CN101356819B - Digital broadcasting transmission system and method - Google Patents
Digital broadcasting transmission system and method Download PDFInfo
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- CN101356819B CN101356819B CN200680050391.1A CN200680050391A CN101356819B CN 101356819 B CN101356819 B CN 101356819B CN 200680050391 A CN200680050391 A CN 200680050391A CN 101356819 B CN101356819 B CN 101356819B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
- H03M13/256—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM] with trellis coding, e.g. with convolutional codes and TCM
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
- H03M13/2957—Turbo codes and decoding
- H03M13/296—Particular turbo code structure
- H03M13/2966—Turbo codes concatenated with another code, e.g. an outer block code
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/13—Linear codes
- H03M13/15—Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes
- H03M13/151—Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes using error location or error correction polynomials
- H03M13/1515—Reed-Solomon codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
- H04H60/07—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
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- Probability & Statistics with Applications (AREA)
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- Multimedia (AREA)
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- Error Detection And Correction (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
A digital broadcasting transmission system and method thereof. The digital broadcasting transmission system, comprises an RS encoder to encode a dual transport stream (TS) which includes a normal stream and a plurality of turbo streams multiplexed together, an interleaver to interleave the encoded dual TS, a turbo processor to detect the turbo streams from the interleaved dual TS and to encode the detected turbo stream, and a trellis encoder to pseudo2 (P-2) vestigial sideband (VSB) code the turbo-processed dual TS, and, then, to perform trellis encoding, and a main multiplexer (MUX) to multiplex the trellis-encoded dual TS by adding a field synchronous signal and a segment synchronous signal thereto.
Description
Technical field
An aspect of of the present present invention relates to a kind of digital broadcasting transmission system and method thereof.More particularly, an aspect of of the present present invention relates to a kind of like this digital broadcasting transmission system and method thereof, and this digital broadcasting transmission system is encoded to turbo stream by making in all sorts of ways, thereby realizes the receptivity of improvement.
Background technology
According to the digital vestigial sideband of Advanced Television Systems Committee (ATSC) (VSB) technology, the received terrestrial digital broadcasting system that comes from the U.S. uses the field sync signal of single carrier and 312 segment units.This system especially has poor receptivity in the channel (such as Doppler's fading channel) of difference.
Fig. 1 is the block diagram of traditional ATSC VSB broadcast transmitting apparatus, and Fig. 2 has shown the frame structure of the data of using in the system in Fig. 1.
More particularly, Fig. 1 has shown the EVSB system, and this EVSB system generates and send dual transmission stream (TS) by the general data of robust data (robust data) being added to existing ATSC VSB system.
With reference to Fig. 1, the transmission of the digital broadcasting transmission system that explained later is traditional.
Normal stream, placeholder (place holder) bag and turbo stream are imported into the TS constructor, and dual TS is configured in the TS constructor.
Dual TS is randomized at randomizer 13, and the stream that Parity Check Bits is affixed to transmission to be being used for carrying out error correction at Read-Solomon (RS) encoder 15, and re-constructs bag in packet formatter 17.In addition, the interleaver 19 that wraps in that re-constructs is interleaved, the data after interweaving in trellis encoder 21 by grid coding.Trellis encoder 21 can compatible Parity Check Bits by producing with interaction that can compatible parity check generator 23.
After trellis encoder 21 was by error correction, the data after the error correction were re-used at multiplexer (MUX) 27 in data, and wherein, MUX 27 is inserted into field sync signal and segment sync signal in the data.Then, carry out the processing that pilot signal is inserted, VSB changes and up-convert into RF channel signal level, and send data by channel.But the control signal of origin self-controller 25 is controlled aforesaid operations.
As shown in Figure 2, the Frame that is applied in to the digital broadcast transmission apparatus among Fig. 1 has continuous bag M0 to M51, and formatted in packet formatter 17, is output then.As shown in the figure, turbo stream and normal stream are set up according to 1: 3 ratio.
Summary of the invention
Technical problem
The problem of VSB system is because the performance that dynamic multi-path disturbs and weak signal causes reduces.But, although exist the conventional digital broadcast transmission system shown in Fig. 1 and Fig. 2 to use the dual TS fact of (this dual TS comprises the normal stream that is added with turbo stream), the conventional digital broadcast transmission system almost can not improve poor receptivity by send normal stream in multipath channel.
