CN106788958A - Signal synchronizing method and system - Google Patents
Signal synchronizing method and system Download PDFInfo
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- CN106788958A CN106788958A CN201510813375.4A CN201510813375A CN106788958A CN 106788958 A CN106788958 A CN 106788958A CN 201510813375 A CN201510813375 A CN 201510813375A CN 106788958 A CN106788958 A CN 106788958A
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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
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
- H04J13/14—Generation of codes with a zero correlation zone
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- Computer Networks & Wireless Communication (AREA)
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- Synchronisation In Digital Transmission Systems (AREA)
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Abstract
The present invention provides a kind of signal synchronizing method and system.According to methods described, emitter generates short sequence and sequence long according to the bandwidth of the targeting signal to be sent；By the targeting signal modulation successively comprising sequence long described in multiple described short sequences and at least one for repeating to communication channel, and sent.Receiver detects whether that the signal of communications satellite can be obtained, and receives the targeting signal；If so, then utilizing search window, each short EOS position is searched for, and carry out thick synchronization；If it is not, then sliding default search window in Preset Transfer duration, the baseband signal received in the transmission duration is traveled through, search for each short EOS position, and thick synchronization is carried out based on each short EOS position；Cross-correlation is carried out to the sequence long for being received again, signal synchronization is further carried out based on resulting cross-correlation peak value.The present invention solves the problems, such as that synchronous inaccurate, operand is big in the prior art.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of signal synchronizing method and system.
Background technology
Simultaneous techniques is a key technology in communication system, is the premise for setting up communication link.Especially for
Self-organizing network, be synchronously the first step first have to solve problem.Common synchronous method has based on training sequence
Row and blind synchronization scenario.
Wherein, the Preamble synchronization scenarios based on 802.16e standards use three approximately uniform numbers of time domain
According to composition, it is caused to carry out thin net synchronization capability not enough, and relative computing is complicated.
And the scheme of blind search is carried out using OFDM symbol Cyclic Prefix characteristic, initial synchronization search
Time is long.Particularly under without GPS scenes, its operand is big, and is easily disturbed influence, causes same
Step is unreliable.
Accordingly, it would be desirable to be improved to prior art.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of signal synchronizing method
And system, for solving the problems, such as that synchronous inaccurate, operand is big in the prior art.
In order to achieve the above objects and other related objects, the present invention provides a kind of signal synchronizing method, for sending out
Machine is penetrated, including：According to the bandwidth of the targeting signal to be sent, short sequence and sequence long are generated；Will successively
Targeting signal modulation comprising sequence long described in multiple described short sequences and at least one for repeating is believed to communication
Road, and sent.
Preferably, the channel width according to the targeting signal to be sent, generates the mode bag of short sequence
Include：N will be inserted in a default ZC sequences under frequency domainP0-LenshortZCIndividual 0, and time domain sequences are converted into,
Obtain the short sequence；Wherein, Np0It is the length of the short sequence, LenshartZCIt is related to the bandwidth
Value.
Preferably, the channel width according to the targeting signal to be sent, generates the mode bag of sequence long
Include：N will be inserted in default 2nd ZC sequences under frequency domainp1-LenshortZCIndividual 0, time domain sequences are converted into,
And the identification information for corresponding to receiver is added in the time domain sequences, obtain the sequence long；Wherein, Np1
It is the length of the sequence long, LenshartZCIt is the value related to the bandwidth.
Based on above-mentioned purpose, the present invention also provides a kind of signal synchronizing method, for receiver, including：Inspection
Whether survey can obtain the signal of communications satellite, and the letter of the base band comprising targeting signal that receiver/transmitter sends
Number；If so, by preset search window in the baseband signal that will then be received, search meets default short sequence weight
Again each short EOS position counting, meeting default short sequence signature, and based on each short sequence knot
Beam position, is carried out thick synchronous with the emitter；If it is not, then sliding default searching in Preset Transfer duration
Rope window, travels through the baseband signal received in the transmission duration, and search meets default short tandem repeats number of times
, each short EOS position for meeting default short sequence signature, and based on each short EOS position,
Carried out with the emitter thick synchronous；Based on resulting short EOS position, the targeting signal is determined
Middle sequence long, and the sequence long that will be received carries out cross-correlation with default sequence long；Based on resulting mutual
It is synchronous that correlation peak further carries out signal with the emitter.
Preferably, it is described carefully same with the emitter when the signal for having not been able to acquisition communications satellite is detected
The step of step, includes：Based on the identified thin EOS position, the clock letter that adjustment crystal oscillator is exported
Number.
Preferably, it is described that default search window is slided in Preset Transfer duration, travel through in the transmission duration
The baseband signal for being received, search meet default short tandem repeats number of times, meet default short sequence signature
The mode of each short EOS position includes：Preset search window is slided in Preset Transfer duration, search meets
Preset the multiple short EOS position of short sequence signature；It is many from what is searched according to default screening conditions
The short EOS position of default short tandem repeats number of times is filtered out in individual short EOS position.
Preferably, it is described search for meet default short tandem repeats number of times, meet default short sequence signature it is each
The mode of short EOS position includes：Auto-correlation is carried out to two baseband signals in the slipped over search window
Treatment, and obtain the peak envelope waveform corresponding to the autocorrelation result；It is special that selection meets the short sequence
Short EOS position corresponding to the peak envelope waveform levied.
