CN106506412A - A kind of method and device of offset estimation - Google Patents
A kind of method and device of offset estimation Download PDFInfo
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- CN106506412A CN106506412A CN201510565624.2A CN201510565624A CN106506412A CN 106506412 A CN106506412 A CN 106506412A CN 201510565624 A CN201510565624 A CN 201510565624A CN 106506412 A CN106506412 A CN 106506412A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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Abstract
The invention discloses a kind of method and device of offset estimation, wherein, the method includes：By local pilot data from frequency domain transform to time domain, the pilot data of the time domain that precomputation is obtained and local pilot data carry out related operation, to obtain phase sequence；Determine that phase sequence phase place occurs the sequence points of upset according to the maximum time degree of advance Ta estimated value in current time slots, wherein, Ta estimated values include one below：The Ta estimated values that precomputation is obtained, the history Ta estimated value that effectively safeguards；According to sequence points phase sequence is reconstructed, and to reconstruct after phase sequence carry out offset estimation.By using the present invention, achieve offset estimation well, improve systematic function, solve the problems, such as that prior art not can solve OFDM under LTE system synchronous, especially in frequency hopping and inclined when having big in the case of, it is impossible to the problem that accurate offset estimation is carried out to single frequency pilot sign.
Description
Technical field
The present invention relates to communication field, more particularly to a kind of method and device of offset estimation.
Background technology
The mobile communication system of a new generation requires possess two-forty, spectral efficient, jumbo multimedia number
According to transmittability.In the wireless context, high speed data transfer can produce serious frequency and select row decline, and
OFDM (OFDM, Orthogonal Frequency Division Multiplexing) technology due to
Its advantage for projecting is shown one's talent, and becomes the main flow of LTE (Long Term Evolution, Long Term Evolution)
Technology.
OFDM is the mutually orthogonal Multicarrier Transmission Technology of a sub-carrier, and it is by a wider transmission belt
Width is divided into mutually orthogonal multiple subcarriers for transmitting data in parallel, and which has the availability of frequency spectrum high, anti-
Multipath fading, realize MIMO (multiple-input and multiple-output, Multiple-Input Multiple-Output) technology
Simple the advantages of.However, due to mutually orthogonal characteristic between OFDM technology requirement subcarrier, to frequency
Partially very sensitive.Although OFDM technology introduces the concept of Cyclic Prefix, inhibit to a certain extent
When impact partially to it, however it is necessary that partially can not be excessive when ensureing, otherwise, data will also be subject to serious dry
Disturb, causing property loss of energy.
Therefore, stationary problem becomes one of OFDM technology key problem, and recent decades, a lot of communication enineers were carried
Go out various synchronous solutions, but, to a certain extent, it is impossible to solve current LTE systems well
The synchronous problems of the lower OFDM of system, especially in frequency hopping and inclined when having big in the case of, it is impossible to single
Frequency pilot sign carries out offset estimation.
Content of the invention
The present invention provides a kind of method and device of offset estimation, can not solve well in order to solve prior art
Certainly synchronous problems of OFDM under LTE system, especially in frequency hopping and inclined when having big in the case of, nothing
Method carries out the problem of offset estimation to single frequency pilot sign.
For solving above-mentioned technical problem, on the one hand, the present invention provides a kind of method of offset estimation, including：
By local pilot data from frequency domain transform to time domain, the pilot data of the time domain that precomputation is obtained and described
Local pilot data carries out related operation, to obtain phase sequence；According to the maximum time in current time slots
Degree of advance Ta estimated values determine that the phase sequence phase place occurs the sequence points of upset, wherein, the Ta
Estimated value includes one below：The Ta estimated values that precomputation is obtained, the history Ta estimated value that effectively safeguards；
According to the sequence points phase sequence is reconstructed, and to reconstruct after phase sequence carry out frequency deviation
Estimate.
Further, determine that the phase sequence phase place occurs upset according to the Ta estimated values in current time slots
Sequence points include：The sequence points L is determined according to equation below：Wherein, M
For the length of the phase sequence, TO is Ta estimated values, and unit is Ts, and n is represented to calculating L-value
Correction value, N be system in Fourier inversion points.
Further, determine that the phase sequence phase place occurs upset according to the Ta estimated values in current time slots
Sequence points include：According to the Ta granularities in default Ta estimated values and sequence points table to described current
Ta estimated values in time slot carry out Conversion of measurement unit, to obtain the default Ta estimated values and sequence points table
Present in Ta index values；The default Ta estimated values and sequence of points are searched by the Ta index values
Number table, to determine the sequence points.
