CN103906103B - Master sync signal detection method and detecting system in LTE system - Google Patents
Master sync signal detection method and detecting system in LTE system Download PDFInfo
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Abstract
The invention provides master sync signal detection method and detecting system in a kind of LTE system, wherein, related power curve | r (τ) |2Pass through pre-add frequency deviation fofstUnder master sync signal to receive signal it is related obtain, thus, it is possible to utilization pre-add frequency deviation fofstCompensation receives the frequency deviation between signal and master sync signal, so as to be easily detected master sync signal, improves the reliability of master sync signal detection.
Description
Technical field
The present invention relates to mobile communication technology field, in more particularly to a kind of LTE system master sync signal detection method and
Detecting system.
Background technology
With continuing to develop for mobile communication and wireless access wide band technology, Long Term Evolution LTE（Long Term
Evolution）Technology is with its high transfer rate, the advantage such as small user plane latency and support terminal high-speed movement, as a new generation
The mainstream technology of Mobile Communication Development.For cell mobile communication systems, cell searching is mobile terminal access wireless network
The first step of network, is one of most basic flow of physical layer.When terminal first powers on access cell and handover, it is necessary to enter
Row cell searching sets up Time and Frequency Synchronization, obtains after numbering and other systems configuration information in the group of physical-layer cell, access cell, eventually
End could receive cell system message, set up connection, carry out communication process.
LTE cell searchings pass through master sync signal（P-SCH）And auxiliary synchronous signals（S-SCH）Detection is realized.Main synchronous letter
Number and auxiliary synchronous signals periodically sent in the fixed position of every radio frames, its particular location refers to Fig. 1.It is main on frequency domain
Synchronizing signal is generated by the Zadoff-Chu sequence in frequency domain, and its value is：
Wherein, u value is numbered in cell ID groupDetermine, physical relationship between the two is as shown in following table one：
Table one
Master sync signal is located at the center section of system bandwidth, and 62 subcarriers, and each the five of its adjacent both sides are occupied altogether
Individual subcarrier retains without its frequency-domain structure is as shown in Figure 2.
No matter in time domain or frequency domain, master sync signal is respectively provided with good auto-correlation and cross correlation, has 3 groups,
For completing Symbol Timing and frequency offset correction, while also carrying the information of numbering in cell ID group.Existing technical scheme
Auto-correlation and cross correlation that master sync signal is good are make use of, to multigroup（Fix 10 groups）Continuous 5ms time-domain signals and
Average, merging is implemented in the position of the relevant peaks of time-domain primary synchronization signal, so that the position of the maximum relevant peaks of possibility is found, from
And determine to number in cell ID group
But, in LTE system, signal can be configured over a plurality of bands, specifically refer to following table two：
Table two
In each frequency band, adjacent channel center frequency point is at intervals of 100kHz, and center frequency point is 100kHz integer
Times.LTE has multiple possible bandwidth, including 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz.To each bandwidth
Configuration, synchronizing signal is all located at the middle 0.96MHz of system bandwidth.Frequency grid causes the possibility in each frequency band for 100kHz
Center frequency point number is a lot, and adaptive-bandwidth to determine that center frequency point is more difficult again.With frequency band 40（2300MHz~2400MHz）For
Example, its possible center frequency point number is about 1000（The influence of frequency band boundary is put aside herein）.The realization side of existing terminal
Method is to obtain one group by the center frequency point list after the sequence of possibility size（At intervals of 100kHz）, then taken successively from list
Go out a center frequency point fi, in fiUpper detection master sync signal.Mainly in fi+ΔfBMaster sync signal is detected at frequency.When |
ΔfB| when larger, the probability that can't detect master sync signal is sharply increased, once in fi+ΔfBOn can't detect main synchronous letter
Number, receiver will skip to next center frequency point fiPlace continues detection, because | fj-fi| >=100kHz, this will lose and detect
The chance of synchronizing signal.In addition, in the prior art, when channel circumstance is more excellent, it is still desirable to which receiving 10 groups of 5ms data could be complete
Into master sync signal detection, Algorithms T-cbmplexity is larger.