In addition, under high relatively power rank (that is, the 4th grade of power that uses in existing 8 grades of power), the average power consumption of stream increases.If use a lot of turbo streams, then the quality of normal stream can reduce relatively.Therefore, limited the interpolation of turbo stream to normal stream.
Technical scheme
An aspect of of the present present invention is to provide a kind of digital broadcasting transmission system, and this digital broadcasting transmission system adds needed so much turbo stream by the P-2VSB coding is applied to turbo stream thereby can be not limited to specific ratios.
According to above-mentioned aspect of the present invention, a kind of digital broadcasting transmission system comprises: the RS encoder, the dual transmission stream (TS) that comprises multiplexing together normal stream and a plurality of turbo stream is encoded; Interleaver interweaves to the dual TS behind the coding; The turbo processor detects turbo stream from the dual TS that interweaves, and detected turbo stream is encoded; Trellis encoder is carried out puppet 2 (P-2) vestigial sideband (VSB) coding to the dual TS after the turbo processing, carries out grid coding then; And main multiplexer (MUX), by field sync signal and segment sync signal are added to the dual TS behind the grid coding, come to carry out multiplexing to the dual TS behind the grid coding.
According to a further aspect in the invention, a kind of method for transmitting digital broadcasting comprises: the dual transmission stream (TS) that comprises multiplexing together normal stream and a plurality of turbo stream is encoded; Dual TS behind the coding is interweaved; Detect turbo stream from the dual TS that interweaves, and detected turbo stream is encoded; Dual TS after the turbo processing is carried out puppet 2 (P-2) VSB coding, carry out grid coding then; And, come to carry out multiplexing to the dual TS behind the grid coding by field sync signal and segment sync signal are added to the dual TS behind the grid coding.
Of the present invention in addition and/or others and advantage will be partly articulated in the following description, and part is clearly from describe, and perhaps can be understood by enforcement of the present invention.
Beneficial effect
As mentioned above, according to each side of the present invention, can use the dual transmission stream that comprises turbo stream and normal stream to carry out broadcast service.
Description of drawings
By below in conjunction with accompanying drawing embodiment being described, these and/or others of the present invention and advantage will become clear, and be easier to understand, wherein:
Fig. 1 is the block diagram of traditional ATSC digital broadcasting transmission system;
Fig. 2 has shown the frame structure of the data of using in the system in Fig. 1;
Fig. 3 is the block diagram of digital broadcasting transmission system according to an exemplary embodiment of the present invention;
Fig. 4 is the block diagram of the TS constructor among Fig. 3;
Fig. 5 to Fig. 7 is the diagrammatic sketch that illustrates from the bag of TS constructor output;
Fig. 8 is the block diagram of the trellis encoder among Fig. 3;
Fig. 9 shows the internal structure of the trellis encoder among Fig. 3;
Figure 10 shows first encoder among Fig. 9;
Figure 11 is the block diagram of the digital broadcasting transmission system of another exemplary embodiment according to the present invention;
Figure 12 and Figure 13 have shown the transport stream that comprises the SRS data;
Figure 14 is the block diagram of the SRS inserter among Figure 11;
Figure 15 shows the trellis encoder among Figure 11;
Figure 16 shows first encoder among Figure 15;
Figure 17 is the block diagram that is applied to digital broadcast receiving system of the present invention;
Figure 18 and Figure 19 are the diagrammatic sketch that shows the operation of Viterbi (viterbi) decoder among Figure 17;
Figure 20 is the block diagram of the turbo decoder among Figure 17;
Figure 21 explains the flow chart of method for transmitting digital broadcasting according to an exemplary embodiment of the present invention.
Embodiment
To describe current embodiment of the present invention now in detail, its example is shown in the drawings, and wherein, identical label is represented identical parts all the time.These embodiment are described below with reference to the accompanying drawings to explain the present invention.
Fig. 3 is the block diagram of digital broadcasting transmission system according to an exemplary embodiment of the present invention.As shown in Figure 3, according to an exemplary embodiment of the present invention digit broadcasting system comprise TS constructor 110, randomizer 120, RS encoder 130, parity check formatter 140, interleaver 150, turbo processor 160, trellis encoder 170, can compatible parity check generator 180, controller 190, main multiplexer (MUX) 200, pilot tone inserter 310, vestigial sideband (VSB) modulator 320 and radio frequency (RF) transducer 330.
