CN109672635A - A kind of relativity of time domain estimation method, device and equipment - Google Patents

A kind of relativity of time domain estimation method, device and equipment Download PDF

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Publication number
CN109672635A
CN109672635A CN201710965874.4A CN201710965874A CN109672635A CN 109672635 A CN109672635 A CN 109672635A CN 201710965874 A CN201710965874 A CN 201710965874A CN 109672635 A CN109672635 A CN 109672635A
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time domain
nlos
estimation
domain channel
los
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CN109672635B (en
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金晓成
徐兵
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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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Priority to PCT/CN2018/109423 priority patent/WO2019076210A1/en
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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
    • H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
    • 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
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03821—Inter-carrier interference cancellation [ICI]
    • 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
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2642—Wavelet transform modulators

Abstract

The present invention provides a kind of relativity of time domain estimation method, device and equipment, is related to field of communication technology, to improve channel estimating performance.Relativity of time domain estimation method of the invention, comprising: the time domain channel of the time domain channel estimation and the non-part direct projection diameter NLOS that obtain pilot frequency locations direct projection diameter LOS portion respectively is estimated；Obtain the power spectral migration and maximum Doppler extension of the part NLOS；According to the estimation of the time domain channel of the LOS portion, the time domain channel estimation of the part NLOS, the power spectral migration of the part NLOS and maximum Doppler extension, time domain correlation function is obtained；Channel estimation is carried out using the time domain correlation function.Channel estimating performance can be improved in the present invention.

Description

A kind of relativity of time domain estimation method, device and equipment
Technical field
The present invention relates to field of communication technology more particularly to a kind of relativity of time domain estimation methods, device and equipment.
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.
The high-speed rail model under single RRH and the high-speed rail model under 4RRH are given in the prior art.Under normal circumstances, false If the power spectrum of Rayleigh fading is Jake ' s spectrum.In actual conditions, the UE (User Equipment, user equipment) under high-speed rail is also Will receive the stronger non-direct projection diameter in part influences, i.e. LOS (Line of Sight, direct projection diameter) diameter+NLOS (Non Line of Sight, non-direct projection diameter) diameter.And under normal circumstances, NLOS diameter is Rayleigh fading.
Existing relativity of time domain estimation method is directed to Rayleigh fading model or the high-speed rail model there is only LOS diameter.And Under the high-speed rail scene of LOS diameter+NLOS diameter, the time domain correlation function being calculated according to existing method can all have error, from And channel estimating performance is caused to decline.
Summary of the invention
In view of this, the present invention provides a kind of relativity of time domain estimation method, device and equipment, estimate to improve channel Count performance.
In order to solve the above technical problems, in a first aspect, the embodiment of the present invention provides a kind of relativity of time domain estimation method, Include:
The time domain of the time domain channel estimation and the non-part direct projection diameter NLOS of pilot frequency locations direct projection diameter LOS portion is obtained respectively Channel estimation；
Obtain the power spectral migration and maximum Doppler extension of the part NLOS；
According to the estimation of the time domain channel of the LOS portion, the time domain channel estimation of the part NLOS, the portion NLOS The power spectral migration divided and maximum Doppler extension, obtain time domain correlation function；
Channel estimation is carried out using the time domain correlation function.
Wherein, the time domain channel estimation for obtaining pilot frequency locations direct projection diameter LOS portion respectively and the non-portion direct projection diameter NLOS The time domain channel estimation divided, comprising:
For any diameter, according to the estimating Doppler frequency deviation on the diameter, on the basis of the 0th symbol, to the pilot tone The time domain channel estimated value of position does phase derotation；
Within a predetermined period of time, add up to the time domain channel estimated value after phase derotation, obtain it is cumulative and；
According to time domain channel estimation that is described cumulative and obtaining the LOS portion；
Estimate that the time domain channel for obtaining the part NLOS is estimated according to cumulative and the LOS portion the time domain channel Meter.
Wherein, the power spectral migration for obtaining the part NLOS and maximum Doppler extension, comprising:
Sequence correlation estimation is done to the time domain channel estimation of the part NLOS, the sequence correlation for obtaining the part NLOS is estimated Evaluation；
According to the sequence correlation estimation value of the part NLOS, the power spectral migration and maximum of the part NLOS are determined Doppler spread.
Wherein, the method also includes:
According to maximum Doppler extension and carrier frequency, the movement speed of user equipment (UE) is obtained.