The content of the invention
It is an object of the invention to provide master sync signal detection method and detecting system in a kind of LTE system, to solve
In the prior art, when frequency deviation is larger, the problem of will appear from easily can't detect master sync signal.
In order to solve the above technical problems, the present invention provides master sync signal detection method, the LTE in a kind of LTE system
Master sync signal detection method includes in system：
Search terms is configured, every search terms includes synchronous code root u information and pre-add frequency deviation fofstInformation；
The relevant peaks information of search terms is obtained, including：Obtain pre-add frequency deviation fofstUnder master sync signal with receive signal
Related power curve | r (τ) |2；Obtain related power curve | r (τ) |2In before NmaxPower P wr [the i of individual maximum correlation peakopt,
J], and relevant peaks position Pos [iopt, j], wherein ioptRepresent search terms numbering, j ∈ { 0,1 ..., Nmax-1}；
According to the relevant peaks information of the search terms of acquisition, a search terms is chosen, is believed by the synchronous code root u in the search terms
Breath obtains master sync signal.
Optionally, in described LTE system in master sync signal detection method, the relevant peaks letter for enabling search terms is obtained
Breath also includes：Obtain the cumulative power pwr_his [i of relevant peaksopt] [k] and relevant peaks position neighboring extent adj [iopt]
[k], wherein k are recording indexes.
Optionally, in described LTE system in master sync signal detection method, the cumulative power pwr_ of relevant peaks is obtained
his[iopt] [k] and relevant peaks position neighboring extent adj [iopt] [k] include：
In same search terms numbering ioptUnder, there is identical correlation peak location Pos [iopt, j] when, the cumulative power
pwr_his[iopt] [k] according to pwr_his [iopt] [k]=Pwr [iopt,j]+pwr_his[iopt] [k] acquisition；The position phase
Adjacent degree adj [iopt] [k] according to adj [iopt] [k]=adj [iopt] [k] × (1+ α) acquisitions, wherein 0 ＜ α ＜ 1.
Optionally, in described LTE system in master sync signal detection method, the cumulative power pwr_ of relevant peaks is obtained
his[iopt] [k] and relevant peaks position neighboring extent adj [iopt] [k] also include：
In same search terms numbering ioptUnder, there is adjacent correlation peak location Pos [iopt, j] when, the cumulative power
pwr_his[iopt] [k] according to pwr_his [iopt] [k]=2-(Δ1+β)×Pwr[iopt,j]+pwr_his[iopt] [k] acquisition, its
The middle ∈ of Δ 1 { 1,2,3 }, 1 ＜ β ＜ 3；The position neighboring extent adj [iopt] [k] according to adj [iopt] [k]=adj [iopt]
[k]+22-Δ2Obtain, the wherein ∈ of Δ 2 { 1,2 }.
Optionally, in described LTE system in master sync signal detection method, choosing a search terms includes：
Obtain the score value score [i of search termsopt] [k], wherein, score [iopt] [k]=pwr_his [iopt][k]×
adj[iopt][k]；
To the score value score [i of search termsopt] [k] be ranked up, and chooses maximumAnd second largest value
WhenWhen, wherein 1 ＜ λ ＜ 3, choose maximumCorresponding search terms.
Optionally, maximum is worked as in master sync signal detection method in described LTE systemWhen unselected,
By search terms score value score [iopt] [k] and thresholding ΓSCIt is compared, as search terms numbering ioptUnder all score [iopt]
[k] is respectively less than thresholding ΓSCWhen, the search terms is abolished, wherein0.125 ＜ γ ＜ 0.5Represent all search terms score [iopt] [k] average value.
Optionally, in described LTE system in master sync signal detection method, the pre-add frequency deviation fofstValue model
Enclose for { -15kHz, -7.5kHz, 0,7.5kHz, 15kHz }.
