CN104796372B - A kind of descending auxiliary synchronous signals detection method of LTE system for realizing low complex degree - Google Patents
A kind of descending auxiliary synchronous signals detection method of LTE system for realizing low complex degree Download PDFInfo
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Abstract
The invention discloses a kind of descending auxiliary synchronous signals detection method of LTE system for realizing low complex degree, including：By the auxiliary synchronous reception signal of time domain by frequency overlapped-resistable filter filter, it is then down-sampled obtain it is down-sampled after the auxiliary synchronous reception signal of time domain；The auxiliary synchronous reception signal of time domain after down-sampled does FFT to obtain the auxiliary synchronous reception signal of frequency domain；The auxiliary synchronous reception signal of frequency domain makes the difference a point related operation with the sequence in auxiliary synchronous signals copy sequence group after frequency domain scrambling and obtains correlation；Selection causes the maximum index of correlation to estimate small district's groups id information and system frame timing information.Compared with prior art, the present invention can be realized with relatively low implementation complexity, and while computation complexity is not increased, significantly improve the Differential Detection performance of LTE system downlink auxiliary synchronous signals.
Description
Technical field
The present invention relates to a kind of detection method of the descending auxiliary synchronous signals of LTE system, and more particularly to this method is specific real
A kind of current low complex degree implementation.
Background technology
In order to preferably carry out system cell search, LTE protocol standard defines primary synchronization channel (P-SCH) and auxiliary synchronization
Channel (S-SCH), is respectively intended to transmit the master sync signal of id information in carrying system Symbol Timing and small district's groups, and carries
The auxiliary synchronous signals of frame timing information and small district's groups ID.Auxiliary synchronous signals are mainly formed by the cascade that interlocks of two m-sequences, specifically
Generation expression formula can be shown in consensus standard.
The detection of auxiliary synchronous signals is typically to be carried out after master sync signal detects successfully, now the Symbol Timing of system
Therefore information in time domain or frequency domain to auxiliary synchronous signals it has been determined that can detect.In order to obtain preferably detection property
Can, generally select frequency domain detection method.According to whether utilize frequency domain channel state information (Channel State
Information, CSI), frequency domain detection method can be divided into coherence detection and non-coherent detection methods again.Relevant detection side
Method generally to be preferred over non-coherent detection methods due to having used CSI in performance.
Coherence detection needs to do primary synchronization channel channel estimation to obtain because to use the CSI of system
The estimate of primary synchronization channel, so as to the approximate estimate as auxiliary synchronization channel.Accurate channel estimation module means to need
Substantial amounts of computing resource is wanted, and because big Matrix for Inverse Problem be present, computation complexity is high.In addition, when channel it is relevant when
Between when being less than OFDM (Orthogonal Frequency Division Multiplexing) symbol, primary synchronization channel value
Differed greatly with auxiliary synchronization channel value, have a strong impact on the performance of auxiliary synchronous signals coherence detection.For these reasons, it is actual
Mobile station generally selects non-coherent detection methods when doing search of initial zone in, wherein based on difference detecting method.
Conventional difference detecting method needs to estimate the deviant of two m-sequences stage by stage, and is used when seeking difference correlation
The adjacent sub-carrier signal conjugate multiplication being spaced apart on frequency domain, performance loss is serious compared with coherence detection.Therefore, this hair
It is bright to propose a kind of LTE system downlink auxiliary synchronous signals detection method for realizing low complex degree, it can be calculated again not increasing
It is miscellaneous while spend, it is obviously improved the performance of auxiliary synchronous signals difference detecting method.
The content of the invention
Goal of the invention：In view of the shortcomings of the prior art, it is descending to propose a kind of LTE system for realizing low complex degree by the present invention
Link auxiliary synchronous signals detection method, realizes the detection to the auxiliary synchronous signals in LTE system, and significantly improve Differential Detection
The performance of method.
