CN106341159B - A kind of wireless pilot signals searching method and system - Google Patents
A kind of wireless pilot signals searching method and system Download PDFInfo
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- CN106341159B CN106341159B CN201610720110.4A CN201610720110A CN106341159B CN 106341159 B CN106341159 B CN 106341159B CN 201610720110 A CN201610720110 A CN 201610720110A CN 106341159 B CN106341159 B CN 106341159B
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Abstract
The invention discloses a kind of wireless pilot signals searching method and systems, which comprises sampled signal sliding step in setting search process is indicated, K >=2 with K；According to the sliding step of setting, pilot signal is scanned for, the search plan and serial hybrid pilot search plan that the search plan for not increasing correlation length can be used, increase correlation length；The search plan of correlation length is not increased for the coarse search of stronger pilot tone and the coarse search of all pilot frequency intensities, the search plan of correlation length is increased for the coarse search of stronger pilot tone and the coarse search of all pilot frequency intensities, serial hybrid pilot search plan is based on the search plan realization for increasing correlation length, and for the essence search of most strong/stronger pilot tone, the search of all pilot frequency intensity essences and specified PN is biased and the search of search window.The present invention can be effectively reduced operand using bigger signal sliding step is arranged for situation computationally intensive during mobile terminal device downlink pilot search.
Description
Technical field
The present invention relates to a kind of wireless pilot signals searching method and systems, belong to mobile communication technology field.
Background technique
With the development of mobile communication technology, application content such as voice, short message and data transmission etc. are more and more deep
Into people's lives and work, become a part indispensable in various fields.
In mobile communication system, the service of access to communication networks generally is provided for mobile terminal device by base station.For side
Just mobile terminal device accessing mobile communication network, (3rd-Generation, the 3rd generation mobile communication technology) base station 3G can weeks
Phase property underground hair band has the pilot signal of own characteristic, and mobile terminal device finds mobile radio communication by searching for these signals
Best serving BS is in network to carry out the activities such as user's registration, voice communication, data interaction, i.e., mobile terminal device for
The search for the wireless pilot signals that base station issues is the indispensable process to obtain service.
Wireless pilot signals are searched for, the most difficult situation is that the priori of base station pilot is not yet obtained in mobile terminal device
Information or the base station pilot information of preservation and not applicable situation, mobile terminal device is needed by frequency point, by code word at this time
It scans for, undoubtedly needs to spend many costs.
In digital communication systems, generally, good signal-to-noise ratio is obtained to approach optimum sampling point, needs to dock
The aerial signal of receipts carries out over-sampling, this can further increase the operand of search for pilots.Even in known candidate frequency point and
In the case where code word, search for pilots can also become the not small burden of system.
Chinese Authorization Notice No. is the patent of invention of CN1210879C, gives CDMA (Code Division
Multiple Access, CDMA) method that search window is divided into in search for pilots small search window, it can increase fast
Speed searches the probability of pilot tone, but can not reduce the operand of search for pilots.
Chinese Authorization Notice No. is the patent of invention of CN1178411C, is given in 8 times of oversampled signals feelings of CDMA signal
Under condition, 4 times of first progress carries out the merging of pilot search and multipath signal using only 2 times of oversampled signals after extracting, to drop
Low operand, but this scheme, are defined so as to strictly the multiple of signal sampling rate.
In addition, in a communications system, initial pilot search is not required for strictly searching strongest pilot, searched as long as meeting
Rope to the Signal to Interference plus Noise Ratio of pilot tone reach stronger horizontal；Alternatively, searching for and faintly estimating different base station pilot tone function
The relative size of rate.At this point, high operand caused by higher over-sampling multiple is used to bring corresponding system gain and unknown
Aobvious, i.e., input-output ratio is not high.
Therefore, a kind of method that can reduce the operand in pilot search process is urgently needed, can be used in simultaneously
Under a variety of pilot search scenes and it will not reduce or be substantially reduced the performance of pilot search.
Summary of the invention
The purpose of the present invention is to solve problem of the prior art, provide a kind of wireless pilot signals searching method,
This method is slided for situation computationally intensive during mobile terminal device downlink pilot search using bigger signal is arranged
Step-length can be effectively reduced operand.
Another object of the present invention is to provide a kind of wireless pilot signals search systems.
The purpose of the present invention can be reached by adopting the following technical scheme that:
A kind of wireless pilot signals searching method, which comprises
Sampled signal sliding step in search process is set；Wherein, the sliding step is indicated with K, K >=2；
According to the sliding step of setting, pilot signal is scanned for.
As a preferred embodiment, the sliding step according to setting, scans for pilot signal, using not increasing
The search plan of correlation length, comprising:
The correlation length that aerial signal and local sequence is arranged is L0, it is THR that judgement, which captures the thresholding of pilot tone,0, and assume
The object search of pilot signal is a segment signal of memory block；
This K number of K-1 is arrived for 0, sets an order as the i value in pilot search process；Wherein, the order of setting
For the sequence or bit-reversed of odd number after natural number sequence, natural number inverted order, first even number；
To signal sequence { xn| n=0,1,2 ..., N-1 progress initial signal be xi, sliding length K, correlation length be
L0Sliding pilot search, until taking-up initial signal value number be greater than N-1- (L0-1)M；Wherein, signal sequence { xn|n
=0,1,2 ..., N-1 the starting point set of i-th of phase sequence be combined into { xn| n=i, i+K, i+2K ..., i+NK), 0≤i≤
K-1,M is the over-sampling multiple in communication system；
The decision parameter that signal correlation obtains if it exists is not less than threshold T HR0, then it is judged to searching pilot signal,
Pilot search is exported as a result, and terminating entire pilot search process；Wherein, pilot search result includes the signal starting point of pilot tone
Position and pilot tone characteristic；
If the decision parameter that signal correlation obtains fails to reach threshold T HR0, then determine to fail in i-th of phase sequence
Pilot signal is searched, signal sequence { x is carried outn| n=0,1,2 ..., N-1 next phase sequence pilot search；
After searching for the signal of all phase sequences, still fails to search pilot tone, then terminate this search.
Further, described to signal sequence { xn| n=0,1,2 ..., N-1 progress initial signal be xi, sliding length be
K, correlation length is L0Sliding pilot search, until taking-up initial signal value number be greater than N-1- (L0- 1) the step of M
In, when the object search of pilot signal is the data of flowing, signal sequence { xn| n=0,1,2 ..., N-1 i-th of phase
The starting point set of sequence becomes { xn| n=W+i, W+i+K, W+i+2K ..., W+i+NK)；Wherein, 0≤i≤K-1, W M, i
Order value and pilot signal period number of chips product,
As a preferred embodiment, the sliding step according to setting, scans for pilot signal, using increasing phase
The search plan of customs director's degree, comprising:
The correlation length that aerial signal and local sequence is arranged is A*L0, it is THR that judgement, which captures the thresholding of pilot tone,1, and it is false
The object search for determining pilot signal is a segment signal of memory block；Wherein, 1 < A < K；
This K number of K-1 is arrived for 0, sets an order as the i value in pilot search process；Wherein, the order of setting
For the sequence or bit-reversed of odd number after natural number sequence, natural number inverted order, first even number；
To signal sequence { xn| n=0,1,2 ..., N+ML0(A-1) carry out initial signal -1 } is xi, sliding length K,
Correlation length is A*L0Sliding pilot search, until taking-up first signal value number be greater than N-1- (L0-1)M；Wherein,
M is the over-sampling multiple in communication system；
The decision parameter that signal correlation obtains if it exists is not less than threshold T HR1, then it is judged to searching pilot signal,
Pilot search is exported as a result, and terminating entire pilot search process；Wherein, pilot search result includes the signal starting point of pilot tone
Position and pilot tone characteristic；
If the decision parameter that signal correlation obtains fails to reach threshold T HR1, then determine to fail in i-th of phase sequence
Pilot signal is searched, signal sequence { x is carried outn| n=0,1,2 ..., N+ML0(A-1) pilot tone of next phase sequence -1 }
Search；
After searching for the signal of all phase sequences, still fails to search pilot tone, then terminate this search.