120 couples of dual TS that receive from TS constructor 110 of randomizer carry out randomization.By the operation of randomizer 201, improved the utilization of channel space.
130 couples of dual TS after randomizer 120 is randomized of RS encoder encode.RS encoder 130 can be implemented as cascaded encoder, and described cascaded encoder adds Parity Check Bits to transport stream, to be corrected in the mistake that channel produces during the transmission.
The example of reference bag as shown in Figure 6, parity check formatter 140 is changed into predetermined data with Parity Check Bits.Parity check formatter 140 calculates the position of Parity Check Bits by following mathematic(al) representation:
(mathematic(al) representation):
m＝(52×n+k)％207
Wherein, m represents the position of Parity Check Bits before interweaving, n be the position of Parity Check Bits after interweaving (n=0,1 ..., 206), k be with 52 be mould calculate the result that wraps in the order in the field (k=0,1 ..., 51).
Above mathematic(al) representation be used to calculate the value of from 187 to 206 m, if but Parity Check Bits is arranged in PID, AF head and general data, then this mathematic(al) representation is not got the result.By the mathematic(al) representation above when changing the starting position one by one, using iteratively, determine the position of Parity Check Bits.
To comprise that 128 byte turbo data and 54 byte general data the 10th section is example, overlapping 21 bytes of Parity Check Bits and PID, AF head and general data.In this case, by top mathematic(al) representation being applied to 176 to 206 positions of calculating Parity Check Bits, and 20 byte parity bit positions are determined.
Therefore, parity check formatter 140 at first is inserted into tentation data the position of the Parity Check Bits except PID, AF head and general data, then the turbo data is inserted into remainder, to construct new pack arrangement.
150 couples of dual TS of interleaver interweave.Interweaving has changed the position of data in frame, but does not change data itself.
The dual TS of turbo processor 150 after be interleaved at interleaver 150 separates normal stream and turbo stream, and the turbo stream that separates is encoded, to strengthen turbo stream.Explain turbo processor 160 in more detail with reference to Fig. 9 and Figure 10 below.
Dual TS after 170 couples of turbo of trellis encoder handle carries out pseudo-2-VSB (P-2VSB) coding, and carries out grid coding.Explain trellis encoder 170 in more detail with reference to Figure 11 and Figure 13 below.
Can compatible parity check generator 180 by with the interaction of trellis encoder 170, produce be used for the compatibility of receiver apparatus can compatible Parity Check Bits.Can compatible parity check generator 180 can produce based on dual TS bag and dual TS can compatible Parity Check Bits, and TS wraps in RS encoder 130 and added parity check is arranged, and dual TS is encoded in trellis encoder 170.
Main MUX 200 carries out multiplexing with convection current field sync signal and the additional dual TS that provides from trellis encoder 170 that gives of segment sync signal.
According to an aspect of the present invention, the stream of the turbo after turbo processor 160 is processed, and turbos stream trellis encoder 170 by P2-VSB coding after processed, the turbo stream after turbo processor 160 is processed at turbo processor 160, trellis encoder 170 encoded by P2-VSB and grid coding after turbo stream and normal stream all can be re-used.
320 pairs of VSB modulators carry out shaping pulse in the transport stream that pilot tone inserter 310 has added pilot signal, and transport stream is loaded into intermediate frequency carrier, to carry out the VSB modulation that amplitude is modulated.
330 pairs of transport stream after VSB modulator 320 is by the VSB modulation of RF transducer are carried out the RF conversion, transport stream is amplified, and by the channel that distributes transport stream is sent to predetermined frequency band.
Fig. 4 is the block diagram of the TS constructor among Fig. 3.As shown in Figure 4, the TS constructor 110 that is applied to digital broadcasting transmission system according to an illustrative embodiment of the invention comprises input MUX 112, RS encoder 114, packet formatter 116 and TS MUX 118.A plurality of turbo streams that 112 couples of MUX of input are input in the TS constructor 110 carry out multiplexing.Encoded by turbo for one in described a plurality of turbo stream, another is encoded by P2-VSB, and another is encoded by P2-VSB then by the turbo coding.114 pairs of turbo streams after input MUX 112 is re-used of RS encoder carry out the RS coding.The bag of 116 pairs of turbo streams after RS encoder 114 is by the RS coding of packet formatter re-constructs.TS MUX118 carries out turbo stream and normal stream multiplexing, constructs dual TS thus, and wherein, the packet formatter 116 that wraps in of turbo stream is re-constructed.
