KR100708471B1 - Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof - Google Patents

Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof Download PDF

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Publication number
KR100708471B1
KR100708471B1 KR1020050039309A KR20050039309A KR100708471B1 KR 100708471 B1 KR100708471 B1 KR 100708471B1 KR 1020050039309 A KR1020050039309 A KR 1020050039309A KR 20050039309 A KR20050039309 A KR 20050039309A KR 100708471 B1 KR100708471 B1 KR 100708471B1
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South Korea
Prior art keywords
data
step
output
rs
known
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KR1020050039309A
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Korean (ko)
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KR20050109052A (en
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김준수
장용덕
정해주
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삼성전자주식회사
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Priority to KR1020050039309A priority Critical patent/KR100708471B1/en
Priority claimed from CN2005800153877A external-priority patent/CN1954605B/en
Priority claimed from CN 200910168919 external-priority patent/CN101699848B/en
Priority claimed from CA 2565284 external-priority patent/CA2565284C/en
Publication of KR20050109052A publication Critical patent/KR20050109052A/en
Publication of KR100708471B1 publication Critical patent/KR100708471B1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/434Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4346Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream involving stuffing data, e.g. packets or bytes
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/11Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/25Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
    • H03M13/256Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM] with trellis coding, e.g. with convolutional codes and TCM
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/27Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques

Abstract

The digital broadcasting transmitter according to the present invention receives a normal data packet and a low data packet each having a stuff byte inserted at a predetermined position, and inserts the low data packet between the normal data packets at predetermined intervals to generate a dual TS stream. A TS stream generation unit, a randomization unit for randomizing the TS stream output from the TS stream generation unit, a stuff byte exchange unit for replacing the stuff byte with known data for the data output from the randomization unit, and a stuff byte exchange unit A first RS encoder that performs RS encoding on data, an interleaver that performs interleaving on data output from the first RS encoding unit, a symbol processor that performs coding on the boost data among data output from the interleaving unit, and a symbol First diin performing deinterleaving on data output from the processor And a trellis encoding unit for initializing the memory at the starting point of the data output from the deinterleaver and the trellis encoding of the data output from the deinterleaver. Digital broadcast reception performance can be improved in a poor multipath channel.
ATSC VSB, Dual Stream, Stuff Byte, Known Data, Robust Data

Description

Digital broadcasting transmission / reception devices capable of improving a receiving performance and signal processing method

1 is a block diagram showing a transmitter of a typical US digital broadcasting (ATSC VSB) system,

2 is a diagram illustrating a format of ATSC VSB data;

3 is a frame structure diagram of a TS packet;

4 is a frame structure diagram of a TS packet including a stuff byte according to the present invention;

5 is a block diagram showing a digital broadcast transmitter according to the present invention;

6 is a diagram illustrating a format of data output from the randomization unit of FIG. 5;

7 is a diagram illustrating a format of data output from the interleaver of FIG. 5;

8 is a diagram illustrating a format of data output from the trellis encoder of FIG. 5;

9 is a diagram illustrating a format of data in which parity is reconstructed according to the trellis initialization of FIG. 5;

10 is a block diagram showing a digital broadcast receiver according to the present invention; and

FIG. 11 is a view provided to explain the known data output unit of FIG. 10.

Explanation of symbols on the main parts of the drawings

100: low boost data preprocessor 110: first multiplexer

120: randomization unit 130: stuff byte exchange unit

140: first RS encoder 150: first interleaver

160: symbol processor 170: control signal generation unit

180: deinterleaver 190: RS parity removal unit

210: third RS encoder 220: reinterleaver

230: Trellis encoder 240: RS output buffer

250: parity reconstruction unit 510: demodulation unit

520: Equalizer 530: Viterbit decoder

540: deinterleaver 550: RS decoder

560 reverse randomization 570 demultiplexer

580: control signal generation unit 590: low boost data processing unit

600: known data output unit

The present invention relates to a digital broadcast transceiver, and more particularly, in a digital broadcast transmitter that transmits dual streams, it is possible to improve performance of a reception system by transmitting stuff bytes inserted into normal data as predefined known data. The present invention relates to a digital broadcast transmitter, a signal processing method thereof, a digital broadcast receiver corresponding thereto, and a signal processing method thereof.

ATSC VSB, a terrestrial digital broadcasting system for the United States, is a single carrier system and field sync signals are used in units of 312 segments. This results in poor reception, especially on poor channels, especially the Doppler fading channel.

