CN1232117C - Transmitter for digital broadcasting system with comprehensive error correcting coding function and method thereof - Google Patents
Transmitter for digital broadcasting system with comprehensive error correcting coding function and method thereof Download PDFInfo
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- CN1232117C CN1232117C CNB031007309A CN03100730A CN1232117C CN 1232117 C CN1232117 C CN 1232117C CN B031007309 A CNB031007309 A CN B031007309A CN 03100730 A CN03100730 A CN 03100730A CN 1232117 C CN1232117 C CN 1232117C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
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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
- H03M13/2933—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 using a block and a convolutional code
- H03M13/2936—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 using a block and a convolutional code comprising an outer Reed-Solomon code and an inner convolutional 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
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
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Abstract
A transmission device and a transmission method of a digital broadcasting system having a complicated error correction coding function are provided to perform an error correction coding process for data transmitted through an HP(High Priority) layer and data transmitted through an LP(Low Priority) layer differently from each other, thereby efficiently transmitting digital broadcasting according to communication environments of a receiving device. First and second coders(112,122) output data coded by the unit of block to enable error correction respectively for first and second TSs(Transport streams). First and second outer interleavers(114,124) respectively re-align the data outputted from the first and the second coders(112,122). A convolution coder(116) performs convolution coding for the data outputted from the first outer interleaver(114) to output the coded data. A TCM(Trellis Coded Modulation) coder(126) performs TCM coding for the data outputted from the second outer interleaver(124) to output the coded data. An inner interleaver(128) respectively re-aligns and outputs the data outputted from the convolution coder(116) and from the TCM coder(126). And a modulation unit(140) modulates the data outputted from the inner interleaver(128) into digital data and transmits the modulated data.
Description
Technical field
The present invention relates to have the dispensing device and the method thereof of the digit broadcasting system of comprehensive error correcting coding function, be specifically related to have according to the transmitting layered of the digit broadcasting system of supporting the Delamination Transmission pattern dispensing device differently digit broadcasting system of the comprehensive error correcting coding function of coded data and method thereof.
Background technology
Compare with analog broadcasting, digital broadcasting is owing to having used digital encoding system to have the advantage of the system integration and interoperability.Utilize computer and network, the requirement of assembling (media convergence) core as so-called medium has been satisfied in digital broadcasting.In addition, the interactive features of digital broadcasting has greatly changed unidirectional analog broadcasting.
In order to guarantee the integrated and interoperability of digital broadcasting, at first, need the introducing standard.The transmission method that is used for Digital Terrestrial Television Broadcast of current proposition is the ATSC that utilizes 8-VSB (residual sideband) (Advanced Television Systems Committee) of the U.S. and the DVB-T based on COFDM (Coded Orthogonal Frequency Division Multiplexing (COFDM)) (digital video broadcasting-ground) in Europe.
Because digital broadcasting needs the compressed signal source to send lot of data, some mistakes in channel influence whole system considerably.Therefore, need to reduce the mistake that in channel, takes place.In order to reduce errors, can improve electrical power to improve signal noise ratio (SNR).But it has such as such problem, i.e. the cost of the raising that is caused by the interference of output of the height of big electrical power and dispensing device and interchannel.In order to alleviate these problems, digit broadcasting system uses error correcting code, and it makes mistake to be repaired and does not need to improve electrical power.Error correcting code can be corrected in the mistake that takes place in the channel and need not improve electrical power, has reduced the probability of the mistake that takes place in receiver.
Error correcting code mainly is divided into automatic repetitive requests (ARQ) and forward error correction (FEC).According to ARQ, if detect mistake in receiver, then receiver sends the signal that is used for the request repeat data to transmitter.Therefore, transmitter retransmission data.Because ARQ needs one to be used to allow the Return Channel of receiver to transmitter transmission re-send request may signal, so this method is not suitable for using in digital broadcasting.And according to FEC, signal is sent out with the additional code element that is added to signal, so that receiver can detect the mistake in channel and with algebraic method it be corrected subsequently.
FEC mainly is divided into block code and convolution code.Block code is unit encoding and decoded information with the piece, and it comprises Hamming code, BCH code and RS (Reed-Solomon) sign indicating number.In these sign indicating numbers, the RS sign indicating number is splendid on range performance, and comprises effective Code And Decode algorithm, therefore has been widely used in digit broadcasting system.The RS sign indicating number is superior aspect correction burst error, detects and correct mistake because it is unit with the piece.
