CN1852282A - Channel decoding and symbol demapping synchronizing method - Google Patents
Channel decoding and symbol demapping synchronizing method Download PDFInfo
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- CN1852282A CN1852282A CNA2006100259914A CN200610025991A CN1852282A CN 1852282 A CN1852282 A CN 1852282A CN A2006100259914 A CNA2006100259914 A CN A2006100259914A CN 200610025991 A CN200610025991 A CN 200610025991A CN 1852282 A CN1852282 A CN 1852282A
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Abstract
Based on position of preset information, the invention determines original positions of de-mapped channel symbol, decoded channel TPC, decoded channel RS or decoded channel NR. Based on the said original positions, the system realizes synchronization of de-mapped symbol, decoded channel TPC, decoded channel RS and decoded channel NR so as to complete de-mapped symbol, decoded channel TPC, decoded channel RS or decoded channel NR. Since spread spectrum protection is carried out for preset information, entire synchronization process can still be accomplished under condition in larger interference and before equilibrium.
Description
Technical field
The present invention relates to a kind of method of digital signal transmission technique field, relate in particular to a kind of method for synchronous that is applicable to decoding of DTB Digital Terrestrial Broadcasting channel transmitted and symbol de-maps.
Background technology
Wireless transmitting system comprises transmitter and receiver.Fig. 1 is typical digital radio system for transmitting block diagram, and transmission course comprises: at transmitting terminal, at first to encoding digital signals, add necessary supplementary again, as synchronous signal, pilot signal etc.; Digital signal behind the coding forms baseband signal through behind the channel filtering; This baseband signal sends after being modulated onto frequency band corresponding through up converter.At receiving terminal, if tuner is arranged, then down-conversion needn't be arranged, tuner transforms to base band after analog to digital converter obtains digital signal with high-frequency signal; This digital signal is resumed the information consistent with transmitting terminal after treatment.
In the ADTB-T system, the Frame of transmission different business can select to adopt different transmission modes.The pairing chnnel coding structure of the terrestrial transmission pattern of four kinds of code checks as shown in Figure 2.
The transmission method of signal is such in digital tv ground broadcasting (ADTB-T): the data flow of transmitting in the digital transmission system of being made up of many level symbols is divided into continuous one by one Frame and transmits; Each Frame comprises 3 parts, is respectively preset information, system information and data message, and forms simple single order circulation with this.Specifically describe this frame structure in the Chinese patent " method for transmitting signals in the digital television ground broadcast transmission system " (patent No. 200410039115.8), Fig. 3 has shown the high code check 32-OQAM that the ADTB-T system adopts, 16-OQAM, in the object lesson of frame structure of code check 4-OQAM and low code check 4-OQAM-E, wherein preset information increases 1 two level deterministic signals by 2047 PN sequence and realizes; System information comprises the data message of 32768 symbols by an expression in the system information vector of 256 128 two level symbol sequences in each Frame.
Under above-mentioned 32-OQAM, 16-OQAM, 4-OQAM and four kinds of transmission modes of 4-OQAM-E during the system transmissions signal, all to carry out symbol de-maps at receiving terminal in to the Signal Processing process, how this determines data are carried out the original position that symbol de-maps is handled if just relating to, just how to realize the stationary problem of symbol de-maps.Under each transmission mode during the system transmissions signal, all to carry out channel TPC decoding in to the Signal Processing process at receiving terminal; In, low code check transmission mode, to carry out channel RS decoding at receiving terminal in to the Signal Processing process; Low code check transmission mode will be carried out channel NR decoding at receiving terminal in to the Signal Processing process; Same, also relate to original position how to determine data are carried out channel TPC decoding, RS decoding, NR decoding processing, the stationary problem of the channel TPC decoding that just how to realize, the stationary problem of channel RS decoding, and the stationary problem of channel NR decoding.