As a preferred embodiment, the sliding step according to setting, scans for pilot signal, using based on plus
The serial hybrid pilot search plan that the search plan of big correlation length is realized, comprising:
The correlation length that aerial signal and local sequence is arranged is A*L0, it is THR that judgement, which captures the thresholding of pilot tone,1, and it is false
The object search for determining pilot signal is a segment signal of memory block；Wherein, 1 < A < K；
This K number of K-1 is arrived for 0, sets an order as the i value in pilot search process；Wherein, the order of setting
For the sequence or bit-reversed of odd number after natural number sequence, natural number inverted order, first even number；
For the signal sequence { x of inputn| n=0,1,2 ..., N+ML0(A-1) -1 }, it is divided into Liang Ge branch, first branch
The signal on road, directly carries out the search plan for increasing correlation length, and the signal of second branch postpones τ sampling point of Δ；Wherein,
Δ τ indicates the corresponding number of samples of maximum multipath delay empirical value of present channel；Wherein, M is the over-sampling times in communication system
Number；
It obtains in first branch not less than threshold T HR1Correlation after, interruption of work, at the same be second branch
Road provides enable signal；Wherein, interruption of work time span is τ sampling point of Δ corresponding time；
After second branch receives enable signal, multipath is searched within the time of τ sampling point of 2* Δ later, that is, is existed
Start the Multipath searching module of corresponding pilot tone in each τ sampling point of Δ in front and back centered on the signal location for searching pilot tone, and
Provide pilot search result；Wherein, the correlation length of the Multipath searching module in second branch is L0, signal sliding step be
1 sampling point, threshold value THR2, wherein THR2For the threshold value in pilot signal multipath search process.
Another object of the present invention can be reached by adopting the following technical scheme that:
A kind of wireless pilot signals search system, the system comprises:
Sliding step setup module, for sampled signal sliding step in search process to be arranged；Wherein, the sliding step
It is indicated with K, K >=2；
Search module scans for pilot signal for the sliding step according to setting.
Preferably, described search module is using the search plan for not increasing correlation length, comprising:
First correlation length setting unit, the correlation length for aerial signal and local sequence to be arranged is L0, determine to catch
The thresholding for receiving pilot tone is THR0, and assume that the object search of pilot signal is a segment signal of memory block；
First order setup unit sets an order as in pilot search process for arriving this K number of K-1 for 0
I value；Wherein, the order set as natural number sequence, natural number inverted order, first even number after odd number sequence or bit-reversed；
First sliding pilot searching unit, for signal sequence { xn| n=0,1,2 ..., N-1 carry out initial signal be
xi, sliding length K, correlation length L0Sliding pilot search, until taking-up initial signal value number be greater than N-1-
(L0-1)M；Wherein, signal sequence { xn| n=0,1,2 ..., N-1 the starting point set of i-th of phase sequence be combined into { xn| n=
i,i+K,i+2K,…,i+NK), 0≤i≤K-1,M is the over-sampling multiple in communication system；
First judging unit is not less than threshold T HR for the decision parameter that signal correlation obtains if it exists0, then determine
To search pilot signal, pilot search is exported as a result, and terminating entire pilot search process；Wherein, pilot search result packet
Include the signal initial point position and pilot tone characteristic of pilot tone；
Second judging unit, if failing to reach threshold T HR for the decision parameter that signal correlation obtains0, then determine i-th
Fail to search pilot signal in a phase sequence, carries out signal sequence { xn| n=0,1,2 ..., N-1 next phase sequence
The pilot search of column；
First terminates search unit, searches pilot tone for still failing after searching for the signal of all phase sequences, then
Terminate this search.
Further, in the first sliding pilot searching unit, when the data that the object search of pilot signal is flowing
When, signal sequence { xn| n=0,1,2 ..., N-1 the starting point set of i-th of phase sequence become { xn| n=W+i, W+i+
K,W+i+2K,…,W+i+NK)}；Wherein, 0≤i≤K-1, the product of W M, the order value of i and pilot signal period number of chips,
Preferably, described search module is using the search plan for increasing correlation length, comprising:
Second correlation length setting unit, the correlation length for aerial signal and local sequence to be arranged is A*L0, determine
The thresholding for capturing pilot tone is THR1, and assume that the object search of pilot signal is a segment signal of memory block；Wherein, 1 < A < K；
Second order setup unit sets an order as in pilot search process for arriving this K number of K-1 for 0
I value；Wherein, the order set as natural number sequence, natural number inverted order, first even number after odd number sequence or bit-reversed；
Second sliding pilot searching unit, for signal sequence { xn| n=0,1,2 ..., N+ML0(A-1) progress -1 }
Initial signal is xi, sliding length K, correlation length A*L0Sliding pilot search, until first signal value of taking-up
Number is greater than N-1- (L0-1)M；Wherein, M is the over-sampling multiple in communication system；
Third judging unit is not less than threshold T HR for the decision parameter that signal correlation obtains if it exists1, then determine
To search pilot signal, pilot search is exported as a result, and terminating entire pilot search process；Wherein, pilot search result packet
Include the signal initial point position and pilot tone characteristic of pilot tone；
4th judging unit, if failing to reach threshold T HR for the decision parameter that signal correlation obtains1, then determine i-th
Fail to search pilot signal in a phase sequence, carries out signal sequence { xn| n=0,1,2 ..., N+ML0(A-1) -1 } next
The pilot search of a phase sequence；
Second terminates search unit, searches pilot tone for still failing after searching for the signal of all phase sequences, then
Terminate this search.
Preferably, described search module uses the serial hybrid pilot realized based on the search plan for increasing correlation length
Search plan, comprising:
Third setting unit, the correlation length for aerial signal and local sequence to be arranged is A*L0, judgement, which captures, to be led
The thresholding of frequency is THR1, and assume that the object search of pilot signal is a segment signal of memory block；Wherein, 1 < A < K；
Third setup unit sets an order as the i in pilot search process for arriving this K number of K-1 for 0
Value；Wherein, the order set as natural number sequence, natural number inverted order, first even number after odd number sequence or bit-reversed；
Branch units, for the signal sequence { x for inputn| n=0,1,2 ..., N+ML0(A-1) -1 }, it is divided into two
Branch, the signal of first branch directly carry out the search plan for increasing correlation length, and the signal of second branch postpones Δ τ
A sampling point；Wherein, Δ τ indicates the corresponding number of samples of maximum multipath delay empirical value of present channel；Wherein, M is communication system
In over-sampling multiple；
Enable signal provides unit, for obtaining in first branch not less than threshold T HR1Correlation after, in
Disconnected work, while enable signal is provided for second branch；Wherein, when interruption of work time span is that τ sampling point of Δ is corresponding
Between；
Multipath searching unit, for after second branch receives enable signal, τ sampling point of 2* Δ later when
Interior search multipath starts corresponding pilot tone that is, before and after centered on searching the signal location of pilot tone in τ sampling point of each Δ
Multipath searching module, and provide pilot search result；Wherein, the correlation length of the Multipath searching module in second branch is
L0, signal sliding step be 1 sampling point, threshold value THR2, wherein THR2For the thresholding in pilot signal multipath search process
Value.
