CN104093168B - A kind of LTE homogeneous-frequency adjacent-domains detection method and device - Google Patents
A kind of LTE homogeneous-frequency adjacent-domains detection method and device Download PDFInfo
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Abstract
A kind of LTE homogeneous-frequency adjacent-domains detection method and device, including coherent detection is done to the time-domain signal and local master sync signal that receive first, obtain 5ms timing positions；For 5ms timing positions, corresponding frequency domain auxiliary synchronous signals are obtained；Auxiliary synchronous signals are searched for, and the auxiliary synchronous signals being from a locally generated using the auxiliary synchronous signals of acquisition do correlation, are determined the most strong cell of power according to the first related peak value, are reconstructed the auxiliary synchronous signals of the cell and eliminate interference, detect successively until iteration is finished；PBCH decoding verifications are carried out to the cell detected, the cell ID verified by PBCH is fed back into auxiliary synchronous signals search.The co-frequency cell detection technique scheme provided using the present invention can improve search performance, prevent false and missing inspection.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of method detected in LTE system homogeneous-frequency adjacent-domain ID
And device.
Background technology
In long evolving system (Long Term Evolution, abbreviation LTE) system, after starting up of terminal, open first
Initial ranging serving cell is moved to be resident.After mobile terminal successfully resides in some serving cell, adjacent area can be carried out
Search.LTE uses identical networking mostly, in the search to homogeneous-frequency adjacent-domain, can there is certain difference power between general cell,
The cell for causing the strong cell of power on the weak side to power is interfered, and influences the searching accuracy in small and weak area.Using existing same
The method of frequency adjacent area search, can only search the strong cell of power and the weak cell of Partial Power, and there is mould 6 between cell
Disturbed with mould 3, cause the presence of certain false and missing inspection.
The content of the invention
It is an object of the invention to provide a kind of LTE homogeneous-frequency adjacent-domains detection method and device, solve in the prior art with frequency
The problem of adjacent area detection false and missing inspection.
The technical scheme is that a kind of LTE homogeneous-frequency adjacent-domains detection method, comprises the following steps：
Step 1, time-domain sampling signal is received, 5ms timing informations are obtained；
Step 2, auxiliary synchronous signals are determined according to the position relationship of step 1 gained 5ms timing informations and primary and secondary synchronization signals
Time-domain position, the auxiliary synchronous signals RxSSSInFd of frequency domain is obtained by Fourier transformation；
Step 3, auxiliary synchronous signals search is carried out, alternative cell ID set A and frame header position is obtained；
Step 4, the cell ID made a false report in alternative cell ID set A is fallen by PBCH checksum filters, after being verified
Set of cell IDs B, the PBCH are Physical Broadcast Channel；
Step 5, compare small obtained by current iteration execution step 4 gained set of cell IDs B and last iteration execution step 4
Area ID set B, return to step 3 simultaneously adjusts auxiliary synchronous signals search according to comparative result.
Moreover, when performing step 3, carrying out auxiliary synchronous signals search, to include basic search step as follows,
Step 3.1, iterations upper limit iter1 is set, and it is 1 to make current iteration number of times r；
Step 3.2,504 × 2 corresponding frequency domain auxiliary synchronous signals LocalSSSInFd are generated；
Step 3.3, auxiliary synchronous signals related operation is carried out, power is determined according to the search of gained auxiliary synchronous signals correlation peak
Most strong cell ID, obtains frame header position, reconstructed frequency domain auxiliary synchronous signals, and cell ID is stored in into alternative cell ID set A,
Search determines that respective formula is as follows according to the first peak of related operation,
Wherein, id represents that the cell ID, RxSSSInFd (i) that are searched out according to auxiliary synchronous signals correlation peak represent reception
Frequency domain auxiliary synchronous signals, LoaclSSSInFd (i, c, s) represents that the corresponding frequency domain of c-th of cell of s fields of generation is auxiliary same
Walk signal；Signaling point sequence number i value is 0≤i≤61, and cell sequence number c value is 0≤c≤503；S={ 0,1 } is identified, point
Not Biao Shi subframe 0 and subframe 5 half frame number；
Step 3.4, step 3.3 is reconstructed into auxiliary synchronous signals of the gained frequency domain auxiliary synchronous signals from step 2 gained frequency domain
Subtracted in RxSSSInFd, obtain the frequency domain auxiliary synchronous signals RxSSSInFd ' after interference is eliminated；
Step 3.5, current iteration number of times r=r+1 is made, whether r is then judged more than iter1, if otherwise return to step 3.4
Redefine peak value and eliminate interference, until current iteration number of times exceedes the iterations upper limit iter1 set, then iteration knot
Beam, the final alternative cell ID set A of output and frame header position.
