CN109495414A - A kind of frequency deviation estimating method, device, equipment and computer readable storage medium - Google Patents
A kind of frequency deviation estimating method, device, equipment and computer readable storage medium Download PDFInfo
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- CN109495414A CN109495414A CN201710817405.8A CN201710817405A CN109495414A CN 109495414 A CN109495414 A CN 109495414A CN 201710817405 A CN201710817405 A CN 201710817405A CN 109495414 A CN109495414 A CN 109495414A
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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
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
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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
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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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
- H04L27/2659—Coarse or integer 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
- H04L27/26—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
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2671—Time domain
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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
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2672—Frequency domain
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- H—ELECTRICITY
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- 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 present invention provides a kind of frequency deviation estimating method, device, equipment and computer readable storage medium, is related to field of communication technology, to improve the accuracy for carrying out offset estimation under more RRH high-speed rail environment.Frequency deviation estimating method of the invention, comprising: receive the time-domain signal on each diameter that transmitting terminal is sent, and the running time-frequency resource on each diameter is obtained according to the time-domain signal on each diameter；Channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains the channel estimation in frequency domain value on each diameter；According to the channel estimation in frequency domain value on each diameter, the time domain channel estimated value on each diameter is determined；According to the time domain channel estimated value on each diameter, the frequency deviation on each diameter is determined.The accuracy that offset estimation is carried out under more RRH high-speed rail environment can be improved in the present invention.
Description
Technical field
The present invention relates to fields of communication technology more particularly to a kind of frequency deviation estimating method, device, equipment and computer can
Read storage medium.
Background technique
Under high-speed rail, generally by RRH (Remote Radio Unit, remote radio), come realize same cell several
Antenna is disposed along high-speed rail, to increase MPS process, reduces switching frequency to improve network performance.And under normal conditions, in height
Multiple RRH can be set under iron hoop border.Here, the high-speed rail environment with multiple RRH is known as more RRH high-speed rail environment.
But when UE (User Equipment, user equipment) is located among two RRH of same cell, UE can be received
Receptivity is seriously affected to form rapid fading to two opposite signals of (or multiple) Doppler shift.
Carrier frequency offset is mainly caused with the presence of two aspect reasons: first is that the local oscillator frequencies of originator and receiving end
Deviation；Second is that deviation caused by the Doppler frequency shift due to caused by relative motion.
Existing frequency deviation estimating method, OFDM (Orthogonal Frequency Division Multiplexing,
Orthogonal frequency division multiplexing) under system, it is only capable of estimating single frequency deviation Δ f.And under high-speed rail environment, multiple RRH (or a plurality of diameter) can
There can be different frequency deviations, and these different frequency deviations can not be estimated using the prior art, so as to cause existing skill is utilized
The frequency offset estimation result inaccuracy of art.
Summary of the invention
In view of this, the present invention provides a kind of frequency deviation estimating method, device, equipment and computer readable storage medium, use
To improve the accuracy for carrying out offset estimation under more RRH high-speed rail environment.
In order to solve the above technical problems, in a first aspect, the embodiment of the present invention provides a kind of frequency deviation estimating method, comprising:
The time-domain signal on each diameter that transmitting terminal is sent is received, and according to the time-domain signal acquisition on each diameter
Running time-frequency resource on each diameter；
Channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains the channel estimation in frequency domain on each diameter
Value；
According to the channel estimation in frequency domain value on each diameter, the time domain channel estimated value on each diameter is determined；
According to the time domain channel estimated value on each diameter, the frequency deviation on each diameter is determined.
Wherein, the time-domain signal received on each diameter that transmitting terminal is sent, and according to the time-domain signal on each diameter
Obtain the running time-frequency resource on each diameter, comprising:
Receive the time-domain signal on each diameter that transmitting terminal is sent；
Fast Fourier Transform (FFT) FFT is carried out to the time-domain signal on each diameter respectively, obtains the time-frequency on each diameter
Resource.
Wherein, the frequency domain that channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains on each diameter
Channel estimation value, comprising:
Least square LS channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains the frequency on each diameter
Domain channel estimation value.
Wherein, the channel estimation in frequency domain value according on each diameter determines the time domain channel estimation on each diameter
Value, comprising:
Inverse discrete Fourier transform IDFT is carried out to the sequence being made of the channel estimation in frequency domain value on each diameter, really
Time domain channel estimated value on fixed each diameter.
Wherein, the time domain channel estimated value according on each diameter, determines the frequency deviation on each diameter, comprising:
For in the time domain channel estimated value on each diameter the first time domain channel estimated value and the second time domain channel estimate
Evaluation calculates the conjugation of the first time domain channel estimated value, obtains a numerical value；
The numerical value is multiplied with the second time domain channel estimated value, determines the frequency deviation on the first diameter；
Wherein, the first time domain channel estimated value and the second time domain channel estimated value are that different diameters is corresponding
Time domain channel estimated value.
Wherein, the method also includes:
Automatic frequency tracking is carried out to the frequency deviation.
It is wherein, described that automatic frequency tracking is carried out to the frequency deviation, comprising:
Determine the corresponding weighted average coefficients of each diameter；
According to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter, the frequency on each diameter is calculated
Inclined weighted average；
Automatic frequency tracking is carried out to the frequency deviation weighted average.
Wherein, it according to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter, calculates on each diameter
Frequency deviation weighted average, comprising:
The frequency deviation weighted average on each diameter is calculated using following formula:
Wherein, Δ f indicates frequency deviation weighted average, P (Δ fp) indicate the corresponding weighted average coefficients of each diameter, Δ fpIt indicates
Frequency deviation on each diameter, p=1,2 ... n, Indicate first of symbol, the time domain channel on pth diameter
Estimated value, n indicate the sum of diameter.
It is wherein, described that automatic frequency tracking is carried out to the frequency deviation, comprising:
According to preset rules, target frequency deviation is determined from the frequency deviation on each diameter；
Automatic frequency tracking is carried out to the target frequency deviation.