The present invention have compared with the existing technology it is following the utility model has the advantages that
1, wireless pilot signals searching method of the invention and system are directed to mobile terminal device downlink pilot search process
In computationally intensive situation, by the way that biggish initial ranging step-length is arranged, (step-length K >=2, the step-length of the prior art are 1), to reduce
Calculation amount when search for pilots, search plan can be using not increasing the search plan of correlation length, increase correlation length
Search plan and serial hybrid pilot search plan.
2, the search plan for not increasing correlation length in wireless pilot signals searching method of the invention and system, is believing
It makes an uproar in situation more preferable than (SNR), can directly reduce the calculation amount of search for pilots；In the case where noise is poor, pass through
To the traversal search of out of phase signal, effect same as the prior art may finally be obtained, it is seen that reduce and search in pilot tone
That average computational load in rope stage, suitable for the coarse search of stronger pilot tone and the coarse search of all pilot frequency intensities.
3, the search plan of wireless pilot signals searching method of the invention and the increasing correlation length in system, even
The correlation length during pilot signal searches is increased, due to the increase of sliding step, final the amount of calculation is still can
It is control, reduction, it is equally applicable to the coarse search of stronger pilot tone and the coarse search of all pilot frequency intensities.
4, the serial hybrid pilot search plan in wireless pilot signals searching method of the invention and system, is to add
It is carried out on the basis of the search plan of big correlation length, does not find search sliding step when pilot signal by controlling, it can
Essence search, all pilot frequency intensities to reduce operand when precise search pilot multipath information, suitable for most strong/stronger pilot tone
The search of essence search and specified PN biasing and search window.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
A part of the embodiment to those skilled in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the wireless pilot signals searching method flow chart of the embodiment of the present invention 1.
Fig. 2 is in the wireless pilot signals searching method of the embodiment of the present invention 1 using the searcher for not increasing correlation length
Case flow chart.
Fig. 3 is in the wireless pilot signals searching method of the embodiment of the present invention 1 using the search plan for increasing correlation length
Flow chart.
Fig. 4 is that serial hybrid pilot search plan is used in the wireless pilot signals searching method of the embodiment of the present invention 1
Flow chart.
Fig. 5 is base station and mobile terminal device schematic diagram in 2 Cellular Networks of the embodiment of the present invention；
Fig. 6 is that the propagation time delay of the pilot signal arrival mobile terminal device of 2 different base station of the embodiment of the present invention is shown
It is intended to；
Fig. 7 is the initial signal number figure for the out of phase signal that the embodiment of the present invention 2 is extracted by storing data；
The number figure of initial signal when Fig. 8 is pilot tone correlation in the data flow of the embodiment of the present invention 2；
Fig. 9 is that the serial hybrid pilot of the embodiment of the present invention 2 searches for block diagram.
Figure 10 is the wireless pilot signals search system structural block diagram of the embodiment of the present invention 3.
Figure 11 is the structural block diagram of search module in the wireless pilot signals search system of the embodiment of the present invention 3.
Figure 12 is the structural block diagram of search module in the wireless pilot signals search system of the embodiment of the present invention 4.
Figure 13 is the structural block diagram of search module in the wireless pilot signals search system of the embodiment of the present invention 5.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments, based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Embodiment 1:
In mobile communication system such as CDMA2000, (Code Division Multiple Access 2000, code point are more
Location), (Time Division-Synchronous Code Division Multiple Access, time-division-are same by TD-SCDMA
Walk CDMA) or WCDMA (Wideband Code Division Multiple Access, wideband code division multiple access) in, respectively
A base station is sent out with itself specific pilot frequency information, is moved easily terminal device and is searched for these pilot frequency informations and is followed by networking
Network.In the pilot search process of these communication standard mobile terminal devices, generally aerial signal can be subjected to over-sampling, then
Oversampled signals are carried out to carry out related operation by sampling point sliding and local sequence, to obtain the optimum sampling point signal approached.
In existing technical solution, the scheme for carrying out related operation with local sequence by sampling point sliding is carried out to aerial signal
In, over-sampling multiple is bigger, and the effect for approaching optimum sampling point signal of acquisition is better, and still, mobile terminal device search is led
The operand of frequency is also bigger.
Assuming that existing signal sequence is { xn| n=0,1,2 ..., N-1 }, it is M times of mistake of signal digital baseband basic rate
Sample baseband signal.In by sampling point sliding pilot search scheme, i.e., sliding step is 1 sampling point, it is assumed that the phase customs director of setting
Degree is L0(L0> 0), the time window length of search for pilots is N number of sampling point, and it is THR that judgement, which captures the thresholding of pilot tone,0, wherein this
The type of a threshold value can for aerial signal and the related modulus value of local sequence, correlation modulus value square, related coefficient, noise
Than or the parameters such as Signal to Interference plus Noise Ratio.
As shown in Figure 1, a kind of wireless pilot signals searching method is present embodiments provided, method includes the following steps:
Sampled signal sliding step in S101, setting search process, the sliding step indicate that K >=2 increase here with K
Oversampled signals sliding step (sliding step of the prior art is 1) in search process, can reduce search for pilots process
In operand；
S102, the sliding step according to setting, scan for pilot signal.
In step s 102, if scanning for pilot signal using the search plan for not increasing correlation length, such as Fig. 2 institute
Show, specifically include:
The correlation length of S201, setting aerial signal and local sequence are L0, it is THR that judgement, which captures the thresholding of pilot tone,0,
And assume that the object search of pilot signal is a segment signal of memory block；
S202, this K number of K-1 is arrived for 0, sets an order as the i value in pilot search process；Wherein, it sets
Order be odd number after natural number sequence, natural number inverted order, first even number sequence or bit-reversed；
S203, to signal sequence { xn| n=0,1,2 ..., N-1 progress initial signal be xi, sliding length K, Xiang Guanchang
Degree is L0Sliding pilot search, until taking-up initial signal value number be greater than N-1- (L0-1)M；
For convenience of explanation, the present embodiment is by signal sequence { xn| n=0,1,2 ..., N-1 first time signal be embodied as
{xn| n=i, i+M, i+2M ..., i+ (L0- 1) M }, kth time signal be embodied as { xn| n=(k-1) * K+ [i, i+M, i+2M ..., i
+(L0- 1) M] }, corresponding sequence is known as i-th of phase sequence；
Wherein, signal sequence { xn| n=0,1,2 ..., N-1 the starting point set of i-th of phase sequence be combined into { xn| n=
i,i+K,i+2K,…,i+NK), 0≤i≤K-1,M is the over-sampling multiple in communication system；
Derivation process it is as follows:
The last one waits for the N in the number of the last one sampling point of correlated series when order accessKFor s times: the i+sK+ (L of K0-
1) M≤N-1, thus sK≤N-1-i- (L0-1)M；Wherein:(as quotient is rounded downwards), finally
When the object search of pilot signal is the data of flowing, signal sequence { xn| n=0,1,2 ..., N-1 i-th
The starting point set of a phase sequence becomes { xn| n=W+i, W+i+K, W+i+2K ..., W+i+NK)}；Wherein, 0≤i≤K-1, W
For the order value of M, i and the product of pilot signal period number of chips, W is a deviant, it is to change, and is had with the number of search
It closes,
S204, the decision parameter that signal correlation is obtained and threshold T HR0It is compared, signal correlation obtains if it exists
Decision parameter be not less than (being greater than or equal to) threshold T HR0, it is judged to searching pilot signal, enters step S205, it is no
Then, i.e., the decision parameter that signal correlation obtains fails to reach and (be less than) threshold T HR0, determine to fail to search in i-th of phase sequence
Rope enters step S206 to pilot signal；
S205, output pilot search as a result, and terminate entire pilot search process, the operand of search for pilots is than existing at this time
Some is small by sampling point slip scan scheme；Wherein, pilot search result includes the signal initial point position of pilot tone, pilot tone characteristic
Deng；
S206, judge whether to search for the signal of all phase sequences, if it is not, carrying out signal sequence { xn| n=0,1,
2 ..., N-1 } next phase sequence pilot search, return step S203；If, that is to say, that searched for all phases
After the signal of sequence, still fail to search pilot tone, then terminate this search, at this time the operand of search for pilots and existing by sample
Point slip scan scheme is consistent, return step S201, resets search parameter, carries out the pilot search of a new round.
