CN107864032A - A kind of spread-spectrum signal bit synchronization and frame synchronization method for amalgamation processing - Google Patents
A kind of spread-spectrum signal bit synchronization and frame synchronization method for amalgamation processing Download PDFInfo
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- CN107864032A CN107864032A CN201711166208.0A CN201711166208A CN107864032A CN 107864032 A CN107864032 A CN 107864032A CN 201711166208 A CN201711166208 A CN 201711166208A CN 107864032 A CN107864032 A CN 107864032A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
- H04L7/042—Detectors therefor, e.g. correlators, state machines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
- H04J3/0608—Detectors therefor, e.g. correlators, state machines
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Abstract
A kind of spread-spectrum signal bit synchronization and frame synchronization method for amalgamation processing, for in the prior art, by the problems such as frame loss rate easily occurred in statistics with histogram and maximum likelihood method progress bit synchronization and frame synchronization means is high, detection error rate is high, data and the method for exporting short code cycle initial position simultaneously are calculated by the correlation energy value matched filtering of short code cycle is calculated, solve the problems, such as to spread-spectrum signal while signal bit synchronization and frame synchronization can not be realized, stablize, reliability is high.
Description
Technical field
The present invention relates to a kind of spread-spectrum signal bit synchronization and frame synchronization method for amalgamation processing, belong to communication technical field.
Background technology
Message communication receiver project demand receives multichannel message communication signal simultaneously, and the receiver may operate in load
Make an uproar than under the conditions of C/N0 34dB Hz, signal capture meets project demands with synchronous probability.Message communication signal format is short prominent
Hair pattern, signal duration length are variable.The signal is made up of synchronous head, duties section with data segment.Synchronous head is short by the cycle
Code composition, is modulated without data, and for receiver acquisition signal, duties section is by the information structure such as frame head and user's mark, number
It is Content of Communication according to section.When message communication receiver acquisition is to signal, it is necessary first to which signal is synchronous, then synchronous according to signal
Position carries out the original position of the communication information, then enters row decoding and solution frame, extracts the content of message communication.So signal is same
Step is that message receiver designs very important link.
In current message signal of communication form, synchronous head to duties section frame identification uses and periodically spreads short code, and duties
The corresponding two cycle short codes of each bit in section frame identification part.Before signal synchronization, it is necessary first to solve bit synchronization, find frame mark
The original position of knowledge, frame synchronization is then carried out, find the frame start position of message communication signal.Therefore, message communication signal
Synchronous package contains bit synchronization and frame synchronization.
In the prior art, bit synchronization and improvement typically are carried out by using statistics with histogram or maximum likelihood method, but
While bit synchronization, frame synchronization can not be carried out, while error detection and frame losing are easily caused in the method for statistics with histogram
Phenomena such as；Method by calculating maximum likelihood, in the calculating process of data capacity corresponding to all possible position edge placement
In, selecting maximum value position, in the case where signal conditioning is weak, frame loss rate is higher, is unsatisfactory for frame synchronization probability as original position
Demand.
The content of the invention
The technology of the present invention solves problem：For can not meet to carry out bit synchronization, frame synchronization in the prior art simultaneously
In the case of, it is proposed that a kind of spread-spectrum signal bit synchronization and frame synchronization method for amalgamation processing, avoid the existing histogram of statistics and most
The problem of easy frame losing of maximum-likelihood method, wrong detection.
The present invention technical solution be：
A kind of method for amalgamation processing of spread-spectrum signal bit synchronization and frame synchronization, step are as follows：
(1) the pending spread-spectrum signal in digital signal processing channel is divided into N number of short code week by time interval of time T
Phase, one symbol of setting include E short code cycle, and frame head length is Q, i.e., comprising Q symbol；
(2) since first short code cycle, each symbol is integrated, corresponding symbol correlation is obtained, to every
Individual symbol correlation is demodulated to obtain corresponding symbol sequence of correlation values；
(3) since second short code cycle, each symbol is integrated, corresponding symbol correlation is obtained, to every
Individual symbol correlation is demodulated to obtain corresponding symbol sequence of correlation values；
(4) since the X short code cycle, each symbol is integrated, corresponding symbol correlation is obtained, to each
Symbol correlation is demodulated to obtain corresponding symbol sequence of correlation values, wherein, X numerical value is bigger, and syncretizing effect is better；
(5) the Symbol matching filtering data and correlation energy value matched filtering number of current institute's call sign sequence of correlation values are measured
According to judging whether to reach threshold value, if exceeding threshold value, into step (6), otherwise re-start step (3) or step
(4)；
(6) if step (5) the data obtained exceeds threshold value, the Symbol matching filter of current institute's call sign sequence of correlation values is judged
Whether wave number evidence and correlation energy value matched filtering data are to exceed threshold value first, if so, then being carried out to the current short code cycle
Cross thresholding to identify and latch current sign matched filtering and correlation energy value matched filtering data value, if it is not, then entering step
(7)；
(7) if step (5) the data obtained is not more than threshold value first, carried out with the short code cycle of step (6) mark
Compare, if being more than step (6) latched data value, the short code cycle before is crossed into the cancellation of thresholding mark and marked in currently latch number
At value and short code cycle, if continuously measuring ten times not less than data at thresholding mark are crossed first, stop calculating.