Wherein, described according to the estimation of the time domain channel of the LOS portion, the time domain channel estimation of the part NLOS, institute The power spectral migration and maximum Doppler extension for stating the part NLOS, obtain time domain correlation function, comprising:
According to the estimating Doppler frequency deviation of the time domain channel of LOS portion estimation and the LOS portion, described in acquisition The time domain correlation function of LOS portion；
According to the estimation of the time domain channel of the part NLOS, the power spectral migration of the part NLOS and maximum Doppler Extension, obtains the time domain correlation function of the part NLOS；
Estimated according to the time domain channel of the LOS portion, determines the LOS power ratio and NLOS power ratio on all diameters；
According to the LOS power ratio on the time domain correlation function of the LOS portion, all diameters, the part NLOS Time domain correlation function, the NLOS power ratio, obtain final time domain correlation function.
Second aspect, the embodiment of the present invention provide a kind of relativity of time domain estimation device, comprising:
First obtains module, and the time domain channel for obtaining pilot frequency locations direct projection diameter LOS portion respectively estimates and non-direct projection The time domain channel of the part diameter NLOS is estimated；
Second obtains module, for obtaining the power spectral migration and maximum Doppler extension of the part NLOS；
Third obtains module, for being believed according to the time domain of the estimation of the time domain channel of the LOS portion, the part NLOS Road estimation, the power spectral migration of the part NLOS and maximum Doppler extension, obtain time domain correlation function；
Channel estimation module, for carrying out channel estimation using the time domain correlation function.
Wherein, the first acquisition module includes:
Phase is untwisted rotor module, for for any diameter, according to the estimating Doppler frequency deviation on the diameter, with the 0th On the basis of symbol, phase derotation is done to the time domain channel estimated value of the pilot frequency locations；
Cumulative submodule, within a predetermined period of time, being carried out to the time domain channel estimated value after phase derotation tired Add, obtain it is cumulative and；
First acquisition submodule, for being estimated according to time domain channel that is described cumulative and obtaining the LOS portion；
Second acquisition submodule, for being estimated according to cumulative and the LOS portion the time domain channel, described in acquisition The time domain channel of the part NLOS is estimated.
Wherein, the second acquisition module includes:
Acquisition submodule does sequence correlation estimation for the time domain channel estimation to the part NLOS, obtains the portion NLOS The sequence correlation estimation value divided；
It determines submodule, for the sequence correlation estimation value according to the part NLOS, determines the function of the part NLOS Rate spectral migration and maximum Doppler extension.
Wherein, described device further include:
Speed determination module, for obtaining the shifting of user equipment (UE) according to maximum Doppler extension and carrier frequency Dynamic speed.
Wherein, institute's third acquisition module includes:
First acquisition submodule, for the estimation according to the time domain channel of LOS portion estimation and the LOS portion Doppler shift obtains the time domain correlation function of the LOS portion；
Second acquisition submodule, for the power according to the estimation of the time domain channel of the part NLOS, the part NLOS Spectral migration and maximum Doppler extension, obtain the time domain correlation function of the part NLOS；
First determines submodule, for estimating according to the time domain channel of the LOS portion, determines the LOS function on all diameters Rate ratio and NLOS power ratio；
Third acquisition submodule, for according to the LOS function on the time domain correlation function of the LOS portion, all diameters Rate than, the time domain correlation function of the part NLOS, the NLOS power ratio, obtain final time domain correlation function.
The third aspect, the embodiment of the present invention provide a kind of relativity of time domain estimation equipment, comprising: memory, processor and It is stored in the computer program that can be run on the memory and on the processor；The processor, for reading storage Program in device executes following process:
The time domain of the time domain channel estimation and the non-part direct projection diameter NLOS of pilot frequency locations direct projection diameter LOS portion is obtained respectively Channel estimation；
Obtain the power spectral migration and maximum Doppler extension of the part NLOS；
According to the estimation of the time domain channel of the LOS portion, the time domain channel estimation of the part NLOS, the portion NLOS The power spectral migration divided and maximum Doppler extension, obtain time domain correlation function；
Channel estimation is carried out using the time domain correlation function.
Wherein, the processor is also used to read the program in memory, executes following process:
For any diameter, according to the estimating Doppler frequency deviation on the diameter, on the basis of the 0th symbol, to the pilot tone The time domain channel estimated value of position does phase derotation；
Within a predetermined period of time, add up to the time domain channel estimated value after phase derotation, obtain it is cumulative and；
According to time domain channel estimation that is described cumulative and obtaining the LOS portion；
Estimate that the time domain channel for obtaining the part NLOS is estimated according to cumulative and the LOS portion the time domain channel Meter.