Find through literature search prior art, in the disclosed patent No. of 2003.07.23 " is carrying out making when radio broadcasting transmits the method for OFDM sign synchronization " for the Chinese patent of " CN01810207.7 ", proposed to be used in the method for multi-carrier OFDM systems.But this method can not be used to belong to the ADTB-T system of single carrier category.At the ADTB-T system, need formulate distinctive method for synchronous according to system.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, the method for synchronous of a kind of channel-decoding and symbol de-maps is provided.The present invention can realize respectively channel TPC decoding synchronously, channel RS decoding synchronously, channel NR decoding synchronously and symbol de-maps synchronously.Method of the present invention goes in the digital tv ground broadcasting (ADTB-T).
The objective of the invention is to be achieved through the following technical solutions:
The data flow of being made up of many level symbols of transmission system transmission is divided into continuous one by one Frame and transmits; Each Frame comprises the preset information that can be used as system synchronization, clock recovery, channel estimating and equalizer training, can be used for characterizing the system information of this frame of data information transmission mode, and this three part of data message, and form the circulation of simple single order with this, described preset information realized by the two level deterministic signals that the PN sequence of m position increases the n position, wherein m and n and be necessary for 2 power power;
At the transmission system receiving terminal, when carrying out the symbol de-maps processing, by detecting the position of determining preset information, with first symbol clock position after this preset information to not separating the mapped data information flow, as the original position of symbol de-maps, data message is afterwards made symbol de-maps.At real system, when carrying out symbol de-maps synchronous, can get described m is 2047, and n is 1, and k is 32896, and N is 3.
The invention provides a kind of method for synchronous of channel-decoding, the data flow of being made up of many level symbols of transmission system transmission is divided into continuous one by one Frame and transmits; Each Frame comprises the preset information as system synchronization, clock recovery, channel estimating and equalizer training, be used to characterize the system information of this frame of data information transmission mode, and this three part of data message, and form the circulation of simple single order with this, described method comprises:
The two level deterministic signals that increased the n position by the PN sequence of m position realize described preset information, wherein m and n's and be 2 power power;
At the transmission system receiving terminal, when data message stream is carried out the channel-decoding processing, by detecting the position of determining preset information, with first symbol clock position after this preset information, as the original position of channel-decoding, data message is afterwards made channel-decoding.
The method for synchronous of the above-mentioned channel-decoding of the present invention is applicable to DTB Digital Terrestrial Broadcasting channel transmitted TPC decoding, channel RS decoding or channel NR decoding.Described m is 2047, and n is 1, and k is 32896, and N is 3.
The method for synchronous of channel-decoding of the present invention and symbol de-maps can use asynchronous correlator to determine the position of preset information, the steps include:
At the transmission system receiving terminal asynchronous correlator is set, with this asynchronous correlator of data flow serial input that receives, when this asynchronous correlator output valve is autocorrelation value (when being maximum), begin counting, if N continuous time when asynchronous correlator output valve all be autocorrelation value when the individual timeticks of interval k (k is the number of symbols sum of number of symbols with the expression data message of expression system information in the transmission system Frame), is determined the end position that transmit for preset information in this frame this position.Above-mentioned N can get positive integers such as 1,2,3,4.
The inventive method determines that according to the position of preset information channel symbol is separated mapping, channel TPC decoding, channel RS decodes or the original position of channel NR decoding, system can according to this original position realize symbol de-maps synchronously, channel TPC decoding synchronously, channel RS decoding synchronously and channel NR decoding synchronously, finish respectively and separate sign map, channel TPC decoding, channel RS decoding or channel NR decoding.
The present invention is with respect to the synchronous catching method of 4 level section among the ATSC, and the method for this PN related synchronization has acquisition speed faster, and simultaneously, because the gain that PN is correlated with is very big, antijamming capability is stronger.
Description of drawings
Fig. 1 is the system block diagram of typical Digital Transmission
Fig. 2 is an ADTB-T system channel coding structured flowchart
Fig. 3 is high code check 32-OQAM, 16-OQAM, the frame structure of middle code check 4-OQAM and low code check 4-OQAM-E
Fig. 4 is asynchronous correlator configuration figure
Fig. 5 separates the flow chart of mapping for synchronizing symbol
Embodiment
With embodiment the present invention is described further with reference to the accompanying drawings below
The method for synchronous of channel-decoding of the present invention and symbol de-maps can be applied to digital tv ground broadcasting (ADTB-T).Present embodiment is disclosed promptly to be the concrete application of method of the present invention in the ADTB-T system, in present embodiment non-limiting examples of suitable DTB-T systems technology scheme, the data flow of being made up of many level symbols of transmission system transmission is divided into continuous one by one Frame and transmits; Each Frame comprises the preset information that can be used as system synchronization, clock recovery, channel estimating and equalizer training, can be used for characterizing the system information of this frame of data information transmission mode, and this three part of data message, and forms simple single order circulation with this.