In the step (2), the specific method for obtaining related symbol value sequence is as follows：
Since first short code cycle, the E short code cycle of continuous integral obtains first correlation A1, from E+1
Short code cycle, E short code cycle of continuous integral obtain second correlation A2, the like, an adjacent short code cycle per E
Cumulative corresponding integration correlation AQ, is obtained Q correlation A1, A2 ... AQ, while Q correlation is demodulated
To symbol S1, S2 ... the SQ of Q correlation.
In the step (3), the specific method for obtaining related symbol value sequence is as follows：
Since second short code cycle, the E short code cycle of continuous integral obtains first correlation B1, from E+1
Short code cycle, E short code cycle of continuous integral obtain second correlation B2, the like, an adjacent short code cycle per E
Cumulative corresponding integration correlation BQ, is obtained Q correlation B1, B2 ... BQ, while Q correlation is demodulated
To symbol Y1, Y2 ... the YQ of Q correlation.
In the step (4), the specific method for obtaining related symbol value sequence is as follows：
Since the X short code cycle, the E short code cycle of continuous integral obtains first correlation X1 ,+1 short from X
Code cycle, E short code cycle of continuous integral obtain second correlation X2, the like, per E, an adjacent short code cycle tires out
Add corresponding integration correlation XQ, Q correlation X1, X2 ... XQ is obtained, while Q correlation is demodulated to obtain
Symbol X1, X2 ... the XQ of Q correlation, if X ＞ 2, step (4) is carried out, if X=2, without step (4)；Wherein, X
It is bigger, then calculate Symbol matching filtering data and correlation energy value matched filtering data accuracy is higher.
In the step (5), the symbol sequence of correlation values obtained to step (2), step (3), step (4) carries out symbol
Measured with filtering data, if the matched filtering of measurement the data obtained is-greater-than symbol calculates threshold value, carry out correlation energy value matching
Filtering data measures, no into step (6) if measurement the data obtained is more than correlation energy value matched filtering and calculates threshold value
If then X ＞ 2, step (4) is re-started；If X=2, step (3) is re-started；
In the step (5), calculate Symbol matching filtering data threshold value the step of be：
(a) Symbol matching filtering false dismissal probability is calculated, calculation formula is as follows:
In formula, Pl is false dismissal probability, PeTo receive symbol error probability, s is the preamble sequence length for needing to examine, and k is
Allow the maximum number of mistake during inspection, r is the integration variable of calculus, and excursion is 0~k；
(b) Symbol matching filtering false-alarm probability is calculated, calculation formula is as follows：
In formula, Pf is false-alarm probability；
(c) Symbol matching filtering FER is calculated, calculation formula is as follows：
P=Pl+Pf
In formula, P is that Symbol matching filters FER, as Symbol matching filter threshold value.
In the step (5), the computational methods that energy match filtering calculates threshold value Z are
Z=PO
In formula, O is the average value of accumulated energies in single symbol.
In the step (6), if Symbol matching filtering is calculated in step (5) calculates data and correlation energy value matching filter
Ripple calculates data, and is-greater-than symbol matched filtering first calculates threshold value or correlation energy value matched filtering meter in calculating process
Threshold value is calculated, then records the original position in current short code cycle while latches current sign matched filtering calculating data and correlation energy
Value matched filtering calculates data, and thresholding mark was carried out in the current short code cycle.
