CN1224206C - Error-correcting encoding device and method for digital broadcasting system - Google Patents
Error-correcting encoding device and method for digital broadcasting system Download PDFInfo
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- CN1224206C CN1224206C CNB021440573A CN02144057A CN1224206C CN 1224206 C CN1224206 C CN 1224206C CN B021440573 A CNB021440573 A CN B021440573A CN 02144057 A CN02144057 A CN 02144057A CN 1224206 C CN1224206 C CN 1224206C
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Abstract
An error correcting encoding apparatus, an error correcting decoding device and a process thereof. The encoding apparatus comprises a first externally encoding unit used for externally encoding a first conveying flow to provide the first externally encoding data; a second externally encoding unit used for externally encoding a second conveying flow to provide the second externally encoding data;a second externally intertexture unit used for externally interweaving the second externally encoding data to change the order of the externally encoding data; a third externally encoding unit used for externally encoding data output by the second externally intertexture unit to output the third externally encoding data; a coalition unit used for combining the first externally encoding data and the third externally encoding data to form merging data; a first externally interweaving unit used for externally interweaving the merging data; an internally encoding unit used for internally encoding the interwoven data output by the first externally interweaving unit; and an internally interweaving unit used f or internally interweaving the internally encoding data output from the internally encoding unit, wherein the first conveying flow has a relatively higher transmission rate than the second conveying flow. The receiver can receive signals more reliably and receive large-capacity data at a static state receiving environment.
Description
Technical field
A kind of apparatus and method that in digit broadcasting system, are used for error correction coding of relate generally to of the present invention, and relate in particular to a kind of encoder for correcting and the method for in digit broadcasting system, broadcast data being carried out error correction coding for the stable reception at the receiver place in dynamic and static two kinds of reception environments.
Background technology
Usually, the broadcast system of Digital Television (DTV) can be divided into roughly image encoding unit and image modulation unit.The digital data compression to 15 of about 1 gigabit/sec (Gbps) that described image encoding unit will be imported from the high-definition image source is to the data of 18 mbit/(Mbps).Described image modulation unit arrives receiving terminal by the numerical data of finite bandwidth channels transmit tens mbit/of about 6 to 8 megahertzes (MHz).DTV has used a kind of ground while broadcasting method that is utilized as the very high frequency(VHF)/hyperfrequency (VHF/UHF) of television broadcasting purpose distribution.
Adopted OFDM (OFDM) method in Europe, increased the transfer rate of every bandwidth and the digital tv ground broadcasting of jamproof benefit as obtaining picture as one of Ditital modulation method.Adopt residual sideband (VSB) modulation to be used for described digital tv ground broadcasting in the U.S..
Usually, the mistake that produces during the transfer of data of error correction coding (ECC) correction in digital communication.ECC is by general being categorized as block code and rolling up coding.
Described block code is the unit encoding data with the piece.Described convolution code is carried out coding via the memory of a constant volume to previous and current data.It is the representation example of block encoding that Reed-Solomon (reed-solomon) (RS) encodes.The RS coding has robustness (robust) to burst error.The RS coding is made up of the message that will launch and the parity check word that is used for error correction.
Usually use Viterbi (Viterbi) the algorithm described convolution code of decoding.In the Viterbi algorithm, complexity is index with constraint length K to be increased.K=7 or K=9 are the most widely used at present.
Fig. 1 is the block diagram of a kind of traditional encoder for correcting of using in the reflector of digit broadcasting system.
The encoder for correcting of the reflector of this digit broadcasting system comprises: outer encoder 10, external interleaver 12, inner encoder 14 and interleaver 16.
Outer encoder 10 is that unit is the transmission stream (TS) of error correction coding MPEG-2 (motion image expert group 2) form with the piece.For described outer encoder 10, use the RS encoder usually.
External interleaver 12 is according to the order of predetermined rule change from the RS coded data of described outer encoder 10.Thereby the burst error that may produce is during the transmission spread.For described external interleaver 12, the most widely used is convolutional deinterleaver.
The data that inner encoder 14 codings are mixed with regular fashion by described external interleaver 12.For described inner encoder 14, use convolution coder or turbo (fast) encoder usually.
Interleaver 16 interweaves bit by bit from the coded data of described inner encoder 14, so that spread described burst error.For described interleaver 16, use bit and/or symbol interleaver usually.
In such encoder for correcting, described coded data is that basis is modulated with predetermined modulation method by the modulating unit 18 of described digit broadcasting system, and then launches via a radio-frequency channel.In other words, described modulating unit 18 bases or residual sideband (VSB) modulation or Coded Orthogonal Frequency Division Multiplexing (COFDM) (COFDM) are modulated the coded data from described encoder for correcting.
Fig. 2 is the block diagram of a kind of traditional encoder for correcting of using in the receiver of described digit broadcasting system.
The encoder for correcting of this digit broadcasting system comprises: interior deinterleaver 22, inner demoder 24, outer deinterleaver 26, outer decoder 28.