Wherein, the processor is also used to read the program in memory, executes following process:
Sequence correlation estimation is done to the time domain channel estimation of the part NLOS, the sequence correlation for obtaining the part NLOS is estimated Evaluation；
According to the sequence correlation estimation value of the part NLOS, the power spectral migration and maximum of the part NLOS are determined Doppler spread.
Wherein, the processor is also used to read the program in memory, executes following process:
According to maximum Doppler extension and carrier frequency, the movement speed of user equipment (UE) is obtained.
Wherein, the processor is also used to read the program in memory, executes following process:
According to the estimating Doppler frequency deviation of the time domain channel of LOS portion estimation and the LOS portion, described in acquisition The time domain correlation function of LOS portion；
According to the estimation of the time domain channel of the part NLOS, the power spectral migration of the part NLOS and maximum Doppler Extension, obtains the time domain correlation function of the part NLOS；
Estimated according to the time domain channel of the LOS portion, determines the LOS power ratio and NLOS power ratio on all diameters；
According to the LOS power ratio on the time domain correlation function of the LOS portion, all diameters, the part NLOS Time domain correlation function, the NLOS power ratio, obtain final time domain correlation function.
Fourth 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.
The advantageous effects of the above technical solutions of the present invention are as follows:
In embodiments of the present invention, the time domain that can accurately estimate in high-speed rail LOS diameter+NLOS diameter is related Therefore function, utilizes the embodiment of the present invention so as to optimize channel estimation results using accurate relativity of time domain Scheme improves channel estimating performance.
Detailed description of the invention
Fig. 1 (a) and Fig. 1 (b) is respectively the power spectrum of list RRH and more RRH；
Fig. 2 is Jake ' s power spectrum；
Fig. 3 (a) and Fig. 3 (b) is respectively the power spectrum of list RRH and more RRH under LOS diameter+NLOS diameter；
Fig. 4 is the flow chart of the relativity of time domain estimation method of the embodiment of the present invention；
Fig. 5 is LTE CRS pattern schematic diagram；
Fig. 6 is the flow processing schematic diagram of the embodiment of the present invention；
Fig. 7 is the NLOS power spectrum after offset；
Fig. 8 is handling capacity comparison schematic diagram of the scheme of existing scheme and the embodiment of the present invention under LOS diameter；
Fig. 9 is handling capacity comparison schematic diagram of the scheme of existing scheme and the embodiment of the present invention under LOS+NLOS diameter；
Figure 10 is the schematic diagram of the relativity of time domain estimation device of the embodiment of the present invention；
Figure 11 is the structure chart of the relativity of time domain estimation device of the embodiment of the present invention；
Figure 12 is that the relativity of time domain of the embodiment of the present invention estimates the schematic diagram of equipment.
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.
36.101 Appendix B .3 of 3GPP gives the high-speed rail model under single RRH；36.101 Appendix B .3A of 3GPP gives 4 High-speed rail model under RRH.But in these models, all assume that the signal from each RRH only has direct projection diameter (LOS), without There are non-direct projection diameter (NLOS), power spectrum such as Fig. 1 (a) and Fig. 1 (b) are shown.Fig. 1 (a) is power spectrum under list RRU, Fig. 1 (b) For power spectrum under more RRU.
Under normal circumstances, it is assumed that the power spectrum of Rayleigh fading is Jake ' s spectrum, as shown in Figure 2.In actual conditions, high-speed rail Under mobile device (UE) also will receive the stronger non-direct projection diameter in part and influence, i.e. LOS diameter+NLOS diameter.And under normal circumstances, NLOS diameter is Rayleigh fading, so, power spectrum such as Fig. 3 (a) and Fig. 3 (b) are shown.
In the prior art, by wiener-khintchine's theorem, the power spectral density of wide stationary random process is its auto-correlation function Fourier transform, then time domain correlation function can be obtained by the inverse fourier transform of power spectrum.
Under non-high-speed rail, general power spectrum meets classics Jake ' s spectrum, and corresponding time domain correlation function is first kind zeroth order shellfish plug That function, i.e.,
Under the more RRH high-speed rail models of 3GPP, byTime domain correlation function is calculated, wherein ΔfpIndicate the frequency deviation on pth diameter, P (Δ fp) indicate frequency deviation Δ f on pth diameterpProbability.
However, when the power spectrum under practical high-speed rail is as shown in Fig. 3 (a) and Fig. 3 (b), since existing relativity of time domain is estimated Meter method is directed to Rayleigh fading model or the high-speed rail model there is only LOS diameter, and in the high-speed rail scene of LOS diameter+NLOS diameter Under, therefore the time domain correlation function that existing method is calculated is obviously no longer suitable.When the time domain correlation function of mistake will lead to The channel estimation value for the mistake that domain interpolation obtains causes performance loss to influence channel estimating performance.