Further, according to the sequence points phase sequence is reconstructed including：According to the sequence
There is the position of the sequence of points of upset in the positive and negative determination of points；Predetermined process is carried out to the sequence of points that upset occurs,
With the phase sequence after being reconstructed.
Further, the predetermined process at least includes one below：By the sequence of points that upset occurs directly from institute
State in phase sequence and cut out；The phase place of the sequence of points that upset occurs is compensated；Side using cyclic shift
There is the sequence of points of upset in formula process.
On the other hand, the present invention provides a kind of device of offset estimation, including：Processing module, for incite somebody to action this
The pilot data on ground from frequency domain transform to time domain, the pilot data of the time domain that precomputation is obtained and described local
Pilot data carry out related operation, to obtain phase sequence；Determining module, for according in current time slots
Maximum time degree of advance Ta estimated value determine that the phase sequence phase place occurs the sequence points of upset, its
In, the Ta estimated values include one below：The Ta estimated values that precomputation is obtained, the history that effectively safeguards
Ta estimated values；Reconstructed module, for being reconstructed to the phase sequence according to sequence points；Frequency deviation
Estimation module, carries out offset estimation for the phase sequence after to reconstruct.
Further, the determining module includes：First determining unit, described for determining according to equation below
Sequence points L：Wherein, M is the length of the phase sequence, and TO is that Ta estimates
Value, unit is Ts, and n represents the correction value to calculating L-value, and N is Fourier inversion point in system
Number.
Further, the determining module includes：Converting unit, for according to default Ta estimated values and sequence
Ta granularities in row points table carry out Conversion of measurement unit to the Ta estimated values in the current time slots, to obtain
The default Ta estimated values and Ta index values present in sequence points table；Second determining unit, is used for
The default Ta estimated values and sequence points table are searched by the Ta index values, to determine the sequence
Points.
Further, the reconstructed module includes：Position determination unit, for just counting according to the sequence
The negative position for determining the sequence of points that upset occurs；Reconfiguration unit, is carried out for the sequence of points to there is upset pre-
Fixed process, with the phase sequence after being reconstructed.
Further, the reconfiguration unit at least includes to the predetermined process of the sequence of points that upset occurs
One below：The sequence of points that upset occurs directly is cut out from the phase sequence；To the sequence that upset occurs
The phase place of row point is compensated；The sequence of points that upset occurs is processed by the way of cyclic shift.
The pilot data and local pilot data of the time domain that precomputation is obtained by the present invention carries out related operation,
To obtain phase sequence, determine that phase place occurs the sequence points of upset further according to Ta estimated values, with to phase place
Sequence is reconstructed, and to reconstruct after phase sequence carry out offset estimation, achieve offset estimation well,
Systematic function is improved, prior art is solved and not can solve OFDM synchronizations under LTE system
Problem, especially in frequency hopping and inclined when having big in the case of, it is impossible to frequency deviation is carried out to single frequency pilot sign and is estimated
The problem of meter.
Description of the drawings
Fig. 1 is the flow chart of the method that embodiment of the present invention frequency deviation is estimated；
Fig. 2 is the structural representation of the device that embodiment of the present invention frequency deviation is estimated；
Fig. 3 is the structural representation of the device reconstructed module that embodiment of the present invention frequency deviation is estimated.
Specific embodiment
In order to solve the problems, such as that prior art not can solve OFDM synchronizations under LTE system, especially
Be in frequency hopping and inclined when having big in the case of, it is impossible to the problem that offset estimation is carried out to single frequency pilot sign,
The invention provides a kind of method and device of offset estimation, below in conjunction with accompanying drawing and embodiment, to this
Bright it is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explaining this
Invention, does not limit the present invention.
A kind of method of offset estimation is embodiments provided, the flow process of the method is as shown in figure 1, bag
Include step S102 to S106：
S102, by local pilot data from frequency domain transform to time domain, the pilot tone of the time domain that precomputation is obtained
Data and local pilot data carry out related operation, to obtain phase sequence；
S104, determines phase sequence phase place according to Ta (maximum time degree of advance) estimated value in current time slots
There are the sequence points of upset, wherein, Ta estimated values include one below：The Ta that precomputation is obtained estimates
Value, the history Ta estimated value that effectively safeguards；
S106, according to sequence points phase sequence is reconstructed, and to reconstruct after phase sequence enter line frequency
Estimate partially.