Fig. 5 to Fig. 7 is the diagrammatic sketch that shows from the exemplary bag of TS constructor 110 outputs.
Usually, the bag that is applied to digital broadcasting comprises 1 byte of sync signal, 3 byte-header and 184 bytes of payload.The head of bag comprises that Packet Identifier (PID), the data based type that is included in the data in the payload in the payload are divided into normal stream and/or at least one turbo stream.
As shown in Figure 5, normal stream (a) is imported into TS constructor 100, and general data (b) is included in the payload part.In addition, there is the adaptation fields be used to represent with the general data of turbo data mixing.Adaptation fields comprises 2 byte AF heads and N byte turbo data+empty data space.Fig. 6 has shown two bags with turbo stream and normal stream respectively, and turbo flows and normal stream can be according to the ratio of 1: 3 or 2: 2 in TS constructor combination with one another.Fig. 7 has shown the exemplary configurations with a corresponding bag of field, and this wraps in TS constructor 110 and is configured according to as shown in Figure 6 form, and is imported into randomizer 120.Normal stream and turbo stream are combined according to 3: 1 ratio.
Fig. 8 is the block diagram of the turbo processor among Fig. 3.As shown in Figure 8, the turbo processor 160 that is applied to digital broadcasting transmission system of the present invention comprises turbo extractor 162, outer encoder 164, external interleaver 514 and processor MUX 168.Turbo extractor 162 extracts turbo stream from the dual TS that is input to turbo processor 160.164 pairs of turbo streams that are extracted at turbo extractor 162 of outer encoder carry out convolutional encoding.514 pairs of external interleavers are interweaved by the turbo stream after the convolutional encoding at outer encoder 164.168 couples of processor MUX turbo stream and the normal stream after external interleaver 514 is interleaved carried out multiplexingly, and exports the stream of gained.
Fig. 9 has shown the internal structure of the trellis encoder among Fig. 3, and Figure 10 has shown first encoder.As shown in Figure 9, trellis encoder 170 comprises first encoder 172 that is used to carry out the P-2VSB coding and second encoder 174 that is used for general grid coding.
With reference to Figure 10, as shown in figure 10, first encoder 172 comprises a MUX 172a, the 2nd MUX 172b, the 3rd MUX 172c, first adder 172d and control signal generator (not shown).The one MUX 172a optionally exports the first input X
1With the second input X
2In one.The first input X
1Also be imported into the 2nd MUX 172b.First adder 172d will be from the output of a MUX 172a and from predetermined register D
0The input addition, and output income value.Register D
0It can be first register of second encoder.The 2nd MUX 172b optionally exports the first input X
1With in the output of first adder 172d one.The output X of the 2nd MUX 172
2' be imported into second encoder 174.The 3rd MUX 172c optionally exports the second input X
2Or the output of a MUX 172.The output X of the 3rd MUX 172c
1' be imported into second encoder.
Control signal generator (not shown) provides control signal, to select from one in a plurality of inputs of a MUX 172a to the three 172c.
Therefore, first encoder 172 has been removed the precoding effect, thereby two outputs of grid coding are with respect to being used for the P-2VSB coded data and can having identical value in a plurality of turbo stream that is input to the TS constructor.
Use comes second coding is handled from the output of first encoder 172 (as shown in Figure 10 one).With reference to Fig. 9, second encoder 174 comprises first to the 3rd register D
0, D
1, D
2, second adder 174a and the 3rd adder 174b.
First to the 3rd register D
0, D
1, D
2Has predetermined bit value.
The 3rd adder 174b will be from another X in the output of first encoder
1' with the second register D
1The storing value addition, output gained data, and will export Z
0Be stored in the first register D
0In.
According to one exemplary embodiment of the present invention,, formed the new data different with the conventional bag data along with data experience the P-2VSB encoding process in turbo processor 160 experience turbo encoding process and at first encoder 172.Therefore, at receiver apparatus incorrect RS decoding may appear.In order to prevent incorrect RS decoding, can compatible parity check generator 180 produce will be inserted into from the Parity Check Bits position of the data of first encoder 172 can compatible Parity Check Bits.
Figure 11 is the block diagram of the digital broadcasting transmission system of another exemplary embodiment according to the present invention, and Figure 12 to Figure 13 has shown the transport stream that comprises additional reference signal (SRS) data.
