CN1889417A - Frame synchronizing method in digital communication - Google Patents
Frame synchronizing method in digital communication Download PDFInfo
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- CN1889417A CN1889417A CN 200510080585 CN200510080585A CN1889417A CN 1889417 A CN1889417 A CN 1889417A CN 200510080585 CN200510080585 CN 200510080585 CN 200510080585 A CN200510080585 A CN 200510080585A CN 1889417 A CN1889417 A CN 1889417A
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Abstract
This invention discloses a frame synchronization method in a digit communication, which increases synchronous adjusted buffer regions in a data frame, a receiving end stores frame head data of a data frame and data of the synchronous adjusted buffer regions, in which, the synchronization process includes: A, a transmitting end sends data frame signals containing the synchronous adjusted buffer regions to the receiving end, B, the receiving end receives the data frame signals, samples them and demodulates them to digital data, C, the receiving end judges if data dislocation has happened to the received data frame based on data frame head data stored and the first bit position of the registered data frame, if so, it moves the data bit in the digit of the synchronous buffer region to decide the position of the first bit of the data frame and makes record and carries out step D, otherwise step D is carried out directly, D, the receiving end begins obtaining data of said data frame from the first bit position of the registered frame.
Description
Technical field
The present invention relates to the transmission technology of Frame in the digital communication, the frame synchornization method in particularly a kind of digital communication.
Background technology
In digital communication system, no matter be cabled digital communication or radio digital communication, after Frame was transferred to receiving terminal from transmitting terminal, receiving terminal must correctly be judged the frame head and the postamble of Frame, otherwise, will cause the failure of Data Receiving.Guarantee receiving terminal to correct decision data frame head of received Frame and postamble, and the technology that when deviation appears in frame synchronization, can in time correct, be exactly frame synchronizing.
In the Frame communication transmission process, it is a lot of to cause data-frame sync the factor of deviation to occur, mainly contains: certain shake or instability appear in the clock of transmitting terminal and receiving terminal, cause the clock phase deviation; Channel is because the uncertain interference of some of the existence of the selectivity of frequency or channel and some interference from outside signals; All may make Frame in communication transmission process, produce phase lag or time delay, so also will cause Frame when reception is synchronous, to produce deviation.
We can say that the generation of the data-frame sync deviation in the digital communication system is a unavoidable problem that exists in the digital communication system.The existence of this problem gently then causes message transmission rate not improve, and is heavy then cause the failure of system data communication.Multinomial performance indexs such as the message transmission rate that the properly settling of this problem then can significantly promote data communication system and the stability of a system guarantee that communication system finishes communication function effectively reliably.
At present, in digital communication system, for the data-frame sync problem, method commonly used is, adopts a special synchronization frame, before sending a Frame, all will send this synchronization frame.Receiving terminal has been stored the data of this synchronization frame in advance.Like this, receiving terminal can carry out correlation computations according to the synchronization frame that the synchronization frame of prior storage receives when communicating by letter, and to judge synchronism deviation, carries out correlation computations again after being shifted according to deviation again, when displacement moves on to the correlation function value maximum of calculating, then meaned synchronously.This synchronizing process is carried out in synchronization frame.
After carrying out synchronously to synchronization frame, the result according to sampling carries out demodulation again, demodulates numerical data.Like this, when carried out the synchronism deviation correction at a synchronization frame after, also corrected the deviation that follow-up Frame exists.Yet, since clock jitter, the reason that system interference etc. all exist constantly, also may there be deviation in the Frame of back, and therefore this method for synchronous precision is not very high.And, before each Frame, issuing additional synchronization frame, system has spent the transmitting-receiving that a lot of communication resources carries out synchronization frame, has wasted system resource.
The method that also has at present is: can also adjust the transmission rate of data as much as possible, make the frame synchronization Deviation Control in the scope that system can stand; In case or synchronism deviation appears in certain Frame, just this Frame thrown away, allow system retransmit, such system synchronization method makes system in low-level work, and very unstable.Also have and adopt some special technology to carry out frame synchronization, as PHASE-LOCKED LOOP PLL TECHNIQUE etc., this technology mainly is to be conceived on circuit clock itself be adjusted, and on the cost He on the effect unsatisfactory place is being arranged all.