The pilot data of the time domain that precomputation is obtained by the embodiment of the present invention and local pilot data carry out phase
Computing is closed, phase sequence is obtained, determines that phase place occurs the sequence points of upset further according to Ta estimated values,
To be reconstructed to phase sequence, and to reconstruct after phase sequence carry out offset estimation, achieve well
Offset estimation, improves systematic function, solves prior art and not can solve under LTE system
The synchronous problems of OFDM, especially in frequency hopping and inclined when having big in the case of, it is impossible to single pilot tone is accorded with
Number carry out the problem of offset estimation.
When realizing, determine that phase sequence phase place occurs the sequence of upset according to the Ta estimated values in current time slots
Row points can be determined according to equation below：Wherein, L counts for sequence, and M is
The length of phase sequence, TO are Ta estimated values, and unit is Ts, and n represents the correction to calculating L-value
Value, N are Fourier inversion points in system.
If not calculating by above-mentioned formula and determining sequence points, phase place sequence can also be determined in the following manner
There are the sequence points of upset in row phase place, which realizes that process includes：According to default Ta estimated values and sequence
Ta granularities in points table carry out Conversion of measurement unit to the Ta estimated values in current time slots, default to obtain
Ta estimated values and Ta index values present in sequence points table；Default Ta is searched by Ta index values to estimate
Evaluation and sequence points table, to determine that sequence is counted.
During being reconstructed to phase sequence according to sequence points, which just can be counted according to sequence
The negative position for determining the sequence of points that upset occurs；Predetermined process is carried out to the sequence of points that upset occurs, to obtain
Phase sequence after reconstruct.Wherein, predetermined process at least includes one below：To there is the sequence of points of upset
Directly cut out from phase sequence；The phase place of the sequence of points that upset occurs is compensated；Using cyclic shift
Mode process occur upset sequence of points.
The embodiment of the present invention also provides a kind of device of offset estimation, the structural representation of the device as shown in Fig. 2
Including：Processing module 10, from frequency domain transform to time domain precomputation is obtained for by local pilot data
Time domain pilot data and local pilot data carry out related operation, to obtain phase sequence；Determine mould
Block 20, is coupled with processing module 10, for according to the maximum time degree of advance Ta estimated value in current time slots
Determine that phase sequence phase place occurs the sequence points of upset, wherein, Ta estimated values include one below：Estimated
The Ta estimated values for obtaining, the history Ta estimated value that effectively safeguards；Reconstructed module 30, with determining module
20 couplings, for being reconstructed to phase sequence according to sequence points；Frequency deviation estimating modules 40, with reconstruct
Module 30 is coupled, and carries out offset estimation for the phase sequence after to reconstruct.
Wherein it is determined that module 20 can preferably include：First determining unit, for according to equation below
Determine sequence points L：Wherein, length of the M for phase sequence, TO are estimated for Ta
Value, unit is Ts, and n represents the correction value to calculating L-value, and N is Fourier inversion point in system
Number.
Determining module 20 in the preferred case, can also include：Converting unit, for according to default Ta
Estimated value carries out Conversion of measurement unit with the Ta granularities in sequence points table to the Ta estimated values in current time slots,
To obtain default Ta estimated values with Ta index values present in sequence points table；Second determining unit, with
Converting unit is coupled, for searching default Ta estimated values and sequence points table by Ta index values, with true
Sequencing row points.
The structural representation of above-mentioned reconstructed module 30 is as shown in figure 3, which can also include：Position determination unit
301, there is the position of the sequence of points of upset in the positive and negative determination for being counted according to sequence；Reconfiguration unit 302,
Coupling with position determination unit 301, predetermined process is carried out for the sequence of points to there is upset, to obtain weight
Phase sequence after structure.When realizing, reconfiguration unit at least includes to the predetermined process of the sequence of points that upset occurs
One below：The sequence of points that upset occurs directly is cut out from phase sequence；To the sequence of points that upset occurs
Phase place compensate；The sequence of points that upset occurs is processed by the way of cyclic shift.
