CN101521736A - Digital broadcasting transmission/reception devices capable of improving receiving performance and signal processing method thereof - Google Patents
Digital broadcasting transmission/reception devices capable of improving receiving performance and signal processing method thereof Download PDFInfo
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- CN101521736A CN101521736A CNA2009101285676A CN200910128567A CN101521736A CN 101521736 A CN101521736 A CN 101521736A CN A2009101285676 A CNA2009101285676 A CN A2009101285676A CN 200910128567 A CN200910128567 A CN 200910128567A CN 101521736 A CN101521736 A CN 101521736A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/015—High-definition television systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/015—High-definition television systems
- H04N7/0152—High-definition television systems using spatial or temporal subsampling
Abstract
Disclosed is a digital broadcasting transmission/reception system having an improved reception performance and a signal-processing method thereof. A digital broadcasting transmitter comprises a randomizer for inputting dual TS stream consists of robust and normal packets having stuff bytes inserted in predetermined positions and randomizing the dual TS stream; a stuff byte exchanger for replacing the stuff byte of a randomized data stream from the randomizer to a predetermined known data; and an encoder for encoding a data streams to which the known data is inserted. Accordingly, the present invention detects the known data from a signal received from a reception side and uses the detected known data for synchronization and equalization, so that the digital broadcasting reception performance can be improved at poor multipath channels.
Description
The application is to be that May 19, application number in 2005 are 200580015642.8, are entitled as the dividing an application of patent application of " digital broadcast transmission/receiving system and the signal processing method that improve receptivity " applying date.
Technical field
The present invention relates to a kind of digital broadcast transmitter and receiver, more particularly, relate to a kind of byte of padding of in double fluid, replacing the insertion data flow with predefined given data, and with digital broadcast transmitter and the signal processing method thereof of its transmission, and corresponding digital broadcasting receiver and signal processing method thereof with the enhancing receptivity.
Background technology
Advanced television systems committee vestigial sideband (ATSC VSB) is the ground-wave digital broadcasting system towards the U.S., and it is that single-carrier scheme and per 312 section units use field sync signal.Therefore, in relatively poor channel, particularly in Doppler's attenuation channel, receptivity is also bad.
Fig. 1 is the block diagram that the traditional transmitter of ATSC VSB is shown.The digital broadcast transmitter of Fig. 1 is reinforcement residual sideband (EVSB) system that is proposed by Philips company, and it forms double fluid (dual stream) and send described double fluid by the normal data that robust data (robustdata) is added existing ATSC VSB system.
As shown in Figure 1, digital broadcast transmitter has: randomizer (11) is used for randomization data; The one RS encoder (12) is used for randomized data are carried out the RS coding; Packet format device (13) is used for the robust data of coded data is interweaved, and rebuilds bag with 1/2 ratio, inserts Packet Identifier (PID) and described data and normal data are multiplexing; Interleaver (14) is used for described data are interweaved; Trellis encoder (15) is used for the robust data execution reinforcement coding to the data that interweave, and carries out the trellis coding of 2/3 common ratio subsequently; Controller (16) is used to export the signal of controlling normal data and robust data; The 2nd RS encoder (17) is used for that the robust data of strengthening coding is carried out RS and encodes (RS re-coding) again, with compatible with existing receiver and replace parity check; Multiplexer (18) is used for field synchronization and the synchronous data of inserting trellis coding of section; And modulator (19), be used for pilot tone being added multiplexing signal and carrying out residual sideband (VSB) modulation and RF up conversion.
With reference to Fig. 1, come multiplexing normal data and robust data (not shown) according to the dual stream scheme that sends normal data and robust data at a channel, and with multiplexing data input randomizer (11).Come the data of randomization input by randomizer (11), and be entered into a RS encoder (12),, and be input to packet format device (13) through the mistake of RS coding with the generation of correction channel.Then, carry out robust process, thereby the robust data in the coded data is interweaved, rebuild, and insert PID with the bag of 1/2 ratio.Subsequently with the data after the robust process and normal data is multiplexing and with its output.
Fig. 2 illustrates from the data format of packet format device (13) output of Fig. 1.
With reference to Fig. 2, with arranged at certain intervals normal data and robust data, thereby normal signal behind the trellis coding and strong signal distribute at regular intervals.
Interleaver (14) by separate data comes the dateout that produces is interweaved, and the trellis encoder (15) of the trellis coding by carrying out common 2/3 ratio is strengthened coding to robust data, and data are carried out trellis coding.The 2nd RS encoder (17) by replacing parity check to the robust data of strengthening coding carry out RS encode again with existing receiver compatibility, and parity check sent to trellis encoder (15).Described signal is through inserting the data multiplexing device (18) of trellis coding synchronously with field synchronization and section, and is sent to for described signal and adds pilot tone and carry out the modulator (19) of VSB modulation and RF up conversion, is sent out subsequently.Here, the controller (16) that is used to control the signal of normal data and robust data by output is controlled normal data and robust data.
Design of graphics 1 towards the surface wave digital television system of the U.S. forming double fluid by the normal data that robust data is added existing ATSC VSB system, and send described double fluid, thereby can send existing normal data and robust data together.
Yet the surface wave digital television system towards the U.S. of Fig. 1 has such problem: although send the double fluid of the robust data have adding since in the multipath channel that the transmission of existing normal flow causes relatively poor transmission performance still substantially less than improvement.In other words, in multi-path environment, the normal flow of improvement is seldom improved receptivity, and robust stream does not have remarkable influence for receptivity.
