KR100848909B1 - Digital broadcasting receiver and method for processing the signal - Google Patents

Abstract

The present invention relates to a digital broadcast receiver for processing packet data transmitted in various packet modes and a processing method thereof. The digital broadcast receiver configured according to the present invention includes a first data table and a second data receiver. A synchronizer configured to synchronize a data table and configure a packet related to data transmission; A storage unit configured to output an input packet related to the data transmission to an RS decoder or to receive and output an error corrected data transmission packet from the RS decoder; And an RS (Reed-Solomon) decoder for correcting an error of a packet related to the data transmission.

Therefore, according to the present invention, it is possible to process packet data transmitted in, for example, an enhanced packet mode (EPM) in addition to the existing packet mode, thereby improving the reception performance of the receiver and maintaining compatibility with the existing receiver. .

Digital Broadcast, FEC Packet, Application Data Table, RS Data Table, EPM

Description

Digital broadcasting receiver and method for processing the signal

1 illustrates an example of a structure of a digital multimedia broadcasting packet in accordance with the present invention.

2 illustrates the length of a digital multimedia broadcasting packet in accordance with the present invention.

3 illustrates an example of a buffer structure for forming an FEC packet in accordance with the present invention.

4 illustrates an example of a structure of a general FEC packet in accordance with the present invention.

5 illustrates an example of a packet structure of RS data in connection with the present invention.

6 illustrates an example of a digital broadcast receiver configured according to the present invention.

7 illustrates an example of an internal block diagram of an EPM processing unit configured according to the present invention.

8 is a block diagram illustrating an internal configuration of a synchronization unit according to the present invention.

9 is an example of a flowchart illustrating a method of processing a digital broadcast signal received according to the present invention.

* Explanation of symbols for the main parts of the drawings

600; Antenna 601; Tuner

602; AGC 603; A / D

604; A mode detector 605; I / Q distributor

606; Signal synchronizer 607; OFDM demodulator

608; Frequency deinterleaver 609; Block aggregator

610; FIC decoder 611; Time deinterleaver

612; Weaving decoder 613; Energy reverse scrambler

614; Channel distributor 2 615; Weaving deinterleaver

616; RS decoder 617; FIC data decoder

618; Audio decoder 619; Video decoder

620; An EPM processor 621; Data decoder

701; A synchronization unit 702; Storage

703; RS decoder 704; Restoration department

The present invention relates to a digital broadcast receiver and a processing method thereof.

Digitalization of broadcasting has influenced existing analog radio broadcasting, which has led to the advent of digital radio broadcasting, and has enabled digital multimedia broadcasting by including data transmission and multimedia services in existing voice radio service.

The digital multimedia broadcasting is more robust to noise and distortion on a transmission channel than conventional analog broadcasting, and has a high transmission efficiency as well as various multimedia services.

Such digital multimedia broadcasting is based on Eureka-147 digital audio broadcasting, which is basically adopted as the European terrestrial radio standard, and burst error that can occur on a transmission channel to improve multimedia broadcasting performance. We added robust RS code (Reed-Solomon code) and convolutional interleaver.

The transmission channel of the digital multimedia broadcasting is a wireless mobile reception channel, and the amplitude of the received signal is time-varying and the Doppler spreading of the received signal spectrum may occur due to the movement reception. .

Accordingly, digital multimedia broadcasting adopts orthogonal frequency division multiplexing (OFDM) based transmission scheme in consideration of transmission and reception in the above channel environment, and interleaving of signals in time and frequency domains. By doing this, it is possible to correct an error that may occur on the transmission channel.

In the digital multimedia broadcasting, the transmitter transmits a signal having a much smaller signal strength than the conventional analog audio broadcasting signal. In addition, the receiving end may receive a signal of a smaller intensity compared to the transmission signal of a very small intensity of the transmitting end due to mobile reception and severe fading channel environment such as downtown.

Therefore, the digital broadcast receiver should be able to receive the transmission signal of the transmitter as much as possible and correct the transmission error occurring in the transmission process even in such a poor reception environment.