Preferred embodiment
In prior art, using single pilot tone or SRS (Sounding Reference Signal, Sounding
Reference Signal) the offset estimation problem that carries out single symbol becomes a difficult point.In order to solve above asking
Topic, the embodiment of the present invention propose a kind of inclined when big in the presence of how to carry out frequency deviation using single symbol
The method of estimation, single symbol time domain offset estimation performance that the current industry of the lifting that the method can be larger is adopted,
In the presence of especially inclined when big.
The method of offset estimation provided in an embodiment of the present invention includes following process：
The first step, using the pilot data for receiving and corresponding channel estimation value, obtains the pilot tone for receiving
Data.
It should be noted that during channel estimation is carried out, needing to eliminate the ICI (sons included in H
Inter-carrier interference, Iter-carrier interference) the impact part disturbed.For the solution of this problem,
ICI interfering energies caused by generally eliminating due to frequency deviation in the noise reduction process of H, or by limiting pilot tone
The corresponding u and v values of sequence, it is ensured that ICI interfering energies are not included in noise window as far as possible
In signal energy, so as to get the channel estimation value H corresponding to user equipment.Using calculated letter
Road estimated value and the pilot data (Y) that receives so as to get the local pilot data for receiving, i.e.,
Second step, is the characteristic of a linear phase in time domain using frequency deviation, calculated above-mentioned reception
The pilot tone frequency domain data for arrivingTime domain is transformed to, and related operation is carried out with the time domain data of local pilot tone, from
And be calculated a phase sequence, i.e.,
It should be noted that when frequency-time domain transformation is carried out, IDFT (Fourier inversion) can be adopted,
Can also be rightAfterbody zero insertion carries out IFFT (fast Fourier transform inverse transformation) conversion, in the process this reality
Apply example and do not do this restriction.In addition, if local pilot frequency sequence TX is frequency domain data, IDFT can be equally adopted
Or the mode conversion time domain of IFFT.
3rd step, the Ta estimated values got using early stage obtain phase bit flipping in phase sequence W
Sequence points.
In the process, can adoptThe points for acquiring that phase place occurs upset are calculated,
Wherein, length of the M for phase sequence, TO is the Ta estimated values for acquiring, and unit is Ts, and n is represented
Value is modified to the L-value for calculating.Therefore, during actual realization, the calculating of L can be adopted
The mode for directly calculating, it would however also be possible to employ precalculated using the formula and obtained by way of tabling look-up.Consideration
To the problem of the complexity that realizes, during actual realization, the granularity of Ta during L is calculated not
Need to be accurate to 1Ts, can calculate according to modes such as 16Ts or 8Ts, here does not do this restriction.
4th step, is reconstructed phase sequence using the L-value for obtaining.If L-value is on the occasion of, then it is assumed that phase place
Point of the last L value of sequence W for generation upset；If L-value negative value, then it is assumed that phase sequence W's
Front L value overturns.
Therefore, for this L phase bit flipping point, can be in the way of using directly cutting out, it would however also be possible to employ follow
The mode of ring displacement, it is also possible to directly the phase place of the L points for overturning is compensated.As for using that scheme
Carry out the process of L-value, the present invention is not limited, it is contemplated that realization simple, it is preferred to use directly intercepting
Mode.For the ease of description the present invention thought, described below during by the way of directly cutting out, i.e.,
The length of the phase sequence W after by cutting out is changed into L1=M-L.In addition, it is necessary to illustrate, it is just
The convenience for calculating later, needs guarantee to cut out rear excess phase sequence L1For even number.
5th step, frequency deviation are linear relations in the phase place that time domain is embodied, hence with phase place sequence
Row W is that linear relation carries out offset estimation with frequency deviation.
The phase contrast or first half and latter half between putting two-by-two can be adopted during realization
Phase contrast or phase sequence is divided into several segments, then calculate the phase contrast two-by-two between segment.
Finally, based on phase contrast described above so as to obtaining final offset estimation value.
Examples below is with using DMRS (demodulation reference signal, Demodulation reference signal)
As a example by pilot frequency sequence carries out the offset estimation of single pilot tone, the such scheme of the present embodiment, above-mentioned side are elaborated
Method can be applied in an ofdm system, and specific implementation step is as follows：
The first step, using the channel estimation value H after the pilot tone frequency domain data Y and noise reduction process for receiving, counts
Calculate the reception frequency domain data of the local pilot tone of the channel effect that is eliminated.For the noise reduction process of channel estimation,
Can be in the way of using time domain noise reduction, it would however also be possible to employ the mode of frequency domain noise reduction, the present invention does not do this restriction.