The present invention compared with prior art the advantages of be：
(1) the invention provides a kind of spread-spectrum signal bit synchronization and frame synchronization method for amalgamation processing, risen abruptly for each ratio
Beginning there are two kinds of situations in position, and carrying out correlation to two kinds of situations respectively adds up, and then synchronizes detection respectively, now solves
Signal to noise ratio is adjusted to improve, erratum number declines, and drastically increases synchronous probability；Multiple correlation intergals are included for each data bit
The situation in cycle, contrast special original position existing for each case added up, demodulation signal to noise ratio can be improved.
(2) the matched filtering detection of the correlation energy proposed in the present invention needs to be adjusted in good time according to the size of signal power
The size of whole detection threshold, but now signal is shorter into the tenacious tracking time, and accidental fluctuation, decision gate occurs in correlation
Limit sets more difficult, to be filtered by increasing Symbol matching calculating, and the energy match that reduces that can be suitably is filtered to thresholding
Setting requirements.Judgment condition now need to meet that energy match filtering calculates and Symbol matching filtering calculates and is more than thresholding simultaneously,
Improve the synchronous probability of signal；
(3) processing method provided by the invention can be detected bit synchronization simultaneously with frame synchronization, with conventional bit synchronization
Carry out frame synchronization process method afterwards to compare, lock in time shortens.This method is not only adapted to burst spread-spectrum signal, to continuous spread spectrum
Signal is equally applicable, and FPGA realizes that simply, occupancy resource is less, and measured result is preferable.
Brief description of the drawings
Fig. 1 is the frame synchronization and bit synchronization method for amalgamation processing flow chart that invention provides；
Embodiment
A kind of method for amalgamation processing of spread-spectrum signal bit synchronization and frame synchronization, as shown in figure 1, comprising the following steps that：
(1) the pending spread-spectrum signal in digital signal processing channel is divided into N number of short code week by time interval of time T
Phase, a symbol include E short code cycle, and frame head length is Q, i.e., comprising Q symbol；
(2) since first short code cycle, the E short code cycle of continuous integral obtains first correlation A1, from E+1
Individual short code cycle, E short code cycle of continuous integral obtain second correlation A2, the like, an adjacent short code week per E
Phase cumulative corresponding integration correlation AQ, is obtained Q correlation A1, A2 ... AQ, while Q correlation is demodulated
Obtain symbol S1, S2 ... the SQ of Q correlation；
(3) since second short code cycle, the E short code cycle of continuous integral obtains first correlation B1, from E+1
Individual short code cycle, E short code cycle of continuous integral obtain second correlation B2, the like, an adjacent short code week per E
Phase cumulative corresponding integration correlation BQ, is obtained Q correlation B1, B2 ... BQ, while Q correlation is demodulated
Obtain symbol Y1, Y2 ... the YQ of Q correlation；
(4) the like, since the X short code cycle, the E short code cycle of continuous integral obtains first correlation
X1, since+1 short code cycle of X, the E short code cycle of continuous integral obtains second correlation X2, the like, it is individual per E
The corresponding integration correlation XQ of adjacent short code periodic accumulation, is obtained Q correlation X1, X2 ... XQ, while related to Q
Value is demodulated to obtain symbol X1, X2 ... the XQ of Q correlation；
(5) the symbol sequence of correlation values obtained to step (2), step (3), step (4) carries out Symbol matching filtering data
Measurement, if the matched filtering of measurement the data obtained is-greater-than symbol calculates threshold value, carry out correlation energy value matched filtering data and survey
Amount, if measurement the data obtained, which is more than correlation energy value matched filtering, calculates threshold value, into step (6), if otherwise X ＞ 2,
Re-start step (4)；If X=2, step (3) is re-started；
(6) if being calculated in step (5), Symbol matching filtering calculates data and correlation energy value matched filtering calculates data
Is-greater-than symbol matched filtering first calculates threshold value in calculating process or correlation energy value matched filtering calculates threshold value, then
Record the original position in current short code cycle while latch current sign matched filtering and calculate data and correlation energy value matching filter
Ripple calculates data, and thresholding mark was carried out in the current short code cycle；
(7) if step (5) the data obtained is not more than threshold value first, carried out with the short code cycle of step (6) mark
Compare, if being more than step (6) latched data value, the short code cycle before is crossed into the cancellation of thresholding mark and marked in currently latch number
At value and short code cycle, if continuously measuring ten times not less than data at thresholding mark are crossed first, stop calculating.