In this regard, the transmitting end may transmit a signal in enhanced packet mode (EPM) to further improve the receiving performance at the receiving end than the conventional packet mode.

Therefore, the receiving end should be able to process this when the transmitting end transmits to the EPM. However, in the case of the existing receiver, as described above, even when the transmitter transmits to the EPM, it can be processed like the existing packet mode, but there is a problem in that the EPM decoding cannot be performed.

Accordingly, in order to solve the above problems, the present invention transmits in enhanced packet mode (EPM) at the transmitting end to improve the reception performance of packet data while ensuring backward compatibility with existing receivers. It is an object of the present invention to provide a digital broadcast receiver capable of receiving and processing the same and a processing method thereof.

Hereinafter, in order to achieve the above object, an example of a digital broadcasting receiver configured according to the present invention is synchronizing a packet related to data transmission by synchronizing a first data table with a second data table. part; A storage unit configured to output an input packet related to the data transmission to an RS decoder or to receive and output an error corrected data transmission packet from the RS decoder; And an RS decoder which corrects an error of a packet related to the data transmission.
In this case, the synchronization unit processes the case of knowing the start point of the byte unit for the input packet data and the case of not knowing, but if the start point is known, the packet data inputted into the byte unit by making the input bit into a byte unit If you do not know, you can monitor the incoming packet data in order of two bytes.
If the synchronization unit receives the header of the first packet constituting the packet related to packet data transmission as a result of the monitoring, the synchronization unit may generate a synchronization signal and a confidence coefficient and predict the position of the header of the next packet.
In addition, the synchronization unit compares the header values of the packets actually input and the header values of the expected packets at the header positions of the next packets expected from the header of the received first packet, but if the two header values match as a result of the comparison, the synchronization occurs. Can increase the confidence factor.
If the two header values do not coincide as a result of the comparison, the synchronization unit may reduce a previously generated confidence coefficient.
The synchronization unit may output packet data by maintaining the pre-generated synchronization signal when the increase or decrease of the confidence coefficient exceeds a predetermined value. It may be determined whether the first packet header is received.
The storage unit may include: a first storage unit for receiving and temporarily storing synchronized packet data and outputting the packet data to an RS decoder; And a second storage unit for receiving and temporarily storing the received packet data in the process of receiving and outputting error corrected packet data from the RS decoder in the first storage unit, and outputting the packet data to the RS decoder.
The first storage unit and the second storage unit may read the received packet data in units of rows and output the received packet data to the RS decoder. The packet data received by error correction by the RS decoder may be read in columns.
The RS decoder calculates a syntax when the packet data is received, outputs a false value, estimates an error value and an error position from the output false value, and synchronizes with the calculated value after passing the FIFO. By using the estimated error position and the error value, error correction may be output to the storage unit again.
The apparatus may further include a restoration unit for restoring header information of parity of the first data table.

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According to an exemplary embodiment of the present invention, a method of receiving and processing a digital broadcast signal may include synchronizing a first data table using a header of a packet, and synchronizing a second data table using the first data table. Constructing a packet associated with data transmission; Correcting an error of a packet related to the configured packet data transmission; And outputting a packet related to the error corrected packet data transmission.
At this time, the step of configuring the packet is processed by distinguishing the case of knowing the starting point of the unit of the input packet data with the case of not knowing, but if the starting point is known, the input bit is made into bytes and the unit of two bytes from the starting point Incoming packet data can be monitored and, if not known, the incoming packet data can be monitored in two-byte units in order.
When the monitoring results, when the header of the first packet constituting the packet related to the packet data transmission is received, it generates a synchronization signal and a confidence coefficient, predicts the position of the header of the next packet, and actually inputs the header position of the predicted next packet. When the header values of the packets are identical to the header values of the predicted packets, the generated confidence coefficient may be increased.
In addition, if the header values of the predicted packets do not match, the previously generated confidence coefficient may be reduced.
If the increase or decrease of the confidence coefficient exceeds the predetermined value, the packet data is output by maintaining the generated synchronization signal. If the predetermined confidence value is less than the predetermined value, the previously generated synchronization signal is solved and the first packet header is received again. Can be determined.
In the error correcting step, error correction may be performed by reading data related to the configured packet data transmission in units of rows.
The method may further include restoring header information of parity of the first data table.

