CN105530081B - A kind of method of PSS timing adjustments in LTE system - Google Patents
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Abstract
The invention discloses a kind of methods of PSS timing adjustments in LTE system, include the following steps：1) it filters；2) down-sampled；3) PSS is synchronized；4) calculating of first diameter and initial timing positions deviation；5) adjustment of down-sampled lower PSS timing positions；6) SSS is synchronized.The present invention is adjusted the PSS timing positions under down-sampled according to the deviation between first path position and initial timing positions, improves the accuracy of down-sampled lower PSS timing positions；The present invention also improves the correct detection probability of the performance and cell ID of SSS synchronizations while improving down-sampled lower PSS timing positions accuracy.
Description
Technical field
The present invention relates to the technical fields of LTE (long term evolution) system descending synchronization timing adjustment, refer in particular to a kind of LTE
The method of PSS (primary synchronization signal) timing adjustment in system.
Background technology
In LTE communication system, in mobile terminal-opening or step-out, need carry out cell searching, complete with base station it
Between time and Frequency Synchronization.Mainly in two steps, the first step is that PSS is synchronized to cell searching, is obtained in half frame timing and cell group
Number, second step are SSS (secondary synchronization signal) synchronous, obtain frame timing and cell group number.It is that PSS is synchronized since SSS is synchronized
It is carried out on the basis of obtaining PSS timing positions in the process, therefore to directly affect SSS same for the accuracy of PSS timing positions
The performance of step.On 62 subcarriers being only mapped near direct current subcarrier on frequency domain due to synchronizing signal, it is contemplated that synchronous
This feature of signal bandwidth generally improves cell searching efficiency, patent of invention in cell search process using down-sampled
A kind of document [process patent number for realizing TD-LTE digital relay technology initial synchronisation：201210237633 invention designers：Liu
Sword flies；Wang Chenyang；Zeng Xiangye；Wang Mengjun；Yang Jianpo] in disclose it is a kind of it is down-sampled under down link synchronisation method, use
The sample rate of 1.92MHz can complete down-going synchronous under the premise of not knowing downlink bandwidth, but in known downlink bandwidth
Under the premise of, the PSS timing positions under down-sampled can be adjusted, to obtain more accurate PSS timing positions.Patent of invention
A kind of document [process patent number for TD-LTE system Time and Frequency Synchronization：201110094759 invention designers：Chen Fatang；Horse
It is of heap of stone；Li little Wen；Wangdan；Wang Huahua；Liu Yu；Xu Yanbin；It reaches the clouds will；Huang wu] in disclose a kind of auto-correlation and mutually tied with cross-correlation
The PSS synchronous method of conjunction, the baseband signal of reception has been carried out it is down-sampled, on the basis for obtaining down-sampled lower PSS timing positions
It is upper to calculate non-down-sampled lower PSS timings, but the PSS timing positions under down-sampled are not adjusted.
It is existing it is down-sampled under LTE system down-going synchronous scheme in, usually first docking, which is collected mail, number is filtered, and filters same
The signal other than signal bandwidth is walked, it is down-sampled after filtering, PSS synchronizations are then carried out, down-sampled lower PSS timing positions are being obtained
Later, the timing position for directly using down-sampled lower PSS extracts SSS according to the relative position relation of PSS and SSS and carries out SSS
It is synchronous.However due to the presence of multipath in wireless channel environment, the inaccurate of PSS timings can be led to, existing solution is not examined
Consider will definitely not being adversely affected to the synchronous belt of SSS for PSS timing positions.
Invention content
The shortcomings that it is an object of the invention to overcome the prior art with it is insufficient, PSS timing adjustments in a kind of LTE system are provided
Method, using it is non-it is down-sampled under PSS timing positions the PSS timing positions under down-sampled are adjusted, it is fixed to improve PSS
When accuracy, while improving the performance that follow-up SSS is synchronized.