Based on above-mentioned purpose, the present invention also provides a kind of signal synchronizing method, for transmitter and receiver institute
In the system of composition, including：The emitter sends targeting signal according to as above any described method；Institute
State receiver and receive the targeting signal that the emitter is launched, and carried out according to as above any described method
Signal synchronization.
Based on above-mentioned purpose, the present invention also provides a kind of emitter, including：Generation module, for according to institute
The bandwidth of the targeting signal to be sent, generates short sequence and sequence long；Transmitter module, for that will include successively
Communication channel is arrived in the targeting signal modulation of sequence long described in the described short sequence and at least one that multiple is repeated, and
Sent.
Preferably, the generation module is used to be inserted in the default ZC sequences under frequency domain
NP0-LenshortZCIndividual 0, and time domain sequences are converted into, obtain the short sequence；Wherein, Np0For described short
The length of sequence, LenshartZCIt is the value related to the bandwidth.
Preferably, the generation module is used to be inserted in the default 2nd ZC sequences under frequency domain
Np1-LenshortZCIndividual 0, time domain sequences are converted into, and correspondence receiver is added in the time domain sequences
Identification information, obtains the sequence long；Wherein, Np1It is the length of the sequence long, LenshartZCIt is and institute
State the related value of bandwidth.
Based on above-mentioned purpose, the present invention also provides a kind of receiver, including：Receiver module, be for detecting
The no signal that can obtain communications satellite, and the baseband signal comprising targeting signal that receiver/transmitter sends；
If so, then performing the first thick synchronization module；If it is not, then performing the second thick synchronization module；Described first is thick same
Step module is used in the baseband signal that will be received by preset search window, and search meets default short tandem repeats
Number of times, each short EOS position that meets default short sequence signature, and based on each short EOS
Position, is carried out thick synchronous with the emitter；The second thick synchronization module is used in Preset Transfer duration
Default search window is slided, the baseband signal received in the transmission duration is traveled through, search meets default short
Sequence repetition number, each short EOS position that meets default short sequence signature, and based on each described short
EOS position, is carried out thick synchronous with the emitter；Thin synchronization module, for based on resulting short
EOS position, determines sequence long in the targeting signal, and the sequence long that will be received and default length
Sequence carries out cross-correlation；Signal is further carried out with the emitter based on resulting cross-correlation peak value synchronous.
Preferably, when it is described detect have not been able to obtain communications satellite signal when, the thin synchronization module is also
For the clock signal exported based on the identified thin EOS position, adjustment crystal oscillator.
Preferably, the described second thick synchronization module is additionally operable to：Preset search window is slided in Preset Transfer duration,
Search meets the multiple short EOS position of default short sequence signature；According to default screening conditions, from institute
The short EOS position of default short tandem repeats number of times is filtered out in the multiple short EOS position searched
Put.
Preferably, the described first thick synchronization module and the second thick synchronization module are used for the slipped over search window
Two interior baseband signals carry out auto-correlation processing, and obtain the peak envelope ripple corresponding to the autocorrelation result
Shape；Selection meets the short EOS position corresponding to the peak envelope waveform of the short sequence signature.
Based on above-mentioned purpose, the present invention also provides a kind of signal synchronizing system, including：As above it is any described
Emitter；And, as above in any described receiver.
As described above, signal synchronizing method of the invention and system, have the advantages that：Emitter is only
Foundation bandwidth generates short sequence, and sequence long is generated based on bandwidth and base station number, can obtain with preferably certainly
The signal of correlation, is easy to receiver to be identified；Multiple short sequence and a sequence long that emitter will be repeated
Row are sent to receiver as targeting signal, and receiver utilizes auto-correlation computation, and according to the short of repetition identification
Sequence location, quickly can be carried out with emitter it is thick synchronous, on the basis of thick synchronization recycle computing answer
Miscellaneous computing cross-correlation is synchronous further to carry out signal with emitter, improves between transmitter and receiver
Synchronizing speed and synchronization reliability；In addition, receiver is according to whether can receive satellite-signal to select
The different methods of synchronization are selected, for being conducive to the receiver to satellite-signal can be received, synchronous fortune is reduced
Calculation amount, while for the receiver that can not receive satellite-signal, accurately searching for short sequence location, subtracts
Few synchronism deviation, for follow-up signal treatment provides accurate synchronised clock；Further, using ZC sequences, energy
The Autocorrelation envelop waveform for becoming apparent enough is provided, is easy to receiver to recognize short sequence location；Especially for not
The receiver of satellite-signal can be received, when thick synchronous, crystal oscillator is adjusted, clock signal deviations are can solve the problem that
In the case of larger, the problem that follow-up adjustment circuit cannot be synchronous.
Brief description of the drawings
Fig. 1 is shown as the flow chart of signal synchronizing method of the invention.
Fig. 2 is shown as the structural representation of signal synchronizing system of the invention.
Specific embodiment
Embodiments of the present invention are illustrated below by way of specific instantiation, those skilled in the art can be by this
Content disclosed by specification understands other advantages of the invention and effect easily.The present invention can also pass through
Different specific embodiments is embodied or practiced in addition, and the various details in this specification can also be based on
Different viewpoints and application, without departing from the spirit of the present invention carry out various modifications or alterations.
As shown in figure 1, the present invention provides a kind of signal synchronizing method.The signal synchronizing method is main by sending out
System that machine and receiver constituted is penetrated to perform.Wherein, the transmitter and receiver is located at difference respectively
Base station in, or respectively be located at base station and mobile terminal in.Can be gathered around simultaneously in the base station and mobile terminal
There is the transmitter and receiver, emitter therein is used to send leading letter to other base stations or mobile terminal
Number, receiver therein is used to receive the targeting signal of other base stations.The emitter can be with multiple receivers
Signal synchronization is carried out by launching corresponding targeting signal.