1 is a block diagram showing a transmitter of a typical US terrestrial digital broadcasting system. The digital broadcast transmitter of FIG. 1 is a system configured to transmit and form a dual stream in which robust data is added to normal data of an existing ATSC VSB system, and is an EVBS system "ATSC. Digital Television Standard (A / 53B) ".

As shown in FIG. 1, in the digital broadcast transmitter, robust data is processed by the robust data processor 11, and the robust data processor 11 includes an RS encoder 11-1 and a data interleaver 11-2. ) And a packet formatter 11-3. The packet formatter 11-3 includes a PID inserter (not shown) and a duplexer (1/2, or 1/4 rate duplicator) (not shown). The boost data processed by the low data processor 11 is multiplexed with the normal data by the multiplexer (MUX) 12.

Data output from the multiplexer 12 is randomized through a randomizer 13 and then RS encoder 14 in the form of a concatenated code to correct an error caused by a channel. Pass through the interleaver 15. In addition, the low boost data is deinterleaved by the deinterleaver 17 before performing enhanced coding through the symbol processor 16 and reconfiguring RS parity for compatibility with an existing system. RS parity is removed through 18). Data from which the RS parity has been removed is input to the VSB transmitter 19. The VSB transmitter 19 includes an RS encoder 19-1, a data interleaver 19-2, a trellis encoder 19-3, and a multiplexer 19-4 according to a general VSB transmitter structure, and RS encoding. In this case, data interleaving, trellis encoding (12 Trellis interleaved encoding), synchronization signal and pilot insertion, and VSB modulation (VSB modulation, up-convertor) are performed.

The general digital broadcasting transmitter is a dual stream method for transmitting normal data and low boost data through one channel, and performs a pre-processing operation of the low data by the low data processor. Is performed by a packet formatter 11-3 having an RS encoder 11-1, an interleaver 11-2, a PID inserter (not shown), and a duplexer (not shown) to perform MPEG-2 TS streams. Will generate

Robust data preprocessed by the low data processor 11 is multiplexed with the normal data by the multiplexer (MUX) 12, and randomized by the randomization unit 13, and the randomized data is output to the external encoder ( Data encoded and encoded by the RS encoder 14, which is an outer coder, and the encoded data is distributed by the interleaver 15. Also, the boost data is encoded by the symbol processor 16, and the deinterleaver performs symbol-to-byte conversion and data deinterleaving for compatibility with the existing system. (17) and the RS parity removal unit 18.

Subsequently, processes such as RS encoding, data interleaving, trellis encoding, synchronization signal and pilot insertion, and VSB modulation, which are processes performed in the existing VSB transmitter, are performed.

2 shows a data format of data output from the multiplexer 12. Referring to FIG. 2, normal data and low boost data are arranged at regular intervals, which is a data format for distributing normal signals and low boost signals at uniform intervals after trellis encoding.

The terrestrial digital TV system of FIG. 1 is configured to transmit dual streams by adding low data to normal data of the conventional ATSC VSB system, and transmits the low data to the normal data.

However, the U.S. terrestrial digital TV system of FIG. 1 has little problem of improving the poor transmission performance in the multipath channel according to the conventional normal data stream transmission despite the dual stream transmission due to the addition of the boost data. have.

Accordingly, an object of the present invention is to provide a digital broadcast transmitter and a signal processing method thereof capable of improving the performance of a reception system by replacing and transmitting stuff bytes inserted into a dual stream with known data to improve reception performance. There is provided a corresponding digital broadcast receiver and a signal processing method thereof.

According to an embodiment of the present invention, a digital broadcast transmitter according to the present invention receives a normal data packet and a boost data packet into which a stuff byte is inserted at a predetermined position and receives the low data packets at predetermined intervals. A TS stream generator for generating dual TS streams of a predetermined format by interposed between the normal data packets, a randomizer for randomizing the TS stream output from the TS stream generator, and data output from the randomizer. A stuff byte exchanger for replacing the stuff byte with predetermined known data, a first RS encoder for performing RS encoding on the data output from the stuff byte exchanger, and data output from the first RS encoder An interleaver for interleaving the data; the low boost of data output from the interleaving unit Initializes a memory at a start point of the symbol processor for coding data, a first deinterleaver for deinterleaving data output from the symbol processor, and the known data among the data output from the deinterleaver; And a trellis encoding unit that performs trellis encoding.

Preferably, the known data has a predetermined predetermined pattern.