Second aspect, the embodiment of the present invention provide a kind of frequency deviation estimating method, comprising:
Obtain the running time-frequency resource on each diameter；
Inverse fast Fourier transform IFFT is carried out to the running time-frequency resource on each diameter respectively, obtains the time domain on each diameter
Signal；
The time-domain signal on each diameter is sent to receiving end.
The third aspect, the embodiment of the present invention provide a kind of frequency bias estimation equipment, comprising: transceiver, memory, processor
And it is stored in the computer program that can be run on the memory and on the processor；
The transceiver, the time-domain signal on each diameter for receiving transmitting terminal transmission；
The processor executes following process for reading the program in memory:
The running time-frequency resource on each diameter is obtained according to the time-domain signal on each diameter；Respectively on each diameter
Running time-frequency resource carries out channel estimation, obtains the channel estimation in frequency domain value on each diameter；According to the channel estimation in frequency domain on each diameter
Value, determines the time domain channel estimated value on each diameter；According to the time domain channel estimated value on each diameter, determine described each
Frequency deviation on diameter.
Wherein, the processor is also used to read the program in memory, executes following process: respectively to each diameter
On time-domain signal carry out Fast Fourier Transform (FFT) FFT, obtain the running time-frequency resource on each diameter.
Wherein, the processor is also used to read the program in memory, executes following process: respectively to each diameter
On running time-frequency resource carry out least square LS channel estimation, obtain the channel estimation in frequency domain value on each diameter.
Wherein, the processor is also used to read the program in memory, executes following process: to by each diameter
Channel estimation in frequency domain value composition sequence carry out inverse discrete Fourier transform IDFT, determine the time domain channel on each diameter
Estimated value.
Wherein, the processor is also used to read the program in memory, executes following process:
For in the time domain channel estimated value on each diameter the first time domain channel estimated value and the second time domain channel estimate
Evaluation calculates the conjugation of the first time domain channel estimated value, obtains a numerical value；
The numerical value is multiplied with the second time domain channel estimated value, determines the frequency deviation on the first diameter；
When wherein the first time domain channel estimated value and the second time domain channel estimated value are that different diameters is corresponding
Domain channel estimation value.
Wherein, the processor is also used to read the program in memory, executes following process:
Automatic frequency tracking is carried out to the frequency deviation.
Wherein, the processor is also used to read the program in memory, executes following process:
Determine the corresponding weighted average coefficients of each diameter；
According to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter, the frequency on each diameter is calculated
Inclined weighted average；
Automatic frequency tracking is carried out to the frequency deviation weighted average.
Wherein, the processor is also used to read the program in memory, executes following process:
The frequency deviation weighted average on each diameter is calculated using following formula:
Wherein, Δ f indicates frequency deviation weighted average, P (Δ fp) indicate the corresponding weighted average coefficients of each diameter, Δ fpIt indicates
Frequency deviation on each diameter, p=1,2 ... n, Indicate first of symbol, the time domain channel on pth diameter
Estimated value, n indicate the sum of diameter.
Wherein, the processor is also used to read the program in memory, executes following process:
According to preset rules, target frequency deviation is determined from the frequency deviation on each diameter；
Automatic frequency tracking is carried out to the target frequency deviation.
Fourth aspect, the embodiment of the present invention provide a kind of frequency bias estimation equipment, comprising: transceiver, memory, processor
And it is stored in the computer program that can be run on the memory and on the processor；
The processor executes following process for reading the program in memory:
Obtain the running time-frequency resource on each diameter；Inverse fast Fourier transform is carried out to the running time-frequency resource on each diameter respectively
IFFT obtains the time-domain signal on each diameter；
The transceiver, for sending the time-domain signal on each diameter to receiving end.
5th aspect, the embodiment of the present invention provide a kind of frequency deviation estimation device, comprising:
First obtains module, the time-domain signal on each diameter for receiving transmitting terminal transmission, and according on each diameter
Time-domain signal obtains the running time-frequency resource on each diameter；
Second obtains module, for carrying out channel estimation to the running time-frequency resource on each diameter respectively, obtains on each diameter
Channel estimation in frequency domain value；
First determining module, for determining the time domain on each diameter according to the channel estimation in frequency domain value on each diameter
Channel estimation value；
Second determining module, for determining the frequency on each diameter according to the time domain channel estimated value on each diameter
Partially.
Wherein, second determining module includes:
Computational submodule, for for the first time domain channel estimated value in the time domain channel estimated value on each diameter
With the second time domain channel estimated value, the conjugation of the first time domain channel estimated value is calculated, obtains a numerical value；
It determines submodule, for the numerical value to be multiplied with the second time domain channel estimated value, determines on the first diameter
Frequency deviation；
When wherein the first time domain channel estimated value and the second time domain channel estimated value are that different diameters is corresponding
Domain channel estimation value.
Wherein, described device further include:
Tracking module, for carrying out automatic frequency tracking to the frequency deviation.
Wherein, the tracking module includes:
Submodule is determined, for determining the corresponding weighted average coefficients of each diameter；
Computational submodule, for calculating according to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter
Frequency deviation weighted average on each diameter；
Submodule is tracked, for carrying out automatic frequency tracking to the frequency deviation weighted average.
6th aspect, the embodiment of the present invention provide a kind of frequency deviation estimation device, comprising:
First obtains module, for obtaining the running time-frequency resource on each diameter；
Second obtains module, for carrying out inverse fast Fourier transform IFFT to the running time-frequency resource on each diameter respectively,
Obtain the time-domain signal on each diameter；
Sending module, for sending the time-domain signal on each diameter to receiving end.
7th aspect, the embodiment of the present invention provides a kind of computer readable storage medium, for storing computer program,
The step in method as described in relation to the first aspect is realized when the computer program is executed by processor；Or the computer
The step in the method as described in second aspect is realized when program is executed by processor.