Wherein, before carrying circulation comprising continuous multiple short sequence P0 of repetition and one in the targeting signal
Sew the sequence P1 long of CP.The emitter targeting signal that S11 and S12 will be generated in accordance with the following steps
Send.Here, the emitter can regularly send the targeting signal, it is also possible to according in advance with connect
The startup time that receipts machine is reached sends the targeting signal.For example, the emitter is before paging information is sent
Send the targeting signal.S21-S25 is based on received targeting signal to the receiver in accordance with the following steps
Signal synchronization is carried out, accurately to receive the follow-up signal with data.Here, the receiver can be determined
When the reception targeting signal.
In step s 11, the emitter generates short sequence according to the bandwidth of the targeting signal to be sent
With sequence long.
Specifically, the emitter is according to channel bands, the channel institute energy to be launched the targeting signal
The signal bandwidth of transmission generates short sequence P0 and sequence P1 long.Wherein, the short sequence P0 and sequence long
P1 may each be the customized sequence with preferable autocorrelation characteristic.Preferably, the emitter base
The short sequence P0 and sequence P1 long is generated in ZC sequences and bandwidth.Wherein, the emitter generation is short
The ZC sequences used during sequence P0 and sequence P1 long can be with identical, it is also possible to different.
Here, the emitter will insert N in the default ZC sequences under frequency domainP0-LenshortZCIndividual 0,
And time domain sequences are converted into, obtain the short sequence；Wherein, Np0It is the length of the short sequence, citing
It is 256bit；LenshartZCIt is the value related to the bandwidth.
For example, pre-set bandwidths and length Len in the emittershartZCTable 1：
Table 1
The emitter selects corresponding signal bandwidth according to the channel bands to be launched；Meanwhile, it is described
The ZC sequences of frequency domain the are preset with emitter, it is defined as：0≤m≤NZC-1
Here, the q in the P0 sequences takes 1, the emitter is by xqM () interleaves in a frequency domain
256-LenshortZCX is obtained after individual 0, IFFTm_p0(m) sequence, then P0 sequences be：
P0 (m)=xm_p0(m)0≤m≤255。
Meanwhile, the emitter also generates sequence P1 long based on bandwidth.Here, the emitter is in sequence long
The identification information (such as numbering ID of receiver) of receiver is should also contain in row P1.So, the hair
Penetrating machine will insert N in the default 2nd ZC sequences under frequency domainp1-LenshortZCIndividual 0, time domain sequences are converted into,
And the identification information for corresponding to receiver is added in the time domain sequences, obtain the sequence long；Wherein, Np1
It is the length of the sequence long, LenshartZCIt is the value related to the bandwidth.
Here, the generation of the P1 is similar with P0, referring to table 2 below, the emitter is second for its q value
ZC sequence intermediate interpolateds 512-LenshortZCIndividual 0, then, to interpolation after the 2nd ZC sequence memories IFFT
Computing, obtains xm_p1(n), then P1 sequences be：P1 (n)=xm_p1(n)0≤n≤511。
Q values in the P1 sequences of table 2
So that the emitter can simultaneously connect 64 receivers as an example：
PrmRootTab [64]=
{3,4,5,6,7,9,10,11,14,15,16,20,22,24,25,26,28,32,34,36,37,38,40,41,42,43,44,46,47,
48,49,50,
60,61,62,63,64,66,67,68,69,72,75,77,78,80,86,87,88,89,90,93,96,97,99,102,10
3,106,108,109,113,114,118,120}；
Before the cyclic prefix CP and sequence P1 long of three P0, P1 that the emitter will be generated are combined into
Signal is led, and performs step S12.
In step s 12, the emitter is by successively comprising multiple described short sequences and at least one for repeating
The targeting signal modulation of the sequence long is sent to communication channel.For example, the targeting signal according to
The secondary described short sequences comprising multiple repetitions, the Cyclic Prefix of the sequence long and the sequence long.
The emitter is by the channel of the modulates baseband signals comprising the targeting signal to the correspondence bandwidth
Frequency range, and launched by transmitting antenna.
In the step s 21, the receiver detects whether to obtain from before receiving the targeting signal
The signal of communications satellite.
Here, the receiver adjusts itself using the clock signal for receiving communications satellite (such as position location satellite)
Crystal oscillator clock, with realize it is synchronous with the clock of respective satellite.
When the receiver can obtain the signal for taking communications satellite, step S22 is performed；Conversely, performing
Step S23.
In step S22, by preset search window in the baseband signal that the receiver will be received, search
Each short EOS position meeting default short tandem repeats number of times, meeting default short sequence signature, and base
In each short EOS position, carried out with the emitter thick synchronous.
Specifically, the baseband signal that the receiver will be received successively passes through the search window, according to default
Short sequence signature the baseband signal in the search window is matched, wherein, every time when the match is successful,
The receiver can obtain corresponding short EOS position.When the number of times that the match is successful reaches the short sequence
During row number of repetition, the receiver determines last short EOS position in the preamble sequence.Institute
State the length and default short sequence signature between receiver adjacent short EOS position according to determined by
In short sequence pair answer baseband signal length comparative result, verify that last short EOS position is
It is no correct；If the comparative result is in default error range, according to last short EOS position,
The clock signal exported to the crystal oscillator of itself carries out the treatment such as Phase Tracking, same with the emitter to realize
The purpose of step；Conversely, then proceeding matching.Synchronization now is thick synchronous, and the receiver is also performed
Step S24.