Moreover, in step 5, comparing current iteration and performing step 4 gained set of cell IDs B and last iteration execution step
After 4 gained set of cell IDs B,
If comparative result is to have the cell ID newly increased, step 3 is back to, and when next iteration performs step 3,
The most strong cell ID of power that first n times execution step 3.3 is searched out is set to by force current iteration and performs step 4 gained set of cell IDs
B；
If the cell ID for comparing not newly increase, step 3 is back to, and when next iteration performs step 3, will
The most strong cell ID of power that preceding n execution step 3.3 is searched out is set to by force current iteration and performs step 4 gained set of cell IDs B,
When performing step 3.3 the (n+1)th~the i-th ter1 times determined according to the first peak of related operation, but will be all
Peak value is arranged from big to small, is determined according to the offset peak after the first peak value.
Moreover, in step 4, the cell ID made a false report in alternative cell ID set A is fallen by PBCH checksum filters including following
Step, step 4.1, takes out a cell ID as currently processed cell ID, according to frame header position from alternative cell ID set A
The PBCH signals of continuous 4 frame are obtained, PBCH verifications are carried out, enter step 4.2 if if verification, if verification does not pass through, directly
Into step 4.3；
Step 4.2, currently processed cell ID is stored in set of cell IDs B, reconstructs the corresponding PBCH of currently processed cell ID
Signal, and reconstruction result is subtracted from original PBCH signals, carry out interference elimination；
Step 4.3, return to step 4.1, take out next cell ID as currently processed small from alternative cell ID set A
Area ID, is carried out after PBCH verifications and interference elimination, all cell ID are disposed in alternative cell ID set A, obtain
The set of cells B verified by PBCH.
The present invention correspondingly provides a kind of LTE homogeneous-frequency adjacent-domains detection means, including with lower module：
Master sync signal position acquisition module, for receiving time-domain sampling signal, obtains 5ms timing informations；
Auxiliary synchronous signals acquisition module, for 5ms timing informations and master according to obtained by master sync signal position acquisition module
The position relationship of auxiliary synchronous signals determines the time-domain position of auxiliary synchronous signals, and the auxiliary synchronous letter of frequency domain is obtained by Fourier transformation
Number RxSSSInFd；SSS search modules, for carrying out auxiliary synchronous signals search, obtain alternative cell ID set A and frame header position；
Correction verification module, for falling the cell ID made a false report in alternative cell ID set A by PBCH checksum filters, is verified
Set of cell IDs B, the PBCH afterwards is Physical Broadcast Channel；
Compare adjusting module, verification gained set of cell IDs B and last time are performed for twin check module current iteration
Iteration performs verification gained set of cell IDs B, and carries out auxiliary synchronization next time according to the adjustment of comparative result order SSS search modules
Signal search.
Moreover, SSS search modules carry out auxiliary synchronous signals search, to include basic search step as follows,
Step 3.1, iterations upper limit iter1 is set, and it is 1 to make current iteration number of times r；
Step 3.2,504 × 2 corresponding frequency domain auxiliary synchronous signals LocalSSSInFd are generated；
Step 3.3, auxiliary synchronous signals related operation is carried out, power is determined according to the search of gained auxiliary synchronous signals correlation peak
Most strong cell ID, obtains frame header position, reconstructed frequency domain auxiliary synchronous signals, and cell ID is stored in into alternative cell ID set A,
Search determines that respective formula is as follows according to the first peak of related operation,
Wherein, id represents that the cell ID, RxSSSInFd (i) that are searched out according to auxiliary synchronous signals correlation peak represent reception
Frequency domain auxiliary synchronous signals, LoaclSSSInFd (i, c, s) represents that the corresponding frequency domain of c-th of cell of s fields of generation is auxiliary same
Walk signal；Signaling point sequence number i value is 0≤i≤61, and cell sequence number c value is 0≤c≤503；S={ 0,1 } is identified, point
Not Biao Shi subframe 0 and subframe 5 half frame number；
Step 3.4, step 3.3 is reconstructed into frequency domain obtained by gained frequency domain auxiliary synchronous signals from auxiliary synchronous signals acquisition module
Subtracted in auxiliary synchronous signals RxSSSInFd, obtain the frequency domain auxiliary synchronous signals RxSSSInFd ' after interference is eliminated；
Step 3.5, current iteration number of times r=r+1 is made, whether r is then judged more than iter1, if otherwise return to step 3.4
Redefine peak value and eliminate interference, until current iteration number of times exceedes the iterations upper limit iter1 set, then iteration knot
Beam, the final alternative cell ID set A of output and frame header position.