The transmission system that adopts above-mentioned frame structure is carried out channel-decoding in the present invention and the synchronous method of symbol de-maps is:
At the transmission system receiving terminal asynchronous correlator is set, is used for detecting the position of preset information, Fig. 4 is the structure chart of asynchronous correlator.
Make referrals in background technology, in the technical scheme of ADTB-T system, under each code check transmission mode, receiving terminal is to receive data flow and it is separated to be in harmonious proportion to go just data flow to be done symbol de-maps after pilot tone handles; The synchronous process that realizes symbol de-maps is:
At receiving terminal, with receive do not separate the mapped data information flow at first serial import asynchronous correlator, described asynchronous correlator is in running order all the time, when asynchronous correlator output valve is autocorrelation value (being maximum), begin counting, if continuous 3 times when 32896 timeticks at interval asynchronous correlator output valve be autocorrelation value all, determine that this position is the end position that preset information transmits.With first symbol clock position behind this position is starting point, and data message is afterwards made symbol de-maps.
Fig. 5 separates the flow chart of mapping for synchronizing symbol.
Same method can be applied in the synchronizing channel TPC decoding.
Make referrals in background technology, in the technical scheme of ADTB-T system, under each code check transmission mode, receiving terminal is that the data message stream of input is separated after Bit Interleave handles, and does channel TPC decoding; The synchronous process that realizes channel TPC decoding is:
At receiving terminal, with receive without the data message stream of TPC decoding at first serial import asynchronous correlator, described asynchronous correlator is in running order all the time, when asynchronous correlator output valve is autocorrelation value (being maximum), begin counting, if continuous 3 times when 32896 timeticks at interval asynchronous correlator output valve be autocorrelation value all, determine that this position is the end position that preset information transmits.With first symbol clock position behind this position is starting point, and data message is afterwards done channel TPC decoding.
Same method can be applied in the synchronizing channel NR decoding.
Make referrals in background technology, in the technical scheme of ADTB-T system, under the low code check transmission mode, receiving terminal is that the data message stream to input carries out symbol de-maps and conciliates symbol interleaving (optional) afterwards, does channel NR decoding; The synchronous process that realizes channel NR decoding is:
At receiving terminal, with receive without the data message stream of NR decoding at first serial import asynchronous correlator, described asynchronous correlator is in running order all the time, when asynchronous correlator output valve is autocorrelation value (being maximum), begin counting, if continuous 3 times when 32896 timeticks at interval asynchronous correlator output valve be autocorrelation value all, determine that this position is the end position that preset information transmits.With first symbol clock position behind this position is starting point, and data message is afterwards done channel NR decoding.
Same method can be applied in the synchronizing channel RS decoding.
In background technology, make referrals to, in the technical scheme of ADTB-T system, in, under the low code check transmission mode, receiving terminal is that the data message stream to input carries out channel TPC decoding and conciliates after the byte-interleaved, does channel RS decoding; The synchronous process that realizes channel RS decoding is:
At receiving terminal, with receive without the data message stream of RS decoding at first serial import asynchronous correlator, described asynchronous correlator is in running order all the time, when asynchronous correlator output valve is autocorrelation value (being maximum), begin counting, if continuous 3 times when 32896 timeticks at interval asynchronous correlator output valve be autocorrelation value all, determine that this position is the end position that preset information transmits.With first symbol clock position behind this position is starting point, and data message is afterwards done channel RS decoding.