Wherein, in the step (5), Symbol matching filtering thresholding it is relevant with FER index, FER mainly by
Two performance indications are formed, and the step of calculating Symbol matching filtering data threshold value is：
(a) Symbol matching filtering false dismissal probability is calculated, calculation formula is as follows:
In formula, Pl is false dismissal probability, PeTo receive symbol error probability, s is the preamble sequence length for needing to examine, and k is
Allow the maximum number of mistake during inspection, r is the integration variable of calculus, and excursion is 0~k；
(b) Symbol matching filtering false-alarm probability is calculated, calculation formula is as follows：
In formula, Pf is false-alarm probability；
Comparison step (a) is understood with step (b), and when decision condition relaxes, i.e. when k increases, false dismissal probability reduces, but empty
Alarm probability increases.FER be equal to the cumulative of loss and false alarm rate and；
(c) Symbol matching filtering FER is calculated, calculation formula is as follows：
P=Pl+Pf
In formula, P is that Symbol matching filters FER, as Symbol matching filter threshold value.
In the step (5), the computational methods that energy match filtering calculates threshold value Z are
Z=PO
In formula, O is the average value of accumulated energies in single symbol.
In the step (7), result of calculation is filtered first from Symbol matching filtering result of calculation with correlation energy match
Start more than pseudo-code original position corresponding to threshold value, original position postpones successively, postpones E-1 short code cycle altogether, selects defeated
Go out the maximum of E correlation energy match filtering result of calculation, while export short code cycle initial position, now, signal position
It is synchronous simultaneously synchronous successful with frame synchronization.
Further illustrated with reference to specific embodiment：
As the long 31ms of frame head, when a symbol lengths are 1ms, loss, false alarm rate and FER and the pass of fault-tolerant number
System's figure is as follows：
The relation of FER and fault-tolerant number during the frame head of table 1 long 31ms
| Fault-tolerant number | False dismissal probability | False-alarm probability | FER |
| 3 | 3.2×10-3 | 2.3×10-6 | 3.2×10-3 |
| 4 | 3.4×10-4 | 1.7×10-5 | 3.6×10-4 |
| 5 | 2.9×10-5 | 9.6×10-5 | 1.3×10-4 |
, it is necessary to filter false dismissal probability calculation formula and Symbol matching filtering false-alarm probability to Symbol matching in Practical Project
Calculation formula is emulated, and obtains upper table, according to the FER index of upper table simulation calculation compared with actual items, is selected fault-tolerant
FER corresponding to number is less than engineering objective, wherein, energy match filter threshold determines that method is：
It is the average value that Symbol matching filtering calculates thresholding and single symbol accumulated energies that energy match filtering, which calculates thresholding,
Obtain product.Wherein, the average value of the single symbol accumulated energies obtains in Practical Project, and each short code sequence cycle is corresponding
Average energy O.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (5)
1. the method for amalgamation processing of a kind of spread-spectrum signal bit synchronization and frame synchronization, it is characterised in that step is as follows：
(1) pending spread-spectrum signal is divided into N number of short code cycle by time interval of time T, it is short comprising E sets a symbol
The code cycle；
(2) since first short code cycle, each symbol is integrated, corresponding symbol correlation is obtained, to each symbol
Number correlation be demodulated to obtain corresponding to symbol sequence of correlation values, symbol sequence of correlation values length is designated as Q, i.e., comprising Q
Symbol；
(3) since second short code cycle, each symbol is integrated, corresponding symbol correlation is obtained, to each symbol
Number correlation be demodulated to obtain corresponding to symbol sequence of correlation values；
(4) since the X short code cycle, each symbol is integrated, corresponding symbol correlation is obtained, to each symbol
Correlation is demodulated to obtain corresponding symbol sequence of correlation values, wherein, X is the positive integer more than 2；
(5) the Symbol matching filtering data and correlation energy value matched filtering data of current institute's call sign sequence of correlation values are measured,
And if only if Symbol matching filtering data and correlation energy value matched filtering data exceed threshold value, then no into step (6)
The value for then changing X re-starts step (4)；
(6) if step (5) the data obtained exceeds threshold value, the Symbol matching filtering number of current institute's call sign sequence of correlation values is judged
According to and correlation energy value matched filtering data whether be to exceed threshold value first, if so, then being carried out to the current short code cycle
Thresholding identifies and latches current sign matched filtering and correlation energy value matched filtering data value, if it is not, then entering step
(7)；
(7) by the Symbol matching filtering data of current institute's call sign sequence of correlation values and correlation energy value matched filtering data and step
Suddenly (6) latch data is compared respectively, and two kinds of matched filtering data that and if only if are respectively more than step (6) latched data value
When, then the short code cycle crosses the cancellation of thresholding mark and marks at the current short code cycle and latch current matching filtering data by before
Value.