Moreover, comparing adjusting module twin check module current iteration performs verification gained set of cell IDs B and last time
Iteration is performed after verification gained set of cell IDs B,
If comparative result is to have the cell ID newly increased, order SSS search modules perform auxiliary synchronization in next iteration
During signal search, the most strong cell ID of power that first n times execution step 3.3 is searched out is set to by force correction verification module current iteration and performed
Verification gained set of cell IDs B；
If the cell ID for comparing not newly increase, order SSS search modules perform auxiliary synchronous letter in next iteration
During number search, the first n time most strong cell ID of power that searches out of execution step 3.3 is set to by force correction verification module current iteration execution school
Gained set of cell IDs B is tested, is not the first peak value position according to related operation when performing step 3.3 the (n+1)th~the i-th ter1 times
Determination is put, but all peak values are arranged from big to small, is determined according to the offset peak after the first peak value.
Moreover, correction verification module falls the cell ID made a false report in alternative cell ID set A by PBCH checksum filters including following
Step, step 4.1, takes out a cell ID as currently processed cell ID, according to frame header position from alternative cell ID set A
The PBCH signals of continuous 4 frame are obtained, PBCH verifications are carried out, enter step 4.2 if if verification, if verification does not pass through, directly
Into step 4.3；
Step 4.2, currently processed cell ID is stored in set of cell IDs B, reconstructs the corresponding PBCH of currently processed cell ID
Signal, and reconstruction result is subtracted from original PBCH signals, carry out interference elimination；
Step 4.3, return to step 4.1, take out next cell ID as currently processed small from alternative cell ID set A
Area ID, is carried out after PBCH verifications and interference elimination, all cell ID are disposed in alternative cell ID set A, obtain
The set of cells B verified by PBCH.
The present invention first obtains 5ms timing, and then obtain the auxiliary synchronous letter of frequency domain after time-domain sampling signal is received
Number.It is related to local continuous two field auxiliary synchronous signals according to original reception frequency domain auxiliary synchronous signals, pass through correlation peak
Detection obtains frame originating point information, and obtains by iterative interference cancellation alternative set of cell IDs A；Secondly by PBCH signals
False in CRC filtering alternative cell ID, obtains the set of cell IDs B verified by PBCH, finally by feedback
Detection, alternative cell ID set A scope is updated by adjusting SSS search, and the cell ID that there will be progressively is detected, carried
Cell ID detection performances under high same frequency, reduction false and false dismissal probability.
Brief description of the drawings
Fig. 1 is the flow chart of the embodiment of the present invention；
Fig. 2 is the flow chart that SSS of the embodiment of the present invention searches for alternative cell ID set A.
Embodiment
In multiple embodiments of the following present invention, one embodiment provides a kind of LTE homogeneous-frequency adjacent-domains detection method, one
Individual embodiment provides a kind of LTE homogeneous-frequency adjacent-domains detection means.The technology of the present invention is described in detail below in conjunction with drawings and examples
Scheme.
The technical scheme in the embodiment of the present invention is more fully understood in order to those skilled in the art, and is made of the invention real
Applying the above-mentioned purpose of example, feature and advantage can be more obvious and understandable, below in conjunction with the accompanying drawings to technology in the embodiment of the present invention
Scheme makees further more detailed explanation.
