CN107404447A - Frequency bias compensation method, device and terminal under IA High Speed Channel connected state - Google Patents
Frequency bias compensation method, device and terminal under IA High Speed Channel connected state Download PDFInfo
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- CN107404447A CN107404447A CN201610334851.9A CN201610334851A CN107404447A CN 107404447 A CN107404447 A CN 107404447A CN 201610334851 A CN201610334851 A CN 201610334851A CN 107404447 A CN107404447 A CN 107404447A
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- frequency deviation
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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
- H04L25/0202—Channel estimation
- H04L25/0222—Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency
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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
Abstract
Frequency bias compensation method, device and terminal under a kind of IA High Speed Channel connected state, the frequency bias compensation method include：The offset estimation value of the offset estimation value of present sub-frame and the previous subframe of the present sub-frame is obtained, and calculates the difference of the offset estimation value of the present sub-frame and the offset estimation value of the previous subframe；When the difference shows that the terminal is among two neighboring base station, control pause compensates Doppler shift of the terminal in the present sub-frame.Technical solution of the present invention improves channel estimating performance, so as to improve the throughput of terminal.
Description
Technical field
The present invention relates to a kind of compensation of the frequency deviation under communication technical field, more particularly to IA High Speed Channel connected state
Method, apparatus and terminal.
Background technology
In two-way SFN (Single Frequency Network, SFN) IA High Speed Channel (for example, high ferro
Dedicated channel) under, automatic frequency control (Automatic Frequency Control, AFC) loop meeting one
Straight row voltage controlled oscillator (Voltage-Controlled Oscillator, VCO)/numerically-controlled oscillator
The compensation of (Numerically Controlled Oscillator, NCO).
But when user equipment (User Equipment, UE) is among two base stations, two-way SFN
Channel includes two footpaths, when user equipment is among two base stations, the Doppler frequency shift in two footpaths
(Doppler shift) is equal in magnitude but in opposite direction, if AFC is gone to compensate VCO with estimated total frequency deviation,
One of Doppler shift compensation can so be fallen in (the stronger footpath of corresponding energy), then during channel estimation
The Doppler frequency shift in two footpaths now estimates obtained doppler values also very little with regard to asymmetric.Cell is special
It is selectable how general during with reference signal (Cell-specific Reference Signal, CRS) progress channel estimation
It is smaller to strangle gear so that the window of time-domain filtering is very narrow, influences the performance of CRS channel estimations, so as to
Influence the throughput of terminal.
The content of the invention
Present invention solves the technical problem that being how to improve CRS channel estimating performances, handling up for terminal is improved
Rate.
In order to solve the above technical problems, the embodiment of the present invention provides the frequency deviation under a kind of IA High Speed Channel connected state
Compensation method, for terminal, the frequency bias compensation method under IA High Speed Channel connected state includes：Obtain current son
The offset estimation value of the offset estimation value of frame and the previous subframe of the present sub-frame, and calculate described current
The difference of the offset estimation value of subframe and the offset estimation value of the previous subframe；When the difference table
When the bright terminal is among two neighboring base station, control pause compensates the terminal in the current son
The Doppler shift of frame.
Optionally, the frequency bias compensation method also includes：Based on the CRS symbol meters in the present sub-frame
Doppler's estimate is calculated, Doppler's estimate is used to carry out channel estimation, wherein, the Doppler
Estimate is representing the size of the Doppler shift.
Optionally, included based on CRS sign computation Doppler's estimates in the present sub-frame：According to
Multiple doppler values in setting range, time-domain filtering is carried out to the CRS symbols；Calculate time-domain filtering
The error of the front and rear CRS symbols, it is determined that the doppler values corresponding to the minimum error are described
Doppler's estimate.
Optionally, obtaining the offset estimation value of the previous subframe of present sub-frame and the present sub-frame includes：
Calculate the phase offset between multiple CRS symbols in same subframe, calculate the phase offset with it is described more
The ratio of time interval between individual CRS symbols, to obtain the offset estimation value.
Optionally, when the absolute value of the difference reaches the first setting value, show that the terminal is in adjacent
Among two base stations.