The advantageous effects of the above technical solutions of the present invention are as follows:
In embodiments of the present invention, the running time-frequency resource on each diameter is obtained according to the time-domain signal on multipath, respectively to described
Running time-frequency resource on each diameter carries out channel estimation, obtains the channel estimation in frequency domain value on each diameter.Then, according to described each
Channel estimation in frequency domain value on diameter determines the time domain channel estimated value on each diameter, and then according to the time domain on each diameter
Channel estimation value determines the frequency deviation on each diameter.It can thus be seen that in embodiments of the present invention, in the more RRH rings of high-speed rail
Under border, the frequency deviation on every diameter can be estimated, to improve the standard for carrying out offset estimation under more RRH high-speed rail environment
True property.
Detailed description of the invention
Fig. 1 is the flow chart of the frequency deviation estimating method of the embodiment of the present invention；
Fig. 2 is the flow chart of the frequency deviation estimating method of the embodiment of the present invention；
Fig. 3 is LTE transmitting terminal/receiving end treatment process schematic block diagram in the embodiment of the present invention；
Fig. 4 is CRS time-frequency location schematic diagram；
Fig. 5 is treatment process schematic diagram of the receiving end after obtaining the time-domain resource on each diameter；
Fig. 6 is the schematic diagram of the frequency deviation estimation device of the embodiment of the present invention；
Fig. 7 is the first schematic diagram for obtaining module in the frequency deviation estimation device of the embodiment of the present invention；
Fig. 8 is the schematic diagram of the second determining module in the frequency deviation estimation device of the embodiment of the present invention；
Fig. 9 is the another schematic diagram of the frequency deviation estimation device of the embodiment of the present invention；
Figure 10 is the schematic diagram of tracking module in the frequency deviation estimation device of the embodiment of the present invention；
Figure 11 is the schematic diagram of the frequency deviation estimation device of the embodiment of the present invention；
Figure 12 is the schematic diagram of the frequency bias estimation equipment of the embodiment of the present invention；
Figure 13 is the schematic diagram of the frequency bias estimation equipment of the embodiment of the present invention.
Specific embodiment
Below in conjunction with drawings and examples, specific embodiments of the present invention will be described in further detail.Following reality
Example is applied for illustrating the present invention, but is not intended to limit the scope of the invention.
As shown in Figure 1, the frequency deviation estimating method of the embodiment of the present invention, is applied to receiving end, comprising:
The time-domain signal on each diameter that step 101, reception transmitting terminal are sent, and according to the time-domain signal on each diameter
Obtain the running time-frequency resource on each diameter.
In embodiments of the present invention, the transmission path of each RRH can be described as a path or a diameter.In more RRH high
Under iron hoop border, there are multiple diameters.Here, can receive the time-domain signal on each diameter that transmitting terminal is sent, and root for each diameter
The running time-frequency resource on each diameter is obtained according to the time-domain signal on each diameter.
Specifically, receiving the time-domain signal on each diameter that transmitting terminal is sent, and respectively to the time-domain signal on each diameter
It carries out Fast Fourier Transform (FFT) (Fast Fourier Transformation, FFT), obtains the time-frequency money on each diameter
Source.
Step 102 carries out channel estimation to the running time-frequency resource on each diameter respectively, obtains the frequency domain on each diameter
Channel estimation value.
In this step, least square (least-square is carried out to the running time-frequency resource on each diameter respectively
Estimation, LS) channel estimation, obtain the channel estimation in frequency domain value on each diameter.
Step 103, according to the channel estimation in frequency domain value on each diameter, determine on each diameter time domain channel estimation
Value.
Here, carrying out inverse discrete Fourier transform to the sequence being made of the channel estimation in frequency domain value on each diameter
(Inverse Discrete Fourier Transform, IDFT), determines the time domain channel estimated value on each diameter.
Step 104, according to the time domain channel estimated value on each diameter, determine the frequency deviation on each diameter.
In this step, for the first time domain channel estimated value and in the time domain channel estimated value on each diameter
Two time domain channel estimated values calculate the conjugation of the first time domain channel estimated value, a numerical value are obtained, by the numerical value and institute
The multiplication of the second time domain channel estimated value is stated, determines the frequency deviation on the first diameter.
Wherein, the first time domain channel estimated value and the second time domain channel estimated value are that different diameters is corresponding
Time domain channel estimated value.
In embodiments of the present invention, the running time-frequency resource on each diameter is obtained according to the time-domain signal on multipath, respectively to described
Running time-frequency resource on each diameter carries out channel estimation, obtains the channel estimation in frequency domain value on each diameter.Then, according to described each
Channel estimation in frequency domain value on diameter determines the time domain channel estimated value on each diameter, and then according to the time domain on each diameter
Channel estimation value determines the frequency deviation on each diameter.It can thus be seen that in embodiments of the present invention, in the more RRH rings of high-speed rail
Under border, the frequency deviation on every diameter can be estimated, to improve the standard for carrying out offset estimation under more RRH high-speed rail environment
True property.
As shown in Fig. 2, the frequency deviation estimating method of the embodiment of the present invention, comprising:
Running time-frequency resource in step 201, each diameter of acquisition.
Step 202 carries out inverse fast Fourier transform (inverse Fast to the running time-frequency resource on each diameter respectively
Fourier Transform, IFFT), obtain the time-domain signal on each diameter.
Step 203 sends the time-domain signal on each diameter to receiving end.
In embodiments of the present invention, the running time-frequency resource on each diameter is obtained according to the time-domain signal on multipath, respectively to described
Running time-frequency resource on each diameter carries out channel estimation, obtains the channel estimation in frequency domain value on each diameter.Then, according to described each
Channel estimation in frequency domain value on diameter determines the time domain channel estimated value on each diameter, and then according to the time domain on each diameter
Channel estimation value determines the frequency deviation on each diameter.It can thus be seen that in embodiments of the present invention, in the more RRH rings of high-speed rail
Under border, the frequency deviation on every diameter can be estimated, to improve the standard for carrying out offset estimation under more RRH high-speed rail environment
True property.
In conjunction with embodiment below, the specific implementation process of frequency deviation estimating method of the present invention is described in detail.
By taking LTE (long term evolution, long term evolution) as an example, as shown in figure 3, being LTE transmitting terminal/receiving end
Treatment process schematic block diagram.