The apparatus may further include a second deinterleaver for performing deinterleaving on the data output from the symbol processor, and a parity removal unit for removing RS parity on the data output from the second deinterleaver.

More preferably, the apparatus further includes a third RS encoder performing RS encoding on the data output from the parity removing unit, and a reinterleaver performing interleaving on the data output from the third RS encoder.

In addition, it is preferable to further include an RS output buffer for temporarily storing the known data from the start point of the data output from the third RS encoder.

The RS output buffer preferably receives the known data changed according to the memory initialization from the trellis encoder.

In addition, the parity reconstruction unit receives the changed known data from the RS output buffer and performs RS encoding to generate a changed parity, outputs the trellis encoding unit, and replaces the parity added by the third RS encoder. It is preferable to further include.

Preferably, the stuff byte is inserted into an adaptation field of the normal data packet and the low data packet.

The normal data packet and the low data packet are preferably inserted with information about the length of the stuff byte inserted in a predetermined position.

Meanwhile, in the signal processing method for a digital broadcast transmitter according to the present invention, the low data packet is received at a predetermined interval by receiving a normal data packet and a low data packet having a stuff byte inserted at a predetermined position. A TS stream generation step of generating a dual TS stream of a predetermined format by interposing between normal data packets, a randomization step of randomizing the TS stream generated in the TS stream generation step, and a data output in the randomization step. A stuff byte exchange step of replacing the stuff byte with predetermined known data, a first RS encoding step of performing RS encoding on the data output from the stuff byte exchange step, and an output from the first RS encoding step An interleaving step of performing interleaving on the collected data, and outputting the interleaving step A symbol processing step of performing coding on the low data among the extracted data, a first deinterleaving step of deinterleaving the data output in the symbol processing step, and a data output from the first deinterleaving step. A trellis encoding step of initializing a memory at the starting point for the known data and performing trellis encoding.

In addition, the digital broadcast receiver according to the present invention corresponding to the above digital broadcast transmitter inserts predetermined known data into the dual stream in which a stuff byte is inserted at a predetermined position. A demodulator for receiving and demodulating an encoded signal from a digital broadcast transmitter, a known data output unit for detecting a position of the known data from the demodulated signal and outputting the known data, an equalizer for equalizing the demodulated signal, and detecting A Viterbi decoder for correcting and decoding an error of the equalized signal using the known data, a deinterleaver for performing deinterleaving on the output data of the Viterbi decoder, and inverse random with respect to the output data of the deinterleaver. A derandomization unit for performing normalization, and the data output from the derandomization unit is converted into low-boost data and normal. A demultiplexer for separating a data portion and a data processing unit to boost the boost processing for reconstructing the data in the.

Preferably, the known data output unit includes a known symbol detection unit for detecting information on the predetermined position into which the known data is inserted from the received signal, and at least one segment indicating the position with a predetermined identification mark. A segment flag generator for generating a data frame, a trellis interleaver for performing an encoding operation and interleaving on the data frame, and an interleaved data frame at the position where the identification mark is displayed; It includes a known data extraction unit for inserting and outputting known data.

The known data output unit may output the detected known data to the demodulator, and the demodulator performs the demodulation using the known data.

On the other hand, in the signal processing method for a digital broadcast receiver according to the present invention, a dual stream having a stuff byte inserted into a predetermined position is encoded by inserting predetermined known data into the position. A demodulation step of receiving and demodulating a signal from a digital broadcast transmitter, a known data output step of detecting a position of the known data from the demodulated signal and outputting the known data, an equalization step of equalizing the demodulated signal, and detecting the detected signal Decoding step of correcting and decoding an error of the equalized signal using known data, Deinterleaving step of performing deinterleaving on the output data of the decoding step, and inverse randomization of the output data of the deinterleaving step The derandomization step performed by the derandomization step, the data output in the derandomization step and the low boost data And a demultiplexing step of separating the data into remote data, and a low data processing step of processing and reconstructing the low data.

Preferably, the step of outputting the known data comprises: detecting information on the predetermined position at which the known data is inserted from a received signal, the at least one segment indicating the position by a predetermined identification mark; Generating a data frame, performing an encoding operation and interleaving performed by the digital broadcast transmitter on the data frame, and inserting and outputting the known data at the position where the identification mark is displayed among the interleaved data frames. It includes a step.