As shown in figure 11, according to the present invention the digital broadcasting transmission system of another exemplary embodiment comprise TS constructor 110, randomizer 120, SRS inserter 125, RS encoder 130, parity check formatter 140, interleaver 150, turbo processor 160, trellis encoder 170, can compatible parity check generator 180, controller 190, main MUX 200, pilot tone inserter 310, VSB modulator 320 and RF transducer 330.
Digital broadcasting transmission system according to this exemplary embodiment of the present invention has and structure identical shown in Fig. 3.Therefore, identical parts are endowed identical label, and will only explain the different piece of this embodiment now.
From the bag that comprises adaptation fields shown in Fig. 5, comprise that the dual TS of the fill area (stuffing region) in the adaptation fields is imported into randomizer 120.
Figure 12 and Figure 13 have shown the bag that comprises the SRS data of being inserted by SRS inserter 125.As shown in the figure, normal stream and robust stream (robust stream) all comprise S byte SRS data.
Explained remainder with reference to Fig. 3 owing to above, institute thinks for purpose of brevity, with the explanation of omitting these remainder.
Figure 14 is the block diagram of the SRS inserter among Figure 11.As shown in figure 14, SRS inserter 125 comprises SRS mode memory 125a and SRS MUX 125b.SRS mode memory 125a storage is used for the SRS pattern of the insertion of fill area.Make SRS pattern and receiver apparatus compatibility in advance, and the SRS pattern can be used for the equalizer of receiver apparatus.SRS MUX 125b adds the SRS pattern that is stored among the SRS mode memory 125a to normal stream and turbo stream, and is multiplexing to carry out.
Figure 15 has shown the trellis encoder among Figure 11, and Figure 16 has shown first encoder among Figure 15.As shown in figure 15, the trellis encoder 170 according to one exemplary embodiment of the present invention comprises first encoder 172 and second encoder 174.Second encoder 174 comprises first to the 3rd register D
0, D
1, D
2, second adder 174a and the 3rd adder 174b, its structure is identical with the structure of second encoder shown in Fig. 9.First encoder 172 among Figure 16 comprises a MUX 172a to the three MUX172c and first adder 172b, and its structure is identical with the structure of first encoder 172 shown in Figure 10.
The difference of this embodiment and other embodiments of the invention is the P-2VSB coding of first encoder 172, and the grid coding that P-2VSB is coded in second encoder 174 is performed before.The SRS initializing signal is imported into the 2nd MUX 172b and the 3rd MUX 172c.The SRS initializing signal is to first to the 3rd register D of second encoder 174
0, D
1, D
2Carry out initialization, i.e. D
0=D
1=D
2=0.
Figure 17 is the block diagram that is applied to digital broadcast receiving system of the present invention, and Figure 18 and Figure 19 are the diagrammatic sketch that shows the Viterbi decoder that uses.As shown in figure 17, digital broadcast receiving system comprises that demodulator 120, equalizer 420, Viterbi decoder 430, receiver MUX 440, first deinterleaver 450, RS decoder 460, first go randomizer 470, first demodulation multiplexer 480, turbo decoder 510, second deinterleaver 150, parity check eraser 530, second to remove the randomizer 540 and second demodulation multiplexer 550.
Demodulator 410 receives the dual TS that sends from Fig. 3 or digital broadcasting transmission system shown in Figure 11, detects synchronously for the synchronizing signal of baseband signal according to adding, and the execution demodulation.
420 pairs in equalizer is carried out equilibrium at demodulator 410 by the dual TS after the demodulation.Therefore, 420 pairs of channel distortions that cause owing to the multipath of channel of equalizer compensate, and have removed the interference of the code element that receives thus.
The normal stream of 430 couples of dual TS of Viterbi decoder is carried out error correction, the code element after the error correction is decoded, thus the output symbol bag.Viterbi decoder 430 uses schematic diagram shown in Figure 180 that general data is decoded, and uses schematic diagram shown in Figure 19 that the P-2VSB coded data is decoded.
440 couples of receiver MUX are undertaken multiplexing at Viterbi decoder 430 by normal stream after the error correction and the turbo stream after turbo decoder 510 is decoded.
450 pairs of first deinterleavers are deinterleaved by the normal stream behind the Veterbi decoding at Viterbi decoder 430.
460 pairs of RS decoders are carried out RS at first deinterleaver 450 by the normal stream after deinterleaving and decode.