2. the method for amalgamation processing of a kind of spread-spectrum signal bit synchronization according to claim 1 and frame synchronization, it is characterised in that：
In the step (2), the specific method for obtaining related symbol value sequence is as follows：
Since first short code cycle, the E short code cycle of continuous integral obtains first correlation A1, from the E+1 short code
Cycle, E short code cycle of continuous integral obtain second correlation A2, the like, an adjacent short code periodic accumulation per E
Corresponding integration correlation AQ, is obtained Q correlation A1, A2 ... AQ, while Q correlation is demodulated to obtain Q
Symbol S1, S2 ... the SQ of individual correlation.
3. the method for amalgamation processing of a kind of spread-spectrum signal bit synchronization according to claim 1 and frame synchronization, it is characterised in that：
In the step (5), calculate Symbol matching filtering data threshold value the step of be：
(a) Symbol matching filtering false dismissal probability is calculated, calculation formula is as follows:
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<mo>-</mo>
<munderover>
<mo>&Sigma;</mo>
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</mrow>
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</munderover>
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<mi>s</mi>
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</msubsup>
<msup>
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<mi>P</mi>
<mi>e</mi>
</msub>
<mi>r</mi>
</msup>
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<mo>(</mo>
<mn>1</mn>
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</mrow>
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</msup>
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In formula, Pl is false dismissal probability, PeTo receive symbol error probability, s is the preamble sequence length for needing to examine, when k is examines
Allow the maximum number of mistake, r is the integration variable of calculus, and excursion is 0~k；
(b) Symbol matching filtering false-alarm probability is calculated, calculation formula is as follows：
<mrow>
<mi>P</mi>
<mi>f</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msubsup>
<mo>&Sigma;</mo>
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</mfrac>
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In formula, Pf is false-alarm probability；
(c) Symbol matching filtering FER is calculated, calculation formula is as follows：
P=Pl+Pf
In formula, P is that Symbol matching filters FER, as Symbol matching filter threshold value.
4. the method for amalgamation processing of a kind of spread-spectrum signal bit synchronization according to claim 3 and frame synchronization, it is characterised in that：
In the step (5), the computational methods that energy match filtering calculates threshold value Z are
Z=PO
In formula, O is the average value of accumulated energies in single symbol.
5. the method for amalgamation processing of a kind of spread-spectrum signal bit synchronization according to claim 1 and frame synchronization, it is characterised in that：
In the step (7), Symbol matching filtering data and correlation energy value matched filtering to current institute's call sign sequence of correlation values
Compared with data carry out ten times calculating with step (6) latch data, if stopping calculating without departing from step (6) latched data value.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6501786B1 (en) * | 1997-03-18 | 2002-12-31 | Sharp Kabushiki Kaisha | Direct spread spectrum communication system corresponding to delayed multiplex mode, and method of communication using the system |
| CN101594180A (en) * | 2009-06-30 | 2009-12-02 | 北京华力创通科技股份有限公司 | The bit synchronization of the text of receiver and frame synchronization implementation method and device |
| CN103607268A (en) * | 2013-11-25 | 2014-02-26 | 中国航天科工集团第三研究院第八三五七研究所 | Bit synchronization and frame synchronization joint detection method of 4CPM signal |
-
2017
- 2017-11-21 CN CN201711166208.0A patent/CN107864032B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6501786B1 (en) * | 1997-03-18 | 2002-12-31 | Sharp Kabushiki Kaisha | Direct spread spectrum communication system corresponding to delayed multiplex mode, and method of communication using the system |
| CN101594180A (en) * | 2009-06-30 | 2009-12-02 | 北京华力创通科技股份有限公司 | The bit synchronization of the text of receiver and frame synchronization implementation method and device |
| CN103607268A (en) * | 2013-11-25 | 2014-02-26 | 中国航天科工集团第三研究院第八三五七研究所 | Bit synchronization and frame synchronization joint detection method of 4CPM signal |
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