Summary of the invention
Technical problem
An aspect of of the present present invention is to provide a kind of digital broadcast transmitter, it replaces the byte of padding that inserts double fluid with given data, and send described data to strengthen transmission performance, and the signal processing method of described digital broadcast transmitter is provided, and corresponding digital broadcasting receiver and signal processing method thereof.
Technical scheme
In order to realize an aspect of of the present present invention, digital broadcast transmitter comprises: randomizer, be used to receive the double T S stream of predetermined format, and it is carried out randomization, in described predetermined format, in normal data packet, insert robust data packet, insert normal data with byte of padding at ad-hoc location with predetermined space; Byte of padding is replaced part, is used for predetermined given data and replaces from the byte of padding of the data of randomizer output; The one RS encoder is used for the data of replacing part output from byte of padding are carried out the RS coding; The packet format device is used for the strong bag from the data of RS encoder output is interweaved, and rebuilds form; Interleaver is used for the data from the output of packet format device are interweaved; Trellis encoder is used for carrying out trellis coding from the data of interleaver output; The 2nd RS encoder is used for the strong bag of trellis coded data is carried out the RS coding with the change parity check, and with its input trellis encoder; And modulator, be used to modulate data, and carry out the RF up conversion from trellis encoder output.
Preferably, trellis encoder has the memory that is used for trellis coding, and initialization is from the memory of data of the position input of insertion byte of padding.
Preferably, described digital broadcast transmitter also comprises the byte of padding controller, is used to produce the positional information that is used to refer to byte of padding and controls the control signal of the initialize memory of trellis coding.
In addition, described digital broadcast transmitter also comprises the bag buffer, is used for exporting and storage temporarily and corresponding data in position from the byte of padding of the data of RS encoder output.
More preferably, described bag buffer receives the data that change according to initialize memory from trellis encoder, and upgrades the data of temporary transient storage.
In addition, described digital broadcast transmitter also comprises parity check reconstruction part, be used for receiving data updated from the bag buffer, described data are carried out the RS coding to produce the parity check of change, and the parity check of change outputed to trellis encoder, to replace the parity check that adds by a RS encoder.
More preferably, byte of padding is inserted into the self adaptation field of normal data packet.
In addition, insert about the position of the byte of padding that inserts and the information of length at the ad-hoc location of normal data packet.
In addition, given data can have the sequence that has predefined AD HOC.
Simultaneously, a kind of method for processing signals that is used for digital broadcast transmitter comprises: the randomization step, receive the double T S stream of specific format, and it is carried out randomization, in described specific format, in normal data packet, insert robust data packet, insert normal data with byte of padding at ad-hoc location with predetermined space; The byte of padding replacement step is with the predetermined byte of padding of given data replacement from the data of randomization step output; The one RS coding step is to carrying out the RS coding from the data of byte of padding replacement step output; The bag reconstruction procedures interweaves to the strong bag from the data of RS coding step output, and rebuilds form; The step that interweaves interweaves to the data from the output of bag reconstruction procedures; The trellis coding step is carried out trellis coding to the data that interweave; The 2nd RS coding step is carried out the RS coding with the change parity check to the strong bag in the trellis coded data, and with its input trellis coding step; And modulation step, modulation is from the data of trellis coding step output, and execution RF up conversion.
In addition, digital broadcast transmitter according to the present invention comprises: randomizer, and the double T S that is used for the randomization specific format flows, and described specific format has normal data packet and robust data packet, in described normal data packet, inserts byte of padding at ad-hoc location; Byte of padding is replaced part, is used for predetermined given data and replaces from the byte of padding of the data of randomizer output; The one RS encoder is used for the data of replacing part output from byte of padding are carried out the RS coding; The packet format device is used for the strong bag from the data of RS encoder output is interweaved, and rebuilds form; Interleaver is used for the data from the output of packet format device are interweaved; Trellis encoder is used for carrying out trellis coding from the data of interleaver output; The 2nd RS encoder is used for the strong bag of trellis coded data is carried out the RS coding with the change parity check, and with described data input trellis encoder; And modulator, be used to modulate data, and carry out the RF up conversion from trellis encoder output.
In addition, a kind of method for processing signals that is used for digital broadcast transmitter comprises: the randomization step, the double T S stream of randomization specific format, described specific format has normal data packet and robust data packet, in described normal data packet, inserts byte of padding at ad-hoc location; The byte of padding replacement step is with the predetermined byte of padding of given data replacement from the data of randomization step output; The one RS coding step is to carrying out the RS coding from the data of byte of padding replacement step output; The bag reconstruction procedures interweaves to the strong bag from the data of RS coding step output, and rebuilds form; The step that interweaves interweaves to the data from the output of bag reconstruction procedures; The trellis coding step is carried out trellis coding to the data that interweave; The 2nd RS coding step is carried out the RS coding with the change parity check to the strong bag in the trellis coded data, and with described data input trellis coding step; And modulation step, modulation is from the data of trellis coding step output, and execution RF up conversion.
Comprise with above-mentioned digital broadcast transmitter digital broadcasting transmitter according to the present invention accordingly: demodulator, be used for from the signal of digital broadcast transmitter received code, and with its demodulation, wherein, the ad-hoc location that inserts the double fluid that byte of padding is inserted into by given data that will the be predetermined described encoded signals of encoding; The given data output is used for from the position of the input given data of demodulation, and exports described given data; Equalizer is used for the signal of equalizing demodulation; Viterbi decoder, the given data that is used to use detection is carried out error correction and decoding to the signal of equilibrium; Deinterleaver is used for the data from Viterbi decoder output are deinterleaved; And remove randomizer, be used for going randomization from the data of deinterleaver output.
