Channel equalizer and method of processing broadcast signal in DTV receiving system

• US 9,185,413 B2
• Filed: 07/10/2013
• Issued: 11/10/2015
• Est. Priority Date: 02/10/2006
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Byoung Gill, Choi, In Hwan, Kang, Kyung Won, Kwak, Kook Yeon, Kim, Woo Chan
• Primary Examiner(s): Washburn, Daniel
• Assistant Examiner(s): HUGHES, EBONI N
• Application Number:
  US13/938,700
• Publication Number:
  US 20130294528A1
• Time in Patent Office: 853 Days
• US Class Current: 1/1
• 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 13/2906 using block codes H03M13/2957 takes precedence
• CPC Class Codes: H03M 13/2936 comprising an outer Reed-Solomon code and an inner convolutional code
• CPC Class Codes: H03M 13/6538 ATSC VBS systems
• 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 25/0212 of impulse response
• CPC Class Codes: H04L 25/0232 by interpolation between sounding signals
• CPC Class Codes: H04L 25/03159 operating in the frequency domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04N 19/89 involving methods or arrangements for detection of transmission errors at the decoder
• CPC Class Codes: H04N 19/895 in combination with error concealment
• CPC Class Codes: H04N 21/236 Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream multiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• 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 21/631 Multimode Transmission, e.g. transmitting basic layers and enhancement layers of the content over different transmission paths or transmitting with different error corrections, different keys or with different transmission protocols
• CPC Class Codes: H04N 5/21 Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
• CPC Class Codes: H04N 5/38 Transmitter circuitry for the transmission of television signals according to analogue transmission standards H04N5/14 takes precedence
• CPC Class Codes: H04N 5/40 Modulation circuits
• CPC Class Codes: H04N 5/455 Demodulation-circuits
• CPC Class Codes: H04N 7/12 Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal H04N7/24 takes precedence

Abstract

A channel equalizer includes a first transformer, an estimator, an average calculator, a second transformer, a coefficient calculator, a compensator, and a third transformer. The first transformer converts normal data into frequency domain data, where a known data sequence is periodically repeated in the normal data. The estimator estimates channel impulse responses (CIR) during known data intervals adjacent to each normal data block. The average calculator calculates an average value of the CIRs. The second transformer converts the average value into frequency domain data. The coefficient calculator calculates equalization coefficients using the average value, and the compensator compensates channel distortion of each normal data block using the coefficients. The third transformer converts the compensated data block into time domain data.

Claims

1. A method of processing broadcast data in a broadcast transmitting system, the method comprising:

first encoding enhanced data;

second encoding signaling data;

first multiplexing enhanced data packets that include the first-encoded enhanced data and the second-encoded signaling data with main data packets that include main data;

interleaving data of the first-multiplexed data packets to output a data group;

Reed-Solomon (RS) encoding data in the data group;

trellis encoding the RS-encoded data in a trellis encoding unit;

second multiplexing the trellis-encoded data with synchronization data; and

transmitting a broadcast signal including the second-multiplexed data,

wherein the signaling data include information related to the data group,

wherein the data group includes first segments, second segments and third segments, the second segments being positioned between the first and third segments, the first segments having enhanced data and main data, the second segments having enhanced data and a plurality of known data sequences, and the third segments having enhanced data and main data, and

wherein RS encoding data in the data group comprises RS encoding the enhanced data in the first, second and third segments by a non-systematic RS encoding scheme and RS encoding the main data in the first and third segments by a systematic RS encoding scheme.

2. The method of claim 1, further comprising:

initializing at least one memory included in the trellis encoding unit at each start of the plurality of known data sequences.

3. A broadcast transmitting system for processing broadcast data, the broadcast transmitting system comprising:

a first encoding unit for first encoding enhanced data;

a second encoding unit for second encoding signaling data;

a first multiplexer for first multiplexing enhanced data packets that include the first-encoded enhanced data and the second-encoded signaling data with main data packets that include main data;

an interleaver for interleaving data of the first-multiplexed data packets to output a data group;

a Reed-Solomon (RS) encoding unit for RS encoding data in the data group;

a trellis encoding unit for trellis encoding the RS-encoded data;

a second multiplexer for second multiplexing the trellis-encoded data with synchronization data; and

a transmission unit for transmitting a broadcast signal including the second-multiplexed data,

wherein the signaling data include information related to the data group;

wherein the data group includes first segments, second segments and third segments, the second segments being positioned between the first and third segments, the first segments having enhanced data and main data, the second segments having enhanced data and a plurality of known data sequences, and the third segments having enhanced data and main data, and

wherein the RS encoding unit RS encodes the enhanced data in the first, second and third segments by a non-systematic RS encoding scheme and RS encodes the main data in the first and third segments by a systematic RS encoding scheme.

4. The broadcast transmitting system of claim 3, wherein at least one memory included in the trellis encoding unit is initialized at each start of the plurality of known data sequences.