Technical scheme：A kind of LTE system downlink auxiliary synchronous signals detection method for realizing low complex degree of the present invention
Including：
The first step, the auxiliary synchronous reception signal of time domain is filtered by frequency overlapped-resistable filter first, it is then down-sampled to be dropped
The auxiliary synchronous reception signal of time domain after sampling；
Second step, will be down-sampled after the auxiliary synchronous reception signal of time domain do FFT frequency domain is auxiliary synchronous to receive letter to obtain
Number；
3rd step, the sequence after the auxiliary synchronous reception signal of frequency domain is scrambled with frequency domain in auxiliary synchronous signals copy sequence group are done
Difference related operation obtains correlation；
4th step, choose and cause the index of sequence in auxiliary synchronous signals copy sequence group that correlation is maximum to estimate cell
Group id information and system frame timing information.
Further, frequency overlapped-resistable filter uses L in the first stepfThe realization of rank FIR filter, filter coefficient center
Symmetrical ai=aN-i, i=1,2 ..., Lf/ 2-1, the output of wave filter is down-sampled by M times again, obtain it is down-sampled after output.
Further, frequency overlapped-resistable filter uses FIR filter in the first step, and down-sampled multiple is M, it is described by when
The auxiliary synchronous reception signal in domain filters by frequency overlapped-resistable filter, it is then down-sampled obtain it is down-sampled after time domain auxiliary synchronous receive letter
Number, it is specially：The auxiliary synchronous reception signal of time domain is passed through into LfIndividual delayer, mN is taken in m-th of clockm+ t delayers it is defeated
Go out and Lf-mNm- t delayer output results are added, the value after addition and mNm+ t filter coefficientsIt is multiplied, and
Afterwards by NmIndividual multiplied result is added to obtain the filter result in m-th of clock, then the filter result of M clock is added up, you can
Obtain filtering it is down-sampled after the auxiliary synchronous reception signal of time domain, wherein Nm=Lf/ 2M is multiplier number, and m span is 0
To M-1, t span is 1 to arrive Nm.Synchronous reception signal auxiliary to time domain is then down-sampled by frequency overlapped-resistable filter filtering,
The length of follow-up FFT can be reduced and reduce the complexity of follow-up difference related operation, so as to which whole inspection be greatly reduced
Survey the implementation complexity of module.
Further, the auxiliary synchronous reception signal of the 3rd step frequency domain and auxiliary synchronous signals copy sequence after frequency domain scrambling
Sequence in group makes the difference split-phase pass and specifically included：First by the sequence of the auxiliary synchronous reception signal odd term element composition of frequency domain
With the sequence of even item element compositionConjugate multiplicationWherein ()*To take conjugate operation；Again will conjugation
Multiplied result sequenceSequence odd term element group in auxiliary synchronous signals copy sequence group after successively being scrambled with frequency domain
Into the sequence target sequence t (k) that is multiplied to the end with the sequence that even item element forms；Finally by two models for seeking t (k)
Number obtains correlation corr (k).
Further, final correlation is obtained by way of the multiple incoherent merging of correlation result in the 3rd step
Value, it is specially：Assuming that the pth time auxiliary synchronous reception signal of frequency domain and the sequence in auxiliary synchronous signals copy sequence group after frequency domain scrambling
It is corr to make the difference split-phase and close acquisition correlationp(k) multiple correlation, is passed through into incoherent merging
Obtain final correlation corrsum(k), wherein P is merging number.
Final correlation is obtained by way of the multiple incoherent merging of correlation result, auxiliary synchronous signals can be improved
Detection performance.Because the auxiliary synchronous signals that system is sent per frame are all identical, therefore the diversity gain for sending signal can be utilized,
Influence of the amplitude to correlation during reducing channel deep fading.
