CN104284414B - The frequency synchronization method and device of a kind of cell searching - Google Patents
The frequency synchronization method and device of a kind of cell searching Download PDFInfo
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- CN104284414B CN104284414B CN201410601957.1A CN201410601957A CN104284414B CN 104284414 B CN104284414 B CN 104284414B CN 201410601957 A CN201410601957 A CN 201410601957A CN 104284414 B CN104284414 B CN 104284414B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention provides the frequency synchronization method and device of a kind of cell searching, wherein, the described method includes：Piecemeal operation is carried out to the data in buffering area, obtains multiple data blocks, each data block includes N number of data, and N is positive integer；N number of data in the block to each data carry out bandpass filtering successively, and calculate the filtered power of each data block；When the bandpass filtering of M data block of completion, according to the general power before the M data block filtering for completing bandpass filtering and filtered general power, obtain completing the power ratio of M data block of bandpass filtering, M is the integer part of L/N, L is the channel length of preset data, and M and L are positive integer；Judge whether to detect preset data according to the power ratio of M data block；Preset data is the data of single-frequency；If detecting preset data, the Frequency Synchronization of cell searching is carried out using preset data.The present invention improves stability and the accuracy of the Frequency Synchronization of cell searching.
Description
Technical field
The present invention relates to field of communication technology, more particularly to the frequency synchronization method and device of a kind of cell searching.
Background technology
GSM (Global System for Mobile Communication, global system for mobile communications) is mobile logical
A kind of very extensive communication standard is used in letter.Channel in GSM includes control channel and Traffic Channel, and control channel includes
FCCH (Frequency Correction Channel, frequency correction channel), SCH (Synchronization Channel,
Synchronizing channel) and BCCH (Broadcast Control Channel, broadcast control channel) etc..By detecting FCCH exactly,
Local clock frequency can be synchronized to precise frequency on base station up by mobile terminal.
In gsm, MS (Mobile Station, mobile station) completes cell searching by demodulating FCCH and SCH, carries out small
It is resident to receive broadcast message from base station etc. in area.Correct capture FCCH is to realize time accurate synchronization to obtain the letter such as frame number
The premise of breath.
FCCH is by 148 0, by GMSK (Gaussian Filtered Minimum Shift Keying, Gauss filter
Ripple minimum shift keying) sine wave signal that is modulated into, and frequency is higher by carrier frequency 67.7KHz.FCCH is down-converted to
After base band, it is possible to regard the sine wave signal that single-frequency is 67.7KHz as.
At present, to FCCH capture main method have based on phase difference, based on amplitude difference to based on the related three major types of slip.
It is to search for a kind of method of FCCH using FCCH adjacent-symbols constant phase difference for the characteristics of pi/2 based on phase difference；Based on width
Degree difference is the characteristics of using FCCH be 37 sine waves after GMSK modulation, poor for 0 according to adjacent peaks, searches for one kind of FCCH
Method；And sliding correlation method is to utilize FCCH time domain sine waves, frequency domain has the characteristics that sharp unimodal feature to detect FCCH
A kind of method.
It is to signal procesing in time domain based on phase difference method and based on amplitude difference method, it is not necessary to carry out spectrum analysis, letter
Single practical but easily affected by noise, in the case of noise is bigger, penalty is serious.Based on slide correlation technique by
Influence of noise is smaller, but its performance drastically deteriorates in the case where local clock bias is more than 1KHz.
The content of the invention
The present invention provides a kind of frequency synchronization method and device of cell searching, to solve based on phase difference method and be based on
Amplitude difference method capture FCCH is affected by noise to cause penalty, and based on when sliding correlation technique capture FCCH in local
Clock jitter be more than 1KHZ in the case of penalty the problem of.
To solve the above-mentioned problems, the invention discloses a kind of frequency synchronization method of cell searching, including：
Piecemeal operation is carried out to the data in buffering area, obtains multiple data blocks, wherein, each data block includes N number of
Data, N are positive integer；
N number of data in the block to each data carry out bandpass filtering successively, and calculate the filtered power of each data block；
When the bandpass filtering of M data block of completion, according to the general power before the M data block filtering for completing bandpass filtering
With filtered general power, the power ratio of M data block of completion bandpass filtering is obtained, wherein, the M is the integer of L/N
Part, the L are the channel length of preset data, and M and L are positive integer；
Judge whether to detect the preset data according to the power ratio of the M data block；The preset data is
The data of single-frequency；
If detecting the preset data, the Frequency Synchronization of cell searching is carried out using the preset data.
Preferably, it is described when the bandpass filtering of M data block of completion, filtered according to M data block for completing bandpass filtering
The general power of wavefront and filtered general power, obtain completing the power ratio of M data block of bandpass filtering, including：
It is described when completing the bandpass filtering of M data block, the power before M data block for completing bandpass filtering is filtered
Added up the general power before being filtered, and the filtered power of M data block for completing bandpass filtering is added up to obtain
Filtered general power；
Filtered general power and the general power before filtering are divided by, obtain M data block of the completion bandpass filtering
Power ratio.
Preferably, the power ratio according to the M data block judges whether to detect the preset data, bag
Include：
The power ratio of the M data block is set as first minimum power ratio；
Judge next power ratio of the first minimum power ratio and the first minimum power ratio it
Whether difference is more than rising threshold value；Next power ratio is a for the M of next group of completion bandpass filtering of current M data block
The power ratio of data block；
When next power ratio of the first minimum power ratio and the difference of the first minimum power ratio
During more than the rising threshold value, judge whether the first minimum power ratio is more than peak value threshold；
When the first minimum power ratio is more than the peak value threshold, band logical filter is completed from multigroup M data block
Maximum power ratio is determined in multiple power ratios obtained from ripple, and judges the maximum power ratio and the maximum work
Whether the difference of next power ratio of rate ratio, which is more than, declines thresholding；
When the difference of the maximum power ratio and next power ratio of the maximum power ratio is more than the decline
During thresholding, judgement detects the preset data.