Optionally, the frequency bias compensation method also includes：The absolute value of the difference is less than the second setting value
Number when reaching given threshold, control compensates Doppler shift of the terminal in the present sub-frame.
Optionally, control pause is accomplished by the following way and compensates the terminal in the more of the present sub-frame
General Le frequency deviation：Adjust voltage controlled oscillator and/or numerically-controlled oscillator.
Optionally, the frequency bias compensation method also includes：To the terminal the present sub-frame temperature
Frequency deviation compensates.
In order to solve the above technical problems, the embodiment of the invention also discloses under a kind of IA High Speed Channel connected state
Frequency deviation compensation device, for terminal, the frequency deviation compensation device includes：Computing unit, work as suitable for obtaining
The offset estimation value of the offset estimation value of preceding subframe and the previous subframe of the present sub-frame, and described in calculating
The difference of the offset estimation value of present sub-frame and the offset estimation value of the previous subframe；Control unit,
Described in when the difference shows that the terminal is among two neighboring base station, control pause compensates
Doppler shift of the terminal in the present sub-frame.
Optionally, the frequency deviation compensation device also includes：Estimation unit, suitable for based on the present sub-frame
Interior CRS sign computation Doppler's estimates, Doppler's estimate are used to carry out channel estimation, its
In, Doppler's estimate is representing the size of the Doppler shift.
Optionally, the estimation unit includes：Filtering subunit, suitable for according to multiple in setting range
Doppler values, time-domain filtering is carried out to the CRS symbols；Doppler's estimate determination subelement, is suitable to
The error of the CRS symbols before and after calculating time-domain filtering, it is determined that described more corresponding to the minimum error
Pu Le values are Doppler's estimate.
Optionally, the computing unit calculates the phase offset between multiple CRS symbols in same subframe,
The ratio of the time interval between the phase offset and the multiple CRS symbols is calculated, it is described to obtain
Offset estimation value.
Optionally, when the absolute value of the difference reaches the first setting value, show that the terminal is in adjacent
Among two base stations.
Optionally, the absolute value of described control unit difference is less than the number of the second setting value in the difference
Absolute value be less than the number of the second setting value when reaching given threshold, control compensates the terminal described
The Doppler shift of present sub-frame.
Optionally, control pause is accomplished by the following way and compensates the terminal in the more of the present sub-frame
General Le frequency deviation：Adjust voltage controlled oscillator and/or numerically-controlled oscillator.
Optionally, described control unit includes：Warm offset compensation subelement, suitable for the terminal described
The temperature frequency deviation of present sub-frame compensates.
In order to solve the above technical problems, the embodiment of the invention also discloses a kind of terminal, the terminal includes
Frequency deviation compensation device under the IA High Speed Channel connected state.
Compared with prior art, the technical scheme of the embodiment of the present invention has the advantages that：
The embodiment of the present invention is by obtaining the offset estimation value of present sub-frame and the previous son of the present sub-frame
The offset estimation value of frame, and calculate the described of the offset estimation value of the present sub-frame and the previous subframe
The difference of offset estimation value, for judging the position of terminal；When the difference shows that the terminal is in phase
When among adjacent two base stations, control pause compensates Doppler shift of the terminal in the present sub-frame.
By adjusting frequency deviation compensation policy of the terminal under IA High Speed Channel connected state, i.e., when terminal is in two neighboring
During the centre position of base station, pause compensates Doppler shift of the terminal in the present sub-frame.Can be real
Accurate Doppler shift is now estimated, so that when channel estimation can select suitable window function progress
Domain filters, and the performance of channel estimation is lifted, so as to ensure the stability of Throughput.
Furthermore, according to multiple doppler values in setting range, when being carried out to the CRS symbols
Domain filters；The error of the CRS symbols before and after calculating time-domain filtering, it is determined that the minimum error is corresponding
The doppler values be Doppler's estimate.Using multiple doppler values pair in setting range
CRS symbols carry out time-domain filtering, it is determined that the doppler values corresponding to the minimum error are Doppler
Estimate, the accuracy of Doppler's estimate can be further improved, so as to further lift channel
The performance of estimation, ensure the stability of Throughput.