Beneficial effect：The present invention proposes a kind of LTE system downlink auxiliary synchronous signals detection for realizing low complex degree
It method, can be realized with relatively low implementation complexity, and while computation complexity is not increased, significantly improve the descending chain of LTE system
The Differential Detection performance of road auxiliary synchronous signals.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description only show the present invention one
A little embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these
Accompanying drawing obtains the accompanying drawing of other embodiment.
Fig. 1 is LTE system structured flowchart used by the embodiment of the present invention.
A kind of LTE system downlink auxiliary synchronous signals for realizing low complex degree that Fig. 2 is provided by the embodiment of the present invention
Block diagram is embodied in detection method.
Fig. 3 by the embodiment of the present invention using anti-aliasing filter with it is down-sampled combine realize structured flowchart.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, clear, complete description is carried out to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only this
Invention part of the embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art exist
The every other embodiment obtained under the premise of creative work is not made, should all belong to the scope of protection of the invention.
Assuming that one includes NTRoot transmission antenna and NRThe LTE system of root reception antenna, its system block diagram are as shown in Figure 1.
LTE system regulation frequency domain auxiliary synchronous signals length is 62 points, 64 subcarriers in band occupancy center.By frequency on every transmission antenna
Frequency-region signal on 64 subcarriers with center, converted by resource impact and IFFT, form the time domain that length is N points and send
Data, then by addition cyclic prefix (Cyclic Prefix, CP) and parallel-serial conversion, be sent to afterwards in wireless channel.Only
CP length is needed to be more than the length of time domain channel response, you can to eliminate the intersymbol interference (Inter brought by multipath channel
Symbol Interference, ISI).It is all to determine to synchronize signal detection after signal is received first for receiving terminal
Such as timing and frequency synchronizing information, detect broadcast channel again afterwards and obtain the essential informations such as system bandwidth, System Frame Number, finally
Other data channels are detected again.
Receiver is decided synchronization signal detection first when detecting synchronizing signal, then does auxiliary synchronous signals detection again.It is false
If master sync signal detects successfully, then the symbol timing information of system is it has been determined that according to primary synchronization channel and auxiliary synchronization channel
Relative position, time domain auxiliary synchronous signals data can be got.In order that those skilled in the art more fully understand this hair
Bright scheme, a kind of LTE system downlink auxiliary synchronous signals for realizing low complex degree that the embodiment of the present invention is provided detect
The specific implementation of method is summarized as the structured flowchart shown in Fig. 2.Mainly comprise the following steps：
(1) first by the auxiliary synchronous reception signal of time domain by frequency overlapped-resistable filter filter, it is then down-sampled obtain it is down-sampled
The auxiliary synchronous reception signal of time domain afterwards.
Assuming that the auxiliary synchronous reception signal of time domain on jth root reception antenna is rj(n), frequency overlapped-resistable filter time domain response is
F (n), filter length Lf, then the auxiliary synchronous reception signal of time domain after being filtered is
Wherein, * is convolution operator, and M is down-sampled multiple, and general value is 2 multiple.Frequency overlapped-resistable filter is typically adopted
Realized with FIR filter, its filter coefficient Central Symmetry；And down-sampled operation then continuously exports without signal.It is more than consideration
Feature, anti-aliasing filter is combined realization and to optimize realize structure with down-sampled, the visible Fig. 3 of concrete implementation structured flowchart.It is defeated
Enter signal and pass through LfIndividual delayer, mN is taken in m-th of clockmThe output of+t delayers and N-mNm- t delayer outputs
Results added, value and mN after additionm+ t filter coefficientsIt is multiplied, then by NmIndividual multiplied result is added to obtain
Filter result in m clock, then the filter result of M clock is added up, finally give it is down-sampled after output
In formulaFor the coefficient of wave filter, Nm=Lf/ 2M is the number of required multiplier, needs L with Conventional filtersf
Individual multiplier is compared, and resource consumption is greatly decreased.