Preferably, it is described search for meet default short tandem repeats number of times, meet default short sequence signature it is each
The mode of short EOS position is comprised the following steps：(being unillustrated)
In step S221, the receiver is carried out certainly to two baseband signals in the slipped over search window
Relevant treatment, and obtain the peak envelope waveform corresponding to the autocorrelation result.
In step S222, the receiver selection meets the peak envelope waveform institute of the short sequence signature
Corresponding short EOS position.
Here, the short sequence signature is included but is not limited to：Peak envelope waveform corresponding to autocorrelation result,
The ripple corresponding to average peak and average valley, the short EOS position in the peak envelope waveform
Shape thresholding etc..
Specifically, the receiver baseband signal discrete to the two adjacent groups in the search window that is slipped over is carried out
Auto-correlation computation, and obtain the peak envelope waveform corresponding to the autocorrelation result.The receiver according to
The characteristic peaks envelope waveform in short sequence signature is preset, ripple is chosen from resulting each peak envelope waveform
The waveform that shape is consistent.Then, by the base band letter at the correspondence waveform thresholding in selected waveform trailing edge
Number, it is defined as an end position for short sequence.By that analogy, the receiver is obtained and default short sequence
The corresponding each short EOS position of the number of repetition of row.Based on each short EOS position, with
The emitter is carried out after thick synchronization, and the receiver performs step S24.
In step S23, the receiver slides default search window in Preset Transfer duration, travels through institute
State the baseband signal that is received in transmission duration, search meet default short tandem repeats number of times, meet default
Each short EOS position of short sequence signature, and based on each short EOS position, with the transmitting
Machine carries out thick synchronization.
Here, from unlike step S22, the baseband signal that the receiver will be received is according to default biography
Defeated duration is split, and slides default search window in each transmission duration, travels through the transmission duration
Interior received baseband signal.Wherein, receiver slip scan window in each transmission duration is searched for
The mode of each short EOS position meeting default short tandem repeats number of times, meeting default short sequence signature
It is same or similar with step S22, will not be described in detail herein.
The receiver is based on each short EOS position, and thick synchronous mode is carried out with the emitter
Also it is same or similar with step S22, will not be described in detail herein.
In step s 24, the receiver is based on resulting short EOS position, determines described leading
Sequence long in signal, and the sequence long that will be received carries out cross-correlation with default sequence long.
Specifically, the receiver is using the next frame of last short EOS position as the sequence long
Original position, and the sequence long that will be received carries out computing cross-correlation with default sequence long.Preferably,
It is also comprising the cyclic prefix CP by sequence long between short sequence and sequence long in the targeting signal, then described
Receiver carries out CP and operates according to default CP length to the targeting signal, then the base that will be gone after CP
Band signal and is carried out mutually it with default sequence long as the original position of sequence long in the targeting signal
Related operation, and obtain the envelope waveform that cross-correlation peak value is constituted.
In step s 25, the receiver be based on resulting cross-correlation peak value further with the emitter
Carry out signal synchronization.
Specifically, whether the envelope waveform of the cross-correlation peak value obtained by the receiver judges is greater-than match pre-
If envelope waveform feature；If, it is determined that the baseband signal corresponding to the peak-peak is the sequence long
The end position of row, and further adjustment is same with the signal of emitter according to resulting EOS position long
Step；If it is not, then slide the baseband signal, and using the baseband signal after slip as sequence long start bit
Put, repeating the sequence long that will be received in step S24 carries out the step of cross-correlation with default sequence long
Suddenly.
Preferably, when cross-correlation peak value determined by the receiver is for multiple, the thin synchronization module is pressed
According to default screening rule, EOS position long is therefrom selected, and the letter with emitter is carried out with this position
Number synchronization.For example, be ranked up for multiple cross-correlation peak values by the receiver, cross-correlation peak value is chosen maximum
Position be the sequence long end position.The receiver EOS position long based on determined by again
Carry out signal synchronization.
If including multiple sequences long in the targeting signal, the receiver can also be according to multiple sequences long
The length between EOS position each long corresponding to cross-correlation peak value, determines last EOS long
Position, and based on identified end position adjustment phase lock circuitry, frequency divider etc., to realize and emitter
Signal synchronization.
Here, when the receiver fails the signal for getting satellite, also based on the EOS position long
Put, carried out with the emitter thin synchronous.Specifically, receiver sequence long based on determined by
End position, the clock signal that adjustment crystal oscillator is exported.For example, receiver sequence long according to determined by
Row end position, the phase of the clock signal that delay/advance inside crystal oscillator is exported.
As shown in Fig. 2 the present invention provides a kind of signal synchronizing system.The signal synchronizing system includes transmitting
Machine 1 and receiver 2.Wherein, the emitter 1 and receiver 2 are located in different base stations respectively, or
Person is located in base station and mobile terminal respectively.The emitter can simultaneously be possessed in the base station and mobile terminal
1 and receiver 2, emitter therein 1 is used to send targeting signal to other base stations or mobile terminal, its
In receiver 2 be used to receive the targeting signal of other base stations.The emitter 1 can be with multiple receivers 2
Signal synchronization is carried out by launching corresponding targeting signal.
Wherein, before carrying circulation comprising continuous multiple short sequence P0 of repetition and one in the targeting signal
Sew the sequence P1 long of CP.To construct signal synchronizing system of the present invention, the emitter 1 includes：It is raw
Into module 11, transmitter module 12.The receiver 2 includes：Receiver module 21, the first thick synchronization module
22nd, the second thick synchronization module 23, thin synchronization module 24.
