CN103368874A - An apparatus, a method, and a user device for channel estimation - Google Patents

Abstract

The embodiment of the invention provides an apparatus, a method, and a user device for channel estimation. The apparatus for channel estimation comprises a preprocessing unit, an interference eliminating unit, and a channel estimating unit. Using a reference signal sequence generated in advance, the preprocessing unit performs demultiplexing and despreading processing on a received signal in order to extract superimposed initial channel response of a resource element occupied by the reference signal in a downlink transport layer. The interference eliminating unit performs interference elimination according to an interference eliminating matrix used for eliminating interlayer interference and the initial channel response information, and acquires channel response information of the resource element occupied by the reference signal which has suffered from interference elimination. Based on the channel response information of the resource element occupied by the reference signal which has suffered from interference elimination, the channel estimating unit estimates the channel response of the resource element of downlink transmission data. The apparatus is capable of eliminating the interlayer interference contained in the initial channel response of the reference signal, and increasing channel estimation accuracy and system performance.

Description

Channel estimating apparatus, method and subscriber equipment

Technical field

The present invention relates to the communications field, particularly channel estimating apparatus, method and the subscriber equipment in a kind of LTE-Advanced system.

Background technology

3GPP LTE-Advanced is the one preferred technique of present the 4th third-generation mobile communication.For supporting peak rate to reach the downlink transfer of 1Gbps, LTE-Advanced R10 agreement has adopted wave beam forming (beamforming) and precoding (precoding) technology of the UE DRS (Dedicated Reference Signal) (UE-specific Reference Signals) based on 8 ports.At LTE-Advanced subscriber equipment receiving terminal, for the detection that is concerned with, be usually used to follow the tracks of and predict the real-time change of wireless transmission channel based on the channel estimation technique of UE DRS (Dedicated Reference Signal).

Traditional frequency division multiplexing (FDM has not only been adopted in design up to the UE DRS (Dedicated Reference Signal) of 8 ports in the LTE-Advanced R10 agreement, frequency division multiplexing) and time division multiplexing (TDM, time division multiplexing), and adopted based on two-dimensional quadrature code (2D-OCC, two-dimensional orthogonal cover code) code division multiplexing technology (CDM, code division multiplexing), realized that maximum 8 layers of downlink transmission data can utilize identical running time-frequency resource to transmit simultaneously.

At LTE-Advanced subscriber equipment receiving terminal, the channel response that experiences for the data message of the different transport layers that obtain respectively overlaping, at first can carry out to the received signal demultiplexing and despreading processes, the initial channel response of locating to obtain the shared resource particle of UE special signal (RE:resource element), the initial channel response of then locating based on the shared resource particle of UE special signal (RE:resource element) is carried out the channel response that interpolation processing obtains the shared Resource Unit of data message place.

But, the inventor finds that the defective of prior art is: not only comprise the evaluated error of other resource particle in the signal group in the initial channel response of UE DRS (Dedicated Reference Signal), also comprise the interlayer interference from other transport layers that overlap with the target downlink transport layer.And at present the channel response at data message resource particle place is estimated no matter to use linear interpolation or classical least mean-square error (MMSE, Minimum Mean Squared Error) conventional method such as filtering does not comprise the processing to this interference, so the interlayer interference that comprises in the UE DRS (Dedicated Reference Signal) initial channel response will certainly bring the reduction of precision of channel estimation and the decline of systematic function.

Summary of the invention

The embodiment of the invention provides a kind of channel estimating apparatus, method and subscriber equipment, and purpose is to eliminate the interlayer interference that comprises in the reference signal initial channel response.

An aspect according to the embodiment of the invention provides a kind of channel estimating apparatus, and described channel estimating apparatus comprises:

Pretreatment unit utilizes the reference signal sequence that generates in advance to carry out to received signal demultiplexing and despreading and processes, the initial channel response information at the shared resource particle of the reference signal place in the downlink transfer layer that is superimposed together with extraction;

Interference cancellation unit is disturbed elimination according to the interference cancellation matrix and the described initial channel response information that are used for the elimination interlayer interference, obtains to eliminate the channel response information at the shared resource particle of the reference signal place after disturbing;

Channel estimating unit based on the channel response information at the shared resource particle of the reference signal place after the described elimination interference, is estimated the channel response at the shared resource particle of downlink transmission data place.