It is a kind of embodiment flow chart of LTE homogeneous-frequency adjacent-domains detection method of the application referring to Fig. 1, detailed step is as follows：
Step 1：Time-domain sampling signal is received, 5ms timing informations are obtained.Embodiment generates local master sync signal, adopts
With coherent detection is slided, corresponding main sync bit at related peak-peak is obtained, 5ms timing informations are obtained.
Step 2：Obtain the auxiliary synchronous signals of frequency domain.According to step 1 gained 5ms timing informations (i.e. master sync signal when
Domain position) and the position relationship of primary and secondary synchronization signals can determine the time-domain position of auxiliary synchronous signals, obtained by Fourier transformation
To the auxiliary synchronous signals RxSSSInFd of frequency domain, that is, obtain frequency domain SSS, SSS abbreviations auxiliary synchronous signals commonly used in the art.
Embodiment is according to the fixed bit between the corresponding primary and secondary synchronization signals of TDD/FDD patterns (time division duplex/FDD)
Put and one is differed between master sync signal and auxiliary synchronous signals under the position of Relation acquisition auxiliary synchronous signals, FDD-LTE patterns
OFDM (Orthogonal Frequency Division Multiplexing, OFDM) symbol, TDD-LTE patterns
Lower master sync signal differs three OFDM symbols with auxiliary synchronous signals.
According to LTE protocol, synchronizing signal is mapped in the middle of frequency band on 1.25MHz.Time domain auxiliary synchronous signals pass through Fourier
Frequency domain is transformed to, the information for extracting 1.25M bandwidth in the middle of bandwidth can obtain the auxiliary synchronous signals of frequency domain.
Step 3：SSS is searched for, and obtains alternative cell ID set and frame header position.
SSS search is to carry out interference elimination detection to obtain alternative set of cell IDs A and frame head for auxiliary synchronous signals
Position.Carried out related calculation using 504 × 2 groups of auxiliary synchronous signals that frequency domain auxiliary synchronous signals are from a locally generated are obtained, according to correlation
The first peak value judge the strong cell ID of power and obtain current demand signal to be in subframe 0 or subframe 5, in conjunction with 5ms timings
Information acquisition frame header position；The auxiliary synchronous signals that channel estimation reconstructs its frequency domain are done to strong cell ID, then received from original
Frequency domain auxiliary synchronous signals in subtract, to eliminate interference of the strong cell to small and weak area, successively iteration obtain SSS search it is alternative small
Area ID set A.
Referring to Fig. 2, embodiment carries out the iteration elimination search of frequency domain auxiliary synchronous signals, and basic process is as follows,
1) iterations upper limit iter1 is set, and it is 1 to make current iteration number of times r；
2) 504 × 2 corresponding frequency domain auxiliary synchronous signals LocalSSSInFd are locally generated；
3) SSS related operations are carried out, the most strong cell ID of power are searched out according to gained auxiliary synchronous signals correlation peak, accordingly
Formula is as follows,
Wherein, id represents the cell ID searched out according to auxiliary synchronous signals correlation peak, is represented for deposit set A .*
Dot product.LTE protocol provides that the auxiliary synchronous signals length of frequency domain is 62, and signaling point sequence number i value is 0≤i≤61；
RxSSSInFd (i) represents the frequency domain auxiliary synchronous signals received, and LoaclSSSInFd (i, c, s) represents the s half locally generated
Frame, the corresponding frequency domain auxiliary synchronous signals of c-th of cell；LTE protocol regulation has 504 cells, and cell sequence number c value is 0≤c
≤503；S={ 0,1 } is identified, half frame number of subframe 0 and subframe 5 is represented respectively.
There are 504 × 2 values after correlation computations, it is corresponding with each ID and half frame number, just can be really according to maximum peak value
Determine cell ID and half frame number, this id is stored in alternative cell ID set A.Work(is determined according to the first peak of related operation
After the most strong cell ID of rate and half frame number, and then frame header position can be obtained, then reconstructed frequency domain auxiliary synchronous signals, are reconstructed during specific implementation
Prior art can be used by realizing, it will not go into details by the present invention.