Related operation is carried out using the pilot tone frequency domain data Y for receiving with channel estimation H after noise reduction, eliminate H
The impact of the pilot tone frequency domain data to receiving, as follows
Second step, using calculated frequency domain dataTransform to frequency domain.In the process, it is contemplated that real
Existing simplicity, in frequency domain pairCarry out the mode of afterbody zero insertion so as to which length is changed into 2n, then to zero insertion
Frequency domain data afterwards carries out IFFT and transforms to time domain；Equally, if local pilot tone frequency domain sequence can also lead to
Cross the time domain of mode conversion as above.The process of implementing includes：
First, using pilot tone frequency domain dataLength M1, after calculating zero insertion, sequence length meets 2nMinimum
Points M2；
Then, using calculated M2To pilot tone frequency domain dataWith local pilot tone frequency domain data (X) tail
Portion carries out zero insertion process so as to which the length after zero insertion meets 2n, i.e.,
Subsequently, using zero insertion after local pilot tone frequency domain data and the pilot tone frequency domain data that receives carry out frequency
Shi Bianhuan, is calculated the time domain number for receiving pilot data and local pilot data respectively using IFFT conversion
According to being expressed as x and Tx.
Finally, correlation is carried out using the time domain of calculated local pilot tone time domain sequences and reception pilot data
Computing, so that get one due to a phase sequence caused by frequency deviation, i.e. W=x Tx*.
, using the effective Ta values of current TTI, there is the phase of upset so as to acquire phase place in the 3rd step
The points of bit sequence.For this process, the present embodiment is illustrated the thought of the present invention in the way of tabling look-up,
Certainly if the selection of the L-value provided in following table is not unique, a correction value, tool can be increased to this value
Body using correction value be how many, the present invention be not limited, can be according to situation be implemented depending on.In addition, table
1 and table 2 provide Ta granularity be the 16Ts (sequence lengths corresponding to L-value in Tables 1 and 2
For 512 points).
Table 1
| Ta(16Ts) | -1 | -2 | -3 | -4 | -5 | -6 | -7 | -8 | -9 |
| L_Neg | -4 | -8 | -12 | -16 | -20 | -24 | -28 | -32 | -36 |
| Ta(16Ts) | -10 | -11 | -12 | -13 | -14 | -15 | -16 | -17 | -18 |
| L_Neg | -40 | -44 | -48 | -52 | -56 | -60 | -64 | -68 | -72 |
Table 2
| Ta(16Ts) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| L_Pos | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | 32 |
| Ta(16Ts) | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| L_Pos | 36 | 40 | 44 | 48 | 52 | 56 | 60 | 64 | 68 |
This step specific operation process includes as follows：
First, arrived and the granularity one corresponding to Tables 1 and 2 using the currently active Ta values conversion for obtaining
The Ta values of cause.It should be noted that this Ta value can also be the instantaneous value that current TTI estimates, estimate
Method can adopt time domain approach, it would however also be possible to employ frequency domain method, here are not limited.In addition, this Ta
Value can also be the effective history value that safeguards.Therefore, using the Ta values for getting, if unit is not 16Ts,
Need to be converted to the Ta values that unit is 16Ts.Such as, the Ta estimated values of current TTI are 160Ts, convert
It is 10 after being 16Ts into unit, it is the L-value corresponding to 10 then to search Ta index values in table 2, i.e.,
L_Pos=40；If the Ta values that estimates are negative value, search in table 1 according to method as above corresponding
Ta index values.
Finally, the L-value using the L-value of above-mentioned acquisition of tabling look-up, corresponding to conversion to currently employed sampling point.
If the M of currently employed calculating2It is worth for 512, then the phase place for directly carrying out below using the L-value of acquisition of tabling look-up
Data sequence is reconstructed；Otherwise, need to arrive current M according to the sequence length conversion corresponding to table2It is worth corresponding L,
I.e.OrFor example, M2The value of value is 256, and effectively Ta values
For 160Ts, then the L-value for being obtained using method as described above is 20.