Optionally, in described LTE system in master sync signal detection method, the correlation is obtained according to following method
Power curve | r (τ) |2：
The time-domain signal r (n) of reception is divided into M sections, r is obtainedi(m), wherein n=0,1 ..., Ns- 1, i=0,1 ... M-
1；
To ri(m) implement FFT and obtain Ri(k)；
To Ri(k) cyclic shift is carried out to obtainWherein,
Obtain segmentation related power | ri(τ)|2, wherein,
To segmentation related power | ri(τ)|2Spliced, obtain related power curve | r (τ) |2。
The present invention also provides master sync signal in master sync signal detecting system in a kind of LTE system, the LTE system and examined
Examining system includes：
Search terms configuration module, to configure search terms, every search terms includes synchronous code root u information and pre-add frequency deviation
fofstInformation；
Relevant peaks data obtaining module, the relevant peaks information to obtain search terms, including：Obtain pre-add frequency deviation fofstUnder
Master sync signal with receive signal related power curve | r (τ) |2；Obtain related power curve | r (τ) |2In before NmaxIt is individual most
Power P wr [the i of big relevant peaksopt, j], and relevant peaks position Pos [iopt, j], wherein ioptRepresent search terms numbering, j ∈
{0,1,...,Nmax-1}；
Master sync signal determining module, to the relevant peaks information of the search terms according to acquisition, chooses a search terms, by
Synchronous code root u acquisition of information master sync signals in the search terms.
Optionally, in described LTE system in master sync signal detecting system, the relevant peaks data obtaining module is obtained
The relevant peaks information for enabling search terms is taken also to include：Obtain the cumulative power pwr_his [i of relevant peaksopt] [k] and relevant peaks
Position neighboring extent adj [iopt] [k], wherein k is recording indexes.
Optionally, in described LTE system in master sync signal detecting system, the relevant peaks data obtaining module is obtained
Take the cumulative power pwr_his [i of relevant peaksopt] [k] and relevant peaks position neighboring extent adj [iopt] [k] include：
In same search terms numbering ioptUnder, there is identical correlation peak location Pos [iopt, j] when, the cumulative power
pwr_his[iopt] [k] according to pwr_his [iopt] [k]=Pwr [iopt,j]+pwr_his[iopt] [k] acquisition；The position phase
Adjacent degree adj [iopt] [k] according to adj [iopt] [k]=adj [iopt] [k] × (1+ α) acquisitions, wherein 0 ＜ α ＜ 1.
Optionally, in described LTE system in master sync signal detecting system, the relevant peaks data obtaining module is obtained
Take the cumulative power pwr_his [i of relevant peaksopt] [k] and relevant peaks position neighboring extent adj [iopt] [k] also include：
In same search terms numbering ioptUnder, there is adjacent correlation peak location Pos [iopt, j] when, the cumulative power
pwr_his[iopt] [k] according to pwr_his [iopt] [k]=2-(Δ1+β)×Pwr[iopt,j]+pwr_his[iopt] [k] acquisition, its
The middle ∈ of Δ 1 { 1,2,3 }, 1 ＜ β ＜ 3；The position neighboring extent adj [iopt] [k] according to adj [iopt] [k]=adj [iopt]
[k]+22-Δ2Obtain, the wherein ∈ of Δ 2 { 1,2 }.
Optionally, in described LTE system in master sync signal detecting system, the master sync signal determining module choosing
A search terms is taken to include：
Obtain the score value score [i of search termsopt] [k], wherein, score [iopt] [k]=pwr_his [iopt][k]×
adj[iopt][k]；
To the score value score [i of search termsopt] [k] be ranked up, and chooses maximumAnd second largest value
WhenWhen, wherein 1 ＜ λ ＜ 3, choose maximumCorresponding search terms.
Optionally, in described LTE system in master sync signal detecting system, the master sync signal determining module is worked as
MaximumWhen unselected, by search terms score value score [iopt] [k] and thresholding ΓSCIt is compared, when search terms numbering
ioptUnder all score [iopt] [k] be respectively less than thresholding ΓSCWhen, the search terms is abolished, wherein
0.125 ＜ γ ＜ 0.5Represent all search terms score [iopt] [k] average value.