Preferably, the method further includes：
When next power ratio of the first minimum power ratio and the difference of the first minimum power ratio
During less than or equal to the rising threshold value, next power ratio of the first minimum power ratio is set as second minimum
Power ratio；
Continue to judge next power ratio of the second minimum power ratio and second minimum power ratio
Whether the difference of value is more than or equal to the rising threshold value, until next power ratio of the minimum power ratio of some setting and institute
The difference for stating the minimum power ratio of some setting is more than the rising threshold value.
Preferably, the method further includes：
When the first minimum power ratio is less than or equal to the peak value threshold, continue to judge first minimum
Whether next power ratio of power ratio is more than the peak value threshold, until some power ratio is more than the peak value door
Limit.
Preferably, the method further includes：
Described in being less than or equal to when the difference of the maximum power ratio and next power ratio of the maximum power ratio
When declining thresholding, continue to judge the maximum power ratio and the work(after next power ratio of the maximum power ratio
Whether the difference of rate ratio is more than the decline thresholding, until the difference of the maximum power ratio and some power ratio is more than the decline
Thresholding.
Correspondingly, the invention also discloses a kind of frequency synchronization device of cell searching, including：
Piecemeal module, for carrying out piecemeal operation to the data in buffering area, obtains multiple data blocks, wherein, per number
Include N number of data according to block, N is positive integer；
Filter module, for carrying out bandpass filtering successively to each data N number of data in the block, and calculates each data block
Filtered power；
Power ratio computing module, for when completing the bandpass filtering of M data block, according to the M of completion bandpass filtering
General power and filtered general power before a data block filtering, obtain completing the power ratio of M data block of bandpass filtering,
Wherein, the M is the integer part of L/N, and the L is the channel length of preset data, and M and L are positive integer；
Judgment module, for judging whether to detect the preset data according to the power ratio of the M data block；Institute
State the data that preset data is single-frequency；
Frequency synchronization module, if for detecting the preset data, cell searching is carried out using the preset data
Frequency Synchronization.
Preferably, the power ratio computing module, including：
Power adds up submodule, for when completing the bandpass filtering of M data block, will completion bandpass filtering M number
Power before being filtered according to block is added up filtered before general power, by complete bandpass filtering M data block it is filtered
Power is added up to obtain filtered general power；
Power is divided by submodule, for the general power before filtered general power and filtering to be divided by, obtains the completion
The power ratio of M data block of bandpass filtering.
Preferably, the judgment module, including：
Minimum power ratio sets submodule, for the power ratio of the M data block to be set as first minimum
Power ratio；
Rising threshold value judging submodule, for judging next power ratio and the institute of the first minimum power ratio
Whether the difference for stating first minimum power ratio is more than rising threshold value；Next power ratio is current M data block
The power ratio of M data block of next group of completion bandpass filtering；
Peak value threshold judging submodule, for when the first minimum power ratio next power ratio with it is described
When the difference of first minimum power ratio is more than the rising threshold value, judge whether the first minimum power ratio is more than peak
It is worth thresholding；
Decline thresholding judging submodule, for when the first minimum power ratio is more than the peak value threshold, from
Maximum power ratio is determined in multiple power ratios obtained from multigroup M data block completes bandpass filtering, and described in judgement
Whether the difference of next power ratio of maximum power ratio and the maximum power ratio, which is more than, declines thresholding；
Preset data judging submodule, for when next work(of the maximum power ratio and the maximum power ratio
When the difference of rate ratio is more than the decline thresholding, judgement detects the preset data.
Preferably, the minimum power ratio setting submodule, is additionally operable to work as under the first minimum power ratio
When one power ratio and the difference of the first minimum power ratio are less than or equal to the rising threshold value, described first of setting
Next power ratio of minimum power ratio is second minimum power ratio；
The rising threshold value judging submodule continues to judge next power ratio of the second minimum power ratio
And whether the difference of the second minimum power ratio is more than or equal to the rising threshold value, until the minimum power ratio of some setting
Next power ratio of value and the difference of the minimum power ratio of some setting are more than the rising threshold value.
Preferably, the peak value threshold judging submodule, is additionally operable to when the first minimum power ratio is less than or equal to
During the peak value threshold, continue to judge whether next power ratio of the first minimum power ratio is more than the peak value
Thresholding, until some power ratio is more than the peak value threshold.
Preferably, the decline thresholding judging submodule, is additionally operable to when the maximum power ratio and the maximum power
When the difference of next power ratio of ratio is less than or equal to the decline thresholding, continue to judge the maximum power ratio with it is described
Whether the difference of the power ratio after next power ratio of maximum power ratio is more than the decline thresholding, described in most
It is high-power than and the difference of some power ratio be more than the decline thresholding.
Compared with background technology, the present invention includes advantages below：
Piecemeal operation is carried out to the data in buffering area, obtains multiple data blocks, wherein, each data block includes N number of
Data, N are positive integer；N number of data in the block to each data carry out bandpass filtering successively, are used by carrying out bandpass filtering
Bandpass filter there is certain bandwidth, even if in the case that local clock frequency and carrier frequency offset reach 1KHZ, still
It so can accurately detect preset data, the Frequency Synchronization of cell searching is carried out using preset data, improves cell searching
The stability of Frequency Synchronization.
It is affected by noise small since preset data has the frequency characteristic of single-frequency, carried out using preset data small
The Frequency Synchronization of area searching, improves the accuracy of the Frequency Synchronization of cell searching.