Preferably, the given data output comprises: known symbol detector is used to detect the information about the ad-hoc location of the signal of the reception of inserting given data; The segment mark generator is used to produce and comprises one or more sections Frame, indicates described ad-hoc location with predetermined identity marking for described section; Trellis interleaver is used for coming coded frame data according to the coding of digital broadcast transmitter; And known data extractor, be used for inserting given data at the ad-hoc location of the Frame that deinterleaves of indicating by identity marking, and with its output.
More preferably, the given data output outputs to demodulator with the given data that detects, and demodulator uses given data to carry out demodulation.
Simultaneously, a kind of method for processing signals that is used for digital broadcasting transmitter comprises: demodulation step, signal from the digital broadcast transmitter received code, and with its demodulation, wherein, the ad-hoc location that inserts the double fluid that byte of padding is inserted into by given data that will the be predetermined described encoded signals of encoding; Given data output step from the position of the input given data of demodulation, and is exported described given data; Equalization step, the signal of equalizing demodulation; Decoding step, the given data that use detects is carried out error correction and decoding to the signal of equilibrium; The step that deinterleaves deinterleaves to the data from decoding step output; And go the randomization step, to going randomization from the data of the step output that deinterleaves.
Beneficial effect
According to the present invention, digital broadcast transmitter inserts the MPEG-2TS bag with byte of padding, replaces the byte of padding that inserts and sends described data with given data, and digital broadcasting transmitter detects and use described given data.Therefore, produce following effect: with the existing digital broadcast system compatible, reduce the complexity of hardware, improve digital broadcasting receptivity under the poor multipath channel.
Description of drawings
Fig. 1 is the block diagram of the transmitter of the traditional ground-wave digital broadcasting towards the U.S. (ATSC VSB) system;
Fig. 2 is the diagrammatic sketch that the form of ATSC VSB data is shown;
Fig. 3 is the diagrammatic sketch that the frame structure of TS bag is shown;
Fig. 4 is the diagrammatic sketch that illustrates according to the frame structure of the TS bag that comprises byte of padding of the present invention;
Fig. 5 is the block diagram according to digital broadcast transmitter of the present invention;
Fig. 6 and Fig. 7 are the diagrammatic sketch that illustrates from the form of the data of the randomizer of Fig. 5 output;
Fig. 8 and Fig. 9 are the diagrammatic sketch that illustrates from the form of the data of the interleaver of Fig. 5 output;
Figure 10 and Figure 11 are the diagrammatic sketch that illustrates from the form of the data of the trellis encoder of Fig. 5 output;
Figure 12 and Figure 13 are the diagrammatic sketch that the form of the data that have parity check of rebuilding according to the trellis encoder initialization of Fig. 5 is shown;
Figure 14 is the block diagram according to digital broadcasting transmitter of the present invention; And
Figure 15 is the diagrammatic sketch that is provided to describe the given data output of Figure 10.
Embodiment
Below, describe the present invention with reference to the accompanying drawings in detail.
Fig. 5 is the block diagram according to digital broadcast transmitter of the present invention.The EVSB system of Fig. 1 that the use Philips proposes realizes the digital broadcast transmitter of Fig. 5.In detail, in digital broadcast transmitter, byte of padding is added in the MPEG-2 bag of normal flow or robust stream, replace the byte of padding that adds with given data, and with its transmission.Then, in receiver, detect described given data, and be used to compensate the distortion that produces by channel.
With reference to Fig. 5, digital broadcast transmitter has: randomizer (110) is used for when normal data and robust data are re-used and import the described data of randomization; Byte of padding is replaced part (115), is used for replacing with particular sequence the byte of padding of the normal flow or the robust stream of randomized data; The one RS encoder (120) is used for the data of replacing part (115) output from byte of padding are carried out Reed Solomon Coding, to correct the mistake that is produced by channel; Packet format device (130) is used for the robust data of coded data is interweaved, and rebuilds bag with 1/2 ratio, inserts PID and multiplexing with normal data; Interleaver (140) is used for the data from packet format device (130) output are interweaved; Trellis encoder (150) is used for the memory value of initialization from the byte of padding of the data of interleaver (140) output, robust data is strengthened coding, and carry out 2/3 common ratio trellis coding; Controller (160) is used to export the signal of controlling normal data and robust data; And the 2nd RS encoder (170), be used for that the robust data of strengthening coding is carried out RS and encode again, with compatible with existing receiver and replace parity check.
In addition, digital broadcast transmitter has: byte of padding controller (125) is used to produce the signal of the position of controlling byte of padding; Bag buffer (135), the output that is used to cushion a RS encoder (120) receive the data according to the initialization change of trellis encoder (150), and upgrade to be used for the data initialization of trellis encoder (150); Odd-even check reconstruction part (145) is used for the data that change by described initialization are carried out the RS coding with the generation odd-even check, and the parity check that produces is imported trellis encoder (150) to replace existing parity check; Multiplexer (180) is used for field synchronization and section are inserted synchronously through trellis coding and mapped data; And modulator (190), be used for pilot tone is added from the signal of multiplexer (180) output, and carry out VSB modulation and RF up conversion.