Assuming that ak,lRunning time-frequency resource on expression k-th of subcarrier of transmitting terminal, first of symbol, sl(t) transmitting terminal is indicated
After IFFT variation, the time-domain signal on t-th of sampling point of first of symbol.
In transmitting terminal, the running time-frequency resource on each diameter is obtained, the running time-frequency resource on each diameter is carried out in quick Fu respectively
Leaf inverse transformation obtains the time-domain signal on each diameter, sends the time-domain signal on each diameter to receiving end.
Assuming that there are n RRH, Doppler frequency shift is respectively Δ f under " more RRH high-speed rail environment "1, Δ f2..., Δ fn；
Multidiameter delay is respectively Δ t1, Δ t2..., Δ tn；Relative power is respectively p1, p2..., pn。
For receiving end, the time-domain signal on each diameter that transmitting terminal is sent is received, and is believed according to the time domain on each diameter
Number obtain the running time-frequency resource on each diameter.
yl(t) time-domain signal on t-th of sampling point of first of receiving end symbol is indicated,P=1,2 ..., n, wherein n (t) indicates making an uproar for t moment
Sound.
rk,l=FFT [yl(t)], indicate in receiving end after FFT changes, on k-th of subcarrier, the l symbol when
Frequency resource.
In LTE, all it is on the proprietary pilot tone of cell (or public guide frequency) (Cell-specific RS, CRS) time domain/frequency domain
Discrete distribution, R0Indicate CRS time-frequency location.
Fig. 5 is treatment process schematic diagram of the receiving end after obtaining the time-domain resource on each diameter.In conjunction with Fig. 5, receiving
End carries out LS channel estimation to the running time-frequency resource on each diameter respectively, obtains the channel estimation in frequency domain value on each diameter.
According to rk,lWith known pilot symbols ak,l, it is assumed that ignore influence of noise, then can estimate to obtain CRS by LS
The channel estimation in frequency domain value set:
It,, just can be by frequency only as frequency domain sample points N >=M if sequence length is M according to sample theorem in frequency domain
Domain samples X (k) and restores original time-domain signal x (n) without distortion；Otherwise, Time-domain aliasing phenomenon is generated.Under normal circumstances, distinguishable
Multipath number it is limited, CRS number of samples on maximum multipath delay < frequency domain, so meeting sample theorem in frequency domain.
To on each symbol, the channel estimation in frequency domain value of each subcarrierThe sequence H of compositionlIDFT variation is carried out, then
The time domain channel estimated value of each subcarrier can be recovered, the time domain channel estimated value table on first of symbol, pth diameter is shown as
By taking LTE system 20M bandwidth as an example, FFT length is 2048, i.e., 2048 subcarriers (wherein 1200 are shared on frequency domain
A effective subcarrier, remaining is empty subcarrier).CRS 6 subcarriers at equal intervals on frequency domain, totally 200 CRS subcarriers.By
It is not integer in 2048/6, so, can not 2048 subcarriers be done at equal intervals 6 frequency domain sample, i.e. 6 sampling at equal intervals
Practical is nonuniform sampling.
Assuming that rectangular window is added to 2048 subcarriers of frequency domain, and such as: 2048- > 1944, then 1944/6=324 is integer,
I.e. IDFT length is 324；Or 2048- > 1536, then 1536/6=256, i.e. IDFT length are 256.But frequency domain adds rectangle
Window is equivalent to convolution s inc function, can make time domain channel estimation there is aliasing, compare " 2048- > 1944 " and
The s inc function secondary lobe of two kinds of " 2048- > 1536 ", " 2048- > 1944 " is smaller.Assuming that IDFT length is selected from 324 or 256
When, it is proposed that selection IDFT length takes 324.
And there are following relationships for the time domain channel estimation of each symbol:
Indicate t symbol of l+ Δ, the time domain channel estimation on pth article diameter
Value.
So similarly, it can be by distinct symbols positionConjugate multiplication is done, is obtained
And due to Δ t it is known that so, can be according to conjugate multiplication result CpPhase find out the frequency deviation Δ f of pth diameterp,
To achieve the purpose that the estimation frequency deviation value different from multiple RRH (or a plurality of diameter).
On the basis of the above-mentioned frequency deviation calculated on each diameter, the embodiment of the present invention also carries out using the frequency deviation automatic
Frequency-tracking (also known as automatic frequency controls, (Automatic Frequency Control, AFC)).
For automatic frequency tracking, a single frequency deviation can only be tracked/corrected.So when under " more RRH high-speed rail environment "
There are when multiple frequency deviations, require consideration for how to carry out automatic frequency tracking.Frequency deviation will lead to ofdm system and inter-carrier interference occurs
(Inter Carrier Interference, ICI), and under " more RRH high-speed rail environment ", since the frequency of all diameters cannot be corrected
Partially, so, inevitably there is ICI.
However, it is possible to the influence of ICI is minimized by doing weighted average to each diameter frequency deviation, meanwhile, processing can also in this way
To prevent the rapid jumping of AFC tracking frequency offset Δ f.
That is, determine the corresponding weighted average coefficients of each diameter, according to corresponding weighted average coefficients of each diameter and described each
Frequency deviation on diameter calculates the frequency deviation weighted average on each diameter, to the frequency deviation weighted average carry out automatic frequency with
Track.
The frequency deviation weighted average on each diameter is calculated using following formula:
Wherein,
Wherein, Δ f indicates frequency deviation weighted average, P (Δ fp) indicate the corresponding weighted average coefficients of each diameter, Δ fpIt indicates
Frequency deviation on each diameter, p=1,2 ... n, Indicate first of symbol, the time domain channel on pth diameter
Estimated value, n indicate the sum of diameter.
Alternatively, in a particular application, also target frequency deviation can be determined from the frequency deviation on each diameter according to preset rules,
Automatic frequency tracking is carried out to the target frequency deviation.
Wherein, the preset rules can be any selection, or the fixed frequency deviation etc. selected on some diameter.
It should be noted that the method for above-described embodiment can be applied not only to LTE system, all OFDM are applied also for
System.