Claims (9)
1, a kind of method for synchronous of symbol de-maps, the data flow of being made up of many level symbols of transmission system transmission is divided into continuous one by one Frame and transmits; Each Frame comprises the preset information as system synchronization, clock recovery, channel estimating and equalizer training, be used to characterize the system information of this frame of data information transmission mode, and this three part of data message, and form the circulation of simple single order with this, it is characterized in that, the two level deterministic signals that increased the n position by the PN sequence of m position realize, wherein m and n's and be 2 power power;
At the transmission system receiving terminal, when data message stream is carried out the symbol de-maps processing, by detecting the position of determining preset information, with first symbol clock position after this preset information, as the original position of symbol de-maps, data message is afterwards made symbol de-maps.
2, the method for synchronous of symbol de-maps as claimed in claim 1 is characterized in that, the position of described preset information uses asynchronous correlator to determine that step comprises:
The transmission system receiving terminal is provided with the asynchronous correlator that is used to detect the preset information position;
With this asynchronous correlator of data flow serial input that receives, when this asynchronous correlator output valve is autocorrelation value, begin counting, if N continuous is when time asynchronous correlator output valve all is autocorrelation value when interval k timeticks, determine the end position of this position for preset information transmission in this frame, described k is system information and a data message symbolic number sum in the transmission system Frame.
3, the method for synchronous of symbol de-maps as claimed in claim 1 is characterized in that: described m is 2047, and n is 1.
4, the method for synchronous of symbol de-maps as claimed in claim 2 is characterized in that: described k is 32896, and N is 3.
5, a kind of method for synchronous of channel-decoding, the data flow of being made up of many level symbols of transmission system transmission is divided into continuous one by one Frame and transmits; Each Frame comprises the preset information as system synchronization, clock recovery, channel estimating and equalizer training, be used to characterize the system information of this frame of data information transmission mode, and this three part of data message, and form simple single order circulation with this, it is characterized in that described method comprises:
The two level deterministic signals that increased the n position by the PN sequence of m position realize described preset information, wherein m and n's and be 2 power power;
At the transmission system receiving terminal, when data message stream is carried out the channel-decoding processing, by detecting the position of determining preset information, with first symbol clock position after this preset information, as the original position of channel-decoding, data message is afterwards made channel-decoding.
6, the method for synchronous of channel-decoding according to claim 5 is characterized in that, is applicable to channel TPC decoding, channel RS decoding, the channel NR decoding of digital TV ground transmission.
7, the method for synchronous of channel-decoding as claimed in claim 5 is characterized in that, the position of described preset information uses asynchronous correlator to determine that step comprises:
The transmission system receiving terminal is provided with the asynchronous correlator that is used to detect the preset information position;
With this asynchronous correlator of data flow serial input that receives, when this asynchronous correlator output valve is autocorrelation value, begin counting, if N continuous is when time asynchronous correlator output valve all is autocorrelation value when interval k timeticks, determine the end position of this position for preset information transmission in this frame, described k is system information and a data message symbolic number sum in the transmission system Frame.
8, the method for synchronous of channel-decoding as claimed in claim 5 is characterized in that, described m is 2047, and n is 1.
9, the method for synchronous of channel-decoding as claimed in claim 7 is characterized in that, described k is 32896, and N is 3.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009140890A1 (en) * | 2008-05-19 | 2009-11-26 | 华为技术有限公司 | A method, a system, and an apparatus for realizing symbol synchronization |
| CN101110626B (en) * | 2006-07-17 | 2012-01-04 | 上海高清数字科技产业有限公司 | Digital signal emitting and receiving system and method thereof |
| CN107040793A (en) * | 2016-02-04 | 2017-08-11 | 晨星半导体股份有限公司 | The synchronization detecting method of data flow |
-
2006
- 2006-04-24 CN CNA2006100259914A patent/CN1852282A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101110626B (en) * | 2006-07-17 | 2012-01-04 | 上海高清数字科技产业有限公司 | Digital signal emitting and receiving system and method thereof |
| WO2009140890A1 (en) * | 2008-05-19 | 2009-11-26 | 华为技术有限公司 | A method, a system, and an apparatus for realizing symbol synchronization |
| CN107040793A (en) * | 2016-02-04 | 2017-08-11 | 晨星半导体股份有限公司 | The synchronization detecting method of data flow |
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