To achieve the above object, technical solution provided by the present invention is：The side of PSS timing adjustments in a kind of LTE system
Method includes the following steps：
1) it filters
The purpose of filtering is interference of the signal to synchronizing signal subcarrier reduced other than synchronizing signal bandwidth, is believed base band
It number is filtered, filters out the signal other than synchronizing signal bandwidth；
2) down-sampled
Down-sampled purpose is to reduce the calculation amount of related operation in subsequent synchronization processes, it is assumed that down-sampled previous existence is at OFDM
Symbol is N using the points of IFFTIFFT, N is carried out to filtered signaldownSamAgain down-sampled, then it is down-sampled to generate OFDM afterwards
Symbol is using the points of IFFT
3) PSS is synchronized
3.1) according to the down-sampled rear points for generating OFDM symbol and using IFFTIt is numbered in cell groupIt generates
The local time domain reference signal of three groups of down-sampled lower PSS, generation the specific steps are：1. basisValue 0,1 and 2, calculate
Three groups of frequency domain primary synchronization signal sequences are obtained, the length of frequency domain primary synchronization signal sequence is 62；2. by the main synchronous letter of three groups of frequency domains
Number sequence is respectively mapped to before and after direct current subcarrier on each 31 subcarriers；3. being mended before primary synchronization signal subcarrierA zero, behind mendA zero, remove progress after frequency processingPoint IFFT transformation,It indicates
It rounds up,Indicate downward rounding；
3.2) by the local time domain reference signal of three groups of down-sampled lower PSS respectively with it is down-sampled in step 2) after base band believe
Number do sliding related operation, obtain the local time domain reference signal of three groups of down-sampled lower PSS and baseband signal each may
The correlation of time synchronization point finds out maximum related value, maximum related value pair in the correlation of be possible to time synchronization point
The time synchronization point answered is the timing position of down-sampled lower PSS, is denoted as tcoarse, the corresponding group number of maximum related value is as small
Number in district's groups；
4) calculating of first diameter and initial timing positions deviation
4.1) according to the non-down-sampled lower points N for generating OFDM symbol and using IFFT in step 2)IFFTAnd in step 3)
Number in determining cell group, generates the local time domain reference signal of non-down-sampled lower PSS, generation the specific steps are：1. root
Frequency domain primary synchronization signal sequence, the length of frequency domain primary synchronization signal sequence is calculated according to number in the cell group determined in step 3)
Degree is 62；2. obtained frequency domain primary synchronization signal sequence is mapped to before and after direct current subcarrier on each 31 subcarriers；3. in master
It is mended before synchronizing signal subcarrierA zero, behind mendA zero, remove progress after frequency processing
NIFFTPoint IFFT transformation,Expression rounds up,Indicate downward rounding；
4.2) timing position of the down-sampled lower PSS obtained according to step 3) determines the timing position of non-down-sampled lower PSS
It sets, the N forward centered on the positiong·NIFFTA sampled point in/(2 × 2048), N heregIt indicates under 20MHz channel widths
The length of Normal CP, value 144, backward 32NIFFTSearch window 1 is arranged in/2048 sampled points, the meter in search window 1
The correlation for calculating filtered baseband signal and the local time domain reference signal of non-down-sampled lower PSS in step 1), finds out correlation
The maximum value P of value0, and using the corresponding position of the maximum value as starting point, forward trace Ng·NIFFTA sampled point in/(4 × 2048)
Search window 2 is obtained, first is then found in search window 2 is more than or equal to β P0Correlation, wherein β be corresponding thresholding
Value, β ∈ (0,1], the position of the sampled point corresponding to the correlation be headed by diameter position, be denoted as tfirst, can then obtain
Deviation delta between first diameter and initial timing positions is：
Δ=tfirst-tcoarse·NdownSam；
5) adjustment of down-sampled lower PSS timing positions
According to the deviation between step 4) the first diameter calculated and initial timing positions to the PSS timings position under down-sampled
Set tcoarseIt is adjusted, it is assumed that the down-sampled lower PSS timing positions after adjusting are t 'coarse, then the principle adjusted is：
Wherein, | | expression takes absolute value,Indicate that downward rounding, sign () indicate the sign of round numbers；
6) SSS is synchronized
The down-sampled lower PSS timing positions t ' calculated according to step 5)coarseAnd the relative position of PSS and SSS is closed
System determines the position where SSS, carries out the synchronization of SSS after extraction SSS to obtain cell group number and frame timing, in conjunction with
Number can calculate cell ID in the cell group obtained in step 3).