Optionally, in described LTE system in master sync signal detecting system, the pre-add frequency deviation fofstValue model
Enclose for { -15kHz, -7.5kHz, 0,7.5kHz, 15kHz }.
Optionally, in described LTE system in master sync signal detecting system, relevant peaks data obtaining module is according to such as
Lower method obtains the related power curve | r (τ) |2：
The time-domain signal r (n) of reception is divided into M sections, r is obtainedi(m), wherein n=0,1 ..., Ns- 1, i=0,1 ... M-
1；
To ri(m) implement FFT and obtain Ri(k)；
To Ri(k) cyclic shift is carried out to obtainWherein,
Obtain segmentation related power | ri(τ)|2, wherein,
To segmentation related power | ri(τ)|2Spliced, obtain related power curve | r (τ) |2。
In the LTE system that provides of the present invention in master sync signal detection method and detecting system, related power curve | r
(τ)|2Pass through pre-add frequency deviation fofstUnder master sync signal to receive signal it is related obtain, thus, it is possible to utilization pre-add frequency deviation fofst
Compensation receives the frequency deviation between signal and master sync signal, so as to be easily detected master sync signal, improves master sync signal inspection
The reliability of survey.
Brief description of the drawings
Fig. 1 is synchronizing signal position schematic diagram in time domain；
Fig. 2 is the structural representation of master sync signal in a frequency domain；
Fig. 3 be the embodiment of the present invention LTE system in master sync signal detection method schematic flow sheet；
Fig. 4 be the embodiment of the present invention LTE system in master sync signal detecting system module diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments to master sync signal detection method and inspection in LTE system proposed by the present invention
Examining system is described in further detail.According to following explanation and claims, advantages and features of the invention will become apparent from.Need
Illustrate, accompanying drawing is using very simplified form and uses non-accurately ratio, only to conveniently, lucidly auxiliary is said
The purpose of the bright embodiment of the present invention.
Refer to Fig. 3, its for the embodiment of the present invention LTE system in master sync signal detection method schematic flow sheet.
As shown in figure 3, master sync signal detection method includes in the LTE system：
S30：Search terms is configured, every search terms includes synchronous code root u information and pre-add frequency deviation fofstInformation；
S31：The relevant peaks information of search terms is obtained, including：Obtain pre-add frequency deviation fofstUnder master sync signal and reception
The related power curve of signal | r (τ) |2；Obtain related power curve | r (τ) |2In before NmaxThe power P wr of individual maximum correlation peak
[iopt, j], and relevant peaks position Pos [iopt, j], wherein ioptRepresent search terms numbering, j ∈ { 0,1 ..., Nmax-1}；
S32：According to the relevant peaks information of the search terms of acquisition, a search terms, the synchronous code in the search terms are chosen
Root u acquisition of information master sync signals.
Accordingly, the present embodiment also provides master sync signal detecting system in a kind of LTE system, specifically, refer to figure
4, its for the embodiment of the present invention LTE system in master sync signal detecting system module diagram.As shown in figure 4, the LTE
Master sync signal detecting system includes in system：
Search terms configuration module 40, to configure search terms, every search terms includes synchronous code root u information and pre-add frequency deviation
fofstInformation；
Relevant peaks data obtaining module 41, the relevant peaks information to obtain search terms, including：Obtain pre-add frequency deviation fofst
Under master sync signal with receive signal related power curve | r (τ) |2；Obtain related power curve | r (τ) |2In before NmaxIt is individual
Power P wr [the i of maximum correlation peakopt, j], and relevant peaks position Pos [iopt, j], wherein ioptRepresent search terms numbering, j
∈{0,1,...,Nmax-1}；
Master sync signal determining module 42, to the relevant peaks information of the search terms according to acquisition, chooses a search terms,
By the synchronous code root u acquisition of information master sync signals in the search terms.