Interior deinterleaver 22 is based on symbol and/or the Bit Interleave demodulating data from the demodulating unit 20 of the receiver of described digit broadcasting system, so that the burst error that diffusion may take place in described demodulating data.Opposite with the interleaver 16 of the reflector of Fig. 1, described data are deinterleaved is the initial data stream before the interleaver 16 that is imported into this reflector at them.For deinterleaver 22 in described, use bit and/or symbol deinterleaver usually.
The described data that inner demoder 24 decodings are deinterleaved by deinterleaver 22 in described.For described inner demoder 24, the most widely used is Viterbi decoder or turbo decoder.
Outer deinterleaver 26 deinterleaves from the described demodulating data of described inner demoder 24, wherein the described external interleaver 12 with the reflector of Fig. 1 is opposite, the described data initial flow for the signal before the described external interleaver 12 that is imported into Fig. 1 at them that deinterleaved.For described outer deinterleaver 26, use convolutional deinterleaver usually.
Outer decoder 28 is the described deinterleaved data of unit decoding from described outer deinterleaver 26 with the piece.When be input to described outside the described data of decoder 28 when being decoded block by block, described data can be converted to the TS of MPEG-2 form.For described outer decoder 28, use the RS decoder usually.
The described digit broadcasting system of current recommendation is designed to not only can both provide service in static reception environment but also in mobile reception environment.
In static reception environment, the broadcast singal that the receiver of described digit broadcasting system can receive relatively reliably and recover to be received.Yet in mobile reception environment, when channel circumstance changed in time, the receiver of described digit broadcasting system had been degenerated on the precision of recovering the received broadcast signal and reliability.Thereby when when utilizing the described encoder for correcting that disposes in the reflector of described conventional digital broadcasting system and receiver to proofread and correct described broadcast singal wrong, the chance that makes a mistake in broadcast singal is high.
Summary of the invention
Thereby, an object of the present invention is to provide a kind of encoder for correcting and the method thereof that are used at digit broadcasting system, can be in the reception environment of difference, as the broadcast singal of the execution error correction coding of the receiver in mobile or portable reception environment to receive more reliably and to recover to be transmitted.
Another of this aspect is that purpose provides the encoder for correcting in a kind of digit broadcasting system, and the reception environment of feasible not pipe receivers how, that is, that move regardless of reception environment or static, receiver can receive reliably.
Above-mentioned purpose is to realize by being used for a kind of encoder for correcting that is used for the reflector of digit broadcasting system according to the present invention, this encoder for correcting comprises: the first outer coding unit is used for outer coding first and transmits stream (TS1) so that the first outer coded data to be provided; The second outer coding unit is used for outer coding second and transmits stream (TS2) so that the second outer coded data to be provided; The second outer unit that interweaves, be used for outer interweave that coding unit is exported from described second outside described second outside coded data, to change the order of the described second outer coded data according to pre-defined rule; The 3rd outer coding unit being used for the outer coding data that described order that the unit exports changed that interweave, to export the 3rd outer coded data from described second outside; Merge cells is used for the described first outer coded data and the described the 3rd outer coded data are merged, to form a merging data; The first outer unit that interweaves is used for the outer described merging data that interweaves, with the output interleaving data; Interior coding unit, the coding described interleaving data of unit output that from described first outside, interweaves in being used for, the interior coded data of output; And interior interleave unit, interweave in being used for from the described interior coded data of described interior coding unit output, to export interior interleaving data, wherein said first transmits stream (TS1) has than described second transmission stream (TS2) high relatively transfer rate.
According to a further aspect in the invention, provide a kind of error correction/encoding method that is used for the reflector of digit broadcasting system.Described error correction/encoding method comprises step: (a) outer coding first transmits stream (TS1) so that the first outer coded data to be provided; (b) outer coding second transmits stream (TS2) so that the second outer coded data to be provided; (c) outside described second of outer in step (b) the generation of interweaving coded data to change the order of coded data outside described second according to pre-defined rule; (d) be coded in the data that the middle described order that produces of step (c) has changed outside, to export the 3rd outer coded data; (e) the described first outer coded data and the described the 3rd outer coded data are merged, to form a merging data; (f) the outer described merging data that interweaves is to produce interleaving data; (g) be coded in the described interleaving data that produces in the described step (f) in, to produce interior coded data; And coded data in described step (g), produce described that interweave (h), to produce interior interleaving data, wherein said first transmits stream (TS1) has than described second transmission stream (TS2) high relatively transfer rate.