Compared with prior art, the present invention having the following advantages that and advantageous effect：
1, the present invention according to the deviation between first path position and initial timing positions to the PSS timing positions under down-sampled into
Row adjustment, improves the accuracy of down-sampled lower PSS timing positions.
2, the present invention also improved while improving down-sampled lower PSS timing positions accuracy SSS synchronize performance and
The correct detection probability of cell ID.
Description of the drawings
Fig. 1 is the overview flow chart of the method for the present invention.
Fig. 2 is influence curve figure of the PSS timing positions adjustment to timing accuracy.
Specific implementation mode
The present invention is further explained in the light of specific embodiments.
As shown in Figure 1, in LTE system described in the present embodiment PSS timing adjustments method, include the following steps：
1) it filters
The purpose of filtering is interference of the signal to synchronizing signal subcarrier reduced other than synchronizing signal bandwidth, is believed base band
It number is filtered, filters out the signal other than synchronizing signal bandwidth；And in the present embodiment, baseband filter will be according to system
It needs to design, the design objective of filter is：Sample rate 30.72MHz, pass band width 472.5KHz, stopband initial frequency
547.5KHz, attenuation outside a channel 20dB, passband fluctuation 0.1dB.
2) down-sampled
3) PSS is synchronized
3.1) according to the down-sampled rear points for generating OFDM symbol and using IFFTIt is numbered in cell groupIt generates
The local time domain reference signal of three groups of down-sampled lower PSS, generation the specific steps are：1. basisValue 0,1 and 2, calculate
Three groups of frequency domain primary synchronization signal sequences are obtained, the length of frequency domain primary synchronization signal sequence is 62；2. by the main synchronous letter of three groups of frequency domains
Number sequence is respectively mapped to before and after direct current subcarrier on each 31 subcarriers；3. being mended before primary synchronization signal subcarrierA zero, behind mendA zero, remove progress after frequency processingPoint IFFT transformation,It indicates
It rounds up,Indicate downward rounding, and in the present embodiment, 33 zero are mended specifically before primary synchronization signal subcarrier,
32 zero are mended below, remove 128 point IFFT transformation of progress after frequency processing；
3.2) by the local time domain reference signal of three groups of down-sampled lower PSS respectively with it is down-sampled in step 2) after base band believe
Number sliding related operation is done, related operation here uses fast FFT algorithm, by the sliding dependent conversion of time domain being total to for frequency domain
Yoke is multiplied, and substantially increases relevant efficiency, and related operation herein can also use other relevant algorithms of calculating to substitute, than
It is such as segmented correlation, difference is related, matched filtering etc.；Related operation obtains the local time domain reference signal of three groups of down-sampled lower PSS
With baseband signal in the correlation of each possible time synchronization point, found out most in the correlation of be possible to time synchronization point
Big correlation, the corresponding time synchronization point of maximum related value are the timing position of down-sampled lower PSS, are denoted as tcoarse, maximum phase
Value corresponding group number in pass is number in cell group, so far completes the synchronization of PSS.