Wherein synchronous code root u ∈ { 25,29,34 }, i.e., described synchronous code root u in cell ID group with numberingCorrespondence.It is excellent
Choosing, the pre-add frequency deviation fofstSpan be { -15kHz, -7.5kHz, 0,7.5kHz, 15kHz }.Here, according to imitative
True result draws the pre-add frequency deviation fofstPreferred span be { -15kHz, -7.5kHz, 0,7.5kHz, 15kHz }；
In the other embodiment of the present invention, when channel status changes, the pre-add frequency deviation fofstOther frequency values can also be taken.
In the present embodiment, every search terms can also include enabling signal Flag, be marked by the enable signal Flag
It is bright whether to need to perform relevant peaks information acquiring operation to the search terms, so as to easy flow.
In the present embodiment, obtaining the relevant peaks information of enable search terms also includes：Obtain the cumulative power of relevant peaks
pwr_his[iopt] [k] and relevant peaks position neighboring extent adj [iopt] [k], wherein k is recording indexes.Here, the phase
Adjacent degree adj [iopt] [k] according to one or more relevant peaks（Wherein, the data receiver that multiple relevant peaks pass through multiple 5ms
Obtain, this is prior art, and the application is repeated no more to this）Position Pos [iopt, j] between spacing/relation obtain.Wherein,
According to same search terms numbering ioptUnder, the difference of the position relationship between relevant peaks, the cumulative power pwr_his [iopt]
The position neighboring extent adj [i of [k] and relevant peaksopt] [k] can specifically determine by the following method：
In same search terms numbering ioptUnder, there is identical correlation peak location Pos [iopt, j] when, the cumulative power
pwr_his[iopt] [k] according to pwr_his [iopt] [k]=Pwr [iopt,j]+pwr_his[iopt] [k] acquisition；The position phase
Adjacent degree adj [iopt] [k] according to adj [iopt] [k]=adj [iopt] [k] × (1+ α) acquisitions, wherein 0 ＜ α ＜ 1；
In same search terms numbering ioptUnder, there is adjacent correlation peak location Pos [iopt, j] when, the cumulative power
pwr_his[iopt] [k] according to pwr_his [iopt] [k]=2-(Δ1+β)×Pwr[iopt,j]+pwr_his[iopt] [k] acquisition, its
The middle ∈ of Δ 1 { 1,2,3 }, 1 ＜ β ＜ 3；The position neighboring extent adj [iopt] [k] according to adj [iopt] [k]=adj [iopt]
[k]+22-Δ2Obtain, the wherein ∈ of Δ 2 { 1,2 }.
In addition, as same search terms numbering ioptUnder, can be by when the position between relevant peaks had both differed or be non-conterminous
Pos[iopt, j] and Pwr [iopt, j] and added to the end of each search terms record, that is, do the record work of a relevant peaks information
Make.At the same time it can also to adj [iopt] [k] set an initial value, this initial value can be chosen according to channel status, for example
Initial value is set as 8, this application is not construed as limiting.
In the present embodiment, a search terms is gone out especially by following method choice, so as to be obtained by the search terms selected
To master sync signal：
Obtain the score value score [i of search termsopt] [k], wherein, score [iopt] [k]=pwr_his [iopt][k]×
adj[iopt][k]；
To the score value score [i of search termsopt] [k] be ranked up, and chooses maximumAnd second largest value
WhenWhen, wherein 1 ＜ λ ＜ 3, choose maximumCorresponding search terms.
Here, the cumulative power pwr_his [i for passing through relevant peaksopt] [k] and relevant peaks position neighboring extent adj
[iopt] [k] obtain the performance of corresponding search terms, herein with score value score [iopt] [k] sign.When the search terms of best performance
Met between the search terms of performance suboptimumWhen, thought according to simulation result, the search terms of best performance is
It can be selected, so as to obtain master sync signal accordingly.
