CN103906103A - Method and system for detecting main synchronous signal in LTE system - Google Patents

Method and system for detecting main synchronous signal in LTE system Download PDF

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CN103906103A
CN103906103A CN201210587831.4A CN201210587831A CN103906103A CN 103906103 A CN103906103 A CN 103906103A CN 201210587831 A CN201210587831 A CN 201210587831A CN 103906103 A CN103906103 A CN 103906103A
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search terms
sync signal
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CN103906103B (en
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金小龙
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Leadcore Technology Co Ltd
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Abstract

The invention provides a method and system for detecting a main synchronous signal in an LTE system. A related power curve /r(tau)/2 is relatively obtained through the main synchronous signal and a receiving signal under pre-added frequency offset fofst, the frequency offset between the receiving signal and the main synchronous signal can be compensated for through the pre-added frequency offset fofst, and therefore the main synchronous signal is easily detected, and reliability of detection of the main synchronous signal is improved.

Description

Master sync signal detection method and detection system in LTE system
Technical field
The present invention relates to mobile communication technology field, particularly master sync signal detection method and detection system in a kind of LTE system.
Background technology
Along with the development of mobile communication and wireless access wide band technology, Long Term Evolution LTE(Long Term Evolution) technology is with its high transfer rate, the advantages such as little user plane latency and support terminal high-speed mobile, become the mainstream technology that next-generation mobile communications develop.For cell mobile communication systems, Cell searching is the first step of mobile terminal access of radio network, is one of the most basic flow process of physical layer.In the time that terminal is started shooting access community and handover first, need to carry out Cell searching and set up Time and Frequency Synchronization, obtain numbering and other system configuration information in the group of physical-layer cell, behind access community, terminal could receive cell system message, connects, and communicates process.
LTE Cell searching is detected and is realized by master sync signal (P-SCH) and auxiliary synchronous signals (S-SCH).Master sync signal and auxiliary synchronous signals periodically send in the fixed position of every radio frames, and its particular location refers to Fig. 1.On frequency domain, master sync signal is generated by the Zadoff-Chu sequence at frequency domain, and its value is:
d u ( n ) = e - j πun ( n + 1 ) 63 n = 0,1 , . . . , 30 e - j πu ( n + 1 ) ( n + 2 ) 63 n = 31,32 , . . . , 61
Wherein, the value of u is by numbering in cell ID group
Figure BDA00002680155100012
determine, physical relationship is between the two as shown in following table one:
Figure BDA00002680155100013
Figure BDA00002680155100021
Table one
Master sync signal is positioned at the mid portion of system bandwidth, occupies altogether 62 subcarriers, and each five subcarriers of its adjacent both sides retain need not, its frequency-domain structure is as shown in Figure 2.
No matter, at time domain or frequency domain, master sync signal all has good auto-correlation and their cross correlation, has 3 groups, for completing Symbol Timing and frequency offset correction, has also carried the information of numbering in cell ID group simultaneously.Existing technical scheme has been utilized auto-correlation and the their cross correlation that master sync signal is good, average, merging is implemented in the position of many groups of (fixing 10 groups) continuous 5ms time-domain signals and the relevant peaks of time domain master sync signal, thereby find the position of the relevant peaks of possibility maximum, thereby determine numbering in cell ID group
Figure BDA00002680155100022
But in LTE system, signal can configure on multiple frequency bands, specifically please refer to following table two:
Table two
In each frequency band, adjacent channel center frequency point is spaced apart 100kHz, and the center frequency point integral multiple that is 100kHz.LTE has multiple possible bandwidth, comprises 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz.To each band width configuration, synchronizing signal is all positioned at the middle 0.96MHz of system bandwidth.Frequency grid is that 100kHz makes the possible center frequency point number in each frequency band a lot, and adaptive-bandwidth makes again to determine that center frequency point is more difficult.Taking frequency band 40(2300MHz ~ 2400MHz) be example, its possible center frequency point number is about 1000(and puts aside the impact of frequency band boundary herein).The implementation method of existing terminal is to obtain one group by the center frequency point list (being spaced apart 100kHz) after the sequence of possibility size, then from list, takes out successively a center frequency point f i, at f iupper detection master sync signal.Mainly at f i+ Δ f bmaster sync signal is detected at frequency place.When | Δ f b| when larger, the probability that can't detect master sync signal sharply increases, once at f i+ Δ f bon can't detect master sync signal, receiver will skip to next center frequency point f iplace continues to detect, because | f j-f i|>=100kHz, this will lose the chance that synchronizing signal detected.In addition, in prior art, in the time that channel circumstance is more excellent, still needs to receive 10 groups of 5ms data and just can complete master sync signal detection, algorithm time complexity is larger.