Input comprises insertion byte of padding wherein according to the normal data packet or the robust data packet of randomizer of the present invention (110).Fig. 3 is the diagrammatic sketch that the frame structure of TS stream bag is shown.Fig. 4 illustrates the MPEG-2TS of the self adaptation field that has byte of padding that comprises according to the present invention to flow the diagrammatic sketch of the frame structure of bag.The MPEG-2 of 188 bytes comprises: comprise that the synchronous 4 byte information signals (MPEG-2 head) of MPEG, 1 byte self adaptation field length information, 1 byte out of Memory, n byte have self adaptation field data and " 188-(4+2+n) " byte ES data of byte of padding.
The frame of the TS stream bag of Fig. 3 comprises MPEG-2 head and self adaptation field or ES data.As shown in Figure 4, have the structure of byte of padding being inserted the self adaptation field, thereby all TS streams comprise the self adaptation field according to normal data packet of the present invention or robust data packet.Import this MPEG-2TS bag, as normal data or the robust data of Fig. 5.
In Fig. 5, in the robust data pre-processor (not shown), handle robust data, itself and normal data is multiplexing, to send to randomizer (110).
Multiplexing data are carried out in randomizer (110) randomization wherein normal data and robust data as mentioned above.
To be input to byte of padding by the randomized data of randomizer (110) and replace part (115), and use the particular sequence that produces by particular sequence generator (not shown) to replace the byte of padding of normal data and robust data, and with its output.Particular sequence is the data with the known predefined pattern of transmitter and receiver, below it is become " given data ".
When byte of padding inserted normal data packet, Fig. 6 illustrated from the form of the data of randomizer (110) output, wherein, uses the particular sequence data, that is, given data is replaced n the byte of padding that inserts in the normal data packet.With reference to Fig. 6, with arranged at certain intervals normal data packet and robust data packet, and given data is replaced byte of padding and is inserted into the self adaptation field of normal data packet.
Fig. 7 illustrates the data format when byte of padding inserts normal data packet and robust data packet respectively, use the particular sequence data, that is, replace n the byte of padding that inserts in normal data packet from the data of randomizer (110) output and the robust data packet with given data.With reference to Fig. 7, with arranged at certain intervals normal data packet and robust data packet, and given data is replaced byte of padding and is inserted into the self adaptation field of normal data packet and robust data packet.
In addition, as mentioned above, the head of the MPEG-2 of output bag data comprises the PID of synchronous and 3 bytes of first byte from randomizer (110).Initial 2 bytes of specified byte self adaptation field comprise the information about the self adaptation field length.
In other words, initial 2 bytes of self adaptation field have the byte of padding that inserts about in the self adaptation field, that is, and and the information of the length of given data.Because the starting position of given data in bag fix, so the information that receiver inserts in can initial 2 bytes according to the self adaptation field is learnt position and length about given data, that is, and the information of quantity.
By a RS encoder (120) data of replacing part (115) output from byte of padding are carried out outer coding, to correct mistake by the channel generation.Interweave by the robust data in the external coded data of packet format device (130), rebuild the bag of robust data, and insert PID with 1/2 ratio.Then, robust data and normal data is multiplexing, and in interleaver (140), described data are interweaved.
Fig. 8 illustrates with given data and replaces after the byte of padding that inserts in the normal data, the form of the data that interweaved by interleaver (140).As shown in Figure 8, come the MPEG-2 bag of scatter diagram 6 with 52 units by interleaver (140).As shown in Figure 8, after data interlacing, the data of same byte location constitute identical row in the MPEG-2 bag.
In addition, Fig. 9 illustrates with given data and replaces after the byte of padding that inserts in normal data and the robust data, the form of the data that interweaved by interleaver (140).As shown in Figure 9, come the MPEG-2 bag of scatter diagram 7 with 52 units by interleaver (140).After data interlacing, the data of same byte location constitute identical row in the MPEG-2 bag, as shown in Figure 9.
Then, the robust data in the data of being exported by interleaver (140) is strengthened coding, and come processing said data with the trellis coding of existing 2/3 ratio by trellis encoder (150).
Figure 10 illustrates by trellis encoder (150) data flow of Fig. 8 is carried out the trellis coding data format of output afterwards.One comprises six convolutional deinterleaver, thereby produces six sequences that comprise byte of padding.In other words, if TS stream has 10 byte of paddings, then in one, produce the known symbol sequence of " 10*6=60 ".
Figure 11 illustrates by trellis encoder (150) data flow of Fig. 9 is carried out the trellis coding data format of output afterwards.
With reference to Figure 10 and Figure 11, after trellis coding, the data of same byte location are included in the data segment in the MPEG-2 bag.Therefore, if byte of padding is added the ad-hoc location of MPEG-2 bag continuously and carries out randomization, and replace byte of padding and carry out trellis coding with particular sequence, then the byte of padding that inserts in the same byte location forms a data segment, and described data segment is a known signal.As a result, data broadcast receiver can detect and use described given data to improve receptivity.
In addition, the 2nd RS encoder (170) is carried out RS to the robust data of strengthening coding and is encoded, with existing receiver compatibility, and carry out nonsystematic RS coding, to replace parity check.
Trellis encoder (150) has the memory (not shown) that is used for trellis coding.Trellis encoder (150) is from the initialization of the starting position execute store of byte of padding or given data.