In the outputting of the known data, the detected known data may be output to the demodulator, and the demodulator may perform the demodulation using the known data.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

5 is a block diagram illustrating a digital broadcast transmitter according to the present invention. The digital broadcast transmitter of FIG. 5 is a structure complementing the EVSB system proposed by LG (Zenith) / ATI, and adds a stuff byte to an MPEG-2 packet of normal data, and adds the added stuff byte. When transmission is replaced by known data from the digital broadcast transmitter, the corresponding digital broadcast receiver is configured to detect such known data and use it to compensate for the distortion caused by the channel.

Referring to FIG. 5, the digital broadcast transmitter comprises: a first multiplexer 110 multiplexing the normal data and the boost data output from the low data preprocessing unit 100, a randomizer 120 randomizing the multiplexed data; A channel for the data output from the stuff byte exchanger 130 and the stuff byte exchanger 130 which replaces the stuff byte inserted in the normal data and the low boost data with a specific sequence among the randomized data. The first RS encoder 140 configured in the form of a concatenated code, the first interleaver 150 performing data interleaving, and a low boost among interleaved data to correct an error caused by The symbol processor 150, the symbol processor 160, the control signal generator 170, and the encoded (enhanced coded) data, which perform enhanced coding on the data, are existing. In order to be compatible with the system, a deinterleaver (De-interleaver) 180 for deinterleaving and an RS parity byte delete unit (190) for removing RS parity are included. Such a digital broadcast transmitter is configured to be compatible with an existing system as an EVSB system.

 In addition, the digital broadcast transmitter of FIG. 5 includes a third RS encoder 210 that performs VSB transmission channel coding, a reinterleaver 220 that performs data interleaving again, and a 2/3 rate trellis encoding. It includes a trellis encoder 230 for performing (). The trellis encoder 230 performs trellis encoding and performs a process for initializing a stuff byte.

The low data preprocessing unit 100 includes a second RS encoder 101 for performing RS encoding on a low boost stream, a second interleaver 103 for interleaving an RS encoded low boost stream, and an interleaved low boost. And a packet formatter 305 for formatting the stream according to a predetermined format.

That is, the Robust data preprocessor 100 processes the Robust data by inserting a PID through the packet formatter 305 and duplicated the duplicated RS encoded Robust stream through the packet formatter 305, and the normal MPEG packet. Robust MPEG packets formatted for insertion at predetermined intervals are output.

Meanwhile, in the present invention, the normal data packet and the low data packet input to the first multiplexer 110 may have a stuff byte inserted therein. 3 is a frame structure diagram of a general TS stream packet, and FIG. 4 is a frame structure diagram of an MPEG-2 TS stream packet including an adaptation field in which a stuff byte is added according to the present invention.

In FIG. 4, a 188-byte MPEG-2 packet includes a 4-byte information signal (MPEG-2 Header) including an MPEG sync signal, adaptation field length information of 1 byte, and 1-byte other. Information, transform field data with n stuff bytes, and " 188- (4 + 2 + n) " ES data.

A general TS stream packet frame is composed of an MPEG-2 header and a modified field or ES data as shown in FIG. As shown in FIG. 4, the normal data packet and the low data packet according to the present invention insert a stuff byte into a modification field to configure a TS stream including a modification field. MPEG-2 TS packets configured in this manner are input to the first multiplexer 110, respectively.

The first multiplexer 110 multiplexes the normal data having the shape as described above and the low boost data output from the low data preprocessing unit 100, and the randomization unit 120 randomizes the multiplexed data.

The stuff byte exchange unit 130 is a random sequence of stuff bytes inserted into the normal data and the boot data from the randomized data, for example, into a specific sequence generated by a specific sequence generator (not shown). Replace it and print it out. The specific sequence is data having a predefined pattern known in advance between the transmitter and the receiver, hereinafter referred to as known data.

FIG. 6 shows a data format after replacing n stuff byte parts with specific sequence data with respect to the normal data packet and the low data packet in the randomization unit 120 output. Referring to the figure, normal data and a low data packet appear at predetermined intervals, and known data is inserted in the modified fields of the normal data packet and the low data packet instead of the stuff byte.

In addition, as described above, the header of the MPEG-2 packet data output from the randomization unit 120 is composed of three bytes including a first byte as a synchronization signal and a packet identity (PID), and then a modified field composed of predetermined bytes. The first two bytes of the portion contain the adaptation field length information. That is, the first two bytes of the transform field contain information about the stuff byte, i.e., the length of known data, inserted into the transform field. Since the start position of the known data in the packet is fixed, the receiver can know the position of the known data and its length, that is, the amount, according to the information inserted in the first two bytes of the modified field.

