Digital broadcast receiver (versions) and signal processing method. RU patent 2508605.

FIELD: radio engineering, communication.

SUBSTANCE: disclosed is a digital broadcast transmitter, having a random number generator for randomising an input data stream, having zero bytes inserted in a given position, a multiplexer for outputting a data stream generated by inserting certain known data into the position of zero bytes of the randomised data stream, an encoder for encoding the data stream from the output of the multiplexer and a modulator/radio-frequency converter for modulating encoded data, radio-frequency conversion of the modulated data and transmitting the converted radio-frequency data. Reception characteristics are improved even in a multibeam channel by extracting known data from the obtained signal using known data for synchronisation and level equalisation in digital broadcasting.

EFFECT: improving the data corrector for channel estimation using few data and correcting the obtained signal by eliminating the multibeam signal.

20 cl, 11 dwg

This application is selected from the application №2006124608 based on the international application №PCT/KR2005/000179 of 20.01.2005.

The technical field

The present invention relates to a digital broadcast, the transceiver system and mode of signal processing in this system and, more specifically, to digital receiver and the method of processing of signals, which can improve the performance of the reception system by entering a known sequence in the flow of data in a system of partial suppression side band (VSB) and subsequent transmission of data flow from the known sequence.

Preconditions of creation of the invention

System VSB Commission on advanced television standards (ATSC), which is the digital terrestrial broadcasting system in the United States using the sync signal is in a block of 312 segments.

Figure 1 shows a block diagram showing the structure of the transceiver standard ATSC DTV in the form of digital terrestrial broadcasting system of the American type.

Digital broadcasting transmitter, submitted on figure 1, includes a random number generator BUT for hashing of a transport stream (TS) MPEG-2 (expert group on the issues of the moving image), encoder RS (for reed-Solomon code) 120 to add RS byte parity RS to the transport stream to correct bit errors, typical for the working channel of data transmission, interleaver pulses 130 for alternation of RS-encoded data on a defined pattern and encoder lattice 140 to convert data in characters with 8 levels through bar coding data with the ratio of 2/3. Digital broadcasting transmitter performs coding error correction transport stream MPEG-2.

Digital broadcasting transmitter additionally includes multiplexer 150 for input sync signal segment and field clock signal in the data error correction code, as well as the modulator/radio frequency Converter 160 to enter the pilot tone in data characters are introduced sync signal segment and the sync pulse fields by entering a specific size control character in the characters of data, carrying out VSB modulation data symbols by pulse forming character data and conversion modulated data characters in the strip's signal frequency channel for the transmission of the signal of radio frequency bands the channel.

Accordingly, digital broadcasting transmitter transport stream MPEG-2, introduces external code in randomized data through the encoder RS 120, which is external encoder, and distributes the coded data through interleaver pulses 130.

Similarly, digital broadcasting transmitter enters the internal code in in a block of 12 characters through encoder lattice 140, performs the conversion of internal data-encoded characters with 8 levels, inserts the sync pulse fields and sync signal segment in the coded data, performs VSB modulation data and then make the conversion flexible data up in RF signal to the output RF signal.

In addition, digital broadcasting receiver figure 1 includes power settings 210 for conversion of radio signal received by channel up to the main frequency bands, demodulator 220 for the detection of synchronization signal and converted signal demodulation, equalizer 230 to compensate for the distortion of the demodulated signal is occurring because of multipath signal decoder lattice 240 error correction aligned signal and decode aligned signal according to the characters, reverse 250 for reconstruction data, distributed pulses 130 of digital broadcasting transmitter, decoder RS 260 error correction and 270 data were fixed using the decoder RS 260, and for the output of a transport stream MPEG-2.

Thus, digital broadcasting receiver figure 1 converts the RF signal with decreasing frequency the frequency band demodulates and aligns the converted signal and then decodes the demodulated signal to restore it to its original signal.

Figure 2 shows the frame data VSB for use in the system of digital broadcasting American type (8-VSB, in which are entered the sync signal segment and the sync pulse fields.