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The first data table may be an RS data table, and the second data table may be an application data table.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings. In addition, the terminology used in the present invention was selected as a general term widely used as possible now. However, in certain cases, the applicant arbitrarily selected a term, and in this case, the meaning is described in detail in the corresponding part. Therefore, the terms used in the present invention should be understood as meanings of the terms rather than simply names of the terms.

Hereinafter, a digital broadcast receiver capable of processing data transmitted in an enhanced packet mode (EPM) and a processing process of the receiver will be described with reference to the accompanying drawings.

Digital multimedia broadcasting is a stream of data, which is a stream of data, and a packet mode that transmits data by dividing the data into individual packet units. There are two transmission modes. In this case, the transmitting end may use the EPM to improve the performance in transmitting the packet data in relation to the packet mode of the two transmission modes.

Accordingly, the present invention provides an apparatus and method capable of processing packet data transmitted to the EPM while maintaining backward compatibility with an existing receiver when transmitting data in a packet mode or an EPM. I would like to.

Before describing the digital broadcast receiver and its processing method according to the present invention, the EPM will be described.

1 illustrates an example of a structure of a digital multimedia broadcasting packet in connection with the present invention, and FIG. 2 illustrates a length of a digital multimedia broadcasting packet in relation to the present invention.

Referring to FIG. 1, the basic structure of a digital multimedia broadcasting packet can be seen that the packet consists of a packet header, a packet data field, and a packet cyclic redundancy check (CRC).

First, a packet header is a 2-bit packet length field indicating the length of each packet in units of bytes by multiples of 24, as shown in FIG. 2, and the same service component regardless of the length of each packet. A 2-bit continuity index field that provides a link between successive packets carrying a single packet, first / last with 2 bits as a flag used to define special packets that form a sequence of packets. Field, a 10-bit address field that defines packets carrying individual service components within a sub-channel, whether the packet is used for general data or for a specific command. 7-bit to express the length in bytes associated with the 1-bit command field and the available data field, which is a flag to indicate It includes the useful data length field.

Next, the packet data field combines the data field containing the available service component data and the bytes required to complete the packet data field according to the given number of bytes. It includes a padding field.

Finally, a packet CRC is a 16-bit CRC word calculated on the packet header and packet data fields.

As shown in the above-described packet structure, each packet has a CRC parity at the end, so that an error occurs through a CRC decoding process at the receiver, so that a broken packet may be discarded.

The transmitting end transmits the packets configured as described above only in the packet mode. However, as described above, the transmitting end can also transmit the EPM, which is a transmission mode with better reception performance than the packet mode. Must be able to process the packet data.

The EPM improves reception performance by adding an RS encoding process to existing packet data through a virtual block interleaving process. Hereinafter, in the present specification, the virtual block interleaving means that the actual packet data is transmitted in units of columns at the transmitting end, but RS encoding is performed in units of rows. In other words, the packet data is the same in the input and output of the transmitting end without any order change compared to the existing packet mode, but the RS coding is called virtual block interleaving because it is performed in units of rows.

The transmitting end may transmit the packet data in the existing packet mode but not necessarily in the EPM.

However, in the case of the existing receiver, when the transmitting end transmits to the EPM, the part related to the EPM is treated as a CRC error, and even though the transmitting end transmits packet data to the EPM to improve the receiving end, it is the same as the existing packet mode. As a result, performance improvement over packet mode cannot be expected.

Hereinafter, a case in which data is transmitted from the transmitting end to the EPM will be described. FIG. 3 illustrates an example of a buffer structure for forming a forward error correction (FEC) packet in connection with the present invention, and FIG. 4 illustrates an example of a structure of a general FEC packet in connection with the present invention. 5 shows an example of a packet structure of RS data in connection with the present invention.

