CN100373917C - Synchronous method for channel decodable bit interleave or rescrambling code in digital television ground transmission - Google Patents
Synchronous method for channel decodable bit interleave or rescrambling code in digital television ground transmission Download PDFInfo
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- CN100373917C CN100373917C CNB2006100259929A CN200610025992A CN100373917C CN 100373917 C CN100373917 C CN 100373917C CN B2006100259929 A CNB2006100259929 A CN B2006100259929A CN 200610025992 A CN200610025992 A CN 200610025992A CN 100373917 C CN100373917 C CN 100373917C
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Abstract
The present invention relates to a synchronizing method for channel decodable bit interlaced codes or descrambling codes in the ground transmission of digital televisions, which belongs to the technical field of digital signal transmission. The method of the present invention has the steps that an m1 bit PN sequence is added with two n-bit electric level deterministic signals so as to realize preset information; two electric level sequences protected by an m2-bit spread spectrum are used to realize system information, and each transmission mode is corresponding to one of system information vectors realized by the two m2-bit electric level sequences; at a receiving terminal of a transmission system, a first symbol clock position behind the preset information is used as an initial position for detecting the system information, a first symbol clock position behind the system information is used as an initial position for channel decodable bit interlaced codes or descrambling codes, and channel decodable bit code interlacing or code descrambling is carried out for the subsequent data information. The method of the present invention completes the channel decodable bit code interlacing or code descrambling according to the position of the system information, and an entire synchronizing process can still be completed successfully before equilibrium under the condition of large disturbance because spread spectrum protection is carried out for the system information.
Description
Technical field
The present invention relates to a kind of method of digital signal transmission technique field, relate in particular to the method for synchronous that channel in a kind of digital TV ground transmission is separated Bit Interleave or descrambling code.
Background technology
Typical wireless transmitting system comprises transmitter and receiver.Typical digital radio system for transmitting block diagram is seen accompanying drawing 1, and transmission course mainly may further comprise the steps: 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.
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.The effect of preset information can be a usefulness of making system synchronization, clock recovery, channel estimating and equalizer training.System information can be used for characterizing the transmission mode of this frame of data information.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, be high code check transmission mode (32-0QAM and 16-0QAM), middle code check transmission mode (4-0QAM), low code check transmission mode (4-0QAM-E), each transmission mode can be that minimum mixed cell carries out mixed transport with Frame.Under four kinds of transmission modes during the system transmissions signal, all to carry out channel at receiving terminal in to the Signal Processing process and separate Bit Interleave, how this determines data are carried out the original position that deinterleaving is handled if just relating to, how to realize that just channel separates the stationary problem of Bit Interleave.Same, also to carry out the channel descrambling code at receiving terminal in to the Signal Processing process, this just relates to original position how to determine data are carried out descrambling code, just how to realize the stationary problem of descrambling code.
Find through literature search prior art, in the disclosed patent No. of 2002.05.22 be: in the Chinese patent of CN1350380 " expanded symbol synchronizing method, receiving system and travelling carriage ", proposed a kind ofly, detected the receiving synchronous method of the scramble code mask of handoff target sub-district by coherent detection.Obviously, this method mainly is suitable for the peculiar structure of mobile communication system.Yet,, just need formulate distinctive method for synchronous according to system at the ADTB-T system.
Summary of the invention
The objective of the invention is at deficiency of the prior art, provide channel in a kind of digital TV ground transmission to separate the method for synchronous of Bit Interleave or descrambling code.The present invention determines that according to the position of system information channel separates the original position of Bit Interleave or the original position of descrambling code, system can according to this original position realize channel separate Bit Interleave synchronously or descrambling code synchronously, finish and separate Bit Interleave and descrambling code.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 forming the circulation of simple single order with this, described preset information is by m
1The two level deterministic signals that the PN sequence of position increases the n position realize, wherein m
1With n's be necessary for 2 power power; Described system information is by m
2Two sequence of levels of position spread spectrum protection realize that every kind of transmission mode correspondence is by m
2In the system information vector that position two sequence of levels realize one, m
2It is 2 power power; Can provide applicable special case in the real system, m
1Be 2047, n is 1, m
2Be 128, k is 32896, and N is 3.