Brief description of the drawings
Fig. 1 is a kind of frequency synchronization method flow chart of cell searching in the embodiment of the present invention one；
Fig. 2 is the front and rear schematic diagram for calculating data block power of bandpass filtering in the embodiment of the present invention one；
Fig. 3 is a kind of frequency synchronization method flow chart of cell searching in the embodiment of the present invention two；
Fig. 4 is the flow chart for judging whether to detect preset data in the embodiment of the present invention two；
Fig. 5 is the flow chart of the wait uphill process in the embodiment of the present invention two；
Fig. 6 is the flow chart of the wait peak value threshold process in the embodiment of the present invention two；
Fig. 7 is the flow chart of the wait decline process in the embodiment of the present invention two；
Fig. 8 is a kind of frequency synchronization method flow chart of cell searching in the embodiment of the present invention three；
Fig. 9 is a simulation comparison figure in the embodiment of the present invention three；
Figure 10 is another simulation comparison figure in the embodiment of the present invention three；
Figure 11 is a kind of frequency synchronization device structure chart of cell searching in the embodiment of the present invention four；
Figure 12 is a kind of frequency synchronization device structure chart of cell searching in the embodiment of the present invention five.
Embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Below by enumerate several specific embodiments be discussed in detail a kind of cell searching provided by the invention frequency it is same
One step process and device.
Embodiment one
A kind of frequency synchronization method of cell searching provided in an embodiment of the present invention is discussed in detail.
Reference Fig. 1, shows a kind of frequency synchronization method flow chart of cell searching in the embodiment of the present invention.
Step 100, piecemeal operation is carried out to the data in buffering area, obtains multiple data blocks.
Wherein, each data block includes N number of data, and N is positive integer.
The data that are received to buffering area carry out piecemeal operation, obtain multiple data blocks, the length of data block (including data
Number) the too long precision for influencing the technical program, it is too short, increase the calculation amount of the technical program, it is necessary to take one it is suitable
Value N.The value of N can be set according to actual conditions, and the present embodiment is not limited the specific value of N.
Step 102, N number of data in the block to each data carry out bandpass filtering successively, and calculate each data block filtering
Power afterwards.
According to the property that preset data is single-frequency, the band that each data data in the block are passed through into a smaller bandwidth
Bandpass filter, single-frequency of the bandpass filter passband central frequency in preset data.
When enter bandpass filter is preset data, preset data is located exactly in the passband of bandpass filter, in advance
If data are not lost substantially.
Step 104, when the bandpass filtering of M data block of completion, according to before the M data block filtering for completing bandpass filtering
General power and filtered general power, obtain completing the power ratio of M data block of bandpass filtering.
Wherein, the M is the integer part of L/N, and the L is the channel length of preset data, and M and L are positive integer.
Data block carry out bandpass filtering before calculate data block general power, can according to the general power after bandpass filtering with
General power before bandpass filtering obtains power ratio, as shown in Figure 2.When enter bandpass filter is preset data, power
Ratio be one close to 1 value；When enter bandpass filter is not preset data, power ratio is one and is less than 1 very
Small value.
Step 106, judge whether to detect the preset data according to the power ratio of the M data block.
Wherein, the preset data is the data of single-frequency.
It should be noted that need to use multiple power ratios in the present embodiment, not only using the power of M data block
Ratio, but multiple power ratios of multigroup M data block.
With the slip of data block in the band-pass filter, a series of power ratios can approximately form a parabola.Cause
M cumulative data block is progressed into for preset data, this process power ratio can be gradually increasing；When M cumulative data
When block is preset data, power ratio reaches maximum；When cumulative M data preset data in the block gradually decreases,
This process power ratio is gradually reduced, the approximate parabola of power ratio of whole process.
If detecting the preset data, step 108 is performed；If being not detected by the data, step 104 is re-executed,
Calculate next power ratio.
Step 108, the Frequency Synchronization of cell searching is carried out using the preset data.
The implementation procedure that the Frequency Synchronization of cell searching is carried out in the step 108 is referred to existing cell searching
Frequency Synchronization.
In conclusion the technical solution in the embodiment of the present invention is obtained by carrying out piecemeal operation to the data in buffering area
To multiple data blocks, wherein, each data block includes N number of data, and N is positive integer；N number of data in the block to each data according to
Secondary carry out bandpass filtering, the bandpass filter used in carrying out bandpass filtering has certain bandwidth, even if local clock
In the case that frequency and carrier frequency offset reach 1KHZ, remain able to accurately detect preset data, using preset data into
The Frequency Synchronization of row cell searching, improves the stability of the Frequency Synchronization of cell searching.
It is affected by noise small since preset data has the frequency characteristic of single-frequency, carried out using preset data small
The Frequency Synchronization of area searching, improves the accuracy of the Frequency Synchronization of cell searching.
Embodiment two
A kind of frequency synchronization method of cell searching provided in an embodiment of the present invention is discussed in detail.
Reference Fig. 3, shows a kind of frequency synchronization method flow chart of cell searching in the embodiment of the present invention.
Step 200, piecemeal operation is carried out to the data in buffering area, obtains multiple data blocks.
Wherein, each data block includes N number of data, and N is positive integer.
The data that are received to buffering area carry out piecemeal operation, obtain multiple data blocks, the length of data block (including data
Number) the too long precision for influencing the technical program, it is too short, increase the calculation amount of the technical program, it is necessary to take one it is suitable
Value N, in the present embodiment, the value of N=9, N can be set according to actual conditions, and the present embodiment does not do the specific value of N
Limitation.
For example, setting the data for eating dishes without rice or wine to gather as 2500 data, and data are set as data_in=[10*ones (1:
1000), 20*ones (1:148), 10*ones (1:1352)], middle 148 amplitudes are exactly FCCH channels for 20；To this 2500
A data are filtered capture FCCH signals, then n=2500, initialize the number cnt=1, data block length N of filtering data block
=9.
Step 202, N number of data in the block to each data carry out bandpass filtering successively, and calculate each data block filtering
Power afterwards.