The first RS encoder 140 performs encoding on the data output from the stuff byte exchange unit 130 and externally encodes it in the form of a concatenated code to correct an error generated by the channel. .

The first interleaver 150 performs data interleaving on the data output from the first RS encoder 140, and the symbol processor 160 performs enhanced coding on the low boost data among the interleaved data. do. In order to be compatible with an existing system, the deinterleaver 180 performs deinterleaving, and the RS parity removing unit 190 removes parity with respect to coded data.

 7 illustrates a data format after data interleaving by the first interleaver 150. The MPEG-2 packet of FIG. 6 is distributed in 52 units by the first interleaver 150 as shown in FIG. 7. Here, the data of the same byte position of the MPEG-2 packet constitutes the same column as shown in FIG. 7 after data interleaving. In addition, the data format output from the trellis encoder 230 after its output is 12 symbols interleaved as shown in FIG. That is, it can be seen that data at the same byte position in MPEG-2 packets constitutes almost one data segment as shown in FIG. 8 after trellis encoding. Therefore, after adding and randomizing stuff bytes to a certain part of an MPEG-2 packet, replacing them with a specific sequence, and performing trellis encoding, stuff bytes inserted at the same byte position are one data segment. This is known as a known signal (Known signal) can be used to improve the reception performance by detecting it in the digital broadcast receiver.

The control signal generation unit 170 detects the modified field length information, and generates and outputs a flag signal indicating the position of the stuff byte or the known symbol sequence data.

In addition, RS encoding is performed by the third RS encoder 210 to perform VSB transmission channel coding, data interleaving is performed again by the reinterleaver 220, and 2 / by the trellis encoder 230. 3/3 trellis encoding is performed.

The RS output buffer 240 and the parity reconstruction unit 250 reconfigure the parity for the known data changed according to the initialization in the process of initializing the known data in the trellis encoder 230, and the trellis encoder 230. Performs VSB transmission channel coding together.

The RS output buffer 240 temporarily outputs the known data from the start point of the RS parity-removed data output from the RS parity removing unit 190 and temporarily stores the known data according to the initialization in the trellis encoder 230. Is trellis-encoded, receives the known data changed according to the initialization from the trellis encoder 230, replaces the previously known data stored temporarily, stores the changed known data, and converts the changed known data into parity regeneration. To the parity reconstruction unit 250.

The parity reconstruction unit 250 receives the known data changed according to the initialization and regenerates the parity according to the changed data and inputs it to the trellis encoder 230 to replace the existing parity with the newly generated parity.

The trellis encoder 230 converts the data output from the reinterleaver 220 into symbols and performs symbol mapping through trellis coding at a 2/3 ratio. In addition, as described above, the trellis encoder 230 performs initialization of 12 trellis encoders at the starting point of known data, that is, a known symbol sequence starting point. To make it "00". The trellis encoder 230 initializes values temporarily stored in its own memory device at the start of the known data and performs trellis encoding on the known data.

Accordingly, the data packet output from the trellis encoder 230 to the multiplexer 260 includes changed known data according to memory element initialization of the trellis encoder 230 and parity according to RS encoding for the changed known data. Has an added data format.

 FIG. 8 is a data format for the output of the 12 symbol interleaved trellis encoder 230. Since one field includes six convolutional interleavers, six sequences including stuff bytes are shown. That is, when 10-bit stuff bytes are included in a TS stream, a sequence of "10 * 6 = 60" known symbols appears in one field.

FIG. 9 illustrates a data format after RS re-encoding and parity reconstruction are performed by the parity reconstruction unit 250 of FIG. 5. That is, when the trellis encoder 230 is initialized at the start of the sequence of known symbols, the parity reconstruction unit 250 changes the output parity of the third RS encoder 210 according to the initialization value, thereby changing it. Parity is input to trellis encoder 230. Subsequently, the trellis encoder 230 updates the changed parity to perform trellis encoding, so that there is no problem in decoding the RS decoder of the digital broadcast receiver to be described later.

That is, the initialization of the trellis encoder 230 is performed to make the trellis-encoded data form a specific sequence during the known symbol sequence period, and to change the RS parity corresponding to the known symbol sequence changed according to the initialization. RS encoding for the changed known symbol sequence is again performed to change the parity, which replaces the original parity, and FIG. 9 shows this data format.

The data encoded through the trellis encoder 230, the RS output buffer 240, and the parity reconstruction unit 250 and mapped to symbols are stored by the second multiplexer 260 as shown in the data formats of FIGS. 2 and 9. The field sync signal and the segment sync signal are inserted. In addition, the transmitter transmits a DC offset to generate a VSB for pilot generation, converts it to RF, and transmits the converted RF.

