CN103384401A - Synchronization acquisition device and method based on first-in first-out structure - Google Patents
Synchronization acquisition device and method based on first-in first-out structure Download PDFInfo
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Abstract
Provided is a synchronization acquisition device and method based on a first-in first-out structure. The device comprises a synchronous sequence acquiring device, a correlator set, an FFT converter, a peak signal selector and a judging device. The method comprises the steps that (1) the synchronous sequence acquiring device acquires a synchronous sequence of a code element length, (2) the correlator set carries out sectionalized correlation operation on the synchronous sequence and a local reference, (3) the FFT converter carries out FFT conversion on the correlation operation result of the correlator set, (4) the peak signal selector selects the amplitude peak value from the amplitude values output by the FFT converter, (5) a threshold comparator compares the amplitude peak value with a threshold value and stores the comparison result in an FIFO recorder, and (6) an FIFO detector detects the FIFO recorder under the control of the comparison result output by the threshold comparator and judges whether synchronization acquisition succeeds or not. The synchronization acquisition device and method based on the first-in first-out structure has the advantages of being small in occupancy of resources, high in acquisition speed, low in probability of omissive acquisition and wrong acquisition of the synchronization acquisition and high in probability of correct synchronization acquisition.
Description
Technical field
The invention belongs to communication technical field, further relate to synchronization acquiring device and method thereof based on the first in first out structure in radio communication.The synchronizing sequence of the receiving terminal that the present invention can be used for wireless communication system in to received signal carries out synchronization acquistion, realizes synchronizeing of receiving terminal and transmitting terminal, the correct reception of guarantee information.
Background technology
In wireless communication system, want correctly to demodulate information, must realize synchronizeing of receiving terminal and transmitting terminal.So, for wireless communication receiver, one of problem of most critical be local reference sequences with receive signal in synchronizing sequence obtain and synchronize.
At present, using, more a kind of synchronization acquistion algorithm is based on FFT-PMF segmented matched filter method, the method just can obtain frequency offseting value in the searching code phase place, thereby the two-dimensional search of phase place, frequency is become linear search, has greatly reduced capture time.But because wireless channel environment constantly changes, according to the thresholding comparison of FFT-PMF segmented matched filter method, whether successfully to adjudicate synchronization acquistion, exist leakage to obtain with erroneous arrest and obtain the high problem of probability.
The patented technology that the Innofidei Technology Co., Ltd has " a kind of method and synchronization acquistion unit that correlated results is carried out the synchronization acquistion " (applying date: May 23 in 2008, application number: 200810112499.X, Granted publication number: disclose a kind of synchronization acquiring method CN101312375B).The implementation step of the method is: the first, search in the correlated results sequence, and record any range value more than or equal to amplitude threshold value T
Amp1Sequence index value n corresponding to correlation; The second, index value n is postponed a time gate limit value T
Time, obtain a new sequence index value n
2The 3rd, from index n
2The correlated results sequence is searched in beginning backward, and first of acquisition is greater than amplitude threshold value T
Amp2The corresponding sequence index value of summit range value be thick sync bit.This synchronization acquistion unit comprises: (1) starting point indexed search module, be used for receiving correlated results sequence and search therein, and record any range value more than or equal to amplitude threshold value T
Amp1Sequence index value n corresponding to correlation; (2) new index generation module is used for index value n is postponed a time gate limit value T
Time, obtain a new sequence index value n
2(3) summit range value search module is used for from n
2The range value sequence that correlated results is searched in beginning backward, first of acquisition is greater than amplitude threshold value T
Amp2The corresponding sequence index value of summit range value be thick sync bit.The method can be applicable to time delay expansion synchronization acquistion to correlated results when larger, also is applicable to the situation of time delay expansion when little simultaneously, and is more comprehensive; Simultaneously the method has provided scope to the value of threshold value, has further provided concrete numerical value, make the method realize convenient simple.The weak point that this patented technology exists is: in patent, definition is " from index n
2The correlated results sequence is searched in beginning backward, and first of acquisition is greater than amplitude threshold value T
Amp2The corresponding sequence index value of summit range value be thick sync bit ", yet due to the complexity of wireless channel environment, first of acquisition is greater than amplitude threshold value T
Amp2The corresponding sequence index value of summit range value might not be thick synchronous point, this patent is not whether thick sync bit is correctly verified to what obtain, has increased the probability that the synchronization acquistion erroneous arrest obtains, and has reduced the performance of communication system.