As shown in figure 2, one frame consists of two fields, one field consists of a single field segment synchronization, which is the first segment, and 312 data segments. Similarly, one segment in the frame data VSB corresponds to one package MPEG-2 and is composed of a synchronization signal segment of the four characters and 828 character data.

Figure 2 sync signal segment and the sync pulse fields are used for synchronization and alignment in digital broadcasting receiver. In other words, the sync pulse fields and sync signal segment are known data between digital broadcasting transmitter and receiver, which is used as a reference signal, when the alignment is performed on the receiver side.

As shown in figure 1, digital terrestrial broadcasting VSB American type is a system of single-carrier and therefore has the disadvantage that it is weakly protected in the channel when due to multipath propagation or Doppler effect. Remove the multipath signal the receiver affect the characteristics of EQ.

However, under existing transport frame shown in figure 2, because the sync pulse field is a reference signal corrector data and appears once every 313 segments, its frequency is relatively low compared with one signal frame, and this reduces the effectiveness of correction.

Disclosure of the invention

Technical problem

General inventive idea is aimed at improving the existing corrector data to assess the channel using a small amount of data, as described above, and to adjust the signal received by removing multibeam signal. The digital broadcasting receiver has the disadvantages that its acquisition characteristics deteriorate in the environment of the lower channel and especially when the Doppler shift frequency in the channel.

Technical solution

The overall purpose of the invention is to eliminate the above-mentioned lack of and solution of other problems connected with the usual device.

Accordingly, the specific objective of this invention is to create a broadcast digital systems of transmission and reception and method of processing in this system, which can improve the characteristics of the receiver system, developing and passing transport signal with known data entered into it on the side of the transmitter and removing the transport signal at the receiver side.

Additional goals and advantages of the present invention will be formulated partially in the following description and, partially, will flow from the description or from the practice of application of the General concept of the invention.

These and other objectives and advantages of the present invention is mainly achieved in the developed by us digital broadcasting transmitter, which contains a random number generator for input data stream that inserts a null bytes in a certain position in the data packet multiplexer to the output stream of data generated by these data known in the position of zero bytes randomized data stream, the encoder to encode the data flow from the output of the multiplexer and the modulator/radio frequency Converter for the modulation of the encoded data of the radio frequency data conversion and transfer the converted RF data.

In addition, the data generator serves to form a sequence that has a predefined combination. RSS data includes information on the specific situation, which introduced zero bytes.

Information is entered in the position of pre-entered zero bytes and contains information about the length of zero bytes.

Coder is a coder reed-Solomon (RS), which is used for parity specified byte to the data, to correct any errors found in canals, interleaver impulses for interchange data with the added parity in the given combination of the lattice, which is used to convert a data in characters with 8 levels, through bar coding data in respect of 2/3.

Interleaver pulse generates a sequential stream of known data, which were put in the same position in a variety of different data streams from the output of the multiplexer.

Modulator/radio frequency Converter modulates the data are partly suppressed side band (VSB), using the normal method of modulation.

Described above and/or other purposes and advantages of the present invention can also be achieved by giving you a way of signal processing for digital broadcasting system, including the stage of hashing input data stream, where zero bytes are entered in a certain position stream output generated data by entering the data known in the position of zero bytes randomized flow data by encoding the data flow for repair errors and modulating the coded data, radio-frequency conversion with modulated data and transfer the converted RF data.

These and/or other purposes and advantages of the present invention can also be achieved by the creation of digital broadcast receiver, containing block settings for reception of a signal that has the data entered in a certain position, and to convert the received signal into group signal demodulator for demodulation group signal equalizer to align the demodulated signal and known data sensor for detection of known data of the aligned signal and transmission output detected by known data in EQ. Equalizer aligns signal using the known data entered from a known sensor data.

Known data contain a sequence that has a predefined combination.

Known sensor data can include at least one correlator for calculating the correlation of the received signal and at least one reference signal generator and the block of comparison for detection of known data, comparing the values of the correlation derived from the correlator.

Reference signal represents the amount of output received after the signal encoding, which includes the known data.

Known sensor data issues discovered known data , and demodulator performs demodulation, using known data.