In the present embodiment, when can not temporarily select search terms, also multiple search termses to be selected are performed with a search
Item deletes operation, specifically, realizing by the following method：
By search terms score value score [iopt] [k] and thresholding ΓSCIt is compared, as search terms numbering ioptUnder it is all
score[iopt] [k] be respectively less than thresholding ΓSCWhen, the search terms is abolished, wherein0.125 ＜
γ ＜ 0.5Represent all search terms score [iopt] [k] average value.
By the above method, by search terms progress deleting necessarily, until also remaining last search terms, the thus search
Item is the search terms chosen, so as to determine therefrom that master sync signal.
By the above method, optimally, it is only necessary to which main synchronous letter can be obtained by receiving a 5ms data
Number, so as to greatly simplified the testing process to master sync signal.
In addition, in the present embodiment, the related power curve is obtained by block signal | r (τ) |2, thus, it is possible to letter
Change to the related power curve | r (τ) |2Acquisition flow, specific method is as follows：
The time-domain signal r (n) of reception is divided into M sections, r is obtainedi(m), wherein n=0,1 ..., Ns- 1, i=0,1 ... M-
1, m=0,1 ... NFFT-1；It is preferred that, the overlapping N of adjacent segmentovIndividual sampling point, wherein M and NovValue can be clever according to the actual requirements
Adjustment living, and in most back segment rM-1(m) end fills out 0.
To ri(m) implement FFT and obtain Ri(k)；
To Ri(k) cyclic shift is carried out to obtainWherein,Wherein<·>NExpression pair
Positive integer N modulus, the sample rate that order receives signal is fs, and fsIt is adjustable, FFT points NsFFTIt can adjust according to the actual requirements,
ThenAdjacent frequency interval is equal to Δf=fs·(NFFT)-1, then there is relation：fofst=Δofst·Δf
Obtain segmentation related power | ri(τ)|2, wherein,Wherein () *
It is conjugate operation, IFFT () is Inverse Fast Fourier Transform, PP-SCH(k) it is Primary Synchronisation Code frequency-region signal.
To segmentation related power | ri(τ)|2Spliced, obtain related power curve | r (τ) |2。
Wherein, above-mentioned related power curve | r (τ) |2Acquisition methods there is following theoretical foundation：
Time-domain signal x (n) is related to y's (n) to be designated as：X (n) and y (n) Fourier
Leaf transformation is X (K) and Y (K), and theory analysis is demonstratedAnd X*(k) Y (k) is a pair of Fourier transforms, therefore can be used
FFT quickly realizes correlation.
To sum up, in the present embodiment, related power curve | r (τ) |2Pass through pre-add frequency deviation fofstUnder master sync signal with
Receive signal correlation to obtain, thus, it is possible to utilize pre-add frequency deviation fofstCompensation receives the frequency deviation between signal and master sync signal,
So as to be easily detected master sync signal, the reliability of master sync signal detection is improved.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Scope.
Claims (12)
1. master sync signal detection method in a kind of LTE system, it is characterised in that including：
Search terms is configured, every search terms includes synchronous code root u information and pre-add frequency deviation fofstInformation；
The relevant peaks information of search terms is obtained, including：Obtain pre-add frequency deviation fofstUnder master sync signal to receive signal it is related
Power curve | r (τ) |2；Obtain related power curve | r (τ) |2In before NmaxPower P wr [the i of individual maximum correlation peakopt, j], with
And the position Pos [i of relevant peaksopt, j], wherein ioptRepresent search terms numbering, j ∈ { 0,1 ..., Nmax-1}；
According to the relevant peaks information of the search terms of acquisition, a search terms is chosen, is obtained by the synchronous code root u information in the search terms
Take master sync signal；
Obtaining the relevant peaks information of enable search terms also includes：Obtain the cumulative power pwr_his [i of relevant peaksopt] [k] and phase
Guan Feng position neighboring extent adj [iopt] [k], wherein k is recording indexes；
Wherein, the cumulative power pwr_his [i of relevant peaks are obtainedopt] [k] and relevant peaks position neighboring extent adj [iopt][k]
Including：In same search terms numbering ioptUnder, there is identical correlation peak location Pos [iopt, j] when, the cumulative power pwr_
his[iopt] [k] according to pwr_his [iopt] [k]=Pwr [iopt,j]+pwr_his[iopt] [k] acquisition；The adjacent journey in the position
Spend adj [iopt] [k] according to adj [iopt] [k]=adj [iopt] [k] × (1+ α) acquisitions, wherein 0 ＜ α ＜ 1.
