CN106878205B - A kind of timing offset estimation method and device - Google Patents

A kind of timing offset estimation method and device Download PDF

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CN106878205B
CN106878205B CN201510918097.9A CN201510918097A CN106878205B CN 106878205 B CN106878205 B CN 106878205B CN 201510918097 A CN201510918097 A CN 201510918097A CN 106878205 B CN106878205 B CN 106878205B
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time domain
timing offset
domain channel
indicate
estimated result
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CN106878205A (en
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熊芳
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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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
    • H04L25/024—Channel estimation channel estimation algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • 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
    • H04L27/2614—Peak power aspects
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of estimation method of timing offset, device and terminals, to solve the problem of adjacent area timing and local area there are it is larger in advance or lag may cause effective diameter exit window in the case that influences calculating and the adjacent area Timing measurement of effective diameter thresholding.Method are as follows: time domain channel estimated result is determined according to the CRS of adjacent cell, the first effective diameter thresholding is determined according to time domain channel estimated result the first noise window power and peak power, and the first timing offset value of current area and adjacent cell is determined according to the first effective diameter thresholding；The timing offset of time domain channel estimation results is adjusted according to the first timing offset value, the second effective diameter thresholding is determined according to the second noise window power and peak power of time domain channel estimated result adjusted；The second timing offset value that current area and adjacent cell are determined according to the second effective diameter thresholding determines the timing offset between current area and adjacent cell according to the first timing offset value and the second timing offset value.

Description

A kind of timing offset estimation method and device
Technical field
The present invention relates to field of communication technology more particularly to a kind of timing offset estimation methods, device and terminal.
Background technique
Inter-Cell Interference Coordination (Further Enhanced ICIC, the FeICIC) technology further enhanced needs to cope with Occur under isomery scene adjacent area public reference signal (Cell-specific reference signals, CRS, also referred to as The specific reference signal of cell) and/or Physical Broadcast Channel (Physical Broadcast Channel, PBCH) to this cell Strong jamming, (also referred to as such as macro base station-femto base station (also referred to as macro-pico) deployment scenario or macro base station-home base station Macro-femto) deployment scenario, therefore, terminal (UE) need to carry out interference elimination to CRS and/or PBCH.
Under normal circumstances, the time that interfered cell reaches the time of UE and this cell reaches UE exist it is certain relatively partially Difference, there is also certain relative deviations for frequency deviation, and relative time delay deviation possible range is in [- 3,3] microsecond (us), relative frequency deviation Deviation possible range is within [- 300,300] hertz (Hz).A fast Fourier is used only in time-frequency convert and becomes by general UE (Fast Fourier Transformation, FFT) arithmetic element is changed, therefore in order to ensure the demodulation performance of local area, UE can only Timing windowing position is arranged in reception signal based on this cell in the time domain, i.e., the timing that can not track adjacent area carries out adjacent area reality When it is synchronous, carry out needing to estimate the delay spread of adjacent area after channel estimation according to local area timing receipt signal and to adjacent area to carry out Frequency domain filtering.
By taking long term evolution (Long Term Evolution, LTE) downlink as an example, as shown in Figure 1, expanding existing time delay Exhibition algorithm for estimating is described as follows: it is S that known descending pilot frequency, which sends sequence, and the signal received is Y, and spatial frequency domain channel is H+n, wherein H indicates that the impulse response of wireless fading channel, n indicate white Gaussian noise, then meet Y=(H+n) S, thus It can estimate channel estimation in frequency domain are as follows:Channel estimation in frequency domain is transformed to time domain progress delay spread to estimate Meter, it is specific as follows: frequency domain channel to be transformed into time domain, according to cyclic prefix (Cyclic Prefix, CP) length or prior information It determines the position of useful signal time delay maximum diameter, takes out the noise in time domain diameter and maximum diameter for being free of available signal power, calculate Noise power PnoiseAnd peak power Pmax, effective diameter threshold value is determined by setting peak factor and noise factor, thus Effective diameter search space is obtained, determines delay spread value.
Wherein, noise factor and peak factor can be configured based on experience value, and effective diameter threshold value indicates are as follows: and Γ= (Pnoise·βnoise,Pmax·βmax), wherein βnoiseIt indicates noise gate, is the product of noise power and noise factor, βmaxTable Show peak value threshold, is the product of peak power and peak factor.The method of noise window is set according to CP length are as follows: makees CP length For the when elongatedness of time delay maximum diameter in system, the position of noise window is calculated.CP is defined in LTE system under different bandwidth The T of protection interval CPSNumber is NCP, TSIndicate sampling time interval, FFT points are NFFT, sub-carrier number NSCIf pilot tone FFT length when frequency domain accordingly transforms to time domain uses NSC/ 6, then the time-domain position of time delay maximum diameter can indicate are as follows:
In view of using inverse discrete Fourier transform (Inverse Discrete Fourier Transform, IDFT) The power leakage of signal may be occurred for frequency-domain transform to time domain by transformation, can retain NFFTIn NleakDiameter, last is effective The range of diameter is [NFFT-Nleak:N-1,0:Nτ], noise window is [Nτ:NFFT-Nleak]。
If adjacent area timing and local area there are it is larger in advance or lag, all may cause effective diameter exit window, i.e. noise window In the search space inaccuracy comprising effective diameter and effective diameter, the calculating of effective diameter thresholding will be directly affected, and then influence adjacent Area's Timing measurement.
Summary of the invention
The embodiment of the present invention provides estimation method, device and the terminal of a kind of timing offset, to solve in adjacent area timing With local area there are it is larger in advance or lag, in the case where may cause effective diameter exit window, directly affect the meter of effective diameter thresholding The problem of calculating, and then influencing adjacent area Timing measurement.
Specific technical solution provided in an embodiment of the present invention is as follows:
The embodiment of the present invention provides a kind of timing offset estimation method, comprising:
Channel estimation, which is carried out, according to the public reference signal CRS of the adjacent cell of current area determines time domain channel estimation knot Fruit determines the first noise window power and peak power of the time domain channel estimated result；
The first effective diameter thresholding is determined according to the first noise window power and the peak power, according to the time domain Channel estimation results and the first effective diameter thresholding determine the first timing offset value of current area Yu the adjacent cell；
It is adjusted according to timing offset of the first timing offset value to the time domain channel estimated result, determines and adjust Second noise window power of the time domain channel estimated result after whole, according to the second noise window power and the peak power Determine the second effective diameter thresholding；
According to the time domain channel estimated result adjusted and the second effective diameter thresholding, to tap search space The the second timing offset value for scanning for determining current area and the adjacent cell, according to the first timing offset value and described Second timing offset value determines the timing offset between current area and the adjacent cell.
In possible embodiment, the method also includes:
According to time domain channel estimated result, the second effective diameter thresholding and the timing offset adjusted, Scan for determining the delay spread value of current area and the adjacent cell to tap search space.