4) by cell ID frequency domains (i.e. 3) the reconstruct gained frequency domain auxiliary synchronous signals after reconstruct) from primary signal (i.e. step 2
The auxiliary synchronous signals RxSSSInFd of gained frequency domain) in subtract, obtain interference eliminate after frequency domain auxiliary synchronous signals
RxSSSInFd′；
5) make current iteration number of times r=r+1, whether judge r more than iter1, if otherwise returning 2), repeat 2)~4) again
Determine peak value and eliminate interference, until current iteration number of times exceedes the iterations upper limit iter1 set, iteration terminates, and exports
Final alternative cell ID set A and frame header position.
When performing step 3 for the first time, the most strong cell ID of power is obtained according to above basic procedure, during subsequent execution step 3,
It is adjusted according to the comparative result of step 5.
Step 4：PBCH is verified, and the false cell ID that auxiliary synchronous signals are detected is fallen by PBCH checksum filters.Including basis
Frame header position obtains the PBCH signals of continuous 4 frame, filters out false by the reliability for merging decoding verification alternative cell ID, obtains
Set of cell IDs B after verification；PBCH is Physical Broadcast Channel.
Embodiment obtains the set of cell IDs B verified by PBCH：According to frame header position acquisition of information to continuous 4 frame
PBCH signals, blind Detecting is carried out to the cell ID in alternative cell ID set A, is merged by the PBCH of continuous 4 frame and is received decoding
Whether be make a false report and filtered out, can be realized and judged according to existing calibration technology if judging each cell ID in set A one by one.
When it is implemented, below scheme can be used：
1) a cell ID is taken out from alternative cell ID set A as currently processed cell ID, is obtained according to frame header position
The PBCH signals of continuous 4 frame are taken, PBCH verifications are carried out, if verification passes through, into 2), if verification does not pass through, are directly entered 3)；
2) currently processed cell ID is stored in set B, the corresponding PBCH signals of the currently processed cell ID of reconstruct, and from original
PBCH signals on subtract reconstruction result, other cells ID PBCH is caused to do with the PBCH for eliminating currently processed cell ID
Disturb；
3) return 1), taken out from alternative cell ID set A next cell ID as currently processed cell ID progress at
Reason, after the completion of the verification and interference elimination that carry out PBCH successively to cell ID all in alternative cell ID set A, is passed through
The set of cells B of PBCH verifications.
Step 5：Feedback detection, compares current iteration execution step 4 gained set of cell IDs B and last iteration performs step
Rapid 4 gained set of cell IDs B, return to step 3 simultaneously adjusts SSS search according to comparative result.
Embodiment is adjusted according to the content for the set of cells B that PBCH verifications are passed twice through before and after comparison, feedback detection
There are two kinds of adjustment modes：
Find there is new if comparing this and performing preceding once perform in set B obtained by step 4 relatively of set B obtained by step 4
Increased cell ID, then this set B is delivered in SSS search, that is, step 3 is back to, in SSS search procedures next time
In, preceding n peak value is judged that gained cell ID is set to by force the cell ID in this set B, wherein n is small in this set B
Area's ID numbers, are eliminated with the interference for ensureing accurate auxiliary synchronous signals.I.e. in step 3 is performed next time, alternative cell
Cell ID in the most strong cell ID of power that 3) n execution search out before in ID set A, set B obtained by this execution step 4
Replace, before elimination after n cell ID interference, remaining cell ID followed by according to the first peak value judgement obtain not
Become.
If finding the cell ID not newly increased before and after relatively in set B twice, then this set B is delivered into SSS
In search, that is, step 3 is back to, in SSS search procedures next time, preceding n peak value is judged that gained cell ID is set to by force this
Cell ID in secondary set B, wherein n are the cell ID numbers in this set B, to ensure accurate auxiliary synchronous signals
Interference is eliminated.Before elimination after n cell ID interference, remaining cell ID sentences according to the first peak value plus skew offset
Fixed, the accumulative frequency that wherein offset is the newly-increased cell ID of the front and rear B of set twice (resets weight when having newly-increased cell ID
Meter), until obtaining alternative cell ID set A.Thus prevent because auxiliary synchronous signals cross correlation can caused missing inspection.It is remaining
Cell ID judges that implementation is as follows according to the first peak value plus skew offset,
Performed in step 3 is performed next time, in alternative cell ID set A at the (n+1)th~the i-th ter1 times and 3) search for power
During most strong cell ID, the corresponding correlation peak of 504 cells is sorted from big to small respectively, if k-th of peak value is designated as after sequence
Pos (k), k scope are [0,503], and the first peak value is pos (0), will determine that the most strong cell ID of power is changed to according to pos (0)
The most strong cell ID of power is determined according to pos (0+offset).