For this purpose, as shown in figure 4, the relativity of time domain estimation method of the embodiment of the present invention, comprising:
The time domain channel of step 401, the time domain channel estimation for obtaining pilot frequency locations LOS portion respectively and the part NLOS is estimated Meter.
In this step, for any diameter, according to the estimating Doppler frequency deviation on the diameter, using the 0th symbol as base Standard does phase derotation to the time domain channel estimated value of the pilot frequency locations, within a predetermined period of time, after phase derotation Time domain channel estimated value add up, obtain it is cumulative and.Then, according to time domain that is described cumulative and obtaining the LOS portion Channel estimation is estimated according to cumulative and the LOS portion the time domain channel, obtains the time domain channel of the part NLOS Estimation.
Assuming that under single RRH, shown in power spectrum such as Fig. 3 (a)；Under multiple RRH, shown in power spectrum such as Fig. 3 (b).It is multiple RRH power spectrum, which can be regarded as, to be formed by stacking by multiple list RRH power spectrum.
By taking LTE (Long Term Evolution, long term evolution) as an example, pilot frequency locations are discrete in time domain, such as Fig. 5 It is shown.
Assuming that multiple RRH signals be estimate a plurality of diameter, it is known that on first of symbol, pth diameter pilot frequency locations when Domain channel estimation value is expressed asThe estimating Doppler frequency deviation Δ f of pth diameterp。
In this embodiment, it needs according in pilot frequency locationsAnd relativity of time domain interpolation obtains non-pilot position On channel estimation value.In addition, using relativity of time domain, it can also be in pilot frequency locationsTime-domain filtering is carried out, thus Inhibit noise etc. pairInfluence, promoted pilot frequency locations upper signal channel estimated value quality.
Flow processing schematic diagram as shown in connection with fig. 6, it is assumed that the time domain letter of pilot frequency locations on first of symbol, pth diameter Road estimated value
Wherein,It indicates the time domain channel estimation of LOS component part, and is remained unchanged in a period of time；It indicates The time domain channel of NLOS component part is estimated；It indicates due to Doppler shift Δ fpCaused phase rotation；ΔtlIt indicates The time interval of first of symbol and the 0th symbol.
So, according to estimating Doppler frequency deviation Δ fp, on the basis of the 0th symbol, after doing phase derotation, can obtain It arrives:
Under general high-speed rail, since movement velocity is very fast, causeIt changes over time comparatively fast, so, it is assumed that In a period of timeIt is cumulative and smaller；AndIt remains unchanged whithin a period of time.So, meet:
SoUtilizeEstimation obtains LOS component part Then, then byEstimation obtains NLOS component part
Step 402, the power spectral migration for obtaining the part NLOS and maximum Doppler extension.
In this step, doppler spread estimation and power spectrum bias estimation are carried out.Specifically, to the part NLOS Time domain channel estimation do sequence correlation estimation, the sequence correlation estimation value of the part NLOS is obtained, according to the part NLOS Sequence correlation estimation value determines the power spectral migration and maximum Doppler extension of the part NLOS.
Under general Rayleigh fading, it is assumed that automatic frequency tracking ((Automatic Frequency Control, AFC)) Error very little, then power spectrum is as shown in Fig. 2, power spectrum is centrosymmetric about f=0Hz, so, time domain correlation function are as follows:
But, it is assumed that in the case of more RRH, by the combined influence of a plurality of LOS diameter Doppler frequency shift, automatic frequency tracking (AFC) it is no longer centrosymmetric about f=0Hz for may making the corresponding power spectrum in the part NLOS after, but about some frequency Rate f0It is centrosymmetric, as shown in Figure 7.
So, time domain correlation function becomes:
Assuming that the time domain channel of NLOS component part is estimated as on known pilot positionIt then can be by right It does sequence correlation estimation and obtains the sequence correlation estimation value of the part NLOS
Due to J0(2πfd,maxIt τ) is real number, soPhase i.e. correspond toSo as to estimate power Spectral migration f0。
Due toSoSo as to utilizeIt estimates most Doppler spreads fd,max。
Further, here, may also be combined with carrier frequency, the related movement speed of UE is estimated, i.e.,Its Middle fcIndicate carrier frequency, c indicates the light velocity.
