CN109150784A - A kind of frequency deviation estimating method and device - Google Patents
A kind of frequency deviation estimating method and device Download PDFInfo
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- CN109150784A CN109150784A CN201710509604.2A CN201710509604A CN109150784A CN 109150784 A CN109150784 A CN 109150784A CN 201710509604 A CN201710509604 A CN 201710509604A CN 109150784 A CN109150784 A CN 109150784A
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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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
- H04L27/266—Fine or fractional frequency offset determination and synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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Abstract
The embodiment of the invention provides a kind of frequency deviation estimating method and device, which includes: to carry out smart offset estimation to the upstream data received, to obtain the first offset estimation value；The first offset estimation value is mapped according to predetermined mapping algorithm, to obtain the second offset estimation value corresponding with the first offset estimation value；According to the first offset estimation value and the second offset estimation value, frequency deviation compensation deals are carried out to upstream data；According to frequency deviation compensation deals as a result, selecting target offset estimation value corresponding with upstream data from the first offset estimation value and the second offset estimation value.To improve the precision of frequency offset estimation result, meanwhile, by the offset estimation demand for the terminal high-speeds mobile context such as expanding the estimation range of frequency offset estimation result, and then meet high-speed rail.
Description
Technical field
The present embodiments relate to the communications field more particularly to a kind of frequency deviation estimating methods and device.
Background technique
In LTE mobile communication system, Doppler shift, which will lead to, receives signal frequency variation, to cause to receive signal
Phase changes.Frequency offset estimation technique, which refers to, goes out offset estimation value by the phase difference estimation using content identical data,
First by this part, frequency deviation is compensated before solution constellation point, so that effectively avoiding constellation point from rotating influences uplink service
Demodulation performance achievees the purpose that the demodulation performance for promoting uplink service.
The realization of offset estimation is generally divided into two kinds at present: one is coarse frequency offsets, another is smart offset estimation.
Coarse frequency offset is estimated using the cyclic prefix CP of same row pilot tone, and each sample in same row frequency pilot sign is mainly utilized
Phase difference between value point, obtains offset estimation value.An OFDM symbol as shown in Figure 1:, cyclic prefix B are the numbers of symbol tail portion
It is moved according to A and arrives head, the content of B and part A is completely the same.Coarse frequency offset utilizes the cyclic prefix of a column pilot tone and one
The phase difference between data A after symbol lengths, to obtain offset estimation value.
Smart offset estimation is then to carry out offset estimation using the phase difference of two column pilot tones, mainly utilizes two column frequency pilot signs
Between phase difference between each sample point.It is as shown in Figure 2: in a LTE radio frames, the pilot signal DMRS of preceding field and later half
The DMRS content of frame is identical, and time domain differs 0.5ms, can be calculated by the phase difference between the DMRS of former and later two fields
Obtain smart offset estimation value.
Frequency deviation estimating method in the prior art is usually to use: first carrying out coarse frequency offset, does essence again on this basis
Offset estimation, final offset estimation value are thick frequency deviation+essence frequency deviation.Concrete methods of realizing is as follows:
(1) after 0 pilot tone of sub-frame of uplink time slot carries out channel estimation process, frequency deviation is carried out to the frequency pilot sign of time slot 0 and is estimated
Meter, obtains the coarse frequency offset value f of the subframe1。
(2) after the pilot tone of time slot 1 carries out channel estimation, the phase of thick frequency deviation is compensated the pilot channel estimation of time slot 1
Difference, compensation result and the pilot channel estimation of time slot 0 are done related, obtain smart offset estimation value f2。
(3) final offset estimation value is f=f1+f2。
But due to wireless channel space-multipath effect, it will cause the presence of intersymbol interference, before coarse frequency offset utilizes
Sew and the signal of symbol tail portion carries out offset estimation, influence affected by inter-symbol interference, will lead to that estimated accuracy is low, and error is big etc. asks
Topic.
In addition, traditional smart offset estimation is carried out using two column pilot tones, two column pilot tone time domain intervals are 0.5ms, that is, are sampled
Between be divided into 0.5ms, so frequency offset estimation range be -1000Hz~+1000Hz.Current high-speed rail speed per hour is corresponded in 300km or so
1.9GHz frequency point is calculated referring to following formula, and the frequency deviation value of uplink signal is 1055Hz.Therefore under high-speed rail scene, if
Smart offset estimation is only used, frequency offset estimation range -1000Hz~+1000Hz is not able to satisfy the demand of current high-speed rail movement speed,
It is poor to will also result in uplink decoding performance.