Simultaneously, for convolution code, the output bit is easy to be subjected to over the influence of the bit of the bit of input and current input, and effective aspect the correction random error.Convolution code is called the Viterbi sign indicating number, because the decoder of convolution coder uses the Viterbi decoder usually.
Because the data of error correction need be sent out with the additional information that is used for error correction, therefore reduced the amount of information that each bandwidth can send.Therefore according to the sending method of recent research, for example, TCM (Trellis-coded modulation), coding and modulation function are combined into one, can obtain big coding advantage and do not need to reduce data transfer rates or improve bandwidth.
Fig. 1 is the block diagram that illustrates according to based on the dispensing device of the digital broadcasting of the DVB-T (digital video broadcast terrestrial TV) of COFDM.
Referring to Fig. 1, the dispensing device of digit broadcasting system comprises first and second scramblers 10 and 11, forward error correction (FEC) unit 30 and modulating unit 40.FEC unit 30 comprises first and second Reed-Solomons (RS) encoder 12 and 22, first and second outer interleaver 14 and 24, first and second convolution coders 16 and 26 and inner interleaver 28.Modulating unit 40 comprises pilot tone/system information insertion parts 41, mapping/OFDM modulating part 43, protection (GI) insertion parts 45, digital-to-analogue (D/A) converting member 47 and radio frequency (RF) parts 36 at interval.
Under the situation of DVB-T method, it supports the layering transfer mode.Under this situation, transmission stream (TS stream) separated device (not shown) of being imported is divided into high priority (HP) level and low priority (LP) level.A TS stream that sends by the HP level is imported into first scrambler 10, and the 2nd TS stream that sends by the LP level is imported into second scrambler 11.
The data value randomization that first and second scramblers 10 and 11 flow the first and second input TS in predetermined patterns.This is handled at receiver and is reversed execution so that the reduction original value.
It is the data of unit encoding with the piece that first and second outer interleaver 14 and 24 interweave in the first and second the first encoders 12 and 22, has therefore disperseed possible burst error.First and second convolution coders 16 and 26 are for being that unit carries out convolutional encoding with the piece in first and second outer interleaver 14 and 24 data that are interleaved.The general use of DVB-T method has the convolution code of constraint length 7 and encoding rate 1/2.
Again interweaved with output by inner interleaver 28 by convolution encoded data at first and second convolution coders 16 and 26.
For the coded data of 30 outputs from the FEC unit, modulating unit 40 is carried out the digital modulation of the sending method that is suitable for using in digit broadcasting system.As shown in Figure 1, under the situation of the OFDM that uses the DVB-T system, the data map of mapping/OFDM modulating part 43 interleaver 20 outputs internally is a code element such as QPSK (quarternary phase-shift keying (QPSK)), 16-QAM (quadrature amplitude modulation) and 64-QAM, and utilizes IFFT (contrary fast fourier transform) to carry out the OFDM modulation.In this process, pilot tone/system information insertion parts 41 is inserted the pilot signal be used for signal Synchronization and channel estimating and about the information of sending mode to signal.GI insertion parts 45 is inserted the GI that is used for the ISI (inter symbol interference) that prevents at multi-path environment.D/A converting member 47 is carried out digital-to-analogue (D/A) conversion for the signal that inserts GI.RF parts 49 amplify the signal of being changed by D/A with high frequency, and via the antenna transmission signal.
As mentioned above, the dispensing device of traditional digit broadcasting system mainly uses the code system of cascade, and described system uses the first and second the first encoders 12 and 22 as external encoder, uses first and second convolution coders 16 and 26 as internal encoder.Equally, the dispensing device of the digit broadcasting system of the Delamination Transmission pattern of support such as DVB-T uses for HP and LP level and uses the encoder of same procedure and the interleaver that interweaves with identical method execution.
As mentioned above, using for HP and LP level under the encoder of same procedure and the situation that interleaver is used to error correction coding, all can be received by the receiver with same structure by data that HP and LP level send.