According to another aspect of the invention, provide a kind of error correction decoding device that is used for the receiver of digit broadcasting system.Described device comprises: demodulating unit is used for according to the pre-defined rule demodulated received signal to export a demodulating data; In the unit that deinterleaves, deinterleave in being used for from the described demodulating data of described demodulating unit output, to be diffused in the burst error that takes place in the described demodulating data, deinterleaved data in the output; Interior decoding unit, the decoding deinterleaved data in unit output described that deinterleaves in described in being used for is to export interior decoded data; The first outer unit that deinterleaves is used for outer deinterleaving from the described interior decoded data of described interior decoding unit output, to export the first outer deinterleaved data stream; Separative element, be used for outside described first, deinterleaving unit output described first outside deinterleaved data stream be separated into first data flow (TS1 ') and second data flow (TS2 '), wherein said first data flow (TS1 ') has than the high relatively transfer rate of described second data flow (TS2 '); The first outer decoding unit, and described first data flow of decoding outside being used for (TS1 ') to export the first outer decoded data stream (TS1); The second outer decoding unit, and described second data flow of decoding outside being used for (TS2 ') to export the second outer decoded data stream; The second outer unit that deinterleaves is used for the outer described second outer decoded data stream that deinterleaves to export the second outer deinterleaved data stream; And the 3rd outer decoding unit, be used for the outer decoding described second outer deinterleaved data and flow to export the 3rd outer decoded data stream (TS2).
According to another aspect of the invention, provide a kind of error correction decoding method that is used for the receiver of digit broadcasting system.Described method comprises step: (a) according to the pre-defined rule demodulated received signal to export a demodulating data; (b) the described demodulating data that deinterleaves in described step (a) and to produce, being diffused in the burst error that takes place in the described demodulating data, and deinterleaved data in producing; (c) deinterleaved data in interior produce in described step (b) described of decoding is to produce decoded data in; (d) decoded data in outer produce in described step (c) described that deinterleave is to produce the first outer deinterleaved data stream; (e) will in described step (d), produce described first outside deinterleaved data stream be separated into first data flow (TS1 ') and second data flow (TS2 '), wherein said first data flow (TS1 ') has than the high relatively transfer rate of described second data flow (TS2 '); Described first data flow of decoding (f) (TS1 ') to export the first outer decoded data stream (TS1); Described second data flow of decoding (g) (TS2 ') to export the second outer decoded data stream; (h) the outer described second outer decoded data stream that deinterleaves is to export the second outer deinterleaved data stream; And the decoding described second outer deinterleaved data flows to export the 3rd outer decoded data stream (TS2) (i).
According to the present invention, signal is to have considered that moving with static reception environment of receiver obtains error correction.Correspondingly, the receiver in mobile reception environment can receive described signal reliably, and the receiver in static reception environment can receive the data of larger capacity.Thereby, between TS1 and TS2, can select to be more suitable for the data of reception environment as the error correction encoded data that is received.
Description of drawings
By preferred embodiment of the present invention is described with reference to the drawings, above-mentioned and other purposes of the present invention and characteristics will become apparent, wherein:
Fig. 1 is the block diagram of a kind of traditional encoder for correcting of using in the reflector of digit broadcasting system;
Fig. 2 is the block diagram of a kind of traditional error correction decoding device of using in the receiver of digit broadcasting system;
Fig. 3 is the block diagram of a kind of encoder for correcting of using in the reflector of digit broadcasting system of preferred embodiment according to the present invention;
Fig. 4 is the block diagram of a kind of error correction decoding device of using in the receiver of digit broadcasting system of preferred embodiment according to the present invention;
Fig. 5 illustrates the flow chart that preferred embodiment according to the present invention illustrates a kind of error correction/encoding method;
Fig. 6 illustrates the flow chart that preferred embodiment according to the present invention illustrates a kind of error correction decoding method.
Embodiment
Hereinafter, will be described in detail with reference to the attached drawings preferred embodiment of the present invention.
Fig. 3 is the block diagram of a kind of encoder for correcting of using in the reflector of digit broadcasting system of preferred embodiment according to the present invention.
The encoder for correcting of the reflector of described digit broadcasting system comprises: first outer encoder 500, combiner 510, first external interleaver 520, second outer encoder 540, second external interleaver 560, the 3rd outer encoder 580, inner encoder 600 and interleaver 620.
First outer encoder 500 is the first transmission stream TS1 of error correction based on the MPEG-2 form of piece ground coding input.
Second outer encoder 540 is the second transmission stream TS2 of error correction based on the MPEG-2 form of piece ground coding input.
Second external interleaver 560 is carried out outer interweaving to change the order from the block-based coded data of described second outer encoder 540 according to pre-defined rule.Correspondingly, can be diffused in contingent burst error in the described data.
The described order that the 3rd outer encoder 580 is encoded from described second external interleaver 560 based on piece ground for error correction has changed data.
Simultaneously, first external interleaver 520 interweaves from the merging stream of described combiner 510, to spread the burst error that may take place in described data flow.By doing like this, described first external interleaver 520 changes the order that flows from the described merging of described combiner 510 according to pre-defined rule.Correspondingly, can spread described burst error.