It, then can be in addition, it is assumed that the part NLOS from each RRH all meets the distribution of identical Jake ' s spectral power spectrum The estimation of a plurality of diameter is merged.
Step 403 is estimated, institute according to the time domain channel of the estimation of the time domain channel of the LOS portion, the part NLOS The power spectral migration and maximum Doppler extension for stating the part NLOS, obtain time domain correlation function.
In this step, it may include following process:
Step 4031, according to the time domain channel of the LOS portion estimation and the LOS portion estimating Doppler frequency deviation, Obtain the time domain correlation function of the LOS portion；
Step 4032, according to the estimation of the time domain channel of the part NLOS, the power spectral migration of the part NLOS and most Doppler spreads obtain the time domain correlation function of the part NLOS；
Step 4033 is estimated according to the time domain channel of the LOS portion, determines LOS power ratio and the NLOS on all diameters Power ratio；
Step 4034, according to the LOS power ratio, described on the time domain correlation function of the LOS portion, all diameters The time domain correlation function of the part NLOS, the NLOS power ratio, obtain final time domain correlation function.
Assuming that the time domain channel of LOS component part is estimated in pilot frequency locations on known pth diameterCorresponding Doppler Frequency displacement Δ fp；The time domain channel of NLOS component part is estimatedCorresponding power spectral migration f0, maximum Doppler extension fd,max。
So, the time domain correlation function of LOS portion is expressed as:
Wherein
The time domain correlation function of the part NLOS is expressed as:
Meanwhile LOS power ratio on all diameters and NLOS power ratio are respectively as follows:
So final time domain correlation function is expressed as: Rt(τ)=PLOS·Rt,LOS(τ)+PNLOS·Rt,NLOS(τ)。
Step 404 carries out channel estimation using the time domain correlation function.
In embodiments of the present invention, the time domain that can accurately estimate in high-speed rail LOS diameter+NLOS diameter is related Therefore function, utilizes the embodiment of the present invention so as to optimize channel estimation results using accurate relativity of time domain Scheme improves channel estimating performance.
The above method is not limited only to LTE, and the time domain correlation function applied also under all high-speed rails calculates.
By taking the 4RRH model of 36.101 Appendix B .3A of LTE 3GPP as an example, there is only in the case where LOS diameter, due to NLOS Part estimation PNLOS≈ 0, so, throughput performance maintains an equal level with original, as shown in Figure 8.
And when the 4RRH model based on 36.101 Appendix B .3A of 3GPP, 8 NLOS diameters are further added by, in total the phase of 9 diameters It is as shown in table 1 to time delay and relative power.Throughput performance promotes about 2.5dB, as shown in Figure 9.
Table 1
Relative time delay [ns] Relative power [dB]
0 0.0(LOS)
9 -9.02(NLOS)
18 -9.02(NLOS)
36 -15.73(NLOS)
71 -19.43(NLOS)
179 -20.13(NLOS)
286 -21.33(NLOS)
393 -23.63(NLOS)
500 -25.03(NLOS)
As shown in Figure 10, the relativity of time domain estimation device of the embodiment of the present invention, comprising:
First obtain module 1001, for obtain respectively pilot frequency locations direct projection diameter LOS portion time domain channel estimate and it is non- The time domain channel of the part direct projection diameter NLOS is estimated；
Second obtains module 1002, for obtaining the power spectral migration and maximum Doppler extension of the part NLOS；
Third obtain module 1003, for according to the time domain channel of the LOS portion estimation, the part NLOS when Domain channel estimation, the power spectral migration of the part NLOS and maximum Doppler extension, obtain time domain correlation function；
Channel estimation module 1004, for carrying out channel estimation using the time domain correlation function.
Wherein, the first acquisition module 1001 includes:
Phase is untwisted rotor module, for for any diameter, according to the estimating Doppler frequency deviation on the diameter, with the 0th On the basis of symbol, phase derotation is done to the time domain channel estimated value of the pilot frequency locations；Cumulative submodule, for predetermined In period, add up to the time domain channel estimated value after phase derotation, obtain it is cumulative and；First acquisition submodule is used Estimate according to time domain channel that is described cumulative and obtaining the LOS portion；Second acquisition submodule, for according to described tired The time domain channel estimation for summing it up the LOS portion obtains the time domain channel estimation of the part NLOS.
Wherein, the second acquisition module 1002 includes:
Acquisition submodule does sequence correlation estimation for the time domain channel estimation to the part NLOS, obtains the portion NLOS The sequence correlation estimation value divided；Determine submodule, for the sequence correlation estimation value according to the part NLOS, determine described in The power spectral migration of the part NLOS and maximum Doppler extension.