The patented technology that the Innofidei Technology Co., Ltd has " a kind of signal acquisition methods of resisting the high-delay extension channel " (applying date: December 25 in 2007, application number: 200710304114.5, Granted publication number: disclose a kind of synchronization acquiring method CN100518047C).The implementation step of the method is: the first, according to system parameters, set the thresholding T of auto-correlation output amplitude
ampAnd the width threshold T of auto-correlation output amplitude waveform
widThe second, described signal is carried out auto-correlation computation, search and determine that an auto-correlation output amplitude value is greater than thresholding T
ampVery first time point; The 3rd, postpone backward very first time section from very first time point and determine that afterwards auto-correlation output amplitude value is less than thresholding T
ampThe second time point; The 4th, be less than or equal to signal period T since the second time point
2The second time period in search backward, until find a crest, if the range value of this crest is greater than thresholding T
ampAnd the amplitude wave-shape at this crest place is at thresholding T
ampOn the waveform width greater than width threshold T
wid, determine that time point corresponding to this crest is the coarse synchronization position of signal; If above-mentioned condition does not satisfy, forward first step Reparametrization T to
ampAnd T
widAfter, re-start the signal capture process; Perhaps directly return to second step, keep parameter T
ampAnd T
widConstant, then re-start the signal capture process.This invents described signal acquisition methods, signal characteristic for high-delay extension channel, by determining to comprise the search cycle of a signal, utilize the peak value Rule of judgment to find fast and accurately a qualified crest from the signal of having expanded, thereby navigate to thick sync bit, thereby, can to the channel circumstance of Chinese People's Anti-Japanese Military and Political College's time delay expansion, improve the probability of signal synchronization acquistion.The weak point that this patented technology exists is: in patent, definition " is being less than or equal to signal period T since the second time point
2The second time period in search backward, until find a crest, if the range value of this crest is greater than thresholding T
ampAnd the amplitude wave-shape at this crest place is at thresholding T
ampOn the waveform width greater than width threshold T
widDetermine that time point corresponding to this crest is the coarse synchronization position of signal "; but due to the complexity of wireless channel environment; the thick sync bit that searches may be pseudo-synchronous point; the method is not tested to the thick sync bit that searches; can cause the probability that the synchronization acquistion erroneous arrest obtains to raise, reduce the performance of communication system.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned prior art, a kind of synchronization acquiring device based on the first in first out structure and method thereof are provided, obtain the high and leakage of probability and obtain the high problem of probability, the performance of raising communication system to solve in synchronization acquistion the erroneous arrest of prior art.
For achieving the above object, synchronization acquiring device of the present invention comprises synchronizing sequence getter, correlator bank, FFT converter, peak signal selector, the decision device that is connected by signal transmssion line.The output of described synchronizing sequence getter is connected with the input of correlator bank, the correlator output that in correlator bank, solid part signal is corresponding with imaginary signals is connected with the input of FFT converter after the adder addition, the output of FFT converter is connected with the input of peak signal selector, the output of peak signal selector is connected with the input of decision device, and the output of decision device is connected with the input of synchronizing sequence correlator.Wherein,
Described synchronizing sequence getter is used for obtaining the sequence of a sync symbols length as synchronizing sequence from the wireless signal transmission that receives.
Described correlator bank comprises a plurality of correlators and a plurality of adder, and correlator is used for storing local reference sequences, realizes the related operation between the segment data of local reference sequences and corresponding synchronizing sequence getter input; Export simultaneously related operation result to adder and make accumulation process.
Described FFT converter is used for the data of adder output are done the FFT conversion.
Described peak signal selector is used for selecting peak maximum from the data of FFT converter output.