As everyone knows, according to the MPEG standard, the HDTV signal is made up of single-definition (SD) signal and supplementary (SI) signal.Referring to Fig. 3, the data flow TS1 with relative high transmission rates and low error correcting capability is corresponding to SI, and the data flow TS2 with error correcting capability higher than TS1 is corresponding to SD.That is in the situation of HDTV, combiner 510 merges SD and SI comprises that with formation the merging data of SD and SI flows, and provides this merging to flow to first external interleaver to be diffused in the burst error in the described data flow.Inner encoder 600 coding has interweaved and from the data flow of first external interleaver, 520 outputs.
Interleaver 620 is based on symbol and/or the Bit Interleave ground described data flow by described inner encoder 600 codings, the burst error that may take place in described data with diffusion.
After aforesaid error correction coding, described data are modulated with predetermined modulator approach by modulating unit 640, and then launch via radio-frequency channel.In other words, modulating unit 640 is modulated error correction encoded data from described encoder for correcting by residual sideband (VSB) modulation or Coded Orthogonal Frequency Division Multiplexing (COFDM) (COFDM).
Correspondingly, by being that coding TS 2 is added the 3rd outer encoder 580 in described encoder for correcting, that is, data flow TS2 can stand coding twice, and the error correction of TS2 can access more accurately and carry out.The broadcast singal that is used to be transferred to the broadcast singal of predetermined receiver or low resolution may be corresponding to TS2.
For first outer encoder 500, second outer encoder 540 and the 3rd outer encoder 580, use the RS encoder, but the corresponding sign indicating number standard of using is different.In addition, for first external interleaver 520 and second external interleaver 560, can use convolutional deinterleaver.For inner encoder 600, can use convolution coder or Turbo encoder.Simultaneously, for interleaver 620, can use any in block interleaver, bit interleaver and the symbol interleaver.
On the other hand, encoder for correcting shown in Figure 3 can provide the error correction signal of being made up of SD signal and SI signal to receiving terminal.Thus, fixedly receiver receives SD signal and SI signal easily to form the HDTV signal, makes fixed-line subscriber can watch the HDTV program.For the mobile subscriber, he or she can separate SD (corresponding to TS2) signal from the code signal that receives, so that utilize the motion image data of his/her portable terminal acceptance criteria definition; In addition, in the situation of inerrancy SI (corresponding to inerrancy TS1), he or she can watch the HDTV program on the display of his/her portable terminal.
Fig. 4 is the block diagram of a kind of error correction decoding device of using in the receiver of digit broadcasting system of preferred embodiment according to the present invention.
The encoder for correcting of the receiver of described digit broadcasting system comprises: demodulating unit 700, interior deinterleaver 720, inner demoder 740, the first outer deinterleaver 760, separator 770, first outer decoder 780, second outer decoder 800, second outer deinterleaver 820 and the 3rd outer decoder 840.
Interior deinterleaver 720 deinterleaves by described demodulating unit 700 demodulated data based on symbol and/or than specially, to be diffused in contingent burst error in the described demodulating data.That is, deinterleaved from the data of interleaver 620 and be initial flow in the data of input data before the interleaver 620.For example, demodulating unit 700 is adopted residual sideband (VSB) modulation or Coded Orthogonal Frequency Division Multiplexing (COFDM) (COFDM) modulation according to the types of modulation of transmitting terminal.
The first outer deinterleaver 760 deinterleaves from the decoded data of inner demoder 740.Wherein, opposite with interweaving of carrying out of first external interleaver 520 by Fig. 3, described data are deinterleaved to be input to the initial flow of the signal before first external interleaver 520 at signal.
It is two data flow TS1 ' and TS2 ' that separator 770 will separate described interleaving data, switches and then exports them.
The first outer decoder 780 is decoded at the TS1 ' from the data of separator 770 outputs based on piece ground for error correction.The TS1 ' that is input to the first outer decoder 780 based on piece be decoded as the TS1 of MPEG-2 form.
The second outer decoder 800 is decoded at the TS2 from the data of separator 770 outputs based on piece for error correction.
The second outer deinterleaver 820 deinterleaves from the decoded data stream of the second outer decoder 800.Here, opposite with interweaving of described second external interleaver 560, the deinterleaved initial flow of the signal before signal is input to second external interleaver 560 of described data.
The 3rd outer decoder 840 is the outer deinterleaved data stream of unit decoding from the second outer deinterleaver 820 with the piece for error correction.Correspondingly, described data flow TS2 ' by based on piece be decoded as the TS2 of MPEG-2 form.
For interior deinterleaver 720, use symbol deinterleaver.For inner demoder 740, use or Viterbi decoder or turbo decoder.For the first and second outer deinterleavers 760,820, use convolutional deinterleaver.For first, second and the 3rd outer decoder 780,800 and 840, use the RS decoder.
According to this preferred embodiment,, guaranteed than being the more accurate error correction of TS1 by add the 3rd outer decoder 840 for the error correction of TS2.The broadcast singal that is used to be transferred to the low resolution of mobile receiver can be preferably corresponding to TS2.