But, may there be a kind of situation, use the receiver of HP level to be present under the different separately communication environments with the receiver that uses the LP level.In this case, carry out the efficiency of transmission that error correction coding can improve system respectively according to the environment of receiver.For example, the receiver under mobile environment receives the strong relatively HP signal of its receiving efficiency, and the receiver under rigid condition is received in and receives stronger LP signal aspect the multidata.For the data that send by the HP level, need carry out the error correction coding of more enhancing to improve receiving efficiency at receiver.For the data that send by the LP level, receiver need be configured to have transmission rate faster.Therefore, the dispensing device of digit broadcasting system need use different error correction/encoding methods according to layering according to the communication environment of receiver.
Summary of the invention
In order to solve the problems referred to above in prior art field, the present invention obtains exploitation.Therefore, an object of the present invention is to provide a kind of dispensing device and method thereof of digit broadcasting system, can be differently and data that send by the HP level and the data that send by the LP level of encoding compoundly, so that error correction.
The acquisition of above-mentioned purpose is by a kind of dispensing device of digit broadcasting system is provided, and comprising: first and second encoders, and being used for is that unit encodes with error correction to first and second input transfers streams (TS stream) with the piece respectively, and the data of output encoder; First and second outer interleaver are used for the data that interweave respectively and export from first and second encoders; Convolution coder is used for for the data execution convolutional encoding by the output of first outer interleaver, and the data of output encoder; Trellis-coded modulation (TCM) encoder is used for encoding to carrying out TCM by the data of second outer interleaver output, and the data of output encoder; Inner interleaver is used to interweave by the data of convolution coder output and the data of being exported by the TCM encoder, and exports the data that interweave; Modulating unit is used for digital modulation by the data of inner interleaver output and the data of transmission modulation.
Inner interleaver interweaves by the data of convolution coder output and the data of being exported by the TCM encoder with identical method.And inner interleaver also interweaves by the data of convolution coder output and the data of being exported by the TCM encoder with diverse ways.
Preferably, first and second encoders are to use Reed-Solomon (RS) encoder of Reed-Solomon code.Possible is that the first and second encoder utilizations have the RS sign indicating number of different size and carry out error correction coding.
Preferably, modulating unit uses OFDM (OFDM) modulation to come the combine digital modulation.In this case, modulating unit comprises: mapping/OFDM modulating part is used for by the data of mapping method mapping by inner interleaver output, and carries out the OFDM modulation; The system information insertion parts is used for being provided for the pilot signal of signal Synchronization and channel estimating and about the information of sending mode to mapping/OFDM modulating part; Protection is (GI) insertion parts at interval, is used for inserting a GI to the signal from the output of mapping/OFDM modulating part; Digital-to-analogue (D/A) converting member is used for the signal that inserts GI is carried out the D/A conversion; Radio frequency (RF) parts are used for the conversion of signals of D/A conversion is high-frequency signal and sends this signal.
Preferably, described dispensing device also comprises: separator is used for the TS stream of input is divided into the 2nd TS stream that will flow and will pass through the transmission of LP level by the TS that the HP level sends; First scrambler is used for the randomization of TS stream so that a TS to be provided to first encoder stream; Second scrambler is used for the randomization of the 2nd TS stream so that the 2nd TS to be provided to second encoder stream.
Simultaneously, comprise step: (a) be that unit flows (TS stream) for first and second input transfers and carries out coding respectively with error correction, and export first and second coded datas with the piece according to the sending method of digit broadcasting system of the present invention; (b) interweave respectively first and second coded datas and output first and second interleaving datas; (c) carry out convolutional encoding for first interleaving data; (d) carry out Trellis-coded modulation (TCM) coding for second interleaving data; (e) interweave again respectively convolution encoded data and TCM coded data; And (f) data that interweave again of digital modulation and send described data.
Step (e) is with identical method interweave convolution encoded data and TCM coded data.And step (e) is with diverse ways interweave convolution encoded data and TCM coded data.
Preferably, step (a) coding uses the data of Reed-Solomon code.Possible is that first and second data of coding use the RS sign indicating number with different size to encode with error correction in step (a).
Step (f) is utilized the modulation of OFDM (OFDM) modulation combine digital.In this case, step (f) comprises step: (f1) shine upon the data that interweave again and carry out the OFDM modulation with the predetermined mapped method; (f2) be provided for the pilot signal of signal Synchronization and channel estimating and about the information of sending mode to mapping/OFDM modulation step; (f3) insert protection (GI) at interval to signal from step (f2) output; (f4) carry out digital-to-analogue (D/A) conversion for the signal that inserts GI; (f5) conversion of signals with the D/A conversion is high-frequency signal and sends this signal.