Described decision device comprises threshold compataror, FIFO register, FIFO detector; The threshold value that this threshold compataror is rule of thumb set for output and programmer to the peak signal selector is carried out size relatively; This FIFO register records corresponding data according to the comparative result of threshold compataror; This FIFO detector is judged whether synchronization acquistion is successful, and result of determination is fed back to the synchronizing sequence getter according to the record data of threshold compataror comparative result and FIFO register.
FIFO register in apparatus of the present invention comprises a plurality of FIFO components and parts and one and gate device.Between described a plurality of FIFO components and parts, series winding connects, the output of each FIFO components and parts all be connected with the input of gate device; The input of first FIFO components and parts is connected with the output of threshold compataror; Be connected with the input of FIFO detector with the output of gate device.
Described FIFO components and parts are for the data of a sync symbols length of storage; The number that the number of FIFO components and parts equals sync symbols in synchronizing sequence getter reception wireless signal transmission synchronous head subtracts 1.
Described and gate device is used for the data of input are carried out logical AND.
Utilize said apparatus, the present invention realizes that the concrete steps of synchronization acquiring method are as follows:
(1) obtain synchronizing sequence:
1a) the synchronizing sequence getter receives the wireless signal transmission that comprises at least two identical sync symbols in synchronous head;
1b) will receive the address of first data of wireless signal transmission, as the starting point of target sequence;
1c) the synchronizing sequence getter from the starting point of target sequence, is chosen the sequence of a sync symbols length as synchronizing sequence.
(2) segmentation:
2a) with the length of the synchronizing sequence number divided by correlator in correlator bank, gained business and remainder represent the sequence length after segmentation, are all correlators except last correlator in business's the corresponding correlator bank of multistage sequence with length; It is last correlator of the corresponding correlator bank of sequence of remainder with length;
2b) according to step 2a) in segmentation method local reference sequences is carried out segmentation.
(3) make related operation:
Synchronizing sequence and local reference sequences dot product with the same correlator of correspondence obtain plural coherent signal.
(4) do add operation:
Adder is cumulative respectively with real part and the imaginary part of plural coherent signal, obtains the cumulative and signal of plural number.
(5) do the FFT conversion:
The FFT converter is done the FFT conversion to cumulative and signal, obtains and the FFT conversion range value one to one of counting.
(6) select peak signal:
The maximum of peak signal selector selecting range peak value from range value obtains an amplitude peak value.
(7) compare the size of amplitude peak value and threshold value:
Threshold compataror carries out size relatively to amplitude peak value and threshold value, if the amplitude peak value more than or equal to threshold value, threshold compataror output 1 is result as a comparison; If the amplitude peak value is less than threshold value, threshold compataror output 0 is result as a comparison, the comparative result of FIFO register storage threshold compataror; According to first in first out, output is stored in the data in the FIFO register.
(8) judge whether synchronization acquistion is successful:
When the comparative result of threshold compataror output is 1, the FIFO detector detects the output of FIFO register, and judge whether synchronization acquistion is successful: if the output data of FIFO register are 1, the FIFO detector is exported thick sync bit, synchronization acquistion is judged to be successfully, execution in step (9); If the output data of FIFO register are 0, the synchronizing sequence getter is received the address of next data of wireless signal transmission as the starting point of target sequence, change step 1c over to) re-start synchronization acquistion.
(9) communication system finishes the synchronization acquistion state, enters synchronous tracking mode.
The present invention compared with prior art has the following advantages:
First, adopt the FIFO register of first in first out structure due to the present invention, record the comparative result of threshold compataror output, overcome prior art owing to capturing pseudo-synchronous point, and the problem that real synchronous point is missed, reduce the probability that the synchronization acquistion leakage obtains, improved the performance of communication system.
The second, because the present invention adopts the FIFO detector, when the comparative result of threshold compataror output satisfied condition, the FIFO detector judged by the output that detects the FIFO register whether synchronization acquistion is successful; In judgement synchronization acquistion success, when obtaining thick sync bit, thick sync bit is verified like this, reduced the probability that the synchronization acquistion erroneous arrest obtains, improved the performance of communication system.
The 3rd, adopt FIFO register and the FIFO detector of first in first out structure due to the present invention, under same acquisition accuracy requires, device of the present invention can adopt the shorter sync symbols of a plurality of Baud Lengths to realize, the resource that needs when reducing thus communication system and doing related operation and FFT conversion, accelerate the processing speed of synchronization acquistion process, make synchronization acquiring device of the present invention have a resource occupation few, the fireballing advantage of synchronization acquistion.