In possible embodiment, it is true that channel estimation is carried out according to the public reference signal CRS of the adjacent cell of current area Domain channel estimation results, comprising:
Least-squares estimation, which is carried out, according to the CRS of the adjacent cell obtains channel estimation in frequency domain as a result, believing the frequency domain Road estimated result carries out inverse discrete Fourier transform, obtains the time domain channel estimated result.
In possible embodiment, the first noise window power and peak work of the time domain channel estimated result are determined Rate, comprising:
Calculate the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, it indicates are as follows:Its In,Indicate the time domain channel estimation of the column pilot tone of port p As a result, r indicates receiving antenna number index, NFFTIndicate FFT points；
According to the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, determine the first noise window power are as follows:Wherein, Nτ Indicate the time-domain position of time delay maximum diameter, NleakIndicate the N retainedFFTDiameter item number；
According to the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, determine the peak power are as follows:
In possible embodiment, the first effective diameter is determined according to the first noise window power and the peak power Thresholding, comprising:
The product for calculating the first noise window power and the first coefficient obtains the first product, and calculates the peak work Rate and the product of the second coefficient obtain the second product；
Select the maximum value in first product and second product, however, it is determined that the maximum value is greater than or equal to institute Peak power is stated, determines that the first effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak value Power determines that the first effective diameter thresholding is the maximum value.
In possible embodiment, according to the time domain channel estimated result and the first effective diameter thresholding, determine First timing offset value of current area and the adjacent cell, comprising:
Determine the first timing offset value of current area Yu the adjacent cell are as follows:Wherein,P table Show that total port number, R indicate receiving antenna sum, wherein Γ(r,p)Indicate the first effective diameter thresholding.
It is inclined according to timing of the first timing offset value to the time domain channel estimated result in possible embodiment Difference is adjusted, comprising:
When the corresponding time-domain taps of first timing offset described in the time domain channel estimated result are moved to zero Each time-domain taps in the time domain channel estimated result are successively translated, obtain time domain channel adjusted and estimate by domain tap Count result are as follows:Wherein, k=0 ..., NFFT- 1, NFFT Indicate FFT points, τ1It indicates the first timing offset value, indicates that the time domain channel of the column pilot tone of port p estimates knot Fruit.
In possible embodiment, the second effective diameter is determined according to the second noise window power and the peak power Thresholding, comprising:
The product for calculating the second noise window power and third coefficient obtains third product, and calculates the peak work Rate and the product of the 4th coefficient obtain the 4th product；
Select the maximum value in the third product and the 4th product, however, it is determined that the maximum value is greater than or equal to institute Peak power is stated, determines that the second effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak value Power determines that the second effective diameter thresholding is the maximum value.
In possible embodiment, according to the time domain channel estimated result adjusted, the second effective diameter thresholding And the timing offset, scan for determining the delay spread value of current area and the adjacent cell to tap search space, Include:
According to the time domain channel estimated result adjusted, the second effective diameter thresholding, head path position is determined are as follows:I=-Nleak,…, Nτ, NτIndicate that the time-domain position of time delay maximum diameter, r indicate receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the call number of the pilot tone column of port p, indicates the second effective diameter thresholding, NleakIndicate the N retainedFFT's The item number of diameter, (τ '1+τ1) indicate the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing partially Difference；
Determine tail footpath position are as follows: Wherein, i=-Nleak,…,Nτ, r expression receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates end The call number of the pilot tone column of mouth p, indicates the second effective diameter thresholding, NleakIndicate the N retainedFFTDiameter item number, (τ’1+τ1) indicate the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing offset；
Determine the tail footpath position subtract the first path position it is resulting as a result, by the result be determined as current area with The delay spread value of the adjacent cell.
A kind of timing offset estimation device is additionally provided in the embodiment of the present invention, comprising:
First processing module, the public reference signal CRS progress channel estimation for the adjacent cell according to current area are true Domain channel estimation results determine the first noise window power and peak power of the time domain channel estimated result；
Second processing module, for determining the first effective diameter according to the first noise window power and the peak power Thresholding determines current area and the adjacent cell according to the time domain channel estimated result and the first effective diameter thresholding The first timing offset value；
Third processing module, for inclined according to timing of the first timing offset value to the time domain channel estimated result Difference is adjusted, and the second noise window power of time domain channel estimated result adjusted is determined, according to the second noise window function Rate and the peak power determine the second effective diameter thresholding；
Fourth processing module, for according to the time domain channel estimated result adjusted and the second effective diameter door Limit scans for determining the second timing offset value of current area and the adjacent cell to tap search space, according to described the One timing deviation and the second timing offset value determine the timing offset between current area and the adjacent cell.
In possible embodiment, further includes the 5th processing module, is used for:
According to time domain channel estimated result, the second effective diameter thresholding and the timing offset adjusted, Scan for determining the delay spread value of current area and the adjacent cell to tap search space.
In possible embodiment, the first processing module is specifically used for:
Least-squares estimation, which is carried out, according to the CRS of the adjacent cell obtains channel estimation in frequency domain as a result, believing the frequency domain Road estimated result carries out inverse discrete Fourier transform, obtains the time domain channel estimated result.
In possible embodiment, the first processing module is specifically used for:
Calculate the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, it indicates are as follows:Its In,Indicate the time domain channel estimation of the column pilot tone of port p As a result, r indicates receiving antenna number index, NFFTIndicate FFT points；
According to the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, determine the first noise window power are as follows:Wherein, Nτ Indicate the time-domain position of time delay maximum diameter, NleakIndicate the N retainedFFTDiameter item number；
According to the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, determine the peak power are as follows:
In possible embodiment, the Second processing module is specifically used for:
The product for calculating the first noise window power and the first coefficient obtains the first product, and calculates the peak work Rate and the product of the second coefficient obtain the second product；
Select the maximum value in first product and second product, however, it is determined that the maximum value is greater than or equal to institute Peak power is stated, determines that the first effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak value Power determines that the first effective diameter thresholding is the maximum value.
In possible embodiment, the Second processing module is specifically used for:
Determine the first timing offset value of current area Yu the adjacent cell are as follows:Wherein,P table Show that total port number, R indicate receiving antenna sum, wherein Γ(r,p)Indicate the first effective diameter thresholding.
In possible embodiment, the third processing module is specifically used for:
When the corresponding time-domain taps of first timing offset described in the time domain channel estimated result are moved to zero Each time-domain taps in the time domain channel estimated result are successively translated, obtain time domain channel adjusted and estimate by domain tap Count result are as follows:Wherein, k=0 ..., NFFT- 1, NFFT Indicate FFT points, τ1It indicates the first timing offset value, indicates that the time domain channel of the column pilot tone of port p estimates knot Fruit.