Preferably, sending method also comprises step: the TS stream of input is divided into the 2nd TS stream that will flow and will pass through the transmission of LP level by the TS that the HP level sends; Randomization first and second TS stream is to provide the first and second randomized TS streams to step (a).
Description of drawings
By reference description of drawings the preferred embodiments of the present invention, above-mentioned purpose of the present invention and characteristics will become apparent, wherein:
Fig. 1 is the block diagram that the dispensing device of general digit broadcasting system is shown;
Fig. 2 is the block diagram that illustrates according to the dispensing device of the digit broadcasting system of the first embodiment of the present invention;
Fig. 3 is the flow chart of method of dispensing device that the digit broadcasting system of service chart 2 is shown;
Fig. 4 is the block diagram that illustrates according to the dispensing device of the digit broadcasting system of the second embodiment of the present invention;
Fig. 5 is the flow chart of method of dispensing device of the digit broadcasting system of service chart 4.
Embodiment
Below, be described in more detail the present invention with reference to accompanying drawing.
Fig. 2 is the block diagram that illustrates according to the dispensing device of the digit broadcasting system of the first embodiment of the present invention.
Referring to Fig. 2, mainly comprise first and second scramblers 110 and 111, forward error correction (FEC) unit 130 and modulating unit 140 according to the dispensing device of the digit broadcasting system of first embodiment.FEC unit 130 comprises first and second Reed-Solomons (RS) encoder 112 and 122, first and second outer interleaver 114 and 124, convolution coder 116, TCM (Trellis-coded modulation) encoder 126 and inner interleaver 128.Modulating unit 140 comprises pilot tone/system information insertion parts 141, mapping/OFDM modulating part 143, protection (GI) insertion parts 145, digital-to-analogue (D/A) converting member 147 and radio frequency (RF) parts 149 at interval.
According to first embodiment, the dispensing device of digit broadcasting system is supported the layering transfer mode, and therefore will transmit stream (TS stream) by the separator (not shown) is divided into high priority (HP) level and low priority (LP) level.A TS stream that sends by HP priority is imported into first scrambler 110, and the 2nd TS stream that sends by the LP level is imported into second scrambler 111.
First and second scramblers 110 and 111 are the data value of the randomization first and second input TS streams in predetermined patterns.That is,, eliminated the correlation between input signal by the pseudo-random binary sequence scrambler is flowed for input TS.This is will prevent during synchrodata sends because the problem of the missed synchronization that causes such as the repetition numeral of 00000000b or 11111111b.This is handled at receiver and is reversed execution with the reduction raw value.
The 130 pairs of data by first and second scramblers 110 and 111 inputs in FEC unit are carried out coding, to be corrected in the mistake that takes place during data send.That is, the first and second RS encoders 112 and 122 are that unit is for carrying out the RS coding by the data of first and second scramblers 110 and 111 outputs, to correct mistake with the piece.RS coding adds parity check code with error correction, by the big or small mutually the same of the first and second RS encoders 112 and 122 parity check codes that add or differ from one another.
First and second outer interleaver 114 and 124 pairs of data from the first and second RS encoders 112 and 122 outputs are carried out byte-interleaved.
Convolution coder 116 is for the data execution convolutional encoding from 114 outputs of first outer interleaver, and TCM encoder 126 is for carrying out the TCM coding from the data of second outer interleaver, 124 outputs.Convolution encoded data and TCM coded data are interweaved again by inner interleaver 128 and are output to modulating unit 140.Inner interleaver 128 can comprise a bit interleaver and a symbol interleaver.Described bit interleaver is carried out in the data block that might carry out Bit Interleave and is interweaved.Under the situation of OFDM, it is a symbol unit that effective subcarrier that described symbol interleaver will exist in the OFDM code element interweaves.
For the coded data of interleaver 128 outputs internally, modulating unit 140 is carried out the digital modulation of the sending method that is suitable for described digit broadcasting system.Fig. 2 shows the modulating unit 140 of carrying out modulation according to the OFDM method of DVB-T system with example.