Another aspect according to the embodiment of the invention also provides a kind of channel estimation methods, and described channel estimation methods comprises:

Utilize the reference signal sequence that generates in advance to carry out to received signal demultiplexing and despreading and process, the initial channel response information at the shared resource particle of the reference signal place in the downlink transfer layer that is superimposed together with extraction;

Disturb elimination according to the interference cancellation matrix and the described initial channel response information that are used for the elimination interlayer interference, obtain to eliminate the channel response information at the shared resource particle of the reference signal place after disturbing;

Based on the channel response information at the shared resource particle of the reference signal place after the described elimination interference, estimate the channel response at the shared resource particle of downlink transmission data place.

Another aspect according to the embodiment of the invention also provides a kind of subscriber equipment, and described subscriber equipment comprises foregoing channel estimating apparatus.

Beneficial effect of the present invention is: disturb elimination by the interference cancellation matrix and the initial channel response information that are used for the elimination interlayer interference, can eliminate the interlayer interference that comprises in the reference signal initial channel response, improve precision and the systematic function of channel estimating.

Explanation and accompanying drawing with reference to hereinafter disclose particular implementation of the present invention in detail, and having indicated principle of the present invention can adopted mode.Should be appreciated that, embodiments of the present invention on scope not thereby be restricted.In the scope of the spirit of claims and clause, embodiments of the present invention comprise many changes, revise and are equal to.

Can in one or more other execution mode, use in identical or similar mode for the feature that a kind of execution mode is described and/or illustrated, combined with the feature in other execution mode, or the feature in alternative other execution mode.

Should emphasize that term " comprises/comprise " existence that refers to feature, whole, step or assembly when this paper uses, but not get rid of the existence of one or more further feature, whole, step or assembly or additional.

Description of drawings

Fig. 1 is the schematic diagram of traditional channel estimation methods based on the UE reference signal;

Fig. 2 is the schematic diagram of UE DRS (Dedicated Reference Signal) structure;

Fig. 3 is the formation schematic diagram of the channel estimating apparatus of the embodiment of the invention;

Fig. 4 is the another formation schematic diagram of the channel estimating apparatus of the embodiment of the invention;

Fig. 5 is the schematic diagram of a simulation performance of the embodiment of the invention;

Fig. 6 is the flow chart of the channel estimation methods of the embodiment of the invention;

Fig. 7 is the another flow chart of the channel estimation methods of the embodiment of the invention;

Fig. 8 is a schematic diagram of the channel estimation methods of the embodiment of the invention.

Embodiment

With reference to accompanying drawing, by following specification, aforementioned and further feature of the present invention will become obvious.In specification and accompanying drawing, specifically disclose particular implementation of the present invention, it has shown the part execution mode that wherein can adopt principle of the present invention, will be appreciated that, the invention is not restricted to described execution mode, on the contrary, the present invention includes interior whole modifications, modification and the equivalent of scope that falls into claims.

The UE DRS (Dedicated Reference Signal) of the embodiment of the invention in the LTE-Advanced system describes as example.But it should be noted that the present invention is not limited to this, for example can also be applied in other the communication system.And also be not limited to the UE DRS (Dedicated Reference Signal), can also be applied to other signal, the reference signal of the code division multiplexing CDM design of for example having used can be used the present invention.

Fig. 1 is the schematic diagram of traditional channel estimation methods based on the UE reference signal.Wherein, r (*) expression UE receives signal,

The estimated result of expression channel response, i represents the numbering of reception antenna, and j represents the numbering of descending transmission number of data layers, and n represents the descending time slot numbering, and k represents shared frequency domain resource numbering, l represents shared time-domain symbol label.

As shown in Figure 1, receive signal r (i, n, k, l) input UE special signal resource particle initial channel response estimation unit and carry out demultiplexing and despreading processing, obtain the UE special signal resource particle place initial channel response of different downlink transfer layers

Wherein, to have adopted spreading factor (SF:spreading factor) be 4 two-dimensional quadrature code in the design of UE DRS (Dedicated Reference Signal).

Fig. 2 is the schematic diagram of UE DRS (Dedicated Reference Signal) structure.Such as mistake! Do not find Reference source.Shown in, the UE DRS (Dedicated Reference Signal) of the identical running time-frequency resource of use in the Resource Block can be divided into 7 reference signal group S according to different orthogonal code sets _i((i=0 ..., 6).Its despreading is processed can dual mode: based on the despreading of time domain direction with based on the despreading of frequency domain direction.