In possible embodiment, the third processing module is specifically used for:
The product for calculating the second noise window power and third coefficient obtains third product, and calculates the peak work Rate and the product of the 4th coefficient obtain the 4th product；
Select the maximum value in the third product and the 4th product, however, it is determined that the maximum value is greater than or equal to institute Peak power is stated, determines that the second effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak value Power determines that the second effective diameter thresholding is the maximum value.
In possible embodiment, the 5th processing module is specifically used for:
According to the time domain channel estimated result adjusted, the second effective diameter thresholding, head path position is determined are as follows:I=-Nleak,…, Nτ, NτIndicate that the time-domain position of time delay maximum diameter, r indicate receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the call number of the pilot tone column of port p, indicates the second effective diameter thresholding, NleakIndicate the N retainedFFT's The item number of diameter, (τ '1+τ1) indicate the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing partially Difference；
Determine tail footpath position are as follows:Wherein, i=- Nleak,…,Nτ, r expression receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the pilot tone of port p The call number of column indicates the second effective diameter thresholding, NleakIndicate the N retainedFFTDiameter item number, (τ '1+τ1) table Show the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing offset；
Determine the tail footpath position subtract the first path position it is resulting as a result, by the result be determined as current area with The delay spread value of the adjacent cell.
The embodiment of the invention also provides a kind of terminal, which mainly includes processor and memory, wherein memory In preserve preset program, processor executes following procedure for reading the program saved in memory, according to the program:
Channel estimation, which is carried out, according to the public reference signal CRS of the adjacent cell of current area determines time domain channel estimation knot Fruit determines the first noise window power and peak power of the time domain channel estimated result；
The first effective diameter thresholding is determined according to the first noise window power and the peak power, according to the time domain Channel estimation results and the first effective diameter thresholding determine the first timing offset value of current area Yu the adjacent cell；
It is adjusted according to timing offset of the first timing offset value to the time domain channel estimated result, determines and adjust Second noise window power of the time domain channel estimated result after whole, according to the second noise window power and the peak power Determine the second effective diameter thresholding；
According to the time domain channel estimated result adjusted and the second effective diameter thresholding, to tap search space The the second timing offset value for scanning for determining current area and the adjacent cell, according to the first timing offset value and described Second timing offset value determines the timing offset between current area and the adjacent cell.
In possible embodiment, processor according to the time domain channel estimated result adjusted, described second effectively Diameter thresholding and the timing offset scan for tap search space to determine that the time delay of current area and the adjacent cell expands Exhibition value.
In possible embodiment, processor carries out least-squares estimation according to the CRS of the adjacent cell and obtains frequency domain letter Road estimated result carries out inverse discrete Fourier transform to the channel estimation in frequency domain result, obtains the time domain channel estimation knot Fruit.
In possible embodiment, processor determines the first noise window power and peak of the time domain channel estimated result It is worth power, detailed process are as follows:
Calculate the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, it indicates are as follows:Its In,Indicate the time domain channel estimation of the column pilot tone of port p As a result, r indicates receiving antenna number index, NFFTIndicate FFT points；
According to the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, determine the first noise window power are as follows:Wherein, Nτ Indicate the time-domain position of time delay maximum diameter, NleakIndicate the N retainedFFTDiameter item number；
According to the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, determine the peak power are as follows:
In possible embodiment, processor calculates the first noise window power and the product of the first coefficient obtains first Product, and the calculating peak power and the product of the second coefficient obtain the second product；
Select the maximum value in first product and second product, however, it is determined that the maximum value is greater than or equal to the peak It is worth power, determines that the first effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak power, determines that first has Effect diameter thresholding is the maximum value.
In possible embodiment, processor determines the first timing offset value of current area Yu the adjacent cell are as follows:Wherein,P table Show that total port number, R indicate receiving antenna sum, wherein Γ(r, p)Indicate the first effective diameter thresholding.
In possible embodiment, processor is according to the first timing offset value to the time domain channel estimated result Timing offset is adjusted, and has process are as follows:
When the corresponding time-domain taps of first timing offset described in the time domain channel estimated result are moved to zero Each time-domain taps in the time domain channel estimated result are successively translated, obtain time domain channel adjusted and estimate by domain tap Count result are as follows:, wherein k=0 ..., NFFT- 1, NFFTTable Show that FFT counts, τ1It indicates the first timing offset value, indicates that the time domain channel of the column pilot tone of port p estimates knot Fruit.
In possible embodiment, processor determines the process of the second effective diameter thresholding are as follows:
The product for calculating the second noise window power and third coefficient obtains third product, and calculates the peak work Rate and the product of the 4th coefficient obtain the 4th product；The maximum value in the third product and the 4th product is selected, if really The fixed maximum value is greater than or equal to the peak power, determines that the second effective diameter thresholding is the peak power, if really The fixed maximum value is less than the peak power, determines that the second effective diameter thresholding is the maximum value.
In possible embodiment, processor according to the time domain channel estimated result adjusted, described second effectively Diameter thresholding determines head path position are as follows: I=-Nleak,…,Nτ, NτIndicate that the time-domain position of time delay maximum diameter, r indicate receiving antenna number index, NFFTIndicate FFT points, p It indicates port numbers, indicates the call number of the pilot tone column of port p, indicate the second effective diameter thresholding, NleakIt indicates The N of reservationFFTDiameter item number, (τ '1+τ1) indicate the timing offset, τ1Indicate first timing offset, τ '1Indicate institute State the second timing offset；
Determine tail footpath position are as follows:Wherein, i=- Nleak,…,Nτ, r expression receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the pilot tone of port p The call number of column indicates the second effective diameter thresholding, NleakIndicate the N retainedFFTDiameter item number, (τ '1+τ1) table Show the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing offset；
Determine the tail footpath position subtract the first path position it is resulting as a result, by the result be determined as current area with The delay spread value of the adjacent cell.
Based on the above-mentioned technical proposal, in the embodiment of the present invention, the case where there are time-delay deviations for adjacent cell and current area Under, channel estimation is carried out according to the CRS of adjacent cell and obtains time domain channel estimated result, determines the of the time domain channel estimated result One noise window power and peak power are adopted after determining the first effective diameter thresholding according to the first noise window power and peak power The first timing offset value that thick synchronization gain progress slightly synchronizes is carried out with the first effective diameter thresholding, using the first timing offset value pair The timing offset of time domain channel estimated result carries out thick synchronous adjustment, determines that the second of time domain channel estimated result adjusted is made an uproar Sound window power determines the second effective diameter thresholding according to the second noise window power and peak power, using the second effective diameter thresholding It scans for determining the second timing offset value of precise synchronization to tap search space, is deposited so as to the timing in adjacent area with local area It is larger in advance or lag may cause effective diameter exit window in the case where, by coarse timing synchronization to time domain channel estimation carry out Synchronous adjustment so that effective diameter is without falling into noise window, and then obtains effective effective diameter thresholding, and then obtains and relatively accurate determines When estimation of deviation measurement and delay spread measurement.