FIG. 10 is a block diagram of a digital broadcast receiver according to the present invention corresponding to the digital broadcast transmitter of FIG. 5, and if the received signal includes normal, robust and stuff bytes, it is decoded. Includes components for

The digital broadcast receiver of FIG. 10 includes a demodulator 510 for lowering an RF signal to a baseband and demodulating it, an equalizer 520 for removing inter-symbol interference, a Viterbi decoder or trellis decoder 530, and a deinterleaver ( 540, RS decoder 550, derandom equalizer 560, demultiplexer 570 for separating normal data and low boost data, control signal generator 580 for generating control signals for controlling dual streams, The low data processing unit 590 and a known data output unit 600 for detecting the position of the stuff byte and outputting known data are included.

Here, the Viterbi decoder 530, the deinterleaver 540, the RS decoder 550, and the derandom equalizer 560 perform error correction and decoding from the equalized signal.

The demodulator 510 converts an RF signal received through a channel into a baseband signal through a tuner / IF (not shown), and performs synchronization detection and demodulation on the converted baseband signal. The equalizer 520 compensates for channel distortion due to the multipath of the channel from the demodulated signal.

On the other hand, the known data output unit 600 detects the length information of the stuff byte inserted in the reserved part of the field sync data segment section or the first two bytes of the modified field to locate the known symbol. Obtain the information and output the known data from the obtained location information.

11 shows a known data output unit 600 for detecting known data in a digital broadcast receiver.

The known data output unit 600 includes a known symbol detector 610, a segment flag generator 620, a trellis interleaver 630, and a known data extractor 640.

When the digital broadcasting transmitter inserts the amount (number) of stuff bytes into the control information bits or the reserved portion of the field sync data segment section including information on the length of the deformation field of the data header portion, the known data of the digital broadcasting receiver The known symbol detection unit 610 of the output unit 600 detects the amount information of the known data, and according to the detected amount information, the position of the known symbol by the segment flag generator 620 and the trellis interleaver 630 and The number information is found, and the known data extractor 640 outputs the known data from the obtained position and the number information, and is used to improve the reception performance of the digital broadcast receiver. Knowing the amount of stuff byte, the position of the stuff byte is always fixed, so that the segment flag generator 620 and trellis interleaver 630 may be implemented using a counter and control logic.

That is, the known symbol detection unit 610 extracts information about the position of the known data from the control information bit including information about the length of the deformation field of the demodulated data header portion. Here, the information on the location of the known data includes information on the length of the known data, and since the location of the known data is specified in advance, the length and the number of the known symbols according to the encoding of the known data can be determined by knowing the length of the known data. have.

The segment flag generating unit 620 generates at least one segment by a predetermined identification mark by a length corresponding to the number of symbols for a corresponding position according to the position and the number of the known symbols, and generates at least one segment. 2 Create a transmission frame.

The trellis interleaver 630 performs an encoding process such as an interleaving process performed by a transmitter on the transmission frame generated by the segment flag generator 620.

In addition, the known data extracting unit 640 performs encoding from the trellis interleaver 630 and inserts predetermined known data at a position corresponding to a known symbol identified according to an identification mark among the output transmission frames. Output

Meanwhile, the signal equalized by the equalizer 520 corrects an error through the Viterbi decoder 530 and is decoded into symbol data. The decoded data rearranges the data distributed by the first interleaver 150 of the transmitter of FIG. 5 through a data deinterleaver 540. The deinterleaved data is error corrected through the RS decoder 550. The control signal generator 580 generates a control signal for processing normal data and low boost data. The data corrected through the RS decoder 550 is derandomized through the derandomizer 560. The output of the derandom equalizer 560 is divided into normal data and low boost data through the demultiplexer 570, and the low boost data is processed by the low boost data processor 590.

As described above, stuff bytes are generated and inserted into MPEG-2 TS packets, and the inserted stuff bytes are transmitted from the digital broadcast transmitter as known data, and the digital broadcast receiver detects and uses known data to synchronize the digital broadcast receiver. Receive performance such as acquisition and equalization performance can be improved.

