CN104426817B - A kind of channel estimation methods and its device - Google Patents

A kind of channel estimation methods and its device Download PDF

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Publication number
CN104426817B
CN104426817B CN201310360610.8A CN201310360610A CN104426817B CN 104426817 B CN104426817 B CN 104426817B CN 201310360610 A CN201310360610 A CN 201310360610A CN 104426817 B CN104426817 B CN 104426817B
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channel estimation
signal
domain filtering
multipath
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CN201310360610.8A
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CN104426817A (en
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徐兵
王乃博
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联芯科技有限公司
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Abstract

The present invention relates to the communications field, discloses a kind of channel estimation methods and its device, can carry out channel estimation using different decision methods according to different scenes, improve the performance of channel estimation.The channel estimation methods include:Decision parameter is measured using the first channel estimation value, first channel estimation value carries out channel estimation according to the data of reference signal position and obtained, and the decision parameter is used for the correlated characteristic for characterizing channel;Decision method when channel estimation is carried out to non-reference signal position is obtained according to the decision parameter;Channel estimation is carried out to the data of the non-reference signal position according to the decision method, second channel estimate is obtained, using the second channel estimate as final channel estimation value.The channel estimation methods are used for channel estimation in communication system.

Description

A kind of channel estimation methods and its device

Technical field

The present invention relates to the communications field, more particularly to a kind of channel estimation methods and its device.

Background technology

The channel circumstance change of radio communication is complicated, and the quality of channel directly affects the communication matter of wireless communication system Amount, therefore channel estimation is the premise that wireless communication system provides higher data rate, and only channel is accurately believed Estimate that receiver can just be accurately finished reception in road.

At present, each communication system uses a number of training sequence known to insertion in the data frame of emitter transmitting Or data receive for receiving terminal, the training sequence or data can regard reference signal as, so as to what is received according to receiving terminal Training sequence or data carry out the channel estimation methods of channel estimation.LTE (Long Term Evolution, Long Term Evolution)It is logical Letter system is with MIMO(Multiple Input Multiple Output, multiple-input, multiple-output)With OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexi) based on physical layer framework.In LTE communication In the channel estimation of system, the given data for channel estimation that LTE system is sent is discrete to be distributed in time domain and frequency domain Reference signal(RS, Reference Signal), terminal can first estimate the letters of these reference signal positions when receiving data Road is estimated, the channel estimation of other positions then can be obtained according to interpolation, the interpolation is non-reference signal.As shown in figure 1, Fig. 1 is the reference signal distribution map in two time slots at antenna port on a subcarrier, and the R0 in figure is represented with reference to letter Number, the signal on remaining position is non-reference signal.The method for calculating the channel estimation of the reference signal position is LS (Least Square, least square), the method for calculating the channel estimation of non-reference signal position is MMSE(Minimum Mean Square Error, least mean-square error)Filtering.The MMSE filtering methods are that the channel of the reference signal position obtained with LS is estimated Basis is calculated as, it is determined that carrying out the decision method of channel estimation value to the channel of non-reference signal position, is obtained according to the decision method To the channel estimation value of non-reference signal position.The decision method includes:When determining that non-reference signal position carries out channel estimation Perform the order of frequency domain filtering and time-domain filtering, frequency domain filtering based on distribution of multipath time delay subcarrier between cross-correlation mould Correlation models and exponent number between type and exponent number, the symbol based on Doppler power spectra.

Filtering is segmented into the filtering in the filtering on frequency domain direction and time domain direction.As shown in figure 1, f instructions in figure Direction represents frequency domain direction, and the direction of t instructions represents time domain direction.The exponent number of wave filter is bigger, filters the obtained property of signal Can be higher, but computation complexity can also increase simultaneously.In addition, the estimation of frequency domain and relativity of time domain can be carried out in filtering, should Correlation can be used for the correlation between the approximate multiple subcarriers for judging reality and between OFDM symbol.In practice, The estimation of correlation is carried out using frequency-filtering model and time-domain filtering model.Conventional frequency-filtering model has uniform time delay Model, exponential decay model and linear attenuation model.Conventional time-domain filtering model has Jakes Power Spectrum Models and linear interpolation Model.

In the prior art, simple in order to what is designed and calculate, the execution sequence of frequency domain filtering and time-domain filtering is certain , in addition, cross-correlation model and exponent number between the subcarrier of the frequency domain filtering based on distribution of multipath time delay, based on Doppler's work( What correlation models and exponent number between the symbol of rate spectrum were also all to determine, still, such design can not be under various scenes Reach the optimization of channel estimating performance.

The content of the invention

, can be according to different scenes using not it is an object of the invention to provide a kind of channel estimation methods and its device Same decision method carries out channel estimation, improves the performance of channel estimation.

In order to solve the above technical problems, embodiments of the present invention provide a kind of channel estimation methods, including:

Decision parameter is measured using the first channel estimation value, first channel estimation value carries out channel according to reference signal Estimation obtains, and the decision parameter is used for the correlated characteristic for characterizing channel;

Decision method when channel estimation is carried out to non-reference signal position is obtained according to the decision parameter;

Channel estimation is carried out to the non-reference signal according to the decision method, second channel estimate is obtained, by institute Second channel estimate is stated as final channel estimation value.