Detailed description of the invention
Fig. 1 is the implementation process schematic diagram of existing delay spread algorithm for estimating；
Fig. 2 is the method flow schematic diagram of timing offset estimation in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of timing offset estimation device in the embodiment of the present invention；
Fig. 4 is terminal structure schematic diagram in the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts All other embodiment, shall fall within the protection scope of the present invention.
In the embodiment of the present invention, as shown in Fig. 2, the method detailed process of timing offset estimation is as follows:
Step 201: channel estimation being carried out according to the CRS of the adjacent cell of current area and determines time domain channel estimated result, really The the first noise window power and peak power of domain channel estimation results.
Specifically, channel estimation is carried out according to the CRS of the adjacent cell of current area and determines time domain channel estimated result, specifically Are as follows:
According to the CRS of adjacent cell carry out least square (Least Square, LS) estimation obtain channel estimation in frequency domain as a result, Channel estimation in frequency domain result is expressed as formula (1):
Wherein, r indicates that receiving antenna number index, p indicate antenna end slogan index,Indicate the pilot tone columns of port p, Assuming that receiving antenna sum is R, total port number is P；
To channel estimation in frequency domain resultInverse discrete Fourier transform is carried out, time domain channel estimated result is obtainedIt is expressed as formula (2):
Wherein,Indicate the column pilot tone of port p Time domain channel estimated result, NFFTIndicate FFT points, r indicates receiving antenna number index.
Specifically, it is determined that time domain channel estimated result the first noise window power and peak power detailed process such as Under:
Square of the mould of the time domain channel estimated result of each column pilot tone of each port in time domain channel estimated result is calculated, It is expressed as formula (3):
Formula (3)
Wherein,Indicate port p column pilot tone when Domain channel estimation results, r indicate receiving antenna number index, NFFTIndicate FFT points；
According to square of the mould of the time domain channel estimated result of each column pilot tone of port each in time domain channel estimated result, Determine that the first noise window power is shown in formula (4):
Wherein, NτIndicate the time-domain position of time delay maximum diameter, NleakIndicate the N retainedFFTDiameter item number；
According to square of the mould of the time domain channel estimated result of each column pilot tone of port each in time domain channel estimated result, Determine that peak power is shown in formula (5):
Step 202: the first effective diameter thresholding being determined according to the first noise window power and peak power, according to time domain channel Estimated result and the first effective diameter thresholding determine the first timing offset value of current area and adjacent cell.
Specifically, it is determined that the process of the first effective diameter thresholding are as follows: calculate the product of the first noise window power and the first coefficient The first product is obtained, and calculating peak power and the product of the second coefficient obtain the second product；Select the first product and second Maximum value in product, however, it is determined that the maximum value is greater than or equal to the peak power, determines that the first effective diameter thresholding is the peak value Power, however, it is determined that the maximum value is less than the peak power, determines that the first effective diameter thresholding is the maximum value.
Wherein, the first coefficient and the second coefficient can be determined by emulation.
First effective diameter thresholding is indicated with formula (6) are as follows:
Wherein,Indicate the first noise window power,Indicate peak power, βnoiseIndicate the first coefficient, βmaxTable Show the second coefficient.If met according to the first effective diameter thresholding that formula (6) determineThen have again to first Imitate diameter thresholding assignment are as follows:
Specifically, according to time domain channel estimated result and the first effective diameter thresholding, current area and adjacent cell are determined First timing offset value, detailed process are as follows:
The the first timing offset value for determining current area and adjacent cell is shown in formula (7):
Wherein,I=- Nleak,…,Nτ, P indicates total port number, and R indicates receiving antenna sum, wherein Γ(r,p)Indicate the first effective diameter thresholding.Its In, physical significance be in i=-Nleak,…,NτSearch range in find so that being greater than or equal to Γ(r,p)Minimum index.
Step 203: the timing offset of time domain channel estimation results being adjusted according to the first timing offset value, determines and adjusts Second noise window power of the time domain channel estimated result after whole determines second according to the second noise window power and peak power Effective diameter thresholding.
Wherein, the value range of noise window is to preset.
Specifically, the timing offset of time domain channel estimation results is adjusted according to the first timing offset value, specifically:
The corresponding time-domain taps of first timing offset are moved to zero time-domain taps and obtain the estimation of the second time domain channel As a result for shown in formula (8):
Wherein, k=0 ..., NFFT- 1, NFFTIndicate FFT points, τ1Indicate the first timing offset value,Indicate port The of pThe time domain channel estimated result of column pilot tone.
Respectively according to formula (4) and formula (5), according to time domain channel estimated result adjusted, to every receiving antenna Each port is in noise window [Nτ:NFFT-Nleak] carry out noise power calculation in range and obtain the second noise window power Third coefficient, which is arranged, isThe 4th coefficient, which is arranged, isWherein, third coefficient and the 4th coefficient can be true by emulating It is fixed.
Specifically, it is determined that the process of the second effective diameter thresholding are as follows: calculate the product of the second noise window power and third coefficient Third product is obtained, and calculating peak power and the product of the 4th coefficient obtain the 4th product；
Select the maximum value in third product and the 4th product, however, it is determined that the maximum value is greater than or equal to peak power, really Fixed second effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak power, determines the second effective diameter thresholding For the maximum value.
Second effective diameter thresholding is indicated with formula (9) are as follows:
If met according to the second effective diameter thresholding that formula (9) determineThen again to the second effective diameter Thresholding assignment are as follows:
Step 204: according to time domain channel estimated result adjusted and the second effective diameter thresholding, to tap search space The the second timing offset value for scanning for determining current area and adjacent cell, according to the first timing offset value and the second timing offset It is worth the timing offset determined between current area and adjacent cell.
Wherein, the value range of tap search space be preset, specifically, the value range of tap search space with The value range of noise window is complementary relationship, it is assumed that search space total length is NFFTIf a part point setting in search space For spatial noise, then another part is tap search space.
Specifically, it is determined that tap search space [N after the second effective diameter thresholdingFFT-Nleak:NFFT-1,0:Nτ] searched Rope obtains the second timing offset value τ 1 ' of current area and adjacent cell, is indicated with formula (10) and formula (11) are as follows:
Wherein, i=-Nleak..., Nτ, P indicates total port number, and R indicates receiving antenna sum, whereinIndicate the Two effective diameter thresholdings.Wherein, the peak power of time domain channel estimated result adjusted and the time domain channel before adjustment are estimated As a result peak power is identical.
Specifically, calculate the first timing offset value and the second timing offset value and, be determined as resulting currently with value Timing offset between cell and adjacent cell.