Simultaneously, bag buffer (135) is from the position corresponding data of RS encoder reception with the initialize memory of trellis encoder (150), and it is cushioned, subsequently, receive new data by the initialize memory change of trellis encoder (150), and upgrade the previous data that cushion, and data updated is input to parity check reconstruction part (145).Therefore, parity check is rebuild part (145) to carrying out the RS coding according to the data of initialize memory change, producing parity check, and the parity check that produces is input to trellis encoder (150) to replace previous parity check.
In addition, the signal of controller (160) output control normal data and robust data, and byte of padding controller (125) produces the signal of the position of control byte of padding.
As Fig. 2 and shown in Figure 8, the data of mapping code in 8 level symbols are inserted data format synchronously with field synchronization and section.Then, provide DC skew, and carry out the VSB modulation by modulator (190), producing pilot tone, with data conversion to RF and send.
Simultaneously, byte of padding controller (125) detects the self adaptation field length of Fig. 4, produces and output is used in reference to the marking signal of the position of the byte of padding of diagrammatic sketch 6 to Figure 13 or known array data based on described detection.
The trellis encoder of Fig. 5 (150) is carried out 12 trellis encoder initialization in the starting position of given data, with the value of the memory member of initialization codes device.Data replacement by the initialization change before had been stored in the value of wrapping in the buffer (135), and used by parity check and rebuild part (145) is replaced previous parity check position according to the new parity check of the data generation of described change value.
Figure 12 illustrates and rebuilds part (145) by the parity check of Fig. 5 and carry out data format after RS coding and the parity check reconstruction for the data with form shown in Figure 10.In addition, Figure 13 illustrates and rebuilds part (145) by the parity check of Fig. 5 and carry out data format after RS coding and the parity check reconstruction for the data with form shown in Figure 11.
With reference to Figure 12 and Figure 13, when the starting position initialization trellis encoder (150) at the symbol sebolic addressing of given data, data value changes by described initialization, thus the output parity check of a RS encoder (120) change.Therefore, parity check reconstruction part (145) uses the previous parity check of the parity updating of change with the execution trellis coding, thereby will can not go wrong when the RS of the digital broadcasting transmitter of describing after a while decoder decode data.
In other words, carry out the initialize memory of trellis encoder (150), so that the data of trellis coding form predefined particular sequence during the symbol sebolic addressing part of given data.Then, in order to change the corresponding parity check of data with the change of initialize memory position, the data of change are carried out the RS coding, thereby produce new parity check, and previous parity check is replaced in the parity check of change.Figure 12 illustrates according to the processing of replacing corresponding parity check by the data of initialize memory change.
Figure 14 is according to the present invention and the block diagram of the digital broadcast transmitter corresponding digital broadcasting receiver of Fig. 5.If the signal that receives comprises: normal data, robust data and byte of padding, then digital broadcasting transmitter has their parts of being used to decode.
The digital broadcasting transmitter of Figure 14 comprises: demodulator (310) is used for that the RF signal is reduced to base band and with its demodulation; Equalizer (320) is used for disturbing between delete mark; Viterbi decoder (330) is used for revising the mistake of balanced signal and carries out decoding; Deinterleaver (340); Packet format device (350) is used for the output demultiplexing to deinterleaver (340), and carries out the reformatting of bag and deinterleaving of robust data; Control signal generator (360) is used to produce the double-current control signal of control; RS decoder (370) is used for carrying out error correction and decoding from the data of packet format device (350) output; Remove randomizer (380) and given data output (400), be used to produce the position of byte of padding and handle given data.
Demodulator (310) is a baseband signal by the RF signal transformation that tuner/IF (not shown) will receive via channel, detect and the baseband signal of demodulation conversion synchronously.The multipath channel distortion of the signal of equalizer (320) compensation demodulation.
Simultaneously, given data output (400) detects the information about the byte of padding quantity in the reserve part that inserts the field sync data segment part, with the positional information of acquisition about known symbol, and the positional information output given data from obtaining.
Figure 15 illustrates the data output unit that is used to detect given data (400) of digital broadcasting transmitter.
Given data output (400) comprising: known symbol detector (410), segment mark generator (420), trellis interleaver (430) and known data extractor (440).
If be inserted into the reserve part of field sync data segment part about the information of the quantity (number) of byte of padding, then the known symbol detector (410) of the given data output (400) in the digital broadcasting transmitter detects the information of described quantity about given data.Based on the information that detects, segment mark generator (420) and trellis interleaver (430) obtain the information about the position of known symbol.From the positional information that obtains, known data extractor (440) output given data is to be used to improve the receptivity of digital broadcasting transmitter.Because the position of byte of padding is fixed all the time, so if can detect the quantity of byte of padding, but then usage counter and control logic realize segment mark generator (420) and trellis interleaver (430).
That is to say that known symbol detector (410) is from comprising about the control information bit extraction of the information of the self adaptation field length of the demodulated data head information about known data location.Comprise information about the information of known data location about known data length.Because known data location presets, so can obtain position and number by learning length according to the known symbol of the coding of given data.
According to the position and the number of known symbol, segment mark generator (420) is used in corresponding position with the predetermined labels of the corresponding length of number of symbol and is carried out mark, and the MPEG-2 transmission frame that produces at least one section and comprise described section.
Trellis interleaver (430) is encoded to the transmission frame that produces in the segment mark generator (420) according to interweaving in the digital broadcast transmitter.