From the above, it can be seen that the embodiment of the present invention can accurately estimate each diameter frequency deviation under " more RRH high-speed rail environment ",
And automatic frequency tracking performance can be optimized using the result of weighted average of each diameter frequency deviation.
As shown in fig. 6, the frequency deviation estimation device of the embodiment of the present invention, comprising:
First obtains module 601, the time-domain signal on each diameter for receiving transmitting terminal transmission, and according to each diameter
On time-domain signal obtain the running time-frequency resource on each diameter；Second obtains module 602, for respectively on each diameter
Running time-frequency resource carries out channel estimation, obtains the channel estimation in frequency domain value on each diameter；First determining module 603, for according to
Channel estimation in frequency domain value on each diameter determines the time domain channel estimated value on each diameter；Second determining module 604 is used for root
According to the time domain channel estimated value on each diameter, the frequency deviation on each diameter is determined.
Wherein, as shown in fig. 7, the first acquisition module 601 includes:
Receiving submodule 6011, the time-domain signal on each diameter for receiving transmitting terminal transmission；
Transformation submodule 6012 is obtained for carrying out Fast Fourier Transform (FFT) to the time-domain signal on each diameter respectively
Running time-frequency resource on each diameter.
Wherein, the second acquisition module 602 is specifically used for, and carries out LS letter to the running time-frequency resource on each diameter respectively
Road estimation, obtains the channel estimation in frequency domain value on each diameter.
Wherein, first determining module 603 is specifically used for, and forms to by the channel estimation in frequency domain value on each diameter
Sequence carry out inverse discrete Fourier transform, determine the time domain channel estimated value on each diameter.
Wherein, as shown in figure 8, second determining module 604 includes: computational submodule 6041, for for described each
The first time domain channel estimated value and the second time domain channel estimated value in time domain channel estimated value on diameter calculate described first
The conjugation of time domain channel estimated value obtains a numerical value；It determines submodule 6042, is used for the numerical value and second time domain
Channel estimation value is multiplied, and determines the frequency deviation on the first diameter；Wherein the first time domain channel estimated value and second time domain letter
Road estimated value is the different corresponding time domain channel estimated value of diameter.
As shown in figure 9, described device further include: tracking module 605, for carrying out automatic frequency tracking to the frequency deviation.
As shown in Figure 10, the tracking module 605 includes:
Submodule 6051 is determined, for determining the corresponding weighted average coefficients of each diameter；Computational submodule 6052 is used for root
According to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter, the frequency deviation weighted average on each diameter is calculated
Value；Submodule 6053 is tracked, for carrying out automatic frequency tracking to the frequency deviation weighted average.
Specifically, calculating the frequency deviation weighted average on each diameter using following formula:
Wherein, Δ f indicates frequency deviation weighted average, P (Δ fp) indicate the corresponding weighted average coefficients of each diameter, Δ fpIt indicates
Frequency deviation on each diameter, p=1,2 ... n, Indicate first of symbol, the time domain channel on pth diameter
Estimated value, n indicate the sum of diameter.
Alternatively, the tracking module 605 is specifically used for, according to preset rules, mesh is determined from the frequency deviation on each diameter
Frequency deviation is marked, automatic frequency tracking is carried out to the target frequency deviation.
The working principle of device of the present invention can refer to the description of preceding method embodiment.
In embodiments of the present invention, the running time-frequency resource on each diameter is obtained according to the time-domain signal on multipath, respectively to described
Running time-frequency resource on each diameter carries out channel estimation, obtains the channel estimation in frequency domain value on each diameter.Then, according to described each
Channel estimation in frequency domain value on diameter determines the time domain channel estimated value on each diameter, and then according to the time domain on each diameter
Channel estimation value determines the frequency deviation on each diameter.It can thus be seen that in embodiments of the present invention, in the more RRH rings of high-speed rail
Under border, the frequency deviation on every diameter can be estimated, to improve the standard for carrying out offset estimation under more RRH high-speed rail environment
True property.
As shown in figure 11, the frequency deviation estimation device of the embodiment of the present invention, comprising:
First obtains module 1101, for obtaining the running time-frequency resource on each diameter；Second obtains module 1102, for distinguishing
Inverse fast Fourier transform IFFT is carried out to the running time-frequency resource on each diameter, obtains the time-domain signal on each diameter；Sending module
1103, for sending the time-domain signal on each diameter to receiving end.
The working principle of device of the present invention can refer to the description of preceding method embodiment.
In embodiments of the present invention, the running time-frequency resource on each diameter is obtained according to the time-domain signal on multipath, respectively to described
Running time-frequency resource on each diameter carries out channel estimation, obtains the channel estimation in frequency domain value on each diameter.Then, according to described each
Channel estimation in frequency domain value on diameter determines the time domain channel estimated value on each diameter, and then according to the time domain on each diameter
Channel estimation value determines the frequency deviation on each diameter.It can thus be seen that in embodiments of the present invention, in the more RRH rings of high-speed rail
Under border, the frequency deviation on every diameter can be estimated, to improve the standard for carrying out offset estimation under more RRH high-speed rail environment
True property.
As shown in figure 12, the frequency bias estimation equipment of the embodiment of the present invention, comprising:
Processor 1200 executes following process: being connect by transceiver 1210 for reading the program in memory 1220
Receive transmitting terminal send each diameter on time-domain signal, and according to the time-domain signal on each diameter obtain on each diameter when
Frequency resource；Channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains the channel estimation in frequency domain on each diameter
Value；According to the channel estimation in frequency domain value on each diameter, the time domain channel estimated value on each diameter is determined；According to described each
Time domain channel estimated value on diameter determines the frequency deviation on each diameter；
Transceiver 1210, for sending and receiving data under the control of processor 1200.