Above and/or other purposes and advantages of the present invention can be achieved by the proposed method of signal processing for digital broadcasting reception, including the operation of reception of a signal that has the data entered in a certain position, and converts the received signal into group signal demodulation group signal, the alignment of the demodulated signal, removing the known aligned signal and correction of signal, using known the found data.

The predominant effects

As described above, in accordance with the various variants of the present invention, the characteristics of the reception of digital broadcasting system, in particular, the transceiver system, such as characteristics of synchronization and correction, can be improved even in the channel, multipath propagation of signals through the formation and entry of null bytes in the transport stream MPEG-2 and by the transfer of the transport stream, where the well-known data is entered instead of null bytes in digital broadcasting transmitter, and then removing the known data of the received signal and using them for synchronization and equalizing the level of digital broadcasting the receiver.

Similarly, according to different variants of the present invention, the operation of correction of the data could be improved by corresponding regulation of the number of combinations and sequences of known data entered in the traffic flow, and, thus, improving the characteristics of the reception of broadcast digital systems of transmission and reception.

Description of drawings

The above-mentioned objectives and advantages of the present invention will become more obvious when reading the following description of some of the variants of the invention with reference to the accompanying drawings :

Figure 1 - block diagram showing the structure of the system of transmission and reception of digital TV broadcasting American type (ATSC VSB);

Figure 2 - view of illustrating the data frame structure ATSC VSB;

Figure 3 is a block diagram of the structure of the digital broadcast system according to one version of the present invention;

Figure 4 - view, illustrating the MPEG 2 format package the data according to the present invention;

Figure 5 - the kind that illustrates the format randomized data package MPEG-2;

Figure 6 - the kind that illustrates the format of the output of the encoder RS figure 3;

Figure 7 - view to illustrate the format of the output pulses figure 3;

Figure 8 - view, illustrates the format of the output of the encoder lattice figures 3;

Figure 9 - view, illustrating the structure of the famous locating the sensor data figure 3;

Figure 10 is a block diagram explaining the work of digital broadcasting transmitter on one version of the present invention; and

Figure 11 is a block diagram explaining the work of digital radio receiver on one version of the present invention.

The best option

Some variants of the present invention will be described in more detail with links to the accompanying drawings.

The following description the same positions on the drawings are used for the same elements on different graphics. The issues identified in the description of the type of construction details and elements, only serve for a better understanding of the General inventive concept. Thus, it is obvious that the present invention may be carried out not only in this particular version. Similarly, a known function or structure does not detail, because they would make it harder to General description of unnecessary detail.

Figure 3 shows a block diagram showing the structure of digital broadcasting system according to one version of the present invention.

Figure 3 digital broadcasting transmitter includes data generator, 305, the random number generator 310, the first multiplexer 315, encoder RS 320, interleaver pulses 330, encoder lattice 340, second multiplexer 350 and modulator/radio frequency Converter 360.

Random number generator 310 or input stream transport data MPEG-2, to improve the use of a dedicated channel. The data entered in the random number generator 310 format are formed by entering a zero byte, which has the specified length bytes, but does not include the typical data, in particular provision of input transport flow data, which are described in more detail below.

Data generator produces 305 data, prepared beforehand between the side of the transmitter and receiver side (in the future this data is called the known data). These known data refer to a special sequence that has a particular combination, and put in the position in which added zero bytes randomized data. Known data can be easily detected in the shared data, and they are used for synchronization and correction on the receiver side.

The first multiplexer 315 produces a stream of data, including known data generated by the generator data 305 and entered into the data stream, which introduced the zero bytes, in replacement of zero bytes of data from randomized random number generator 310.

Encoder RS 320 adds a parity of these bytes to the data entered from the first multiplexer 320 to fix the problems, come from the channel.

Interleaver pulses 330 performs data striping, which added parity, derived from the encoder RS 320 according to predetermined combinations.

Coder lattice 340 converts data from pulses 330, data characters and performs a transformation of character with 8 levels of data using bar coding with the degree of 2/3.

The second multiplexer 350 introduces sync signal segment data that has been converted to characters encoder lattice 340 in block segment, and introduces the sync pulse of the fields in the block of fields. Similarly, the second multiplexer 350 introduces a pilot signal in the regional part of the low-frequency band frequency spectrum, adding specified amount DC signal data of the specified level.