In step s 102, if scanning for pilot signal using the search plan for increasing correlation length, such as Fig. 3 institute
Show, specifically include:
The correlation length of S301, setting aerial signal and local sequence are A*L0, determine that the thresholding for capturing pilot tone is
THR1, and assume that the object search of pilot signal is a segment signal of memory block；Wherein, 1 < A < K, with correlation length L0, threshold value
The factors such as classification, desired empty inspection and false dismissal probability are related, by empirical value or can be derived from；
S302, this K number of K-1 is arrived for 0, sets an order as the i value in pilot search process；Wherein, it sets
Order be odd number after natural number sequence, natural number inverted order, first even number sequence or bit-reversed；
S303, to signal sequence { xn| n=0,1,2 ..., N+ML0(A-1) -1 } progress initial signal is xi, sliding length
For K, correlation length A*L0Sliding pilot search, until taking-up first signal value number be greater than N-1- (L0-1)M；
Wherein, M is the over-sampling multiple in communication system；
S304, the decision parameter that signal correlation is obtained and threshold T HR1It is compared, signal correlation obtains if it exists
Decision parameter be not less than (being greater than or equal to) threshold T HR1, it is judged to searching pilot signal, enters step S305, it is no
Then, i.e., the decision parameter that signal correlation obtains fails to reach and (be less than) threshold T HR1, determine to fail to search in i-th of phase sequence
Rope enters step S306 to pilot signal；
S305, output pilot search as a result, and terminate entire pilot search process, the operand of search for pilots is than existing at this time
Some is small by sampling point slip scan scheme；Wherein, pilot search result includes the signal initial point position of pilot tone, pilot tone characteristic
Deng；
S306, judge whether to search for the signal of all phase sequences, if it is not, carrying out signal sequence { xn| n=0,1,
2,…,N+ML0(A-1) pilot search of next phase sequence -1 }, return step S303；If, that is to say, that it searched for
After the signal of all phase sequences, still fail to search pilot tone, then terminate this search, the operand of search for pilots is than existing at this time
Some is small by sampling point slip scan scheme, return step S301, resets search parameter, carries out the pilot search of a new round.
In a step 102, it is searched for according to the serial hybrid pilot realized based on the search plan for increasing correlation length
Scheme, as shown in figure 4, specifically including:
The correlation length of S401, setting aerial signal and local sequence are A*L0, determine that the thresholding for capturing pilot tone is
THR1, and assume that the object search of pilot signal is a segment signal of memory block；Wherein, 1 < A < K；
S402, this K number of K-1 is arrived for 0, sets an order as the i value in pilot search process；Wherein, it sets
Order be odd number after natural number sequence, natural number inverted order, first even number sequence or bit-reversed；
S403, the signal sequence { x for inputn| n=0,1,2 ..., N+ML0(A-1) -1 }, it is divided into Liang Ge branch, first
The signal of a branch, directly carries out the search plan for increasing correlation length, and the signal of second branch postpones τ sampling point of Δ；Its
In, Δ τ indicates the corresponding number of samples of maximum multipath delay empirical value of present channel；Wherein, M is the over-sampling in communication system
Multiple；
S404, it obtains in first branch not less than threshold T HR1Correlation after, interruption of work, at the same be second
A branch provides enable signal；Wherein, interruption of work time span is τ sampling point of Δ corresponding time；
S405, after second branch receives enable signal, within the time of τ sampling point of 2* Δ later search for it is more
Diameter starts the Multipath searching of corresponding pilot tone that is, before and after centered on searching the signal location of pilot tone in τ sampling point of each Δ
Module, and provide pilot search result；Wherein, the Multipath searching module in second branch is to be searched using the multipath of the prior art
Rope module, correlation length L0, signal sliding step be 1 sampling point, threshold value THR2, wherein THR2For pilot signal multipath
Threshold value in search process.
Embodiment 2:
The present embodiment is specific application example, by taking the pilot search of CDMA2000 as an example.
As described in Figure 5, Cellular Networks are composed of the regular hexagon 503 that many base station 501a are covered, in base station 501a or
In the overlay area of base station 501b, multiple mobile terminal devices 502 can be accommodated.
When mobile terminal device 502 attempts access to mobile network, needs to search for it and receive most leading by force in aerial signal
Frequency signal.Generally, mobile terminal device 502 receives that the pilot signal power of nearest base station 501b is most strong or matter
It measures best, but inevitably, can also receive the pilot signal of the base station around the 501b of base station.Mobile terminal device is
Close to cell edge, the quality of the pilot signal for other base stations that can detecte is better.Even, received farther base
The pilot signal of 501a of standing is also detectable.
Different cdma base stations has different pilot tone characteristics, is mainly reflected in that working frequency points and PN (pseudo noise code) are inclined
It sets, the present embodiment only discusses the pilot signal of the different base station under same working frequency points.
The short PN sequence of cdma system is that have the pseudo-random sequence of good autocorrelation performance, and the period is 32768 chips,
Spreading rate is 1.2288Mc/s.Fig. 6 is that the propagation time delay of the pilot signal arrival mobile terminal device of different base station is shown
It is intended to, first base station 601 and second base station 602 (603 be base station receiver) of these work in same working frequency points,
The pilot signal of transmission has different PN biasings 604 and 605；In addition different base station to mobile terminal device transmission delay not
With different with the transmission multipath of each base station to mobile terminal device, mobile terminal device from receiving end to aerial signal in can be with
Search out the copy 606,607,608 and 609 of the different delays of PN sequence.Mobile terminal device is biased by searching different PN
Pilot signal, to access different base stations.
Generally, a part of the PN sequence of 0 biasing can be used such as starting in the pilot search of cdma system
1024 chips are as locally associated sequence, come to the aerial signal over-sampling sequence { x receivedn| n=0,1,2 ..., N-1 } into
Row pilot search, wherein the multiple of over-sampling is 4, i.e. 4.9152Msample/s, and the time window of pilot search is one short
The PN sequence period corresponding period, i.e., since sometime, until postponing in the 32768 chips corresponding time, local sequence
Column carry out related operation with 4 times of down-sampled signals for receiving oversampled signals, by relevant result and preset threshold T HR0
It is compared, whether contains copy identical with local sequence in signal therefore, it is determined that receiving；Pilot tone relevant search each time
Later, the step-length for receiving signal sliding sampling point is 1, successively calculates and receives in signal sequence with the presence or absence of identical with local sequence
Copy, therefore, it is determined that whether with the presence of pilot tone in this period.