Summary of the invention
The object of the present invention is to provide master sync signal detection method and detection system in a kind of LTE system, to solve in prior art, in the time that frequency deviation is larger, will occur easily can't detect the problem of master sync signal.
For solving the problems of the technologies described above, the invention provides master sync signal detection method in a kind of LTE system, in described LTE system, master sync signal detection method comprises:
Configuration search terms, every search terms comprises synchronous code root u information and adds in advance frequency deviation f ofstinformation;
The relevant peaks information of obtaining search terms, comprising: obtain and add in advance frequency deviation f ofstunder master sync signal with receive the related power curve of signal | r (τ) | 2; Obtain related power curve | r (τ) | 2in before N maxthe power P wr[i of individual maximum correlation peak opt, j], and the position Pos[i of relevant peaks opt, j], wherein i optrepresent search terms numbering, j ∈ 0,1 ..., N max-1};
According to the relevant peaks information of the search terms obtaining, choose a search terms, by the synchronous code root u acquisition of information master sync signal in this search terms.
Optionally, in described LTE system in master sync signal detection method, obtain the relevant peaks information that enables search terms and also comprise: the cumulative power pwr_his[i that obtains relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k], wherein k is recording indexes.
Optionally, in described LTE system, in master sync signal detection method, obtain the cumulative power pwr_his[i of relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k] comprising:
At same search terms numbering i optunder, there is identical correlation peak location Pos[i opt, j] time, described cumulative power pwr_his[i opt] [k] according to pwr_his[i opt] [k]=Pwr[i opt, j] and+pwr_his[i opt] [k] obtain; The adjacent degree adj[i in described position opt] [k] according to adj[i opt] [k]=adj[i opt] [k] × (1+ α) obtain, wherein 0 < α < 1.
Optionally, in described LTE system, in master sync signal detection method, obtain the cumulative power pwr_his[i of relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k] also comprise:
At same search terms numbering i optunder, there is adjacent correlation peak location Pos[i opt, j] time, described cumulative power pwr_his[i opt] [k] according to pwr_his[i opt] [k]=2 -(Δ 1+ β)× Pwr[i opt, j] and+pwr_his[i opt] [k] obtain, wherein Δ 1 ∈ { 1,2,3}, 1 < β < 3; The adjacent degree adj[i in described position opt] [k] according to adj[i opt] [k]=adj[i opt] [k]+2 2-Δ 2obtain, wherein Δ 2 ∈ { 1,2}.
Optionally, in described LTE system, in master sync signal detection method, choose a search terms and comprise:
Obtain the score value score[i of search terms opt] [k], wherein, score[i opt] [k]=pwr_his[i opt] [k] × adj[i opt] [k];
To the score value score[i of search terms opt] [k] sort, and chooses maximum
Figure BDA00002680155100041
and second largest value
Figure BDA00002680155100042
When
Figure BDA00002680155100043
time, wherein 1 < λ < 3, chooses maximum
Figure BDA00002680155100044
corresponding search terms.
Optionally, in described LTE system, in master sync signal detection method, work as maximum
Figure BDA00002680155100045
while not being selected, by search terms score value score[i opt] [k] and thresholding Γ sCcompare, as search terms numbering i optlower all score[i opt] [k] be all less than thresholding Γ sCtime, abolish this search terms, wherein
Figure BDA00002680155100046
0.125 < γ < 0.5
Figure BDA00002680155100047
represent all search terms score[i opt] mean value of [k].