Modulator/radio frequency Converter 360 performs VSB modulation signal, which was introduced pilot signal, performing the formation of a pulse signal and signal modulation with carrier intermediate frequency and conversion RF signal with increasing frequency, enhances the modulated signal and passes the converted signal via a dedicated channel.

Digital broadcasting receiver figure 3 includes a configuration block 410, demodulator 420, equalizer 430, decoder lattice 440, pulses 450, decoder RS 460, 470 and known sensor data 480, and works in the reverse conversion of digital broadcasting transmitter figure 3.

The configuration block 410 selects the signal and converts the signal selected band in the group signal.

Demodulator 420 retrieves the sync signal from collective fault signal and performs demodulation group signal to pilot input, and the sync signal is entered into group signal. Equalizer 430 removes interference between the received symbols to compensate for the distortion of the demodulated channel, arising from the multipath channel.

Decoder lattice 440 corrects errors characters, decodes fixed characters, and displays these characters. pulses 450 rebuilds the decoded data, which were distributed pulses 330 digital broadcasting transmitter.

Decoder RS 460 corrects errors data, and 470 data corrected decoder RS 460 to restore the data transport stream MPEG-2.

In the process known sensor data 480 determines the position of the known data stream is demodulated data and displays the known data, which are used to detect the synchronization demodulator and compensation corrector data distortion channel. Work of the famous sensor data 480 be described below.

Figure 4 shows the data packet format MPEG-2 according to the present invention. Figure 4 shows that the packet header data MPEG-2 consists of the first byte, which is a signal synchronization, and three bytes packet identifier (PID). Next, hosts the variable field, consisting of a set of bytes, and the first two bytes of the variable field are bits of information management, which includes information about the length of the volatile field.

Similarly, the reported number of null bytes are placed after the information management of two bytes and information about the situation of zero bytes are entered in bits of information management. Because the position of the null bytes fixed, information on the situation of zero bytes indicates information about the length of zero bytes. After zero bytes of data are placed on the payload, which will be transferred.

Figure 5 shows the randomized data format package MPEG-2, which introduced the known data. As shown in figure 5, the first multiplexer 315 introduces known data generated by the generator data 305, in the position of zero bytes in the data, randomized random number generator 310, and displays the data stream that has the format shown on the figure 4.

Figure 7 shows the format of the output pulses figure 3. Interleaver pulses 330 distributes data on the axis of time, so that the data stream would be a distinct distribution, and transport signal acquired resistance against interference.

According to this distribution data made pulses 330 bytes of data placed in the same positions of the various segments in the vertical direction, rebuilt in the form of a data flow, following horizontally in a block of 52 bytes.

The fourth and fifth bytes segments, which are composed of bits of information management, including the provisions of the known data on the figure 6, a change in the data flow (in other words, M56~M5(EOI) and 57~M6 (B4)) consistently in a horizontal direction, as shown in figure 7. Accordingly, the bits of information management are displayed sequentially.

Similarly, fifth, and sixth bytes segments, which are known data, change in the data flow (in other words, 58~M7(B5) and 59~M8(B6)consistently after alternation in the horizontal direction, as shown in figure 7. Accordingly, the same bytes known data introduced in the relevant segments are shown as a sequential stream in a package of 52 bytes.

Figure 8 shows the format of the output of the encoder lattice 340 figure 3. Coder lattice 340 encodes each byte of data from the output of 330 to four characters with 8 levels.

Figure 8 known data bytes same provisions appear as consecutive characters for the specified length in the same segment for each of the 52 segments. Similarly, in one field, there are 6 known sequences of data. In other words, in box 10*6=60 known sequence data, including 10 of zero bytes appear in the same field of traffic flow. Accordingly, the known sequence of data can be easily extracted from the stream data payload.

Figure 9 shows the structure of the famous locating the sensor data 480 figure 3.

Known lidar sensor data 480 composed of digital broadcast receiver figure 3 includes the first correlator 480-1 and from the second to the nth (480-2 - 480-n) and the block of comparison 483.