2. master sync signal detection method in LTE system as claimed in claim 1, it is characterised in that obtain the tired of relevant peaks
Plus power pwr_his [iopt] [k] and relevant peaks position neighboring extent adj [iopt] [k] also include：
In same search terms numbering ioptUnder, there is adjacent correlation peak location Pos [iopt, j] when, the cumulative power pwr_
his[iopt] [k] according to pwr_his [iopt] [k]=2-(Δ1+β)×Pwr[iopt,j]+pwr_his[iopt] [k] acquisition, wherein Δ
1 ∈ { 1,2,3 }, 1 ＜ β ＜ 3；The position neighboring extent adj [iopt] [k] according to adj [iopt] [k]=adj [iopt][k]+22 -Δ2Obtain, the wherein ∈ of Δ 2 { 1,2 }.
3. master sync signal detection method in LTE system as claimed in claim 1, it is characterised in that choose a search terms
Including：
Obtain the score value score [i of search termsopt] [k], wherein, score [iopt] [k]=pwr_his [iopt][k]×adj
[iopt][k]；
To the score value score [i of search termsopt] [k] be ranked up, and chooses maximumAnd second largest value
WhenWhen, wherein 1 ＜ λ ＜ 3, choose maximumCorresponding search terms.
4. master sync signal detection method in LTE system as claimed in claim 3, it is characterised in that work as maximumNot
When being selected, by search terms score value score [iopt] [k] and thresholding ΓSCIt is compared, as search terms numbering ioptUnder it is all
score[iopt] [k] be respectively less than thresholding ΓSCWhen, the search terms is abolished, wherein Represent all search terms score [iopt] [k] average value.
5. master sync signal detection method in the LTE system as described in any one of Claims 1-4, it is characterised in that institute
State pre-add frequency deviation fofstSpan be { -15kHz, -7.5kHz, 0,7.5kHz, 15kHz }.
6. master sync signal detection method in the LTE system as described in any one of Claims 1-4, it is characterised in that root
The related power curve is obtained according to following method | r (τ) |2：
The time-domain signal r (n) of reception is divided into M sections, r is obtainedi(m), wherein n=0,1 ..., Ns- 1, i=0,1 ... M-1；
To ri(m) implement FFT and obtain Ri(k)；
To Ri(k) cyclic shift is carried out to obtainWherein,
Obtain segmentation related power | ri(τ)|2, wherein,
To segmentation related power | ri(τ)|2Spliced, obtain related power curve | r (τ) |2。
7. master sync signal detecting system in a kind of LTE system, it is characterised in that including：
Search terms configuration module, to configure search terms, every search terms includes synchronous code root u information and pre-add frequency deviation fofstLetter
Breath；
Relevant peaks data obtaining module, the relevant peaks information to obtain search terms, including：Obtain pre-add frequency deviation fofstUnder master
Synchronizing signal and the related power curve for receiving signal | r (τ) |2；Obtain related power curve | r (τ) |2In before NmaxIndividual maximum phase
Guan Feng power P wr [iopt, j], and relevant peaks position Pos [iopt, j], wherein ioptRepresent that search terms is numbered, j ∈ 0,
1,...,Nmax-1}；
Master sync signal determining module, to the relevant peaks information of the search terms according to acquisition, chooses a search terms, is searched by this
Synchronous code root u acquisition of information master sync signals in rope；
The relevant peaks information that the relevant peaks data obtaining module obtains enable search terms also includes：Obtain the cumulative work(of relevant peaks
Rate pwr_his [iopt] [k] and relevant peaks position neighboring extent adj [iopt] [k], wherein k is recording indexes；
Wherein, the relevant peaks data obtaining module obtains the cumulative power pwr_his [i of relevant peaksopt] [k] and relevant peaks
Position neighboring extent adj [iopt] [k] include：In same search terms numbering ioptUnder, there is identical correlation peak location Pos
[iopt, j] when, the cumulative power pwr_his [iopt] [k] according to pwr_his [iopt] [k]=Pwr [iopt,j]+pwr_his
[iopt] [k] acquisition；The position neighboring extent adj [iopt] [k] according to adj [iopt] [k]=adj [iopt] [k] × (1+ α) obtain
Take, wherein 0 ＜ α ＜ 1.