The 4th, because synchronization acquiring method of the present invention is judging synchronization acquistion whether during success, require to only have to satisfy condition simultaneously when the output of threshold compataror and the output of FIFO register, can be judged to be the synchronization acquistion success; Such decision method has overcome in synchronization acquistion the erroneous arrest of prior art and has obtained the high and leakage of probability and obtain the high problem of probability, makes communication system have advantages of that the accurate synchronization acquisition probability is high.
Description of drawings
Fig. 1 is the block diagram of apparatus of the present invention;
Fig. 2 is the block diagram of FIFO register in apparatus of the present invention;
Fig. 3 is the flow chart of the inventive method.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
With reference to accompanying drawing 1, the inventive system comprises the synchronizing sequence getter, correlator bank, FFT converter, peak signal selector, the decision device that are connected by signal transmssion line.the input of synchronizing sequence getter receives wireless signal transmission, correlator bank comprises P correlator and P adder, the output of synchronizing sequence getter respectively with correlator 1, correlator 2, ... the input of correlator P is connected, correlator 1, correlator 2, ... the input of the adder that the output of correlator P is corresponding with correlator is connected, the output of adder is connected with the input of FFT converter, the output of FFT converter is connected with the input of peak signal selector, the output of peak signal selector is connected with the input of decision device, the output of decision device is connected with the input of synchronizing sequence correlator, the output of decision device is the output of synchronization acquiring device of the present invention.
The function of synchronizing sequence getter is to obtain the sequence of a sync symbols length as synchronizing sequence from the wireless signal transmission that receives.Correlator bank comprises P correlator and P adder, correlator is used for storing local reference sequences, realization is exported simultaneously related operation result to adder and is made accumulation process the related operation between the segment data of local reference sequences and corresponding synchronizing sequence getter input.The function of FFT converter is that the data of adder output are done the FFT conversion.The function of peak signal selector is to select peak maximum from the data of FFT converter output.Decision device comprises threshold compataror, FIFO register, FIFO detector.The function of threshold compataror is, the threshold value that output and the programmer of peak signal selector rule of thumb sets is carried out size relatively; The function of FIFO register is, records corresponding data according to the comparative result of threshold compataror; The function of FIFO detector is according to the comparative result of threshold compataror and the record data of FIFO register, to judge whether synchronization acquistion is successful, and result of determination is fed back to the synchronizing sequence getter.
With reference to accompanying drawing 2, the FIFO register in apparatus of the present invention comprises h FIFO components and parts and one and gate device.The output of threshold compataror is connected with the input of FIFO components and parts 1, the output of FIFO components and parts 1 is respectively with the input of FIFO components and parts 2, be connected with the input of gate device, the input of the output of FIFO components and parts 2 and next FIFO components and parts and being connected with the input of gate device, the output of FIFO components and parts h be connected with the input of gate device; Be connected with the input of FIFO detector with the output of gate device.
The function of FIFO components and parts is to store the data of a sync symbols length; The number that the number of FIFO components and parts equals sync symbols in synchronizing sequence getter reception wireless signal transmission synchronous head subtracts 1.That the data of input are carried out logic and operation with the function of gate device.
adopt the FIFO register of first in first out structure due to the present invention, no matter the big or small comparative result between the output of peak signal selector and the threshold value of threshold compataror how, all comparative result is recorded in the FIFO register, and after synchronization acquistion success or not judgement in, again detect comparative result, overcome and existed in the prior art, the index value that first qualified range value of finding is corresponding is as thick sync bit, thereby and stop the problem that the synchronization acquistion process is missed real thick sync bit, reduced the probability that communication system synchronization acquistion leakage obtains.