F/fc=v/c
To sum up, it in the frequency deviation estimating method of the prior art, since the frequency offset error of coarse frequency offset is big, will lead to final
Frequency deviation result inaccuracy, also, the restriction of the estimation range due to smart offset estimation causes smart offset estimation that can not be applied to
Under the mobile scene of the terminal high-speeds such as high-speed rail, high speed, the uplink demodulation performance of whole system is caused to be affected.
In view of the above-mentioned problems, currently no effective solution has been proposed.
Summary of the invention
The embodiment of the present invention provides a kind of frequency deviation estimating method and device, is estimated with solving the frequency deviation estimating method of the prior art
The problem of it is low to calculate precision, and the application scenarios such as high-speed rail can not be applied to.
To solve the above-mentioned problems, the invention discloses a kind of frequency deviation estimating methods, which comprises
Smart offset estimation is carried out to the upstream data received, to obtain the first offset estimation value；
The first offset estimation value is mapped according to predetermined mapping algorithm, it is corresponding with the first offset estimation value to obtain
Second offset estimation value；
According to the first offset estimation value and the second offset estimation value, frequency deviation compensation deals are carried out to upstream data；
According to frequency deviation compensation deals as a result, from the first offset estimation value and selection and upstream data in the second offset estimation value
Corresponding target offset estimation value.
In a preferred embodiment of the invention, the first offset estimation value is mapped according to predetermined mapping algorithm
The step of before further comprise:
If the modulus value of the first offset estimation value is less than or equal to predetermined threshold, it is determined that the first offset estimation value is target frequency deviation
Estimated value；
If the modulus value of the first offset estimation value is greater than predetermined threshold, according to predetermined mapping algorithm to the first offset estimation value
It is mapped.
In a preferred embodiment of the invention, the first offset estimation value is reflected according to predetermined mapping algorithm
Penetrate, with obtain with the first offset estimation value corresponding second offset estimation value the step of, specifically include:
If the first offset estimation value is positive value, the second offset estimation value be the first offset estimation value and predetermined mapping value it
Difference；
If the first offset estimation value is negative value, the second offset estimation value be the first offset estimation value and predetermined mapping value it
With.
In a preferred embodiment of the invention, according to the first offset estimation value and the second offset estimation value, to upper
Row data carry out the step of frequency deviation compensation deals, specifically include:
According to the first offset estimation value, frequency deviation compensation deals are carried out to upstream data, after obtaining frequency deviation compensation deals
First offset data；
According to the second offset estimation value, frequency deviation compensation deals are carried out to upstream data, after obtaining frequency deviation compensation deals
Second offset data；
Demodulation coding processing is carried out to the first offset data, to obtain the first decoding value；
Demodulation coding processing is carried out to the second offset data, to obtain the second decoding value.
In a preferred embodiment of the invention, according to frequency deviation compensation deals as a result, from the first offset estimation value with
The step of target offset estimation value corresponding with upstream data is selected in second offset estimation value, specifically includes:
According to predetermined checking algorithm, the first decoding value and the second decoding value are verified respectively；
According to check results, mesh corresponding with upstream data is selected from the first offset estimation value and the second offset estimation value
Mark offset estimation value.
In a preferred embodiment of the invention, according to check results, from the first offset estimation value and the second frequency deviation
The step of target offset estimation value corresponding with upstream data is selected in estimated value, specifically includes:
If the first check value that the first decoding value exports after verifying is predetermined check value, also, the second decoding value is through school
The second check value exported after testing is predetermined check value, then selects the first offset estimation value and any in the second offset estimation value
Offset estimation value is as target offset estimation value；
If the first check value and the second check value are non-predetermined check value, the first offset estimation value and the second frequency are selected
Any offset estimation value in inclined estimated value is as target offset estimation value；
If the first check value or the second check value are predetermined check value, selection check value is corresponding to predetermined check value
Offset estimation value is as target offset estimation value.
According to another aspect of the present invention, a kind of frequency deviation estimation device is provided, comprising:
Smart frequency deviation estimating modules are estimated for carrying out smart offset estimation to the upstream data received with obtaining the first frequency deviation
Evaluation；
Mapping block, for mapping according to predetermined mapping algorithm the first offset estimation value, to obtain and the first frequency
The corresponding second offset estimation value of inclined estimated value；
Frequency offset compensation block, for carrying out frequency to upstream data according to the first offset estimation value and the second offset estimation value
Offset compensation processing；
Selecting module, for foundation frequency deviation compensation deals as a result, from the first offset estimation value and the second offset estimation value
Select target offset estimation value corresponding with upstream data.