Summary of the invention
In view of this, main purpose of the present invention is to provide the frame synchornization method in a kind of digital communication, uses this method and carries out frame synchronization, can improve synchronous precision.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
Frame synchornization method in a kind of digital communication, this method increase in Frame adjusts buffering area synchronously, receiving terminal store frames of data frame head data and the synchronous buffer data of adjusting; Synchronizing process may further comprise the steps:
A, transmitting terminal send the data frame signal that comprises synchronous adjustment buffering area to receiving terminal;
B, receiving terminal receiving data frames signal are sampled and are demodulated into numerical data the data frame signal;
C, receiving terminal are according to the primary position of the Frame of the Frame frame head data of storage and record, judge whether the Frame that receives the data dislocation takes place, if, mobile data position in adjusting synchronously buffering area figure place scope then, determine the primary position and the record of receiving data frames, execution in step D; Otherwise, direct execution in step D;
D, receiving terminal begin to obtain the data of this Frame from the primary position of Frame of record.
Wherein, can between the frame head of Frame and data, increase and adjust buffering area synchronously.
The data of described synchronous adjustment buffering area can be integer the binary digit opposite with last bit binary number of frame head.
Described step C can comprise:
C1, with the primary position of Frame of record as current location, from current location, get the data of frame head data figure place from the Frame that receives, carry out related operation with the Frame frame head data of storage, obtain the degree of correlation, judge whether the degree of correlation reaches predetermined threshold value, if, data dislocation, execution in step D do not take place in the Frame that then receives; Otherwise execution in step C2;
C2, from current location, in adjusting synchronously buffering area figure place scope, moving pre-determined bit forward or backward;
C3, the data of frame head data figure place are got in the position after the displacement from the Frame that receives, carry out related operation with the Frame frame head data of storage, judge whether the degree of correlation reaches predetermined threshold value, if, then this position is recorded as first of Frame, execution in step D; Otherwise return step C2.
Described method of carrying out related operation can for: get the data of the Frame frame head data figure place of reception, same exclusive disjunction is carried out in corresponding position with the Frame frame head data of storage, and operation result sued for peace obtains correlation;
The method of the described acquisition degree of correlation is: the percentage of obtaining correlation that calculates and the complete synchronous right correlation that writes down in advance.
In advance Ji Lu complete synchronous right correlation can for: carry out same exclusive disjunction with the Frame frame head data of storage is corresponding with self, and operation result sued for peace obtain correlation;
Or the complete synchronous right correlation of record is in advance: Frame frame head data figure place.
Described threshold value can be set to 100% or 95 or 90% equal percentage according to the actual conditions setting of the suffered interference of system.
Step C2 is described in adjusting synchronously buffering area figure place scope, move forward or backward pre-determined bit method can for: move one forward or backward.
The order of displacement can for: from the primary position of Frame of record, step C2 of every execution moves forward one; If moved on to synchronous adjustment buffering area figure place, then from the primary position of Frame of record, step C2 of every execution moves one backward, up to synchronous adjustment buffering area figure place;
Or from the primary position of Frame of record, step C2 of every execution moves one backward; If moved on to synchronous adjustment buffering area figure place, then from the primary position of Frame of record, step C2 of every execution moves forward one, up to synchronous adjustment buffering area figure place.
This method may further include, adjusted the buffer data figure place synchronously if all move forward and backward, still do not find the data bit positions that reaches predetermined threshold, then with the data bit position of degree of correlation maximum, the primary position of the Frame that is defined as receiving.
As seen from the above technical solutions, the frame synchornization method in this digital communication of the present invention increases the framing control buffering area in Frame; After receiving terminal receives and demodulates data, judge whether this frame misplaces, if then adjusting buffering area scope internal shift, and find first position of receiving data frames, obtain the Frame data from this position, guarantee that like this Frame data of obtaining can be identical with the Frame that sends, i.e. receiving data frames and transmission data-frame sync.
Compared with prior art, the present invention does not need system to send synchronization frame earlier, and synchronization frame is carried out synchronously, but Frame itself is carried out synchronously, reduced in the two frame processes of transmission, because clock jitter, the synchronism deviation that system interference etc. cause has improved synchronization accuracy.And the present invention is after demodulating data, to the digital signal judgement that misplaces, has reduced technical difficulty.Simultaneously, the present invention need not on hardware clock circuit itself to be adjusted, and realizes that therefore simply cost is low.
Description of drawings
Fig. 1 is the wireless data transceiving system schematic diagram;
Fig. 2 is the receiving terminal frame synchronization process flow chart of a preferred embodiment of the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Frame synchornization method in this digital communication of the present invention increases the framing control buffering area in Frame; After receiving terminal receives and demodulates data, judge whether this frame misplaces, if then adjusting buffering area scope internal shift, and find first position of receiving data frames, obtain the Frame data from this position, guarantee that like this Frame data of obtaining can be identical with the Frame that sends, i.e. receiving data frames and transmission data-frame sync.