Because the present invention adopts the FIFO detector, when the comparative result of threshold compataror output satisfied condition, the FIFO detector judged that by the output that detects the FIFO register whether synchronization acquistion is successful, obtains thick sync bit; Because the data length of FIFO components and parts storage equals the length of a sync symbols, when the data of the output of FIFO register are 1, the output data that each FIFO components and parts just are described are 1, just illustrated that also the range value more than or equal to threshold value just appears in one, interval sync symbols length, if this moment, the comparative result of threshold compataror output was also 1, the thick sync bit of FIFO detector output is exactly the accurate synchronization position through multiple authentication, has reduced the probability that communication system synchronization acquistion erroneous arrest obtains.
Adopt FIFO register and the FIFO detector of first in first out structure due to the present invention, under same acquisition accuracy requires, device of the present invention can adopt the shorter sync symbols of a plurality of Baud Lengths to realize, sync symbols length shortens, the length of local reference sequences shortens, when doing related operation and FFT variation, reduced the usage quantity of multiplier and adder, so just reduced the resource that takies, accelerated the processing speed of synchronization acquistion process, make synchronization acquiring device of the present invention have a resource occupation few, the fireballing advantage of synchronization acquistion.
Below in conjunction with accompanying drawing 3, method of the present invention is done further described.
Comprise 2 identical sync symbols in the embodiment of the present invention in synchronous head, and sync symbols length is the wireless signal transmission of M.The synchronizing sequence getter receives wireless signal transmission, and with the address of first data of wireless signal transmission, the starting point as target sequence is labeled as first_point.
Step 1 is obtained synchronizing sequence.
The synchronizing sequence getter is chosen the long sequence of a M as synchronizing sequence in wireless signal transmission from first_point.
Step 2, segmentation.
The synchronizing sequence getter carries out segmentation according to the following formula with synchronizing sequence:
Y＝M-XP
Wherein, P represents the number of correlator in correlator bank, the segmentation Baud Length of P-1 correlator before X represents in corresponding correlator bank,
Expression rounds downwards, and Y represents the segmentation Baud Length of P correlator in corresponding correlator bank, and M represents the length of the synchronizing sequence that the synchronizing sequence getter obtains.By this segmentation method, synchronizing sequence has been divided into the P section.
Local reference sequences adopts is a sync symbols in information source transmission information, according to above-mentioned segmentation method, local reference sequences is divided into the P section, and the local reference sequences after segmentation is stored in corresponding correlator.
Step 3 is made related operation.
P in a correlator bank correlator with synchronizing sequence and the local reference sequences dot product of corresponding this correlator, obtains plural coherent signal respectively, and plural coherent signal is sent into adder deals with.
Step 4 is done add operation.
Adder adds up real part and the imaginary part of plural coherent signal respectively, obtains the cumulative and signal of plural number, and P different adder exported altogether P different plural number and added up and signal.
Step 5 is done the FFT conversion.
P is added up the FFT converter and signal is done N point FFT conversion, obtains N range value; Wherein, N 〉=P, i.e. FFT conversion is counted must be more than or equal to the number of correlator in correlator bank, and the specific several of N select according to the needed precision of system's correcting frequency offset.
Step 6 is selected peak signal.
The peak signal selector is selected an amplitude peak value from N range value, be designated as peak, the position mark in N point corresponding to amplitude peak value is peak_local, after peak_local is used for the synchronization acquistion success, when signal is processed, compensate of frequency deviation uses, in the present invention not effect.
Step 7, the relatively size of amplitude peak value and threshold value.
Threshold compataror carries out size relatively with amplitude peak value peak and threshold value: if peak more than or equal to threshold value, threshold compataror output 1 result as a comparison; If peak is less than threshold value, threshold compataror output 0 result as a comparison, the comparative result of FIFO register storage threshold compataror.
The threshold value average power that to be the user receive wireless signal transmission with the synchronizing sequence getter after adjusting according to concrete wireless channel environment, is pre-stored in a value of threshold compataror as initial value.The user need to consider the sync symbols number that comprises in the signal to noise ratio of wireless channel environment and wireless signal transmission synchronous head when adjusting threshold value; When the wireless channel environment signal to noise ratio is larger, should suitably improve threshold value, when the wireless channel environment signal to noise ratio hour, should suitably reduce threshold value; When the sync symbols number that comprises in the wireless signal transmission synchronous head is less, should suitably improve threshold value, when the sync symbols number that comprises in the wireless signal transmission synchronous head is more, should suitably reduce threshold value.