Brief description of the drawings
Fig. 1 is the flow chart of the frequency bias compensation method under a kind of IA High Speed Channel connected state of the embodiment of the present invention；
Fig. 2 is the flow chart of the frequency bias compensation method under another kind IA High Speed Channel connected state of the embodiment of the present invention；
Fig. 3 is the structural representation of the frequency deviation compensation device under a kind of IA High Speed Channel connected state of the embodiment of the present invention
Figure；
Fig. 4 is that the structure of the frequency deviation compensation device under another kind IA High Speed Channel connected state of the embodiment of the present invention is shown
It is intended to.
Embodiment
As described in the background art, two-way SFN channels include two footpaths, when user equipment is in two bases
When among standing, the Doppler frequency shift in two footpaths is equal in magnitude but in opposite direction, if estimated by AFC use
Total frequency deviation goes to compensate VCO, then can fall one of Doppler shift compensation and (it is stronger correspond to energy
Footpath), then with regard to asymmetric, how general now estimation obtain the Doppler frequency shift in two footpaths during channel estimation
Le value also very little.Cell special reference (Cell-specific Reference Signal, CRS) carries out channel
Selectable Doppler's gear is smaller during estimation so that the window of time-domain filtering is very narrow, influences CRS letters
The performance of road estimation, so as to influence the throughput of terminal.
Technical solution of the present invention can be used for the scene that terminal is among two neighboring base station, also due to this
When terminal it is equal in magnitude relative to two Doppler frequency shifts of two neighboring base station, symbol is opposite, it is necessary to estimate
Count Doppler frequency shift and carry out channel estimation.Wherein, the terminal is among two neighboring base station and referred to
Terminal is equal or of substantially equal with the distance of two base stations, such as terminal and the distance difference of two base stations exist
In predetermined threshold value, the predetermined threshold value can be set according to actual conditions.
IA High Speed Channel alleged by the embodiment of the present invention can be the high ferro dedicated channel for high ferro scene, or
Other any channels that can be used for High-speed Circumstance.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings
The specific embodiment of the present invention is described in detail.
Fig. 1 is the flow chart of the frequency bias compensation method under a kind of IA High Speed Channel connected state of the embodiment of the present invention.
The specific steps of the frequency bias compensation method under the IA High Speed Channel connected state are done with reference to Fig. 1 detailed
Explanation.
Step S101：Obtain the frequency of the offset estimation value of present sub-frame and the previous subframe of the present sub-frame
Inclined estimate, and the frequency deviation for calculating the offset estimation value and the previous subframe of the present sub-frame is estimated
The difference of evaluation.
In the present embodiment, in subframe the presence of frequency deviation can cause the different time interval in same frequency resource
Data produce phase offset, specifically, the presence of frequency deviation can cause between the different sampled points in subframe
Produce phase offset.Doppler shift in subframe can pass through offset estimation value (Frequency Offset
Estimation, FOE) represent.
In specific implementation, the phase offset between multiple CRS symbols in same subframe is calculated, described in calculating
The ratio of time interval between phase offset and the multiple CRS symbols, to obtain the offset estimation
Value.That is, the phase place change on same subcarrier between front and rear distinct symbols can be weighed, so as to
To offset estimation value.
For example, by taking 4 CRS symbols as an example, equation below can be used by calculating offset estimation value：
Wherein, CorrSum_Rx0 represents phase offset of 4 CRS symbols in antenna port 0；
CorrSum_Rx1 represents phase offset of 4 CRS symbols in antenna port 1；NRB represents resource block
Number；NTx represents the number of transmitting antenna；VRS (0, nTx, 3, i) is four-dimensional array, represents CRS
The estimate obtained by frequency domain interpolation, 0 represents reception antenna in array, and nTx represents transmitting antenna, 3
Symbol is represented, i represents subcarrier；VRS (0, nTx, 1, i), VRS (1, nTx, 3, i), VRS (1, nTx, 1, i) is with this
Analogize.
CorrSum=α × CorrSumRx0+(1-α)×CorrSum_Rx1；
Wherein, CorrSum represents the phase offset total amount between 4 CRS symbols；δRX1Represent antenna
The received signal to noise ratio of port 1, δRX0Represent the received signal to noise ratio of antenna port 0.
FOE=a × tan (imag (CorrSum), real (CorrSum))/2 π × 4 × Tsymbol.