In a preferred embodiment of the invention, device further comprises:
Determining module, if the modulus value for the first offset estimation value is less than or equal to predetermined threshold, it is determined that the first frequency deviation is estimated
Evaluation is target offset estimation value；
If the modulus value that mapping block is further used for the first offset estimation value is greater than predetermined threshold, calculated according to predetermined mapping
Method maps the first offset estimation value.
In a preferred embodiment of the invention, mapping block is further used for:
If the first offset estimation value is positive value, the second offset estimation value be the first offset estimation value and predetermined mapping value it
Difference；
If the first offset estimation value is negative value, the second offset estimation value be the first offset estimation value and predetermined mapping value it
With.
In a preferred embodiment of the invention, frequency offset compensation block is further used for:
According to the first offset estimation value, frequency deviation compensation deals are carried out to upstream data, after obtaining frequency deviation compensation deals
First offset data；
According to the second offset estimation value, frequency deviation compensation deals are carried out to upstream data, after obtaining frequency deviation compensation deals
Second offset data；
Demodulation coding processing is carried out to the first offset data, to obtain the first decoding value；
Demodulation coding processing is carried out to the second offset data, to obtain the second decoding value.
In a preferred embodiment of the invention, selecting module is further used for:
According to predetermined checking algorithm, the first decoding value and the second decoding value are verified respectively；
According to check results, mesh corresponding with upstream data is selected from the first offset estimation value and the second offset estimation value
Mark offset estimation value.
In a preferred embodiment of the invention, selecting module is further used for:
If the first check value that the first decoding value exports after verifying is predetermined check value, also, the second decoding value is through school
The second check value exported after testing is predetermined check value, then selects the first offset estimation value and any in the second offset estimation value
Offset estimation value is as target offset estimation value；
If the first check value and the second check value are non-predetermined check value, the first offset estimation value and the second frequency are selected
Any offset estimation value in inclined estimated value is as target offset estimation value；
If the first check value or the second check value are predetermined check value, selection check value is corresponding to predetermined check value
Offset estimation value is as target offset estimation value.
Compared with prior art, by carrying out smart offset estimation to the upstream data that receives in the present invention, to obtain the
One offset estimation value；The first offset estimation value is mapped according to predetermined mapping algorithm, to obtain and the first offset estimation value
Corresponding second offset estimation value；According to the first offset estimation value and the second offset estimation value, frequency deviation benefit is carried out to upstream data
Repay processing；According to frequency deviation compensation deals as a result, from the first offset estimation value and selection and upstream data in the second offset estimation value
Corresponding target offset estimation value.To improve the precision of frequency offset estimation result, meanwhile, by expanding frequency offset estimation result
Estimation range, and then the offset estimation demand for the terminal high-speeds mobile context such as meet high-speed rail.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is one of the frequency deviation compensation schematic diagram in prior embodiment；
Fig. 2 is two of the frequency deviation compensation schematic diagram in prior embodiment；
Fig. 3 is a kind of flow chart of frequency deviation estimating method of the embodiment of the present invention；
Fig. 4 is the mapping range schematic diagram of the embodiment of the present invention；
Fig. 5 is a kind of structural block diagram of frequency deviation estimation device of the embodiment of the present invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Referring to Fig. 3, a kind of flow chart of frequency deviation estimating method of the embodiment of the present invention is shown, this method is applied to base
It stands, can specifically include following steps:
Step 301, smart offset estimation is carried out to the upstream data received, to obtain the first offset estimation value.
Specifically, in an embodiment of the present invention, base station receives the upstream data for carrying out self terminal.In the embodiment of the present invention
Frequency deviation estimating method is preferably applied under the terminal high-speeds mobile context such as high-speed rail.For other scenes, if not considering to calculate complicated
In the case where degree, the frequency deviation estimating method in the embodiment of the present invention can also be used.
In an embodiment of the present invention, base station carries out smart offset estimation, smart offset estimation step to the upstream data received
Suddenly identical as in prior embodiment, it does not repeat herein.After base station carries out smart offset estimation to upstream data, first is obtained
Offset estimation value.
Step 302, the first offset estimation value is mapped according to predetermined mapping algorithm, to obtain and the first offset estimation
It is worth corresponding second offset estimation value.