In the situation of HDTV, form by SD and SI by the signal that receiver receives, and correspond respectively to SD stream with TS2 ' and have the relative high transfer rate and the SI stream of low error correcting capability with error correcting capability higher than SI stream from the data flow TS1 ' that separator 770 is exported.In the fixing situation that receives, if SI stream is faultless, then the SD of the SI stream of the outer decoding of decoder 780 output and the outer decoding of decoder 840 outputs from the 3rd outside can be input to subsequently mpeg decoder (not shown) with formation HDTV data flow outside first.For the mobile subscriber, usually the user only uses the SD signal so that utilize the motion image data of his/her portable terminal acceptance criteria definition.In addition, in the situation of faultless SI (corresponding to inerrancy TS2), the user can watch the HDTV program by add a mpeg decoder in portable terminal on his/her display.
Hereinafter, will describe according to error correction coding of the present invention and coding/decoding method.
Fig. 5 illustrates the flow chart of a kind of error correction/encoding method that explanation preferred embodiment according to the present invention uses at the encoder for correcting of the reflector that is used for digit broadcasting system.For simplicity, will this error correction coding operation be described with reference to figure 3.
As shown in Figure 5, at step S100, this encoder for correcting receives the first transmission stream TS1 and second that is the MPEG-2 form and transmits stream TS2.
When the described transmission of reception was flowed, at step S110, first outer encoder 500 for example transmitted stream TS1 based on first of block encoding input, so that the first outer coded data to be provided.
Simultaneously, at step S120, second outer encoder 540 for example transmits stream TS2 based on second of piece ground coding input, so that the second outer coded data (that is block-based coded data) to be provided.
At step S130,560 pairs of second external interleavers in step S120, produce second outside coded data interweave outside carrying out, to change the order of described data according to pre-defined rule.Correspondingly, can spread the burst error that may in described data, take place.
Then in step S140, the 3rd outer encoder 580 for error correction based on the piece ground data that described order from second external interleaver 560 changed of encoding.
As an example, step S130 and step S140 carry out convolutional interleave and RS coding respectively.
Then, in step S150, combiner 510 has changed described first outer coded data (that is, the coding of output transmits stream TS1 from first outer encoder 500) and the order of exporting from the 3rd outer encoder 580 transmission stream TS2 merges to form one and merges stream.
In step S160, first external interleaver 520 produces the merging stream of (that is, exporting) from combiner 510 in step S150 by using for example a kind of convolutional interleave method to interweave, to be diffused in contingent burst in the described data flow.By doing like this, first external interleaver 520 flows according to the described merging data that pre-defined rule changes from combiner 510.Correspondingly, can spread described burst error.
In step S170, inner encoder 600 is coded in the data flow that produces among the step S160, that is, and and the data flow that from first external interleaver 520, interweaves and export.Here, described inner encoder 600 adopts convolutional coding method or turbo coding method.
Then, in step S180, any by using in block interleaving, Bit Interleave and the symbol interleaving, interleaver 620 is based on symbol and/or than the described data flow that specially interweaves and encoded by inner encoder 600 in step S160, to be diffused in contingent burst error in the described data.
After aforesaid error correction coding, in step S190, in modulating unit 640 by or residual sideband (VSB) modulation or the such predetermined modulation method of Coded Orthogonal Frequency Division Multiplexing (COFDM) (COFDM) modulation modulate described data, and then in step S200, export via radio-frequency channel.
Should be noted that processing procedure as shown in Figure 5 is corresponding to the encoder for correcting of Fig. 3.In by situation corresponding to the SI signal of the data flow TS1 with high relatively transfer rate and low error correcting capability and the HDTV signal formed corresponding to the SD signal of the data flow TS2 with error correcting capability higher than TS1, the merging data stream that comprises SD and SI is formed at step S150 and is interwoven in step S160, to be diffused in the burst error in the described data flow.
That is the error correction signal of being made up of SD signal and SI signal can access processing and be provided to receiving terminal.Thus, fixedly receiver is convenient to receive described SD and SI signal to form the HDTV signal, so that the user can watch the HDTV program.In addition, for the mobile subscriber, he or she can separate SD (corresponding to TS2) signal from the code signal that receives, so that utilize the motion image data of his/her portable terminal acceptance criteria definition; In addition, in the situation of inerrancy SI (corresponding to inerrancy TS1), he or she can watch the HDTV program on the display of his/her portable terminal.
Fig. 6 illustrates the flow chart of a kind of error correction decoding method of using at the error correction decoding device of the receiver that is used for digit broadcasting system according to preferred embodiment according to the present invention explanation.For simplicity, will described error correction decoding operation be described with reference to figure 4.
At first, in step S300, demodulating unit 700 is according to residual sideband (VSB) demodulation or the such pre-defined rule demodulated received signal of Coded Orthogonal Frequency Division Multiplexing (COFDM) (COFDM) demodulation, and this depends on described reception data, to export a demodulating data.