Embodiments of the present invention additionally provide a kind of channel estimating apparatus, including:

Measuring unit, for using the first channel estimation value measurement decision parameter, first channel estimation value to be according to ginseng The data progress channel estimation for examining signal location obtains, and the decision parameter is used for the correlated characteristic for characterizing channel;

Acquiring unit, for obtaining judgement when channel estimation is carried out to non-reference signal position according to the decision parameter Method;

Processing unit, for carrying out channel estimation to the data of the non-reference signal position according to the decision method, Second channel estimate is obtained, using the second channel estimate as final channel estimation value;

Embodiment of the present invention carries out channel estimation in terms of existing technologies, in the data to non-reference signal position When, decision parameter is measured first with the first channel estimation value, first channel estimation value is according to the number of reference signal position Obtained according to channel estimation is carried out;Sentence when then obtaining according to the decision parameter and carry out channel estimation to non-reference signal position Certainly method;Channel estimation is carried out to the data of the non-reference signal position then according to the decision method, obtains the second letter Road estimate, using the second channel estimate as final channel estimation value.With in the prior art, it is simple for design Between the subcarrier of certain, based on distribution of multipath time delay the frequency domain filtering of frequency domain filtering and the execution sequence of time-domain filtering used Cross-correlation model and exponent number, the symbol based on Doppler power spectra between correlation models and exponent number determine channel estimation Method compares, and can carry out channel estimation using different methods according to different scenes, improve the performance of channel estimation.

In addition, the decision method obtained according to the decision parameter when channel estimation is carried out to non-reference signal position Including:By the moving velocity of terminal compared with default first threshold value;Preset when the moving velocity of terminal is more than The first thresholding when, it is described to non-reference signal position carry out channel estimation when advanced row frequency domain filtering carry out time-domain filtering again; It is described that channel estimation is carried out to non-reference signal position when the moving velocity of terminal is less than or equal to default first thresholding When first carry out time-domain filtering and carry out frequency domain filtering again.

, can be higher and relatively low in moving velocity of terminal by flexible configuration time-domain filtering, the sequencing of frequency domain filtering Scene under obtain preferably performance relatively, it is more excellent than the channel estimation methods performance of fixed filter sequence.

In addition, the decision method obtained according to the decision parameter when channel estimation is carried out to non-reference signal position Also include:The maximum multipath is delayed and the business of multipath mean-square value is compared with default second threshold value;When it is described most It is described that channel is carried out to non-reference signal position when the business of big multipath delay and multipath mean-square value is more than default second threshold value Cross-correlation model during estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay is exponential decay model;When described It is described to non-reference signal position when maximum multipath is delayed and the business of multipath mean-square value is less than or equal to default second threshold value It is uniformly delay mould to carry out cross-correlation model during channel estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay Type or linear attenuation model;Or

The maximum multipath is delayed and the business of multipath mean-square value is compared with default 3rd threshold value;When it is described most It is described that channel is carried out to non-reference signal position when the business of big multipath delay and multipath mean-square value is more than default three threshold value Cross-correlation model during estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay is linear attenuation model;When described It is described to non-reference signal position when maximum multipath is delayed and the business of multipath mean-square value is less than or equal to default three threshold value It is uniformly delay mould to carry out cross-correlation model during channel estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay Type.

By self-adaptation flexible set frequency domain filter exponent number, can in the case where ensureing performance, selection of time compared with Complexity is reduced in the case of big.

In addition, the decision method obtained according to the decision parameter when channel estimation is carried out to non-reference signal position Also include:The exponent number of the frequency domain filtering is determined according to the maximum multipath time delay, the maximum multipath time delay is bigger, the frequency Domain filter order is smaller, and the maximum multipath time delay is smaller, and the frequency domain filter exponent number is bigger.

By self-adaptation flexible set frequency domain filter exponent number, can in the case where ensureing performance, frequency select compared with Complexity is reduced in the case of big.

In addition, the decision method obtained according to the decision parameter when channel estimation is carried out to non-reference signal position Also include:By the moving velocity of terminal compared with default 4th threshold value;When the moving velocity of terminal is more than in advance If four threshold values when, it is described to non-reference signal position carry out channel estimation when time-domain filtering based on Doppler power spectra Symbol between correlation models be Jakes Power Spectrum Models;When the moving velocity of terminal is more than default 4th thresholding It is described non-reference signal position to be carried out during channel estimation between the symbol based on Doppler power spectra of time-domain filtering during value Correlation models are linear interpolation model.

By the way that adaptively a kind of immediate time-domain filtering model can be selected according to the scene of reality, so as to provide performance Preferably channel estimation methods.

In addition, the decision method obtained according to the decision parameter when channel estimation is carried out to non-reference signal position Also include:The exponent number of the time-domain filtering is determined according to the moving velocity of terminal, the moving velocity of terminal is bigger, when described Domain filter order is smaller, and the moving velocity of terminal is smaller, and the time-domain filtering exponent number is bigger.

By the way that adaptively a kind of immediate time-domain filtering model can be selected according to the scene of reality, so as to provide performance Preferably channel estimation methods.

Brief description of the drawings

Fig. 1 is the reference signal distribution map in two time slots at antenna port on a subcarrier in the prior art;

Fig. 2 is the channel estimation methods schematic flow sheet of first embodiment of the invention;

Fig. 3 is the channel estimating apparatus structural representation of seventh embodiment of the invention;

Fig. 4 is the acquiring unit structural representation of seventh embodiment of the invention;

Fig. 5 is the acquiring unit structural representation of eighth embodiment of the invention;

Fig. 6 is the acquiring unit structural representation of ninth embodiment of the invention;

Fig. 7 is the acquiring unit structural representation of tenth embodiment of the invention;

Fig. 8 is the acquiring unit structural representation of eleventh embodiment of the invention.

Embodiment

To make the object, technical solutions and advantages of the present invention clearer, each reality below in conjunction with accompanying drawing to the present invention The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the present invention, In order that reader more fully understands the application and proposes many ins and outs.But even if without these ins and outs and base Many variations and modification in following embodiment, each claim of the application technical side claimed can also be realized Case.

First embodiment of the invention provides a kind of channel estimation methods, as shown in Fig. 2 the channel estimation methods include:

S101, according to the data of reference signal position carry out channel estimation, obtain the first channel estimation value.