Wherein, FOE represents offset estimation value, and a represents to merge the factor；Before Tsymbol represents normal circulation
The duration for the single symbol sewed.
Step S102：When the difference shows that the terminal is among two neighboring base station, control is temporary
Stop compensating Doppler shift of the terminal in the present sub-frame.
In specific implementation, when terminal (User Equipment, UE) is among two neighboring base station, also
It is to say, when terminal is in equal or of substantially equal with the distance of two neighboring base station, multiple offset estimation values
Between changes in amplitude it is big.Therefore it can be estimated by the frequency deviation of the offset estimation value and previous subframe of present sub-frame
Whether the difference of evaluation determines the position of terminal, that is, determine terminal among two neighboring base station.
In specific implementation, when the absolute value of the difference reaches the first setting value, show that the terminal is in
Among two neighboring base station.For example, first setting value can be 250Hz.
It is understood that the size of first setting value can be fitted according to the application environment of reality
The adjustment of answering property, the embodiment of the present invention are without limitation.
In specific implementation, when terminal is among two neighboring base station, control pause compensates the terminal and existed
Doppler (Doppler) frequency deviation of the present sub-frame, the duration of pause can enter according to actual conditions
Row setting, after this duration restoration and compensation again.Specifically, can be accomplished by the following way
Control pause compensates Doppler shift of the terminal in the present sub-frame：Adjust voltage controlled oscillator
(Voltage-Controlled Oscillator, VCO) and/or numerically-controlled oscillator (Numerically
Controlled Oscillator,NCO).Specifically, terminal includes Doppler's frequency in the frequency deviation of present sub-frame
Inclined and temperature frequency deviation, compensated by the temperature frequency deviation only obtained to estimation, so as to realize pause compensation
Doppler shift.For example, (Automatic Frequency Control, AFC) can be controlled by automatic frequency
Loop adjusts voltage controlled oscillator and/or numerically-controlled oscillator.
Specifically, under IA High Speed Channel, with UE motion, the symbol of Doppler shift can occur from
Negative cyclically-varying is just arrived, and temperature frequency deviation is its average value.Specifically, automatic frequency can be passed through
Control (Automatic Frequency Control, AFC) loop output based on the method for moving average come
Estimate temperature frequency deviation.When terminal is in cell switching position, it may not be necessary to which temperature frequency deviation is compensated.
For example, definition set S1 and S2 first, represents that AFC loop output frequencies belong to just how general respectively
Le value and bear doppler values.Assuming that the length of moving average is L, f is AFC loop output frequencies, then counts
Calculate the average value of positive doppler values：F1_avg=(f1 (i-L+1)+f1 (i-n+2)+...+f1 (i))/L, wherein, f1 (i)
Represent the interior AFC loops output frequencies on i-th of symbol of set S1；The average value of negative doppler values：
F2_avg=(f2 (i-L+1)+f2 (i-n+2)+...+f2 (i))/L, wherein, f2 (i) is represented in set S2 at i-th
AFC loops output frequency on symbol, then temperature frequency deviation is the average value of positive doppler values and negative doppler values
Average value average F_avg=(F1_avg+F2_avg)/2.
For example, it is assumed that TH0 and TH1 are respectively the judgment threshold of frequency deviation set, f (i) belongs to S2, if
(f(i+1)-f(i))>TH0, then f (i+1) belong to S1；If abs (f (i+1)-f (i))<TH1, then f (i+1)
Belong to S2；Otherwise, f (i+1) is in cell switching position, it is not necessary to moving average is carried out, that is, without
The compensation of temperature frequency deviation.If setting f (i) belongs to S1, if (f (i+1)-f (i))<- TH0, then f (i+1) belong to
In S2；If abs (f (i+1)-f (i))<TH1, then f (i+1) belong to S1；Otherwise, f (i+1) is in cell
Switching position, it is not necessary to moving average is carried out, that is, the compensation without temperature frequency deviation.
It should be noted that the length of moving average, the judgment threshold TH0 and TH1 of frequency deviation set can be with
The configuration and adjustment of adaptability are carried out according to the application environment of reality, the embodiment of the present invention is without limitation.