Then, in step S310, interior deinterleaver 720 is based on symbol and/or than the demodulating data that specially deinterleaves and produce in step S300, to spread the burst error that may take place in described demodulating data.That is, from can be deinterleaved initial flow of the data of interleaver 620 for the data before being input to interleaver 620 in described data.As an example, in step S310, carried out in piece demodulation, bit demodulation and the symbol demodulation any one.
Then, in step S320, inner demoder 740 decodes the described deinterleaved data of decoding step S310 by viterbi decoding or turbo, to produce decoded data in first.
In step S330, for example utilize the convolution pattern that deinterleaves, the first outer deinterleaver 760, the first interior decoded data that deinterleaves is to produce the first outer deinterleaved data.
In step S340, separator 770 is separated into two data flow TS1 ' and TS2 ' with the first outer deinterleaved data, switches and then exports them.Here, the first data flow TS1 ' has the high relatively transfer rate than the described second data flow TS2 '.
Then, in step S350, the first outer decoder 780 is the first data flow TS1 ' in the error correction data that decoding is exported based on piece ground from separator 770.TS1 ' the quilt that is input to the first outer decoder 780 based on piece be decoded as the TS1 of MPEG-2 form.And in step S360, the data flow TS1 that is produced can output to next stage and be used for further processing.
Simultaneously, in step S370, the second outer decoder 800 is based on the second data flow TS2 ' in the data of piece ground decoding output from separator 770, to export the second outer decoded data stream.
Then, in step S380, the second outer deinterleaver 820, the second outer decoded data stream that deinterleaves is to produce the second outer deinterleaved data stream.Here, described data the initial flow that deinterleaved for the signal before second external interleaver 560 that is input to Fig. 3 at described signal.Here, the second outer deinterleaver 820 for example carries out that convolution deinterleaves.
In step S390, the 3rd outer decoder 840 is the unit decoding second outer deinterleaved data stream with the piece for error correction.Correspondingly, the second outer deinterleaved data stream that is input to the 3rd outer decoder 840 by based on piece be decoded as the 3rd outer decoded data stream TS2 of MPEG-2 form.
As an example, step S350, step S370 and step S390 carry out the RS decoding.
In the situation of HDTV, described received signal is made up of SD and SI signal, and the data flow TS1 ' that produces in step S340 and TS2 ' correspond respectively to SD stream with error correcting capability higher than SI stream and the SI stream with relative high transfer rate and low error correcting capability.In the fixing situation that receives, if SI stream is faultless, then the SD of the SI of outer decoding stream and outer decoding fails to be convened for lack of a quorum and is input to subsequently mpeg decoder (not shown) to form the HDTV data flow.For the mobile subscriber, usually the user only uses the SD signal so that utilize the motion image data of his/her portable terminal acceptance criteria definition.In addition, in the situation of faultless SI (corresponding to faultless TS2), the user can watch the HDTV program by add a mpeg decoder in portable terminal on the display of his/her portable terminal.
In a word, according to the present invention, signal is to have considered that moving with static reception environment of receiver obtains error correction.Correspondingly, can receive described signal reliably at the receiver of mobile reception environment, and the receiver in static reception environment can receive the data of larger capacity.Thereby, between TS1 and TS2, can select to be more suitable for the data of reception environment as the error correction encoded data that is received.
Though described preferred embodiment of the present invention, yet one of ordinary skill in the art will should be appreciated that, the invention is not restricted to described preferred embodiment, and in as the spirit and scope of the invention, can carry out variations and modifications by the claims definition.
Claims (22)
1. encoder for correcting that is used for the reflector of digit broadcasting system comprises:
The first outer coding unit (500) is used for outer coding first and transmits stream (TS1) so that the first outer coded data to be provided;
The second outer coding unit (540) is used for outer coding second and transmits stream (TS2) so that the second outer coded data to be provided;
The second outer unit (560) that interweaves, be used for that the outer coding unit from described second outside (540) that interweaves exports described second outside coded data, to change the order of the described second outer coded data according to pre-defined rule;
The 3rd outer coding unit (580) being used for the outer coding data that described order that the unit exports changed that interweave, to export the 3rd outer coded data from described second outside;
Merge cells (510) is used for the described first outer coded data and the described the 3rd outer coded data are merged, to form a merging data;
The first outer unit (520) that interweaves is used for the outer described merging data that interweaves, with the output interleaving data;
Interior coding unit (600), the coding described interleaving data that unit (520) is exported that interweaves from described first outside in being used for is to export interior coded data;
Coded data in the interior interleave unit (620), in described coding unit (600) output of interweaving in being used for described, exporting interior interleaving data,
Wherein said first transmits stream (TS1) has than described second transmission stream (TS2) high relatively transfer rate.