Here, the transmitter module 12 can regularly send the targeting signal, it is also possible to according in advance with connect
The startup time that receipts machine 2 is reached sends the targeting signal.For example, the transmitter module 12 is sought in transmission
The targeting signal is sent before exhaling information.Each module in the receiver 2 is based on received targeting signal
Signal synchronization is carried out, accurately to receive the follow-up signal with data.
The generation module 11 is used for the bandwidth according to the targeting signal to be sent, and generates short sequence and length
Sequence.
Specifically, the generation module 11 is according to channel bands, the letter to be launched the targeting signal
The signal bandwidth that road can be transmitted generates short sequence P0 and sequence P1 long.Wherein, the short sequence P0 and
Sequence P1 long may each be the customized sequence with preferable autocorrelation characteristic.Preferably, the life
ZC sequences are based on into module 11 and bandwidth generates the short sequence P0 and sequence P1 long.Wherein, the life
The ZC sequences used when generating short sequence P0 and sequence P1 long into module 11 can be with identical, it is also possible to
It is different.
Here, the generation module 11 will insert N in the default ZC sequences under frequency domainP0-LenshortZCIt is individual
0, and time domain sequences are converted into, obtain the short sequence；Wherein, Np0It is the length of the short sequence, lifts
Example is 256bit；LenshartZCIt is the value related to the bandwidth.
For example, pre-set bandwidths and length Len in the generation module 11shartZCTable 3：
Table 3
The generation module 11 selects corresponding signal bandwidth according to the channel bands to be launched；Meanwhile,
The ZC sequences of frequency domain the are preset with the generation module 11, it is defined as：0≤m≤NZC-1
Here, the q in the P0 sequences takes 1, the generation module 11 is by xqM () interleaves in a frequency domain
256-LenshortZCX is obtained after individual 0, IFFTm_p0(m) sequence, then P0 sequences be：
P0 (m)=xm_p0(m)0≤m≤255。
Meanwhile, the generation module 11 also generates sequence P1 long based on bandwidth.Here, the generation module
11 identification informations (such as numbering ID of receiver 2) that receiver 2 is should also contain in sequence P1 long.
So, the generation module 11 will insert N in the default 2nd ZC sequences under frequency domainp1-LenshortZCIndividual 0,
Time domain sequences are converted into, and the identification information of correspondence receiver 2 is added in the time domain sequences, obtain institute
State sequence long；Wherein, Np1It is the length of the sequence long, LenshartZCIt is the value related to the bandwidth.
Here, the generation of the P1 is similar with P0, its q value referring to table 4 below, the generation module 11
In the 2nd ZC sequence intermediate interpolateds 512-LenshortZCIndividual 0, then, to interpolation after the 2nd ZC sequences note
Property IFFT computings, obtain xm_p1(n), then P1 sequences be：P1 (n)=xm_p1(n)0≤n≤511。
Q values in the P1 sequences of table 4
So that the generation module 11 can simultaneously connect 64 receivers 2 as an example：
PrmRootTab [64]=
{3,4,5,6,7,9,10,11,14,15,16,20,22,24,25,26,28,32,34,36,37,38,40,41,42,43,44,46,47,
48,49,50,
60,61,62,63,64,66,67,68,69,72,75,77,78,80,86,87,88,89,90,93,96,97,99,102,10
3,106,108,109,113,114,118,120}；
The cyclic prefix CP and sequence P1 groups long of three P0, P1 that the generation module 11 will be generated
Synthesis targeting signal, and perform transmitter module 12.
The transmitter module 12 is used for successively comprising described in multiple described short sequences and at least one for repeating
The targeting signal modulation of sequence long is sent to communication channel.For example, the targeting signal is wrapped successively
Containing multiple described short sequences for repeating, the Cyclic Prefix of the sequence long and the sequence long.
The timing of the transmitter module 12, based on default entry condition, by comprising the targeting signal
Modulates baseband signals and are launched to the channel bands of the correspondence bandwidth by transmitting antenna.
Receiver 2 in the correspondence sequence long is numbered, and the receiver module 21 in corresponding receiver 2 is certainly
Before receiving the targeting signal, detect whether that the signal of communications satellite can be obtained.
Here, including satellite positioning module, antenna array, signal down circuit in the receiver module 21
Deng.
The receiver module 21 adjusts itself using the clock signal for receiving communications satellite (such as position location satellite)
Crystal oscillator clock, with realize it is synchronous with the clock of respective satellite.
When the receiver module 21 can obtain the signal for taking communications satellite, the first thick synchronization module is driven
22；Conversely, driving the second thick synchronization module 23.
The first thick synchronization module 22 is used in the baseband signal that will be received by preset search window, searches
Each short EOS position that Suo Fuhe presets short tandem repeats number of times, meeting default short sequence signature, and
Based on each short EOS position, carried out with the emitter 1 thick synchronous.
Specifically, the baseband signal that the described first thick synchronization module 22 will be received successively is by the search
Window, matches according to default short sequence signature to the baseband signal in the search window, wherein, every time
When the match is successful, the first thick synchronization module 22 can obtain corresponding short EOS position.When
When reaching the short tandem repeats number of times with successful number of times, the first thick synchronization module 22 determines described
Last short EOS position in preamble sequence.The first thick synchronization module 22 is according to identified
The short sequence pair in length and default short sequence signature between adjacent short EOS position answers base band to believe
Number length comparative result, verify whether last short EOS position correct；If described compare knot
In default error range, then according to last short EOS position, the crystal oscillator to itself is exported fruit
Clock signal carry out Phase Tracking etc. treatment, to realize the purpose synchronous with the emitter 1；Conversely,
Then proceed matching.Synchronization now is thick synchronous, and the first thick synchronization module 22 further drives
Thin synchronization module 24.