Wherein, in Figure 12, bus architecture may include the bus and bridge of any number of interconnection, specifically by processor
The various circuits for the memory that 1200 one or more processors represented and memory 1220 represent link together.Bus
Framework can also link together various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like,
These are all it is known in the art, and therefore, it will not be further described herein.Bus interface provides interface.Transmitting-receiving
Machine 1210 can be multiple element, that is, include transmitter and transceiver, provide for over a transmission medium with various other devices
The unit of communication.Processor 1200 is responsible for management bus architecture and common processing, memory 1220 can store processor
1200 when executing operation used data.
Processor 1200 is responsible for management bus architecture and common processing, memory 1220 can store processor 1200
The used data when executing operation.
Processor 1200 is also used to read the computer program, executes following steps:
Fast Fourier Transform (FFT) FFT is carried out to the time-domain signal on each diameter respectively, obtains the time-frequency on each diameter
Resource.
Processor 1200 is also used to read the computer program, executes following steps:
Least square LS channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains the frequency domain letter on each diameter
Road estimated value.
Processor 1200 is also used to read the computer program, executes following steps:
Inverse discrete Fourier transform IDFT is carried out to the sequence being made of the channel estimation in frequency domain value on each diameter, really
Time domain channel estimated value on fixed each diameter.
Processor 1200 is also used to read the computer program, executes following steps:
For in the time domain channel estimated value on each diameter the first time domain channel estimated value and the second time domain channel estimate
Evaluation calculates the conjugation of the first time domain channel estimated value, obtains a numerical value；
The numerical value is multiplied with the second time domain channel estimated value, determines the frequency deviation on the first diameter；
When wherein the first time domain channel estimated value and the second time domain channel estimated value are that different diameters is corresponding
Domain channel estimation value.
Processor 1200 is also used to read the computer program, executes following steps: carrying out automatic frequency to the frequency deviation
Rate tracking.
Processor 1200 is also used to read the computer program, executes following steps:
Determine the corresponding weighted average coefficients of each diameter；
According to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter, the frequency on each diameter is calculated
Inclined weighted average；
Automatic frequency tracking is carried out to the frequency deviation weighted average.
Processor 1200 is also used to read the computer program, executes following steps:
The frequency deviation weighted average on each diameter is calculated using following formula:
On time domain channel estimated value, n indicate diameter sum.
Processor 1200 is also used to read the computer program, executes following steps:
According to preset rules, target frequency deviation is determined from the frequency deviation on each diameter；
Automatic frequency tracking is carried out to the target frequency deviation.
As shown in figure 13, the frequency bias estimation equipment of the embodiment of the present invention, comprising:
Processor 1300 executes following process: obtaining the time-frequency on each diameter for reading the program in memory 1320
Resource carries out inverse fast Fourier transform IFFT to the running time-frequency resource on each diameter respectively, obtains the time domain letter on each diameter
Number, the time-domain signal on each diameter is sent to receiving end by transceiver 1310；
Transceiver 1310, for sending and receiving data under the control of processor 1300.
Wherein, in Figure 13, bus architecture may include the bus and bridge of any number of interconnection, specifically by processor
The various circuits for the memory that 1300 one or more processors represented and memory 1320 represent link together.Bus
Framework can also link together various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like,
These are all it is known in the art, and therefore, it will not be further described herein.Bus interface provides interface.Transmitting-receiving
Machine 1310 can be multiple element, that is, include transmitter and transceiver, provide for over a transmission medium with various other devices
The unit of communication.Processor 1300 is responsible for management bus architecture and common processing, memory 1320 can store processor
1300 when executing operation used data.
Processor 1300 is responsible for management bus architecture and common processing, memory 1320 can store processor 1300
The used data when executing operation.
In addition, the computer readable storage medium of the embodiment of the present invention, for storing computer program, the computer
Program can be executed by processor and perform the steps of
Obtain the running time-frequency resource on each diameter；
Inverse fast Fourier transform IFFT is carried out to the running time-frequency resource on each diameter respectively, obtains the time domain on each diameter
Signal；
The time-domain signal on each diameter is sent to receiving end.
In addition, the computer readable storage medium of the embodiment of the present invention, for storing computer program, the computer
Program can be executed by processor and perform the steps of
The time-domain signal on each diameter that transmitting terminal is sent is received, and according to the time-domain signal acquisition on each diameter
Running time-frequency resource on each diameter；
Channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains the channel estimation in frequency domain on each diameter
Value；
According to the channel estimation in frequency domain value on each diameter, the time domain channel estimated value on each diameter is determined；
According to the time domain channel estimated value on each diameter, the frequency deviation on each diameter is determined.
Wherein, the time-domain signal received on each diameter that transmitting terminal is sent, and according to the time-domain signal on each diameter
Obtain the running time-frequency resource on each diameter, comprising:
Receive the time-domain signal on each diameter that transmitting terminal is sent；
Fast Fourier Transform (FFT) FFT is carried out to the time-domain signal on each diameter respectively, obtains the time-frequency on each diameter
Resource.
Wherein, the frequency domain that channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains on each diameter
Channel estimation value, comprising:
Least square LS channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains the frequency on each diameter
Domain channel estimation value.
Wherein, the channel estimation in frequency domain value according on each diameter determines the time domain channel estimation on each diameter
Value, comprising:
Inverse discrete Fourier transform IDFT is carried out to the sequence being made of the channel estimation in frequency domain value on each diameter, really
Time domain channel estimated value on fixed each diameter.
Wherein, the time domain channel estimated value according on each diameter, determines the frequency deviation on each diameter, comprising:
For in the time domain channel estimated value on each diameter the first time domain channel estimated value and the second time domain channel estimate
Evaluation calculates the conjugation of the first time domain channel estimated value, obtains a numerical value；
The numerical value is multiplied with the second time domain channel estimated value, determines the frequency deviation on the first diameter；
Wherein, the first time domain channel estimated value and the second time domain channel estimated value are that different diameters is corresponding
Time domain channel estimated value.
Wherein, the method also includes:
Automatic frequency tracking is carried out to the frequency deviation.
It is wherein, described that automatic frequency tracking is carried out to the frequency deviation, comprising:
Determine the corresponding weighted average coefficients of each diameter；
According to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter, the frequency on each diameter is calculated
Inclined weighted average；
Automatic frequency tracking is carried out to the frequency deviation weighted average.