Specifically, in an embodiment of the present invention, to expand frequency offset estimation range, base station carries out smart frequency offset estimation range
Continuation is recycled, mapping range corresponding with former range is obtained.For example: former essence frequency offset estimation range be -1000Hz~+
The frequency offset estimation range is carried out circulation continuation by 1000Hz, base station, specific: base station by former smart frequency deviation region to positive value direction with
Negative value direction extends 2000Hz respectively.Therefore, in positive value direction mapping range corresponding with former essence frequency offset estimation range are as follows:
1000Hz~3000Hz, in negative value direction mapping range corresponding with former essence frequency offset estimation range are as follows: -3000Hz~-1000Hz.
As shown in Figure 4.But, it is contemplated that actual demand, under the high-speed mobile scenes such as high-speed rail, former frequency offset estimation range only needs continuation
To ± 2000Hz, meanwhile, former frequency deviation region continuation to ± 2000Hz be can effectively reduce into subsequent offset estimation and calculated again
Miscellaneous degree.
In an embodiment of the present invention, base station maps the first offset estimation value, obtains and the first frequency offset estimation
It is worth corresponding second offset estimation value.Specifically, numerical characteristic of the base station according to the first offset estimation value itself, by the first frequency
Inclined estimated value is mapped in corresponding mapping range, to obtain the second offset estimation value.Specific mapping method will be following
It is described in detail in embodiment.
Step 303, according to the first offset estimation value and the second offset estimation value, upstream data is carried out at frequency deviation compensation
Reason.
Specifically, in an embodiment of the present invention, base station is according to the first offset estimation value and the second offset estimation value, to upper
Row data carry out frequency deviation twice and compensate.
Step 304, according to frequency deviation compensation deals as a result, from the first offset estimation value and the second offset estimation value selection with
The corresponding target offset estimation value of upstream data.
Specifically, in an embodiment of the present invention, base station is according to frequency deviation compensation deals as a result, judging the first offset estimation value
With the accuracy of the second offset estimation value, in one embodiment, in fact it could happen that all inaccurate situation of two offset estimation values,
In another embodiment, in fact it could happen that one of offset estimation value is that accurate situation may be used also In yet another embodiment
Two accurate situations of offset estimation value can occur.Base station is needed according to compensation result, from the first offset estimation value and second
Target offset estimation value corresponding with upstream data is selected in offset estimation value, then the offset estimation is worth corresponding frequency deviation compensation knot
Fruit, as final result.
To sum up, the technical solution in the embodiment of the present invention, by carrying out smart offset estimation to the upstream data received, with
Obtain the first offset estimation value；The first offset estimation value is mapped according to predetermined mapping algorithm, to obtain and the first frequency deviation
The corresponding second offset estimation value of estimated value；According to the first offset estimation value and the second offset estimation value, upstream data is carried out
Frequency deviation compensation deals；According to frequency deviation compensation deals as a result, from the first offset estimation value in the second offset estimation value select with it is upper
The corresponding target offset estimation value of row data.To improve the precision of frequency offset estimation result, meanwhile, by expanding offset estimation
As a result estimation range, and then the offset estimation demand for the terminal high-speeds mobile context such as meet high-speed rail.
In addition, in a preferred embodiment of the invention, according to predetermined mapping algorithm to the first offset estimation value into
Further comprise before the step of row mapping:
If the modulus value of the first offset estimation value is less than or equal to predetermined threshold, it is determined that the first offset estimation value is target frequency deviation
Estimated value；
If the modulus value of the first offset estimation value is greater than predetermined threshold, according to predetermined mapping algorithm to the first offset estimation value
It is mapped.
In a preferred embodiment of the invention, the first offset estimation value is reflected according to predetermined mapping algorithm
Penetrate, with obtain with the first offset estimation value corresponding second offset estimation value the step of, specifically include:
If the first offset estimation value is positive value, the second offset estimation value be the first offset estimation value and predetermined mapping value it
Difference；
If the first offset estimation value is negative value, the second offset estimation value be the first offset estimation value and predetermined mapping value it
With.
In a preferred embodiment of the invention, according to the first offset estimation value and the second offset estimation value, to upper
Row data carry out the step of frequency deviation compensation deals, specifically include:
According to the first offset estimation value, frequency deviation compensation deals are carried out to upstream data, after obtaining frequency deviation compensation deals
First offset data；
According to the second offset estimation value, frequency deviation compensation deals are carried out to upstream data, after obtaining frequency deviation compensation deals
Second offset data；
Demodulation coding processing is carried out to the first offset data, to obtain the first decoding value；
Demodulation coding processing is carried out to the second offset data, to obtain the second decoding value.