2. encoder for correcting according to claim 1 also comprises:
Modulating unit (640) is used for according to the described interior interleaving data of pre-defined rule modulation from described interior interleave unit (620) output, to produce the signal that will launch.
3. according to claim 1 or 2 described encoder for correcting, the wherein said first transmission stream (TS1) is side information data, and the described second transmission stream (TS2) is standard definition data.
4. encoder for correcting according to claim 1, each of the wherein said first outer coding unit (500), the described second outer coding unit (540) and the described the 3rd outer coding unit (580) is the RS encoder, and described first outer each that interweaves the unit (520) and the second outer unit (560) that interweaves is a convolutional deinterleaver.
5. encoder for correcting according to claim 4, coding unit (600) is convolution coder or turbo encoder in wherein said, and interleave unit (620) is any in block interleaver, bit interleaver and the symbol interleaver in described.
6. encoder for correcting according to claim 2, wherein said modulating unit (640) are any in vestigial sideband modulation device or the Coded Orthogonal Frequency Division Multiplexing (COFDM) modulator.
7. error correction/encoding method that is used for the reflector of digit broadcasting system comprises step:
(a) outer coding first transmits stream (TS1) so that the first outer coded data to be provided;
(b) outer coding second transmits stream (TS2) so that the second outer coded data to be provided;
(c) outside described second of outer in step (b) the generation of interweaving coded data to change the order of coded data outside described second according to pre-defined rule;
(d) be coded in the data that the middle described order that produces of step (c) has changed outside, to export the 3rd outer coded data;
(e) the described first outer coded data and the described the 3rd outer coded data are merged, to form a merging data;
(f) the outer described merging data that interweaves is to produce interleaving data;
(g) be coded in the described interleaving data that produces in the described step (f) in, to produce interior coded data; And
(h) coded data in produce described that interweaves in described step (g), producing interior interleaving data,
Wherein said first transmits stream (TS1) has than described second transmission stream (TS2) high relatively transfer rate.
8. error correction/encoding method according to claim 7 also comprises step:
(i) be modulated at interleaving data in produce in the described step (h) described according to pre-defined rule, to produce the signal that to launch.
9. according to claim 7 or 8 described error correction/encoding methods, the wherein said first transmission stream (TS1) is side information data, and the described second transmission stream (TS2) is standard definition data.
10. error correction/encoding method according to claim 7, wherein said step (a) and (b) and each execution RS coding (d), described step (c) and each execution convolutional interleave (f).
11. error correction/encoding method according to claim 10, wherein said step (g) are carried out convolutional encoding or turbo coding, and described step (h) execution block interweaves, any in Bit Interleave and the symbol interleaving.
12. it is any that error correction/encoding method according to claim 8, wherein said step (i) are carried out in vestigial sideband modulation or the Coded Orthogonal Frequency Division Multiplexing (COFDM) modulation.
13. an error correction decoding device that is used for the receiver of digit broadcasting system comprises:
Demodulating unit (700) is used for according to the pre-defined rule demodulated received signal to export a demodulating data;
In the unit (720) that deinterleaves, deinterleave in being used for from the described demodulating data of described demodulating unit (700) output, being diffused in the burst error that takes place in the described demodulating data, and deinterleaved data in the output;
Interior decoding unit (740), the decoding deinterleaved data in unit (720) output described that deinterleaves in described in being used for is to export interior decoded data;
The first outer unit (760) that deinterleaves is used for outer deinterleaving from the described interior decoded data of described interior decoding unit (740) output, to export the first outer deinterleaved data stream;
Separative element (770), be used for outside described first, deinterleaving unit (760) output described first outside deinterleaved data stream be separated into first data flow (TS1 ') and second data flow (TS2 '), wherein said first data flow (TS1 ') has than the high relatively transfer rate of described second data flow (TS2 ');
The first outer decoding unit (780), and described first data flow of decoding outside being used for (TS1 ') to export the first outer decoded data stream (TS1);
The second outer decoding unit (800), and described second data flow of decoding outside being used for (TS2 ') to export the second outer decoded data stream;
The second outer unit (820) that deinterleaves is used for the outer described second outer decoded data stream that deinterleaves to export the second outer deinterleaved data stream; And
The 3rd outer decoding unit (840) is used for the outer decoding described second outer deinterleaved data stream to export the 3rd outer decoded data stream (TS2).
14. error correction decoding device according to claim 13, the wherein said first outer decoded data stream (TS1) is a side information data, and the described the 3rd outer decoded data stream (TS2) is a standard definition data.
15. according to claim 13 or 14 described error correction decoding devices, wherein said demodulating unit (700) is any in vestigial sideband demodulator or the Coded Orthogonal Frequency Division Multiplexing (COFDM) demodulator.
16. error correction decoding device according to claim 15, the unit (720) that deinterleaves in wherein said is any in piece deinterleaver, bit de-interleaver and the symbol deinterleaver, and decoding unit (740) is any in Viterbi decoder and the turbo decoder in described.