First correlator 480-1 and subsequent 480-2 - 480-1 calculate the magnitude of the correlation between the data stream of the received signal and the flow of these reference signals. Reference signals used in the first correlator 480-1, and in from the second to the nth (480-2 - 480-n), indicate the number of all cases that may occur when encoding known data on the side of the transmitter.

In other words, the encoder lattice 340 on the side of the transmitter generates different characters with the help of bar coding the same data known in accordance with the initial values stored in its own memory. The number of possible initial values in memory is a finite quantity, for example, four and, thus, the character data are displayed using a lattice-encoding known data, which can be easily defined and calculated.

Accordingly, using the first correlator 480-1 and from the second to the nth (480-2 - 480-n), calculated the correlation values between multiple reference signals that determine the number of all possible cases, and the received signal.

The block of comparison 483 compares the values of the first correlator and correlators from the second to the nth (480-2 - 480-p), and if in the result of comparison of the obtained the maximum value of the correlation, the known data are in a place where obtained the maximum value.

Figure 10 is a block diagram explaining the work of digital broadcasting transmitter shown on figure 3.

Random number generator 310 transport stream MPEG-2, including null bytes (operation S510). The data entered in the random number generator 310, have the format of the data, as shown in figure 4, which includes part of the header, consisting of the first byte, which is a signal synchronization and 3-byte PID, 2-byte bits of information management, including information on the situation of zero bytes, and zero bytes, composed of bytes of a fixed length. Other bytes data refer to data payload that will be transmitted.

After this, the first multiplexer 315 generates a stream of data by entering a known data generated data generator 305, in a position of zero bytes are included in the data, randomized random number generator 310 (operation S520). Known data represent a special sequence that has a particular combination of data, specified between the side of the transmitter and the receiver side, and these data can be easily detected by the differences from the shared data.

Then, to correct errors in the data, which were introduced in the known data due to the characteristics of the channel parity of these bytes is added to the data derived from the first multiplexer 320, and then alternate in fixed combinations. data are converted into characters to be displayed symbols with 8 levels with the help of bar coding in respect of 2/3, and then an operation of error correction surgery S530).

After the sync signal segment is entered in the character data in the block segment, the sync pulse field is entered in the block field, and then in the frequency spectrum is introduced pilot signal (operation S540).

Then VSB modulation signal data through the modulator/radio frequency Converter 360 to signal, which introduced a pilot signal, would have the pulse shape and amplitude modulation is performed with support of intermediate frequency. Modulated signal VSB is converted to radio frequency signal, amplified and then transmitted via a dedicated channel (operation S550).

Figure 11 is a block diagram illustrating the work of digital broadcasting receiver according to one version of the present invention.

The configuration block 410 selects the signal and converts the selected signal into group signal with increasing frequency (operation S610).

Demodulator 420 selects the sync signal from collective fault signal and performs demodulation group signal to pilot input, and sync signal is entered into group signal (operation S620).

Equalizer 430 removes interference between the received symbols of the data to compensate for the distortion of the demodulated signal (operation S630).

In the process known sensor data 480 detects the position of the known aligned data and displays the known data (operation S640). First correlator, 480-1 and from the second to the nth (80-2 - 480-n) famous sensor data 480 calculate the correlation values between multiple reference signals and the received signal. The block of comparison 480 compares the correlation values, detects known data in a position where obtained the maximum value of the correlation, and passes discovered known data on the equalizer 430 to compensate for distortion channel. Similarly, discovered known data can be used to detect the synchronization demodulator 420.

After that, synchronized and corrected data with fixed bugs in characters of the decrypted. The decoded data is rebuilt by changing the rotation and then remove errors by RS decoding operation S650).

Then the data with fixed bugs and displayed as the data transport stream MPEG-2 (operation S660).

Industrial applicability

The present invention relates to a digital broadcast transceiver system and the method of processing data in this system and, in particular, to broadcast transceiver system and the method of processing data in this system, which can improve the performance of the reception of signals in the system by entering a known sequence in residual sideband (VSB) flow data and transmitting the data flow from the known sequence.