In a preferred embodiment of the invention, according to frequency deviation compensation deals as a result, from the first offset estimation value with
The step of target offset estimation value corresponding with upstream data is selected in second offset estimation value, specifically includes:
According to predetermined checking algorithm, the first decoding value and the second decoding value are verified respectively；
According to check results, mesh corresponding with upstream data is selected from the first offset estimation value and the second offset estimation value
Mark offset estimation value.
In a preferred embodiment of the invention, according to check results, from the first offset estimation value and the second frequency deviation
The step of target offset estimation value corresponding with upstream data is selected in estimated value, specifically includes:
If the first check value that the first decoding value exports after verifying is predetermined check value, also, the second decoding value is through school
The second check value exported after testing is predetermined check value, then selects the first offset estimation value and any in the second offset estimation value
Offset estimation value is as target offset estimation value；
If the first check value and the second check value are non-predetermined check value, the first offset estimation value and the second frequency are selected
Any offset estimation value in inclined estimated value is as target offset estimation value；
If the first check value or the second check value are predetermined check value, selection check value is corresponding to predetermined check value
Offset estimation value is as target offset estimation value.
In order to make those skilled in the art better understand frequency deviation estimating method of the invention, below with specific embodiment into
Row elaborates.
1. calculating offset estimation value f (the first offset estimation value i.e. in the embodiment of the present invention)
In an embodiment of the present invention, base station receives the upstream data for carrying out self terminal.Frequency deviation in the embodiment of the present invention is estimated
Meter method is preferably applied under the terminal high-speeds mobile context such as high-speed rail.For other scenes, if not considering the feelings of computation complexity
Under condition, the frequency deviation estimating method in the embodiment of the present invention can also be used.
In an embodiment of the present invention, base station carries out smart offset estimation, smart offset estimation step to the upstream data received
Suddenly identical as in prior embodiment, it does not repeat herein.After base station carries out smart offset estimation to upstream data, first is obtained
Offset estimation value f.
2. judging whether the modulus value of f is greater than threshold value ft(predetermined threshold i.e. in the embodiment of the present invention)
In a preferred embodiment of the invention, to reduce computational complexity, it can prejudge whether f value is greater than door
Limit value is determined whether using the compensation twice and two-way parallel processing plan in the embodiment of the present invention.In reality of the invention
It applies in example, predetermined threshold ftSize, can be configured according to actual needs, which is not limited by the present invention.
Specifically, if the modulus value of the first offset estimation value f | f | it is less than or equal to predetermined threshold ft, it is determined that the first frequency deviation is estimated
Evaluation f is target offset estimation value.That is, base station carries out frequency deviation compensation according only to the first offset estimation value f, to upstream data.
If the modulus value of the first offset estimation value f | f | it is greater than predetermined threshold ft, then according to predetermined mapping algorithm to the first frequency deviation
Estimated value f is mapped.Enter step 3, i.e. mapping step in the embodiment of the present invention.
3. judging whether the first offset estimation value f is more than or equal to 0
Specifically, in an embodiment of the present invention, to expand frequency offset estimation range, base station carries out smart frequency offset estimation range
Continuation is recycled, mapping range corresponding with former range is obtained.
Specifically, in the present embodiment, former essence frequency offset estimation range is -1000Hz~+1000Hz, and the frequency deviation is estimated in base station
Meter range carries out circulation continuation, specific: base station extends former smart frequency deviation region to positive value direction respectively with negative value direction
2000Hz.Therefore, in positive value direction mapping range corresponding with former essence frequency offset estimation range are as follows: 1000Hz~3000Hz, negative
It is worth direction mapping range corresponding with former essence frequency offset estimation range are as follows: -3000Hz~-1000Hz.As shown in Figure 4.But consider
To actual demand, under the high-speed mobile scenes such as high-speed rail, former frequency offset estimation range only needs continuation to ± 2000Hz, together
When, former frequency deviation region continuation to ± 2000Hz be can effectively reduce into subsequent offset estimation computation complexity.
Then, in the mapping process to the first offset estimation value, it need to judge whether the first offset estimation value is positive, it can be true
Mapping range corresponding in the first offset estimation value is made, and obtains corresponding second offset estimation value fm。
In the embodiment of the present invention, predetermined mapping value is 2000Hz.
If the first offset estimation value f is greater than 0, as positive value, then with first again and again partially the corresponding mapping range of estimated value be-
2000Hz~-1000Hz.Second offset estimation value fmFor the difference of the first offset estimation value and predetermined mapping value, that is, fm=f-
2000。
Conversely, if the first offset estimation value less than 0, as negative value, then mapping range corresponding with the first offset estimation value
For 1000Hz~2000Hz.Second offset estimation value fmFor the sum of the first offset estimation value and predetermined mapping value, that is, fm=f+
2000。
4. respectively according to f and fmFrequency deviation compensation is carried out to upstream data.