In this case, the data map of the mapping of modulating unit 140/OFDM modulating part 143 interleaver 128 outputs internally is a code element such as QPSK (quarternary phase-shift keying (QPSK)), 16-QAM (quadrature amplitude modulation) and 64-QAM, and carries out the OFDM modulation.In this process, pilot tone/system information insertion parts 141 is inserted the pilot signal that is used for signal Synchronization and channel estimating and about the information of sending mode.GI insertion parts 145 is inserted the protection (GI) at interval that is used for the ISI (inter symbol interference) that prevents at multi-path environment.And D/A converting member 147 is carried out digital-to-analogue (D/A) conversion for the signal that inserts GI, and RF parts 149 amplify the signal of D/A conversion with high frequency, and via the antenna transmission signal.
Fig. 3 illustrates the flow chart of method that moves the dispensing device of digit broadcasting system shown in Figure 2 according to the present invention.
Referring to described flow chart, the transmission of input stream (TS stream) separated device (not shown) is divided into and will flows and will pass through the 2nd TS stream (S300 and S302) that low priority (LP) level sends by the TS that high priority (HP) level sends.When TS stream was sent out by the HP level, a TS stream of being divided by separator was imported into first scrambler, 110, the first scramblers, 110 execution scramblers with randomization the one TS stream (S304).
The one RS encoder 112 is that unit is for being carried out the RS coding by the data of first scrambler, 110 scramblers with error correction (S306) with the piece.
Reed-Solomon (RS) sign indicating number is the nonbinary block code different with other yards, so it does not comprise binary number 0 or 1, but comprise nonbinary several 0,1 ..., 2
M-1According to the RS coding, comprise that a piece of k input symbols is encoded as a piece with n code symbols, wherein n is greater than k.Therefore, n-k redundancy symbol is coupled with, and this is called the Reed-Solomon parity check code.The quantity of the parity check code that is added by RS coding depends on transmission method, and for example the code element of each 188 byte is 16 or 20.Receiver is by using the accuracy of the definite data that received of parity check code that add.If the result who determines as accuracy detects a mistake, then receiver is searched for the position of mistake, corrects the data and the primary signal of reducing of distortion.Generally, the code element of half quantity of the parity check code that adds is reduced, and impossible reduction is more than the code element of half quantity of parity check code.
First outer interleaver 114 is for being that the data that unit is encoded are carried out outer interleaved (S308) with the piece at first encoder 112.By in the whole bag of tricks of first outer interleaver, 114 interleaving datas, as use convolutional deinterleaver.The basic function of described interleaver is to disperse burst error to greatest extent.
Convolution coder 116 is for carrying out convolutional encoding from the data of first outer interleaver, 114 outputs.The line of input that convolution code is used for the k bit that each is continuous is encoded to n output bit, and coding comprises the convolution of input bit and binary pulse response.The DVB-T transmission method uses the convolutional coding method with constraint length 7 and encoding rate 1/2.At this, encoding rate can change, and for example 2/3,3/4,5/6 and 7/8.
Inner interleaver 128 interweaves (S322) for being carried out by convolution coder 116 convolution encoded data, has therefore improved the mis-behave that is caused by multipath.As mentioned above, for the coded data that is used for error correction, modulating unit 140 is carried out and is suitable for the digital modulation of transfer of data and sends data (S330).
And when sending input TS stream by the LP level when, the 2nd TS stream of being divided by separator is imported into second scrambler 111 and by second scrambler, 111 scramblers (S314).By the data of scrambler by the 2nd RS encoder 122RS coding (S316).The size of the parity check code that adds during the RS of the 2nd RS encoder 122 coding equals or is not equal to a RS encoder 112.
Second outer interleaver 124 interweaves by the 2nd RS encoder 122 coded datas (S318), has therefore disperseed the possible burst error that takes place in channel.
TCM encoder 126 is carried out the TCM coding with error correction (S320) for the data that interweaved by second outer interleaver 124.
The TCM (Trellis-coded modulation) that is proposed by Underboeck unites two into one encoding function and modulation function obtaining to encode greatly advantage, and need not reduce data transfer rates or improve bandwidth.Use the reasons are as follows of TCM.
Because error correction coding sends data with the error correcting code that is added to data, therefore reduced the data volume that each bandwidth can send.Therefore, in order to keep the transfer rate of data consistently, need more bandwidth when being sent out than not encoding when data.If limited bandwidth then needs to use the modulator approach that is used for effective utilized bandwidth.But for having the limited bandwidth and the dispensing device of power, situation often is to be difficult to obtain desired performance by encoding respectively and modulating.In order to address this problem, after deliberation a kind of communication means that is used for assembly coding and modulation, its example is TCM.TCM carries out convolutional encoding and modulation by single operation.Therefore, compare with the data that wherein received decoded general receiver after demodulation, the TCM receiver is carried out the demodulation sign indicating number once by making up them.