Known data extractor (440) is inserted predefined given data in the position of known symbol, and the data of given data are inserted in output, wherein, the position of known symbol is discerned by the mark of the transmission frame of process coding and output in trellis interleaver (430).
Simultaneously, by Viterbi decoder (330) signal by equalizer (320) equilibrium is carried out error correction, and it is decoded as symbol data.The data of decoding rearrange data by the dispersion of the interleaver (140) of the transmitter of Fig. 5 by deinterleaver (340).By packet format device (350) data that deinterleave are carried out demultiplexing, it is divided into normal data and robust data.The robust data process is wrapped reformatting and is deinterleaved, and is imported into RS decoder (370) with normal data, to carry out error correction.Control signal generator (360) produces the control signal that is used to handle normal data and robust data.By going randomizer (380) to going randomization from the data of RS decoder (370) output.
As mentioned above, produce byte of padding and be inserted into the MPEG-2TS bag, replace the byte of padding that inserts with given data, and it is sent from digital broadcast transmitter.Then, digital broadcasting transmitter detects and uses described given data.Therefore, can improve the receptivity of digital broadcasting transmitter, such as synchronization acquistion and equalization performance.
In addition, byte of padding is inserted into existing transmission frame-form, and only is that the part that keeps produces change, thereby its advantage has been to provide the compatible and additional hardware of existing system to realize easily.
According to the present invention, in digital broadcast transmitter, byte of padding is inserted normal data or the robust data that MPEG-2 wraps, with the byte of padding of given data replacement insertion and with its transmission, thereby digital broadcasting transmitter detects and uses described given data.As a result, the realization of hardware is also uncomplicated, and can improve the digital broadcasting receptivity under poor multipath channel.
Claims (40)
1, a kind of digital broadcast transmitter comprises:
The one RS encoder is used for transport stream TS is carried out the RS coding;
The packet format device is used for the strong bag from the data of RS encoder output is interweaved and rebuilds form;
Interleaver is used for the data from the output of packet format device are interweaved;
Trellis encoder is used for carrying out trellis coding from the data of interleaver output;
The 2nd RS encoder is used for the strong bag of trellis coded data is carried out the RS coding with the change parity check, and with its input trellis encoder; And
Modulator is used to modulate the data from trellis encoder output, and carries out the RF up conversion,
Wherein, TS comprises given data, normal data and robust data, and
Wherein, trellis encoder has the memory that is used for trellis coding, and initialization is from the memory of data of the position input of insertion given data.
2, digital broadcast transmitter as claimed in claim 1 also comprises:
The byte of padding controller is used to produce the positional information that is used to refer to given data and controls the control signal of the initialize memory of trellis encoder.
3, digital broadcast transmitter as claimed in claim 1 also comprises:
The bag buffer is used for exporting and storage temporarily and corresponding data in position from the given data of the data of RS encoder output.
4, digital broadcast transmitter as claimed in claim 3, wherein, the bag buffer receives the data that the initialize memory according to trellis encoder changes, and upgrades the data of temporary transient storage.
5, digital broadcast transmitter as claimed in claim 4 also comprises:
Part is rebuild in parity check, is used for receiving data updated from wrapping buffer, described data is carried out the parity check that RS encodes and changes to produce, and the parity check of change is outputed to trellis encoder, to replace the parity check by RS encoder adding.
6, digital broadcast transmitter as claimed in claim 1, wherein, given data has the sequence that has predefined AD HOC.
7, a kind of method for processing signals that is used for digital broadcast transmitter comprises:
The one RS coding step is used for transport stream TS is carried out the RS coding;
The bag reconstruction procedures is used for the strong bag from the data of RS coding step output is interweaved and rebuilds form;
The step that interweaves is used for the data from the output of bag reconstruction procedures are interweaved;
The trellis coding step is used for carrying out trellis coding from the data of the step output that interweaves;
The 2nd RS coding step is used for the strong bag of trellis coded data is carried out the RS coding with the change parity check, and with its input trellis coding step; And
Modulation step is used to modulate the data from the output of trellis coding step, and carries out the RF up conversion,
Wherein, TS comprises given data, normal data and robust data, and
Wherein, the trellis coding step is carried out the initialization of the memory of trellis coding in the starting position of the data of the position input of inserting given data.
8, method as claimed in claim 7 also comprises:
The byte of padding controlled step produces the control signal that is used to refer to the positional information of given data and is controlled at the initialize memory in the trellis coding step.
9, method as claimed in claim 7 also comprises:
Buffer step, the corresponding data in position of output and temporary transient storage and the given data in the data of RS coding step output.
10, method as claimed in claim 9, wherein, buffer step receives the data according to the initialize memory change of trellis coding step, and upgrades the data of buffering.
11, method as claimed in claim 10 also comprises:
The parity check reconstruction procedures receives data updated from the buffering step, and described data are carried out the parity check of RS coding with the generation change, and described data are outputed to the trellis coding step, to replace the parity check that adds in a RS coding step.
12, method as claimed in claim 7, wherein, given data has the sequence that has predefined AD HOC.
13, a kind of digital broadcasting transmitter comprises:
Known data detector if be used for receiving the data flow that comprises given data and additional data flow, then detects given data from the described data flow of given data and additional data flow that comprises; And
Processor is used to use the given data of detection to come processing said data stream,
Wherein, receive described data flow from the digital broadcast transmitter that comprises trellis encoder, described trellis encoder is used to use internal storage to carry out trellis coding and in response to being used for control signal that control storage the resets internal storage of resetting at the fixed time, and
Wherein, additional data flow is treated to respect to mistake by digital broadcast transmitter and is strong.