Specifically, in an embodiment of the present invention, base station carries out frequency deviation benefit according to the first offset estimation value, to upstream data
Processing is repaid, to obtain the first offset data after frequency deviation compensation deals.
According to the second offset estimation value, frequency deviation compensation deals are carried out to upstream data, after obtaining frequency deviation compensation deals
Second offset data.
5. checking treatment
To obtain target offset estimation value, the base station in the embodiment of the present invention need to carry out the first, second offset estimation value
Verification.It is specific:
Base station carries out demodulation coding processing to the first offset data, to obtain the first decoding value；
And demodulation coding processing is carried out to the second offset data, to obtain the second decoding value.
According to predetermined checking algorithm, the first decoding value and the second decoding value are verified respectively, in one embodiment,
Checking algorithm can be school CRC (cyclic redundancy check, Cyclic Redundancy Check) in prior embodiment
It tests, which is not limited by the present invention.
6. selection target offset estimation value
Specifically, in an embodiment of the present invention, if the first check value that the first decoding value exports after verifying is predetermined
Check value, also, the second check value that the second decoding value exports after verifying is predetermined check value, then selects the first offset estimation
Value is with any offset estimation value in the second offset estimation value as target offset estimation value.It is preferred real at of the invention one
Apply in example, the first decoding value and the second decoding value it is correct export predetermined check value in the case where, preferential the first frequency of selection
Inclined estimated value is target offset estimation value.
If the first check value and the second check value are non-predetermined check value, the first offset estimation value and the second frequency are selected
Any offset estimation value in inclined estimated value is as target offset estimation value.In a preferred embodiment of the invention, exist
First decoding value and the equal mistake of the second decoding value, that is, it is preferential to select the first offset estimation in the case where exporting non-predetermined check value
Value is target offset estimation value.
If the first check value or the second check value are predetermined check value, selection check value is corresponding to predetermined check value
Offset estimation value is as target offset estimation value.
In conclusion the technical solution in the embodiment of the present invention, is estimated by carrying out smart frequency deviation to the upstream data received
Meter, to obtain the first offset estimation value；The first offset estimation value is mapped according to predetermined mapping algorithm, to obtain and first
Offset estimation is worth corresponding second offset estimation value；According to the first offset estimation value and the second offset estimation value, to upstream data
Carry out frequency deviation compensation deals；According to frequency deviation compensation deals as a result, being selected from the first offset estimation value and the second offset estimation value
Target offset estimation value corresponding with upstream data.To improve the precision of frequency offset estimation result, meanwhile, by expanding frequency deviation
The estimation range of estimated result, and then the offset estimation demand for the terminal high-speeds mobile context such as meet high-speed rail.
Referring to Fig. 5, a kind of structural block diagram of frequency deviation estimation device of the embodiment of the present invention is shown, which specifically can be with
It comprises the following modules:
Smart frequency deviation estimating modules 501, for carrying out smart offset estimation to the upstream data received, to obtain the first frequency deviation
Estimated value；
Mapping block 502, for mapping according to predetermined mapping algorithm the first offset estimation value, to obtain and first
Offset estimation is worth corresponding second offset estimation value；
Frequency offset compensation block 503, for being carried out to upstream data according to the first offset estimation value and the second offset estimation value
Frequency deviation compensation deals；
Selecting module 504, for foundation frequency deviation compensation deals as a result, from the first offset estimation value and the second offset estimation value
It is middle to select target offset estimation value corresponding with upstream data.
In a preferred embodiment of the invention, device further comprises:
Determining module (not shown), if the modulus value for the first offset estimation value is less than or equal to predetermined threshold, really
Fixed first offset estimation value is target offset estimation value；
If the modulus value that mapping block 502 is further used for the first offset estimation value is greater than predetermined threshold, reflected according to predetermined
Algorithm is penetrated to map the first offset estimation value.
In a preferred embodiment of the invention, mapping block 502 is further used for:
If the first offset estimation value is positive value, the second offset estimation value be the first offset estimation value and predetermined mapping value it
Difference；
If the first offset estimation value is negative value, the second offset estimation value be the first offset estimation value and predetermined mapping value it
With.