First channel estimation value is vector or matrix.This step is same as the prior art, will not be repeated here.

S102, utilize the first channel estimation value measurement decision parameter.

Decision parameter is used for the correlated characteristic for characterizing channel, specifically includes one below or its any combination:Maximum multipath Time delay, multipath mean-square value and moving velocity of terminal.

Method using the first channel estimation value measurement decision parameter is prior art, and therefore not to repeat here by the present invention.

S103, according to the decision parameter obtain to non-reference signal position carry out channel estimation when decision method.

Decision method when carrying out channel estimation to non-reference signal position includes:Non-reference signal position channel estimation is held During row, the sequencing of frequency domain filtering and time-domain filtering, frequency domain filtering based on distribution of multipath time delay subcarrier between it is mutual Correlation models and exponent number between correlation model and exponent number, the symbol based on Doppler power spectra.

Included according to the decision method that the decision parameter is obtained when carrying out channel estimation to non-reference signal position:

Obtained moving velocity of terminal will be measured in step s 102, compared with default first threshold value;Work as institute When stating moving velocity of terminal and being more than default first thresholding, advanced line frequency domain is filtered when channel estimation is carried out to non-reference signal position Ripple carries out time-domain filtering again;When the moving velocity of terminal is less than or equal to default first thresholding, to non-reference signal position Time-domain filtering, which is first carried out, when putting progress channel estimation carries out frequency domain filtering again.

Terminal movement speed the frequency domain characteristic and time domain specification of signal can be had an impact, when moving velocity of terminal compared with When fast, Doppler frequency shift diffusion can be produced on the frequency domain of signal, so as to cause time selective fading of the signal in time domain. Therefore, when moving velocity of terminal is larger, first carry out frequency domain filtering and carry out time-domain filtering again.

In actual applications, default first thresholding can take 30km(Km)/h(Hour)Value between~100km/h, Specific value size can be adjusted according to the needs of practical application.

Example, it is assumed that the moving velocity of terminal that step S102 measurements obtain is 90km/h, and default first thresholding is 60km/h, because moving velocity of terminal is that 90km/h more than default first thresholding is 60km/h, then step S103 can be adjudicated Advanced row frequency domain filtering carries out time-domain filtering again when obtaining carrying out channel estimation to non-reference signal position in the scene channel.

In the step S103 of the embodiment of the present invention, only obtained according to decision parameter and non-reference signal position progress channel is estimated The sequencing for performing Time-Frequency Domain Filtering and time-domain filtering of timing, the subcarrier of the frequency domain filtering based on distribution of multipath time delay it Between cross-correlation model and exponent number, the symbol based on Doppler power spectra between correlation models and exponent number still according to existing Method in technology determines.

S104, the data progress channel estimation according to the decision method to the non-reference signal position, obtain second Channel estimation value, using the second channel estimate as final channel estimation value.

Specifically, in this step, letter is carried out to non-reference signal position according to what judgement in step s 103 obtained When road is estimated, perform the sequencing of Time-Frequency Domain Filtering and time-domain filtering, and determine in the prior art based on multidiameter delay The correlation between cross-correlation model and exponent number, the symbol based on Doppler power spectra between the subcarrier of the frequency domain filtering of distribution Property model and exponent number, channel estimation is carried out to the data of the non-reference signal position.

Embodiment of the present invention carries out channel estimation in terms of existing technologies, in the data to non-reference signal position When, decision parameter is measured first with the first channel estimation value, the first channel estimation value enters according to the data of reference signal position Row channel estimation obtains;Then judgement side when channel estimation is carried out to non-reference signal position is obtained according to the decision parameter Method;Channel estimation is carried out to the data of the non-reference signal position then according to the decision method, second channel is obtained and estimates Evaluation, using the second channel estimate as final channel estimation value.With in the prior art, for the simple use of design Frequency domain filtering and time-domain filtering certain, based on distribution of multipath time delay the frequency domain filtering of execution sequence subcarrier between it is mutual The channel estimation methods that correlation models and exponent number between correlation model and exponent number, the symbol based on Doppler power spectra determine Compare, the speed that can be moved according to terminal in different scenes carries out sentencing for the execution sequence of frequency domain filtering and time-domain filtering Disconnected, being filtered in channel estimation according to corresponding filter sequence corresponding to moving velocity of terminal can obtain filtering than fixed Order preferably performance, improve the performance of channel estimation.

Second embodiment of the invention provides a kind of channel estimation methods, and second embodiment is basic with first embodiment Identical, difference part is:In the first embodiment, it is comparison according to moving velocity of terminal and default first threshold value As a result, decision-making is that advanced row frequency domain filtering carries out time-domain filtering again in the channel estimation of non-reference signal position, or advanced Row time-domain filtering carries out frequency domain filtering again.And in the present embodiment, the sequencing of frequency domain filtering and time-domain filtering still can be with Determined by prior art, but need business and default second threshold value or the 3rd according to maximum multipath delay and multipath mean-square value The comparison of threshold value, the son load of the frequency domain filtering based on distribution of multipath time delay in the channel estimation of decision-making non-reference signal position Cross-correlation model between ripple.

Specifically, during step S103 is performed, obtained according to decision parameter and non-reference signal position is carried out Decision method during channel estimation includes:The maximum multipath is delayed and the business of multipath mean-square value and default second threshold value It is compared;It is described to non-ginseng when the business of maximum multipath delay and multipath mean-square value is more than default second threshold value Examining cross-correlation model when signal location carries out channel estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay is Exponential decay model;When the business of maximum multipath delay and multipath mean-square value is less than or equal to default second threshold value, It is mutual between the subcarrier of the frequency domain filtering based on distribution of multipath time delay during the progress channel estimation to non-reference signal position Correlation model is uniform delay model or linear attenuation model.In the step S103 of the embodiment of the present invention, only according to the judgement Gain of parameter is carried out during channel estimation to non-reference signal position between the subcarrier of the frequency domain filtering based on distribution of multipath time delay Cross-correlation model, perform the sequencing of Time-Frequency Domain Filtering and time-domain filtering, the exponent number of frequency domain filtering, based on Doppler power Correlation models and exponent number between the symbol of spectrum determine still according to method of the prior art.