In order to reduce the operand during search for pilots, it is sliding that the present embodiment increases the oversampled signals in search process
Dynamic step-length, is set as 3, the scheme of search for pilots is divided into three kinds: not increasing the search plan of correlation length, increases correlation length
Search plan and serial hybrid pilot search plan, the present embodiment set the value of K as 3, and the value of correlation length is 1024, M's
Value is 4.
One, the search of correlation length is not increased
The correlation length that aerial signal and local sequence is arranged is 1024 chips, determines that the thresholding for capturing pilot tone is
THR0, and assume that the object search of pilot signal is a segment signal of memory block；
As shown in fig. 7, the 701 ({ x of signal sequence formed to sampled point 702n| n=0,1,2 ..., N-1) i-th of phase
Bit sequence carry out sliding step be 3, the sliding pilot search that correlation length is 1024, until the volume of first signal value of taking-up
Number be greater than N-1-1023*4；Wherein the starting point set of i-th of phase sequence is combined into { xn| n=i, i+3, i6 ..., i+N3)}(0≤i
≤ 2), whereinElement in the starting point set 603 of i.e. the 0th phase sequence is 0,3,6
Deng element in the starting point set 604 of the 1st phase sequence is the starting point set 605 of 1,4,7 etc., the 2nd phase sequences
In element be 2,5,8 etc.；
The decision parameter that signal correlation obtains if it exists is not less than threshold T HR0, then it is judged to searching pilot signal,
Output obtain pilot tone signal initial point position and the pilot search such as pilot tone characteristic as a result, and terminate entire pilot search process,
The operand of search for pilots is smaller by sampling point slip scan scheme than existing at this time；
If the decision parameter that signal correlation obtains fails to reach threshold T HR0, then determine in this i-th of phase sequence not
Pilot signal can be searched, signal sequence { x is carried outn| n=0,1,2 ..., N-1 next phase sequence pilot search；
After searching for the signal of all phase sequences, still fails to search pilot tone, then terminate this search, search at this time
The operand of pilot tone with it is existing consistent by sampling point slip scan scheme.
Then, search parameter is reset, the pilot search of a new round is carried out.
When the object search of pilot signal is the data of flowing, i-th of phase sequence of signal sequence is (it is assumed that i is corresponding
Sequence valve be that starting point set 2) becomes: { xn| n=W+i, W+i+3, W+i+6 ..., W+i+N3) (0≤i≤2) wherein W
=32768*4*2=262144,As shown in figure 8, the 0th phase sequence set
In 801, the relevant initial signal 803 of each pilot tone is the integral multiple for being 3 at a distance from the starting point for receiving signal with this
Sampling point (802 be search time), and with other sampling points 804 for the signal sequence of starting point, then it not will do it pilot search；1st
A phase sequence set 805, the 2nd phase sequence set 806 is similarly.
Do not increase the search plan of correlation length is applicable in scene: the coarse search of stronger pilot tone, all pilot frequency intensities it is thick
Search；Wherein, the threshold value when coarse search of stronger pilot tone needs to exceed the threshold value when coarse search of all pilot frequency intensities.
Two, the search of correlation length is increased
The correlation length that aerial signal and local sequence is arranged is 1.5*1024, determines that the thresholding for capturing pilot tone is
THR1。
For 0 to 2 this 3 numbers, arbitrarily take a value as the i value of pilot search process；
To signal sequence { xn| n=0,1,2 ..., N+2047 i-th of phase sequence carry out sliding length be 3, it is related
The sliding pilot search that length is 1536；
The decision parameter obtained if there is signal correlation is not less than threshold T HR1, then it is judged to searching pilot tone letter
Number, output obtains the pilot search such as signal initial point position and the pilot tone characteristic of pilot tone as a result, and terminating entire pilot search mistake
Journey, the operand of search for pilots is smaller by sampling point slip scan scheme than existing at this time；
If the decision parameter that signal correlation obtains fails to reach threshold T HR1, then determine in this i-th of phase sequence
Fail to search pilot signal, and then determines in entire signal sequence { xn| n=0,1,2 ..., N+2047 in fail to search
Pilot tone then terminates this search, and the operand of search for pilots is smaller by sampling point slip scan scheme than existing at this time.
Then, search parameter is reset, the pilot search of a new round is carried out.
Increase the search plan of correlation length is applicable in scene: the coarse search of stronger pilot tone, the thick of all pilot frequency intensities are searched
Rope；Wherein, the threshold value when coarse search of stronger pilot tone needs to exceed the threshold value when coarse search of all pilot frequency intensities.
Three, serial Hybrid Search scheme
On the basis of increasing the search plan of correlation length, serial hybrid pilot search is carried out, can be obtained fine
Pilot search result:
As shown in figure 9, for the 901 ({ x of signal sequence of inputn| n=0,1,2 ..., N+2047 }), it is divided into two points
Branch: the signal of first branch directly carries out the search plan for increasing correlation length, is completed by the first pilot searcher 902,
In, the first pilot searcher 902 is the pilot searcher in the search plan using above-mentioned increasing correlation length；Second branch
Signal, postpone τ sampling point of Δ 903, wherein Δ τ indicates that the maximum multipath of present channel postpones the corresponding number of samples of empirical value.
It obtains in first branch not less than threshold T HR1Correlation after, first branch can with interruption of work,
Enable signal 904 is provided for second branch simultaneously, wherein interruption of work time span is τ sampling point of Δ corresponding time；The
After two branches receive enable signal 904, multipath is searched within the time of τ sampling point of 2* Δ later, i.e., to search
Start the second pilot searcher 905 of corresponding pilot tone in front and back τ sampling point of each Δ centered on the signal location of pilot tone, and provides
Pilot search result 906.Wherein pilot searcher 2 is using the module of the pilot search of the prior art, correlation length L0, letter
Number sliding step is 1 sampling point, threshold value THR2, wherein THR2For the threshold value in pilot signal multipath search process.
Serial Hybrid Search scheme is applicable in scene: the essence search of most strong/stronger pilot tone, all pilot frequency intensity essences are searched
Rope, specified PN is biased and the search of search window.
The search plan for being applicable in scene and increasing correlation length of the above-mentioned search plan for not increasing correlation length is applicable in
Scene is divided into following five scenes:
A, the coarse search of stronger pilot tone:
It finds out in communication system compared with one or several in strong waveguide frequency signal, wherein the stronger weighing criteria of pilot signal
It is larger for signal-to-noise ratio or Signal to Interference plus Noise Ratio.The coarse search of stronger pilot tone the result is that provide the corresponding position of the stronger diameter of pilot signal,
Precision reaches chip rank, can be with relatively probably after mobile terminal device searches for multipath near this position, multipath signal merges
Rate demodulates corresponding cell information.
B, the essence search of most strong/stronger pilot tone:
Most strong and stronger pilot signal is found out in communication system, wherein pilot signal is most strong or stronger weighing criteria is
Signal-to-noise ratio or the dry maximum or bigger of making an uproar of letter.The essence search of most strong/stronger pilot tone the result is that providing most strong or stronger pilot tone most
The strong corresponding position of diameter, precision reach sampling point rank, and mobile terminal device searches for multipath near this position, multipath signal merges
After can demodulate corresponding cell information with maximum or greater probability.