First, the transmitting end stores the input packet data in a column by column in the buffer of FIG. 3 in order. At this time, the buffer has a size of 12x204 bytes, and packet data is stored up to column 188 of column 204 of the buffer.

When the input packet data is stored up to column 188 of the buffer, the transmitter encodes the stored packet data in row by row.

Accordingly, due to the RS encoding, the buffer stores packet data pre-stored in units of rows in the buffers of columns 189 through 204 other than columns 188 in which packet data is stored in rows, that is, packet data in rows of 188 bytes. Creates 16 bytes of RS parity. In this case, the transmitting end uses the same RS code as the (204, 188) RS code used when encoding video data in the existing digital multimedia broadcasting.

That is, in the same manner as described above, the transmitting end stores packet data input in units of columns in the 12x188 bytes of the buffer having a size of 12x204 bytes, RS codes the stored packet data again in units of rows, and then executes the FEC packet as shown in FIG. Generate an FEC packet). In the case of FIG. 5, the FEC packet structure is a packet structure in which a header is added to transmit RS data different from the existing packet mode in the packet structure as described above so that the receiver can receive the RS data.

The FEC packet as shown in FIG. 4 includes an application data table corresponding to a size of 12x188 (= 2256) bytes and an RS data table corresponding to a parity part corresponding to the remaining size of 12x16 (= 192) bytes. data table).

The RS data table is transmitted in nine consecutive FEC packets. The set of FEC packets is sent immediately after the set of application data packets used to form the application data table.

First, referring to the structure of a general FEC packet shown in FIG. 4 including all the FEC packets for forming the application data table and the RS data table, the packet is composed of a 2-byte packet header and a 22-byte FEC data field.

The packet header is composed of a packet length field of 2 bits, a counter field of 4 bits and an address field of 10 bits, and used for synchronization of FEC packets.

The packet length field indicates a value '00' indicating a packet length of one 24 byte as shown in FIG. 2 with 2 bits.

The counter field is a 4-bit counter with a value from 0 to 8 that increments one for each successive FEC packet in one set.

The address field is a 10-bit field having a binary value '1111111110'.

The FEC data field includes a set of application data packets used to form an application data table first as described above, followed by an RS data packet used to form an RS data table.

The 192 bytes of the RS data table are sent in a set of nine consecutive 24 byte FEC packets in the FEC data field. The first FEC packet of the set has a counter field set to '0'. The bytes of each data in the RS data table are mapped to consecutive FEC data fields. In this case, the continuous FEC data field starts from the data byte of the first column of the first row and maps down to the column and from left to right, and this mapping is performed until all data is mapped.

When all RS data is mapped, the last 6 bytes of the FEC data field of the 9th FEC packet remain unused. The 6 bytes are padded with '0'.

5 shows a detailed structure of an FEC packet for forming the RS data table. Such a packet structure is similar to that of FIG. 4, which encapsulates an RS parity corresponding to an RS data table at a transmitting end.

That is, the transmitting end adds header information through the encapsulation process to generate an FEC packet having a length of 24 bytes. As described above, the structure of the packet is similar to that of FIG.

The FEC packet of FIG. 5 is also 24 bytes and is composed of a 2-byte packet header and a 22-byte RS data field including the fields shown in FIG.

Referring to FIG. 5 with the RS data field part attached, the FEC packet set consists of 9 consecutive packets (packets 1 to 9), and each packet includes a 2-byte packet header and 22 as shown in FIG. It consists of FEC data fields of bytes.

The 2-bit packet length field in each packet header has the same value of '00' for packets 1 to 9. The counter field is expressed from packet 1 (= '0000') to packet 9 (= '1000'). In addition, the address field has the same value of '1111111110' in both packets 1 to 9.