Wherein, the despreading of time domain direction is processed and is based on D _i(i=0,1,2), its Output rusults can following formula [1] shown in.The despreading of frequency domain direction is based on S _i(i=3,4,5,6), its Output rusults can following formula [2] shown in.Wherein α (p, k, l) is the UE reference signal sequence of the corresponding Resource Unit of port p.

${\tilde{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,S_m)$

$={\tilde{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,k,l)={\tilde{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,k,l+1)={\tilde{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,k,l+7)={\tilde{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,k,l+8)$

$=\frac{1}{4}\underset{l^{\′}-\mathrm{0,1,7,8}}{\mathrm{\Σ}}r(i,n,k,l+l^{\′})*{\mathrm{\α}}^{*}(j+7,k,l+l^{\′})$

(m＝0，1，2；k＝5*m+offset)

[1]

${\tilde{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,S_m)$

$={\tilde{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,k,l)={\tilde{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,k,l+1)={\tilde{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,k+5,l)={\tilde{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,k+5,l+1)$

$=\frac{1}{4}\underset{k^{\′}=\mathrm{0,5}}{\mathrm{\Σ}}\underset{l^{\′}=\mathrm{0,1}}{\mathrm{\Σ}}r(i,n,k+k^{\′},l+l^{\′})*{\mathrm{\α}}^{*}(j+7,k+k^{\′},l+l^{\′})$

(m＝3，4，5，6；k＝5*(m-3)+offset)

[2]

As shown in Figure 2, with H (i, j, n, k, l) expression real channel response, then the channel response that experiences of the port 7UE DRS (Dedicated Reference Signal) in the ground floor downlink transfer (j=0) at Resource Unit A place can be expressed as:

In the following formula

Represent the UE DRS (Dedicated Reference Signal) group S in the j layer downlink transfer ₀The mean value of the real channel response of experiencing,

The estimated value of expression white Gaussian noise, and

Represent the UE DRS (Dedicated Reference Signal) group S in the j layer downlink transfer ₀The interlayer interference from j ' layer that comprises in estimating of initial channel response.

Can be found out by above-mentioned formula [3] and formula [4], the evaluated error that not only comprises other resource particle in the signal group in the initial channel response of UE DRS (Dedicated Reference Signal) also comprises the interlayer interference from other transport layers that overlap with the target downlink transport layer.And the estimation of ensuing channel response to data message resource particle place uses linear interpolation or the classical conventional methods such as MMSE filtering not to comprise processing to this interference, so the interlayer interference that comprises in the UE DRS (Dedicated Reference Signal) initial channel response will certainly bring the reduction of precision of channel estimation and the decline of systematic function.

Embodiment 1

The embodiment of the invention provides a kind of channel estimating apparatus, and Fig. 3 is the formation schematic diagram of the channel estimating apparatus of the embodiment of the invention.As shown in Figure 3, described channel estimating apparatus comprises: pretreatment unit 301, interference cancellation unit 302 and channel estimating unit 303;

Wherein, pretreatment unit 301 utilizes the reference signal sequence that generates in advance to carry out to received signal demultiplexing and despreading and processes, the initial channel response information at the shared resource particle of the reference signal place in the downlink transfer layer that is superimposed together with extraction; Interference cancellation unit 302 is disturbed elimination according to interference cancellation matrix and this initial channel response information of being used for the elimination interlayer interference, obtains to eliminate the channel response information at the shared resource particle of the reference signal place after disturbing; Channel estimating unit 303 is estimated the channel response at the shared resource particle of downlink transmission data place based on the channel response information of eliminating the shared resource particle of the reference signal place after disturbing.

In the specific implementation, the interference cancellation matrix that should be used for the elimination interlayer interference can rule of thumb be worth acquisition, also can generate according to the statistical property of transmission channel.Interference cancellation unit 302 can be carried out smoothing processing according to this interference cancellation matrix and this initial channel response information, for example this interference cancellation matrix and this initial channel response information can be multiplied each other, the channel response information at the shared resource particle of the reference signal place after the interlayer interference is eliminated in acquisition.