In embodiments of the invention, because the wireless signal transmission synchronous head adopts two sync symbols, so the FIFO components and parts that the FIFO register is M by a storage data length consist of.
Step 8 judges whether synchronization acquistion is successful.
When threshold compataror output 1 as a comparison as a result the time, the FIFO detector detects the output of FIFO register, if FIFO register output data are 1, judge the synchronization acquistion success, this moment, the position of first_point mark was thick sync bit, the thick sync bit of FIFO detector output, execution in step 9; If the output data of FIFO register are 0, the first_point value is added 1, point to the next data that the synchronizing sequence getter receives wireless signal transmission, change step 1 over to and re-start synchronization acquistion.
Step 9, communication system finishes the synchronization acquistion state, enters synchronous tracking mode.
Because synchronization acquiring method of the present invention is judging synchronization acquistion whether during success, require to only have to satisfy condition simultaneously when the output of threshold compataror and the output of FIFO register, can be judged to be the synchronization acquistion success; Such decision method, not only capture thick sync bit, and according to the characteristics of FIFO register, to thick sync bit is that correctness is verified, overcome in synchronization acquistion the erroneous arrest of prior art and obtained the high and leakage of probability and obtain the high problem of probability, made communication system have advantages of that the accurate synchronization acquisition probability is high.
Claims (6)
1. the synchronization acquiring device based on the first in first out structure, comprise the synchronizing sequence getter, correlator bank, FFT converter, peak signal selector, the decision device that are connected by signal transmssion line; The output of described synchronizing sequence getter is connected with the input of correlator bank, the output of each correlator is connected with the input of FFT converter after adder is cumulative, the output of FFT converter is connected with the input of peak signal selector, the output of peak signal selector is connected with the input of decision device, and the output of decision device is connected with the input of synchronizing sequence correlator; Wherein,
Described synchronizing sequence getter is used for obtaining the sequence of a sync symbols length as synchronizing sequence from the wireless signal transmission that receives;
Described correlator bank comprises a plurality of correlators and a plurality of adder, and correlator is used for storing local reference sequences, realizes the related operation between the segment data of local reference sequences and corresponding synchronizing sequence getter input; Export simultaneously related operation result to adder and make accumulation process;
Described FFT converter is used for the data of adder output are done the FFT conversion;
Described peak signal selector is used for selecting peak maximum from the data of FFT converter output;
Described decision device comprises threshold compataror, FIFO register, FIFO detector; This threshold compataror is used for the threshold value of the output of peak signal selector and setting big or small, these FIFO recorder trace comparative result data, this FIFO detector is according to the record data of threshold compataror comparative result and FIFO register, judge whether synchronization acquistion is successful, and result of determination is fed back to the synchronizing sequence getter.
2. the synchronization acquiring device based on the first in first out structure according to claim 1, is characterized in that, described FIFO register comprises a plurality of FIFO components and parts and one and gate device; Between described a plurality of FIFO components and parts, series winding connects, the output of each FIFO components and parts all be connected with the input of gate device; The input of first FIFO components and parts is connected with the output of threshold compataror; Be connected with the input of FIFO detector with the output of gate device; Wherein,
Described FIFO components and parts are for the data of a sync symbols length of storage; The number that the number of FIFO components and parts equals sync symbols in synchronizing sequence getter reception wireless signal transmission synchronous head subtracts 1;
Described and gate device is used for the data of input are carried out logic and operation.