According to the property that preset data is single-frequency, in the present embodiment, preset data can be FCCH signals, will be each
Data data in the block are by the bandpass filter of a smaller bandwidth, and bandpass filter passband central frequency is in preset data
Single-frequency.
When enter bandpass filter is preset data, preset data is located exactly in the passband of bandpass filter, in advance
If data are not lost substantially.
For example, bandpass filtering is carried out to the 1st data block (preceding 9 data) of 2500 data, the power before filtering point
Not Wei [10,10,10,10,10,10,10,10,10], it is 90 to calculate the general power before filtering, then carries out bands to this 9 data
Pass filter, if filtered power is respectively [1,1,1,1,1,1,1,1,1], obtains filtered general power 9.
Step 204, when the bandpass filtering of M data block of completion, according to before the M data block filtering for completing bandpass filtering
General power and filtered general power, obtain completing the power ratio of M data block of bandpass filtering.
Wherein, the M is the integer part of L/N, and the L is the channel length of preset data, and M and L are positive integer.
Data block carry out bandpass filtering before calculate data block general power, can according to the general power after bandpass filtering with
General power before bandpass filtering obtains power ratio.When enter bandpass filter is preset data, power ratio is one
Close to 1 value；When enter bandpass filter is not preset data, power ratio is the value of a very little less than 1.
The channel length of FCCH signals is 148, so the number for carrying out the data block of bandpass filtering treatment is counted from cnt=1
After counting to cnt=148/N=16 (round numbers part), then the power of current 16 data blocks before and after bandpass filtering is tired out
Add.
Preferably, the step 204 can include：
Sub-step 2041, when the bandpass filtering of M data block of completion, the M data block that will complete bandpass filtering filters
Preceding power is added up filtered before general power, the M data block filtered power progress of bandpass filtering will be completed
It is cumulative to obtain filtered general power.
For example, power before 16 data block bandpass filterings be respectively 1,2,3,4,5,6,7,8,9,10,11,12,
13,14,15,16 }, the power after bandpass filtering be respectively 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,
17 }, then the general power before filtering is 136, and filtered general power is 152.
Sub-step 2042, filtered general power and the general power before filtering are divided by, obtain the completion bandpass filtering
M data block power ratio.
Above-mentioned filtered general power 152 is divided by with the general power 136 before above-mentioned filtering, obtains power ratio 152/
136≈1.1。
For example, after the filtering of 148/N=16 data block has been completed, before filtering and filtered piece of mean power is
[90,90,90,90,90,90,90,90,90,90,90,90,90,90,90,90] and [9,9,9,9,9,9,9,9,9,9,9,9,
9,9,9,9], add up general power 1440 before obtaining filtering, and general power 144 after filtering, calculating power ratio is 144/1440=
0.1。
Step 206, judge whether to detect the preset data according to the power ratio of the M data block.
Wherein, the preset data is the data of single-frequency.
It should be noted that need to use multiple power ratios in the present embodiment, not only using the power of M data block
Ratio, but multiple power ratios of multigroup M data block.
With the slip of data block in the band-pass filter, a series of power ratios can approximately form a parabola.Cause
M cumulative data block is progressed into for preset data, this process power ratio can be gradually increasing；When M cumulative data
When block is preset data, power ratio reaches maximum；When cumulative M data preset data in the block gradually decreases,
This process power ratio is gradually reduced, the approximate parabola of power ratio of whole process.
The step 206 may be summarized to be three processes, respectively waits and rises, waits peak value threshold and wait decline,
As shown in Figure 4.
Preferably, the step 206 can include：
(1) wait and rising：Power ratio is waited to reach the minimum threshold of an ascent stage.
Sub-step 2061, is set as first minimum power ratio, described in judgement by the power ratio of the M data block
Whether next power ratio of first minimum power ratio and the difference of the first minimum power ratio, which are more than, rises door
Limit.
Wherein, next power ratio is M data block of next group of completion bandpass filtering of current M data block
Power ratio.M data block of the next group of completion bandpass filtering can be with current M data partial data block in the block
It is identical.
When next power ratio of the first minimum power ratio and the difference of the first minimum power ratio
During more than the rising threshold value, sub-step 2062 is performed；When the first minimum power ratio next power ratio with
When the difference of the first minimum power ratio is less than or equal to the rising threshold value, the first minimum power ratio is set
Next power ratio is second minimum power ratio, continues to judge next power of the second minimum power ratio
Whether the difference of ratio and the second minimum power ratio is more than or equal to the rising threshold value, until the least work of some setting
Next power ratio of rate ratio and the difference of the minimum power ratio of some setting are more than the rising threshold value.
Specific implementation is as shown in Figure 5：Set the 0th power_ratio for minimum power than MintRatio, with behind
MaxWaitRiseBlocks-1 (MaxWaitRiseBlocks=10) a power ratio subtract each other respectively with it, obtain difference
PoweRise, PoweRise (j)=power_ratio (j)-MintRatio, j=i+ (1,2 ..., 9), if some difference is more than
The rising threshold value MinRatioTh of setting, then perform sub-step 2062, otherwise by the MaxWaitRiseBlocks power ratio
Minimum power ratio is set to, stays in sub-step 2061.
Wait rise during, will not always using the 0th initial power_ratio as minimum power ratio,
But after MaxWaitRiseBlocks power_ratio, current power_ratio will be put again as least work
Rate ratio, MintRatio=power_ratio (i), it is ensured that real-time.
For example, making MintRatio=0.1, then next power ratio power_ratio1 is calculated, by itself and MintRatio
Subtract each other, judge power_ratio1-MintRatio>Whether 0.1875 (rising threshold value of setting) is set up, and son is entered if setting up
Step 2062；Otherwise continue to calculate next power_ratio2, when the 10th power_ratio10, if MintRatio
=power_ratio10, continues to calculate power_ratio.During to the 111st power_ratio111, the data block before filtering
For [9,20,20,20,20,20,20,20,20], the power before filtering is 367, is carried out total before 16 cumulative data blocks filter
Power is updated to [367,90,90,90,90,90,90,90,90,90,90,90,90,90,90,90]；Assuming that filtered data block
For [1,20,20,20,20,20,20,20,20], filtered power is 356, is carried out total after 16 cumulative data blocks filter
Power is updated to [356,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], then power ratio is power_ratio111=
371/1717=0.216>0.1875, perform sub-step 2062.