At the transmission system receiving terminal, to carrying out channel without the data message stream of separating Bit Interleave when separating Bit Interleave and handling, by detecting the position of determining preset information, with first symbol clock position after this preset information, original position as detection system information, then by detect determining the position of the system information corresponding with every kind of transmission mode, with first symbol clock position after this system information, as the original position that channel is separated Bit Interleave, data message is afterwards separated Bit Interleave as channel.
When the data message stream without descrambling code is carried out the descrambling code processing, by detecting the position of determining preset information, with first symbol clock position after this preset information, original position as detection system information, then by detect determining the position of the system information corresponding with every kind of transmission mode, with first symbol clock position after this system information,, data message is afterwards made descrambling code as the original position of channel descrambling code.
The present invention can use asynchronous correlator to determine the position of preset information, and method is:
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.According to frame structure, transmission is system information after the preset information, so the end position of preset information is the starting position of system information.Above-mentioned N continuous is determined the position of preset information when time asynchronous correlator output valve is all for autocorrelation value when interval k timeticks, this N can get positive integers such as 1,2,3,4.
The present invention can use sync correlator to determine the position of system information, and method is:
At the transmission system receiving terminal several sync correlator are set, each sync correlator detects a kind of system information transmissions pattern of agreement, the data flow that receives is imported each sync correlator, each sync correlator first timeticks behind above-mentioned detected preset information end position is started working, when one of them sync correlator output valve is autocorrelation value, what determine transmission at that time is the system information that this sync correlator agreement detects, the end position that transmit in this frame for the system information of agreement this position.First symbol clock beat behind this position begins to separate Bit Interleave or descrambling code interweaves.
Preset information of the present invention has used the PN sequence, and the characteristics of PN sequence are that the auto-correlation characteristics are good.Like this, when in receiver, using correlator to detect the preset information position, can decide by the correlation peak of PN.The gain of correlator is very high, so just can be under the bigger situation of interference ratio, and still judge accurately and separate the original position that Bit Interleave or descrambling code interweave.The method of this PN related synchronization has acquisition speed faster than simple sign synchronization, 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 32-0QAM, 16-0QAM, the frame structure of middle code check 4-0QAM and low code check 4-0QAM-E
Fig. 4 is asynchronous correlator configuration figure
Fig. 5 is the sync correlator structure chart
Fig. 6 is the asynchronous correlator annexation block diagram of transmission system receiving terminal
Fig. 7 separates the flow chart of Bit Interleave for synchronizing channel
Embodiment
With embodiment the present invention is described further with reference to the accompanying drawings below:
The method for synchronous that channel of the present invention is separated Bit Interleave and descrambling code 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.It number is scheme in 200410039115.8 the patent of invention that the concrete technical scheme of its frame structure adopts Chinese patent application, Fig. 3 has shown the high code check 32-0QAM that the ADTB-T system adopts, 16-0QAM, in the object lesson of frame structure of code check 4-0QAM and low code check 4-0QAM-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.
Even number vector in 256 system information vectors of described system information all is the negate of its last odd number vector;
In corresponding 256 the system information vectors of every kind of transmission mode one, its complement vector is as retained-mode; The definition that below is each pattern is given an example:
The 1st vector keeps
The 2nd vector keeps
The 3rd vector 32-0QAM
The 3rd vector negate of the 4th vector
The 5th vector 16-0QAM
The 5th vector negate of the 6th vector
The 7th vector 4-0QAM
The 7th vector negate of the 8th vector
The 9th vector 4-0QAM-E
The 9th vector negate of the 10th vector
Other vector keeps
Use the present invention the transmission system that adopts above-mentioned frame structure is carried out channel-decoding and the synchronous method of symbol de-maps, the specific implementation process is:
Before the transmission system receiving terminal is separated Bit Interleave, 1 asynchronous correlator and 4 sync correlator are set, its annexation is as shown in Figure 6.Wherein asynchronous correlator is used for detecting the position of preset information, sync correlator 1 is used for the 4th vector in the detection system information, sync correlator 2 is used for the 6th vector in the detection system information, sync correlator 3 is used for the 8th vector in the detection system information, sync correlator 4 is used for the 10th vector in the detection system information, Fig. 4 is the structure chart of asynchronous correlator, and Fig. 5 is the structure chart of sync correlator.