Preferably, it is described search for meet default short tandem repeats number of times, meet default short sequence signature it is each
The mode of short EOS position is comprised the following steps：
Two baseband signals that the first thick synchronization module 22 pairs is slipped in the search window carry out auto-correlation
Treatment, and obtain the peak envelope waveform corresponding to the autocorrelation result.
The selection of first thick synchronization module 22 meets corresponding to the peak envelope waveform of the short sequence signature
Short EOS position.
Here, the short sequence signature is included but is not limited to：Peak envelope waveform corresponding to autocorrelation result,
The ripple corresponding to average peak and average valley, the short EOS position in the peak envelope waveform
Shape thresholding etc..
Specifically, the two adjacent groups in 22 pairs of search windows for being slipped over of the described first thick synchronization module are discrete
Baseband signal carries out auto-correlation computation, and obtains the peak envelope waveform corresponding to the autocorrelation result.Institute
The first thick synchronization module 22 is stated according to the characteristic peaks envelope waveform preset in short sequence signature, from resulting
Each peak envelope waveform in choose the waveform that is consistent of waveform.Then, will be right in selected waveform trailing edge
The baseband signal at the waveform thresholding is answered, is defined as an end position for short sequence.By that analogy, institute
State the first thick synchronization module 22 and obtain each short EOS corresponding with the number of repetition of default short sequence
Position.Based on each short EOS position, with the emitter 1 carry out it is thick it is synchronous after, it is described
First thick synchronization module 22 drives thin synchronization module 24.
The second thick synchronization module 23 is used to slide default search window in Preset Transfer duration, travels through
The baseband signal received in the transmission duration, search meet default short tandem repeats number of times, meet pre-
If each short EOS position of short sequence signature, and based on each short EOS position, with the hair
Penetrating machine 1 carries out thick synchronization.
Here, from unlike the first thick synchronization module 22, the second thick synchronization module 23 will be received
Baseband signal split according to Preset Transfer duration, and each transmission duration in slide default search
Window, travels through the baseband signal received in the transmission duration.Wherein, the described second thick synchronization module 23
Each transmission duration in slip scan window come search for meet default short tandem repeats number of times, meet default short
The mode of each short EOS position of sequence signature is same or similar with the first thick synchronization module 22, herein
No longer describe in detail.
The second thick synchronization module 23 is based on each short EOS position, enters with the emitter 1
The thick synchronous mode of row is also same or similar with the first thick synchronization module 22, will not be described in detail herein.
The thin synchronization module 24 is used to, based on resulting short EOS position, determine the leading letter
Sequence long in number, and the sequence long that will be received carries out cross-correlation with default sequence long；And based on resulting
Cross-correlation peak value further to carry out signal with the emitter 1 synchronous.
Specifically, the thin synchronization module 24 is using the next frame of last short EOS position as institute
The original position of sequence long is stated, and the sequence long that will be received carries out computing cross-correlation with default sequence long.
Preferably, also included by the cyclic prefix CP of sequence long between short sequence and sequence long in the targeting signal,
Then the thin synchronization module 24 carries out CP and operates according to default CP length to the targeting signal, then
The baseband signal that will be gone after CP as sequence long in the targeting signal original position, and by its with it is default
Sequence long carry out computing cross-correlation, and obtain the envelope waveform that cross-correlation peak value is constituted.
Then, whether the envelope waveform of the cross-correlation peak value obtained by the thin synchronization module 24 judges is more than
Meet default envelope waveform feature；If, it is determined that the baseband signal corresponding to the peak-peak is institute
The end position of sequence long is stated, and is further adjusted and emitter 1 according to resulting EOS position long
Signal synchronization；If it is not, then slide the baseband signal, and using the baseband signal after slip as sequence long
Original position, repeat the sequence long that will be received carry out cross-correlation with default sequence long.
Preferably, it is described thin same when cross-correlation peak value determined by the thin synchronization module 24 is for multiple
Step module 24 therefrom selects EOS position long, and carry out with this position according to default screening rule
Signal with emitter 1 is synchronous.For example, the thin synchronization module 24 is arranged multiple cross-correlation peak values
Sequence, chooses the end position that the maximum position of cross-correlation peak value is the sequence long.The thin synchronization module 24
EOS position long carries out signal synchronization based on determined by again.
If including multiple sequences long in the targeting signal, the thin synchronization module 24 can also be according to multiple
The length between EOS position each long corresponding to the cross-correlation peak value of sequence long, determines that last is grown
EOS position, and based on identified end position adjustment phase lock circuitry, frequency divider etc., with realize with
The signal synchronization of emitter 1.
Here, when the receiver module 21 fails to obtain the signal of satellite, the base of thin synchronization module 24
In the EOS position long, carried out with the emitter 1 thin synchronous.Specifically, the thin synchronous mould
The short EOS position based on determined by of block 24, the clock signal that adjustment crystal oscillator is exported.For example,
The thin synchronization module 24 is according to identified last EOS position long, and delay/advance inside is brilliant
The phase of exported clock signal of shaking.