Multipath delay is the signal in the difference path when receiving caused by signal is propagated in the channel along different paths The time difference of receiving terminal is reached, maximum multipath delay is represented between the component of signal reached earliest and the component of signal reached at the latest Time difference, multipath mean-square value represent root mean square time delay.

At present, totally three kinds of the cross-correlation model between the subcarrier of the frequency domain filtering based on distribution of multipath time delay:Index declines Subtract model, uniform delay model and linear attenuation model.Above-mentioned three kinds of models cut both ways, and exponential decay model calculates more multiple It is miscellaneous, but closer actual channel scenario;Uniform delay model calculates channel scenario that is simple, but can not approaching reality substantially; The calculating complexity and performance of linear attenuation model are between above two model.

In actual applications, default second threshold value can take the value between 2~20, and specific value size can basis The needs of practical application are adjusted.

Example, it is assumed that the business of the delay of maximum multipath that step S102 measurements obtain and multipath mean-square value is 6, default the Two threshold values 8, because the business of maximum multipath delay and multipath mean-square value is less than default second threshold value, therefore non-reference is believed It is uniform that number position, which carries out the cross-correlation model between the subcarrier of the frequency domain filtering based on distribution of multipath time delay during channel estimation, Delay model or linear attenuation model.

Or present embodiment can obtain the subcarrier of the frequency domain filtering based on distribution of multipath time delay in the following way Between cross-correlation model:

The maximum multipath is delayed and the business of multipath mean-square value is compared with default 3rd threshold value;When it is described most It is described that channel is carried out to non-reference signal position when the business of big multipath delay and multipath mean-square value is more than default three threshold value Cross-correlation model during estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay is linear attenuation model;When described It is described to non-reference signal position when maximum multipath is delayed and the business of multipath mean-square value is less than or equal to default three threshold value It is uniformly delay mould to carry out cross-correlation model during channel estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay Type.

In actual applications, default 3rd thresholding can take the value between 1~5, and specific value size can be according to reality The needs of border application are adjusted.

Example, it is assumed that the business of the delay of maximum multipath that step S102 measurements obtain and multipath mean-square value is 6, default the Three threshold values 4, because the business of maximum multipath delay and multipath mean-square value is more than default 3rd threshold value, therefore non-reference is believed It is linear that number position, which carries out the cross-correlation model between the subcarrier of the frequency domain filtering based on distribution of multipath time delay during channel estimation, Attenuation model.

Or present embodiment can obtain the subcarrier of the frequency domain filtering based on distribution of multipath time delay in the following way Between cross-correlation model:

The maximum multipath is delayed and the business of multipath mean-square value and default second threshold value and default 3rd thresholding Value is compared simultaneously;When the business of maximum multipath delay and multipath mean-square value is less than default second threshold value, to non- Reference signal position carries out the cross-correlation model between the subcarrier of the frequency domain filtering based on distribution of multipath time delay during channel estimation For uniform delay model;When the business of maximum multipath delay and multipath mean-square value is more than or equal to default second threshold value and same When being less than default three threshold value, based on distribution of multipath time delay when carrying out channel estimation to non-reference signal position Cross-correlation model between the subcarrier of frequency domain filtering is linear attenuation model;When maximum multipath delay and multipath mean-square value Business when being more than or equal to default three threshold value, be based on distribution of multipath time delay when carrying out channel estimation to non-reference signal position Frequency domain filtering subcarrier between cross-correlation model be exponential decay model.

It should be noted that the premise that the present embodiment is set up, which is default second threshold value, is less than described default the Three threshold values.

Example, it is assumed that the maximum multipath delay and the business of multipath mean-square value that step S102 measurements obtain are 3, described Default second threshold value 2, default 3rd threshold value 5, due to maximum multipath delay and the business of multipath mean-square value Meet more than default second threshold value and be less than default 3rd threshold value simultaneously, therefore, it is determined that obtaining to non-ginseng Examining cross-correlation model when signal location carries out channel estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay is Linear attenuation model.

So, immediate frequency-filtering model can be selected according to different scenes, improves channel estimation Performance.

Third embodiment of the invention provides a kind of channel estimation methods, and the 3rd embodiment and first embodiment are basic Identical, difference part is:In the first embodiment, it is comparison according to moving velocity of terminal and default first threshold value As a result, decision-making is that advanced row frequency domain filtering carries out time-domain filtering again in the channel estimation of non-reference signal position, or advanced Row time-domain filtering carries out frequency domain filtering again.And in the present embodiment, the sequencing of frequency domain filtering and time-domain filtering still can be with Determined by prior art, but need to be filtered come the frequency domain in the channel estimation of decision-making non-reference signal position according to maximum multipath delay The exponent number of ripple.

During step S103 is performed, obtained according to the decision parameter and non-reference signal position progress channel is estimated The decision method of timing also includes:The exponent number of the frequency domain filtering, the maximum multipath are determined according to the maximum multipath time delay Time delay is bigger, and the frequency domain filter exponent number is smaller, and the maximum multipath time delay is smaller, and the frequency domain filter exponent number is bigger. In the step S103 of the embodiment of the present invention, when only being obtained according to the decision parameter to non-reference signal position progress channel estimation The exponent number of frequency domain filtering, perform sequencing, the frequency domain filtering based on distribution of multipath time delay of Time-Frequency Domain Filtering and time-domain filtering Subcarrier between cross-correlation model, the correlation models between the symbol based on Doppler power spectra and exponent number still according to Method of the prior art determines.