First goes 470 pairs of randomizers to be gone randomization at RS decoder 460 by the decoded normal stream of RS, and the stream of output gained.
510 pairs of turbo decoders are decoded by the turbo stream of the dual TS after the equilibrium at equalizer 420.With reference to Figure 20 turbo decoder 510 is described in more detail below.
150 pairs of second deinterleavers turbo stream after turbo decoder 510 is decoded deinterleaves.
Parity check eraser 530 is removed and is appended at second deinterleaver 150 by the Parity Check Bits of the stream of the turbo after deinterleaving.
Second goes 540 pairs of randomizers to go randomization at the turbo stream that parity check eraser 530 has been removed parity check.
550 pairs of second demodulation multiplexers go randomizer to be carried out demultiplexing by the turbo stream after going randomization second.
Figure 20 is the block diagram of the turbo decoder among Figure 17.As shown in figure 20, turbo decoder 510 comprises TCM map decoder 511, outer deinterleaver 512, outer map decoder 513, external interleaver 514, frame formatter 515 and code element deinterleaver 516.511 pairs of turbo streams of TCM map decoder carry out trellis decode.512 pairs of outer deinterleavers are deinterleaved by the turbo stream after the trellis decode in TCM map decoder 511.513 pairs of outer map decoder deinterleaver 512 are outside carried out convolution decoder by the turbo stream after deinterleaving.514 pairs of external interleavers map decoder 513 are outside interweaved by the turbo stream behind the convolution decoder.
When the outer deinterleaver 512 of TCM map decoder 511 and external interleaver 514 and outside when finishing information exchange between the map decoder 513, the decoded data of TCM map decoder 511 is output being used for the reception of normal stream, and the decoded data of outer map decoder 513 is provided for frame formatter 515.
Figure 21 explains the flow chart of method for transmitting digital broadcasting according to an exemplary embodiment of the present invention.
Hereinafter, explain digital broadcast receiving method according to an exemplary embodiment of the present invention with reference to Fig. 3 to Figure 21.
Dual TS at TS constructor 110 structures is randomized (op610) at randomizer 120, at RS encoder 130 by RS coding (op620), be determined the position of parity check and formatted (op630) at parity check formatter 140, be interleaved (op640) at interleaver 150.
Dual TS after interweaving is separated into normal stream and turbo stream at turbo processor 160, and turbo stream is by turbo coding (op650).
After the turbo coding, trellis encoder 170 uses first encoder 172 to carry out the P-2VSB coding, uses second encoder 174 to carry out grid coding.At this moment, by trellis encoder 170 and interaction that can compatible parity check generator 180, can produce can compatible parity check (op660 to op670).
Therefore, formed the turbo stream after turbo handles, formed being flowed by the turbo that P-2VSB encodes after turbo handles in trellis encoder 170, and being flowed by the turbo of P-2VSB coding and grid coding after having formed turbo and handling in trellis encoder 170, this turbo of three types stream carries out multiplexing in main MUX200 and normal stream, and is constructed to new dual TS (op690).
After dual TS that main MUX 200 is configured had experienced the processing of RF conversion that pilot tone inserter 310 inserts the VSB modulation of the processing of pilot signals and VSB modulator 320 and RF transducer 330, dual TS was sent out (op692) by the channel of being scheduled to.
As mentioned above, the dual TS that sends from digital broadcasting transmission system is received at digital broadcast receiving system, and experience such as modulation, equilibrium, Veterbi decoding, deinterleave, RS decoding, the processing of removing randomization and demultiplexing, being resumed thus is general T S bag, P-2VSB TS wraps and turbo TS wraps.
As mentioned above, digital broadcasting transmission system and method thereof receive normal stream and a plurality of turbo stream, use multiple coding method, therefore can be not limited to specific blending ratio and add turbo stream.In addition, also improved the Data Receiving of channel circumstance in difference.
Although shown and described some embodiments of the present invention, it should be appreciated by those skilled in the art that not breaking away from claim and equivalent thereof to limit under the situation of the principle of the present invention of its scope and spirit, can make various changes to these embodiment.
Utilizability on the industry
The present invention relates to a kind of digital broadcasting transmission system and method thereof.