Optionally, in described LTE system in master sync signal detection method, the described frequency deviation f that adds in advance ofstspan be { 15kHz ,-7.5kHz, 0,7.5kHz, 15kHz}.
Optionally, in described LTE system, in master sync signal detection method, obtain described related power curve according to following method | r (τ) | 2:
The time-domain signal r (n) receiving is divided into M section, obtains r i(m), wherein n=0,1 ..., N s-1, i=0,1 ... M-1;
To r i(m) implement fast fourier transform and obtain R i(k);
To R i(k) carrying out cyclic shift obtains
Figure BDA00002680155100051
wherein,
Figure BDA00002680155100052
Obtain segmentation related power | r i(τ) | 2, wherein, | r i ( &tau; ) | 2 = | IFFT ( R ~ i ( k ) &CenterDot; ( P P - SCH ( k ) ) * ) | 2 ;
To segmentation related power | r i(τ) | 2splice, obtain related power curve | r (τ) | 2.
The present invention also provides master sync signal detection system in a kind of LTE system, and in described LTE system, master sync signal detection system comprises:
Search terms configuration module, in order to configure search terms, every search terms comprises synchronous code root u information and adds in advance frequency deviation f ofstinformation;
Relevant peaks acquisition of information module, in order to obtain the relevant peaks information of search terms, comprising: obtain and add in advance frequency deviation f ofstunder master sync signal with receive the related power curve of signal | r (τ) | 2; Obtain related power curve | r (τ) | 2in before N maxthe power P wr[i of individual maximum correlation peak opt, j], and the position Pos[i of relevant peaks opt, j], wherein i optrepresent search terms numbering, j ∈ 0,1 ..., N max-1};
Master sync signal determination module, in order to according to the relevant peaks information of the search terms obtaining, chooses a search terms, by the synchronous code root u acquisition of information master sync signal in this search terms.
Optionally, in described LTE system in master sync signal detection system, described relevant peaks acquisition of information module is obtained the relevant peaks information that enables search terms and is also comprised: the cumulative power pwr_his[i that obtains relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k], wherein k is recording indexes.
Optionally, in described LTE system, in master sync signal detection system, described relevant peaks acquisition of information module is obtained the cumulative power pwr_his[i of relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k] comprising:
At same search terms numbering i optunder, there is identical correlation peak location Pos[i opt, j] time, described cumulative power pwr_his[i opt] [k] according to pwr_his[i opt] [k]=Pwr[i opt, j] and+pwr_his[i opt] [k] obtain; The adjacent degree adj[i in described position opt] [k] according to adj[i opt] [k]=adj[i opt] [k] × (1+ α) obtain, wherein 0 < α < 1.
Optionally, in described LTE system, in master sync signal detection system, described relevant peaks acquisition of information module is obtained the cumulative power pwr_his[i of relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k] also comprise:
At same search terms numbering i optunder, there is adjacent correlation peak location Pos[i opt, j] time, described cumulative power pwr_his[i opt] [k] according to pwr_his[i opt] [k]=2 -(Δ 1+ β)× Pwr[i opt, j] and+pwr_his[i opt] [k] obtain, wherein Δ 1 ∈ { 1,2,3}, 1 < β < 3; The adjacent degree adj[i in described position opt] [k] according to adj[i opt] [k]=adj[i opt] [k]+2 2-Δ 2obtain, wherein Δ 2 ∈ { 1,2}.
Optionally, in described LTE system, in master sync signal detection system, described master sync signal determination module is chosen a search terms and is comprised:
Obtain the score value score[i of search terms opt] [k], wherein, score[i opt] [k]=pwr_his[i opt] [k] × adj[i opt] [k];
To the score value score[i of search terms opt] [k] sort, and chooses maximum
Figure BDA00002680155100061
and second largest value
When
Figure BDA00002680155100063
time, wherein 1 < λ < 3, chooses maximum
Figure BDA00002680155100064
corresponding search terms.