Be elaborated by the following examples.
Referring to Fig. 1, Fig. 1 is the wireless data transceiving system schematic diagram.This system has comprised sending ending equipment 100 and receiving device 110, and sending ending equipment 100 comprises: transmitting terminal single-chip microcomputer 101 and transmitting terminal radio receiving transmitting module 102; Receiving terminal 110 equipment comprise: transmitting terminal single-chip microcomputer 111 and transmitting terminal radio receiving transmitting module 112.In fact the equipment of data communication promptly is that transmitting apparatus also is a receiving equipment usually, and is clear in order to describe here, only simply divides for sending ending equipment and receiving device.
Below be elaborated with the preferred embodiment that is applied as of the present invention in wireless data transceiving system shown in Figure 1.
The frame head of Frame is in the present embodiment:
| B m | … | B 2 | ?B 1 | ?B 0 |
Wherein, B
iBe 0 or 1,0≤i≤m.During practical application, can on demand the data frame head be designed to continuous m 1 or m 0, perhaps m 10, and perhaps 01 etc.
The data of adjusting buffering area synchronously are:
| C n | … | C 2 | ?C 1 | ?C 0 |
C
iBe 0 or 1,0≤i≤n.
In the present embodiment, C
iBe continuous n 0 or 1, it is arranged between frame head and the data.C
iNumeral is opposite with last binary digit of frame head.That is, work as B
0Be 0 o'clock, C
iBe 1; Work as B
0Be 1 o'clock, C
iBe 0.Wherein, m is a default, and n is provided with according to the possible interference in the external world, if the residing environmental interference of system is bigger, then n can be provided with bigger, otherwise can be less.
In the present embodiment, receiving terminal has been stored the data of frame head and this buffering area in advance, utilizes this buffering area to carry out deviation from dynamic(al) correction.
Concrete data transmission procedure is:
At first, the data that transmitting terminal single-chip microcomputer 101 will send are packed by data frame format, add the data of synchronous adjustment buffering area between the frame head of the Frame that will send and data.
Then, transmitting terminal single-chip microcomputer 101 control transmitting terminal radio receiving transmitting modules 102, the data that packing is good are converted to data frame signal and send.Suppose that the data that will send are:
| D p | … | ?C 2 | ?C 1 | ?C 0 |
Then the partial data of transmitting terminal radio receiving transmitting module 102 transmissions is:
| B m | … | ?B 2 | ?B 1 | ?B 0 | ?C n | … | C 2 | ?C 1 | ?C 0 | ?D p | … | D 2 | ?D 1 | D 0 |
Then, receiving terminal radio receiving transmitting module 111 receives data frame signal, samples and demodulation, the data after the demodulation is sent to receiving terminal single-chip microcomputer 112 carry out Synchronous Processing.The concrete synchronizing process of receiving terminal is referring to Fig. 2, and Fig. 2 is the receiving terminal frame synchronization process flow chart of a preferred embodiment of the present invention.This flow process may further comprise the steps:
Step 201, the data frame signal of 111 pairs of receptions of receiving terminal radio receiving transmitting module is sampled and demodulation, and the data after the demodulation are sent to receiving terminal single-chip microcomputer 112.
Step 202, receiving terminal single-chip microcomputer 112 are got the m bit data from Frame the 1st bit position of record from the data that receive.The m here is exactly the figure place of Frame frame head.
For the receiving terminal single-chip microcomputer 112 that moves for the first time, Frame the 1st bit position is pre-configured and stores that later Frame the 1st bit position writes down in synchronizing process.
Step 203 is carried out related operation with the m bit data of getting and the frame head data of record, obtains the degree of correlation and also writes down current location.
In this step, related operation is that the correspondence position is carried out obtaining correlation with summation behind the exclusive disjunction.Specifically, be the m bit data of will get, same exclusive disjunction is carried out in corresponding position with the Frame frame head data of storage, can be expressed as with mathematical formulae:
Wherein, Frame is being carried out when synchronous, s is the whole scope that can change, and it is :-n≤s≤n.Work as B
iWith A
I+sWhen identical, promptly the both is 0 or is 1 o'clock, and its value gets 1; When both different time, promptly one of them is 1, and another is 0 o'clock, and its value is 0.Again each corresponding position is obtained correlation with the summation of the value behind the exclusive disjunction; Then, obtain the percentage of correlation that calculates and the complete synchronous right correlation that writes down in advance, as degree of correlation record.Obviously, this related operation method of correlation is carried out obtaining with summation behind the exclusive disjunction in corresponding position, realizes quite simply, and the correlation of acquisition accurately and reliably.