4) calculating of first diameter and initial timing positions deviation
4.1) according to the non-down-sampled lower points N for generating OFDM symbol and using IFFT in step 2)IFFTAnd in step 3)
Number in determining cell group, generates the local time domain reference signal of non-down-sampled lower PSS, generation the specific steps are：1. root
Frequency domain primary synchronization signal sequence, the length of frequency domain primary synchronization signal sequence is calculated according to number in the cell group determined in step 3)
Degree is 62；2. obtained frequency domain primary synchronization signal sequence is mapped to before and after direct current subcarrier on each 31 subcarriers；3. in master
It is mended before synchronizing signal subcarrierA zero, behind mendA zero, remove progress after frequency processing
NIFFTPoint IFFT transformation,Expression rounds up,Indicate downward rounding, and in the present embodiment, specifically in main synchronous letter
993 zero are mended before sub-carriers, behind mend 992 zero, remove and carry out 2048 point IFFT transformation after frequency processing；
4.2) timing position of the down-sampled lower PSS obtained according to step 3) determines the timing position of non-down-sampled lower PSS
It sets, the N forward centered on the positiong·NIFFT/ (2 × 2048) a sampled point (N heregIt indicates under 20MHz channel widths
The length of Normal CP, value 144), 32N backwardIFFTSearch window 1 is arranged in/2048 sampled points, and in the present embodiment
In, the specifically above rheme is set to center 72 sampled points forward, and search window 1 is arranged in 32 sampled points backward；In search window 1
The correlation of filtered baseband signal and the local time domain reference signal of non-down-sampled lower PSS in step 1) is calculated, phase is calculated
The method of pass value is consistent with the method for correlation is calculated in step 3)；Find out the maximum value P of correlation0, and with the maximum value pair
The position answered is starting point, forward trace Ng·NIFFT/ (4 × 2048) a sampled point (N heregIndicate 20MHz channel widths
The length of lower Normal CP, value 144) search window 2 is obtained, and in the present embodiment, specifically 36 samplings of forward trace
Point obtains search window 2, and then search first is more than or equal to β P in search window 20Correlation, wherein β be corresponding door
Limit value, β ∈ (0,1] (β values here be 0.5), the position of the sampled point corresponding to the correlation be headed by diameter position, note
For tfirst, the deviation delta that can then obtain between first diameter and initial timing positions is：
Δ=tfirst-tcoarse·NdownSam。
5) adjustment of down-sampled lower PSS timing positions
According to the deviation between step 4) the first diameter calculated and initial timing positions to the PSS timings position under down-sampled
Set tcoarseIt is adjusted, it is assumed that the down-sampled lower PSS timing positions after adjusting are t 'coarse, then the principle adjusted is：
Wherein, | | expression takes absolute value,Indicate that downward rounding, sign () indicate the sign of round numbers.
6) SSS is synchronized
The down-sampled lower PSS timing positions t ' calculated according to step 5)coarseAnd the relative position of PSS and SSS is closed
System determines the position where SSS, carries out the synchronization of SSS after extraction SSS to obtain cell group number and frame timing, in conjunction with
Number can calculate cell ID (mark) in the cell group obtained in step 3).
In order to verify the validity of the technical program, compared down-sampled lower PSS timing positions adjustment and not adjust two kinds
In the case of PSS timing positions accuracy.The simulated conditions of setting are as follows：2000 emulation, CP types are Normal CP, double
Work mode TDD, first diameter threshold value=0.5, SSS noncoherent detection, channel width 20MHz, wireless channel type ETU70 are imitated
True the results are shown in Figure 2, it can be seen from the figure that the timing accuracy after the adjustment of PSS timing positions has compared with not adjusting
Larger raising.
In conclusion compared with prior art, the method for the present invention during LTE system down-going synchronous using it is non-it is down-sampled under
PSS timing positions are adjusted the PSS timing positions under down-sampled, the accuracy of down-sampled lower PSS timings are improved, after being
Continuous extraction SSS provides accurately timing, while improving the performance of SSS synchronizations, is worthy to be popularized.
The examples of implementation of the above are only the preferred embodiments of the invention, and the implementation model of the present invention is not limited with this
It encloses, therefore changes made by all shapes according to the present invention, principle, should all cover within the scope of the present invention.