In a preferred embodiment of the invention, frequency offset compensation block 503 is further used for:
According to the first offset estimation value, frequency deviation compensation deals are carried out to upstream data, after obtaining frequency deviation compensation deals
First offset data；
According to the second offset estimation value, frequency deviation compensation deals are carried out to upstream data, after obtaining frequency deviation compensation deals
Second offset data；
Demodulation coding processing is carried out to the first offset data, to obtain the first decoding value；
Demodulation coding processing is carried out to the second offset data, to obtain the second decoding value.
In a preferred embodiment of the invention, selecting module is further used for:
According to predetermined checking algorithm, the first decoding value and the second decoding value are verified respectively；
According to check results, mesh corresponding with upstream data is selected from the first offset estimation value and the second offset estimation value
Mark offset estimation value.
In a preferred embodiment of the invention, selecting module 504 is further used for:
If the first check value that the first decoding value exports after verifying is predetermined check value, also, the second decoding value is through school
The second check value exported after testing is predetermined check value, then selects the first offset estimation value and any in the second offset estimation value
Offset estimation value is as target offset estimation value；
If the first check value and the second check value are non-predetermined check value, the first offset estimation value and the second frequency are selected
Any offset estimation value in inclined estimated value is as target offset estimation value；
If the first check value or the second check value are predetermined check value, selection check value is corresponding to predetermined check value
Offset estimation value is as target offset estimation value.
In conclusion the device in the embodiment of the present invention, by carrying out smart offset estimation to the upstream data received, with
Obtain the first offset estimation value；The first offset estimation value is mapped according to predetermined mapping algorithm, to obtain and the first frequency deviation
The corresponding second offset estimation value of estimated value；According to the first offset estimation value and the second offset estimation value, upstream data is carried out
Frequency deviation compensation deals；According to frequency deviation compensation deals as a result, from the first offset estimation value in the second offset estimation value select with it is upper
The corresponding target offset estimation value of row data.To improve the precision of frequency offset estimation result, meanwhile, by expanding offset estimation
As a result estimation range, and then the offset estimation demand for the terminal high-speeds mobile context such as meet high-speed rail.
For apparatus embodiments, since it is basically similar to the method embodiment, so be described relatively simple, it is related
Place illustrates referring to the part of embodiment of the method.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
The embodiment of the present invention can describe in the general context of computer-executable instructions executed by a computer, example
Such as program module.Generally, program module include routines performing specific tasks or implementing specific abstract data types, program,
Object, component, data structure etc..The present invention can also be practiced in a distributed computing environment, in these distributed computing rings
In border, by executing task by the connected remote processing devices of communication network.In a distributed computing environment, program mould
Block can be located in the local and remote computer storage media including storage equipment.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, commodity or the equipment that include a series of elements not only include that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, commodity or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in process, method, commodity or the equipment for including the element.
A kind of frequency deviation estimating method provided by the present invention is described in detail with device above, it is used herein
A specific example illustrates the principle and implementation of the invention, and the above embodiments are only used to help understand originally
The method and its core concept of invention；At the same time, for those skilled in the art, according to the thought of the present invention, specific
There will be changes in embodiment and application range, in conclusion the content of the present specification should not be construed as to of the invention
Limitation.
Claims (12)
1. a kind of frequency deviation estimating method characterized by comprising
Smart offset estimation is carried out to the upstream data received, to obtain the first offset estimation value；
The first offset estimation value is mapped according to predetermined mapping algorithm, to obtain and the first offset estimation value pair
The the second offset estimation value answered；
According to the first offset estimation value and the second offset estimation value, the upstream data is carried out at frequency deviation compensation
Reason；
According to the frequency deviation compensation deals as a result, from the first offset estimation value and the second offset estimation value selection with
The corresponding target offset estimation value of the upstream data.
2. the method according to claim 1, wherein described estimate first frequency deviation according to predetermined mapping algorithm
Further comprise before the step of evaluation is mapped:
If the modulus value of the first offset estimation value is less than or equal to predetermined threshold, it is determined that the first offset estimation value is described
Target offset estimation value；
If the modulus value of the first offset estimation value is greater than the predetermined threshold, according to predetermined mapping algorithm to first frequency
Inclined estimated value is mapped.
3. the method according to claim 1, wherein described estimate first frequency deviation according to predetermined mapping algorithm
Evaluation is mapped, with obtain with the first offset estimation value corresponding second offset estimation value the step of, specifically include:
If the first offset estimation value is positive value, the second offset estimation value is the first offset estimation value and makes a reservation for
The difference of mapping value；
If the first offset estimation value be negative value, the second offset estimation value be the first offset estimation value with it is described
The sum of predetermined mapping value.