(2) the auxiliary synchronous reception signal of time domain after will be down-sampled does FFT and obtains the auxiliary synchronous reception signal of frequency domain.Drop is adopted
The auxiliary synchronous reception signal of 64 points of time domain can be obtained after sample operation, the auxiliary synchronous reception signal of frequency domain is obtained by FFT
(3) sequence in auxiliary synchronous signals copy sequence group after the auxiliary synchronous reception signal of frequency domain and frequency domain scrambling is done into difference
Related operation obtains correlation.
Assuming that the equivalent auxiliary synchronization channel frequency domain response between more transmission antennas and jth root reception antenna isThen
The auxiliary synchronous reception signal of frequency domainIt is as follows with the relation of the auxiliary synchronous transmission signal d (k) of frequency domain after scrambling
Wherein wj(k) it is the frequency domain equivalent noise on jth root reception antenna.
Assuming that the coherence bandwidth of channel is more than frequency bandwidth shared by two subcarriers on frequency domain, therefore phase can be approximately considered
Adjacent subcarrier auxiliary synchronization channel value is equal, namelyBy the frequency domain on jth root reception antenna
Auxiliary synchronous reception signal makes the difference split-phase pass with auxiliary synchronous signals copy sequence after native scrambling, you can obtains jth root reception antenna
Detection judgement amount
D in formula(q)(k) it is auxiliary synchronous signals copy sequence after q-th of frequency domain scrambling, the auxiliary synchronous reception signal of 64 frequency domains
Effective length is 62 points, therefore the length of difference correlation is 31.Because system one shares 168 small district's groups, and each small district's groups
The auxiliary synchronous signals sent in the 0th subframe and the 5th subframe are different, therefore copy sequence number is 336 altogether.Above-mentioned difference
Split-phase is closed and eliminates influence of the channel phase to correlation result, thus this method have under frequency-selective channel environment compared with
Strong robustness.Additionally due to the auxiliary synchronous reception signal conjugate multiplication of frequency domain, causes received signal to noise ratio by certain loss.
Write formula (4) as matrix form, and by the incoherent merging of the judgement amount of more reception antennas, obtain total detection
Judgement amount is
In formula,Respectively jth root
The sequence of the auxiliary synchronous reception signal odd elements of reception antenna frequency domain and even element composition, d(q,odd)And d(q,even)Respectively
The sequence of auxiliary synchronous signals copy sequence odd term element and even item element composition after q frequency domain scrambling, ()HExpression takes altogether
Yoke transposition.Choose parameters of the q for causing above formula judgement amount maximum as estimation
(4) last basisValue determine small the district's groups ID and system frame timing information of system.Small district's groups id informationWith q
Relation it is as follows：
Wherein, mod is complementation computing.System frame timing information can be byTo determine：As m=0, system is
0th subframe, and system is the 5th subframe as m=1.
When seeking judgement amount J (q) in formula (5), the mode of the incoherent merging of multi-difference correlation result can be taken, profit
Diversity gain is sent with system, improves the detection performance of auxiliary synchronous signals.During in view of the 0th subframe of system with the 5th subframe
When the auxiliary synchronous signals that send and differ, therefore need staggeredly to merge when merging
In formula, J(p)(q) the related correlation of pth time difference is represented, P is the frame number merged.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (4)
1. a kind of descending auxiliary synchronous signals detection method of LTE system for realizing low complex degree, it is characterised in that this method includes：
The first step, by the auxiliary synchronous reception signal of time domain by frequency overlapped-resistable filter filter, it is then down-sampled obtain it is down-sampled after
The auxiliary synchronous reception signal of time domain；Wherein, frequency overlapped-resistable filter uses LfThe realization of rank FIR filter, filter coefficient Central Symmetry ai
=aN-i, i=1,2 ..., Lf/ 2-1, the output of wave filter is down-sampled by M times again, obtain it is down-sampled after output；Specifically
For：
The auxiliary synchronous reception signal of time domain is passed through into LfIndividual delayer, mN is taken in m-th of clockmThe output of+t delayers and the
Lf-mNm- t delayer output results are added, the value after addition and mNm+ t filter coefficientsIt is multiplied, then by Nm
Individual multiplied result is added to obtain the filter result in m-th of clock, then the filter result of M clock is added up, you can is filtered
The auxiliary synchronous reception signal of time domain after ripple is down-sampled, wherein Nm=Lf/ 2M is multiplier number, and m span arrives M-1, t for 0
Span be 1 to arrive Nm；
Second step, will be down-sampled after the auxiliary synchronous reception signal of time domain do FFT to obtain the auxiliary synchronous reception signal of frequency domain；
3rd step, the sequence in auxiliary synchronous signals copy sequence group after the auxiliary synchronous reception signal of frequency domain and frequency domain scrambling is done into difference
Related operation is to obtain correlation；
4th step, choose and cause the index of sequence in auxiliary synchronous signals copy sequence group that correlation is maximum to estimate small district's groups ID
Information and system frame timing information.