In one embodiment, pretreatment unit 301 can carry out demultiplexing and the despreading of time-based direction to be processed, and its Output rusults can be shown in formula [1].Output rusults can be expressed as the form of vector:

${\stackrel{\→}{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,S)=\left[\begin{array}{c}{\tilde{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,S_0)\\ {\tilde{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,S_1)\\ {\tilde{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,S_2)\end{array}\right]---\left[5\right]$

For example: if the prediction transmission channel is linear in the variation of frequency domain direction, then interference cancellation matrix can adopt

$W_{\mathrm{IM}}=\left[\begin{array}{ccc}0.5& 0.5& 0\\ 0& 0.5& 0.5\end{array}\right]---\left[6\right]$

Then use interference cancellation matrix that the initial channel response at UE DRS (Dedicated Reference Signal) resource particle place is processed, Output rusults can for:

${\stackrel{\→}{H}}_{\mathrm{IM}\_\mathrm{TD}}(i,j,n,S^{\′})=W_{\mathrm{IM}}*{\stackrel{\→}{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,S)---\left[7\right]$

At last, come the channel response at data estimator information resources particle place based on the channel response through the UE DRS (Dedicated Reference Signal) resource particle place after the interference elimination, and export following result.

$\tilde{H}(i,j,n,k,l)=f\left({\stackrel{\→}{H}}_{\mathrm{ZF}\_\mathrm{TD}}(i,j,n,S)\right)---\left[8\right]$

Wherein, data message resource particle place channel response estimation function f (*) can be linear interpolation or MMSE etc.In another embodiment, pretreatment unit 301 can also carry out processing based on the demultiplexing of frequency direction and despreading, and its Output rusults can be shown in formula [2].Output rusults can be expressed as the form of vector:

${\stackrel{\→}{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,S)=\left[\begin{array}{c}{\tilde{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,S_3)\\ {\tilde{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,S_4)\\ {\tilde{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,S_5)\\ {\tilde{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,S_6)\end{array}\right]---\left[9\right]$

For example: if predicted channel is linear in the variation of frequency domain direction, then interference cancellation matrix can adopt

$W_{\mathrm{IM}}=\left[\begin{array}{cccc}0.5& 0.5& 0& 0\\ 0& 0& 0.5& 0.5\\ 0.5& 0& 0.5& 0\\ 0& 0.5& 0& 0.5\end{array}\right]---\left[10\right]$

Then use interference cancellation matrix that the initial channel response at UE DRS (Dedicated Reference Signal) resource particle place is processed, Output rusults is:

${\stackrel{\→}{H}}_{\mathrm{IM}\_\mathrm{FD}}(i,j,n,S^{\′})=W_{\mathrm{IM}}*{\stackrel{\→}{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,S)---\left[11\right]$

At last, based on the channel response that comes data estimator information resources particle place through the channel response that disturbs the UE DRS (Dedicated Reference Signal) resource particle place after eliminating, and output.

$\tilde{H}(i,j,n,k,l)=f\left({\stackrel{\→}{H}}_{\mathrm{ZF}\_\mathrm{FD}}(i,j,n,S)\right)---\left[12\right]$

Wherein, data message resource particle place channel response estimation function f (*) can be linear interpolation or MMSE etc.

It should be noted that and abovely only carry out processing based on the demultiplexing of time domain direction and despreading with pretreatment unit that interference cancellation unit is disturbed to eliminate at frequency domain direction and is example; Perhaps only carry out processing based on demultiplexing and the despreading of frequency domain direction with pretreatment unit, interference cancellation unit is disturbed at frequency domain direction and is eliminated as example describes, but the invention is not restricted to this.

In the present embodiment, pretreatment unit can also carry out processing based on the demultiplexing of frequency domain direction and despreading, and interference cancellation unit is disturbed elimination in time domain direction or frequency domain direction; Perhaps pretreatment unit carries out processing based on demultiplexing and the despreading of time domain direction, and interference cancellation unit is disturbed elimination at frequency domain direction; Perhaps pretreatment unit carries out processing based on demultiplexing and the despreading of time domain and frequency domain direction, and interference cancellation unit is disturbed elimination in time domain and frequency domain direction.Can determine concrete execution mode according to actual conditions.

Embodiment 2

The embodiment of the invention provides a kind of channel estimating apparatus, and on the basis of embodiment 1, the interference cancellation matrix that the statistical property according to transmission channel is generated is elaborated.Wherein, the content identical with embodiment 1 repeats no more herein.