Here, in advance Ji Lu complete synchronous right correlation can for: same exclusive disjunction is carried out in Frame frame head data position corresponding with self, and summation obtains correlation to operation result; Just in advance the storage:
| B m | … | B 2 | ?B 1 | ?B 0 |
Carry out auto-correlation computation, be about to corresponding position and carry out same exclusive disjunction, and summation obtains correlation to operation result.
Ji Lu complete synchronous right correlation can also be Frame frame head data figure place in advance, this is that during auto-correlation computation, everybody is identical because what carry out computing all is binary number, everybody is 1 just with the exclusive disjunction result, the frame head data figure place just of suing for peace like this.
Step 204 judges whether the degree of correlation of calculating reaches pre-set threshold; If execution in step 205 then; Otherwise execution in step 206.
Threshold value is to set according to the actual conditions of the suffered interference of system in advance in the present embodiment, can be 100%, also can be 95% or 90% or other percentages.
Step 205 is recorded as the 1st position of Frame, execution in step 209 with current location.
If in the implementation, also be not shifted, then the Frame of explanation reception does not misplace, and keeps the 1st position of Frame of former record.
Step 206 is moved 1, forward or backward as current location.
S is that the whole scope that can change is :-n≤s≤n, therefore, the order of displacement can for: from the primary position of Frame of record, every execution one deuterzooid step moves forward one; If moved on to synchronous adjustment buffering area figure place, then from the primary position of Frame of record, every execution one deuterzooid step moves one backward, up to synchronous adjustment buffering area figure place.
Can certainly move backward earlier, promptly from the primary position of Frame of record, step C2 of every execution moves one backward; If moved on to synchronous adjustment buffering area figure place, then from the primary position of Frame of record, step C2 of every execution moves forward one, up to synchronous adjustment buffering area figure place.
Step 207, judge whether to exceed forward move backward-n≤s≤n scope, just before move past the n position and after move past the n position, if execution in step 208 then; Otherwise execution in step 210.
Step 208 is recorded as Frame the 1st bit position with the position of degree of correlation maximum.
Step 209 from the 1st position of Frame, is obtained the Frame data from demodulated data, return step 201.
Step 210 from current location, is got the m bit data from the data that receive, return step 203.
By the above embodiments as seen, frame synchornization method in this digital communication of the present invention, not needing system to send synchronization frame earlier carries out synchronously synchronization frame, but Frame itself is carried out synchronously, reduced in the two frame processes of transmission, because clock jitter, the synchronism deviation that system interference etc. cause has improved synchronization accuracy.And the present invention is after demodulating data, to the digital signal judgement that misplaces, has reduced technical difficulty.Simultaneously, the present invention need not on hardware clock circuit itself to be adjusted, and realizes that therefore simply cost is low.
Claims (11)
1, the frame synchornization method in a kind of digital communication is characterized in that, this method increases in Frame adjusts buffering area synchronously, receiving terminal store frames of data frame head data and the synchronous buffer data of adjusting; Synchronizing process may further comprise the steps:
A, transmitting terminal send the data frame signal that comprises synchronous adjustment buffering area to receiving terminal;
B, receiving terminal receiving data frames signal are sampled and are demodulated into numerical data the data frame signal;
C, receiving terminal are according to the primary position of the Frame of the Frame frame head data of storage and record, judge whether the Frame that receives the data dislocation takes place, if, mobile data position in adjusting synchronously buffering area figure place scope then, determine the primary position and the record of receiving data frames, execution in step D; Otherwise, direct execution in step D;
D, receiving terminal begin to obtain the data of this Frame from the primary position of Frame of record.
2, frame synchornization method as claimed in claim 1 is characterized in that: increase between the frame head of Frame and data and adjust buffering area synchronously.
3, method for synchronous as claimed in claim 2 is characterized in that: the data of described synchronous adjustment buffering area are: integer the binary digit opposite with last bit binary number of frame head.
4, method as claimed in claim 2 is characterized in that, described step C comprises:
C1, with the primary position of Frame of record as current location, from current location, get the data of frame head data figure place from the Frame that receives, carry out related operation with the Frame frame head data of storage, obtain the degree of correlation, judge whether the degree of correlation reaches predetermined threshold value, if, data dislocation, execution in step D do not take place in the Frame that then receives; Otherwise execution in step C2;
C2, from current location, in adjusting synchronously buffering area figure place scope, moving pre-determined bit forward or backward;
C3, the data of frame head data figure place are got in the position after the displacement from the Frame that receives, carry out related operation with the Frame frame head data of storage, judge whether the degree of correlation reaches predetermined threshold value, if, then this position is recorded as first of Frame, execution in step D; Otherwise return step C2.