C, the coarse search of all pilot frequency intensities:
In the case where keeping average calculating operation amount minimum, the pilot signal that can be detected in communication system is found out, for critical
Detectable weak pilot signal can have the omission of certain probability, wherein pilot signal can detect weighing criteria be signal-to-noise ratio or
Signal to Interference plus Noise Ratio is greater than the threshold value of setting.The coarse search of all pilot frequency intensities the result is that providing the stronger diameter pair of all pilot signals
The position answered, precision reach chip rank, and mobile terminal device can learn the information such as the cell number being closer.
D, the essence search of all pilot frequency intensities:
Find out in communication system can be detected pilot signal, wherein pilot signal can detect weighing criteria be signal-to-noise ratio or
Signal to Interference plus Noise Ratio is greater than the threshold value of setting.All pilot frequency intensities essence search the result is that providing all pilot signal most powerful paths pair
The position answered, precision reach sampling point rank, and mobile terminal device can learn the information such as neighbouring cell number.
E, the search of PN biasing and search window is specified:
In the case where the downstream message of system specifies the size cases of PN (pseudo noise code) information and search window, signal in the sky
In find out intensity and the position of this pilot signal.Specified PN biasing and the search of search window are the result is that provide specified pilot tone letter
The exact position of number most powerful path, precision reach sampling point rank, and mobile terminal device is that the operations such as possible handover are prepared.
Embodiment 3:
As shown in Figure 10, a kind of wireless pilot signals search system is present embodiments provided, which includes following functions
Module:
Sliding step setup module 1001, for sampled signal sliding step in search process to be arranged；Wherein, the sliding
Step-length indicates with K, K >=2；
Search module 1002 scans for pilot signal for the sliding step according to setting.
In the present embodiment, search module 1002 is using the search plan for not increasing correlation length, as shown in figure 11, packet
It includes:
First correlation length setting unit 1101, the correlation length for aerial signal and local sequence to be arranged is L0, sentence
Surely the thresholding for capturing pilot tone is THR0, and assume that the object search of pilot signal is a segment signal of memory block；
First order setup unit 1102 sets an order as pilot search mistake for arriving this K number of K-1 for 0
I value in journey；Wherein, the order set as natural number sequence, natural number inverted order, first even number after odd number sequence or bit-reversed；
First sliding pilot searching unit 1103, for signal sequence { xn| n=0,1,2 ..., N-1 } initially believed
Number be xi, sliding length K, correlation length L0Sliding pilot search, until taking-up initial signal value number be greater than N-
1-(L0-1)M；Wherein, signal sequence { xn| n=0,1,2 ..., N-1 the starting point set of i-th of phase sequence be combined into { xn|n
=i, i+K, i+2K ..., i+NK), 0≤i≤K-1,M is the over-sampling times in communication system
Number；
In the first sliding pilot searching unit 1103, when the object search of pilot signal is the data of flowing, letter
Number sequence { xn| n=0,1,2 ..., N-1 the starting point set of i-th of phase sequence become { xn| n=W+i, W+i+K, W+i+
2K,…,W+i+NK)}；Wherein, 0≤i≤K-1, the product of W M, the order value of i and pilot signal period number of chips,
First judging unit 1104 is not less than threshold T HR for the decision parameter that signal correlation obtains if it exists0, then
It is judged to searching pilot signal, exports pilot search as a result, and terminating entire pilot search process；Wherein, pilot search knot
Fruit includes the signal initial point position and pilot tone characteristic of pilot tone；
Second judging unit 1105, if failing to reach threshold T HR for the decision parameter that signal correlation obtains0, then sentence
Fail to search pilot signal in fixed i-th of phase sequence, carries out signal sequence { xn| n=0,1,2 ..., N-1 it is next
The pilot search of phase sequence；
First terminates search unit 1106, leads for still failing to search after searching for the signal of all phase sequences
Frequently, then terminate this search.
Embodiment 4:
The present embodiment is also provided that a kind of wireless pilot signals search system, is with the difference place of embodiment 3:
Described search module 1002 is using the search plan for increasing correlation length, as shown in figure 12, comprising:
Second correlation length setting unit 1201, the correlation length for aerial signal and local sequence to be arranged is A*L0,
It is THR that judgement, which captures the thresholding of pilot tone,1, and assume that the object search of pilot signal is a segment signal of memory block；Wherein, 1 <
A<K；
Second order setup unit 1202 sets an order as pilot search mistake for arriving this K number of K-1 for 0
I value in journey；Wherein, the order set as natural number sequence, natural number inverted order, first even number after odd number sequence or bit-reversed；
Second sliding pilot searching unit 1203, for signal sequence { xn| n=0,1,2 ..., N+ML0(A-1) -1 }
Progress initial signal is xi, sliding length K, correlation length A*L0Sliding pilot search, until first signal of taking-up
The number of value is greater than N-1- (L0-1)M；Wherein, M is the over-sampling multiple in communication system；
Third judging unit 1204 is not less than threshold T HR for the decision parameter that signal correlation obtains if it exists1, then
It is judged to searching pilot signal, exports pilot search as a result, and terminating entire pilot search process；Wherein, pilot search knot
Fruit includes the signal initial point position and pilot tone characteristic of pilot tone；
4th judging unit 1205, if failing to reach threshold T HR for the decision parameter that signal correlation obtains1, then sentence
Fail to search pilot signal in fixed i-th of phase sequence, carries out signal sequence { xn| n=0,1,2 ..., N+ML0(A-1)-1}
Next phase sequence pilot search；
Second terminates search unit 1206, leads for still failing to search after searching for the signal of all phase sequences
Frequently, then terminate this search.
Embodiment 5:
The present embodiment is also provided that a kind of wireless pilot signals search system, is with the difference place of embodiment 4:
Described search module 1002 is using the serial hybrid pilot search plan realized based on the search plan for increasing correlation length, such as
Shown in Figure 13, comprising:
Third setting unit 1301, the correlation length for aerial signal and local sequence to be arranged is A*L0, determine capture
Thresholding to pilot tone is THR1, and assume that the object search of pilot signal is a segment signal of memory block；Wherein, 1 < A < K；
Third setup unit 1302 sets an order as in pilot search process for arriving this K number of K-1 for 0
I value；Wherein, the order set as natural number sequence, natural number inverted order, first even number after odd number sequence or bit-reversed；
Branch units 1303, for the signal sequence { x for inputn| n=0,1,2 ..., N+ML0(A-1) -1 }, it is divided into
Liang Ge branch, the signal of first branch directly carry out the search plan for increasing correlation length, and the signal of second branch prolongs
τ sampling point of slow Δ；Wherein, Δ τ indicates the corresponding number of samples of maximum multipath delay empirical value of present channel；Wherein, M is communication
Over-sampling multiple in system；
Enable signal provides unit 1304, for obtaining in first branch not less than threshold T HR1Correlation
Afterwards, interruption of work, while enable signal is provided for second branch；Wherein, interruption of work time span is that τ sampling point of Δ is corresponding
Time；
Multipath searching unit 1305, for after second branch receives enable signal, in τ sampling point of 2* Δ later
Time in search for multipath, i.e., before and after centered on searching the signal location of pilot tone in τ sampling point of each Δ starting correspondence
The Multipath searching module of pilot tone, and provide pilot search result；Wherein, the phase customs director of the Multipath searching module in second branch
Degree is L0, signal sliding step be 1 sampling point, threshold value THR2, wherein THR2For the door in pilot signal multipath search process
Limit value.