Optionally, in described LTE system, in master sync signal detection system, described master sync signal determination module is worked as maximum
Figure BDA00002680155100065
while not being selected, by search terms score value score[i opt] [k] and thresholding Γ sCcompare, as search terms numbering i optlower all score[i opt] [k] be all less than thresholding Γ sCtime, abolish this search terms, wherein 0.125 < γ < 0.5
Figure BDA00002680155100067
represent all search terms score[i opt] mean value of [k].
Optionally, in described LTE system in master sync signal detection system, the described frequency deviation f that adds in advance ofstspan be { 15kHz ,-7.5kHz, 0,7.5kHz, 15kHz}.
Optionally, in described LTE system, in master sync signal detection system, relevant peaks acquisition of information module is obtained described related power curve according to following method | r (τ) | 2:
The time-domain signal r (n) receiving is divided into M section, obtains r i(m), wherein n=0,1 ..., N s-1, i=0,1 ... M-1;
To r i(m) implement fast fourier transform and obtain R i(k);
To R i(k) carrying out cyclic shift obtains
Figure BDA00002680155100071
wherein,
Figure BDA00002680155100072
Obtain segmentation related power | r i(τ) | 2, wherein, | r i ( &tau; ) | 2 = | IFFT ( R ~ i ( k ) &CenterDot; ( P P - SCH ( k ) ) * ) | 2 ;
To segmentation related power | r i(τ) | 2splice, obtain related power curve | r (τ) | 2.
In LTE system provided by the invention in master sync signal detection method and detection system, related power curve | r (τ) | 2by adding in advance frequency deviation f ofstunder master sync signal with receive signal correction obtain, can utilize thus and add in advance frequency deviation f ofstcompensation receives the frequency deviation between signal and master sync signal, thereby is easy to detect master sync signal, improves the reliability that master sync signal detects.
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 frequency domain;
Fig. 3 is the schematic flow sheet of master sync signal detection method in the LTE system of the embodiment of the present invention;
Fig. 4 is the module diagram of master sync signal detection system in the LTE system of the embodiment of the present invention.
Embodiment
In LTE system the present invention being proposed below in conjunction with the drawings and specific embodiments, master sync signal detection method and detection system are described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the object of the aid illustration embodiment of the present invention lucidly.
Please refer to Fig. 3, the schematic flow sheet of master sync signal detection method in the LTE system that it is the embodiment of the present invention.As shown in Figure 3, in described LTE system, master sync signal detection method comprises:
S30: configuration search terms, every search terms comprises synchronous code root u information and adds in advance frequency deviation f ofstinformation;
S31: obtain the relevant peaks information of search terms, comprising: obtain and add in advance frequency deviation f ofstunder master sync signal with receive the related power curve of signal | r (τ) | 2; Obtain related power curve | r (τ) | 2in before N maxthe power P wr[i of individual maximum correlation peak opt, j], and the position Pos[i of relevant peaks opt, j], wherein i optrepresent search terms numbering, j ∈ 0,1 ..., N max-1};
S32: according to the relevant peaks information of the search terms obtaining, choose a search terms, by the synchronous code root u acquisition of information master sync signal in this search terms.
Accordingly, the present embodiment also provides master sync signal detection system in a kind of LTE system, concrete, please refer to Fig. 4, the module diagram of master sync signal detection system in the LTE system that it is the embodiment of the present invention.As shown in Figure 4, in described LTE system, master sync signal detection system comprises:
Search terms configuration module 40, in order to configure search terms, every search terms comprises synchronous code root u information and adds in advance frequency deviation f ofstinformation;
Relevant peaks acquisition of information module 41, in order to obtain the relevant peaks information of search terms, comprising: obtain and add in advance frequency deviation f ofstunder master sync signal with receive the related power curve of signal | r (τ) | 2; Obtain related power curve | r (τ) | 2in before N maxthe power P wr[i of individual maximum correlation peak opt, j], and the position Pos[i of relevant peaks opt, j], wherein i optrepresent search terms numbering, j ∈ 0,1 ..., N max-1};
Master sync signal determination module 42, in order to according to the relevant peaks information of the search terms obtaining, chooses a search terms, by the synchronous code root u acquisition of information master sync signal in this search terms.