(2) peak value threshold is waited：Power ratio is waited to reach peak value threshold.
Sub-step 2062, judges whether the first minimum power ratio is more than peak value threshold.
When the first minimum power ratio is more than the peak value threshold, sub-step 2063 is performed；When described first
When a minimum power ratio is less than or equal to the peak value threshold, continue to judge next work(of the first minimum power ratio
Whether rate ratio is more than the peak value threshold, until some power ratio is more than the peak value threshold.
Specific implementation is as shown in Figure 6：If a peak value threshold DetectRatioTh, if power ratio power_ratio
More than the peak value threshold, then sub-step 2063 is performed, sub-step 2062 is otherwise stayed in, whether judges next power_ratio
More than the peak value threshold.
For example, with more and more FCCH signals in 16 cumulative data blocks are carried out, power ratio is increasing, reaches
To power_ratio>Sub-step 2063 is performed when 0.5 (peak value threshold of setting).
(3) wait and declining：Power ratio is waited to reach the thresholding of decline stage.
Sub-step 2063, completes to determine most in multiple power ratios obtained from bandpass filtering from multigroup M data block
High-power ratio, and judge whether the difference of next power ratio of the maximum power ratio and the maximum power ratio is big
In decline thresholding.
When the difference of the maximum power ratio and next power ratio of the maximum power ratio is more than the decline
During thresholding, judgement detects the preset data；When the maximum power ratio and next work(of the maximum power ratio
When the difference of rate ratio is less than or equal to the decline thresholding, continue to judge the maximum power ratio and the maximum power ratio
Whether the difference of the power ratio after next power ratio is more than the decline thresholding, up to the maximum power ratio and some
The difference of power ratio is more than the decline thresholding.
Specific implementation is as shown in Figure 7：The peak value MaxRatio=power_ratio (max) of power ratio is found first (i.e.
Parabolical maximum), peak value MaxRatio and ensuing power ratio power_ratio are subtracted each other, if difference is more than
The minimum of setting declines thresholding FallRatioTh, FallRatioTh (i)=MaxRatio-power_ratio (i), then judges
Examine FCCH signals；Otherwise sub-step 2063 is stayed in.
For example, when carrying out all FCCH signals of 16 cumulative data blocks, power ratio reaches maximum, Zhi Houfei
The data block of FCCH signals will enter cumulative ranks, and power_ratio is gradually reduced again, poor small with maximum when dropping to
When 0.0625 (the minimum of setting declines thresholding), then judge to detect FCCH signals.
If detecting the preset data, step 208 is performed；If being not detected by the data, it is default to continue to execute detection
The operation of data.
Step 208, the Frequency Synchronization of cell searching is carried out using the preset data.
The implementation procedure that the Frequency Synchronization of cell searching is carried out in the step 208 is referred to existing cell searching
Frequency Synchronization.
In conclusion the technical solution in the embodiment of the present invention is obtained by carrying out piecemeal operation to the data in buffering area
To multiple data blocks, wherein, each data block includes N number of data, and N is positive integer；N number of data in the block to each data according to
Secondary carry out bandpass filtering, the bandpass filter used in carrying out bandpass filtering has certain bandwidth, even if local clock
In the case that frequency and carrier frequency offset reach 1KHZ, remain able to accurately detect preset data, using preset data into
The Frequency Synchronization of row cell searching, improves the stability of the Frequency Synchronization of cell searching.
It is affected by noise small since preset data has the frequency characteristic of single-frequency, carried out using preset data small
The Frequency Synchronization of area searching, improves the accuracy of the Frequency Synchronization of cell searching.
Embodiment three
A kind of frequency synchronization method of cell searching provided in an embodiment of the present invention is discussed in detail.
Reference Fig. 8, shows a kind of frequency synchronization method flow chart of cell searching in the embodiment of the present invention.
Step 300, the data in buffering area are divided into includes the data block of N number of data, and the data length of buffering area is n.
Step 302, judge whether n is more than 0.
When n is more than 0, step 304 is performed；When n is less than or equal to 0, flow terminates.
Step 304, power of the data before filtering in buffering area is calculated.
Step 306, the data in buffering area are filtered.
Step 308, the power of data after the filtering in buffering area is calculated.
Step 310, whether the number cnt for the data block for judging to be filtered processing is more than or equal to 148/N.
When cnt is more than or equal to 148/N, step 312 is performed；When cnt is less than 148/N, step 314 is performed.
Step 312, power ratio is calculated.
Step 314, n-=N, cnt+=1.
Step 316, judge whether to capture FCCH signals.
When capturing FCCH signals, step 318 is performed；When not capturing FCCH signals, step 302 is performed, is calculated
The front and rear power of next data block filtering, abandons the front and rear performance number of data block filtering oldest in 148/N data block.
The data block calculated in the front and rear power of next data block filtering is all to eat dishes without rice or wine to be transmitted through the number after next down-sampling
According to unless FCCH signal captures terminate, otherwise eating dishes without rice or wine can forward data always.
Add up every time to 148/N data block, oldest data block is first data block in this 148/N.