In the technical scheme of ADTB-T system, high, under two kinds of code check transmission modes, receiving terminal is that the data message stream to input carries out after symbol de-maps handles, and carry out channel and separate Bit Interleave and handle; Under the low code check transmission mode, receiving terminal is after the data message stream of importing is carried out symbol de-maps and NR decoding processing, to carry out channel and separate the Bit Interleave processing, and the realization channel is separated the synchronous process of Bit Interleave and is:
At receiving terminal, with receive without the data message stream of separating Bit Interleave at first serial import asynchronous correlator, again data message stream is imported each sync 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.First timeticks after preset information, sync correlator 1,2,3,4 is started working, when sync correlator 1 output valve is autocorrelation value, show that sync correlator 1 detects the 4th vector in the system information, determine that this position is the end of transmission position of the 4th vector, with first symbol clock position behind this position is starting point, and data message is afterwards interweaved as channel bit; When sync correlator 2 output valves are autocorrelation value, show that sync correlator 2 detects the 6th vector in the system information, determining that this position is the end of transmission position of the 6th vector, is starting point with first symbol clock position behind this position, and data message is afterwards interweaved as channel bit; When sync correlator 3 output valves are autocorrelation value, show that sync correlator 3 detects the 8th vector in the system information, determine that this position is the end of transmission position of the 8th vector, with first symbol clock position behind this position is starting point, and data message is afterwards separated Bit Interleave as channel; When sync correlator 4 output valves are autocorrelation value, show that sync correlator 4 detects the 10th vector in the system information, determine that this position is the end of transmission position of the 10th vector, with first symbol clock position behind this position is starting point, and data message is afterwards separated Bit Interleave as channel.Fig. 7 separates the flow chart of Bit Interleave for synchronizing channel.
Same method can be applied in the synchronous descrambling code.Before transmission system receiving terminal descrambling code, 1 asynchronous correlator and 4 sync correlator are set, its annexation is as shown in Figure 6.Wherein asynchronous correlator is used for detecting the position of preset information, sync correlator 1 is used for the 4th vector in the detection system information, sync correlator 2 is used for the 6th vector in the detection system information, sync correlator 3 is used for the 8th vector in the detection system information, sync correlator 4 is used for the 10th vector in the detection system information, Fig. 4 is the structure chart of asynchronous correlator, and Fig. 5 is the structure chart of sync correlator.
In the technical scheme of ADTB-T system, under the high code check transmission mode, receiving terminal is after the data message stream of importing is carried out CRC check, to carry out descrambling code and handle; In, under the low code check transmission mode, receiving terminal is after the data message stream to input carries out the RS decoding processing, to carry out descrambling code and handle.Realize that the synchronous process of descrambling code is:
At receiving terminal, with receive without the data message stream of descrambling code at first serial import asynchronous correlator, again data message stream is imported each sync 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.First timeticks after preset information, sync correlator 1,2,3,4 is started working, when sync correlator 1 output valve is autocorrelation value, show that sync correlator 1 detects the 4th vector in the system information, determine that this position is the end of transmission position of the 4th vector, with first symbol clock position behind this position is starting point, and data message is afterwards made descrambling code; When sync correlator 2 output valves are autocorrelation value, show that sync correlator 2 detects the 6th vector in the system information, determining that this position is the end of transmission position of the 6th vector, is starting point with first symbol clock position behind this position, and data message is afterwards made descrambling code; When sync correlator 3 output valves are autocorrelation value, show that sync correlator 3 detects the 8th vector in the system information, determining that this position is the end of transmission position of the 8th vector, is starting point with first symbol clock position behind this position, and data message is afterwards made descrambling code; When sync correlator 4 output valves are autocorrelation value, show that sync correlator 4 detects the 10th vector in the system information, determining that this position is the end of transmission position of the 10th vector, is starting point with first symbol clock position behind this position, and data message is afterwards made the channel descrambling code.