Be sent to inner interleaver 128 by TCM encoder 126 coded datas.The data (S322) that inner interleaver 128 interweaves and is sent out.For the data that interweaved by inner interleaver 128, modulating unit 140 is carried out and is suitable for the digital modulation that data send, and via antenna transmission data (S330).
As mentioned above, might encode the data that send by the HP level and the data by the transmission of LP level with error correction differently and compound.
Fig. 4 is the block diagram that illustrates according to the dispensing device of the digit broadcasting system of the second embodiment of the present invention.
Referring to Fig. 4, the dispensing device of digit broadcasting system comprises first and second scramblers 210 and 211, forward error correction (FEC) unit 230 and modulating unit 240.FEC unit 230 comprises first and second Reed-Solomons (RS) encoder 212 and 222, first and second outer interleaver 214 and 224, convolution coder 216, Trellis-coded modulation (TCM) encoder 226 and first and second inner interleaver 218 and 228.Modulating unit 240 comprises pilot tone/system information insertion parts 241, mapping/OFDM modulating part 243, protection (GI) insertion parts 245, digital-to-analogue (D/A) converting member 247 and radio frequency (RF) parts 249 at interval.
Dispensing device according to the broadcast system of the second embodiment of the present invention is with the different of first embodiment, has used two inner interleaver, i.e. first and second inner interleaver 218 and 228.Therefore, interweaved respectively by diverse ways by convolution coder 216 coded datas with by TCM addressable part 226 coded datas.The function of miscellaneous part is basically the same as those in the first embodiment.
Fig. 5 is the flow chart of method of dispensing device of the digit broadcasting system of service chart 4.
Referring to Fig. 5, the dispensing device of second embodiment is with the different of Fig. 3, interweaved (S410 and S412) by first interleaver 218 from the data of convolution coder 216 output, from the data of TCM encoder 226 outputs by second interleaver 228 interweave (S420 and S422).That is,, interweaved respectively by diverse ways from the data of convolution coder 216 outputs and the data of exporting from TCM encoder 226 according to second embodiment.Other steps are identical with Fig. 3's.
As mentioned above, to data that send by the HP level and the different error correcting code of data allocations that sends by the LP level, and carry out different interweaving according to the dispensing device of digit broadcasting system of the present invention.Therefore, because differently coded data is with error correction according to sending level, the effective transmission that therefore is suitable for the communication environment of receiver is possible.
In addition, the above embodiments use OFDM to be used as modulator approach by example, but this should not be taken as qualification.The present invention can be applied to the traditional various dispensing devices of digital broadcasting and no matter employed modulator approach how, and can provide the data of the best of the communication environment that is suitable for receiver to send.
As mentioned above, for by the data of HP level transmission and the data that send by the LP level, carry out different error correction/encoding methods.Therefore, according to the communication environment of receiver, it is possible that the valid data of digital broadcasting send.
The above embodiments and advantage only are exemplary, can not be as limitation of the invention.This study course can easily be applied to the device of other types.Explanation of the present invention is illustrative, does not limit the scope of claim.Many to one skilled in the art replacement forms, improvement and variation are obvious.In claims, device adds the function clause and attempts to cover the structure that this is described as carrying out the function of enumerating, the not only coordinate of structure, and equal structure.
Claims (22)
1. the dispensing device of a digit broadcasting system comprises:
First and second encoders, being used for is that unit encodes with error correction to first and second input transfers stream with the piece respectively, and the data of output encoder;
First and second outer interleaver are used for the data that interweave respectively and export from first and second encoders;
Convolution coder is used for for the data execution convolutional encoding by the output of first outer interleaver, and the data of output encoder;
The Trellis-coded modulation encoder is used for encoding to carrying out Trellis-coded modulation by the data of second outer interleaver output, and the data of output encoder;
Inner interleaver is used to interweave by the data of convolution coder output and the data of being exported by the Trellis-coded modulation encoder, and exports the data that interweave; And
Modulating unit is used for digital modulation by the data of inner interleaver output and the data of transmission modulation.