Such as：Power before 148/N data block bandpass filtering be respectively 1,2,3,4,5,6,7,8,9,10,11,
12,13,14,15,16 }, the power after bandpass filtering be respectively 2,3,4,5,6,7,8,9,10,11,12,13,14,15,
16,17 }, the general power before filtering is 136, and filtered general power is 152.Then power ratio power_ratio is front and rear two
After number group adds up respectively, the latter divided by the former value, i.e., 152/136 value.When the filter that next data block is calculated
When power after wavefront is respectively 18 and 19, then carrying out two cumulative number groups is respectively：18,2,3,4,5,6,7,8,9,10,
11,12,13,14,15,16 } and { 19,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17 }, both add up respectively,
The latter divided by the former, then obtain next power ratio power_ratio.
Step 318, the Frequency Synchronization of cell searching is carried out according to FCCH signals.
The sliding correlation method mentioned in background technology and amplitude method are subjected to emulation pair with the method in the embodiment of the present invention
Than (window a length of 148 of wherein sliding correlation method, sliding window is a length of 9), and comparison diagram is as shown in Figure 9, Figure 10.Known by Fig. 9, this hair
The sliding correlation method in filter method and background technology in bright embodiment is in frequency deviation in positive and negative 1KHz, FCCH site errors change
Smaller, performance is more stable, and the FCCH site errors of filter method are minimum, better than sliding correlation method.In addition, known by Figure 10,
Under different signal-to-noise ratio, the FCCH site errors of filter method are still minimum, have relatively good performance.
In conclusion the technical solution in the embodiment of the present invention is obtained by carrying out piecemeal operation to the data in buffering area
To multiple data blocks, wherein, each data block includes N number of data, and N is positive integer；N number of data in the block to each data according to
Secondary carry out bandpass filtering, the bandpass filter used in carrying out bandpass filtering has certain bandwidth, even if local clock
In the case that frequency and carrier frequency offset reach 1KHZ, remain able to accurately detect preset data, using preset data into
The Frequency Synchronization of row cell searching, improves the stability of the Frequency Synchronization of cell searching.
It is affected by noise small since preset data has the frequency characteristic of single-frequency, carried out using preset data small
The Frequency Synchronization of area searching, improves the accuracy of the Frequency Synchronization of cell searching.
Example IV
A kind of frequency synchronization device of cell searching provided in an embodiment of the present invention is discussed in detail.
Reference Figure 11, shows a kind of frequency synchronization device structure chart of cell searching in the embodiment of the present invention.
Described device can include：Piecemeal module 400, filter module 402, power ratio computing module 404, judgment module
406, frequency synchronization module 408.
Be discussed in detail separately below each module function and each module between relation.
Piecemeal module 400, for carrying out piecemeal operation to the data in buffering area, obtains multiple data blocks, wherein, each
Data block includes N number of data, and N is positive integer.
Filter module 402, for each data N number of data in the block to be carried out with bandpass filtering successively, and calculates per number
According to the filtered power of block.
Power ratio computing module 404, for when completing the bandpass filtering of M data block, according to completion bandpass filtering
The filtering of M data block before general power and filtered general power, obtain completing the power ratio of M data block of bandpass filtering
Value, wherein, the M is the integer part of L/N, and the L is the channel length of preset data, and M and L are positive integer.
Judgment module 406, for judging whether to detect the present count according to the power ratio of the M data block
According to；The preset data is the data of single-frequency.
Frequency synchronization module 408, if for detecting the preset data, carries out cell using the preset data and searches
The Frequency Synchronization of rope.
In conclusion the technical solution in the embodiment of the present invention is obtained by carrying out piecemeal operation to the data in buffering area
To multiple data blocks, wherein, each data block includes N number of data, and N is positive integer；N number of data in the block to each data according to
Secondary carry out bandpass filtering, the bandpass filter used in carrying out bandpass filtering has certain bandwidth, even if local clock
In the case that frequency and carrier frequency offset reach 1KHZ, remain able to accurately detect preset data, using preset data into
The Frequency Synchronization of row cell searching, improves the stability of the Frequency Synchronization of cell searching.
It is affected by noise small since preset data has the frequency characteristic of single-frequency, carried out using preset data small
The Frequency Synchronization of area searching, improves the accuracy of the Frequency Synchronization of cell searching.
Embodiment five
A kind of frequency synchronization device of cell searching provided in an embodiment of the present invention is discussed in detail.
Reference Figure 12, shows a kind of frequency synchronization device structure chart of cell searching in the embodiment of the present invention.
Described device can include：Piecemeal module 500, filter module 502, power ratio computing module 504, judgment module
506, frequency synchronization module 508.
Wherein, the power ratio computing module 504 can include：Power adds up submodule 5041, and power is divided by submodule
Block 5042.
The judgment module 506 can include：Minimum power ratio sets submodule 5061, rising threshold value judging submodule
5062, peak value threshold judging submodule 5063, declines thresholding judging submodule 5064, preset data judging submodule 5065.
The relation between each module, the function of each submodule and each module, each submodule is discussed in detail separately below.
Piecemeal module 500, for carrying out piecemeal operation to the data in buffering area, obtains multiple data blocks, wherein, each
Data block includes N number of data, and N is positive integer.
Filter module 502, for each data N number of data in the block to be carried out with bandpass filtering successively, and calculates per number
According to the filtered power of block.
Power ratio computing module 504, for when completing the bandpass filtering of M data block, according to completion bandpass filtering
The filtering of M data block before general power and filtered general power, obtain completing the power ratio of M data block of bandpass filtering
Value, wherein, the M is the integer part of L/N, and the L is the channel length of preset data, and M and L are positive integer.
Preferably, the power ratio computing module 504 can include：
Power adds up submodule 5041, for when completing the bandpass filtering of M data block, will completion bandpass filtering M
Power before the filtering of a data block add up the general power before filter, will completion bandpass filtering the filtering of M data block
Power afterwards is added up to obtain filtered general power.
Power is divided by submodule 5042, for the general power before filtered general power and filtering to be divided by, obtains described
Complete the power ratio of M data block of bandpass filtering.