Wherein synchronous code root u ∈ { 25,29,34}, i.e. numbering in described synchronous code root u and cell ID group
Figure BDA00002680155100081
corresponding.Preferably, the described frequency deviation f that adds in advance ofstspan be { 15kHz ,-7.5kHz, 0,7.5kHz, 15kHz}.At this, draw the described frequency deviation f that adds in advance according to simulation result ofstpreferred span be { 15kHz ,-7.5kHz, 0,7.5kHz, 15kHz}; In other embodiments of the invention, in the time that channel status changes, the described frequency deviation f that adds in advance ofstalso can get other frequency values.
In the present embodiment, every search terms can also comprise enable signal Flag, indicates whether need described search terms to carry out the operation of relevant peaks acquisition of information by described enable signal Flag, thereby can easy flow process.
In the present embodiment, obtaining the relevant peaks information that enables search terms also comprises: the cumulative power pwr_his[i that obtains relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k], wherein k is recording indexes.At this, described adjacent degree adj[i opt] [k] according to the position Pos[i of one or more relevant peaks (wherein, multiple relevant peaks are obtained by the data receiver of 5ms repeatedly, and this is prior art, and the application repeats no more this) opt, j] between spacing/relation obtain.Wherein, according to same search terms numbering i optunder, the difference of relevant peak-to-peak position relationship, described cumulative power pwr_his[i opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k] specifically can determine by the following method:
At same search terms numbering i optunder, there is identical correlation peak location Pos[i opt, j] time, described cumulative power pwr_his[i opt] [k] according to pwr_his[i opt] [k]=Pwr[i opt, j] and+pwr_his[i opt] [k] obtain; The adjacent degree adj[i in described position opt] [k] according to adj[i opt] [k]=adj[i opt] [k] × (1+ α) obtain, wherein 0 < α < 1;
At same search terms numbering i optunder, there is adjacent correlation peak location Pos[i opt, j] time, described cumulative power pwr_his[i opt] [k] according to pwr_his[i opt] [k]=2 -(Δ 1+ β)× Pwr[i opt, j] and+pwr_his[i opt] [k] obtain, wherein Δ 1 ∈ { 1,2,3}, 1 < β < 3; The adjacent degree adj[i in described position opt] [k] according to adj[i opt] [k]=adj[i opt] [k]+2 2-Δ 2obtain, wherein Δ 2 ∈ { 1,2}.
In addition, as same search terms numbering i optunder, when relevant peak-to-peak position is neither identical also non-conterminous, can be by Pos[i opt, j] and Pwr[i opt, j] and be added into the end that each search terms records, do the work of a relevant peaks recording of information.Meanwhile, can also be to adj[i opt] [k] arrange an initial value, this initial value can be chosen according to channel status, and for example setting initial value is 8, and this application is not construed as limiting.
In the present embodiment, specifically select by the following method a search terms, thereby obtain master sync signal by the search terms that this is selected:
Obtain the score value score[i of search terms opt] [k], wherein, score[i opt] [k]=pwr_his[i opt] [k] × adj[i opt] [k];
To the score value score[i of search terms opt] [k] sort, and chooses maximum and second largest value
Figure BDA00002680155100102
When time, wherein 1 < λ < 3, chooses maximum
Figure BDA00002680155100104
corresponding search terms.
At this, by the cumulative power pwr_his[i of relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k] obtain the performance of corresponding search terms, at this with score value score[i opt] [k] sign.Between the search terms of best performance and the search terms of performance suboptimum, meet
Figure BDA00002680155100105
time, to think according to simulation result, the search terms of best performance can be selected, thereby obtains master sync signal accordingly.