The 22-byte RS data field stores a 12-byte RS data table in units of columns as described above in Packets 1 to 9. For example, the FEC data field of Packet 1 contains 12 bytes of the first column and 10 bytes of the second column of the RS data table, and the FEC data field of Packet 2 contains the remaining 2 bytes, 3 bytes of the second column of the RS data table. 12 bytes of the first column and 8 bytes of the fourth column are loaded. In this manner, the last packet 9 contains 4 bytes of the fifteenth column and 12 bytes of the sixteenth column, which carries the RS parity of all RS data tables, and the remaining six bytes are zero-padding. do.

When the FEC packet is completed through the above-described processes of FIGS. 4 and 5, the transmitter can transmit. In this case, in transmitting the completed FEC packet, the transmitter reads and outputs the RS-coded buffer of FIG. 4 in units of columns as described above.

Therefore, the receiving end may receive and process the transmitted FEC packet. At this time, the existing receiver may process this. This is because even when the transmitting end transmits packet data in a packet mode other than the EPM, the packets forming the application data table constituting the FEC packet are still read out from the buffer in units of columns.

That is, from the receiver's point of view, the transmitting end transmits the data to the EPM, the packet mode, or the application data table.

However, in the case of the existing receiver, if the transmitting end transmits to the EPM, the RS parity added by RS coding the application data table as described above is also transmitted in units of columns as described above. Since it is determined that a CRC error has occurred, no matter how much the sender transmits to the EPM to improve the reception performance, the receiver always has the same performance as the conventional packet mode.

6 illustrates an example of a digital broadcasting receiver configured according to the present invention.

Hereinafter, each component of the digital broadcast receiver of FIG. 6 will be described.

The antenna 600 receives a signal including packet data transmitted from the transmitting end to the EPM.

The tuner 601 converts a signal received through the antenna 600 into a pass-band signal of a desired intermediate frequency.

The AGC 602 multiplies the gain value calculated according to the reference signal magnitude to output the signal to the A / D 603 in order to maintain a constant signal magnitude output to the A / D 603.

Accordingly, the A / D 603 converts an analog signal into a digital signal by performing sampling regardless of the received signal size.

The mode detector 604 detects a transmission mode of the received signal.

The I / Q divider 605 restores the real part of the received complex signal to a complex signal.

After eliminating unnecessary guard intervals, the OFDM demodulator 607 converts a signal in the time domain into a signal in the frequency domain through a fast fourier transform (FFT).

The signal synchronizer 606 receives the output of the I / Q divider 605 and the output signal of the OFDM demodulator 607 and extracts information necessary for synchronization in the time / frequency domain of the signal.

The frequency deinterleaver 608 restores the positions of the sub-carrier signals interleaved at the transmitter.

The block aggregater 609 separates a fast information channel (FIC) channel, which is a control channel, and a main service channel (MSC) channel, which is a data channel, and the FIC decoder 610 may block the block aggregater 609. Receives the separated FIC channel in Mn and extracts information necessary for MSC channel decoding.

The temporal deinterleaver 611 restores the 16 logical frames interleaved at the transmitter for the MSC channel separated by the block aggregater 609 in the original packet order.

A convolutional decoder 612 corrects a random error occurring on a transmission channel with respect to the time interleaving signal.

The energy descrambler 613 restores the error corrected data to original data.

Channel divider 2 614 distinguishes and separates the audio, video and / or data signals included in the transmitted MSC channel.

Thus, the signal separated at channel divider 2 614 is decoded through each decoder.

In the case of the separated audio signal, it is decoded by the audio decoder 618.

In the case of the separated video signal, the interleaved data is further rearranged in the original order by a convolutional deinterleaver (615), and then RS encoded (Reed-Solomon) by the RS through the RS decoder 616. The encoded data is RS-decoded for error correction and finally decoded by the video decoder 619.

In this case, the FIC data decoder 617 decodes separate data transmitted through the separated FIC channel.

In the case of the separated data signal, it is transmitted to the EPM in accordance with the present invention, and is processed by the EPM processor 620 and finally decoded by the data decoder 621.

Hereinafter, the EPM processing unit 620 will be described with reference to the present invention. 7 illustrates an example of an internal block diagram of the EPM processing unit 620 configured according to the present invention.