Judgment module 506, for judging whether to detect the present count according to the power ratio of the M data block
According to；The preset data is the data of single-frequency.
Preferably, the judgment module 506 can include：
Minimum power ratio sets submodule 5061, for the power ratio of the M data block to be set as first
Minimum power ratio.
Preferably, the minimum power ratio setting submodule 5061, is additionally operable to work as the first minimum power ratio
Next power ratio and the difference of first minimum power ratio when being less than or equal to the rising threshold value, setting described the
Next power ratio of one minimum power ratio is second minimum power ratio.
Rising threshold value judging submodule 5062, for judging next power ratio of the first minimum power ratio
And whether the difference of the first minimum power ratio is more than rising threshold value.Next power ratio is current M data
The power ratio of M data block of next group of completion bandpass filtering of block.
Preferably, the rising threshold value judging submodule 5062 continues to judge the next of the second minimum power ratio
Whether a power ratio and the difference of the second minimum power ratio are more than or equal to the rising threshold value, until some setting
Next power ratio of minimum power ratio and the difference of the minimum power ratio of some setting are more than the rising threshold value.
Peak value threshold judging submodule 5063, for when the first minimum power ratio next power ratio with
When the difference of the first minimum power ratio is more than the rising threshold value, judge whether the first minimum power ratio is big
In peak value threshold.
Preferably, the peak value threshold judging submodule 5063, is additionally operable to when the first minimum power ratio is less than
During equal to the peak value threshold, continue to judge next power ratio of the first minimum power ratio whether more than described
Peak value threshold, until some power ratio is more than the peak value threshold.
Decline thresholding judging submodule 5064, for being more than the peak value threshold when the first minimum power ratio
When, complete to determine maximum power ratio in multiple power ratios obtained from bandpass filtering from multigroup M data block, and judge
Whether the difference of next power ratio of the maximum power ratio and the maximum power ratio, which is more than, declines thresholding.
Preferably, the decline thresholding judging submodule 5064, is additionally operable to when the maximum power ratio and the maximum
When the difference of next power ratio of power ratio is less than or equal to the decline thresholding, continue to judge the maximum power ratio with
Whether the difference of the power ratio after next power ratio of the maximum power ratio is more than the decline thresholding, until institute
The difference for stating maximum power ratio and some power ratio is more than the decline thresholding.
Preset data judging submodule 5065, for next when the maximum power ratio and the maximum power ratio
When the difference of a power ratio is more than the decline thresholding, judgement detects the preset data.
Frequency synchronization module 508, if for detecting the preset data, carries out cell using the preset data and searches
The Frequency Synchronization of rope.
In conclusion the technical solution in the embodiment of the present invention is obtained by carrying out piecemeal operation to the data in buffering area
To multiple data blocks, wherein, each data block includes N number of data, and N is positive integer；N number of data in the block to each data according to
Secondary carry out bandpass filtering, the bandpass filter used in carrying out bandpass filtering has certain bandwidth, even if local clock
In the case that frequency and carrier frequency offset reach 1KHZ, remain able to accurately detect preset data, using preset data into
The Frequency Synchronization of row cell searching, improves the stability of the Frequency Synchronization of cell searching.
It is affected by noise small since preset data has the frequency characteristic of single-frequency, carried out using preset data small
The Frequency Synchronization of area searching, improves the accuracy of the Frequency Synchronization of cell searching.
For device embodiment, since it is substantially similar to embodiment of the method, so description is fairly simple, it is related
Part illustrates referring to the part of embodiment of the method.
Each embodiment in this specification is described by the way of progressive, what each embodiment stressed be with
The difference of other embodiment, between each embodiment identical similar part mutually referring to.
The frequency synchronization method and device of a kind of cell searching provided above the embodiment of the present invention, have carried out in detail
Introduce, specific case used herein is set forth the principle of the present invention and embodiment, the explanation of above example
It is only intended to help the method and its core concept for understanding the present invention；Meanwhile for those of ordinary skill in the art, according to this
The thought of invention, there will be changes in specific embodiments and applications, in conclusion this specification content should
It is interpreted as limitation of the present invention.
Claims (10)
- A kind of 1. frequency synchronization method of cell searching, it is characterised in that including：Piecemeal operation is carried out to the data in buffering area, obtains multiple data blocks, wherein, each data block includes N number of data, N is positive integer；N number of data in the block to each data carry out bandpass filtering successively, and calculate the filtered power of each data block；When the bandpass filtering of M data block of completion, according to the general power before the M data block filtering for completing bandpass filtering and filter General power after ripple, obtains completing the power ratio of M data block of bandpass filtering, wherein, the M is the integer part of L/N, The L is the channel length of preset data, and M and L are positive integer；Judged whether to detect the preset data according to the power ratio of the M data block, including：By the M data The power ratio of block is set as first minimum power ratio；Judge next power ratio of the first minimum power ratio Whether value and the difference of the first minimum power ratio are more than rising threshold value；Next power ratio is current M number According to the power ratio of M data block of next group of completion bandpass filtering of block；It is next when the first minimum power ratio When a power ratio and the difference of the first minimum power ratio are more than the rising threshold value, first least work is judged Whether rate ratio is more than peak value threshold；When the first minimum power ratio is more than the peak value threshold, from multigroup M number Maximum power ratio is determined in multiple power ratios obtained from completing bandpass filtering according to block, and judges the maximum power ratio Whether the difference of value and next power ratio of the maximum power ratio, which is more than, declines thresholding；When the maximum power ratio with When the difference of next power ratio of the maximum power ratio is more than the decline thresholding, judgement detects the present count According to；The preset data is the data of single-frequency；If detecting the preset data, the Frequency Synchronization of cell searching is carried out using the preset data.