5, method for synchronous as claimed in claim 4, it is characterized in that, described method of carrying out related operation is: get the data of the Frame frame head data figure place of reception, same exclusive disjunction is carried out in corresponding position with the Frame frame head data of storage, and summation obtains correlation to operation result;
The method of the described acquisition degree of correlation is: the percentage of obtaining correlation that calculates and the complete synchronous right correlation that writes down in advance.
6, method for synchronous as claimed in claim 5 is characterized in that, Ji Lu complete synchronous right correlation is in advance: same exclusive disjunction is carried out in the corresponding position with self of the Frame frame head data of storage, and summation obtains correlation to operation result;
Or the complete synchronous right correlation of record is in advance: Frame frame head data figure place.
7, method for synchronous as claimed in claim 5 is characterized in that: described threshold value is according to the actual conditions setting of the suffered interference of system.
8, method for synchronous as claimed in claim 7 is characterized in that: described threshold value is set to 100% or 95% or 90% according to the actual conditions of the suffered interference of system.
9, method for synchronous as claimed in claim 4 is characterized in that: the described method of moving pre-determined bit in adjusting buffering area figure place scope synchronously forward or backward of step C2 is: move one forward or backward.
10, method for synchronous as claimed in claim 9 is characterized in that, the order of displacement is: from the primary position of Frame of record, step C2 of every execution moves forward one; If moved on to synchronous adjustment buffering area figure place, then from the primary position of Frame of record, step C2 of every execution moves one backward, up to synchronous adjustment buffering area figure place;
Or from the primary position of Frame of record, step C2 of every execution moves one backward; If moved on to synchronous adjustment buffering area figure place, then from the primary position of Frame of record, step C2 of every execution moves forward one, up to synchronous adjustment buffering area figure place.
11, method for synchronous as claimed in claim 4, it is characterized in that: this method further comprises, adjusted the buffer data figure place synchronously if all move forward and backward, still do not find the data bit positions that reaches predetermined threshold, then with the data bit position of degree of correlation maximum, the primary position of the Frame that is defined as receiving.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100805853A CN100571120C (en) | 2005-06-30 | 2005-06-30 | Frame synchornization method in a kind of digital communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100805853A CN100571120C (en) | 2005-06-30 | 2005-06-30 | Frame synchornization method in a kind of digital communication |
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| Publication Number | Publication Date |
|---|---|
| CN1889417A true CN1889417A (en) | 2007-01-03 |
| CN100571120C CN100571120C (en) | 2009-12-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728592A (en) * | 2014-01-22 | 2014-04-16 | 四川九洲空管科技有限责任公司 | Digital array secondary radar system optical fiber communication data synchronizing method |
| CN108399111A (en) * | 2018-03-01 | 2018-08-14 | 深圳市辰卓电子有限公司 | Data acquire error correction method and device |
| CN111429826A (en) * | 2020-04-15 | 2020-07-17 | 京东方科技集团股份有限公司 | Synchronous circuit, synchronous method thereof and display device |
| CN114401078A (en) * | 2022-01-14 | 2022-04-26 | 上海工程技术大学 | Method for detecting frame head of image data frame |
-
2005
- 2005-06-30 CN CNB2005100805853A patent/CN100571120C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728592A (en) * | 2014-01-22 | 2014-04-16 | 四川九洲空管科技有限责任公司 | Digital array secondary radar system optical fiber communication data synchronizing method |
| CN108399111A (en) * | 2018-03-01 | 2018-08-14 | 深圳市辰卓电子有限公司 | Data acquire error correction method and device |
| CN108399111B (en) * | 2018-03-01 | 2022-04-26 | 深圳市辰卓电子有限公司 | Data acquisition error correction method and device |
| CN111429826A (en) * | 2020-04-15 | 2020-07-17 | 京东方科技集团股份有限公司 | Synchronous circuit, synchronous method thereof and display device |
| CN111429826B (en) * | 2020-04-15 | 2023-06-20 | 京东方科技集团股份有限公司 | Synchronization circuit, synchronization method thereof and display device |
| CN114401078A (en) * | 2022-01-14 | 2022-04-26 | 上海工程技术大学 | Method for detecting frame head of image data frame |
| CN114401078B (en) * | 2022-01-14 | 2023-10-31 | 上海工程技术大学 | Method for detecting frame head of image data frame |
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| Publication number | Publication date |
|---|---|
| CN100571120C (en) | 2009-12-16 |
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