Claims (20)
1. digital broadcasting transmission system comprises:
The RS encoder is encoded to the dual transmission stream TS that comprises multiplexing together normal stream and a plurality of turbo stream;
Interleaver interweaves to the dual TS behind the coding;
The turbo processor detects turbo stream from the dual TS that interweaves, and detected turbo stream is encoded;
Trellis encoder is carried out puppet 2 (P-2) vestigial sideband VSB coding to the dual TS after the turbo processing, carries out grid coding then; And
Main multiplexer MUX by field sync signal and segment sync signal are added to the dual TS behind the grid coding, comes to carry out multiplexing to the dual TS behind the grid coding.
2. digital broadcasting transmission system according to claim 1 also comprises: the TS constructor, receive normal stream and a plurality of turbo stream, and described a plurality of turbo streams are handled, and structure comprises the dual TS of normal stream and described a plurality of turbo streams.
3. digital broadcasting transmission system according to claim 2, wherein, the TS constructor comprises:
Input MUX carries out multiplexing to described a plurality of turbo streams;
The RS encoder carries out the RS coding to the turbo stream after multiplexing;
Packet formatter re-constructs the bag that the turbo after RS encodes flows; And
TS MUX carries out multiplexing to the bag and the normal stream of the turbo stream behind the RS coding that re-constructs.
4. digital broadcasting transmission system according to claim 1, wherein, trellis encoder comprises: first encoder, carry out pseudo-2VSB coding to turbo stream; Second encoder carries out grid coding to the dual TS after first encoder encodes.
5. digital broadcasting transmission system according to claim 4, wherein, first encoder comprises:
The one MUX optionally exports in first input and second input;
First adder, with the output of a MUX and input addition from register, and the data of output gained;
The 2nd MUX optionally exports in first input and the output of first adder; And
The 3rd MUX optionally exports in second input and the output of a MUX.
6. digital broadcasting transmission system according to claim 5 also comprises: the control signal generator produces control signal, with the output of control from first to the 3rd MUX.
7. digital broadcasting transmission system according to claim 4, wherein, second encoder comprises:
First to the 3rd register, storing predetermined data;
Second adder will be from one in the output of first encoder storage data addition with first register, output gained data, and with the storage of output in first register; And
The 3rd adder will be from the storage data addition of another and second register in the output of first encoder, output gained data, and with the storage of output in the 3rd register.
8. digital broadcasting transmission system according to claim 7, wherein, the storage data of first register are imported into first encoder by second adder.
9. digital broadcasting transmission system according to claim 1 also comprises: replenish reference signal (SRS) inserter, additional reference signal is inserted into and will be imported among the dual TS of RS encoder.
10. digital broadcasting transmission system according to claim 1 also comprises: the parity check formatter, determine the position of Parity Check Bits in dual TS.
11. digital broadcasting transmission system according to claim 1, also comprise: can compatible parity check generator, producing by the interaction with trellis encoder can compatible Parity Check Bits, the described compatibility that can compatible Parity Check Bits be used for receiver apparatus.
12. a method for transmitting digital broadcasting comprises:
The dual transmission stream TS that comprises multiplexing together normal stream and a plurality of turbo stream is encoded;
Dual TS behind the coding is interweaved;
Detect turbo stream from the dual TS that interweaves, and detected turbo stream is encoded;
Dual TS after the turbo processing is carried out puppet 2 (P-2) vestigial sideband VSB coding, carry out grid coding then; And
By field sync signal and segment sync signal are added to the dual TS behind the grid coding, come to carry out multiplexing to the dual TS behind the grid coding.
13. method for transmitting digital broadcasting according to claim 12 also comprises:
Receive normal stream and a plurality of turbo stream;
Described a plurality of turbo streams are handled; And
Structure has the dual TS of normal stream and described a plurality of turbo streams.
14. method for transmitting digital broadcasting according to claim 13, wherein, the step of constructing dual TS comprises:
Carry out multiplexing to described a plurality of turbo streams;
Turbo stream after multiplexing is carried out the RS coding;
Re-construct the bag of the turbo stream after RS encodes; And
Bag and normal stream to the turbo stream behind the RS coding that re-constructs are carried out multiplexing.
15. method for transmitting digital broadcasting according to claim 12 comprises: will replenish reference signal and be inserted among the dual TS that comprises multiplexing together normal stream and a plurality of turbo stream that to be encoded.
16. method for transmitting digital broadcasting according to claim 12 also comprises: after the dual transmission stream TS that comprises multiplexing together normal stream and a plurality of turbo stream is encoded, determine the position of Parity Check Bits in dual TS.