1. Digital broadcasting receiver for reception of a signal from a digital transmitter in which digital transmitter block the exchange of data on effectiveness of known data in a certain position in the data, interleaver impulses for interchange of data, including the known data, decoder lattice to convert data in characters with 8 levels through bar coding data with the ratio of 2/3, multiplexer, intended for input: signal synchronization segment data that has been converted to characters encoder lattice unit of the segment - clock pulse of the fields in the block field and pilot signal in the regional part of the low-frequency band frequency spectrum; and modulator, carries a modulation with a partially depressed sideband -encoded data, and digital broadcasting receiver contains a demodulator, performing demodulation with a partially depressed sideband received modulated signal containing -coded character corresponding to the well-known data; and equalizer that removed the interference of the demodulated signal in accordance with -coded symbol consistent with the known data, where the well-known data represents a pre-defined sequence of known data between digital broadcasting transmitter and receiver.

2. Digital broadcasting receiver for reception of a signal from a digital transmitter, in which a digital transmitter enables unit exchange of known data on effectiveness of known data in a certain position in the packet data, the known data are predefined sequence between the digital transmitter and the digital broadcasting receiver, and interleaver provides data striping, including the known data, and encoder lattice converts data in characters with 8 levels with the ratio of 2/3, multiplexer, intended for input: - synchronization signal segment data that has been converted to characters encoder lattice unit of the segment - clock pulse of the fields in the block field and pilot signal in the regional part of the low-frequency band frequency spectrum; and the modulator carries a modulation with a partially depressed sideband -encoded data, and digital broadcasting receiver contains: block settings for receiving signal transmitted digital transmitter, the signal has -coded character corresponding to the well-known data; demodulator performing demodulation partially suppressed side band of the received signal, which was modulator transmitter; and equalizer that removed the interference of the demodulated signal in accordance with -coded symbol consistent with the known data by the compensation demodulated signal distortion arising in channel.

3. Digital radio broadcasting in paragraph 2, additionally contains grating decoder performs error correction -encoded character and decoding -coded character with the error fixed.

4. Digital radio broadcasting in paragraph 2, additionally contains to rebuild the received signal.

5. Digital radio broadcasting according to claim 4, additionally contains decoder performs error correction reconstructed signal.

6. Digital radio broadcasting according to claim 5, additionally contains that signal with error correction.

7. Digital radio broadcasting in paragraph 2, additionally contains detector data for detection of -encoded character corresponding to the known data, the received signal.

8. Digital radio broadcasting in paragraph 7, in which the detector data includes: at least one correlator for calculating the correlation between the received signal and at least one reference signal; and comparator for detection of known data by comparing the correlation values in the output of the comparator.

9. Digital radio broadcasting in paragraph 7, in which the detector transmits data known data equalizer, equalizer removes noise from the demodulated signal, using the known data.

10. Digital radio broadcasting in paragraph 7, in which the detector transmits data known data , and demodulator performs demodulation partially suppressed sidebar using the known data.

11. Digital radio broadcasting in paragraph 2, in which the received signal contains synchronization signal segment and the clock signal of the field, which differs from the known data.

12. A way to handle signals in a digital broadcasting receiver receiving the signal from the digital transmitter containing block the exchange of data, which introduces known data in a certain position in the data, the known data are pre-defined sequence between the digital transmitter and the digital broadcasting receiver, and data striping, including the known data, and conversion data in characters with 8 levels through bar coding data with the ratio of 2/3, and the multiplexer designed for input: signal synchronization segment data that has been converted to characters encoder lattice unit of the segment - clock pulse of the fields in the block field and pilot signal in the regional part of the low-frequency band frequency spectrum, and the method comprises the following stages: the reception of the signal transmitted digital transmitter, the signal has -coded character with 8 levels, corresponding to the well-known data; execution demodulation with partially suppressed side-band of the received signal, which was modulator transmitter; and the removal of the interference of the demodulated signal in accordance with -coded symbol consistent with the known data, by compensating the demodulated signal distortion in channel.

13. Method of signal processing for para.12, additionally contains an operation to repair errors -encoded character and decoding -encoded character with the error fixed.

14. Method of signal processing for para.12, additionally contains the transformation of the received signal.

15. Method of processing of signals by paragraph 14, additionally contains a fix errors converted the signal received.