Embodiment with a kind of LTE homogeneous-frequency adjacent-domains detection method of the invention is corresponding, and present invention also offers a kind of LTE is same
The embodiment of frequency adjacent area detection means.
The LTE homogeneous-frequency adjacent-domains detection means is included with lower module：
Master sync signal position acquisition module, for receiving time-domain sampling signal, obtains 5ms timing informations；
Auxiliary synchronous signals acquisition module, for 5ms timing informations and master according to obtained by master sync signal position acquisition module
The position relationship of auxiliary synchronous signals determines the time-domain position of auxiliary synchronous signals, and the auxiliary synchronous letter of frequency domain is obtained by Fourier transformation
Number RxSSSInFd；SSS search modules, for carrying out auxiliary synchronous signals search, obtain alternative cell ID set A and frame header position；
Correction verification module, for falling the cell ID made a false report in alternative cell ID set A by PBCH checksum filters, is verified
Set of cell IDs B, the PBCH afterwards is Physical Broadcast Channel；
Compare adjusting module, verification gained set of cell IDs B and last time are performed for twin check module current iteration
Iteration performs verification gained set of cell IDs B, and carries out auxiliary synchronization next time according to the adjustment of comparative result order SSS search modules
Signal search.
Each module implement it is corresponding to each step, the present invention it will not go into details.
When it is implemented, those skilled in the art can use other Module Division modes, for example, set reconstructed module special
Door is used to reconstruct auxiliary synchronous signals and PBCH signals, still in the scope of the present invention.
The technology that what those skilled in the art can will be apparent that recognize in the embodiment of the present invention can add by software must
The general hardware platform needed is realized.Do not limit to the example for this protection scope of the present invention, but meet claims
Character of innovation maximum magnitude.
Claims (4)
1. a kind of LTE homogeneous-frequency adjacent-domains detection method, it is characterised in that comprise the following steps：
Step 1, time-domain sampling signal is received, 5ms timing informations are obtained；
Step 2, according to the position relationship of step 1 gained 5ms timing informations and primary and secondary synchronization signals determine auxiliary synchronous signals when
Domain position, the auxiliary synchronous signals RxSSSInFd of frequency domain is obtained by Fourier transformation；
Step 3, auxiliary synchronous signals search is carried out, alternative cell ID set A and frame header position is obtained；
Step 4, the cell ID made a false report in alternative cell ID set A, the cell after being verified are fallen by PBCH checksum filters
ID set B, the PBCH are Physical Broadcast Channel；
Step 5, performed when step 4 gained set of cell IDs B and last iteration are performed when comparing current iteration small obtained by step 4
Area ID set B, return to step 3 simultaneously adjusts auxiliary synchronous signals search according to comparative result；
When performing step 3, carrying out auxiliary synchronous signals search, to include basic search step as follows,
Step 3.1, iterations upper limit iter1 is set, and it is 1 to make current iteration number of times r；
Step 3.2,504 × 2 corresponding frequency domain auxiliary synchronous signals LocalSSSInFd are generated；
Step 3.3, auxiliary synchronous signals related operation is carried out, determines that power is most strong according to the search of gained auxiliary synchronous signals correlation peak
Cell ID, obtains frame header position, reconstructed frequency domain auxiliary synchronous signals, and cell ID is stored in into alternative cell ID set A,
Search determines that respective formula is as follows according to the first peak of related operation,
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Wherein, id represents that the cell ID, RxSSSInFd (i) that are searched out according to auxiliary synchronous signals correlation peak represent the frequency received
Domain auxiliary synchronous signals, LocalSSSInFd (i, c, s) represents the auxiliary synchronous letter of the corresponding frequency domain of c-th of cell of s fields of generation
Number；Signaling point sequence number i value is 0≤i≤61, and cell sequence number c value is 0≤c≤503；S={ 0,1 } is identified, respectively table
Show half frame number of subframe 0 and subframe 5；
Step 3.4, step 3.3 is reconstructed into auxiliary synchronous signals of the gained frequency domain auxiliary synchronous signals from step 2 gained frequency domain
