. The broadcasting receiver of claim 36, further comprising:

an information recovery unit for decoding symbol attribute information from the equalized DTV broadcast signal, wherein the symbol attribute information includes information indicating whether a symbol of the enhanced data is coded at a ½

code rate or at a ¼

code rate.

38. The broadcasting receiver of claim 37, wherein the decoder decodes the enhanced data based on the symbol attribute information.

39. The broadcasting receiver of claim 34, wherein the received DTV broadcast signal further includes segment synchronization data and field synchronization data.