In actual applications, the span of maximum multipath time delay is 0us(Microsecond)~20us, frequency domain filter exponent number Span is 2~24.Example, the corresponding relation of value may be referred between maximum multipath time delay and frequency domain filter exponent number Table 1.

Table 1

Example, it is assumed that the value for the maximum multipath time delay that step S102 measurements obtain is 12us, and tabling look-up 1 can obtain, the channel It is 5~9 to carry out advanced line frequency domain filter order during channel estimation in scene to non-reference signal position, i.e., to non-in the scene It is any one value in 5,6,7,8 and 9 that reference signal position, which carries out advanced line frequency domain filter order during channel estimation,.

Corresponding relation between maximum multipath time delay and the frequency domain filter exponent number can enter according to the needs of practical application Row is set, and this is not restricted by the present invention.

So, frequency domain filtering exponent number can be carried out according to different scenes on the premise of filtering performance is ensured Selection, the complexity of wave filter design is reduced in the case that frequency domain is selectively larger and time domain selectivity is big.

Four embodiment of the invention provides a kind of channel estimation methods, and the 4th embodiment and first embodiment are basic Identical, difference part is:In the first embodiment, it is comparison according to moving velocity of terminal and default first threshold value As a result, decision-making is that advanced row frequency domain filtering carries out time-domain filtering again in the channel estimation of non-reference signal position, or advanced Row time-domain filtering carries out frequency domain filtering again.And in the present embodiment, the sequencing of frequency domain filtering and time-domain filtering still can be with Determined by prior art, but need compared with default 4th threshold value, to carry out decision-making according to by the moving velocity of terminal Correlation models between the symbol based on Doppler power spectra of time-domain filtering.

During step S103 is performed, obtained according to the decision parameter and non-reference signal position progress channel is estimated The decision method of timing includes:By the moving velocity of terminal compared with default 4th threshold value;When the terminal is moved When dynamic speed is more than default four threshold value, during the progress channel estimation to non-reference signal position time-domain filtering based on Correlation models between the symbol of Doppler power spectra are Jakes Power Spectrum Models;When the moving velocity of terminal is less than in advance If four threshold values when, to non-reference signal position carry out channel estimation when time-domain filtering the symbol based on Doppler power spectra Correlation between number is linear interpolation model.In the step S103 of the embodiment of the present invention, only obtained according to the decision parameter The correlation models between the symbol based on Doppler power spectra during channel estimation are carried out to non-reference signal position, perform time-frequency Domain filters and the sequencing of time-domain filtering, frequency domain filtering based on distribution of multipath time delay subcarrier between cross-correlation model And the exponent number of exponent number, time-domain filtering determines still according to method of the prior art.

At present, totally two kinds of the correlation between the symbol based on Doppler power spectra of time-domain filtering:Jakes power spectrum moulds Type and linear interpolation model.Jakes Power Spectrum Model accuracys are higher, but the complexity designed is of a relatively high, linear interpolation The model Jakes Power Spectrum Models accuracy is relatively low, but the complexity designed is relatively low.

In actual applications, default 4th threshold value can take the value between 30km/h~150km/h, and specific value is big It is small to be adjusted according to the needs of practical application.

Example, it is assumed that the moving velocity of terminal that step S102 measurements obtain is 90km/h, and default 4th threshold value is 100km/h, because moving velocity of terminal is that 90km/h is less than default 4th threshold value 100km/h, then it can adjudicate this The correlation between the symbol based on Doppler power spectra during channel estimation is carried out described in channel scenario to non-reference signal position Property model is linear interpolation model.

So, immediate time-domain filtering model can be selected according to different scenes, improves channel estimation Performance.

Fifth embodiment of the invention provides a kind of channel estimation methods, and the 5th embodiment and first embodiment are basic Identical, difference part is:In the first embodiment, it is comparison according to moving velocity of terminal and default first threshold value As a result, decision-making is that advanced row frequency domain filtering carries out time-domain filtering again in the channel estimation of non-reference signal position, or advanced Row time-domain filtering carries out frequency domain filtering again.And in the present embodiment, the sequencing of frequency domain filtering and time-domain filtering still can be with Determined by prior art, but need to determine the exponent number of the time-domain filtering according to the moving velocity of terminal.

During step S103 is performed, obtained according to the decision parameter and non-reference signal position progress channel is estimated The decision method of timing includes:The exponent number of the time-domain filtering is determined according to the moving velocity of terminal, moving velocity of terminal is got over Greatly, time-domain filtering exponent number is smaller, and moving velocity of terminal is smaller, and time-domain filtering exponent number is bigger.The step S103 of the embodiment of the present invention In, the exponent number of time-domain filtering when channel estimation is carried out to non-reference signal position is only obtained according to the decision parameter, it is described to hold The sequencing of row Time-Frequency Domain Filtering and time-domain filtering, the frequency domain filtering based on distribution of multipath time delay subcarrier between Correlation models between cross-correlation model and exponent number, the symbol based on Doppler power spectra are still according in the prior art Method determine.

In actual applications, the scope of moving velocity of terminal is 0km/h~500km/h, the scope of the exponent number of time-domain filtering For 2~6.In the method for the time-domain filtering is determined according to the moving velocity of terminal, multiple thresholdings can be set first, so Carried out afterwards according to the segmentation of the multiple thresholding with the exponent number of the time-domain filtering corresponding.Example, move speed for the terminal Degree, default first cervical orifice of uterus are limited to 50km/h, and default second cervical orifice of uterus is limited to 100km/h.Then the terminal movement speed Degree and the default first cervical orifice of uterus limit and the size of the default second cervical orifice of uterus limit.When the moving velocity of terminal is less than institute State default first cervical orifice of uterus to prescribe a time limit, it is 5 or 6 that can set the time-domain filtering exponent number;When the moving velocity of terminal be more than etc. Prescribe a time limit simultaneously in the default first cervical orifice of uterus limit and less than default second cervical orifice of uterus, the time-domain filtering rank can be set Number is 3 or 4;When the moving velocity of terminal is prescribed a time limit more than or equal to default second cervical orifice of uterus, the time domain can be set to filter Ripple exponent number is 2.Corresponding relation between the moving velocity of terminal and the time domain filtering exponent number can be according to practical application Need to be configured, this is not restricted by the present invention.