4th step, is reconstructed phase sequence using above-mentioned calculated L-value.This process mainly
For estimating that the value of the generation phase bit flipping in the phase sequence of frequency deviation finds, this enforcement is turned over directly cutting out this
Phase inversion bit sequence, and offset estimation is carried out using the reproducing sequence cut out after upset phase sequence.Implement
During, if L-value be on the occasion of, illustrate phase sequence W afterbody occur phase bit flipping, then cut out
L point of the afterbody of phase sequence W；If L-value is negative value, illustrate that the head of phase sequence W is sent out
Raw phase bit flipping, then cut out L point of the head of phase sequence W.Such as, obtained according to above-mentioned example
The L-value for taking is 20, then phase sequence W is reconstructed, and generates new phase sequenceI.e.
5th step, carries out offset estimation using above-mentioned reconfigured phase sequence.Carrying out offset estimation
When, phase place average that can be using the phase place average of first half with latter half carries out offset estimation,
Can also using phase sequence individual two-by-two between phase contrast carry out offset estimation.The present embodiment is with using front
The phase place average of half part and latter half carries out offset estimation, i.e.,Wherein, Δ f：
For subcarrier spacing；
Although being example purpose, the preferred embodiments of the present invention are had been disclosed for, those skilled in the art will
Recognize that various improvement, increase and replacement are also possible, therefore, the scope of the present invention should be not limited to
State embodiment.
Claims (10)
1. a kind of method of offset estimation, it is characterised in that include：
By local pilot data from frequency domain transform to time domain, the pilot data of the time domain that precomputation is obtained and
The local pilot data carries out related operation, to obtain phase sequence；
Determine that the phase sequence phase place occurs according to the maximum time degree of advance Ta estimated value in current time slots
The sequence points of upset, wherein, the Ta estimated values include one below：The Ta that precomputation is obtained estimates
Value, the history Ta estimated value that effectively safeguards；
According to the sequence points phase sequence is reconstructed, and to reconstruct after phase sequence carry out
Offset estimation.
2. the method for claim 1, it is characterised in that according to the Ta estimated values in current time slots
Determine that the sequence points that the phase sequence phase place occurs upset include：
The sequence points L is determined according to equation below：Wherein, M is the phase place
The length of sequence, TO are Ta estimated values, and unit is Ts, and n represents the correction value to calculating L-value,
N is Fourier inversion points in system.
3. the method for claim 1, it is characterised in that according to the Ta estimated values in current time slots
Determine that the sequence points that the phase sequence phase place occurs upset include：
According to the Ta granularities in default Ta estimated values and sequence points table to the Ta in the current time slots
Estimated value carries out Conversion of measurement unit, to obtain the default Ta estimated values with Ta present in sequence points table
Index value；
The default Ta estimated values and sequence points table are searched by the Ta index values, described to determine
Sequence is counted.
4. method as claimed any one in claims 1 to 3, it is characterised in that according to the sequence
Points the phase sequence is reconstructed including：
There is the position of the sequence of points of upset in the positive and negative determination according to sequence points；
Predetermined process is carried out to the sequence of points that upset occurs, with the phase sequence after being reconstructed.
5. method as claimed in claim 4, it is characterised in that the predetermined process at least includes following
One of：
The sequence of points that upset occurs directly is cut out from the phase sequence；
The phase place of the sequence of points that upset occurs is compensated；
The sequence of points that upset occurs is processed by the way of cyclic shift.
6. a kind of device of offset estimation, it is characterised in that include：
Processing module, for by local pilot data from frequency domain transform to time domain, by precomputation obtain when
The pilot data in domain and the local pilot data carry out related operation, to obtain phase sequence；
Determining module, for determining the phase according to the maximum time degree of advance Ta estimated value in current time slots
There are the sequence points of upset in bit sequence phase place, wherein, the Ta estimated values include one below：Estimated
The Ta estimated values for obtaining, the history Ta estimated value that effectively safeguards；
Reconstructed module, for being reconstructed to the phase sequence according to sequence points；
Frequency deviation estimating modules, carry out offset estimation for the phase sequence after to reconstruct.
7. device as claimed in claim 6, it is characterised in that the determining module includes：
First determining unit, for determining the sequence points L according to equation below：
Wherein, M is the length of the phase sequence, and TO is Ta estimated values, and unit is Ts, and n is represented to calculating
The out correction value of L-value, N are Fourier inversion points in system.