Fig. 4 is the another formation schematic diagram of the channel estimating apparatus of the embodiment of the invention.As shown in Figure 4, described channel estimating apparatus comprises: pretreatment unit 401, interference cancellation unit 402 and channel estimating unit 403.In addition, this channel estimating apparatus can also comprise: matrix calculation unit 404 is used for generating this interference cancellation matrix according to the statistical property of transmission channel.

In the specific implementation, matrix calculation unit 404 specifically can be used for: based on signal to noise ratio, Doppler frequency shift or the time delay extend information of transmission channel at least one, carry out least mean-square error and estimate to calculate interference cancellation matrix.

In the present embodiment, can generate interference cancellation matrix based on channel statistic.Wherein the estimation of channel statistic can use the initial channel response of UE DRS (Dedicated Reference Signal) to carry out, also can be based on other reference signals, cell special reference (CRS for example, cell-specific RS) or channel state information reference signals (CSI-RS, channel state information RS) estimate.

For example, can according to the statistical property of transmission channel, comprise signal to noise ratio (γ), Doppler frequency shift (F _d) and time delay expansion (τ), generate interference cancellation matrix W _LMCan be expressed as particularly:

$W_{\mathrm{IM}}=E\left\{H(k_{\mathrm{UERS}},l_{\mathrm{UERS}})H^{*}(k_{\mathrm{UERS}}^{\′},l_{\mathrm{UERS}}^{\′})\right\}{\left[E\right\{H(k_{\mathrm{UERS}},l_{\mathrm{UERS}})H^{*}(k_{\mathrm{UERS}}^{\′},l_{\mathrm{UERS}}^{\′})\}+\frac{1}{\mathrm{\γ}}I]}^{-1}---\left[13\right]$

Wherein, I is unit matrix, E{H (k _UERS, l _UERS) H ^*(k ' _UERS, l ' _UERS) be the auto-correlation function of UERS sequence, can be expressed as:

E{H(k _UERS，l _UERS)H ^*(k′ _UERS，l′ _UERS)}＝f(F _d，τ，(k _UERS，l _UERS)，(k′ _UERS，l′ _UERS))

[14]

It should be noted that and abovely only expand to example with signal to noise ratio, Doppler frequency shift or time delay and describe.But be not limited to this, can also carry out suitable distortion to above-mentioned formula.For example, if be applied under the special screne, such as the inactive state (F of this moment _d=0), the auto-correlation function in the formula [14] can be expressed as so

E{H(k _UERS，l _UERS)H ^*(k′ _UERS，l′ _UERS)}＝f(τ，(k _UERS，l _UERS)，(K′ _UERS，l′ _UERS))

[15]

Fig. 5 is the schematic diagram of a simulation performance of the embodiment of the invention.Wherein, specifically adopted formula [5] to formula [8], the simulation configurations environment is that the downlink transmission data number of plies is 8, and number of transmit antennas is 8, and the reception antenna number is 8, and channel is ETU5, and bandwidth is 10MHz.As shown in Figure 5, disturb the estimated accuracy of eliminating the channel response that has improved UE DRS (Dedicated Reference Signal) resource particle place.

By above-described embodiment as can be known, disturb elimination by the interference cancellation matrix and the initial channel response information that are used for the elimination interlayer interference, can eliminate the interlayer interference that comprises in the reference signal initial channel response, improve precision and the systematic function of channel estimating.

Embodiment 3

The embodiment of the invention also provides a kind of channel estimation methods, and the content identical with said apparatus do not given unnecessary details herein.Fig. 6 is the flow chart of the channel estimation methods of the embodiment of the invention, and as shown in Figure 6, described channel estimation methods comprises:

Step 601 is utilized the reference signal sequence that generates in advance to carry out to received signal demultiplexing and despreading and is processed, the initial channel response information at the shared resource particle of the reference signal place in the downlink transfer layer that is superimposed together with extraction;

Step 602 is disturbed elimination according to interference cancellation matrix and this initial channel response information of being used for the elimination interlayer interference, obtains to eliminate the channel response information at the shared resource particle of the reference signal place after disturbing;

Step 603 based on the channel response information of eliminating the shared resource particle of the reference signal place after disturbing, is estimated the channel response at the shared resource particle of downlink transmission data place.