Wherein, it according to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter, calculates on each diameter
Frequency deviation weighted average, comprising:
The frequency deviation weighted average on each diameter is calculated using following formula:
Wherein, Δ f indicates frequency deviation weighted average, P (Δ fp) indicate the corresponding weighted average coefficients of each diameter, Δ fpIt indicates
Frequency deviation on each diameter, p=1,2 ... n, Indicate first of symbol, the time domain channel on pth diameter
Estimated value, n indicate the sum of diameter.
It is wherein, described that automatic frequency tracking is carried out to the frequency deviation, comprising:
According to preset rules, target frequency deviation is determined from the frequency deviation on each diameter；
Automatic frequency tracking is carried out to the target frequency deviation.
In several embodiments provided herein, it should be understood that disclosed method and apparatus can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit,
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be with
In conjunction with or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING of device or unit
Or communication connection, it can be electrical property, mechanical or other forms.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that the independent physics of each unit includes, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit being realized in the form of SFU software functional unit, can store computer-readable at one
In storage medium.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a calculating
Machine equipment (can be personal computer, server or the network equipment etc.) executes transmitting-receiving side described in each embodiment of the present invention
The part steps of method.And storage medium above-mentioned include: USB flash disk, mobile hard disk, read-only memory (Read-Only Memory,
Abbreviation ROM), random access memory (Random Access Memory, abbreviation RAM), magnetic or disk etc. are various can be with
Store the medium of program code.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (26)
1. a kind of frequency deviation estimating method characterized by comprising
The time-domain signal on each diameter that transmitting terminal is sent is received, and is obtained on each diameter according to the time-domain signal on each diameter
Running time-frequency resource；
Channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains the channel estimation in frequency domain value on each diameter；
According to the channel estimation in frequency domain value on each diameter, the time domain channel estimated value on each diameter is determined；
According to the time domain channel estimated value on each diameter, the frequency deviation on each diameter is determined.
2. the method according to claim 1, wherein the time domain letter received on each diameter that transmitting terminal is sent
Number, and the running time-frequency resource on each diameter is obtained according to the time-domain signal on each diameter, comprising:
Receive the time-domain signal on each diameter that transmitting terminal is sent；
Fast Fourier Transform (FFT) FFT is carried out to the time-domain signal on each diameter respectively, obtains the running time-frequency resource on each diameter.
3. the method according to claim 1, wherein described carry out letter to the running time-frequency resource on each diameter respectively
Road estimation, obtains the channel estimation in frequency domain value on each diameter, comprising:
Least square LS channel estimation is carried out to the running time-frequency resource on each diameter respectively, obtains the frequency domain channel on each diameter
Estimated value.
4. the method according to claim 1, wherein the channel estimation in frequency domain value according on each diameter,
Determine the time domain channel estimated value on each diameter, comprising:
Inverse discrete Fourier transform IDFT is carried out to the sequence that is made of the channel estimation in frequency domain value on each diameter, determine described in
Time domain channel estimated value on each diameter.
5. the method according to claim 1, wherein the time domain channel estimated value according on each diameter,
Determine the frequency deviation on each diameter, comprising:
For the first time domain channel estimated value and the second time domain channel estimated value in the time domain channel estimated value on each diameter,
The conjugation of the first time domain channel estimated value is calculated, a numerical value is obtained；
The numerical value is multiplied with the second time domain channel estimated value, determines the frequency deviation on the first diameter；
Wherein, the first time domain channel estimated value and the second time domain channel estimated value are the corresponding time domain letter of different diameters
Road estimated value.
6. the method according to claim 1, wherein the method also includes:
Automatic frequency tracking is carried out to the frequency deviation.
7. according to the method described in claim 6, it is characterized in that, described carry out automatic frequency tracking to the frequency deviation, comprising:
Determine the corresponding weighted average coefficients of each diameter；
According to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter, the frequency deviation weighting on each diameter is calculated
Average value；
Automatic frequency tracking is carried out to the frequency deviation weighted average.
8. the method according to the description of claim 7 is characterized in that according to corresponding weighted average coefficients of each diameter and described
Frequency deviation on each diameter calculates the frequency deviation weighted average on each diameter, comprising:
The frequency deviation weighted average on each diameter is calculated using following formula:
Δ f=∑ P (Δ fp)·Δfp；
Wherein, Δ f indicates frequency deviation weighted average,pP(Δfp) indicate the corresponding weighted average coefficients of each diameter, Δ fpIndicate each diameter
On frequency deviation, p=1,2 ... n, Indicate first of symbol, the time domain channel estimation on pth diameter
Value, n indicate the sum of diameter.
9. according to the method described in claim 6, it is characterized in that, described carry out automatic frequency tracking to the frequency deviation, comprising:
According to preset rules, target frequency deviation is determined from the frequency deviation on each diameter；
Automatic frequency tracking is carried out to the target frequency deviation.
10. a kind of frequency deviation estimating method characterized by comprising
Obtain the running time-frequency resource on each diameter；
Inverse fast Fourier transform IFFT is carried out to the running time-frequency resource on each diameter respectively, obtains the time-domain signal on each diameter；
The time-domain signal on each diameter is sent to receiving end.
11. a kind of frequency bias estimation equipment, comprising: transceiver, memory, processor and be stored on the memory and can be in institute
State the computer program run on processor；It is characterized in that,
The transceiver, the time-domain signal on each diameter for receiving transmitting terminal transmission；
The processor executes following process for reading the program in memory:
The running time-frequency resource on each diameter is obtained according to the time-domain signal on each diameter；The time-frequency on each diameter is provided respectively
Source carries out channel estimation, obtains the channel estimation in frequency domain value on each diameter；According to the channel estimation in frequency domain value on each diameter, determine
Time domain channel estimated value on each diameter；According to the time domain channel estimated value on each diameter, the frequency on each diameter is determined
Partially.
12. equipment according to claim 11, which is characterized in that the processor is also used to read the journey in memory
Sequence executes following process: carrying out Fast Fourier Transform (FFT) FFT to the time-domain signal on each diameter respectively, obtains each diameter
On running time-frequency resource.