As shown in figure 11, described device further include:
Speed determination module 1005, for obtaining user equipment (UE) according to maximum Doppler extension and carrier frequency Movement speed.
Wherein, it includes: the first acquisition submodule that institute's third, which obtains module 1003, for the time domain according to the part LOS The estimating Doppler frequency deviation of channel estimation and the LOS portion, obtains the time domain correlation function of the LOS portion；Second obtains Submodule, for according to the time domain channel of the part NLOS estimation, the power spectral migration of the part NLOS and most mostly it is general Extension is strangled, the time domain correlation function of the part NLOS is obtained；First determine submodule, for according to the LOS portion when Domain channel estimation determines LOS power ratio and NLOS power ratio on all diameters；Third acquisition submodule, for according to The time domain correlation function of LOS portion, the LOS power ratio on all diameters, the time domain correlation function of the part NLOS, institute NLOS power ratio is stated, final time domain correlation function is obtained.
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 time domain that can accurately estimate in high-speed rail LOS diameter+NLOS diameter is related Therefore function, utilizes the embodiment of the present invention so as to optimize channel estimation results using accurate relativity of time domain Scheme improves channel estimating performance.
As shown in figure 12, the relativity of time domain of the embodiment of the present invention estimates equipment, comprising:
Processor 1200 executes following process for reading the program in memory 1220:
The time domain of the time domain channel estimation and the non-part direct projection diameter NLOS of pilot frequency locations direct projection diameter LOS portion is obtained respectively Channel estimation；
Obtain the power spectral migration and maximum Doppler extension of the part NLOS；
According to the estimation of the time domain channel of the LOS portion, the time domain channel estimation of the part NLOS, the portion NLOS The power spectral migration divided and maximum Doppler extension, obtain time domain correlation function；
Channel estimation is carried out using the time domain correlation function；
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:
For any diameter, according to the estimating Doppler frequency deviation on the diameter, on the basis of the 0th symbol, to the pilot tone The time domain channel estimated value of position does phase derotation；
Within a predetermined period of time, add up to the time domain channel estimated value after phase derotation, obtain it is cumulative and；
According to time domain channel estimation that is described cumulative and obtaining the LOS portion；
Estimate that the time domain channel for obtaining the part NLOS is estimated according to cumulative and the LOS portion the time domain channel Meter.
Processor 1200 is also used to read the computer program, executes following steps:
Sequence correlation estimation is done to the time domain channel estimation of the part NLOS, the sequence correlation for obtaining the part NLOS is estimated Evaluation；
According to the sequence correlation estimation value of the part NLOS, the power spectral migration and maximum of the part NLOS are determined Doppler spread.
Processor 1200 is also used to read the computer program, executes following steps:
According to maximum Doppler extension and carrier frequency, the movement speed of user equipment (UE) is obtained.
Processor 1200 is also used to read the computer program, executes following steps:
According to the estimating Doppler frequency deviation of the time domain channel of LOS portion estimation and the LOS portion, described in acquisition The time domain correlation function of LOS portion；
According to the estimation of the time domain channel of the part NLOS, the power spectral migration of the part NLOS and maximum Doppler Extension, obtains the time domain correlation function of the part NLOS；
Estimated according to the time domain channel of the LOS portion, determines the LOS power ratio and NLOS power ratio on all diameters；
According to the LOS power ratio on the time domain correlation function of the LOS portion, all diameters, the part NLOS Time domain correlation function, the NLOS power ratio, obtain final time domain correlation function.
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 of the time domain channel estimation and the non-part direct projection diameter NLOS of pilot frequency locations direct projection diameter LOS portion is obtained respectively Channel estimation；
Obtain the power spectral migration and maximum Doppler extension of the part NLOS；
According to the estimation of the time domain channel of the LOS portion, the time domain channel estimation of the part NLOS, the portion NLOS The power spectral migration divided and maximum Doppler extension, obtain time domain correlation function；
Channel estimation is carried out using the time domain correlation function.
Wherein, the time domain channel estimation for obtaining pilot frequency locations direct projection diameter LOS portion respectively and the non-portion direct projection diameter NLOS The time domain channel estimation divided, comprising:
For any diameter, according to the estimating Doppler frequency deviation on the diameter, on the basis of the 0th symbol, to the pilot tone The time domain channel estimated value of position does phase derotation；
Within a predetermined period of time, add up to the time domain channel estimated value after phase derotation, obtain it is cumulative and；
According to time domain channel estimation that is described cumulative and obtaining the LOS portion；
Estimate that the time domain channel for obtaining the part NLOS is estimated according to cumulative and the LOS portion the time domain channel Meter.
