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

• US 10,277,255 B2
• Filed: 09/24/2015
• Issued: 04/30/2019
• Est. Priority Date: 02/10/2006
• Status: Active Grant

• 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): Edouard, Patrick N
• Assistant Examiner(s): Hughes, Eboni N
• Application Number:
  US14/864,490
• Publication Number:
  US 20160020788A1
• Time in Patent Office: 1,314 Days
• 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 a broadcast signal in a broadcast receiving system, the method comprising:

receiving the broadcast signal comprising service data for a service, known data that is known to the broadcast receiving system, first signaling information, and second signaling information, wherein the first signaling information includes channel information of the service, wherein the second signaling information includes information for acquisition of the service, wherein information for acquisition of the first signaling information is fixed, wherein information for acquisition of the second signaling information is variable, and wherein the service data are delivered using a specific protocol;

demodulating the received broadcast signal;

equalizing the demodulated broadcast signal by performing channel estimation based on the known data;

decoding the service data in the equalized broadcast signal for forward error correction; and

providing the service of the decoded service data based on at least one of the first signaling information or the second signaling information in the broadcast signal.

2. The method of claim 1, further comprising:

storing at least one of the first signaling information or the second signaling information into a channel map.

3. The method of claim 2, further comprising:

updating the channel map based on at least one of the first signaling information or the second signaling information.

4. A broadcast receiving system for processing a broadcast signal, the broadcast receiving system comprising:

a tuner to receive the broadcast signal comprising service data for a service, known data that is known to the broadcast receiving system, first signaling information, and second signaling information, wherein the first signaling information includes channel information of the service, wherein the second signaling information includes information for acquisition of the service, wherein information for acquisition of the first signaling information is fixed, wherein information for acquisition of the second signaling information is variable, and wherein the service data are delivered using a specific protocol;

a demodulator to demodulate the received broadcast signal;

an equalizer to equalize the demodulated broadcast signal by performing channel estimation based on the known data;

a decoder to decode the service data in the equalized broadcast signal for forward error correction; and

a manager to provide the service of the decoded service data based on at least one of the first signaling information or the second signaling information in the broadcast signal.

5. The broadcast receiving system of claim 4, wherein the manager stores at least one of the first signaling information or the second signaling information into a channel map.

6. The broadcast receiving system of claim 5, wherein the manager updates the channel map based on at least one of the first signaling information or the second signaling information.