It should be noted that system provided by the above embodiment is only illustrated with the division of above-mentioned each functional module
Illustrate, in practical applications, can according to need and be completed by different functional modules above-mentioned function distribution, i.e., by internal junction
Structure is divided into different functional modules, to complete all or part of the functions described above.In addition, described in the present embodiment
Mobile terminal device can be mobile phone, e-book, PDA, human-computer interaction terminal or other handheld terminals having a display function
Equipment.
Those of ordinary skill in the art will appreciate that all or part of the steps in realization the various embodiments described above method is can
It is completed with instructing relevant hardware by program, corresponding program can store in a computer-readable storage medium
In, the storage medium, such as ROM/RAM, disk or CD.
In conclusion wireless pilot signals searching method of the invention and system are searched for mobile terminal device descending pilot frequency
Computationally intensive situation during rope, by the way that biggish initial ranging step-length is arranged, (step-length of step-length K >=2, the prior art is
1) calculation amount when search for pilots, is reduced, search plan can be using search plan, the increasing correlation for not increasing correlation length
The search plan of length and serial hybrid pilot search plan.
The above, only the invention patent preferred embodiment, but the scope of protection of the patent of the present invention is not limited to
This, anyone skilled in the art is in the range disclosed in the invention patent, according to the present invention the skill of patent
Art scheme and its patent of invention design are subject to equivalent substitution or change, belong to the scope of protection of the patent of the present invention.
Claims (8)
1. a kind of wireless pilot signals searching method, it is characterised in that: the described method includes:
Sampled signal sliding step in search process is set；Wherein, the sliding step is indicated with K, K >=2；
According to the sliding step of setting, pilot signal is scanned for；
The sliding step according to setting, scans for pilot signal, using the search plan for not increasing correlation length, packet
It includes:
The correlation length that aerial signal and local sequence is arranged is L0, it is THR that judgement, which captures the thresholding of pilot tone,0, and assume pilot tone
The object search of signal is a segment signal of memory block；
This K number of K-1 is arrived for 0, sets an order as the i value in pilot search process；Wherein, the order set is certainly
The sequence or bit-reversed of odd number after right number sequence, natural number inverted order, first even number；
To signal sequence { xn| n=0,1,2 ..., N-1 } progress initial signal be xi, sliding length K, correlation length L0's
Pilot search is slided, until the number of the initial signal value of taking-up is greater than N-1- (L0-1)M；Wherein, signal sequence { xn| n=0,
1,2 ..., N-1 } the starting point set of i-th of phase sequence be combined into { xn| n=i, i+K, i+2K ..., i+NK), 0≤i≤K-1,M is the over-sampling multiple in communication system；
The decision parameter that signal correlation obtains if it exists is not less than threshold T HR0, then it is judged to searching pilot signal, output is led
Frequency search result, and terminate entire pilot search process；Wherein, pilot search result include pilot tone signal initial point position and
Pilot tone characteristic；
If the decision parameter that signal correlation obtains fails to reach threshold T HR0, then determine to fail to search in i-th of phase sequence
Pilot signal carries out signal sequence { xn| n=0,1,2 ..., N-1 } next phase sequence pilot search；
After searching for the signal of all phase sequences, still fails to search pilot tone, then terminate this search.
2. a kind of wireless pilot signals searching method according to claim 1, it is characterised in that: described to signal sequence { xn
| n=0,1,2 ..., N-1 } progress initial signal be xi, sliding length K, correlation length L0Sliding pilot search, until
The number of the initial signal value of taking-up is greater than N-1- (L0- 1) in the step of M, when the number that the object search of pilot signal is flowing
According to when, signal sequence { xn| n=0,1,2 ..., N-1 } the starting point set of i-th of phase sequence become { xn| n=W+i, W+i
+ K, W+i+2K ..., W+i+NK)}；Wherein, 0≤i≤K-1, the product of W M, the order value of i and pilot signal period number of chips,
3. a kind of wireless pilot signals searching method, it is characterised in that: the described method includes:
Sampled signal sliding step in search process is set；Wherein, the sliding step is indicated with K, K >=2；
According to the sliding step of setting, pilot signal is scanned for；
The sliding step according to setting, scans for pilot signal, using the search plan for increasing correlation length, packet
It includes:
The correlation length that aerial signal and local sequence is arranged is A*L0, it is THR that judgement, which captures the thresholding of pilot tone,1, and assume to lead
The object search of frequency signal is a segment signal of memory block；Wherein, 1 < A < K；
This K number of K-1 is arrived for 0, sets an order as the i value in pilot search process；Wherein, the order set is certainly
The sequence or bit-reversed of odd number after right number sequence, natural number inverted order, first even number；
To signal sequence { xn| n=0,1,2 ..., N+ML0(A-1) -1 } progress initial signal is xi, sliding length K, Xiang Guanchang
Degree is A*L0Sliding pilot search, until taking-up first signal value number be greater than N-1- (L0-1)M；Wherein, M is logical
Over-sampling multiple in letter system；
The decision parameter that signal correlation obtains if it exists is not less than threshold T HR1, then it is judged to searching pilot signal, output is led
Frequency search result, and terminate entire pilot search process；Wherein, pilot search result include pilot tone signal initial point position and
Pilot tone characteristic；
If the decision parameter that signal correlation obtains fails to reach threshold T HR1, then determine to fail to search in i-th of phase sequence
Pilot signal carries out signal sequence { xn| n=0,1,2 ..., N+ML0(A-1) pilot search of next phase sequence -1 }；
After searching for the signal of all phase sequences, still fails to search pilot tone, then terminate this search.
4. a kind of wireless pilot signals searching method, it is characterised in that: the described method includes:
Sampled signal sliding step in search process is set；Wherein, the sliding step is indicated with K, K >=2；
According to the sliding step of setting, pilot signal is scanned for；
The sliding step according to setting, scans for pilot signal, using based on the search plan for increasing correlation length
The serial hybrid pilot search plan realized, comprising:
The correlation length that aerial signal and local sequence is arranged is A*L0, it is THR that judgement, which captures the thresholding of pilot tone,1, and assume to lead
The object search of frequency signal is a segment signal of memory block；Wherein, 1 < A < K；
This K number of K-1 is arrived for 0, sets an order as the i value in pilot search process；Wherein, the order set is certainly
The sequence or bit-reversed of odd number after right number sequence, natural number inverted order, first even number；
For the signal sequence { x of inputn| n=0,1,2 ..., N+ML0(A-1) -1 }, it is divided into Liang Ge branch, first branch
Signal directly carries out the search plan for increasing correlation length, to signal sequence { xn| n=0,1,2 ..., N+ML0(A-1) -1 } into
Row initial signal is xi, sliding length K, correlation length A*L0Sliding pilot search, until first signal value of taking-up
Number be greater than N-1- (L0-1)M；The signal of second branch postpones τ sampling point of Δ；Wherein, Δ τ indicates present channel most
The corresponding number of samples of multipath delay empirical value；Wherein, M is the over-sampling multiple in communication system；
It obtains in first branch not less than threshold T HR1Correlation after, interruption of work, while being provided for second branch
Enable signal；Wherein, interruption of work time span is τ sampling point of Δ corresponding time；
After second branch receives enable signal, multipath is searched within the time of τ sampling point of 2* Δ later, i.e., to search
Start the Multipath searching module of corresponding pilot tone in front and back τ sampling point of each Δ centered on rope to the signal location of pilot tone, and provides
Pilot search result；Wherein, the correlation length of the Multipath searching module in second branch is L0, signal sliding step be 1
Sampling point, threshold value THR2, wherein THR2For the threshold value in pilot signal multipath search process.