In the present embodiment, in the time temporarily cannot selecting search terms, also multiple search termses to be selected are carried out to a search terms and delete operation, concrete, realize by the following method:
By search terms score value score[i opt] [k] and thresholding Γ sCcompare, as search terms numbering i optlower all score[i opt] [k] be all less than thresholding Γ sCtime, abolish this search terms, wherein
Figure BDA00002680155100106
0.125 < γ < 0.5
Figure BDA00002680155100107
represent all search terms score[i opt] mean value of [k].
By said method, search terms is carried out to certain deleting, until also remain last search terms, this search terms is the search terms of choosing thus, thereby determines master sync signal accordingly.
Known by said method, optimum in the situation that, only need to receive 5ms data and can obtain master sync signal, thereby simplified greatly the testing process to master sync signal.
In addition, in the present embodiment, obtain described related power curve by block signal | r (τ) | 2, can simplify thus described related power curve | r (τ) | 2obtain flow process, concrete grammar is as follows:
The time-domain signal r (n) receiving is divided into M section, obtains r i(m), wherein n=0,1 ..., N s-1, i=0,1 ... M-1, m=0,1 ... N fFT-1; Preferably, the overlapping N of adjacent segment ovindividual sampling point, wherein M and N ovvalue can adjust flexibly according to the actual requirements, and in the end section r m-1(m) end fills out 0.
To r i(m) implement fast fourier transform and obtain R i(k);
To R i(k) carrying out cyclic shift obtains
Figure BDA00002680155100108
wherein,
Figure BDA00002680155100109
wherein <> nrepresent to align Integer N delivery, the sample rate that order receives signal is f s, and f scapable of regulating, FFT points N fFTcan adjust according to the actual requirements,
Figure BDA00002680155100111
adjacent frequency interval equals Δ f=f s(N fFT) -1so, have relation: f ofst=Δ ofstΔ f
Obtain segmentation related power | r i(τ) | 2, wherein, | r i ( &tau; ) | 2 = | IFFT ( R ~ i ( k ) &CenterDot; ( P P - SCH ( k ) ) * ) | 2 ; Wherein () * is conjugate operation, and IFFT (.) is quick inverse-Fourier transform, P p-SCH(k) be Primary Synchronisation Code frequency-region signal.
To segmentation related power | r i(τ) | 2splice, obtain related power curve | r (τ) | 2.
Wherein, above-mentioned related power curve | r (τ) | 2acquisition methods there is following theoretical foundation:
Relevant being designated as of time-domain signal x (n) and y (n):
Figure BDA00002680155100113
the Fourier transform of x (n) and y (n) is X (K) and Y (K), and theory analysis has proved
Figure BDA00002680155100114
and X *(k) Y (k) is a pair of Fourier transform, therefore can realize fast relevant with FFT.
To sum up, in the present embodiment, related power curve | r (τ) | 2by adding in advance frequency deviation f ofstunder master sync signal with receive signal correction obtain, can utilize thus and add in advance frequency deviation f ofstcompensation receives the frequency deviation between signal and master sync signal, thereby is easy to detect master sync signal, improves the reliability that master sync signal detects.
Foregoing description is only the description to preferred embodiment of the present invention, the not any restriction to the scope of the invention, and any change, modification that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, all belong to the protection range of claims.

Claims (16)

1. a master sync signal detection method in LTE system, is characterized in that, comprising:
Configuration search terms, every search terms comprises synchronous code root u information and adds in advance frequency deviation f ofstinformation;
The relevant peaks information of obtaining search terms, comprising: obtain and add in advance frequency deviation f ofstunder master sync signal with receive the related power curve of signal | r (τ) | 2; Obtain related power curve | r (τ) | 2in before N maxthe power P wr[i of individual maximum correlation peak opt, j], and the position Pos[i of relevant peaks opt, j], wherein i optrepresent search terms numbering, j ∈ 0,1 ..., N max-1};
According to the relevant peaks information of the search terms obtaining, choose a search terms, by the synchronous code root u acquisition of information master sync signal in this search terms.
2. master sync signal detection method in LTE system as claimed in claim 1, is characterized in that, obtains the relevant peaks information that enables search terms and also comprises: the cumulative power pwr_his[i that obtains relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k], wherein k is recording indexes.