First, referring to a schematic process of the EPM processor 620, the digital broadcast receiver separates packet data transmitted from the transmitter to the EPM in the channel distributor 2 614, and separates the separated EPM packet data. Before decoding it, the block is deinterleaved and read through EPM synchronization, and then finally decoded after RS decoding.

Referring to FIG. 7, the EPM processor 620 in the digital broadcast receiver includes a synchronizer 701, a storage 702, and an RS decoder 703. The digital broadcast receiver further includes a restoration unit 704.

When the receiver sends packet data to the EPM, the receiver must first synchronize to process the packet data. That is, the receiving end can configure the correct FEC packet only by knowing the starting point of the application data table using the header information included in the FEC packet.

The synchronization unit 701 synchronizes the RS data table through the header of the FEC packet, and after resynchronizing the application data table, resynchronizes the data of 12x204 (= 2472) bytes in the same way as the transmitting end. do. 8 illustrates an example of an internal configuration block diagram of a synchronization unit according to the present invention.

Looking at the synchronization process in the synchronization unit 701 in more detail, the packet data input to the synchronization unit 701 is not a byte unit but a bit unit. Therefore, the synchronization unit 701 receives and processes the input unit of the bit unit into a case of not knowing or not knowing the starting point for binding the byte.

That is, the bit 2 byte unit 801 monitors the input bit into bytes when the start point of the byte unit for the packet data of the input bit unit is known, and binds it in two byte units from the start point.

However, when the byte / 2 byte windowing unit 802 does not know the starting point of the byte unit for the packet data of the unit of input bit, the input bits are sequentially monitored in units of two bytes.

The difference between the bit 2 byte portion 801 and the byte / 2 byte windowing portion 802 is a bit 2 byte portion 801 in the case of knowing the starting point of the byte unit for the packet data can be accurately monitored, The byte / 2 byte windowing unit 802 simply monitors the input bit in units of 2 bytes without knowing the starting point for the accurate monitoring, and the efficiency thereof is significantly lower than that of the bit 2 byte unit 801.

The first comparison unit 803 continuously monitors two bytes of input packet data as described above to determine whether the header (0000001111111110) of packet 1 of FIG. 5 is received. This is for synchronization of packet data.

When the header of the packet 1 is monitored as described above, the generation unit 804 generates a synclock and a confidence coefficient, and the header of the next packet (number 2, 3, ..., 9) Predict location.

In addition, the second comparison unit 805 compares the header values of the packets actually input and the header values of the expected packets at the header positions of the next packets expected from the header of the first packet that is first caught, and compares the two headers. If the values match, the confidence counter is increased; if they do not match, the confidence coefficient is decreased.

The second comparison unit 805 compares as described above and continuously increases or decreases the confidence coefficient to check whether the confidence coefficient value falls below a predetermined value, for example, '1' or less.

The second comparison unit 805 outputs to the synchronization unlocking unit 806 when the confidence coefficient value falls below a specific value '1' as a result of the check, and the synchronization unlocking unit 806 releases the previously generated synchronization signal ( unlock) and repeat the above process. That is, it is determined whether the header of packet 1 is received again.

However, if the check result exceeds the confidence coefficient value, the second comparator 805 outputs to the sync hold unit 807 so that the sync hold unit 807 maintains the generated sync signal.

Through the above-described process, the synchronization unit 701 outputs packet data synchronized.

The storage unit 702 may receive and temporarily store the synchronized packet data. For example, the storage unit 702 may have a buffer.

Hereinafter, for convenience of description, the storage unit 702 will be described with an example having two buffers (buffer 0 and buffer 1).

As will be described later, packet data is continuously input during a series of read / write processes between the storage unit 702 and the RS decoder 703, and an additional buffer is required to receive the data in real time. The packet data input to is repeatedly read / write in a ping-pong structure.

That is, the storage unit 702 temporarily stores the packet data received in byte units in the buffers 0 and 1 in a ping-pong structure.