8. device as claimed in claim 6, it is characterised in that the determining module includes：
Converting unit, for the Ta granularities counted in table according to default Ta estimated values and sequence to described
Ta estimated values in current time slots carry out Conversion of measurement unit, to obtain the default Ta estimated values and sequence of points
Ta index values present in number table；
Second determining unit, for searching the default Ta estimated values and sequence by the Ta index values
Points table, to determine the sequence points.
9. the device as any one of claim 6 to 8, it is characterised in that the reconstructed module
Including：
There is the position of the sequence of points of upset in position determination unit, the positive and negative determination for being counted according to the sequence
Put；
Reconfiguration unit, carries out predetermined process for the sequence of points to there is upset, with the phase place after being reconstructed
Sequence.
10. device as claimed in claim 9, it is characterised in that the reconfiguration unit is turned over to described
The predetermined process of the sequence of points for turning at least includes one below：
The sequence of points that upset occurs directly is cut out from the phase sequence；
The phase place of the sequence of points that upset occurs is compensated；
The sequence of points that upset occurs is processed by the way of cyclic shift.
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| CN201510565624.2A CN106506412A (en) | 2015-09-07 | 2015-09-07 | A kind of method and device of offset estimation |
| PCT/CN2016/080761 WO2017041495A1 (en) | 2015-09-07 | 2016-04-29 | Frequency offset estimation method and apparatus |
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| CN201510565624.2A CN106506412A (en) | 2015-09-07 | 2015-09-07 | A kind of method and device of offset estimation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019029372A1 (en) * | 2017-08-11 | 2019-02-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Method, terminal device and network device for time advance adjustment |
| CN110138415A (en) * | 2019-06-21 | 2019-08-16 | 西安电子科技大学 | The frequency point method of determining interference of frequency hopping communications |
| CN110191074A (en) * | 2018-02-23 | 2019-08-30 | 中兴通讯股份有限公司 | A kind of method and device of data demodulation |
| WO2020177610A1 (en) * | 2019-03-04 | 2020-09-10 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for estimating and compensating timing advance |
| CN113055995A (en) * | 2019-12-26 | 2021-06-29 | 中兴通讯股份有限公司 | Frequency offset estimation method and device |
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| CN112910821B (en) * | 2021-02-01 | 2022-09-13 | 成都爱瑞无线科技有限公司 | Method for increasing carrier frequency offset estimation reliability and estimation range |
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| US9036723B2 (en) * | 2012-09-20 | 2015-05-19 | Nec Laboratories America, Inc. | Full-range pilot-assisted frequency offset estimation for OFDM communication systems |
| CN103929394B (en) * | 2014-04-11 | 2017-04-19 | 西安易晓通讯科技有限公司 | High-precision frequency offset estimation method based on iteration algorithm |
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| US20040203921A1 (en) * | 2003-03-21 | 2004-10-14 | Nicholas Bromhead | Sub-sector timing advance positions determinations |
| CN102546485A (en) * | 2010-12-27 | 2012-07-04 | 中兴通讯股份有限公司 | Frequency deviation estimating method and device |
| CN102571647A (en) * | 2010-12-27 | 2012-07-11 | 中兴通讯股份有限公司 | Frequency offset estimation method and device |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019029372A1 (en) * | 2017-08-11 | 2019-02-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Method, terminal device and network device for time advance adjustment |
| US11284367B2 (en) | 2017-08-11 | 2022-03-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Method, terminal device and network device for time advance adjustment |
| US11523361B2 (en) | 2017-08-11 | 2022-12-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Method, terminal device and network device for time advance adjustment |
| US11974246B2 (en) | 2017-08-11 | 2024-04-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Method, terminal device and network device for time advance adjustment |
| CN110191074A (en) * | 2018-02-23 | 2019-08-30 | 中兴通讯股份有限公司 | A kind of method and device of data demodulation |
| CN110191074B (en) * | 2018-02-23 | 2021-07-02 | 中兴通讯股份有限公司 | Data demodulation method and device |
| WO2020177610A1 (en) * | 2019-03-04 | 2020-09-10 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for estimating and compensating timing advance |
| CN110138415A (en) * | 2019-06-21 | 2019-08-16 | 西安电子科技大学 | The frequency point method of determining interference of frequency hopping communications |
| CN113055995A (en) * | 2019-12-26 | 2021-06-29 | 中兴通讯股份有限公司 | Frequency offset estimation method and device |
| CN113055995B (en) * | 2019-12-26 | 2023-10-27 | 中兴通讯股份有限公司 | Frequency offset estimation method and device |
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