Subtracted in RxSSSInFd, obtain the frequency domain auxiliary synchronous signals RxSSSInFd ' after interference is eliminated；
Step 3.5, current iteration number of times r=r+1 is made, whether r is then judged more than iter1, if otherwise return to step 3.4 is again
Determine peak value and eliminate interference, until current iteration number of times exceedes the iterations upper limit iter1 set, then iteration terminates, defeated
Go out final alternative cell ID set A and frame header position；
In step 5, compare current iteration and perform step 4 gained set of cell IDs B and last iteration execution step 4 gained cell
After ID set B,
If comparative result is to have the cell ID newly increased, step 3 is back to, and when next iteration performs step 3, alternatively
The most strong cell ID of power that n execution step 3.3 is searched out before in set of cell IDs A, set B obtained by this execution step 4
In cell ID replace, before elimination after n cell ID interference, remaining cell ID followed by according to the first peak value judgement
What is obtained is constant；Wherein n is the cell ID numbers in this set B；
If the cell ID for comparing not newly increase, step 3 is back to, and when next iteration performs step 3, by preceding n
The most strong cell ID of power that secondary execution step 3.3 is searched out is set to by force current iteration and performs step 4 gained set of cell IDs B,
The (n+1)th~the i-th ter1 times is determined according to the first peak of related operation when performing step 3.3, but by all peaks
Value is arranged from big to small, is determined according to the offset peak after the first peak value, and wherein offset is front and rear to collect twice
Close the accumulative frequency that B does not increase cell ID newly.
2. LTE homogeneous-frequency adjacent-domains detection method according to claim 1, it is characterised in that：In step 4, verified by PBCH
The cell ID made a false report in alternative cell ID set A is filtered to comprise the following steps,
Step 4.1, a cell ID is taken out from alternative cell ID set A as currently processed cell ID, according to frame header position
The PBCH signals of continuous 4 frame are obtained, PBCH verifications are carried out, enter step 4.2 if if verification, if verification does not pass through, directly
Into step 4.3；
Step 4.2, currently processed cell ID is stored in set of cell IDs B, reconstructs the corresponding PBCH signals of currently processed cell ID,
And reconstruction result is subtracted from original PBCH signals, carry out interference elimination；
Step 4.3, return to step 4.1, take out next cell ID as currently processed cell from alternative cell ID set A
ID, is carried out after PBCH verifications and interference elimination, all cell ID are disposed in alternative cell ID set A, are led to
Cross the set of cells B of PBCH verifications.
3. a kind of LTE homogeneous-frequency adjacent-domains detection means, it is characterised in that including with lower module：
Master sync signal position acquisition module, for receiving time-domain sampling signal, obtains 5ms timing informations；
Auxiliary synchronous signals acquisition module, for according to 5ms timing informations obtained by master sync signal position acquisition module and major-minor same
The position relationship of step signal determines the time-domain position of auxiliary synchronous signals, and the auxiliary synchronous signals of frequency domain are obtained by Fourier transformation
RxSSSInFd；
SSS search modules, for carrying out auxiliary synchronous signals search, obtain alternative cell ID set A and frame header position；
Correction verification module, for falling the cell ID made a false report in alternative cell ID set A by PBCH checksum filters, after obtaining verification
Set of cell IDs B, the PBCH is Physical Broadcast Channel；
Compare adjusting module, verification gained set of cell IDs B is performed during for twin check module current iteration and the last time changes
For when perform verification gained set of cell IDs B, and according to comparative result order SSS search modules adjustment carry out auxiliary synchronization next time
Signal search；
SSS search modules carry out auxiliary synchronous signals search, and to include basic search step as follows,
Step 3.1, iterations upper limit iter1 is set, and it is 1 to make current iteration number of times r；
Step 3.2,504 × 2 corresponding frequency domain auxiliary synchronous signals LocalSSSInFd are generated；
Step 3.3, auxiliary synchronous signals related operation is carried out, determines that power is most strong according to the search of gained auxiliary synchronous signals correlation peak
Cell ID, obtains frame header position, reconstructed frequency domain auxiliary synchronous signals, and cell ID is stored in into alternative cell ID set A,