In sum, the emitter in the present invention generates short sequence only in accordance with bandwidth, and according to bandwidth and base station
Numbering generation sequence long, can obtain the signal with preferable autocorrelation, be easy to receiver to be identified；
The multiple short sequence for repeating and a sequence long are sent to receiver, receiver by emitter as targeting signal
Using auto-correlation computation, and according to the short sequence location of identification is repeated, quickly can be carried out slightly with emitter
It is synchronous, recycle the complicated computing cross-correlation of computing further to be carried out with emitter on the basis of thick synchronization
Signal synchronization, improves the synchronizing speed between transmitter and receiver；In addition, receiver is according to whether energy
Receive satellite-signal to select the different methods of synchronization, be conducive to the reception to satellite-signal can be received
For machine, synchronous operand is reduced, while for the receiver that can not receive satellite-signal, accurately
The short sequence location of search, reduce synchronism deviation, for follow-up signal treatment accurate synchronised clock is provided；Also
Have, using ZC sequences, using the teaching of the invention it is possible to provide the Autocorrelation envelop waveform for becoming apparent, be easy to receiver to recognize short
Sequence location；Especially for the receiver that can not receive satellite-signal, when thick synchronous, crystal oscillator is adjusted,
In the case of can solve the problem that clock signal deviations are larger, the problem that follow-up adjustment circuit cannot be synchronous.So, this
Invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.
Any person skilled in the art can all enter under without prejudice to spirit and scope of the invention to above-described embodiment
Row modifications and changes.Therefore, such as those of ordinary skill in the art without departing from institute of the present invention
All equivalent modifications completed under the spirit and technological thought of announcement or change, should be by right of the invention
It is required that being covered.
Claims (16)
1. a kind of signal synchronizing method, for emitter, it is characterised in that including：
According to the bandwidth of the targeting signal to be sent, short sequence and sequence long are generated；
Targeting signal successively comprising sequence long described in multiple described short sequences and at least one for repeating is adjusted
Communication channel is made, and is sent.
2. signal synchronizing method according to claim 1, it is characterised in that described according to being sent out
The channel width of the targeting signal for sending, the mode for generating short sequence includes：
N will be inserted in a default ZC sequences under frequency domainP0-LenshortZCIndividual 0, and time domain sequences are converted into,
Obtain the short sequence；Wherein, Np0It is the length of the short sequence, LenshartZCIt is related to the bandwidth
Value.
3. signal synchronizing method according to claim 1, it is characterised in that described according to being sent out
The channel width of the targeting signal for sending, the mode for generating sequence long includes：
N will be inserted in default 2nd ZC sequences under frequency domainp1-LenshortZCIndividual 0, time domain sequences are converted into,
And the identification information for corresponding to receiver is added in the time domain sequences, obtain the sequence long；Wherein, Np1
It is the length of the sequence long, LenshartZCIt is the value related to the bandwidth.
4. a kind of signal synchronizing method, for receiver, it is characterised in that including：
Detect whether to obtain the signal of communications satellite, and receiver/transmitter send comprising targeting signal
Baseband signal；
If so, by preset search window in the baseband signal that will then be received, search meets default short sequence weight
Again each short EOS position counting, meeting default short sequence signature, and based on each short sequence knot
Beam position, is carried out thick synchronous with the emitter；
If it is not, then sliding default search window in Preset Transfer duration, travel through and connect in the transmission duration
The baseband signal of receipts, search meet default short tandem repeats number of times, meet default short sequence signature it is each short
EOS position, and based on each short EOS position, carried out with the emitter thick synchronous；
Based on resulting short EOS position, sequence long in the targeting signal is determined, and will be received
Sequence long carry out cross-correlation with default sequence long；
Signal is further carried out with the emitter based on resulting cross-correlation peak value synchronous.
5. signal synchronizing method according to claim 4, it is characterised in that had not been able to when detecting
It is described to include with the thin synchronous step of the emitter when obtaining the signal of communications satellite：
Based on the identified EOS position long, the clock signal that adjustment crystal oscillator is exported.
6. signal synchronizing method according to claim 4, it is characterised in that described in Preset Transfer
Default search window is slided in duration, the baseband signal received in the transmission duration is traveled through, search meets
The mode of each short EOS position presetting short tandem repeats number of times, meeting default short sequence signature includes：
Preset search window is slided in Preset Transfer duration, search meets the multiple short sequence of default short sequence signature
Row end position；
According to default screening conditions, filtered out from the multiple short EOS position searched default short
The short EOS position of sequence repetition number.
7. the signal synchronizing method according to claim 4 or 6, it is characterised in that the search symbol
The mode bag of each short EOS position closing default short tandem repeats number of times, meeting default short sequence signature
Include：
Auto-correlation processing is carried out to two baseband signals in the slipped over search window, and obtains the auto-correlation
Peak envelope waveform corresponding to result；
Selection meets the short EOS position corresponding to the peak envelope waveform of the short sequence signature.
8. a kind of signal synchronizing method, in the system constituted for transmitter and receiver, its feature exists
In, including：
The emitter sends targeting signal according to the method as described in any in claim 1-3；
The receiver receives the targeting signal that the emitter is launched, and according in such as claim 4-7
Any described method carries out signal synchronization.
9. a kind of emitter, it is characterised in that including：
Generation module, for the bandwidth according to the targeting signal to be sent, generates short sequence and sequence long；
Transmitter module, for by successively comprising sequence long described in multiple described short sequences and at least one for repeating
Targeting signal modulation to communication channel, and sent.