It is described based on CRS sign computation Doppler's estimates in the present sub-frame in specific implementation
Doppler's estimate is used to carry out channel estimation.Specifically, can be according to multiple more in setting range
Pu Le values, time-domain filtering is carried out to the CRS symbols；The CRS symbols before and after calculating time-domain filtering
Error, it is determined that the doppler values corresponding to the minimum error are Doppler's estimate.
Specifically, (the example when absolute value of the difference reaches given threshold less than the number of the second setting value
Such as can be 5 times), control compensates Doppler shift of the terminal in the present sub-frame.That is,
The absolute value of the offset estimation value of present sub-frame and the difference of the offset estimation value of previous subframe is set less than second
When the number of definite value reaches given threshold, show that terminal is not among base station, then can now control benefit
Doppler shift of the terminal in present sub-frame is repaid, terminal can be now selected with terminal apart from small base station.
It should be noted that the size of given threshold and the second setting value can be according to the application environment of reality
The adjustment of adaptability is carried out, the embodiment of the present invention is without limitation.
Fig. 2 is the flow chart of the frequency bias compensation method under another kind IA High Speed Channel connected state of the embodiment of the present invention.
The specific steps of the frequency bias compensation method under the IA High Speed Channel connected state are done with reference to Fig. 2 detailed
Explanation.
Step S201：The phase offset between multiple CRS symbols in same subframe is calculated, calculates the phase
The ratio of time interval between position skew and the multiple CRS symbols, to obtain the offset estimation value.
In specific implementation, its frequency can be determined based on phase offset between multiple CRS symbols in same subframe
Inclined estimate, offset estimation value is determined for terminal whether among base station, and then can determine
Whether the compensation of Doppler shift is carried out.That is, front and rear different symbols on same subcarrier can be weighed
Phase place change between number, so as to obtain offset estimation value.
Step S202：Obtain the frequency of the offset estimation value of present sub-frame and the previous subframe of the present sub-frame
Inclined estimate, and the frequency deviation for calculating the offset estimation value and the previous subframe of the present sub-frame is estimated
The difference of evaluation.
Step S203：When the absolute value of the difference reaches the first setting value, control pause compensates the end
Hold the Doppler shift in the present sub-frame.
In specific implementation, when terminal is among two neighboring base station, terminal is relative to two neighboring base station
Doppler shift it is equal in magnitude, symbol on the contrary, now between terminal adjacent sub-frame offset estimation value fluctuation
It is larger, thus, it is possible to the frequency for the offset estimation value and the previous subframe for passing through the present sub-frame
Whether the difference of inclined estimate judges terminal among base station.Specifically, the absolute value of difference reaches
During one setting value, for example, 250Hz, shows that the offset estimation value fluctuation between adjacent sub-frame is larger, shows institute
Terminal is stated to be among two neighboring base station.
Specifically, when terminal is among two neighboring base station, control pause compensates the terminal in institute
The Doppler shift of present sub-frame is stated, temperature frequency deviation of the terminal in the present sub-frame is compensated.
Because temperature frequency deviation is compensated, and Doppler shift is not compensated for, and therefore, now the CRS in subframe is accorded with
Doppler shift is only existed between number, so as to which wider symmetrical time domain window can be selected to enter when road is estimated
Row filtering.It should be noted that in order to simpler and clearly state problem, the present embodiment is not examined
Consider the frequency deviation composition beyond temperature frequency deviation and Doppler shift.In fact, if other kinds of frequency deviation,
It may be otherwise and continue to compensate these frequency deviations, only suspend the compensation to Doppler shift.
Step S204：When the number that the absolute value of the difference is less than the second setting value reaches given threshold,
Control compensates Doppler shift of the terminal in the present sub-frame.
In specific implementation, when the absolute value of difference reaches given threshold less than the number of the second setting value, example
Such as, 5 times, show that the offset estimation value fluctuation between adjacent sub-frame is smaller, it is adjacent to show that the terminal is not in
Among two base stations, at this point it is possible to control the Doppler shift for compensating the terminal in the present sub-frame.
It should be noted that the size of first setting value and the given threshold can be according to reality
Application environment carries out the adjustment of adaptability, and the embodiment of the present invention is without limitation.