17. method for transmitting digital broadcasting according to claim 12 also comprises: after grid coding, producing by the interaction with grid coding can compatible Parity Check Bits, the described compatibility that can compatible Parity Check Bits be used for receiver apparatus.
18. a digital broadcast receiving system comprises:
Demodulator receives the dual transmission stream TS that comprises normal stream and turbo stream that sends from digital broadcasting transmission system, detects synchronously according to the synchronizing signal of adding the baseband signal of giving TS, and TS is carried out demodulation;
Equalizer by to because the channel distortion that the multipath of channel causes compensates, comes the dual TS after the demodulation is carried out equilibrium;
The turbo decoder is decoded to the turbo stream after the equilibrium of dual TS;
Viterbi decoder carries out error correction to the normal stream of dual TS, the code element after the error correction decoded, and the output symbol bag;
Receiver multiplexer MUX carries out multiplexing to normal stream after the error correction and decoded turbo stream;
Deinterleaver deinterleaves to normal stream behind the Veterbi decoding and decoded turbo stream, and described then normal stream that deinterleaves and turbo stream are decoded by RS, go randomization, and are output;
The parity check eraser is removed the additional Parity Check Bits of giving the turbo stream after deinterleaving;
Second removes randomizer, and the turbo stream of having removed Parity Check Bits is gone randomization; And
Second demodulation multiplexer carries out demultiplexing to turbo stream.
19. system according to claim 18, wherein, the turbo decoder comprises:
Map decoder, turbo stream is carried out trellis decode, map decoder has outer deinterleaver, outer map decoder and external interleaver, the turbo stream of outer deinterleaver after to trellis decode deinterleaves, outer map decoder is carried out convolution decoder and is produced decoded data according to the convolution decoder result the turbo stream after deinterleaving, and the turbo stream of external interleaver after to convolution decoder interweaves; And
Frame formatter, the position of decoded data being added to the corresponding TS in position that flows with turbo.
20. system according to claim 19, wherein, when the outer deinterleaver of map decoder and external interleaver and outside when finishing information exchange between the map decoder, the decoded data of map decoder is output to be used for the reception of normal stream.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US75506806P | 2006-01-03 | 2006-01-03 | |
| US60/755,068 | 2006-01-03 | ||
| KR10-2006-0070917 | 2006-07-27 | ||
| KR1020060070917 | 2006-07-27 | ||
| KR1020060070917A KR100759898B1 (en) | 2006-01-03 | 2006-07-27 | Digital broadcasting transmission system and method |
| PCT/KR2006/005872 WO2007078121A1 (en) | 2006-01-03 | 2006-12-29 | Digital broadcasting transmission system and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101356819A CN101356819A (en) | 2009-01-28 |
| CN101356819B true CN101356819B (en) | 2011-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200680050391.1A Expired - Fee Related CN101356819B (en) | 2006-01-03 | 2006-12-29 | Digital broadcasting transmission system and method |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN101356819B (en) |
| CA (1) | CA2635234C (en) |
| WO (1) | WO2007078121A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288330A (en) * | 2000-08-25 | 2001-03-21 | 清华大学 | Ground digital multimedia TV broadcasting system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6754872B2 (en) * | 2000-05-22 | 2004-06-22 | Sarnoff Corporation | Method and apparatus for reducing channel distortion in a wireless communications network |
| US7406104B2 (en) * | 2000-08-25 | 2008-07-29 | Lin Yang | Terrestrial digital multimedia/television broadcasting system |
| US7529312B2 (en) * | 2002-10-25 | 2009-05-05 | The Directv Group, Inc. | Layered modulation for terrestrial ATSC applications |
-
2006
- 2006-12-29 WO PCT/KR2006/005872 patent/WO2007078121A1/en active Application Filing
- 2006-12-29 CN CN200680050391.1A patent/CN101356819B/en not_active Expired - Fee Related
- 2006-12-29 CA CA2635234A patent/CA2635234C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288330A (en) * | 2000-08-25 | 2001-03-21 | 清华大学 | Ground digital multimedia TV broadcasting system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101356819A (en) | 2009-01-28 |
| WO2007078121A1 (en) | 2007-07-12 |
| CA2635234A1 (en) | 2007-07-12 |
| CA2635234C (en) | 2016-05-24 |
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