Claims (1)
1. a kind of method of PSS timing adjustments in LTE system, which is characterized in that include the following steps：
1) it filters
The purpose of filtering is interference of the signal to synchronizing signal subcarrier reduced other than synchronizing signal bandwidth, to baseband signal into
Row is filtered, and filters out the signal other than synchronizing signal bandwidth；
2) down-sampled
Down-sampled purpose is to reduce the calculation amount of related operation in subsequent synchronization processes, it is assumed that down-sampled previous existence is at OFDM symbol
Points using IFFT are NIFFT, N is carried out to filtered signaldownSamAgain down-sampled, then it is down-sampled to generate OFDM symbol afterwards
It is using the points of IFFT
3) PSS is synchronized
3.1) according to the down-sampled rear points for generating OFDM symbol and using IFFTIt is numbered in cell groupGenerate three groups of drops
The local time domain reference signal of the lower PSS of sampling, generation the specific steps are：1. basisValue 0,1 and 2, be calculated three
The length of group frequency domain primary synchronization signal sequence, frequency domain primary synchronization signal sequence is 62；2. by three groups of frequency domain primary synchronization signal sequences
It is respectively mapped to before and after direct current subcarrier on each 31 subcarriers；3. being mended before primary synchronization signal subcarrier
A zero, behind mendA zero, remove progress after frequency processingPoint IFFT transformation,Expression rounds up,Indicate downward rounding；
3.2) by the local time domain reference signal of three groups of down-sampled lower PSS respectively with it is down-sampled in step 2) after baseband signal do
Related operation is slided, obtains the local time domain reference signal of three groups of down-sampled lower PSS with baseband signal in each possible time
The correlation of synchronous point finds out maximum related value in the correlation of be possible to time synchronization point, and maximum related value is corresponding
Time synchronization point is the timing position of down-sampled lower PSS, is denoted as tcoarse, the corresponding group number of maximum related value is cell group
Interior number；
4) calculating of first diameter and initial timing positions deviation
4.1) according to the non-down-sampled lower points N for generating OFDM symbol and using IFFT in step 2)IFFTAnd determined in step 3)
Number in cell group, generates the local time domain reference signal of non-down-sampled lower PSS, generation the specific steps are：1. according to step
3) frequency domain primary synchronization signal sequence is calculated in number in the cell group determined in, and the length of frequency domain primary synchronization signal sequence is
62；2. obtained frequency domain primary synchronization signal sequence is mapped to before and after direct current subcarrier on each 31 subcarriers；3. in main synchronization
It is mended before channel distortion experiencedA zero, behind mendA zero, remove progress NIFFT after frequency processing
Point IFFT transformation,Expression rounds up,Indicate downward rounding；
4.2) timing position of the down-sampled lower PSS obtained according to step 3) determines the timing position of non-down-sampled lower PSS, with
N forward centered on the positiong·NIFFTA sampled point in/(2 × 2048), N heregIndicate Normal under 20MHz channel widths
The length of CP, value 144, backward 32NIFFTSearch window 1 is arranged in/2048 sampled points, and step 1) is calculated in search window 1
In filtered baseband signal and non-down-sampled lower PSS local time domain reference signal correlation, find out the maximum of correlation
Value P0, and using the corresponding position of the maximum value as starting point, forward trace Ng·NIFFTA sampled point in/(4 × 2048) is searched for
Then window 2 finds first in search window 2 and is more than or equal to β P0Correlation, wherein β be corresponding threshold value, β ∈ (0,
1], the position of diameter, is denoted as t headed by the position of the sampled point corresponding to the correlation isfirst, can then obtain first diameter with it is initial
Deviation delta between timing position is：
Δ=tfirst-tcoarse·NdownSam；
5) adjustment of down-sampled lower PSS timing positions
According to the deviation between step 4) the first diameter calculated and initial timing positions to the PSS timing positions under down-sampled
tcoarseIt is adjusted, it is assumed that the down-sampled lower PSS timing positions after adjusting are tc′oarse, then the principle adjusted is：
Wherein, ‖ expressions take absolute value,Indicate that downward rounding, sign () indicate the sign of round numbers；
6) SSS is synchronized
The down-sampled lower PSS timing positions t calculated according to step 5)c′oarseAnd the relative position relation of PSS and SSS comes
It determines the position where SSS, the synchronization of SSS is carried out after extraction SSS to obtain cell group number and frame timing, in conjunction with step
3) number can calculate cell ID in the cell group obtained in；
Above-mentioned LTE is expressed as long term evolution, PSS is expressed as primary synchronization signal, OFDM is expressed as orthogonal frequency division multiplexing, IFFT tables
It is shown as fast fourier inverse transformation, SSS is expressed as secondary synchronization signal.
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| CN107241794B (en) * | 2017-06-30 | 2021-05-28 | 西安宇飞电子技术有限公司 | Rapid synchronous tracking method and device for TDD-OFDM downlink |
| CN107124243B (en) * | 2017-07-03 | 2019-01-15 | 深圳国人通信股份有限公司 | A kind of method and device for realizing that TDD-LTE is synchronous |
| CN110113801B (en) * | 2018-02-01 | 2020-12-18 | 华为技术有限公司 | Cell residence method and device |
| CN113595954B (en) * | 2021-08-04 | 2023-06-20 | 重庆邮电大学 | PSS timing synchronization detection method based on piecewise differential algorithm |
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