In implementation, it can also be determined according to time domain channel estimated result adjusted, the second effective diameter thresholding and determination When deviation, to tap search space scan for determine current area and adjacent cell delay spread value.
Specifically, according to time domain channel estimated result adjusted, the second effective diameter thresholding, determine that head path position is formula (12) shown in:
Wherein, i=-Nleak,…,Nτ, NτIndicate that the time-domain position of time delay maximum diameter, r indicate receiving antenna number index, NFFT Indicating FFT points, p indicates port numbers,Indicate the call number of the pilot tone column of port p,Indicate the second effective diameter Thresholding, NleakIndicate the N retainedFFTDiameter item number, (τ '1+τ1) indicate timing offset, τ1Indicate the first timing offset, τ '1Table Show the second timing offset；
Determine that tail footpath position is shown in formula (13):
Wherein, i=-Nleak,…,Nτ, r expression receiving antenna number index, NFFTIndicating FFT points, p indicates port numbers,Indicate the call number of the pilot tone column of port p,Indicate the second effective diameter thresholding, NleakIndicate the N retainedFFT's The item number of diameter, (τ '1+τ1) indicate timing offset, τ1Indicate the first timing offset, τ '1Indicate the second timing offset；
Determine tail footpath position subtract first path position it is resulting as a result, by the result be determined as current area and adjacent cell when Prolong expanding value.
Wherein, in formula (12) and formula (13)Its In,Indicate the time domain adjusted of the column pilot tone of port p Channel estimation results, r indicate receiving antenna number index, NFFTIndicate FFT points.
Calculating below by way of two specific embodiments to the timing offset and delay spread that are provided in the embodiment of the present invention Process is illustrated.
Specific embodiment one, under LTE FEICIC macro-pico deployment scenario, having a bandwidth is 10MHz macrocell A, having a bandwidth is the Pico cell B of 10MHz, and UE is in the edge of Pico cell, and the CRS by macrocell is capable and experienced It disturbs, A cell reaches UE and the time delay of B cell arrival UE is advanced by 3us, and specific implementation step is as follows:
Step 1, the A LS for carrying out CRS in adjacent area is estimated, obtains channel estimation in frequency domain result
Wherein,R indicates that receiving antenna number index, p indicate antenna end slogan rope Draw,Indicate the pilot tone columns of port p, it is assumed that receiving antenna sum is R, and total port number is P.
Step 2, it carries out IDFT to channel estimation in frequency domain result and converts to obtain time domain channel estimated result to be expressed asWherein,Indicate the time domain channel estimation of the column pilot tone of port p As a result, NFFTIndicate FFT points, r indicates receiving antenna number index, wherein NFFT=256.
Step 3, wherein according to the first noise window general power of calculating and peak power,
Indicate the time domain channel of the column pilot tone of port p Estimated result, r indicate receiving antenna number index, NFFTIndicate FFT points.NτIndicate the time-domain position of time delay maximum diameter, NleakTable Show the N of reservationFFTDiameter item number.
Wherein,
Step 4, coarse timing synchronization is carried out, the first timing offset value τ is obtained1。
Specifically, the first effective diameter thresholding is setWherein, table Show the first noise window power, indicates the first peak power, βnoiseIndicate the first coefficient, βmaxIndicate the second coefficient.Wherein, βmaxSetting value is greater than βnoise, so that there is the first effect diameter thresholding relatively high, first diameter power is maximum under General System, effective diameter door Limit the higher relative precision that can guarantee timing estimation.βmaxIt can be determined by emulation.If determine according to formula first has Diameter thresholding is imitated to meet then again to the first effective diameter thresholding assignment are as follows:
First timing offset value τ1It indicates are as follows:Wherein,P table Show that total port number, R indicate receiving antenna sum, wherein Γ(r,p)Indicate the first effective diameter thresholding.
Step 5, according to the first timing offset value τ1Calculate the second effective diameter thresholding
Specifically, according to τ1Adjustment physical meaning is that coarse timing synchronization being estimated to, corresponding time-domain taps are mobile It obtains finally obtaining time domain channel estimated result adjusted to the position of the 0th time-domain taps specific It is as follows:Wherein, k=0 ..., NFFT- 1, NFFTIt indicates FFT points, τ1It indicates the first timing offset value, indicates the time domain channel estimated result of the column pilot tone of port p.
Be arranged and to every receiving antenna, each port in noise window [Nτ:NFFT-Nleak] Being calculated according to the peak work in every receiving antenna, each port for noise power is carried out in range Rate and noise power determineWherein, and It can be determined by emulation.Again to second if the second effective diameter thresholding determined according to formula meets Effective diameter thresholding assignment are as follows:
Step 6, synchro measure is timed to time domain channel estimation and delay spread measures.
Specifically, to tap search space [NFFT-Nleak:NFFT-1,0:Nτ] scan for, obtain Timing Synchronization measured value Or delay spread measured value, wherein timing offset measured value and delay spread measured value can be respectively set differentWithTo meet the needs of different.
Specifically, timing offset measured value is expressed as τ '1+τ1, τ '1Acquisition process are as follows:Wherein,P table Show total port number, R indicates receiving antenna sum, wherein indicating the second effective diameter thresholding.Wherein,
Specifically, the acquisition process of delay spread measured value are as follows:
Determine that head path position is
Wherein, I=-Nleak,…,Nτ, NτIndicate the time-domain position of time delay maximum diameter；
Determine that tail footpath position is
Wherein, I=-Nleak,…,Nτ；
Determine that tail footpath position subtracts that first path position is resulting as a result, the time delay that the result is current area and adjacent cell expands Exhibition value.
Specific embodiment two, under LTE FEICIC macro-pico deployment scenario, having a bandwidth is 10MHz macrocell A, having a bandwidth is the Pico cell B of 10MHz, and UE is in the edge of Pico cell, and the CRS by macrocell is capable and experienced It disturbs, A cell reaches UE and the time delay of B cell arrival UE has lagged 3us, step 1 in specific implementation process and specific embodiment one The description of~step 6 is identical, and details are not described herein again.
Based on the same inventive concept, a kind of timing offset estimation device is additionally provided in the embodiment of the present invention, the device Specific implementation can be found in the description of above method embodiment, and overlaps will not be repeated, as shown in figure 3, the device mainly includes:
First processing module 301, the public reference signal CRS for the adjacent cell according to current area carry out channel estimation It determines time domain channel estimated result, determines the first noise window power and peak power of the time domain channel estimated result；
Second processing module 302, for determining that first has according to the first noise window power and the peak power It imitates diameter thresholding and current area and the neighbour is determined according to the time domain channel estimated result and the first effective diameter thresholding First timing offset value of cell；
Third processing module 303, for being determined according to the first timing offset value the time domain channel estimated result When deviation be adjusted, the second noise window power of time domain channel estimated result adjusted is determined, according to second noise Window power and the peak power determine the second effective diameter thresholding；
Fourth processing module 304 is used for according to the time domain channel estimated result adjusted and described second effectively Diameter thresholding scans for determining the second timing offset value of current area and the adjacent cell, according to institute to tap search space It states the first timing offset value and the second timing offset value determines timing offset between current area and the adjacent cell.