Step S205：According to multiple doppler values in setting range, time domain is carried out to the CRS symbols
Filtering.
In specific implementation, through step S203, after determining that terminal is in two neighboring base station centre, Ke Yigen
Channel estimation is carried out according to Doppler shift.Doppler shift can be represented with Doppler's estimate.Specifically,
Based on CRS sign computation Doppler's estimates in the present sub-frame, Doppler's estimate is used for
Carry out channel estimation.
Step S206：The error of the CRS symbols before and after calculating time-domain filtering, it is determined that the minimum mistake
The doppler values corresponding to difference are Doppler's estimate.
Specifically, can according to multiple doppler values in setting range, for example, 100Hz to 1000Hz,
Multiple time-domain filtering is carried out to CRS symbols.If the error of the CRS symbols is minimum before and after time-domain filtering,
The Doppler shift of doppler values and the CRS symbols is of substantially equal corresponding to showing, thus, it is possible to will
The doppler values corresponding to the minimum error are Doppler's estimate.
It is understood that the setting range can carry out the tune of adaptability according to the application environment of reality
Whole, the embodiment of the present invention is without limitation.
For example, select one group of CRS symbol (such as can be 5 symbols (symbol)) first, according to setting
Determine the interior doppler values gear number of scope (such as 100Hz~1000Hz) (such as 10 grades), Mei Geduo
The general corresponding doppler values of Le gear, each Doppler's gear designs one group of time domain filter coefficients, right
CRS symbols carry out time-domain filtering.Utilize the CRS sign computation mean square errors (Mean before and after time-domain filtering
Squared Error MSE), you can 10 MSE are obtained, each MSE corresponds to Doppler's gear value,
Choose Doppler estimate of the minimum Doppler's gears of MSE as current this group of CRS symbol.Wherein,
Doppler's estimate is mapped as to be used for channel estimation after Doppler's gear.In channel estimation, channel
Estimate that (Channel Estimation, CE) selects the coefficient of time domain interpolation (filtering) according to Doppler's gear.
The performance of channel estimation is lifted, so as to CE best performance, so as to ensure that throughput will not decline, is handled up
Rate improves.
For example, it is also possible to be, two-way SFN (Single Frequency Network, SFN) is believed at a high speed
Doppler shift reports maximum Doppler gear to select maximum gear to CE, CE up to 1000Hz under road
Time domain interpolation coefficient carry out time-domain filtering, CE selects the time domain interpolation coefficient of maximum gear to carry out time domain filter
Ripple, the performance of channel estimation is lifted, so that CE best performance, so as to ensure that throughput will not decline,
Throughput improves.
The embodiment of the embodiment of the present invention can refer to foregoing corresponding embodiment, and here is omitted.
Fig. 3 is the structural representation of the frequency deviation compensation device under a kind of IA High Speed Channel connected state of the embodiment of the present invention
Figure.The frequency deviation compensation device 30 under IA High Speed Channel connected state is described in detail with reference to Fig. 3.
Frequency deviation compensation device 30 under IA High Speed Channel connected state includes computing unit 301 and control unit 302.
Wherein, computing unit 301 is suitable to obtain the offset estimation value of present sub-frame and the present sub-frame
The offset estimation value of previous subframe, and calculate the offset estimation value of the present sub-frame and the previous subframe
The offset estimation value difference；Control unit 302 is suitable to show that the terminal is in the difference
When among two neighboring base station, control pause compensates Doppler shift of the terminal in the present sub-frame.
In specific implementation, the phase offset between multiple CRS symbols in same subframe is calculated, described in calculating
The ratio of time interval between phase offset and the multiple CRS symbols, to obtain the offset estimation
Value.That is, the phase place change on same subcarrier between front and rear distinct symbols can be weighed, so as to
To offset estimation value.
In specific implementation, when terminal is among two neighboring base station, that is to say, that terminal and adjacent two
When the distance of individual base station is equal or substantially suitable, the changes in amplitude between multiple offset estimation values is big.It is therefore logical
The difference of the offset estimation value of present sub-frame and the offset estimation value of previous subframe is crossed, can determine terminal
Position, that is, determine terminal whether among two neighboring base station.Terminal is in two neighboring base station
When middle, control pause compensates Doppler (Doppler) frequency deviation of the terminal in the present sub-frame.Tool
For body, control pause can be accomplished by the following way and compensate the terminal in the more of the present sub-frame
General Le frequency deviation：Adjust voltage controlled oscillator and/or numerically-controlled oscillator.