So, time-domain filtering exponent number can be carried out according to different scenes on the premise of filtering performance is ensured Selection, the complexity of wave filter design is reduced in the case that frequency domain is selectively larger and time domain selectivity is big.

Sixth embodiment of the invention provides a kind of channel estimation methods, and the 5th embodiment and first embodiment are basic Identical, difference part is:During step S103 is performed, the according to embodiments of the present invention one, embodiment of the present invention two, this Embodiment described in inventive embodiments three, the embodiment of the present invention four and the embodiment of the present invention five is obtained to non-reference signal position Put the sequencing, the frequency based on distribution of multipath time delay that perform Time-Frequency Domain Filtering and time-domain filtering when carrying out channel estimation Domain filtering subcarrier between cross-correlation model and exponent number, the symbol based on Doppler power spectra between correlation models and One or more of exponent number, for not according to the embodiment in the embodiment of the present invention one to embodiment five come the judgement that obtains Method, it can be determined according to method of the prior art.

So, the flexibility of channel estimation methods can be increased, while also carry on the premise of filtering performance is ensured The high accuracy of channel estimation methods.

Seventh embodiment of the invention provides a kind of channel estimating apparatus 3, as shown in figure 3, the channel estimating apparatus 3 wraps Include:

Measuring unit 30, for using the first channel estimation value measurement decision parameter, first channel estimation value according to The data of reference signal position carry out channel estimation and obtained, and decision parameter is used for the correlated characteristic for characterizing channel.

Acquiring unit 31, for being obtained according to the decision parameter to sentencing during the progress channel estimation of non-reference signal position Certainly method.

Decision parameter specifically includes one below or its any combination:Maximum multipath time delay, multipath mean-square value and terminal are moved Dynamic speed.

Processing unit 32, estimate for carrying out channel to the data of the non-reference signal position according to the decision method Meter, obtains second channel estimate, using the second channel estimate as final channel estimation value.

Further, as shown in figure 4, the acquiring unit 31 includes following subelement:

First comparing subunit 3101, for by the moving velocity of terminal compared with default first threshold value.

First judges subelement 3102, for when the moving velocity of terminal is more than default first thresholding, judging institute State advanced row frequency domain filtering when carrying out channel estimation to non-reference signal position and carry out time-domain filtering again.

Second judges subelement 3103, for when the moving velocity of terminal is less than or equal to default first thresholding, Judge that first carry out time-domain filtering during the progress channel estimation to non-reference signal position carries out frequency domain filtering again.

Embodiment of the present invention carries out channel estimation in terms of existing technologies, in the data to non-reference signal position When, measuring unit is using the first channel estimation value measurement decision parameter first, and first channel estimation value is according to reference signal The data of position carry out channel estimation and obtained;Then acquiring unit obtains to enter non-reference signal position according to the decision parameter Decision method during row channel estimation;Then data of the processing unit according to the decision method to the non-reference signal position Channel estimation is carried out, second channel estimate is obtained, using the second channel estimate as final channel estimation value.With showing Have in technology, in order to which the execution sequence of the simple frequency domain filtering used and time-domain filtering of design is certain, is divided based on multidiameter delay The correlation between cross-correlation model and exponent number, the symbol based on Doppler power spectra between the subcarrier of the frequency domain filtering of cloth The channel estimating apparatus that model and exponent number determine is compared, and the speed that be able to can be moved according to terminal in different scenes is carried out The judgement of the execution sequence of frequency domain filtering and time-domain filtering, in channel estimation according to being filtered accordingly corresponding to moving velocity of terminal Ripple order is filtered the performance that can obtain than fixed filter sequence preferably performance, improving channel estimation.

Eighth embodiment of the invention provides another channel estimating apparatus, and the 8th embodiment and the 7th embodiment are big Cause it is identical, as shown in figure 5, the main distinction in place of be:The acquiring unit is described based on distribution of multipath time delay for obtaining Cross-correlation model between the subcarrier of frequency domain filtering.

The acquiring unit 31 also includes following subelement:

Second comparing subunit 3104, for the maximum multipath to be delayed and the business of multipath mean-square value and default second Threshold value is compared.

3rd judges subelement 3105, for being more than default the as the business of maximum multipath delay and multipath mean-square value During two threshold values, the frequency domain filtering based on distribution of multipath time delay during the progress channel estimation to non-reference signal position is judged Cross-correlation model between subcarrier is exponential decay model.

4th judges subelement 3106, for being less than or equal in advance as the business of maximum multipath delay and multipath mean-square value If the second threshold value when, judge it is described to non-reference signal position carry out channel estimation when the frequency domain based on distribution of multipath time delay Cross-correlation model between the subcarrier of filtering is uniform delay model or linear attenuation model.

Or

Second comparing subunit 3104, for by the maximum multipath be delayed and the business of multipath mean-square value with it is default 3rd threshold value is compared.

3rd judges subelement 3105, for being more than default the as the business of maximum multipath delay and multipath mean-square value During three threshold values, the frequency domain filtering based on distribution of multipath time delay during the progress channel estimation to non-reference signal position is judged Cross-correlation model between subcarrier is linear attenuation model.