In implementation, further includes the 5th processing module 305, is used for:
According to time domain channel estimated result, the second effective diameter thresholding and the timing offset adjusted, Scan for determining the delay spread value of current area and the adjacent cell to tap search space.
In implementation, the first processing module is specifically used for:
Least-squares estimation, which is carried out, according to the CRS of the adjacent cell obtains channel estimation in frequency domain as a result, believing the frequency domain Road estimated result carries out inverse discrete Fourier transform, obtains the time domain channel estimated result.
In implementation, the first processing module is specifically used for:
Calculate the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, it indicates are as follows:Its In,Indicate the time domain channel estimation of the column pilot tone of port p As a result, r indicates receiving antenna number index, NFFTIndicate FFT points；
According to the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, determine the first noise window power are as follows:Wherein, Nτ Indicate the time-domain position of time delay maximum diameter, NleakIndicate the N retainedFFTDiameter item number；
According to the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, determine the peak power are as follows:
In implementation, the Second processing module is specifically used for:
The product for calculating the first noise window power and the first coefficient obtains the first product, and calculates the peak work Rate and the product of the second coefficient obtain the second product；
Select the maximum value in first product and second product, however, it is determined that the maximum value is greater than or equal to the peak It is worth power, determines that the first effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak power, determines that first has Effect diameter thresholding is the maximum value.
In implementation, the Second processing module is specifically used for:
Determine the first timing offset value of current area Yu the adjacent cell are as follows:Wherein,P table Show that total port number, R indicate receiving antenna sum, wherein Γ(r,p)Indicate the first effective diameter thresholding.
In implementation, the third processing module is specifically used for:
When the corresponding time-domain taps of first timing offset described in the time domain channel estimated result are moved to zero Each time-domain taps in the time domain channel estimated result are successively translated, obtain time domain channel adjusted and estimate by domain tap Count result are as follows:Wherein, k=0 ..., NFFT- 1, NFFT Indicate FFT points, τ1It indicates the first timing offset value, indicates the time domain channel estimation of the column pilot tone of port p As a result.
In implementation, the third processing module is specifically used for:
The product for calculating the second noise window power and third coefficient obtains third product, and calculates the peak work Rate and the product of the 4th coefficient obtain the 4th product；
Select the maximum value in the third product and the 4th product, however, it is determined that the maximum value is greater than or equal to institute Peak power is stated, determines that the second effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak value Power determines that the second effective diameter thresholding is the maximum value.
In implementation, the 5th processing module is specifically used for:
According to the time domain channel estimated result adjusted, the second effective diameter thresholding, head path position is determined are as follows:I=-Nleak,…, Nτ, NτIndicate that the time-domain position of time delay maximum diameter, r indicate receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the call number of the pilot tone column of port p, indicates the second effective diameter thresholding, NleakIndicate the N retainedFFT's The item number of diameter, (τ '1+τ1) indicate the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing partially Difference；
Determine tail footpath position are as follows:Wherein, i=- Nleak,…,Nτ, r expression receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the pilot tone of port p The call number of column indicates the second effective diameter thresholding, NleakIndicate the N retainedFFTDiameter item number, (τ '1+τ1) table Show the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing offset；
Determine the tail footpath position subtract the first path position it is resulting as a result, by the result be determined as current area with The delay spread value of the adjacent cell.
Based on the same inventive concept, a kind of terminal is additionally provided in the embodiment of the present invention, the specific implementation of the terminal can be joined See the specific descriptions of above method embodiment, overlaps will not be repeated, as shown in figure 4, the terminal mainly includes processor 401 With memory 402, wherein preserve preset program in memory 402, processor 401 is saved for reading in memory 402 Program, according to the program execute following procedure:
Channel estimation, which is carried out, according to the public reference signal CRS of the adjacent cell of current area determines time domain channel estimation knot Fruit determines the first noise window power and peak power of the time domain channel estimated result；
The first effective diameter thresholding is determined according to the first noise window power and the peak power, according to the time domain Channel estimation results and the first effective diameter thresholding determine the first timing offset value of current area Yu the adjacent cell；
It is adjusted according to timing offset of the first timing offset value to the time domain channel estimated result, determines and adjust Second noise window power of the time domain channel estimated result after whole, according to the second noise window power and the peak power Determine the second effective diameter thresholding；
According to the time domain channel estimated result adjusted and the second effective diameter thresholding, to tap search space The the second timing offset value for scanning for determining current area and the adjacent cell, according to the first timing offset value and described Second timing offset value determines the timing offset between current area and the adjacent cell.
In implementation, processor according to the time domain channel estimated result adjusted, the second effective diameter thresholding and The timing offset scans for determining the delay spread value of current area and the adjacent cell to tap search space.
In implementation, processor according to the CRS of the adjacent cell carry out least-squares estimation obtain channel estimation in frequency domain as a result, Inverse discrete Fourier transform is carried out to the channel estimation in frequency domain result, obtains the time domain channel estimated result.
In implementation, processor determines the first noise window power and peak power of the time domain channel estimated result, tool Body process are as follows:
Calculate the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, it indicates are as follows:Its In,Indicate the time domain channel estimation of the column pilot tone of port p As a result, r indicates receiving antenna number index, NFFTIndicate FFT points；
According to the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, determine the first noise window power are as follows:Wherein, NτIndicate the time-domain position of time delay maximum diameter, NleakIndicate the N retainedFFTDiameter item number；
According to the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result Square, determine the peak power are as follows:
In implementation, processor calculates the first noise window power and the product of the first coefficient obtains the first product, and The product for calculating the peak power and the second coefficient obtains the second product；
Select the maximum value in first product and second product, however, it is determined that the maximum value is greater than or equal to the peak It is worth power, determines that the first effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak power, determines that first has Effect diameter thresholding is the maximum value.
In implementation, processor determines the first timing offset value of current area Yu the adjacent cell are as follows:Wherein,P table Show that total port number, R indicate receiving antenna sum, wherein Γ(r,p)Indicate the first effective diameter thresholding.
In implementation, processor according to the first timing offset value to the timing offset of the time domain channel estimated result into Row adjustment, has process are as follows:
When the corresponding time-domain taps of first timing offset described in the time domain channel estimated result are moved to zero Each time-domain taps in the time domain channel estimated result are successively translated, obtain time domain channel adjusted and estimate by domain tap Count result are as follows:Wherein, k=0 ..., NFFT- 1, NFFT Indicate FFT points, τ1It indicates the first timing offset value, indicates the time domain channel estimation of the column pilot tone of port p As a result.