13. equipment according to claim 11, which is characterized in that the processor is also used to read the journey in memory
Sequence executes following process: carrying out least square LS channel estimation to the running time-frequency resource on each diameter respectively, obtains on each diameter
Channel estimation in frequency domain value.
14. equipment according to claim 11, which is characterized in that the processor is also used to read the journey in memory
Sequence executes following process: carrying out inverse discrete Fourier transform to the sequence being made of the channel estimation in frequency domain value on each diameter
IDFT determines the time domain channel estimated value on each diameter.
15. equipment according to claim 11, which is characterized in that the processor is also used to read the journey in memory
Sequence executes following process:
For the first time domain channel estimated value and the second time domain channel estimated value in the time domain channel estimated value on each diameter,
The conjugation of the first time domain channel estimated value is calculated, a numerical value is obtained；
The numerical value is multiplied with the second time domain channel estimated value, determines the frequency deviation on the first diameter；
Wherein the first time domain channel estimated value and the second time domain channel estimated value are the corresponding time domain letter of different diameters
Road estimated value.
16. equipment according to claim 11, which is characterized in that the processor is also used to read the journey in memory
Sequence executes following process:
Automatic frequency tracking is carried out to the frequency deviation.
17. equipment according to claim 16, which is characterized in that the processor is also used to read the journey in memory
Sequence executes following process:
Determine the corresponding weighted average coefficients of each diameter；
According to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter, the frequency deviation weighting on each diameter is calculated
Average value；
Automatic frequency tracking is carried out to the frequency deviation weighted average.
18. equipment according to claim 17, which is characterized in that the processor is also used to read the journey in memory
Sequence executes following process:
The frequency deviation weighted average on each diameter is calculated using following formula:
Δ f=∑ P (Δ fp)·Δfp；
Wherein, Δ f indicates frequency deviation weighted average,pP(Δfp) indicate the corresponding weighted average coefficients of each diameter, Δ fpIndicate each diameter
On frequency deviation, p=1,2 ... n, Indicate first of symbol, the time domain channel estimation on pth diameter
Value, n indicate the sum of diameter.
19. equipment according to claim 11, which is characterized in that the processor is also used to read the journey in memory
Sequence executes following process:
According to preset rules, target frequency deviation is determined from the frequency deviation on each diameter；
Automatic frequency tracking is carried out to the target frequency deviation.
20. a kind of frequency bias estimation equipment, comprising: transceiver, memory, processor and be stored on the memory and can be in institute
State the computer program run on processor；It is characterized in that,
The processor executes following process for reading the program in memory:
Obtain the running time-frequency resource on each diameter；Inverse fast Fourier transform IFFT is carried out to the running time-frequency resource on each diameter respectively,
Obtain the time-domain signal on each diameter；
The transceiver, for sending the time-domain signal on each diameter to receiving end.
21. a kind of frequency deviation estimation device characterized by comprising
First obtains module, the time-domain signal on each diameter for receiving transmitting terminal transmission, and according to the time domain on each diameter
Signal obtains the running time-frequency resource on each diameter；
Second obtains module, for carrying out channel estimation to the running time-frequency resource on each diameter respectively, obtains the frequency domain on each diameter
Channel estimation value；
First determining module, for determining the time domain channel on each diameter according to the channel estimation in frequency domain value on each diameter
Estimated value；
Second determining module, for determining the frequency deviation on each diameter according to the time domain channel estimated value on each diameter.
22. device according to claim 21, which is characterized in that second determining module includes:
Computational submodule, for for the first time domain channel estimated value and second in the time domain channel estimated value on each diameter
Time domain channel estimated value calculates the conjugation of the first time domain channel estimated value, obtains a numerical value；
It determines submodule, for the numerical value to be multiplied with the second time domain channel estimated value, determines the frequency deviation on the first diameter；
Wherein the first time domain channel estimated value and the second time domain channel estimated value are the corresponding time domain letter of different diameters
Road estimated value.
23. device according to claim 21, which is characterized in that described device further include:
Tracking module, for carrying out automatic frequency tracking to the frequency deviation.
24. device according to claim 23, which is characterized in that the tracking module includes:
Submodule is determined, for determining the corresponding weighted average coefficients of each diameter；
Computational submodule, for according to the frequency deviation on each corresponding weighted average coefficients of diameter and each diameter, described in calculating
Frequency deviation weighted average on each diameter；
Submodule is tracked, for carrying out automatic frequency tracking to the frequency deviation weighted average.
25. a kind of frequency deviation estimation device characterized by comprising
First obtains module, for obtaining the running time-frequency resource on each diameter；
Second obtains module, for carrying out inverse fast Fourier transform IFFT to the running time-frequency resource on each diameter respectively, obtains
Time-domain signal on each diameter；
Sending module, for sending the time-domain signal on each diameter to receiving end.
26. a kind of computer readable storage medium, for storing computer program, which is characterized in that the computer program quilt
Processor realizes the step in method as claimed in any one of claims 1-9 wherein when executing；Or
The computer program realizes the step in method as claimed in claim 10 when being executed by processor.
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| PCT/CN2018/100394 WO2019052297A1 (en) | 2017-09-12 | 2018-08-14 | Frequency offset estimation method, apparatus and device, and computer-readable storage medium |
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| CN114726696A (en) * | 2022-03-09 | 2022-07-08 | 芯翼信息科技(上海)有限公司 | Frequency offset estimation method based on narrow band system, terminal and storage medium |
| CN114726696B (en) * | 2022-03-09 | 2024-04-12 | 芯翼信息科技(上海)有限公司 | Frequency offset estimation method, terminal and storage medium based on narrowband system |
| CN115987740A (en) * | 2023-03-17 | 2023-04-18 | 南京创芯慧联技术有限公司 | Frequency offset estimation method, device, computer equipment and storage medium |
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| WO2019052297A1 (en) | 2019-03-21 |
| CN109495414B (en) | 2020-07-03 |
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