Claims (3)
1. channel is separated the method for synchronous of Bit Interleave or descrambling code in the digital TV ground transmission, 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 described method comprises step:
By m
1The two level deterministic signals that the PN sequence of position increases the n position realize described preset information, wherein m
1With n's be 2 power power;
By m
2Two sequence of levels of position spread spectrum protection realize described system information, and every kind of transmission mode correspondence is by m
2In the system information vector that position two sequence of levels realize one, wherein m
2It is 2 power power;
At the transmission system receiving terminal, data message stream is carried out channel when separating Bit Interleave or channel descrambling code and handling, by detecting the position of determining preset information, with first symbol clock position after this preset information, original position as detection system information, then by detect determining the position of the system information corresponding with every kind of transmission mode, with first symbol clock position after this system information, as the original position that channel is separated bit deinterleaving or channel descrambling code, data message is afterwards separated Bit Interleave or channel descrambling code as channel;
The position of described preset information, use asynchronous correlator to determine that step comprises:
1.. the transmission system receiving terminal was provided with the asynchronous correlator that is used to detect the preset information position before separating Bit Interleave or channel descrambling code;
2.. what will receive imports this asynchronous correlator without the data flow serial of separating Bit Interleave or channel descrambling code, 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;
The position of described system information, use sync correlator to determine that its step comprises:
1.. the transmission system receiving terminal is provided with several sync correlator, and each sync correlator detects the system information vector corresponding with a kind of transmission mode;
2.. sync correlator first symbol clock beat behind the preset information position is started working, when one of them sync correlator output valve is autocorrelation value, what determine transmission at that time is the system information that this sync correlator agreement detects, the end position that transmit in this frame for the system information of agreement this position.
2. channel is separated the method for synchronous of Bit Interleave or descrambling code in the digital TV ground transmission as claimed in claim 1, it is characterized in that described m
1Be 2047, n is 1, m
2Be 128.
3. channel is separated the method for synchronous of Bit Interleave or descrambling code in the digital TV ground transmission as claimed in claim 1, it is characterized in that, described k is 32896, and N is 3.
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| CN106953712B (en) * | 2006-07-17 | 2020-07-24 | 上海高清数字科技产业有限公司 | Digital signal transmitting and receiving system and method |
| CN101374340B (en) * | 2007-08-23 | 2012-02-29 | 中兴通讯股份有限公司 | Method and apparatus for interleaving and de-interleaving district interference synergic control channel |
| US8104055B2 (en) * | 2007-11-14 | 2012-01-24 | Mavs Lab. Inc. | Method of identifying target synchronization point pair through scan-line image matching scheme |
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| US6310896B1 (en) * | 1998-05-13 | 2001-10-30 | Globespan, Inc. | System and method for data sequence correlation in the time domain |
| CN1564505A (en) * | 2004-04-02 | 2005-01-12 | 清华大学 | Frame synchronous dynamic captive device in orthogonal FDM system |
| CN1638314A (en) * | 2004-02-06 | 2005-07-13 | 上海交通大学 | Signal transmission method of digital TV ground transmission system |
| CN1642276A (en) * | 2004-03-29 | 2005-07-20 | 上海交通大学 | Mixed transmission method in digital television ground troadcasting transmission system |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0760581A2 (en) * | 1995-08-30 | 1997-03-05 | Samsung Electronics Co., Ltd. | Data segment sync detection circuit and method thereof |
| CN1147171A (en) * | 1995-08-30 | 1997-04-09 | 三星电子株式会社 | Data segement sync detection circuit and method thereof |
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| CN1638314A (en) * | 2004-02-06 | 2005-07-13 | 上海交通大学 | Signal transmission method of digital TV ground transmission system |
| CN1642276A (en) * | 2004-03-29 | 2005-07-20 | 上海交通大学 | Mixed transmission method in digital television ground troadcasting transmission system |
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