According to the present invention, a digital broadcast transmitter generates and inserts a stuff byte into an MPEG-2 TS packet, transmits the inserted stuff byte as known data, and detects and uses known data in a digital broadcast receiver, thereby providing an existing digital broadcasting system. It is compatible with, low hardware complexity, and can improve digital broadcast reception performance in poor multipath channels.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the present invention is not limited to the specific embodiments of the present invention without departing from the spirit of the present invention as claimed in the claims. Anyone skilled in the art can make various modifications, as well as such modifications are within the scope of the claims.

Claims (24)

  1. Generates a dual TS stream having a predetermined format by receiving a normal data packet and a low data packet each having a stuff byte inserted at a predetermined position, and inserting the low data packets between the normal data packets at predetermined intervals. A TS stream generator;
    A randomizer which randomizes the TS stream output from the TS stream generator;
    A stuff byte exchange unit which replaces the stuff byte with predetermined known data for data output from the randomization unit;
    A first RS encoder performing RS encoding on data output from the stuff byte exchange unit;
    An interleaver for interleaving the data output from the first RS encoder;
    A symbol processor which performs coding on the boost data among the data output from the interleaving unit;
    A first deinterleaver for performing deinterleaving on data output from the symbol processor; And
    And a trellis encoding unit for initializing a memory at the starting point of the known data among the data output from the deinterleaver and performing trellis encoding.
  2. The method of claim 1,
    And said known data has a predetermined predetermined pattern.
  3. The method of claim 1,
    A second deinterleaver for performing deinterleaving on the data output from the symbol processor; And
    And a parity removal unit for removing RS parity from the data output from the second deinterleaver.
  4. The method of claim 3,
    A third RS encoder for performing RS encoding on the data output from the parity remover; And
    And a reinterleaver for interleaving the data output from the third RS encoder.
  5. The method of claim 4, wherein
    And an RS output buffer for temporarily storing the known data from the start point among the data output from the third RS encoder.
  6. The method of claim 5,
    And the RS output buffer receives and stores the known data changed according to the memory initialization from the trellis encoder.
  7. The method of claim 6,
    A parity reconstructing unit configured to receive the changed known data from the RS output buffer and perform RS encoding to generate a changed parity, output the trellis encoding unit, and replace the parity added by the third RS encoder; Digital broadcast transmitter further comprises.
  8. The method of claim 1,
    The stuff byte is inserted into an adaptation field of the normal data packet and the low data packet.
  9. The method of claim 1,
    The normal data packet and the low data packet, digital broadcast transmitter, characterized in that the information about the length of the inserted stuff byte is inserted at a predetermined position.
  10. When receiving a normal data packet and a low data packet each having a stuff byte inserted at a predetermined position, the low data data is inserted between the normal data packets at predetermined intervals to generate a dual TS stream having a predetermined format. Generating a TS stream;
    A randomization step of randomizing the TS stream generated in the TS stream generation step;
    A stuff byte exchange step of replacing the stuff byte with predetermined known data for the data output in the randomization step;
    A first RS encoding step of performing RS encoding on the data output in the stuff byte exchange step;
    An interleaving step of performing interleaving on the data output in the first RS encoding step;
    A symbol processing step of performing coding on the low boost data among the data output in the interleaving step;
    A first deinterleaving step of performing deinterleaving on the data output in the symbol processing step; And
    A trellis encoding step of initializing a memory at a starting point of the known data among the data output in the first deinterleaving step and performing trellis encoding; and a signal for a digital broadcast transmitter. Treatment method.
  11.  The method of claim 10,
    And said known data has a predetermined predetermined pattern.
  12.  The method of claim 10,
    A deinterleaving step of performing deinterleaving on the data output in the symbol processing step; And
    And a parity removing step of removing RS parity from the data output in the deinterleaving step.
  13.  The method of claim 12,
    A third RS encoding step of performing RS encoding on the data output in the parity removing step; And
    And a reinterleaving step of performing interleaving on the data output in the third RS encoding step.
  14. The method of claim 13,
    And an RS output buffering step of temporarily receiving the known data among the data output in the third RS encoding step from a start point thereof and temporarily storing the known data.
  15. The method of claim 14,
    The RS output buffering step includes receiving and storing the known data changed according to the memory initialization from the trellis encoding step.
  16. The method of claim 15,
    Parity reconstruction that receives the changed known data from the RS output buffering step, performs RS encoding to generate a changed parity, outputs the trellis encoding step, and replaces the parity added in the third RS encoding step. Signal processing method for a digital broadcast transmitter, characterized in that it further comprises.
  17. The method of claim 10,
    The stuff byte is inserted into an adaptation field of the normal data packet and the low data packet.
  18. The method of claim 10,
    And the information on the length of the stuff byte inserted into the normal data packet and the low data packet is inserted at a predetermined position.