2. according to the dispensing device of claim 1, wherein first and second encoders are to use the Reed-Solomon encoder of Reed-Solomon code.
3. according to the dispensing device of claim 2, wherein the first and second encoder utilizations have the Reed-Solomon code execution error correction coding of different size.
4. according to the dispensing device of claim 1, wherein modulating unit uses OFDM to modulate the combine digital modulation.
5. according to the dispensing device of claim 4, wherein modulating unit comprises:
Mapping/OFDM modulating part is used for by the data of mapping method mapping by inner interleaver output, and carries out the OFDM modulation;
Pilot tone/system information insertion parts is used for being provided for the pilot signal of signal Synchronization and channel estimating and about the information of sending mode to mapping/OFDM modulating part;
Protection is insertion parts at interval, is used for inserting a protection at interval to the signal from the output of mapping/OFDM modulating part;
The digital-to-analogue conversion parts are used for carrying out digital-to-analogue conversion to inserting protection signal at interval; And
Radio-frequency unit is used for the conversion of signals of digital-to-analogue conversion is high-frequency signal and sends this signal.
6. according to the dispensing device of claim 1, also comprise:
First scrambler is used for transmitting the stream randomization to provide first to transmit stream to first encoder with first;
Second scrambler is used for transmitting the stream randomization to provide second to transmit stream to second encoder with second.
7. the dispensing device of a digit broadcasting system comprises:
First and second encoders, being used for is that unit encodes with error correction to first and second input transfers stream with the piece respectively, and the data of output encoder;
First and second outer interleaver are used for the data that interweave respectively and export from first and second encoders;
Convolution coder is used for for the data execution convolutional encoding by the output of first outer interleaver, and the data of output encoder;
The Trellis-coded modulation encoder is used for encoding to carrying out Trellis-coded modulation by the data of second outer interleaver output, and the data of output encoder;
First inner interleaver is used to the data that interweave and exported by convolution coder;
Second inner interleaver is used to interweave by the data of Trellis-coded modulation encoder output, and the data of output encoder; And
Modulating unit is used for digital modulation by the data of inner interleaver output and the data of transmission modulation.
8. according to the dispensing device of claim 7, wherein first and second encoders are to use the Reed-Solomon encoder of Reed-Solomon code.
9. according to the dispensing device of claim 8, wherein the first and second encoder utilizations have the Reed-Solomon code execution error correction coding of different size.
10. according to the dispensing device of claim 7, wherein first and second inner interleaver are with identical method interleaving data.
11. according to the dispensing device of claim 7, wherein first and second inner interleaver are with the diverse ways interleaving data.
12. according to the dispensing device of claim 7, wherein modulating unit uses OFDM to modulate the combine digital modulation.
13. according to the dispensing device of claim 12, wherein modulating unit comprises:
Mapping/OFDM modulating part is used for by the data of mapping method mapping by inner interleaver output, and carries out the OFDM modulation;
Pilot tone/system information insertion parts is used for being provided for the pilot signal of signal Synchronization and channel estimating and about the information of sending mode to mapping/OFDM modulating part;
Protection is insertion parts at interval, is used for inserting a protection at interval to the signal from the output of mapping/OFDM modulating part;
The digital-to-analogue conversion parts are used for carrying out digital-to-analogue conversion to inserting protection signal at interval; And
Radio-frequency unit is used for the conversion of signals of digital-to-analogue conversion is high-frequency signal and sends this signal.
14. the dispensing device according to claim 7 also comprises:
First scrambler is used for transmitting the stream randomization to provide first to transmit stream to first encoder with first;
Second scrambler is used for transmitting the stream randomization to provide second to transmit stream to second encoder with second.
15. the sending method of a digit broadcasting system comprises step:
(a) be that unit does not carry out coding with error correction for the first and second input transfer flow points with the piece, and export first and second coded datas;
(b) interweave respectively first and second coded datas and output first and second interleaving datas;
(c) carry out convolutional encoding for first interleaving data;
(d) carry out the Trellis-coded modulation coding for second interleaving data;
(e) interweave again respectively convolution encoded data and Trellis-coded modulation coded data; And
(f) data that interweave again of digital modulation and send described data.
16. according to the sending method of claim 15, wherein step (e) is with identical method interweave convolution encoded data and Trellis-coded modulation coded data.