- 2. according to the method described in claim 1, it is characterized in that, described when completing the bandpass filtering of M data block, according to The general power before the M data block filtering of bandpass filtering and filtered general power are completed, obtains completing M number of bandpass filtering According to the power ratio of block, including：It is described when completing the bandpass filtering of M data block, the power progress before M data block for completing bandpass filtering is filtered The general power to add up before being filtered, the filtered power of M data block for completing bandpass filtering is added up and is filtered General power afterwards；Filtered general power and the general power before filtering are divided by, obtain the work(of M data block of the completion bandpass filtering Rate ratio.
- 3. according to the method described in claim 1, it is characterized in that, the method further includes：When next power ratio of the first minimum power ratio and the difference of the first minimum power ratio are less than During equal to the rising threshold value, next power ratio of the first minimum power ratio is set as second minimum power Ratio；Continue to judge the second minimum power ratio next power ratio and the second minimum power ratio it Difference whether be more than or equal to the rising threshold value, until some setting minimum power ratio next power ratio and it is described certain The difference of the minimum power ratio of a setting is more than the rising threshold value.
- 4. according to the method described in claim 1, it is characterized in that, the method further includes：When the first minimum power ratio is less than or equal to the peak value threshold, continue to judge first minimum power Whether next power ratio of ratio is more than the peak value threshold, until some power ratio is more than the peak value threshold.
- 5. according to the method described in claim 1, it is characterized in that, the method further includes：When the difference of the maximum power ratio and next power ratio of the maximum power ratio is less than or equal to the decline During thresholding, continue to judge the maximum power ratio and the power ratio after next power ratio of the maximum power ratio Whether the difference of value is more than the decline thresholding, until the difference of the maximum power ratio and some power ratio is more than the decline door Limit.
- A kind of 6. frequency synchronization device of cell searching, it is characterised in that including：Piecemeal module, for carrying out piecemeal operation to the data in buffering area, obtains multiple data blocks, wherein, each data block Include N number of data, N is positive integer；Filter module, for carrying out bandpass filtering successively to each data N number of data in the block, and calculates each data block filtering Power afterwards；Power ratio computing module, for when completing the bandpass filtering of M data block, according to M number of completion bandpass filtering General power and filtered general power before being filtered according to block, obtain completing the power ratio of M data block of bandpass filtering, its In, the M is the integer part of L/N, and the L is the channel length of preset data, and M and L are positive integer；Judgment module, for judging whether to detect the preset data according to the power ratio of the M data block；It is described pre- If data are the data of single-frequency；The judgment module, including：Minimum power ratio sets submodule, for by the M The power ratio of data block is set as first minimum power ratio；Rising threshold value judging submodule, for judging described first Whether next power ratio of a minimum power ratio and the difference of the first minimum power ratio are more than rising threshold value；Institute State the power ratio of M data block of the next group of completion bandpass filtering that next power ratio is current M data block；Peak value Thresholding judging submodule, for next power ratio when the first minimum power ratio and first least work When the difference of rate ratio is more than the rising threshold value, judge whether the first minimum power ratio is more than peak value threshold；Decline Thresholding judging submodule, for when the first minimum power ratio is more than the peak value threshold, from multigroup M data block Complete to determine maximum power ratio in multiple power ratios obtained from bandpass filtering, and judge the maximum power ratio with Whether the difference of next power ratio of the maximum power ratio, which is more than, declines thresholding；Preset data judging submodule, is used for When the difference of the maximum power ratio and next power ratio of the maximum power ratio is more than the decline thresholding, sentence It is disconnected to detect the preset data；Frequency synchronization module, if for detecting the preset data, the frequency of cell searching is carried out using the preset data Rate is synchronous.
- 7. device according to claim 6, it is characterised in that the power ratio computing module, including：Power adds up submodule, for when completing the bandpass filtering of M data block, will completion bandpass filtering M data block Power before filtering is added up filtered before general power, will complete bandpass filtering the filtered power of M data block Added up to obtain filtered general power；Power is divided by submodule, for the general power before filtered general power and filtering to be divided by, obtains the completion band logical The power ratio of M data block of filtering.
- 8. device according to claim 6, it is characterised in thatThe minimum power ratio sets submodule, is additionally operable to next power ratio when the first minimum power ratio And when the difference of the first minimum power ratio is less than or equal to the rising threshold value, set the first minimum power ratio Next power ratio be second minimum power ratio；The rising threshold value judging submodule continues to judge next power ratio and the institute of the second minimum power ratio Whether the difference for stating second minimum power ratio is more than or equal to the rising threshold value, until the minimum power ratio of some setting Next power ratio and the difference of the minimum power ratio of some setting are more than the rising threshold value.
- 9. device according to claim 6, it is characterised in thatThe peak value threshold judging submodule, is additionally operable to when the first minimum power ratio is less than or equal to the peak value threshold When, continue to judge whether next power ratio of the first minimum power ratio is more than the peak value threshold, until certain A power ratio is more than the peak value threshold.
- 10. device according to claim 6, it is characterised in thatThe decline thresholding judging submodule, is additionally operable to next when the maximum power ratio and the maximum power ratio When the difference of power ratio is less than or equal to the decline thresholding, continue to judge the maximum power ratio and the maximum power ratio Next power ratio after the difference of power ratio whether be more than the decline thresholding, until the maximum power ratio and certain The difference of a power ratio is more than the decline thresholding.
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| CN1855768A (en) * | 2005-04-20 | 2006-11-01 | 大唐移动通信设备有限公司 | Coarse synchronizing method and device for cell searching |
| CN103096452A (en) * | 2011-10-28 | 2013-05-08 | 联芯科技有限公司 | Method and device of acquiring frequency correction burst (FB) |
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| CN1855768A (en) * | 2005-04-20 | 2006-11-01 | 大唐移动通信设备有限公司 | Coarse synchronizing method and device for cell searching |
| CN103096452A (en) * | 2011-10-28 | 2013-05-08 | 联芯科技有限公司 | Method and device of acquiring frequency correction burst (FB) |
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