  19. For a dual TS stream of a predetermined format in which a normal data packet and a boost data packet each having a stuff byte inserted therein at a predetermined position are input, and the low data packet is inserted between the normal data packets at predetermined intervals. And a demodulator for inserting predetermined known data into the position and receiving and demodulating the encoded signal from the digital broadcast transmitter.
    A known data output unit for detecting a position of the known data from the demodulated signal and outputting the known data;
    An equalizer for equalizing the demodulated signal;
    A Viterbi decoder that corrects and decodes an error of the equalized signal using the detected known data;
    A deinterleaver for deinterleaving the output data of the Viterbi decoder;
    An inverse randomization unit performing inverse randomization on the output data of the deinterleaver;
    A demultiplexer for separating data output from the derandomizer into low-boost data and normal data; And
    And a boost data processor for processing and reconfiguring the boost data.
  20. The method of claim 19,
    The known data output unit,
    A known symbol detector detecting information about the predetermined position at which the known data is inserted from a received signal;
    A segment flag generator configured to generate a data frame including at least one segment indicating the position by a predetermined identification mark;
    A trellis interleaver for performing an encoding operation performed at the digital broadcast transmitter on the data frame; And
    And a known data extracting unit for inserting and outputting the known data at the position where the identification mark is displayed among the interleaved data frames.
  21. The method of claim 20,
    The known data output unit,
    Outputting the detected known data to the demodulator,
    And the demodulator performs the demodulation using the known data.
  22. For a dual TS stream of a predetermined format in which a normal data packet and a boost data packet each having a stuff byte inserted therein at a predetermined position are input, and the low data packet is inserted between the normal data packets at predetermined intervals. A demodulation step of receiving and demodulating an encoded signal by inserting predetermined known data into the position from a digital broadcasting transmitter;
    A known data output step of detecting a position of said known data from said demodulated signal and outputting said known data;
    An equalization step of equalizing the demodulated signal;
    A decoding step of correcting and decoding an error of the equalized signal using the detected known data;
    A deinterleaving step of performing deinterleaving on the output data of the decoding step;
    A derandom randomization step of performing inverse randomization on the output data of the deinterleaving step;
    A demultiplexing step of separating the data output in the derandomization step into low-boost data and normal data; And
    And a boost data processing step of processing and reconstructing the boost data.
  23. The method of claim 22,
    The known data output step,
    Detecting information on the predetermined position where the known data is inserted from the received signal;
    Generating a data frame comprising at least one segment indicative of the location with a predetermined identification mark;
    Performing an encoding operation performed at the digital broadcast transmitter on the data frame; And
    And inserting and outputting the known data at the position where the identification mark is displayed among the interleaved data frames.
  24. The method of claim 22,
    The known data output step,
    Outputting the detected known data to the demodulator,
    The demodulation unit performs the demodulation using the known data.
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CA 2565284 CA2565284C (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
CA2679043A CA2679043C (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
CA 2679040 CA2679040C (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
MXPA06013046A MXPA06013046A (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices capable of improving a receiving performance an dsignal processing method thereof.
CN2009101689171A CN101697570B (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices and signal processing method thereof
CA 2679046 CA2679046C (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
CN2005800153877A CN1954605B (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices and signal processing method thereof
PCT/KR2005/001398 WO2005120062A1 (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices capable of improving a receiving performance an dsignal processing method thereof
CN200910168916A CN101697569A (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices and signal processing method thereof
CN 200910168915 CN101699846B (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices and a signal processing method thereof
CN 200910168918 CN101699847B (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices capable of improving a receiving performance an dsignal processing method thereof
CA2679049A CA2679049C (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
US11/587,924 US8582682B2 (en) 2004-05-13 2005-05-12 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
US12/260,571 US8548080B2 (en) 2004-05-13 2008-10-29 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
US12/260,580 US8743996B2 (en) 2004-05-13 2008-10-29 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
US12/260,615 US8761313B2 (en) 2004-05-13 2008-10-29 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
US12/260,635 US8514981B2 (en) 2004-05-13 2008-10-29 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
US12/260,686 US8306158B2 (en) 2004-05-13 2008-10-29 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
US12/260,657 US8542780B2 (en) 2004-05-13 2008-10-29 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
US12/260,588 US8483303B2 (en) 2004-05-13 2008-10-29 Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof
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