8. master sync signal detecting system in LTE system as claimed in claim 7, it is characterised in that the relevant peaks information
Acquisition module obtains the cumulative power pwr_his [i of relevant peaksopt] [k] and relevant peaks position neighboring extent adj [iopt][k]
Also include：
In same search terms numbering ioptUnder, there is adjacent correlation peak location Pos [iopt, j] when, the cumulative power pwr_
his[iopt] [k] according to pwr_his [iopt] [k]=2-(Δ1+β)×Pwr[iopt,j]+pwr_his[iopt] [k] acquisition, wherein Δ
1 ∈ { 1,2,3 }, 1 ＜ β ＜ 3；The position neighboring extent adj [iopt] [k] according to adj [iopt] [k]=adj [iopt][k]+22 -Δ2Obtain, the wherein ∈ of Δ 2 { 1,2 }.
9. master sync signal detecting system in LTE system as claimed in claim 7, it is characterised in that the master sync signal
Determining module, which chooses a search terms, to be included：
Obtain the score value score [i of search termsopt] [k], wherein, score [iopt] [k]=pwr_his [iopt][k]×adj
[iopt][k]；
To the score value score [i of search termsopt] [k] be ranked up, and chooses maximumAnd second largest value
WhenWhen, wherein 1 ＜ λ ＜ 3, choose maximumCorresponding search terms.
10. master sync signal detecting system in LTE system as claimed in claim 9, it is characterised in that the master sync signal
Determining module works as maximumWhen unselected, by search terms score value score [iopt] [k] and thresholding ΓSCIt is compared, when
Search terms numbering ioptUnder all score [iopt] [k] be respectively less than thresholding ΓSCWhen, the search terms is abolished, wherein Represent all search terms score [iopt]
The average value of [k].
11. master sync signal detecting system in the LTE system as described in any one of claim 7 to 10, it is characterised in that
The pre-add frequency deviation fofstSpan be { -15kHz, -7.5kHz, 0,7.5kHz, 15kHz }.
12. master sync signal detecting system in the LTE system as described in any one of claim 7 to 10, it is characterised in that
Relevant peaks data obtaining module obtains the related power curve according to following method | r (τ) |2：
The time-domain signal r (n) of reception is divided into M sections, r is obtainedi(m), wherein n=0,1 ..., Ns- 1, i=0,1 ... M-1；
To ri(m) implement FFT and obtain Ri(k)；
To Ri(k) cyclic shift is carried out to obtainWherein,
Obtain segmentation related power | ri(τ)|2, wherein,
To segmentation related power | ri(τ)|2Spliced, obtain related power curve | r (τ) |2。
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| EP2383950A2 (en) * | 2010-03-10 | 2011-11-02 | Broadcom Corporation | A method and system for iterative multiple frequency hypothesis testing with cell-id detection in an e-ultra/lte ue receiver |
| CN102480455A (en) * | 2010-11-26 | 2012-05-30 | 联芯科技有限公司 | Detecting method and detecting device for primary synchronization signals in long-term evolution system |
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| EP2383950A2 (en) * | 2010-03-10 | 2011-11-02 | Broadcom Corporation | A method and system for iterative multiple frequency hypothesis testing with cell-id detection in an e-ultra/lte ue receiver |
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