In specific implementation, terminal includes Doppler shift and temperature frequency deviation in the frequency deviation of present sub-frame.Terminal
When among two neighboring base station, temperature frequency deviation of the terminal in the present sub-frame is compensated.
Doppler shift is so now only existed in present sub-frame, after estimating Doppler shift, channel
Estimation can select wider time-domain filtering window according to Doppler's estimate.
The embodiment of the embodiment of the present invention can refer to foregoing corresponding embodiment, and here is omitted.
Fig. 4 is that the structure of the frequency deviation compensation device under another kind IA High Speed Channel connected state of the embodiment of the present invention is shown
It is intended to.The frequency deviation compensation device 40 under IA High Speed Channel connected state is described in detail with reference to Fig. 4.
Frequency deviation compensation device 40 under IA High Speed Channel connected state includes computing unit 301, control unit 302
With estimation unit 402；Wherein control unit 302 includes warm offset compensation subelement 401, estimation unit 402
Including filtering subunit 403 and Doppler's estimate determination subelement 404.
Wherein, computing unit 301 is suitable to obtain the offset estimation value of present sub-frame and the present sub-frame
The offset estimation value of previous subframe, and calculate the offset estimation value of the present sub-frame and the previous subframe
The offset estimation value difference；Control unit 302 is suitable to show that the terminal is in the difference
When among two neighboring base station, control pause compensates Doppler shift of the terminal in the present sub-frame.
Specifically, warm offset compensation subelement 401 be suitable to the terminal the present sub-frame temperature
Frequency deviation compensates.Specifically, terminal includes Doppler shift and temperature frequency deviation in the frequency deviation of present sub-frame.
When terminal is among two neighboring base station, warm offset compensation subelement 401 is to the terminal described current
The temperature frequency deviation of subframe compensates.Doppler shift is so now only existed in present sub-frame, to more
When general Le frequency deviation is estimated, the accuracy of estimation can be improved.For example, automatic frequency control can be passed through
The output of loop processed estimates temperature frequency deviation based on the method for moving average.When terminal is in cell toggle bit
When putting, warm offset compensation subelement 401 may not necessarily compensate to temperature frequency deviation.
In specific implementation, filtering subunit 403 is suitable to according to multiple doppler values in setting range, right
The CRS symbols carry out time-domain filtering；Doppler's estimate determination subelement 404 is suitable to calculate time domain filter
The error of the CRS symbols after wavefront, it is determined that the doppler values corresponding to the minimum error are institute
State Doppler's estimate.
The embodiment of the embodiment of the present invention can refer to foregoing corresponding embodiment, and here is omitted.
The embodiment of the invention also discloses a kind of terminal, the terminal is included under above-mentioned IA High Speed Channel connected state
Frequency deviation compensation device 30 and IA High Speed Channel connected state under frequency deviation compensation device 40.The terminal refers to can
With the computer equipment for using, communicating on the move, including but not limited to mobile phone, notebook, flat board electricity
The equipment such as brain and vehicle-mounted computer.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment
Suddenly it is that by program the hardware of correlation can be instructed to complete, the program can be stored in can with computer
Read in storage medium, storage medium can include：ROM, RAM, disk or CD etc..
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art,
Without departing from the spirit and scope of the present invention, can make various changes or modifications, therefore the guarantor of the present invention
Shield scope should be defined by claim limited range.
Claims (17)
- A kind of 1. frequency bias compensation method under IA High Speed Channel connected state, for terminal, it is characterised in that including：The offset estimation value of the offset estimation value of present sub-frame and the previous subframe of the present sub-frame is obtained, and Calculate the difference of the offset estimation value of the present sub-frame and the offset estimation value of the previous subframe；When the difference shows that the terminal is among two neighboring base station, control pause compensates the end Hold the Doppler shift in the present sub-frame.