In the specific implementation, the interference cancellation matrix that should be used for the elimination interlayer interference can rule of thumb be worth acquisition, also can generate according to the statistical property of transmission channel.Can carry out smoothing processing according to this interference cancellation matrix and this initial channel response information, for example this interference cancellation matrix and this initial channel response information can be multiplied each other, the initial channel response information after the interlayer interference is eliminated in acquisition.

In one embodiment, can carry out processing based on demultiplexing and the despreading of time domain direction, and disturb elimination at frequency domain direction.For example, predicted channel is linear in the variation of frequency domain direction, then this interference cancellation matrix can for:

$W_{\mathrm{IM}}=\left[\begin{array}{ccc}0.5& 0.5& 0\\ 0& 0.5& 0.5\end{array}\right]$

In another embodiment, can carry out processing based on demultiplexing and the despreading of frequency domain direction, and disturb elimination at frequency domain direction.For example, predicted channel is linear in the variation of frequency domain direction, then this interference cancellation matrix can for:

$W_{\mathrm{IM}}=\left[\begin{array}{cccc}0.5& 0.5& 0& 0\\ 0& 0& 0.5& 0.5\\ 0.5& 0& 0.5& 0\\ 0& 0.5& 0& 0.5\end{array}\right]$

In another execution mode, can carry out processing based on demultiplexing and the despreading of frequency domain direction, and disturb elimination in time domain direction or frequency domain direction; Perhaps carry out processing based on demultiplexing and the despreading of time domain direction, and disturb elimination at frequency domain direction; Perhaps carry out processing based on demultiplexing and the despreading of time domain and frequency domain direction, and disturb elimination in time domain and frequency domain direction.

Embodiment 4

The embodiment of the invention provides a kind of channel estimation methods, on the basis of embodiment 3 statistical property according to transmission channel is generated interference cancellation matrix and is elaborated.Wherein, the content identical with embodiment 3 repeats no more herein.

In the present embodiment, can generate interference cancellation matrix based on channel statistic.When generating interference cancellation matrix according to the statistical property of transmission channel, can use the initial channel response of UE DRS (Dedicated Reference Signal), perhaps use the initial channel response of cell special reference, perhaps use the initial channel response of channel state information reference signals.

Fig. 7 is the another flow chart of the channel estimation methods of the embodiment of the invention, and as shown in Figure 7, described channel estimation methods comprises:

Step 701 is utilized the reference signal sequence that generates in advance to carry out to received signal demultiplexing and despreading and is processed, the initial channel response information at the shared resource particle of the reference signal place in the downlink transfer layer that is superimposed together with extraction.

Step 702 is according to the statistical property generation interference cancellation matrix of transmission channel.

In the specific implementation, can based in signal to noise ratio, Doppler frequency shift or the time delay extend information of transmission channel at least one, carry out least mean-square error and estimate to calculate interference cancellation matrix.

Step 703 is disturbed elimination according to interference cancellation matrix and this initial channel response information of being used for the elimination interlayer interference, obtains to eliminate the channel response information at the shared resource particle of the reference signal place after disturbing.

Step 704 based on the channel response information of eliminating the shared resource particle of the reference signal place after disturbing, is estimated the channel response at the shared resource particle of downlink transmission data place.

Fig. 8 is a schematic diagram of the channel estimation methods of the embodiment of the invention, describes as an example of the UE DRS (Dedicated Reference Signal) example again.As shown in Figure 8, receive signal r (i, j, n, k, l) and at first can by demultiplexing and de-spreading operation, obtain the initialize signal response at UE DRS (Dedicated Reference Signal) resource particle place

Next, can generate interference cancellation matrix W according to the statistical property of transmission channel _LMThen the initial channel response with interference cancellation matrix and UE DRS (Dedicated Reference Signal) resource particle place multiplies each other, and obtains

Based on the channel response that disturbs the UE DRS (Dedicated Reference Signal) resource particle place after eliminating, come the channel response at data estimator information resources particle place at last.

The embodiment of the invention also provides a kind of subscriber equipment, and this subscriber equipment comprises foregoing channel estimating apparatus.

By above-described embodiment as can be known, disturb elimination by the interference cancellation matrix and the initial channel response information that are used for the elimination interlayer interference, can eliminate the interlayer interference that comprises in the reference signal initial channel response, improve precision and the systematic function of channel estimating.