5. a kind of wireless pilot signals search system, it is characterised in that: the system comprises:
Sampled signal sliding step in search process is arranged in sliding step setup module；Wherein, the sliding step is indicated with K,
K≥2；
Search module scans for pilot signal for the sliding step according to setting；
Described search module is using the search plan for not increasing correlation length, comprising:
First correlation length setting unit, the correlation length for aerial signal and local sequence to be arranged is L0, judgement, which captures, to be led
The thresholding of frequency is THR0, and assume that the object search of pilot signal is a segment signal of memory block；
First order setup unit sets an order as the i in pilot search process for arriving this K number of K-1 for 0
Value；Wherein, the order set as natural number sequence, natural number inverted order, first even number after odd number sequence or bit-reversed；
First sliding pilot searching unit, for signal sequence { xn| n=0,1,2 ..., N-1 } progress initial signal be xi, it is sliding
Dynamic length is K, correlation length L0Sliding pilot search, until taking-up initial signal value number be greater than N-1- (L0-1)
M；Wherein, signal sequence { xn| n=0,1,2 ..., N-1 } the starting point set of i-th of phase sequence be combined into { xn| n=i, i+K, i
+ 2K ..., i+NK), 0≤i≤K-1,M is the over-sampling multiple in communication system；
First judging unit is not less than threshold T HR for the decision parameter that signal correlation obtains if it exists0, then it is judged to searching for
To pilot signal, pilot search is exported as a result, and terminating entire pilot search process；Wherein, pilot search result includes pilot tone
Signal initial point position and pilot tone characteristic；
Second judging unit, if failing to reach threshold T HR for the decision parameter that signal correlation obtains0, then determine i-th of phase
Fail to search pilot signal in bit sequence, carries out signal sequence { xn| n=0,1,2 ..., N-1 } next phase sequence
Pilot search；
First terminates search unit, searches pilot tone for still failing after searching for the signal of all phase sequences, then terminates
This search.
6. a kind of wireless pilot signals search system according to claim 5, it is characterised in that: the first sliding pilot tone
In search unit, when the object search of pilot signal is the data of flowing, signal sequence { xn| the of n=0,1,2 ..., N-1
The starting point set of i phase sequence becomes xnn=W+i, W+i+K, W+i+2K ..., W+i+NK；Wherein, 0≤i≤K-1, W are
M, the product of the order value of i and pilot signal period number of chips,
7. a kind of wireless pilot signals search system, it is characterised in that: the system comprises:
Sampled signal sliding step in search process is arranged in sliding step setup module；Wherein, the sliding step is indicated with K,
K≥2；
Search module scans for pilot signal for the sliding step according to setting；
Described search module is using the search plan for increasing correlation length, comprising:
Second correlation length setting unit, the correlation length for aerial signal and local sequence to be arranged is A*L0, determine to capture
The thresholding of pilot tone is THR1, and assume that the object search of pilot signal is a segment signal of memory block；Wherein, 1 < A < K；
Second order setup unit sets an order as the i in pilot search process for arriving this K number of K-1 for 0
Value；Wherein, the order set as natural number sequence, natural number inverted order, first even number after odd number sequence or bit-reversed；
Second sliding pilot searching unit, for signal sequence { xn| n=0,1,2 ..., N+ML0(A-1) -1 } initially believed
Number be xi, sliding length K, correlation length A*L0Sliding pilot search, until the number of first signal value of taking-up is big
In N-1- (L0-1)M；Wherein, M is the over-sampling multiple in communication system；
Third judging unit is not less than threshold T HR for the decision parameter that signal correlation obtains if it exists1, then it is judged to searching for
To pilot signal, pilot search is exported as a result, and terminating entire pilot search process；Wherein, pilot search result includes pilot tone
Signal initial point position and pilot tone characteristic；
4th judging unit, if failing to reach threshold T HR for the decision parameter that signal correlation obtains1, then determine i-th of phase
Fail to search pilot signal in bit sequence, carries out signal sequence { xn| n=0,1,2 ..., N+ML0(A-1) next phase -1 }
The pilot search of bit sequence；
Second terminates search unit, searches pilot tone for still failing after searching for the signal of all phase sequences, then terminates
This search.
8. a kind of wireless pilot signals search system, it is characterised in that: the system comprises:
Sampled signal sliding step in search process is arranged in sliding step setup module；Wherein, the sliding step is indicated with K,
K≥2；
Search module scans for pilot signal for the sliding step according to setting；
Described search module uses the serial hybrid pilot search plan realized based on the search plan for increasing correlation length, packet
It includes:
Third setting unit, the correlation length for aerial signal and local sequence to be arranged is A*L0, determine the door for capturing pilot tone
It is limited to THR1, and assume that the object search of pilot signal is a segment signal of memory block；Wherein, 1 < A < K；
Third setup unit sets an order as the i value in pilot search process for arriving this K number of K-1 for 0；Its
In, the order that sets as natural number sequence, natural number inverted order, first even number after odd number sequence or bit-reversed；
Branch units, for the signal sequence { x for inputn| n=0,1,2 ..., N+ML0(A-1) -1 }, it is divided into Liang Ge branch,
The signal of first branch directly carries out the search plan for increasing correlation length, to signal sequence { xn| n=0,1,2 ..., N+
ML0(A-1) -1 } progress initial signal is xi, sliding length K, correlation length A*L0Sliding pilot search, until take out
First signal value number be greater than N-1- (L0-1)M；The signal of second branch postpones τ sampling point of Δ；Wherein, Δ τ table
Show the corresponding number of samples of maximum multipath delay empirical value of present channel；Wherein, M is the over-sampling multiple in communication system；
Enable signal provides unit, for obtaining in first branch not less than threshold T HR1Correlation after, interrupt work
Make, while providing enable signal for second branch；Wherein, interruption of work time span is τ sampling point of Δ corresponding time；
Multipath searching unit, for after second branch receives enable signal, within the time of τ sampling point of 2* Δ later
Multipath is searched for, i.e., starts the more of corresponding pilot tone in τ sampling point of each Δ before and after centered on searching the signal location of pilot tone
Path search module, and provide pilot search result；Wherein, the correlation length of the Multipath searching module in second branch is L0、
Signal sliding step is 1 sampling point, threshold value THR2, wherein THR2For the threshold value in pilot signal multipath search process.
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| US7272126B2 (en) * | 2005-04-07 | 2007-09-18 | Pctel, Inc. | Method and apparatus for beacon discovery in a spread spectrum cellular radio communication system |
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| CN1418410A (en) * | 2000-11-17 | 2003-05-14 | 皇家菲利浦电子有限公司 | Pilot signal search method with decimation reordering in CDMA system |
| CN101068126A (en) * | 2007-05-24 | 2007-11-07 | 中兴通讯股份有限公司 | Peak value searching method and device used for code division multiple access |
| CN101499845A (en) * | 2008-01-29 | 2009-08-05 | 大唐移动通信设备有限公司 | Uplink synchronous detection method and apparatus for TD-SCDMA system |
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