4. the method according to claim 1, wherein described according to the first offset estimation value and described second
Offset estimation value, to the upstream data carry out frequency deviation compensation deals the step of, specifically include:
According to the first offset estimation value, frequency deviation compensation deals are carried out to the upstream data, to obtain frequency deviation compensation deals
The first offset data afterwards；
According to the second offset estimation value, frequency deviation compensation deals are carried out to the upstream data, to obtain frequency deviation compensation deals
The second offset data afterwards；
Demodulation coding processing is carried out to first offset data, to obtain the first decoding value；
Demodulation coding processing is carried out to second offset data, to obtain the second decoding value.
5. according to the method described in claim 4, it is characterized in that, it is described according to the frequency deviation compensation deals as a result, from described
Target offset estimation value corresponding with the upstream data is selected in first offset estimation value and the second offset estimation value
Step specifically includes:
According to predetermined checking algorithm, first decoding value and second decoding value are verified respectively；
According to check results, selection and the upstream data from the first offset estimation value and the second offset estimation value
Corresponding target offset estimation value.
6. according to the method described in claim 5, it is characterized in that, described according to check results, from first offset estimation
The step of target offset estimation value corresponding with the upstream data is selected in value and the second offset estimation value, it is specific to wrap
It includes:
If the first check value that first decoding value exports after verifying is predetermined check value, also, second decoding value
The second check value exported after verifying is the predetermined check value, then selects the first offset estimation value and second frequency
Any offset estimation value in inclined estimated value is as the target offset estimation value；
If first check value and second check value are non-predetermined check value, the first offset estimation value is selected
With any offset estimation value in the second offset estimation value as the target offset estimation value；
If first check value or second check value are predetermined check value, selection check value is right for predetermined check value
The offset estimation value answered is as target offset estimation value.
7. a kind of frequency deviation estimation device characterized by comprising
Smart frequency deviation estimating modules, for carrying out smart offset estimation to the upstream data received, to obtain the first offset estimation value；
Mapping block, for mapping according to predetermined mapping algorithm the first offset estimation value, to obtain and described the
One offset estimation is worth corresponding second offset estimation value；
Frequency offset compensation block is used for according to the first offset estimation value and the second offset estimation value, to the upper line number
According to progress frequency deviation compensation deals；
Selecting module is used for according to the frequency deviation compensation deals as a result, from the first offset estimation value and second frequency deviation
Target offset estimation value corresponding with the upstream data is selected in estimated value.
8. device according to claim 7, which is characterized in that described device further comprises:
Determining module, if the modulus value for the first offset estimation value is less than or equal to predetermined threshold, it is determined that first frequency
Inclined estimated value is the target offset estimation value；
If the modulus value that the mapping block is further used for the first offset estimation value is greater than the predetermined threshold, according to pre-
Determine mapping algorithm to map the first offset estimation value.
9. device according to claim 7, which is characterized in that the mapping block is further used for:
If the first offset estimation value is positive value, the second offset estimation value is the first offset estimation value and makes a reservation for
The difference of mapping value；
If the first offset estimation value be negative value, the second offset estimation value be the first offset estimation value with it is described
The sum of predetermined mapping value.
10. device according to claim 7, which is characterized in that the frequency offset compensation block is further used for:
According to the first offset estimation value, frequency deviation compensation deals are carried out to the upstream data, to obtain frequency deviation compensation deals
The first offset data afterwards；
According to the second offset estimation value, frequency deviation compensation deals are carried out to the upstream data, to obtain frequency deviation compensation deals
The second offset data afterwards；
Demodulation coding processing is carried out to first offset data, to obtain the first decoding value；
Demodulation coding processing is carried out to second offset data, to obtain the second decoding value.
11. device according to claim 10, which is characterized in that the selecting module is further used for:
According to predetermined checking algorithm, first decoding value and second decoding value are verified respectively；
According to check results, selection and the upstream data from the first offset estimation value and the second offset estimation value
Corresponding target offset estimation value.
12. device according to claim 11, which is characterized in that the selecting module is further used for:
If the first check value that first decoding value exports after verifying is predetermined check value, also, second decoding value
The second check value exported after verifying is the predetermined check value, then selects the first offset estimation value and second frequency
Any offset estimation value in inclined estimated value is as the target offset estimation value；
If first check value and second check value are non-predetermined check value, the first offset estimation value is selected
With any offset estimation value in the second offset estimation value as the target offset estimation value；
If first check value or second check value are predetermined check value, selection check value is right for predetermined check value
The offset estimation value answered is as target offset estimation value.
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