The above apparatus and method of the present invention can be realized by hardware, also can be realized by combination of hardware software.The present invention relates to such computer-readable program, when this program is performed by logical block, can make this logical block realize device or component parts mentioned above, or make this logical block realize the whole bag of tricks or step mentioned above.The invention still further relates to be used to the storage medium of storing above program, such as hard disk, disk, CD, DVD, flash memory etc.

Invention has been described for the concrete execution mode of above combination, but it will be apparent to those skilled in the art that these descriptions all are exemplary, is not limiting the scope of the invention.Those skilled in the art can make various variants and modifications to the present invention according to spirit of the present invention and principle, and these variants and modifications also within the scope of the invention.

About comprising the execution mode of above embodiment, following remarks is also disclosed:

(remarks 1) a kind of channel estimating apparatus, described channel estimating apparatus comprises:

Pretreatment unit utilizes the reference signal sequence that generates in advance to carry out to received signal demultiplexing and despreading and processes, the initial channel response information at the shared resource particle of the reference signal place in the downlink transfer layer that is superimposed together with extraction;

Interference cancellation unit is disturbed elimination according to the interference cancellation matrix and the described initial channel response information that are used for the elimination interlayer interference, obtains to eliminate the channel response information at the shared resource particle of the reference signal place after disturbing;

Channel estimating unit based on the channel response information at the shared resource particle of the reference signal place after the described elimination interference, is estimated the channel response at the shared resource particle of downlink transmission data place.

According to remarks 1 described channel estimating apparatus, wherein, described channel estimating apparatus also comprises (remarks 2):

Matrix calculation unit generates described interference cancellation matrix according to the statistical property of transmission channel.

(remarks 3) according to remarks 1 described channel estimating apparatus, wherein, described interference cancellation matrix rule of thumb is worth in advance generation.

(remarks 4) is according to remarks 2 described channel estimating apparatus, wherein, described matrix calculation unit specifically is used for: based on signal to noise ratio, Doppler frequency shift or the time delay extend information of described transmission channel at least one, carry out least mean-square error and estimate to calculate described interference cancellation matrix.

(remarks 5) is according to remarks 2 described channel estimating apparatus, wherein, the initial channel response of described matrix calculation unit user's device-specific reference signal is carried out the estimation of transmission channel statistical property, perhaps use the initial channel response of cell special reference to carry out the estimation of transmission channel statistical property, perhaps use the initial channel response of channel state information reference signals to carry out the estimation of transmission channel statistical property.

According to remarks 1 described channel estimating apparatus, wherein, described pretreatment unit carries out processing based on the demultiplexing of time domain direction and despreading (remarks 6), and described interference cancellation unit is disturbed elimination at frequency domain direction.

(remarks 7) according to remarks 6 described channel estimating apparatus, wherein, predicted channel is linear in the variation of frequency domain direction, and described interference cancellation matrix is:

$W_{\mathrm{IM}}=\left[\begin{array}{ccc}0.5& 0.5& 0\\ 0& 0.5& 0.5\end{array}\right]$

According to remarks 1 described channel estimating apparatus, wherein, described pretreatment unit carries out processing based on the demultiplexing of frequency domain direction and despreading (remarks 8), and described interference cancellation unit is disturbed elimination at frequency domain direction or time domain direction.

(remarks 9) according to remarks 7 described channel estimating apparatus, wherein, predicted channel is linear in the variation of frequency domain direction, and described interference cancellation matrix is:

$W_{\mathrm{IM}}=\left[\begin{array}{cccc}0.5& 0.5& 0& 0\\ 0& 0& 0.5& 0.5\\ 0.5& 0& 0.5& 0\\ 0& 0.5& 0& 0.5\end{array}\right]$

According to remarks 1 described channel estimating apparatus, wherein, described pretreatment unit carries out processing based on the demultiplexing of frequency domain direction and despreading (remarks 10), and described interference cancellation unit is disturbed elimination in time domain direction or frequency domain direction; Perhaps, described pretreatment unit carries out processing based on the demultiplexing of time domain direction and despreading, and described interference cancellation unit is disturbed elimination at frequency domain direction; Perhaps, described pretreatment unit carries out processing based on the demultiplexing of time domain and frequency domain direction and despreading, and described interference cancellation unit is disturbed elimination in time domain and frequency domain direction.