2. a kind of descending auxiliary synchronous signals detection method of LTE system for realizing low complex degree according to claim 1, it is special
Sign is, the auxiliary synchronous reception signal of the 3rd step frequency domain and the sequence in auxiliary synchronous signals copy sequence group after frequency domain scrambling
Split-phase pass is made the difference to specifically include：First by the sequence of the auxiliary synchronous reception signal odd term element composition of frequency domainWith even item member
The sequence of element compositionConjugate multiplicationWherein ()*To take conjugate operation；Again by conjugate multiplication result
SequenceThe sequence that sequence odd term element forms in auxiliary synchronous signals copy sequence group after successively being scrambled with frequency domain
The target sequence t (k) for being multiplied to the end with the sequence of even item element composition；Phase is obtained finally by t (k) two norms are sought
Pass value corr (k).
A kind of 3. LTE system downlink auxiliary synchronous signals detection for realizing low complex degree according to claim 2
Method, it is characterised in that obtained in the 3rd step by way of the multiple incoherent merging of correlation result final
Correlation, it is specially：Assuming that after the pth time auxiliary synchronous reception signal of frequency domain and frequency domain scrambling in auxiliary synchronous signals copy sequence group
It is corr that sequence, which makes the difference split-phase and closes the correlation obtained,p(k), then multiple correlation is passed through into incoherent mergingObtain final correlation corrsum(k), wherein P is merging number.
4. a kind of descending auxiliary synchronous signals detection method of LTE system for realizing low complex degree according to claim 1, it is special
Sign is the medium and small district's groups id information of the 4th stepSystem frame timing information byTo determine：Work as m=0
When, system is the 0th subframe, and system is the 5th subframe as m=1, and wherein G is small district's groups sum, and q is and frequency domain is auxiliary synchronously connects
Receive the call number of sequence in the maximum auxiliary synchronous signals copy sequence group of signal correlation values.
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| CN106470179B (en) * | 2015-08-21 | 2019-08-09 | 展讯通信（上海）有限公司 | Mobile terminal uplink signal generation method and device |
| KR102559804B1 (en) * | 2016-09-20 | 2023-07-26 | 삼성전자주식회사 | Method and apparatus for detecting synchronization signal |
| CN108075807B (en) * | 2016-11-10 | 2020-08-14 | 电信科学技术研究院 | Cell identifier detection method and device |
| CN109428847B (en) * | 2017-08-29 | 2021-03-26 | 苏州优尼赛信息科技有限公司 | Method and device for detecting and synchronizing downlink subsynchronous signals in NB-IoT system |
| CN108964865B (en) * | 2018-08-24 | 2022-02-22 | 锐迪科（重庆）微电子科技有限公司 | Terminal receiving method and device |
| CN112448906B (en) * | 2020-10-12 | 2022-03-29 | 华南理工大学 | Communication receiver architecture and communication receiving method for separation detection joint judgment |
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