- 2. frequency bias compensation method according to claim 1, it is characterised in that also include：Based on CRS sign computation Doppler's estimates in the present sub-frame, Doppler's estimate is used In carrying out channel estimation, wherein, Doppler's estimate is representing the big of the Doppler shift It is small.
- 3. frequency bias compensation method according to claim 2, it is characterised in that described based on the current son CRS sign computation Doppler's estimates in frame include：According to multiple doppler values in setting range, time-domain filtering is carried out to the CRS symbols；The error of the CRS symbols before and after calculating time-domain filtering, it is determined that described corresponding to the minimum error Doppler values are Doppler's estimate.
- 4. frequency bias compensation method according to claim 1, it is characterised in that it is described acquisition present sub-frame and The offset estimation value of the previous subframe of the present sub-frame includes：Calculate the phase offset between multiple CRS symbols in same subframe, calculate the phase offset with it is described The ratio of time interval between multiple CRS symbols, to obtain the offset estimation value.
- 5. frequency bias compensation method according to claim 1, it is characterised in that the absolute value of the difference reaches During to the first setting value, show that the terminal is among two neighboring base station.
- 6. frequency bias compensation method according to claim 5, it is characterised in that also include：When the number that the absolute value of the difference is less than the second setting value reaches given threshold, described in control compensation Doppler shift of the terminal in the present sub-frame.
- 7. frequency bias compensation method according to claim 1, it is characterised in that control is accomplished by the following way System pause compensates Doppler shift of the terminal in the present sub-frame：Adjust voltage controlled oscillator and/ Or numerically-controlled oscillator.
- 8. according to the frequency bias compensation method described in any one of claim 1 to 7, it is characterised in that also include：Temperature frequency deviation of the terminal in the present sub-frame is compensated.
- A kind of 9. frequency deviation compensation device under IA High Speed Channel connected state, for terminal, it is characterised in that including：Computing unit, suitable for obtaining the offset estimation value of present sub-frame and the previous subframe of the present sub-frame Offset estimation value, and calculate the offset estimation value of the present sub-frame and the frequency of the previous subframe The difference of inclined estimate；Control unit, suitable for when the difference shows that the terminal is among two neighboring base station, controlling Pause compensates Doppler shift of the terminal in the present sub-frame.
- 10. frequency deviation compensation device according to claim 9, it is characterised in that also include：Estimation unit, it is described suitable for based on CRS sign computation Doppler's estimates in the present sub-frame Doppler's estimate is used to carry out channel estimation, wherein, Doppler's estimate is representing described The size of Doppler shift.
- 11. frequency deviation compensation device according to claim 10, it is characterised in that the estimation unit includes：Filtering subunit, suitable for according to multiple doppler values in setting range, being carried out to the CRS symbols Time-domain filtering；Doppler's estimate determination subelement, suitable for calculate time-domain filtering before and after the CRS symbols error, It is determined that the doppler values corresponding to the minimum error are Doppler's estimate.
- 12. frequency deviation compensation device according to claim 9, it is characterised in that the computing unit calculates same Phase offset in one subframe between multiple CRS symbols, calculate the phase offset with it is the multiple The ratio of time interval between CRS symbols, to obtain the offset estimation value.
- 13. frequency deviation compensation device according to claim 9, it is characterised in that the absolute value of the difference reaches During to the first setting value, show that the terminal is among two neighboring base station.
- 14. frequency deviation compensation device according to claim 13, it is characterised in that described control unit difference Absolute value be less than the second setting value number the difference absolute value be less than the second setting value number When reaching given threshold, control compensates Doppler shift of the terminal in the present sub-frame.
- 15. frequency deviation compensation device according to claim 9, it is characterised in that control is accomplished by the following way System pause compensates Doppler shift of the terminal in the present sub-frame：Adjust voltage controlled oscillator and/ Or numerically-controlled oscillator.
- 16. the frequency deviation compensation device according to any one of claim 9 to 15, it is characterised in that the control Unit includes：Warm offset compensation subelement, suitable for being compensated to temperature frequency deviation of the terminal in the present sub-frame.
- 17. a kind of terminal, it is characterised in that connect including the IA High Speed Channel as described in any one of claim 9 to 16 Connect the frequency deviation compensation device under state.
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