In implementation, processor determines the process of the second effective diameter thresholding are as follows:
The product for calculating the second noise window power and third coefficient obtains third product, and calculates the peak work Rate and the product of the 4th coefficient obtain the 4th product；The maximum value in the third product and the 4th product is selected, if really The fixed maximum value is greater than or equal to the peak power, determines that the second effective diameter thresholding is the peak power, if really The fixed maximum value is less than the peak power, determines that the second effective diameter thresholding is the maximum value.
In implementation, processor is determined according to the time domain channel estimated result adjusted, the second effective diameter thresholding First path position are as follows: I=-Nleak,…,Nτ, NτIndicate that the time-domain position of time delay maximum diameter, r indicate receiving antenna number index, NFFTIndicate FFT points, p It indicates port numbers, indicates the call number of the pilot tone column of port p, indicate the second effective diameter thresholding, NleakIt indicates The N of reservationFFTDiameter item number, (τ '1+τ1) indicate the timing offset, τ1Indicate first timing offset, τ '1Indicate institute State the second timing offset；
Determine tail footpath position are as follows:Wherein, i=- Nleak,…,Nτ, r expression receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the pilot tone of port p The call number of column indicates the second effective diameter thresholding, NleakIndicate the N retainedFFTDiameter item number, (τ '1+τ1) table Show the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing offset；
Determine the tail footpath position subtract the first path position it is resulting as a result, by the result be determined as current area with The delay spread value of the adjacent cell.
Wherein, it is connected between processor and memory by bus, bus architecture may include any number of interconnection The various circuits of bus and bridge, the memory that the one or more processors and memory specifically represented by processor represent link Together.Bus architecture can also be by various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like It links together, these are all it is known in the art, and therefore, it will not be further described herein.Bus interface mentions For interface.Processor is responsible for managing bus architecture and common processing, and memory can store processor and execute operation when institute The data used.
Based on the above-mentioned technical proposal, in the embodiment of the present invention, the case where there are time-delay deviations for adjacent cell and current area Under, channel estimation is carried out according to the CRS of adjacent cell and obtains time domain channel estimated result, determines the of the time domain channel estimated result One noise window power and peak power are adopted after determining the first effective diameter thresholding according to the first noise window power and peak power The first timing offset value that thick synchronization gain progress slightly synchronizes is carried out with the first effective diameter thresholding, using the first timing offset value pair The timing offset of time domain channel estimated result carries out thick synchronous adjustment, determines that the second of time domain channel estimated result adjusted is made an uproar Sound window power determines the second effective diameter thresholding according to the second noise window power and peak power, using the second effective diameter thresholding It scans for determining the second timing offset value of precise synchronization to tap search space, is deposited so as to the timing in adjacent area with local area It is larger in advance or lag may cause effective diameter exit window in the case where, by coarse timing synchronization to time domain channel estimation carry out Synchronous adjustment so that effective diameter is without falling into noise window, and then obtains effective effective diameter thresholding, and then obtains and relatively accurate determines When estimation of deviation measurement and delay spread measurement.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more, The shape for the computer program product implemented in usable storage medium (including but not limited to magnetic disk storage and optical memory etc.) Formula.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions each in flowchart and/or the block diagram The combination of process and/or box in process and/or box and flowchart and/or the block diagram.It can provide these computers Processor of the program instruction to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices To generate a machine, so that generating use by the instruction that computer or the processor of other programmable data processing devices execute In the dress for realizing the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram It sets.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to include these modifications and variations.

Claims (18)

1. a kind of timing offset estimation method characterized by comprising
Channel estimation is carried out according to the public reference signal CRS of the adjacent cell of current area and determines time domain channel estimated result, really The the first noise window power and peak power of the fixed time domain channel estimated result；
The first effective diameter thresholding is determined according to the first noise window power and the peak power, according to the time domain channel Estimated result and the first effective diameter thresholding determine the first timing offset value of current area Yu the adjacent cell；
It is adjusted according to timing offset of the first timing offset value to the time domain channel estimated result, after determining adjustment Time domain channel estimated result the second noise window power, determined according to the second noise window power and the peak power Second effective diameter thresholding；
According to the time domain channel estimated result adjusted and the second effective diameter thresholding, tap search space is carried out The the second timing offset value for determining current area and the adjacent cell is searched for, according to the first timing offset value and described second Timing offset value determines the timing offset between current area and the adjacent cell.
2. the method as described in claim 1, which is characterized in that the method also includes:
According to time domain channel estimated result, the second effective diameter thresholding and the timing offset adjusted, to pumping Head search space scans for determining the delay spread value of current area and the adjacent cell.
3. method according to claim 1 or 2, which is characterized in that according to the public reference signal of the adjacent cell of current area CRS carries out channel estimation and determines time domain channel estimated result, comprising:
Least-squares estimation, which is carried out, according to the CRS of the adjacent cell obtains channel estimation in frequency domain as a result, estimating to the frequency domain channel It counts result and carries out inverse discrete Fourier transform, obtain the time domain channel estimated result.
4. method according to claim 1 or 2, which is characterized in that determine the first noise of the time domain channel estimated result Window power and peak power, comprising:
Square of the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result is calculated, It indicates are as follows:Wherein, indicate that the time domain channel of the column pilot tone of port p estimates knot Fruit, r indicate receiving antenna number index, NFFTIndicate FFT points；
According to square of the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result, Determine the first noise window power are as follows:Wherein, NτIt indicates The time-domain position of time delay maximum diameter, NleakIndicate the N retainedFFTDiameter item number；
According to square of the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result, Determine the peak power are as follows:
5. method as claimed in claim 4, which is characterized in that according to the first noise window power and the peak power Determine the first effective diameter thresholding, comprising:
The product for calculating the first noise window power and the first coefficient obtains the first product, and calculate the peak power with The product of second coefficient obtains the second product；
Select the maximum value in first product and second product, however, it is determined that the maximum value is greater than or equal to the peak It is worth power, determines that the first effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak power, Determine that the first effective diameter thresholding is the maximum value.
6. method as claimed in claim 5, which is characterized in that had according to the time domain channel estimated result and described first Diameter thresholding is imitated, determines the first timing offset value of current area Yu the adjacent cell, comprising:
Determine the first timing offset value of current area Yu the adjacent cell are as follows:Wherein,P table Show that total port number, R indicate receiving antenna sum, wherein Γ(r,p)Indicate the first effective diameter thresholding.