17. according to the sending method of claim 15, wherein step (e) is with diverse ways interweave convolution encoded data and Trellis-coded modulation coded data.
18. according to the sending method of claim 16, wherein step (a) is used the Reed-Solomon code coded data.
19. according to the sending method of claim 18, wherein first and second coded datas use the Reed-Solomon code with different size to encode with error correction in step (a).
20. according to the sending method of claim 15, wherein step (f) is utilized the modulation of OFDM modulation combine digital.
21. according to the sending method of claim 20, wherein step (f) comprises step:
(f1) shine upon the data that interweave again and carry out the OFDM modulation with the predetermined mapped method;
(f2) be provided for the pilot signal of signal Synchronization and channel estimating and about the information of sending mode to mapping/OFDM modulation step;
(f3) insert protection at interval to signal from step (f2) output;
(f4) carry out digital-to-analogue conversion for inserting protection signal at interval; And
(f5) conversion of signals with digital-to-analogue conversion is high-frequency signal and sends this signal.
22., also comprise step according to the sending method of claim 15:
Randomization first and second transmits stream and provides the described first and second randomized transmission streams to step (a) respectively.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR63522/02 | 2002-10-17 | ||
| KR63522/2002 | 2002-10-17 | ||
| KR1020020063522A KR20040034878A (en) | 2002-10-17 | 2002-10-17 | Apparatus and method for transmission of digital broadcasting system which has the composition error correction encoder |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005101094030A Division CN1758745A (en) | 2002-10-17 | 2003-01-17 | Dispensing device and method with digit broadcasting system of comprehensive error correcting coding function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1491031A CN1491031A (en) | 2004-04-21 |
| CN1232117C true CN1232117C (en) | 2005-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031007309A Expired - Fee Related CN1232117C (en) | 2002-10-17 | 2003-01-17 | Transmitter for digital broadcasting system with comprehensive error correcting coding function and method thereof |
| CNA2005101094030A Pending CN1758745A (en) | 2002-10-17 | 2003-01-17 | Dispensing device and method with digit broadcasting system of comprehensive error correcting coding function |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005101094030A Pending CN1758745A (en) | 2002-10-17 | 2003-01-17 | Dispensing device and method with digit broadcasting system of comprehensive error correcting coding function |
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| Country | Link |
|---|---|
| KR (1) | KR20040034878A (en) |
| CN (2) | CN1232117C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100920738B1 (en) * | 2002-10-19 | 2009-10-07 | 삼성전자주식회사 | Apparatus and method for transmission of digital broadcasting system having different error correction coding process according to communication environment |
| KR100927144B1 (en) * | 2002-10-19 | 2009-11-18 | 삼성전자주식회사 | Apparatus and method for transmission of digital broadcasting system which has the inner interleaver of improving randomization |
| KR100683879B1 (en) * | 2004-05-06 | 2007-02-15 | 삼성전자주식회사 | Digital broadcasting transmission/reception capable of improving receiving performance and signal processing method thereof |
| CA2679049C (en) * | 2004-05-13 | 2015-03-24 | Samsung Electronics Co., Ltd. | Digital broadcasting transmission/reception devices capable of improving a receiving performance and signal processing method thereof |
| KR100793481B1 (en) * | 2005-11-07 | 2008-01-14 | 엘지전자 주식회사 | Apparatus and method for transmitting multimedia object in digital multimedia broadcasting |
| KR101445340B1 (en) * | 2007-06-01 | 2014-09-29 | 삼성전자주식회사 | OFDM transmitting/receiving device for transmitting/receiving OFDM symbol comprising symbols intereaved variably, and methods thereof |
| JP6278275B2 (en) * | 2012-06-04 | 2018-02-14 | パナソニックＩｐマネジメント株式会社 | TRANSMISSION DEVICE, RECEPTION DEVICE, TRANSMISSION METHOD, AND RECEPTION METHOD |
-
2002
- 2002-10-17 KR KR1020020063522A patent/KR20040034878A/en not_active Application Discontinuation
-
2003
- 2003-01-17 CN CNB031007309A patent/CN1232117C/en not_active Expired - Fee Related
- 2003-01-17 CN CNA2005101094030A patent/CN1758745A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR20040034878A (en) | 2004-04-29 |
| CN1491031A (en) | 2004-04-21 |
| CN1758745A (en) | 2006-04-12 |
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