Wherein, the power spectral migration for obtaining the part NLOS and maximum Doppler extension, comprising:
Sequence correlation estimation is done to the time domain channel estimation of the part NLOS, the sequence correlation for obtaining the part NLOS is estimated Evaluation；
According to the sequence correlation estimation value of the part NLOS, the power spectral migration and maximum of the part NLOS are determined Doppler spread.
Wherein, the method also includes:
According to maximum Doppler extension and carrier frequency, the movement speed of user equipment (UE) is obtained.
Wherein, described according to the estimation of the time domain channel of the LOS portion, the time domain channel estimation of the part NLOS, institute The power spectral migration and maximum Doppler extension for stating the part NLOS, obtain time domain correlation function, comprising:
According to the estimating Doppler frequency deviation of the time domain channel of LOS portion estimation and the LOS portion, described in acquisition The time domain correlation function of LOS portion；
According to the estimation of the time domain channel of the part NLOS, the power spectral migration of the part NLOS and maximum Doppler Extension, obtains the time domain correlation function of the part NLOS；
Estimated according to the time domain channel of the LOS portion, determines the LOS power ratio and NLOS power ratio on all diameters；
According to the LOS power ratio on the time domain correlation function of the LOS portion, all diameters, the part NLOS Time domain correlation function, the NLOS power ratio, obtain final time domain correlation function.
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 (16)

1. a kind of relativity of time domain estimation method characterized by comprising
The time domain channel of the time domain channel estimation and the non-part direct projection diameter NLOS that obtain pilot frequency locations direct projection diameter LOS portion respectively is estimated Meter；
Obtain the power spectral migration and maximum Doppler extension of the part NLOS；
Estimated according to the time domain channel of the estimation of the time domain channel of the LOS portion, the part NLOS, the function of the part NLOS Rate spectral migration and maximum Doppler extension, obtain time domain correlation function；
Channel estimation is carried out using the time domain correlation function.
2. the method according to claim 1, wherein described obtain pilot frequency locations direct projection diameter LOS portion respectively The time domain channel of time domain channel estimation and the non-part direct projection diameter NLOS is estimated, comprising:
For any diameter, according to the estimating Doppler frequency deviation on the diameter, on the basis of the 0th symbol, to the pilot frequency locations Time domain channel estimated value do phase derotation；
Within a predetermined period of time, add up to the time domain channel estimated value after phase derotation, obtain it is cumulative and；
According to time domain channel estimation that is described cumulative and obtaining the LOS portion；
Estimated according to cumulative and the LOS portion the time domain channel, obtains the time domain channel estimation of the part NLOS.
3. the method according to claim 1, wherein the power spectral migration for obtaining the part NLOS and most Doppler spreads, comprising:
Sequence correlation estimation is done to the time domain channel estimation of the part NLOS, obtains the sequence correlation estimation value of the part NLOS；
According to the sequence correlation estimation value of the part NLOS, power spectral migration and the maximum Doppler of the part NLOS are determined Extension.
4. method according to claim 1 or 3, which is characterized in that the method also includes:
According to maximum Doppler extension and carrier frequency, the movement speed of user equipment (UE) is obtained.
5. the method according to claim 1, wherein described according to the estimation of the time domain channel of the LOS portion, institute The time domain channel estimation, the power spectral migration of the part NLOS and maximum Doppler extension for stating the part NLOS, obtain time domain phase Close function, comprising:
According to the estimating Doppler frequency deviation of the time domain channel of LOS portion estimation and the LOS portion, the portion LOS is obtained The time domain correlation function divided；
It is extended according to the estimation of the time domain channel of the part NLOS, the power spectral migration of the part NLOS and maximum Doppler, Obtain the time domain correlation function of the part NLOS；
Estimated according to the time domain channel of the LOS portion, determines the LOS power ratio and NLOS power ratio on all diameters；
According to the time domain of LOS power ratio, the part NLOS on the time domain correlation function of the LOS portion, all diameters Correlation function, the NLOS power ratio, obtain final time domain correlation function.
6. a kind of relativity of time domain estimation device characterized by comprising
First obtains module, and the time domain channel for obtaining pilot frequency locations direct projection diameter LOS portion respectively estimates and non-direct projection diameter The time domain channel of the part NLOS is estimated；
Second obtains module, for obtaining the power spectral migration and maximum Doppler extension of the part NLOS；
Third obtains module, for being estimated according to the time domain channel of the estimation of the time domain channel of the LOS portion, the part NLOS Meter, the power spectral migration of the part NLOS and maximum Doppler extension, obtain time domain correlation function；
Channel estimation module, for carrying out channel estimation using the time domain correlation function.