Accordingly, buffer 0 in the storage unit 702 reads the data of the synchronized packet as much as the size of the buffer, and outputs the data to the RS decoder 703 in units of rows. In this case, the reading in units of rows is performed by RS encoding in units of rows at the transmitting end.

In this case, when packet data is continuously received before the RS decoded packet data is received by outputting the packet data to the RS decoder 703 in units of rows from the buffer 0, the buffer 0 to the buffer 0 for real time processing thereof. Repeat the same operation.

The RS decoder 703 first calculates a syntax for the received packet data. At this time, if there is no error in the received packet data, '0' is output as a positive value.

However, as a result of the calculation, if there is an error in the received packet data, a value other than '0' will be output as a false value for the corresponding packet data.

Therefore, the RS decoder 703 may estimate an error value from the calculated and output positive value. In addition, the RS decoder 703 may determine a position polynomial coefficient of the error from the output positive value, and estimate the error position using the determined coefficient.

In addition, the RS decoder 703 synchronizes with after the positive value is calculated through the first input first output (FIFO), and corrects the error value to the correct value using the calculated error position and the error value again in row units. Output to the storage unit 702.

In this case, the RS decoder 703 may output the packet data received in the buffer 0 in the storage unit 702 to the buffer 0 again, and the packet data received in the buffer 1 to the buffer 1.

Each buffer in the storage unit 702 receives the error corrected signal from the RS decoder 703 and outputs the data to the data decoder 621 in units of columns for final decoding.

At this time, since the buffer has no header information encapsulated in RS parity, when the RS parity portion is read, original buffer information is restored and sent to the final output. The data received in the block behind the EPM is output in the original form including the header information in order to make the packet constant.

Hereinafter, the digital broadcast signal received using the above-described digital broadcast receiver Here's how to do it:

9 is an example of a flowchart illustrating a method of processing a digital broadcast signal received according to the present invention.

First, the synchronization of the RS data table is performed using the header of the packet constituting the FEC packet transmitted to the EPM, and the application data table is synchronized using the synchronized RS data table to obtain the FEC packet related to the packet data transmission. It constitutes (S901).

In operation S902, an error of a packet related to the configured packet data transmission is corrected.

After the error correction as described above, the error corrected FEC packet is output (S903).

In this case, the packet is composed of a packet data bit inputted into a byte and a case of not knowing the starting point. If the starting point is known, the input bit is converted into a byte. Packet data input in byte unit is monitored, and if not known, input packet data is monitored by grouping in byte unit in order.

And when the monitoring results in receiving the header of the first packet constituting the packet related to the packet data transmission, generating a synchronization signal and a confidence coefficient, predict the position of the header of the next packet, the actual at the header position of the expected next packet The header value of the input packets is compared with the header values of the expected packets.

In addition, if the two header values match, the confidence coefficient generated previously is increased, and if it does not match, the confidence coefficient generated is decreased to determine whether the confidence coefficient is less than or equal to a predetermined value, and the determination result is the confidence coefficient. If the value exceeds the specified value, the pre-generated sync signal is maintained and the packet data is output. If the value is less than the specified value, the pre-generated sync signal is solved and the first packet header is again determined.

In the error correcting step, data related to the configured packet data transmission is read in row units for error correction, and the error corrected packet data is finally output in columns.

Since there is no header information encapsulated in the parity included in the RS data table, the final output is further included by restoring and outputting the original header information.

According to the digital broadcast receiver capable of processing data transmitted in the enhanced packet mode (EPM) and the processing method thereof according to the present invention as described above,

First, the reception performance of the receiver can be improved. That is, since RS encoding is performed in a direction orthogonal to the existing packet data, even if a burst error occurs in a fading section, the error is distributed and the error is corrected through RS decoding, so that the reception performance is expected to be improved. Can be.