3. master sync signal detection method in LTE system as claimed in claim 2, is characterized in that, obtains the cumulative power pwr_his[i of relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k] comprising:
At same search terms numbering i optunder, there is identical correlation peak location Pos[i opt, j] time, described cumulative power pwr_his[i opt] [k] according to pwr_his[i opt] [k]=Pwr[i opt, j] and+pwr_his[i opt] [k] obtain; The adjacent degree adj[i in described position opt] [k] according to adj[i opt] [k]=adj[i opt] [k] × (1+ α) obtain, wherein 0 < α < 1.
4. master sync signal detection method in LTE system as claimed in claim 2, is characterized in that, obtains the cumulative power pwr_his[i of relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k] also comprise:
At same search terms numbering i optunder, there is adjacent correlation peak location Pos[i opt, j] time, described cumulative power pwr_his[i opt] [k] according to pwr_his[i opt] [k]=2 -(Δ 1+ β)× Pwr[i opt, j] and+pwr_his[i opt] [k] obtain, wherein Δ 1 ∈ { 1,2,3}, 1 < β < 3; The adjacent degree adj[i in described position opt] [k] according to adj[i opt] [k]=adj[i opt] [k]+2 2-Δ 2obtain, wherein Δ 2 ∈ { 1,2}.
5. master sync signal detection method in LTE system as claimed in claim 2, is characterized in that, chooses a search terms and comprises:
Obtain the score value score[i of search terms opt] [k], wherein, score[i opt] [k]=pwr_his[i opt] [k] × adj[i opt] [k];
To the score value score[i of search terms opt] [k] sort, and chooses maximum
Figure FDA00002680155000021
and second largest value
Figure FDA00002680155000022
When
Figure FDA00002680155000023
time, wherein 1 < λ < 3, chooses maximum
Figure FDA00002680155000024
corresponding search terms.
6. master sync signal detection method in LTE system as claimed in claim 5, is characterized in that, works as maximum while not being selected, by search terms score value score[i opt] [k] and thresholding Γ sCcompare, as search terms numbering i optlower all score[i opt] [k] be all less than thresholding Γ sCtime, abolish this search terms, wherein
Figure FDA00002680155000026
0.125 < γ < 0.5
Figure FDA00002680155000027
represent all search terms score[i opt] mean value of [k].
7. master sync signal detection method in the LTE system as described in any one in claim 1 to 6, is characterized in that, the described frequency deviation f that adds in advance ofstspan be { 15kHz ,-7.5kHz, 0,7.5kHz, 15kHz}.
8. master sync signal detection method in the LTE system as described in any one in claim 1 to 6, is characterized in that, obtains described related power curve according to following method | r (τ) | 2:
The time-domain signal r (n) receiving is divided into M section, obtains r i(m), wherein n=0,1 ..., N s-1, i=0,1 ... M-1;
To r i(m) implement fast fourier transform and obtain R i(k);
To R i(k) carrying out cyclic shift obtains
Figure FDA00002680155000028
wherein,
Figure FDA00002680155000029
Obtain segmentation related power | r i(τ) | 2, wherein, | r i ( &tau; ) | 2 = | IFFT ( R ~ i ( k ) &CenterDot; ( P P - SCH ( k ) ) * ) | 2 ;
To segmentation related power | r i(τ) | 2splice, obtain related power curve | r (τ) | 2.
9. a master sync signal detection system in LTE system, is characterized in that, comprising:
Search terms configuration module, in order to configure search terms, every search terms comprises synchronous code root u information and adds in advance frequency deviation f ofstinformation;
Relevant peaks acquisition of information module, in order to obtain the relevant peaks information of search terms, comprising: obtain and add in advance frequency deviation f ofstunder master sync signal with receive the related power curve of signal | r (τ) | 2; Obtain related power curve | r (τ) | 2in before N maxthe power P wr[i of individual maximum correlation peak opt, j], and the position Pos[i of relevant peaks opt, j], wherein i optrepresent search terms numbering, j ∈ 0,1 ..., N max-1};
Master sync signal determination module, in order to according to the relevant peaks information of the search terms obtaining, chooses a search terms, by the synchronous code root u acquisition of information master sync signal in this search terms.