7. device according to claim 6, which is characterized in that described first, which obtains module, includes:
Phase is untwisted rotor module, for for any diameter, according to the estimating Doppler frequency deviation on the diameter, with the 0th symbol On the basis of, phase derotation is done to the time domain channel estimated value of the pilot frequency locations；
Cumulative submodule is obtained within a predetermined period of time, adding up to the time domain channel estimated value after phase derotation It is cumulative and；
First acquisition submodule, for being estimated according to time domain channel that is described cumulative and obtaining the LOS portion；
Second acquisition submodule obtains the portion NLOS for estimating according to cumulative and the LOS portion the time domain channel The time domain channel estimation divided.
8. device according to claim 6, which is characterized in that described second, which obtains module, includes:
Acquisition submodule does sequence correlation estimation for the time domain channel estimation to the part NLOS, obtains the part NLOS Sequence correlation estimation value；
It determines submodule, for the sequence correlation estimation value according to the part NLOS, determines the power spectrum of the part NLOS Offset and maximum Doppler extension.
9. the device according to claim 6 or 8, which is characterized in that described device further include:
Speed determination module, for obtaining the mobile speed of user equipment (UE) according to maximum Doppler extension and carrier frequency Degree.
10. device according to claim 6, which is characterized in that institute's third obtains module and includes:
First acquisition submodule, for the estimating Doppler according to the time domain channel of LOS portion estimation and the LOS portion Frequency deviation obtains the time domain correlation function of the LOS portion；
Second acquisition submodule, for inclined according to the estimation of the time domain channel of the part NLOS, the power spectrum of the part NLOS It moves and maximum Doppler extends, obtain the time domain correlation function of the part NLOS；
First determines submodule, for estimating according to the time domain channel of the LOS portion, determines the LOS power ratio on all diameters With NLOS power ratio；
Third acquisition submodule, for according on the time domain correlation function of the LOS portion, all diameters LOS power ratio, The time domain correlation function of the part NLOS, the NLOS power ratio, obtain final time domain correlation function.
11. a kind of relativity of time domain estimates equipment, comprising: 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:
The time domain channel of the time domain channel estimation and the non-part direct projection diameter NLOS that obtain pilot frequency locations direct projection diameter LOS portion respectively is estimated Meter；
Obtain the power spectral migration and maximum Doppler extension of the part NLOS；
Estimated according to the time domain channel of the estimation of the time domain channel of the LOS portion, the part NLOS, the function of the part NLOS Rate spectral migration and maximum Doppler extension, obtain time domain correlation function；
Channel estimation is carried out using the time domain correlation function.
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:
For any diameter, according to the estimating Doppler frequency deviation on the diameter, on the basis of the 0th symbol, to the pilot frequency locations Time domain channel estimated value do phase derotation；
Within a predetermined period of time, add up to the time domain channel estimated value after phase derotation, obtain it is cumulative and；
According to time domain channel estimation that is described cumulative and obtaining the LOS portion；
Estimated according to cumulative and the LOS portion the time domain channel, obtains the time domain channel estimation of the part NLOS.
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:
Sequence correlation estimation is done to the time domain channel estimation of the part NLOS, obtains the sequence correlation estimation value of the part NLOS；
According to the sequence correlation estimation value of the part NLOS, power spectral migration and the maximum Doppler of the part NLOS are determined Extension.
14. equipment according to claim 11 or 13, which is characterized in that the processor is also used to read in memory Program executes following process:
According to maximum Doppler extension and carrier frequency, the movement speed of user equipment (UE) is obtained.
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:
According to the estimating Doppler frequency deviation of the time domain channel of LOS portion estimation and the LOS portion, the portion LOS is obtained The time domain correlation function divided；
It is extended according to the estimation of the time domain channel of the part NLOS, the power spectral migration of the part NLOS and maximum Doppler, Obtain the time domain correlation function of the part NLOS；
Estimated according to the time domain channel of the LOS portion, determines the LOS power ratio and NLOS power ratio on all diameters；
According to the time domain of LOS power ratio, the part NLOS on the time domain correlation function of the LOS portion, all diameters Correlation function, the NLOS power ratio, obtain final time domain correlation function.
16. a kind of computer readable storage medium, for storing computer program, which is characterized in that the computer program quilt The step in the method as described in any one of claims 1 to 5 is realized when processor executes.
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