14, digital broadcasting transmitter as claimed in claim 13, wherein, by digital broadcast transmitter in response to being used to control the control signal that given data is inserted, the precalculated position of given data being inserted described data flow.
15, digital broadcasting transmitter as claimed in claim 13, wherein, the RS encoder of the digital broadcast transmitter that compensates the RS parity check by resetting according to memory comes processing said data stream.
16, digital broadcasting transmitter as claimed in claim 13 wherein, is treated to described additional data flow with respect to mistake and strong by digital broadcast transmitter, and carries out it multiplexing in described data flow subsequently.
17, digital broadcasting transmitter as claimed in claim 16, wherein, described processor comprises:
Demodulator is used for the described data flow of demodulation;
Equalizer is used for balanced described data flow;
Demodulation multiplexer, being used for described data flow demultiplexing is normal data and additional data flow; And
Robust data processor is used for the additional data flow of demultiplexing is decoded,
Wherein, the use of at least one in demodulator and equalizer given data is carried out at least one of separating in the mediation equalization operation.
18, digital broadcasting transmitter as claimed in claim 17, wherein, described processor also comprises:
The control signal generator is used for controlling normal data and the additional data flow that demodulation multiplexer comes processing said data stream.
19, a kind ofly come stream processing method by digital broadcasting transmitter, described method comprises:
If receive the data flow that comprises given data and additional data flow, then detect given data from the described data flow of given data and additional data flow that comprises; And
Use the given data that detects to come processing said data stream,
Wherein, receive described data flow from the digital broadcast transmitter that comprises trellis encoder, described trellis encoder is used to use internal storage to carry out trellis coding and in response to being used for control signal that control storage the resets internal storage of resetting at the fixed time, and
Wherein, additional data flow is treated to respect to mistake by digital broadcast transmitter and is strong.
20, method as claimed in claim 19, wherein, by digital broadcast transmitter in response to being used to control the control signal that given data is inserted, the precalculated position of given data being inserted described data flow.
21, method as claimed in claim 19, wherein, the RS encoder of the digital broadcast transmitter that compensates the RS parity check by resetting according to memory comes processing said data stream.
22, method as claimed in claim 19 wherein, is treated to described additional data flow with respect to mistake and strong by digital broadcast transmitter, and carries out it multiplexing in described data flow subsequently.
23, method as claimed in claim 22, wherein, described processing operation comprises:
The described data flow of demodulation;
Balanced described data flow;
With described data flow demultiplexing is normal data and additional data flow; And
Robust data process is used for the additional data flow of demultiplexing is decoded,
Wherein, the use given data is carried out at least one of separating in the mediation equalization operation.
24, a kind of digital broadcasting transmitter comprises:
Known data detector if be used for receiving the data flow that comprises given data and additional data flow, then detects given data from the described data flow of given data and additional data flow that comprises; And
Processor is used to use the given data of detection to come processing said data stream,
Wherein, receive described data flow from the digital broadcast transmitter that comprises trellis encoder, described trellis encoder is used to use internal storage to carry out trellis coding and in response to being used for control signal that control storage the resets internal storage of resetting at the fixed time, and
Wherein, described additional data flow is to carry out RS coding by digital broadcast transmitter, interweaves and the stream of packetize.
25, digital broadcasting transmitter as claimed in claim 24, wherein, by digital broadcast transmitter in response to being used to control the control signal that given data is inserted, the precalculated position of given data being inserted described data flow.
26, digital broadcasting transmitter as claimed in claim 24, wherein, the RS encoder of the digital broadcast transmitter that compensates the RS parity check by resetting according to memory comes processing said data stream.
27, digital broadcasting transmitter as claimed in claim 24, wherein, the packet format device that packetize is operating as by digital broadcast transmitter inserts additional data flow with Packet Identifier PID.
28, digital broadcasting transmitter as claimed in claim 24, wherein, the packet format device that packetize is operating as by digital broadcast transmitter duplicates additional data flow.
29, digital broadcasting transmitter as claimed in claim 24, wherein, packetize is operating as by the packet format device of digital broadcast transmitter and rebuilds the form of additional data flow to insert between the normal bag.
30, digital broadcasting transmitter as claimed in claim 24, wherein, by digital broadcast transmitter RS coding, interweave and the packetize operation after, in described data flow, carry out described additional data flow multiplexing.
31, digital broadcasting transmitter as claimed in claim 30, wherein, described processor comprises:
Demodulator is used for the described data flow of demodulation;
Equalizer is used for balanced described data flow;
Demodulation multiplexer, being used for described data flow demultiplexing is normal data and additional data flow; And
Robust data processor is used for the additional data flow of demultiplexing is decoded,
Wherein, the use of at least one in demodulator and equalizer given data is carried out at least one of separating in the mediation equalization operation.
32, digital broadcasting transmitter as claimed in claim 31, wherein, described processor also comprises:
The control signal generator is used for controlling normal data and the additional data flow that demodulation multiplexer comes processing said data stream.
33, a kind ofly come stream processing method by digital broadcasting transmitter, described method comprises:
If receive the data flow that comprises given data and additional data flow, then detect given data from the described data flow of given data and additional data flow that comprises; And
Use the given data that detects to come processing said data stream,
Wherein, receive described data flow from the digital broadcast transmitter that comprises trellis encoder, described trellis encoder is used to use internal storage to carry out trellis coding and in response to being used for control signal that control storage the resets internal storage of resetting at the fixed time, and
Wherein, described additional data flow is to be carried out RS coding, interweaved and the stream of packetize by digital broadcast transmitter.