7. method according to claim 1 or 2, which is characterized in that believed according to the first timing offset value the time domain The timing offset of road estimated result is adjusted, comprising:
The corresponding time-domain taps of first timing offset described in the time domain channel estimated result are moved to zero time domain to take out Head successively translates each time-domain taps in the time domain channel estimated result, obtains time domain channel estimation knot adjusted Fruit are as follows:Wherein, k=0 ..., NFFT- 1, NFFTIt indicates FFT points, τ1It indicates the first timing offset value, indicates the time domain channel estimated result of the column pilot tone of port p.
8. the method for claim 7, which is characterized in that according to the second noise window power and the peak power Determine the second effective diameter thresholding, comprising:
The product for calculating the second noise window power and third coefficient obtains third product, and calculate the peak power with The product of 4th coefficient obtains the 4th product；
Select the maximum value in the third product and the 4th product, however, it is determined that the maximum value is greater than or equal to the peak It is worth power, determines that the second effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak power, Determine that the second effective diameter thresholding is the maximum value.
9. method according to claim 2, which is characterized in that according to the time domain channel estimated result adjusted, described Second effective diameter thresholding and the timing offset scan for tap search space to determine current area and the adjacent cell Delay spread value, comprising:
According to the time domain channel estimated result adjusted, the second effective diameter thresholding, head path position is determined are as follows:I=-Nleak,…, Nτ, NτIndicate that the time-domain position of time delay maximum diameter, r indicate receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the call number of the pilot tone column of port p, indicates the second effective diameter thresholding, NleakIndicate the N retainedFFT's The item number of diameter, (τ '1+τ1) indicate the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing partially Difference；
Determine tail footpath position are as follows:Wherein, i=- Nleak,…,Nτ, r expression receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the pilot tone institute of port p In the call number of column, the second effective diameter thresholding, N are indicatedleakIndicate the N retainedFFTDiameter item number, (τ '1+τ1) indicate The timing offset, τ1Indicate first timing offset, τ '1Indicate second timing offset；
Determine the tail footpath position subtract the first path position it is resulting as a result, by the result be determined as current area with it is described The delay spread value of adjacent cell.
10. a kind of timing offset estimation device characterized by comprising
First processing module, when carrying out channel estimation for the public reference signal CRS according to the adjacent cell of current area and determining Domain channel estimation results determine the first noise window power and peak power of the time domain channel estimated result；
Second processing module, for determining the first effective diameter door according to the first noise window power and the peak power Limit determines current area and the adjacent cell according to the time domain channel estimated result and the first effective diameter thresholding First timing offset value；
Third processing module, for according to the first timing offset value to the timing offset of the time domain channel estimated result into Row adjustment, determine the second noise window power of time domain channel estimated result adjusted, according to the second noise window power with And the peak power determines the second effective diameter thresholding；
Fourth processing module is used for according to the time domain channel estimated result adjusted and the second effective diameter thresholding, Scan for determining the second timing offset value of current area and the adjacent cell to tap search space, it is fixed according to described first When deviation and the second timing offset value determine the timing offset between current area and the adjacent cell.
11. device as claimed in claim 10, which is characterized in that further include the 5th processing module, be used for:
According to time domain channel estimated result, the second effective diameter thresholding and the timing offset adjusted, to pumping Head search space scans for determining the delay spread value of current area and the adjacent cell.
12. device as described in claim 10 or 11, which is characterized in that the first processing module is specifically used for:
Least-squares estimation, which is carried out, according to the CRS of the adjacent cell obtains channel estimation in frequency domain as a result, estimating to the frequency domain channel It counts result and carries out inverse discrete Fourier transform, obtain the time domain channel estimated result.
13. device as described in claim 10 or 11, which is characterized in that the first processing module is specifically used for:
Square of the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result is calculated, It indicates are as follows:Wherein, indicate that the time domain channel of the column pilot tone of port p estimates knot Fruit, r indicate receiving antenna number index, NFFTIndicate FFT points；
According to square of the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result, Determine the first noise window power are as follows:Wherein, NτIt indicates The time-domain position of time delay maximum diameter, NleakIndicate the N retainedFFTDiameter item number；
According to square of the mould of the time domain channel estimated result of each column pilot tone of each port in the time domain channel estimated result, Determine the peak power are as follows:
14. device as claimed in claim 13, which is characterized in that the Second processing module is specifically used for:
The product for calculating the first noise window power and the first coefficient obtains the first product, and calculate the peak power with The product of second coefficient obtains the second product；
Select the maximum value in first product and second product, however, it is determined that the maximum value is greater than or equal to the peak It is worth power, determines that the first effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak power, Determine that the first effective diameter thresholding is the maximum value.
15. device as claimed in claim 14, which is characterized in that the Second processing module is specifically used for:
Determine the first timing offset value of current area Yu the adjacent cell are as follows:Wherein,P table Show that total port number, R indicate receiving antenna sum, wherein Γ(r,p)Indicate the first effective diameter thresholding.
16. device as described in claim 10 or 11, which is characterized in that the third processing module is specifically used for:
The corresponding time-domain taps of first timing offset described in the time domain channel estimated result are moved to zero time domain to take out Head successively translates each time-domain taps in the time domain channel estimated result, obtains time domain channel estimation knot adjusted Fruit are as follows:Wherein, k=0 ..., NFFT- 1, NFFTIt indicates FFT points, τ1It indicates the first timing offset value, indicates the time domain channel estimated result of the column pilot tone of port p.
17. device as claimed in claim 16, which is characterized in that the third processing module is specifically used for:
The product for calculating the second noise window power and third coefficient obtains third product, and calculate the peak power with The product of 4th coefficient obtains the 4th product；
Select the maximum value in the third product and the 4th product, however, it is determined that the maximum value is greater than or equal to the peak It is worth power, determines that the second effective diameter thresholding is the peak power, however, it is determined that the maximum value is less than the peak power, Determine that the second effective diameter thresholding is the maximum value.
18. device as claimed in claim 11, which is characterized in that the 5th processing module is specifically used for:
According to the time domain channel estimated result adjusted, the second effective diameter thresholding, head path position is determined are as follows:I=-Nleak,…, Nτ, NτIndicate that the time-domain position of time delay maximum diameter, r indicate receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the call number of the pilot tone column of port p, indicates the second effective diameter thresholding, NleakIndicate the N retainedFFT's The item number of diameter, (τ '1+τ1) indicate the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing partially Difference；
Determine tail footpath position are as follows:Wherein, i=- Nleak,…,Nτ, r expression receiving antenna number index, NFFTIndicate FFT points, p indicates port numbers, indicates the pilot tone of port p The call number of column indicates the second effective diameter thresholding, NleakIndicate the N retainedFFTDiameter item number, (τ '1+τ1) table Show the timing offset, τ1Indicate first timing offset, τ '1Indicate second timing offset；
Determine the tail footpath position subtract the first path position it is resulting as a result, by the result be determined as current area with it is described The delay spread value of adjacent cell.
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