Search determines that respective formula is as follows according to the first peak of related operation,
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Wherein, id represents that the cell ID, RxSSSInFd (i) that are searched out according to auxiliary synchronous signals correlation peak represent the frequency received
Domain auxiliary synchronous signals, LocalSSSInFd (i, c, s) represents the auxiliary synchronous letter of the corresponding frequency domain of c-th of cell of s fields of generation
Number；Signaling point sequence number i value is 0≤i≤61, and cell sequence number c value is 0≤c≤503；S={ 0,1 } is identified, respectively table
Show half frame number of subframe 0 and subframe 5；
Step 3.4, step 3.3 is reconstructed into the auxiliary same of frequency domain obtained by gained frequency domain auxiliary synchronous signals from auxiliary synchronous signals acquisition module
Subtracted in step signal RxSSSInFd, obtain the frequency domain auxiliary synchronous signals RxSSSInFd ' after interference is eliminated；
Step 3.5, current iteration number of times r=r+1 is made, whether r is then judged more than iter1, if otherwise return to step 3.4 is again
Determine peak value and eliminate interference, until current iteration number of times exceedes the iterations upper limit iter1 set, then iteration terminates, defeated
Go out final alternative cell ID set A and frame header position；
Compare adjusting module twin check module current iteration execution verification gained set of cell IDs B and last iteration execution school
Test after gained set of cell IDs B,
If comparative result is to have the cell ID newly increased, order SSS search modules perform auxiliary synchronous signals in next iteration
During search, the most strong cell ID of power that preceding n execution step 3.3 is searched out in alternative cell ID set A, by this execution step
Cell ID replacements in 4 gained set B, before elimination after n cell ID interference, remaining cell ID followed by according to the
It is constant that the judgement of one peak value is obtained；Wherein n is the cell ID numbers in this set B；
If the cell ID for comparing not newly increase, order SSS search modules perform auxiliary synchronous signals in next iteration and searched
Suo Shi, the most strong cell ID of power that first n times execution step 3.3 is searched out is set to by force correction verification module current iteration and performs verification institute
Set of cell IDs B, be not true according to the first peak of related operation in the (n+1)th~the i-th ter1 time execution step 3.3
It is fixed, but all peak values are arranged from big to small, determined according to the offset peak after the first peak value, wherein
Offset is the accumulative frequency that the front and rear B of set twice does not increase cell ID newly.
4. LTE homogeneous-frequency adjacent-domains detection means according to claim 3, it is characterised in that：Correction verification module was verified by PBCH
The cell ID made a false report in alternative cell ID set A is filtered to comprise the following steps,
Step 4.1, a cell ID is taken out from alternative cell ID set A as currently processed cell ID, according to frame header position
The PBCH signals of continuous 4 frame are obtained, PBCH verifications are carried out, enter step 4.2 if if verification, if verification does not pass through, directly
Into step 4.3；
Step 4.2, currently processed cell ID is stored in set of cell IDs B, reconstructs the corresponding PBCH signals of currently processed cell ID,
And reconstruction result is subtracted from original PBCH signals, carry out interference elimination；
Step 4.3, return to step 4.1, take out next cell ID as currently processed cell from alternative cell ID set A
ID, is carried out after PBCH verifications and interference elimination, all cell ID are disposed in alternative cell ID set A, are led to
Cross the set of cells B of PBCH verifications.
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| CN104735004B (en) * | 2015-03-05 | 2018-05-29 | 京信通信系统（中国）有限公司 | A kind of interference elimination method and equipment for cell searching |
| CN104754623B (en) * | 2015-03-05 | 2018-09-14 | 京信通信系统（中国）有限公司 | The small region search method and system eliminated based on LTE system interference |
| US10165536B2 (en) * | 2015-06-19 | 2018-12-25 | Qualcomm Incorporated | System scanning and acquisition |
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| CN111435889B (en) * | 2019-01-11 | 2021-08-31 | 华为技术有限公司 | Method and device for sending synchronization signal |
| CN111294294A (en) * | 2019-05-15 | 2020-06-16 | 展讯通信（上海）有限公司 | Cell search method, user terminal, and computer-readable storage medium |
| CN111131100B (en) * | 2019-12-26 | 2022-11-08 | 江苏科大亨芯半导体技术有限公司 | NBIOT system multi-cell iterative interference cancellation detection method |
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