17. error correction decoding device according to claim 16, wherein said first outer each that deinterleaves the unit (760) and the second outer unit (820) that deinterleaves is a convolutional deinterleaver, and each of the described first outer decoding unit (780), the second outer decoding unit (800) and the 3rd outer decoding unit (840) is the RS decoder.
18. an error correction decoding method that is used at the receiver of digit broadcasting system comprises step:
(a) according to the pre-defined rule demodulated received signal to export a demodulating data;
(b) the described demodulating data that deinterleaves in described step (a) and to produce, being diffused in the burst error that takes place in the described demodulating data, and deinterleaved data in producing;
(c) deinterleaved data in interior produce in described step (b) described of decoding is to produce decoded data in;
(d) decoded data in outer produce in described step (c) described that deinterleave is to produce the first outer deinterleaved data stream;
(e) will in described step (d), produce described first outside deinterleaved data stream be separated into first data flow (TS1 ') and second data flow (TS2 '), wherein said first data flow (TS1 ') has than the high relatively transfer rate of described second data flow (TS2 ');
Described first data flow of decoding (f) (TS1 ') to export the first outer decoded data stream (TS1);
Described second data flow of decoding (g) (TS2 ') to export the second outer decoded data stream;
(h) the outer described second outer decoded data stream that deinterleaves is to export the second outer deinterleaved data stream; And
(i) the outer decoding described second outer deinterleaved data stream is to export the 3rd outer decoded data stream (TS2).
19. error correction decoding method according to claim 18, the wherein said first outer decoded data stream (TS1) is a side information data, and the described the 3rd outer decoded data stream (TS2) is a standard definition data.
20. according to claim 18 or 19 described error correction decoding methods, wherein said step (a) is carried out in residual sideband demodulation or the Coded Orthogonal Frequency Division Multiplexing (COFDM) demodulation any.
21. error correction decoding method according to claim 20 is any during wherein said step (b) execution block deinterleaves, bit deinterleaves and symbol deinterleaves, and described step (c) is any in Viterbi decoding and the turbo decoding.
22. error correction decoding method according to claim 21, wherein said step (d) and each execution convolution (h) deinterleave, described step (f), (g) and each execution RS decoding (i).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR34685/02 | 2002-06-20 | ||
| KR1020020034685A KR100884408B1 (en) | 2002-06-20 | 2002-06-20 | Error Correction Coding Apparatus of digital broadcasting system |
| KR34685/2002 | 2002-06-20 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100928834A Division CN1735211A (en) | 2002-06-20 | 2002-09-29 | The encoder for correcting of digit broadcasting system and method |
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| CN1466378A CN1466378A (en) | 2004-01-07 |
| CN1224206C true CN1224206C (en) | 2005-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021440573A Expired - Fee Related CN1224206C (en) | 2002-06-20 | 2002-09-29 | Error-correcting encoding device and method for digital broadcasting system |
| CNA2005100928834A Pending CN1735211A (en) | 2002-06-20 | 2002-09-29 | The encoder for correcting of digit broadcasting system and method |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2005100928834A Pending CN1735211A (en) | 2002-06-20 | 2002-09-29 | The encoder for correcting of digit broadcasting system and method |
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| KR (1) | KR100884408B1 (en) |
| CN (2) | CN1224206C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1771961A2 (en) * | 2004-07-29 | 2007-04-11 | QUALCOMM Incorporated | System and method for interleaving |
| KR100794791B1 (en) | 2005-10-21 | 2008-01-21 | 삼성전자주식회사 | Turbo stream processing device and method thereof |
| KR100797176B1 (en) * | 2005-10-21 | 2008-01-23 | 삼성전자주식회사 | Digital broadcasting system and method thereof |
| JP5523120B2 (en) * | 2010-01-14 | 2014-06-18 | 三菱電機株式会社 | Error correction encoding method, error correction decoding method, error correction encoding device, and error correction decoding device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0171748B1 (en) * | 1995-03-20 | 1999-03-20 | 배순훈 | A concatenation coding system |
| JPH10336044A (en) | 1997-06-04 | 1998-12-18 | Toshiba Corp | Receiver |
| US6889351B1 (en) * | 2000-03-30 | 2005-05-03 | Koninklijke Philips Electronics, N.V. | Backward compatible multiple data stream transmission method and system for compressed domain signals |
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2002
- 2002-06-20 KR KR1020020034685A patent/KR100884408B1/en not_active IP Right Cessation
- 2002-09-29 CN CNB021440573A patent/CN1224206C/en not_active Expired - Fee Related
- 2002-09-29 CN CNA2005100928834A patent/CN1735211A/en active Pending
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| Publication number | Publication date |
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| KR100884408B1 (en) | 2009-02-17 |
| CN1466378A (en) | 2004-01-07 |
| KR20030097356A (en) | 2003-12-31 |
| CN1735211A (en) | 2006-02-15 |
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