4th judges subelement 3106, for being less than or equal in advance as the business of maximum multipath delay and multipath mean-square value If three threshold values when, judge it is described to non-reference signal position carry out channel estimation when the frequency domain based on distribution of multipath time delay Cross-correlation model between the subcarrier of filtering is uniform delay model.

So, the acquiring unit can select immediate frequency-filtering model according to different scenes, improve The performance of channel estimation.

Ninth embodiment of the invention provides another channel estimating apparatus, and the 9th embodiment and the 7th embodiment are big Cause it is identical, as shown in fig. 6, the main distinction in place of be:The acquiring unit is used for the exponent number for obtaining the frequency domain filtering.

The acquiring unit 31 also includes following subelement:

First determination subelement 3107, for determining the exponent number of the frequency domain filtering, institute according to the maximum multipath time delay It is bigger to state maximum multipath time delay, the frequency domain filter exponent number is smaller, and the maximum multipath time delay is smaller, the frequency domain filter Exponent number is bigger.

So, the acquiring unit can enter line frequency on the premise of filtering performance is ensured according to different scenes The selection of domain filter order, the complexity of wave filter design is reduced in the case that frequency domain is selectively larger and time domain selectivity is big Degree.

Tenth embodiment of the invention provides another channel estimating apparatus, and the tenth embodiment and the 7th embodiment are big Cause it is identical, as shown in fig. 7, the main distinction in place of be:The acquiring unit is described based on Doppler power spectra for obtaining Correlation models between symbol.

The acquiring unit 31 also includes following subelement:

3rd comparing subunit 3108, for by the moving velocity of terminal compared with default 4th threshold value;

5th judges subelement 3109, for when the moving velocity of terminal is more than default four threshold value, judging The correlation carried out to non-reference signal position during channel estimation between the symbol based on Doppler power spectra of time-domain filtering Property model is Jakes Power Spectrum Models;

6th judges subelement 3110, for when the moving velocity of terminal is more than default four threshold value, judging The correlation models carried out to non-reference signal position during channel estimation between the symbol based on Doppler power spectra are line Property interpolation model.

So, the acquiring unit can select immediate time-domain filtering model according to different scenes, improve The performance of channel estimation.

Eleventh embodiment of the invention provides another channel estimating apparatus, the 11st embodiment and the 7th embodiment party Formula is roughly the same, as shown in figure 8, being in place of the main distinction:The acquiring unit is used for the exponent number for obtaining the time-domain filtering.

The acquiring unit 31 also includes following subelement:

Second determination subelement 3111, for determining the exponent number of the time-domain filtering, institute according to the moving velocity of terminal It is bigger to state moving velocity of terminal, the time-domain filtering exponent number is smaller, and the moving velocity of terminal is smaller, the time-domain filtering exponent number It is bigger.

So, the acquiring unit can be on the premise of filtering performance be ensured, when being carried out according to different scenes The selection of domain filter order, the complexity of wave filter design is reduced in the case that frequency domain is selectively larger and time domain selectivity is big Degree.

It is noted that each module involved in present embodiment is logic module, and in actual applications, one Individual logic unit can be a part for a physical location or a physical location, can also be with multiple physics lists The combination of member is realized.The operation principle of each physical location may be referred to the narration in embodiment of the method, and the present invention is herein no longer Repeat.In addition, in order to protrude the innovative part of the present invention, do not have with solving skill proposed by the invention in present embodiment The less close unit of art issue concerns introduces, but this is not intended that in present embodiment and other units are not present.

It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific embodiment of the present invention, And in actual applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.

Claims (10)