Second, compatibility with existing receivers that do not have EPM can be maintained. Here, instead of the actual block interleaving where the form of input and output is mixed, virtual block interleaving is performed because the input data is buffered and only RS encoded in the orthogonal direction and output in the order of input. Parity also has no CRC parity and can be discarded in existing receivers. That is, even in a receiver that does not support the existing EPM, the reception performance intended by the EPM cannot be improved, but packet data can be decoded.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (17)

In a digital broadcast receiver, A synchronization unit for synchronizing the first data table with the second data table to form a packet related to data transmission; A storage unit configured to output an input packet related to the data transmission to an RS decoder or to receive and output an error corrected data transmission packet from the RS decoder; And And an RS decoder to correct an error of a packet related to the data transmission. The method of claim 1, The synchronization unit processes the case of knowing the start point of the byte unit for the input packet data and the case of not knowing, If the start point is known, the input bit is made into bytes, and the packet data inputted in units of two bytes from the start point is monitored. If not, the digital broadcasting receiver monitors the input packet data in order of two bytes. . The method of claim 2, The synchronization unit, when receiving the header of the first packet constituting the packet associated with the packet data transmission as a result of the monitoring, generates a synchronization signal and a confidence coefficient, characterized in that for predicting the position of the header of the next packet. The method of claim 3, wherein The synchronization unit compares the header values of the packets actually entered and the header values of the expected packets at the header positions of the next packets expected from the header of the first packet received, and if the two header values match, the predetermined confidence is generated. Digital broadcast receiver, characterized in that to increase the coefficient. The method of claim 4, wherein And if the two header values do not match as a result of the comparison, the synchronization unit reduces the previously generated confidence coefficient. The method according to claim 4 or 5, The synchronization unit maintains the pre-generated sync signal when the increased confidence coefficient exceeds a predetermined value and outputs packet data. And determining whether a header is received. The method of claim 1, The storage unit includes a first storage unit for receiving and temporarily storing the synchronized packet data and outputting the packet data to the RS decoder; And And a second storage unit for receiving and temporarily storing the received packet data and outputting the received packet data to the RS decoder in a process of receiving and outputting error corrected packet data from the RS decoder in the first storage unit. Digital broadcast receiver. The method of claim 7, wherein The first storage unit and the second storage unit reads the received packet data in units of rows and outputs them to the RS decoder, and the packet data received by error correction in the RS decoder is read in columns and finally output. Broadcast receiver. The method of claim 1, The RS decoder calculates a syntax when the packet data is received, outputs a false value, estimates an error value and an error position from the output false value, and synchronizes with the calculated false value through a FIFO. And correcting the error using the estimated error position and the error value and outputting the error correction back to the storage unit. The method of claim 1, And a restoration unit for restoring header information of parity of the first data table. In the method for receiving and processing a digital broadcast signal, Synchronizing a first data table using a header of a packet, and constructing a packet related to packet data transmission by synchronizing a second data table using the first data table; Correcting an error of a packet related to the configured packet data transmission; And And outputting a packet associated with the error corrected packet data transmission. The method of claim 11, The step of constructing the packet is divided into a case of knowing the start point of the byte unit for the input packet data and a case of not knowing, If the starting point is known, the input bit is made into bytes, and the packet data inputted in units of two bytes from the starting point are monitored. If not, the digital broadcasting signal is monitored in order of two bytes. Treatment method. The method of claim 12, As a result of the monitoring, when a header of a first packet constituting a packet related to packet data transmission is received, a synchronization signal and a confidence coefficient are generated, the position of a header of the next packet is predicted, and the actual inputted at the header position of the next packet is predicted. And if the header values of the packets match the header values of the predicted packets, increasing a predetermined confidence coefficient. The method of claim 13, And if the header values of the predicted packets do not match, reducing the previously generated confidence coefficient. The method according to claim 13 or 14, If the increased or decreased confidence coefficient exceeds a predetermined value, the packet data is output by maintaining the generated synchronization signal. If the predetermined confidence value is less than the predetermined value, the previously generated synchronization signal is solved and the first packet header is received again. Digital broadcast signal processing method characterized in that the judging. The method of claim 11, The error correction step of the digital broadcast signal processing method characterized in that for correcting the error by reading the data associated with the configured packet data transmission in a row unit. The method of claim 11, And restoring header information of parity of the first data table.

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