10. emitter according to claim 9, it is characterised in that the generation module is used for will frequency
N is inserted in a default ZC sequences under domainP0-LenshortZCIndividual 0, and time domain sequences are converted into, obtain institute
State short sequence；Wherein, Np0It is the length of the short sequence, LenshartZCIt is the value related to the bandwidth.
11. emitters according to claim 9, it is characterised in that the generation module is used for will frequency
N is inserted in default 2nd ZC sequences under domainp1-LenshortZCIndividual 0, time domain sequences are converted into, and in institute
The identification information of addition correspondence receiver in time domain sequences is stated, the sequence long is obtained；Wherein, Np1For institute
State the length of sequence long, LenshartZCIt is the value related to the bandwidth.
A kind of 12. receivers, it is characterised in that including：
Receiver module, for detecting whether the signal of communications satellite can be obtained, and receiver/transmitter transmission
Baseband signal comprising targeting signal；If so, then performing the first thick synchronization module；If it is not, then performing second
Thick synchronization module；
The first thick synchronization module is used in the baseband signal that will be received by preset search window, search symbol
Each short EOS position closing default short tandem repeats number of times, meeting default short sequence signature, and be based on
Each short EOS position, is carried out thick synchronous with the emitter；
The second thick synchronization module is used to slide default search window in Preset Transfer duration, and traversal is described
The baseband signal that is received in transmission duration, search meet default short tandem repeats number of times, meet default short
Each short EOS position of sequence signature, and based on each short EOS position, with the emitter
Carry out thick synchronization；
Thin synchronization module, for based on resulting short EOS position, determining to be grown in the targeting signal
Sequence, and the sequence long that will be received carries out cross-correlation with default sequence long；Based on resulting cross-correlation
It is synchronous that peak value further carries out signal with the emitter.
13. receivers according to claim 12, it is characterised in that when described detecting has not been able to
When obtaining the signal of communications satellite, the thin synchronization module is additionally operable to the EOS long based on determined by
Position, the clock signal that adjustment crystal oscillator is exported.
14. receivers according to claim 12, it is characterised in that the second thick synchronization module
It is additionally operable to：Preset search window is slided in Preset Transfer duration, search meets the multiple of default short sequence signature
Short EOS position；According to default screening conditions, sieved from the multiple short EOS position searched
Select the short EOS position of default short tandem repeats number of times.
15. receiver according to claim 12 or 14, it is characterised in that described first is thick synchronous
Module and the second thick synchronization module are used to carry out auto-correlation to two baseband signals in the slipped over search window
Treatment, and obtain the peak envelope waveform corresponding to the autocorrelation result；It is special that selection meets the short sequence
Short EOS position corresponding to the peak envelope waveform levied.
A kind of 16. signal synchronizing systems, it is characterised in that including：
Emitter as described in any in claim 9-11；
And, the receiver as described in any in claim 12-15.
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Cited By (4)
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| CN111181885A (en) * | 2018-11-13 | 2020-05-19 | 中国科学院上海高等研究院 | Method for sending and receiving preamble signal in ultra-high speed mobile broadband communication |
| CN112265470A (en) * | 2020-09-22 | 2021-01-26 | 南京创源动力科技有限公司 | Battery management system and management method thereof |
| CN112804043A (en) * | 2021-04-12 | 2021-05-14 | 广州迈聆信息科技有限公司 | Clock asynchronism detection method, device and equipment |
| CN113543298A (en) * | 2021-06-07 | 2021-10-22 | 中国联合网络通信集团有限公司 | Timing synchronization method and base station |
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| US20060078040A1 (en) * | 2004-10-12 | 2006-04-13 | Samsung Electronics Co., Ltd. | Apparatus and method for cell acquisition and downlink synchronization acquisition in a wireless communication system |
| CN101080909A (en) * | 2005-10-31 | 2007-11-28 | 株式会社东芝 | Wireless transmitter, signal to subcarrier allocation method for synchronizing symbol, and wireless receiver |
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| US20060078040A1 (en) * | 2004-10-12 | 2006-04-13 | Samsung Electronics Co., Ltd. | Apparatus and method for cell acquisition and downlink synchronization acquisition in a wireless communication system |
| CN101080909A (en) * | 2005-10-31 | 2007-11-28 | 株式会社东芝 | Wireless transmitter, signal to subcarrier allocation method for synchronizing symbol, and wireless receiver |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111181885A (en) * | 2018-11-13 | 2020-05-19 | 中国科学院上海高等研究院 | Method for sending and receiving preamble signal in ultra-high speed mobile broadband communication |
| CN111181885B (en) * | 2018-11-13 | 2022-09-09 | 中国科学院上海高等研究院 | Method for transmitting and receiving preamble signal in ultra-high speed mobile broadband communication |
| CN112265470A (en) * | 2020-09-22 | 2021-01-26 | 南京创源动力科技有限公司 | Battery management system and management method thereof |
| CN112804043A (en) * | 2021-04-12 | 2021-05-14 | 广州迈聆信息科技有限公司 | Clock asynchronism detection method, device and equipment |
| CN112804043B (en) * | 2021-04-12 | 2021-07-09 | 广州迈聆信息科技有限公司 | Clock asynchronism detection method, device and equipment |
| CN113543298A (en) * | 2021-06-07 | 2021-10-22 | 中国联合网络通信集团有限公司 | Timing synchronization method and base station |
| CN113543298B (en) * | 2021-06-07 | 2022-09-02 | 中国联合网络通信集团有限公司 | Timing synchronization method and base station |
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