34, method as claimed in claim 33, wherein, by digital broadcast transmitter in response to being used to control the control signal that given data is inserted, the precalculated position of given data being inserted described data flow.
35, method as claimed in claim 33, wherein, the RS encoder of the digital broadcast transmitter that compensates the RS parity check by resetting according to memory comes processing said data stream.
36, method as claimed in claim 33, wherein, the packet format device that packetize is operating as by digital broadcast transmitter inserts additional data flow with Packet Identifier PID.
37, method as claimed in claim 33, wherein, the packet format device that packetize is operating as by digital broadcast transmitter duplicates additional data flow.
38, method as claimed in claim 33, wherein, packetize is operating as by the packet format device of digital broadcast transmitter and rebuilds the form of additional data flow to insert between the normal bag.
39, method as claimed in claim 33, wherein, by digital broadcast transmitter RS coding, interweave and the packetize operation after, in described data flow, carry out described additional data flow multiplexing.
40, method as claimed in claim 39, wherein, described processing operation comprises:
The described data flow of demodulation;
Balanced described data flow;
With described data flow demultiplexing is normal data and additional data flow; And
Robust data process is used for the additional data flow of demultiplexing is decoded,
Wherein, the use given data is carried out at least one of separating in the mediation equalization operation.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040036002 | 2004-05-20 | ||
| KR1020040036002 | 2004-05-20 | ||
| KR10-2004-0036002 | 2004-05-20 | ||
| KR1020050041532 | 2005-05-18 | ||
| KR10-2005-0041541 | 2005-05-18 | ||
| KR10-2005-0041532 | 2005-05-18 | ||
| KR1020050041532A KR100667329B1 (en) | 2004-05-20 | 2005-05-18 | Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof |
| KR1020050041541 | 2005-05-18 | ||
| KR1020050041541A KR100667316B1 (en) | 2005-05-18 | 2005-05-18 | Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800156428A Division CN100551026C (en) | 2004-05-20 | 2005-05-19 | Improve the digital broadcast transmission/receiving system and the signal processing method of receptivity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101521736A true CN101521736A (en) | 2009-09-02 |
| CN101521736B CN101521736B (en) | 2012-07-18 |
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| CNB2005800156428A Expired - Fee Related CN100551026C (en) | 2004-05-20 | 2005-05-19 | Improve the digital broadcast transmission/receiving system and the signal processing method of receptivity |
| CN2009101285676A Expired - Fee Related CN101521736B (en) | 2004-05-20 | 2005-05-19 | Digital broadcasting transmission/reception devices capable of improving receiving performance and signal processing method thereof |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005800156428A Expired - Fee Related CN100551026C (en) | 2004-05-20 | 2005-05-19 | Improve the digital broadcast transmission/receiving system and the signal processing method of receptivity |
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| KR (1) | KR100667329B1 (en) |
| CN (2) | CN100551026C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7852961B2 (en) | 2004-05-20 | 2010-12-14 | Samsung Electronics Co., Ltd. | Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof |
| WO2008097027A1 (en) | 2007-02-07 | 2008-08-14 | Lg Electronics Inc. | Digital broadcasting system and method of processing data |
| KR101314614B1 (en) * | 2007-02-07 | 2013-10-07 | 엘지전자 주식회사 | Digital broadcasting system and method of processing data |
| KR101494028B1 (en) * | 2007-05-16 | 2015-02-16 | 톰슨 라이센싱 | Apparatus and method for encoding and decoding signals |
| US8359526B2 (en) | 2007-07-05 | 2013-01-22 | Samsung Electronics Co., Ltd. | Apparatus for processing streams and method thereof |
| JP5331814B2 (en) | 2007-10-15 | 2013-10-30 | トムソン ライセンシング | Apparatus and method for communicating burst mode activity |
| KR101534076B1 (en) * | 2008-04-30 | 2015-07-07 | 삼성전자주식회사 | Digital broadcasting transmitter and receiver, and methods for processing streams thereof |
| CN101383809B (en) * | 2008-10-27 | 2010-09-15 | 宁波大学 | Digital television ground broadcast transmitter space-frequency modulation method based on embedded training sequence and BICM |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102312C (en) * | 1995-07-13 | 2003-02-26 | 通用仪器公司 | Method and device for transmission of data by packaging data-flow |
| US6266702B1 (en) * | 1998-09-28 | 2001-07-24 | Raytheon Company | Method and apparatus to insert and extract data from a plurality of slots of data frames by using access table to identify network nodes and their slots for insertion and extraction data |
| KR100308034B1 (en) * | 1998-12-31 | 2001-11-02 | 구자홍 | Apparatus for format conversing |
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2005
- 2005-05-18 KR KR1020050041532A patent/KR100667329B1/en active IP Right Grant
- 2005-05-19 CN CNB2005800156428A patent/CN100551026C/en not_active Expired - Fee Related
- 2005-05-19 CN CN2009101285676A patent/CN101521736B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060047997A (en) | 2006-05-18 |
| KR100667329B1 (en) | 2007-01-12 |
| CN100551026C (en) | 2009-10-14 |
| CN101521736B (en) | 2012-07-18 |
| CN1954607A (en) | 2007-04-25 |
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