  1. A kind of 1. channel estimation methods, it is characterised in that including:
    Decision parameter is measured using the first channel estimation value, first channel estimation value enters according to the data of reference signal position Row channel estimation obtains, and the decision parameter is used for the correlated characteristic for characterizing channel;
    Decision method when channel estimation is carried out to non-reference signal position is obtained according to the decision parameter;
    Channel estimation is carried out to the data of the non-reference signal position according to the decision method, obtains second channel estimation Value, using the second channel estimate as final channel estimation value;
    The decision parameter includes:Maximum multipath time delay, multipath mean-square value;
    The decision method obtained according to the decision parameter when carrying out channel estimation to non-reference signal position specifically includes:
    By the business of the maximum multipath time delay and multipath mean-square value compared with default second threshold value;
    It is described to non-reference signal when the business of the maximum multipath time delay and multipath mean-square value is more than default second threshold value Cross-correlation model when position carries out channel estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay declines for index Subtract model;
    It is described to non-ginseng when the business of the maximum multipath time delay and multipath mean-square value is less than or equal to default second threshold value Examining cross-correlation model when signal location carries out channel estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay is Uniform delay model or linear attenuation model;Or
    By the business of the maximum multipath time delay and multipath mean-square value compared with default 3rd threshold value;
    It is described to non-reference signal when the business of the maximum multipath time delay and multipath mean-square value is more than default three threshold value Cross-correlation model when position carries out channel estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay is linearly to decline Subtract model;
    It is described to non-ginseng when the business of the maximum multipath time delay and multipath mean-square value is less than or equal to default three threshold value Examining cross-correlation model when signal location carries out channel estimation between the subcarrier of the frequency domain filtering based on distribution of multipath time delay is Uniform delay model.
  2. 2. channel estimation methods according to claim 1, it is characterised in that the decision parameter also includes:Terminal moves Speed;
    The decision method obtained according to the decision parameter when carrying out channel estimation to non-reference signal position also includes:
    By the moving velocity of terminal compared with default first threshold value;
    When the moving velocity of terminal is more than default first thresholding, in the channel estimation of the non-reference signal position first Carry out frequency domain filtering and carry out time-domain filtering again;
    When the moving velocity of terminal is less than or equal to default first thresholding, the channel in the non-reference signal position is estimated Time-domain filtering is first carried out in meter and carries out frequency domain filtering again.
  3. 3. channel estimation methods according to claim 1, it is characterised in that described to be obtained according to the decision parameter to non- Decision method when reference signal position carries out channel estimation also includes:
    The exponent number of the frequency domain filtering is determined according to the maximum multipath time delay, the maximum multipath time delay is bigger, frequency domain filtering Device exponent number is smaller, and the maximum multipath time delay is smaller, and the frequency domain filter exponent number is bigger.
  4. 4. channel estimation methods according to claim 2, it is characterised in that described to be obtained according to the decision parameter to non- Decision method when reference signal position carries out channel estimation also includes:
    By the moving velocity of terminal compared with default 4th threshold value;
    It is described that channel estimation is carried out to non-reference signal position when the moving velocity of terminal is more than default four threshold value When time-domain filtering the symbol based on Doppler power spectra between correlation models be Jakes Power Spectrum Models;
    It is described that non-reference signal position is carried out when the moving velocity of terminal is less than or equal to default four threshold value Correlation models during channel estimation between the symbol based on Doppler power spectra of time-domain filtering are linear interpolation model.
  5. 5. channel estimation methods according to claim 2, it is characterised in that described to be obtained according to the decision parameter to non- Decision method when reference signal position carries out channel estimation also includes:
    The exponent number of the time-domain filtering is determined according to the moving velocity of terminal, the moving velocity of terminal is bigger, the time domain Filter order is smaller, and the moving velocity of terminal is smaller, and the time-domain filtering exponent number is bigger.
  6. A kind of 6. channel estimating apparatus, it is characterised in that including:
    Measuring unit, for using the first channel estimation value measurement decision parameter, first channel estimation value to be according to reference to letter The data of number position carry out channel estimation and obtained, and the decision parameter is used for the correlated characteristic for characterizing channel;
    Acquiring unit, for obtaining judgement side when channel estimation is carried out to non-reference signal position according to the decision parameter Method;
    Processing unit, for carrying out channel estimation to the data of the non-reference signal position according to the decision method, obtain Second channel estimate, using the second channel estimate as final channel estimation value;
    The decision parameter includes:Maximum multipath time delay, multipath mean-square value;
    The acquiring unit includes following subelement:
    Second comparing subunit, for the business of the maximum multipath time delay and multipath mean-square value and default second threshold value to be entered Row compares;
    3rd judges subelement, for being more than default second threshold value as the business of the maximum multipath time delay and multipath mean-square value When, judge it is described to non-reference signal position carry out channel estimation when the frequency domain filtering based on distribution of multipath time delay subcarrier it Between cross-correlation model be exponential decay model;
    4th judges subelement, for being less than or equal to default second as the business of the maximum multipath time delay and multipath mean-square value During threshold value, the son that the frequency domain filtering based on distribution of multipath time delay during channel estimation is carried out to non-reference signal position is judged Cross-correlation model between carrier wave is uniform delay model or linear attenuation model;Or
    Second comparing subunit, for the business of the maximum multipath time delay and multipath mean-square value and default 3rd threshold value to be entered Row compares;
    3rd judges subelement, for being more than default 3rd threshold value as the business of the maximum multipath time delay and multipath mean-square value When, judge it is described to non-reference signal position carry out channel estimation when the frequency domain filtering based on distribution of multipath time delay subcarrier it Between cross-correlation model be linear attenuation model;
    4th judges subelement, for being less than or equal to the default 3rd as the business of the maximum multipath time delay and multipath mean-square value During threshold value, the son that the frequency domain filtering based on distribution of multipath time delay during channel estimation is carried out to non-reference signal position is judged Cross-correlation model between carrier wave is uniform delay model.
  7. 7. channel estimating apparatus according to claim 6, it is characterised in that the decision parameter also includes:Terminal moves Speed;
    The acquiring unit also includes following subelement:
    First comparing subunit, for by the moving velocity of terminal compared with default first threshold value;
    First judges subelement, for when the moving velocity of terminal is more than default first thresholding, judging the non-reference Advanced row frequency domain filtering carries out time-domain filtering again in the channel estimation of signal location;
    Second judges subelement, for when the moving velocity of terminal is less than or equal to default first thresholding, described in judgement Time-domain filtering is first carried out in the channel estimation of non-reference signal position and carries out frequency domain filtering again.
  8. 8. channel estimating apparatus according to claim 6, it is characterised in that it is single that the acquiring unit also includes following son Member:
    First determination subelement, it is described most most for determining the exponent number of the frequency domain filtering according to the maximum multipath time delay Footpath time delay is bigger, and frequency domain filter exponent number is smaller, and the maximum multipath time delay is smaller, and the frequency domain filter exponent number is bigger.
  9. 9. channel estimating apparatus according to claim 7, it is characterised in that it is single that the acquiring unit also includes following son Member:
    3rd comparing subunit, for by the moving velocity of terminal compared with default 4th threshold value;
    5th judges subelement, for when the moving velocity of terminal is more than default four threshold value, judging described to non- Reference signal position carry out channel estimation when time-domain filtering the symbol based on Doppler power spectra between correlation models be Jakes Power Spectrum Models;
    6th judges subelement, for when the moving velocity of terminal is less than or equal to default four threshold value, judging The correlation carried out to non-reference signal position during channel estimation between the symbol based on Doppler power spectra of time-domain filtering Property is linear interpolation model.
  10. 10. channel estimating apparatus according to claim 7, it is characterised in that it is single that the acquiring unit also includes following son Member:
    Second determination subelement, for determining the exponent number of the time-domain filtering according to the moving velocity of terminal, the terminal is moved Dynamic speed is bigger, and the time-domain filtering exponent number is smaller, and the moving velocity of terminal is smaller, and the time-domain filtering exponent number is bigger.
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