10. master sync signal detection system in LTE system as claimed in claim 9, is characterized in that, described relevant peaks acquisition of information module is obtained the relevant peaks information that enables search terms and also comprised: the cumulative power pwr_his[i that obtains relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k], wherein k is recording indexes.
Master sync signal detection system in 11. LTE systems as claimed in claim 10, is characterized in that, described relevant peaks acquisition of information module is obtained the cumulative power pwr_his[i of relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k] comprising:
At same search terms numbering i optunder, there is identical correlation peak location Pos[i opt, j] time, described cumulative power pwr_his[i opt] [k] according to pwr_his[i opt] [k]=Pwr[i opt, j] and+pwr_his[i opt] [k] obtain; The adjacent degree adj[i in described position opt] [k] according to adj[i opt] [k]=adj[i opt] [k] × (1+ α) obtain, wherein 0 < α < 1.
Master sync signal detection system in 12. LTE systems as claimed in claim 10, is characterized in that, described relevant peaks acquisition of information module is obtained the cumulative power pwr_his[i of relevant peaks opt] the adjacent degree adj[i in position of [k] and relevant peaks opt] [k] also comprise:
At same search terms numbering i optunder, there is adjacent correlation peak location Pos[i opt, j] time, described cumulative power pwr_his[i opt] [k] according to pwr_his[i opt] [k]=2 -(Δ 1+ β)× Pwr[i opt, j] and+pwr_his[i opt] [k] obtain, wherein Δ 1 ∈ { 1,2,3}, 1 < β < 3; The adjacent degree adj[i in described position opt] [k] according to adj[i opt] [k]=adj[i opt] [k]+2 2-Δ 2obtain, wherein Δ 2 ∈ { 1,2}.
Master sync signal detection system in 13. LTE systems as claimed in claim 10, is characterized in that, described master sync signal determination module is chosen a search terms and comprised:
Obtain the score value score[i of search terms opt] [k], wherein, score[i opt] [k]=pwr_his[i opt] [k] × adj[i opt] [k];
To the score value score[i of search terms opt] [k] sort, and chooses maximum
Figure FDA00002680155000041
and second largest value
Figure FDA00002680155000042
When
Figure FDA00002680155000043
time, wherein 1 < λ < 3, chooses maximum
Figure FDA00002680155000044
corresponding search terms.
Master sync signal detection system in 14. LTE systems as claimed in claim 13, is characterized in that, described master sync signal determination module is worked as maximum while not being selected, by search terms score value score[i opt] [k] and thresholding Γ sCcompare, as search terms numbering i optlower all score[i opt] [k] be all less than thresholding Γ sCtime, abolish this search terms, wherein
Figure FDA00002680155000046
0.125 < γ < 0.5 represent all search terms score[i opt] mean value of [k].
Master sync signal detection system in 15. LTE systems as described in any one in claim 9 to 14, is characterized in that the described frequency deviation f that adds in advance ofstspan be { 15kHz ,-7.5kHz, 0,7.5kHz, 15kHz}.
Master sync signal detection system in 16. LTE systems as described in any one in claim 9 to 14, is characterized in that, relevant peaks acquisition of information module is obtained described related power curve according to following method | r (τ) | 2:
The time-domain signal r (n) receiving is divided into M section, obtains r i(m), wherein n=0,1 ..., N s-1, i=0,1 ... M-1;
To r i(m) implement fast fourier transform and obtain R i(k);
To R i(k) carrying out cyclic shift obtains wherein,
Figure FDA00002680155000049
Obtain segmentation related power | r i(τ) | 2, wherein, | r i ( &tau; ) | 2 = | IFFT ( R ~ i ( k ) &CenterDot; ( P P - SCH ( k ) ) * ) | 2 ;
To segmentation related power | r i(τ) | 2splice, obtain related power curve | r (τ) | 2.
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