3. the synchronization acquiring method based on the first in first out structure, comprise the steps:
(1) obtain synchronizing sequence:
1a) the synchronizing sequence getter receives the wireless signal transmission that comprises at least two identical sync symbols in synchronous head;
1b) will receive the address of first data of wireless signal transmission, as the starting point of target sequence;
1c) the synchronizing sequence getter from the starting point of target sequence, is chosen the sequence of a sync symbols length as synchronizing sequence;
(2) segmentation:
2a) with the length of the synchronizing sequence number divided by correlator in correlator bank, gained business and remainder represent the sequence length after segmentation, are all correlators except last correlator in business's the corresponding correlator bank of multistage sequence with length; It is last correlator of the corresponding correlator bank of sequence of remainder with length;
2b) according to step 2a) described segmentation method carries out segmentation to local reference sequences;
(3) make related operation:
Synchronizing sequence and local reference sequences dot product with the same correlator of correspondence obtain plural coherent signal;
(4) do add operation:
Adder is cumulative respectively with real part and the imaginary part of plural coherent signal, obtains the cumulative and signal of plural number;
(5) do the FFT conversion:
The FFT converter is done the FFT conversion to cumulative and signal, obtains and the FFT conversion range value one to one of counting;
(6) select peak signal:
The maximum of peak signal selector selecting range peak value from range value obtains an amplitude peak value;
(7) compare the size of amplitude peak value and threshold value:
Threshold compataror carries out size relatively to amplitude peak value and threshold value, if the amplitude peak value more than or equal to threshold value, threshold compataror output 1 is result as a comparison; If the amplitude peak value is less than threshold value, threshold compataror output 0 is result as a comparison, the comparative result of FIFO register storage threshold compataror; According to first in first out, output is stored in the data in the FIFO register;
(8) judge whether synchronization acquistion is successful:
When the comparative result of threshold compataror output is 1, the FIFO detector detects the output of FIFO register, and judge whether synchronization acquistion is successful: if the output data of FIFO register are 1, the FIFO detector is exported thick sync bit, synchronization acquistion is judged to be successfully, execution in step (9); If the output data of FIFO register are 0, the synchronizing sequence getter is received the address of next data of wireless signal transmission as the starting point of target sequence, change step 1c over to) re-start synchronization acquistion;
(9) communication system finishes the synchronization acquistion state, enters synchronous tracking mode.
4. the synchronization acquiring method based on the first in first out structure according to claim 3, is characterized in that step 2b) described in local reference sequences adopts is a sync symbols in information source transmission information.
5. the synchronization acquiring method based on the first in first out structure according to claim 3, it is characterized in that, threshold value described in step (7) refers to, the user receives the average power of wireless signal transmission as initial value with the synchronizing sequence getter, after adjusting according to concrete wireless channel environment, be pre-stored in a value of threshold compataror.
6. the synchronization acquiring method based on the first in first out structure according to claim 3, is characterized in that, the thick sync bit described in step (8) refers to, the position that the target sequence starting point is corresponding.
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| CN107063311A (en) * | 2017-04-21 | 2017-08-18 | 江西飞尚科技有限公司 | A kind of dynamic measurement system method of single coil vibrating sensor |
| CN107070496A (en) * | 2017-04-13 | 2017-08-18 | 西安电子科技大学 | Real-time synchronization acquisition equipment and method based on partial matched filter algorithm |
| CN115134064A (en) * | 2021-03-27 | 2022-09-30 | 华为技术有限公司 | Data synchronization method and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103634095A (en) * | 2013-12-20 | 2014-03-12 | 北京华力创通科技股份有限公司 | Timed capturing device and method for satellite mobile communication receiving terminal |
| CN103634095B (en) * | 2013-12-20 | 2017-01-18 | 北京华力创通科技股份有限公司 | Timed capturing device and method for satellite mobile communication receiving terminal |
| CN107070496A (en) * | 2017-04-13 | 2017-08-18 | 西安电子科技大学 | Real-time synchronization acquisition equipment and method based on partial matched filter algorithm |
| CN107070496B (en) * | 2017-04-13 | 2019-03-26 | 西安电子科技大学 | Real-time synchronization acquisition equipment and method based on partial matched filter algorithm |
| CN107063311A (en) * | 2017-04-21 | 2017-08-18 | 江西飞尚科技有限公司 | A kind of dynamic measurement system method of single coil vibrating sensor |
| CN115134064A (en) * | 2021-03-27 | 2022-09-30 | 华为技术有限公司 | Data synchronization method and electronic equipment |
| WO2022206496A1 (en) * | 2021-03-27 | 2022-10-06 | 华为技术有限公司 | Data synchronization method and electronic device |
| CN115134064B (en) * | 2021-03-27 | 2024-01-16 | 华为技术有限公司 | Data synchronization method and electronic equipment |
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