(remarks 11) a kind of channel estimation methods, described channel estimation methods comprises:

Utilize the reference signal sequence that generates in advance to carry out to received signal demultiplexing and despreading and process, the initial channel response information at the shared resource particle of the reference signal place in the downlink transfer layer that is superimposed together with extraction;

Disturb elimination according to the interference cancellation matrix and the described initial channel response information that are used for the elimination interlayer interference, obtain to eliminate the channel response information at the shared resource particle of the reference signal place after disturbing;

Based on the channel response information at the shared resource particle of the reference signal place after the described elimination interference, estimate the channel response at the shared resource particle of downlink transmission data place.

According to remarks 11 described channel estimation methods, wherein, described channel estimation methods also comprises (remarks 12):

Statistical property according to transmission channel generates described interference cancellation matrix.

(remarks 13) is according to remarks 12 described channel estimation methods, wherein, generating described interference cancellation matrix according to the statistical property of transmission channel specifically comprises: based in signal to noise ratio, Doppler frequency shift or the time delay extend information of described transmission channel at least one, carry out least mean-square error and estimate to calculate described interference cancellation matrix.

(remarks 14) is according to remarks 12 described channel estimation methods, wherein, when generating described interference cancellation matrix according to the statistical property of transmission channel, the initial channel response of user's device-specific reference signal is carried out the estimation of transmission channel statistical property, perhaps use the initial channel response of cell special reference to carry out the estimation of transmission channel statistical property, perhaps use the initial channel response of channel state information reference signals to carry out the estimation of transmission channel statistical property.

(remarks 15) wherein, carries out processing based on demultiplexing and the despreading of time domain direction, and disturbs elimination at frequency domain direction according to remarks 11 described channel estimation methods.

(remarks 16) according to remarks 15 described channel estimation methods, wherein, predicted channel is linear in the variation of frequency domain direction, and described interference cancellation matrix is:

$W_{\mathrm{IM}}=\left[\begin{array}{ccc}0.5& 0.5& 0\\ 0& 0.5& 0.5\end{array}\right]$

(remarks 17) wherein, carries out processing based on demultiplexing and the despreading of frequency domain direction, and disturbs elimination at frequency domain direction or time domain direction according to remarks 11 described channel estimation methods.

(remarks 18) according to remarks 17 described channel estimation methods, wherein, predicted channel is linear in the variation of frequency domain direction, and described interference cancellation matrix is:

$W_{\mathrm{IM}}=\left[\begin{array}{cccc}0.5& 0.5& 0& 0\\ 0& 0& 0.5& 0.5\\ 0.5& 0& 0.5& 0\\ 0& 0.5& 0& 0.5\end{array}\right]$

(remarks 19) wherein, carries out processing based on demultiplexing and the despreading of frequency domain direction, and disturbs elimination in time domain direction or time domain direction according to remarks 11 described channel estimation methods; Perhaps carry out processing based on demultiplexing and the despreading of time domain direction, and disturb elimination at frequency domain direction; Perhaps carry out processing based on demultiplexing and the despreading of time domain and frequency domain direction, and disturb elimination in time domain and frequency domain direction.

(remarks 20) a kind of subscriber equipment, described subscriber equipment comprise such as remarks 1 to 10 each described channel estimating apparatus.

Claims (10)

1. channel estimating apparatus, described channel estimating apparatus comprises:

Pretreatment unit utilizes the reference signal sequence that generates in advance to carry out to received signal demultiplexing and despreading and processes, the initial channel response information at the shared resource particle of the reference signal place in the downlink transfer layer that is superimposed together with extraction;

Interference cancellation unit is disturbed elimination according to the interference cancellation matrix and the described initial channel response information that are used for the elimination interlayer interference, obtains to eliminate the channel response information at the shared resource particle of the reference signal place after disturbing;

Channel estimating unit based on the channel response information at the shared resource particle of the reference signal place after the described elimination interference, is estimated the channel response at the shared resource particle of downlink transmission data place.

2. channel estimating apparatus according to claim 1, wherein, described channel estimating apparatus also comprises:

Matrix calculation unit generates described interference cancellation matrix according to the statistical property of transmission channel.

3. channel estimating apparatus according to claim 2, wherein, described matrix calculation unit specifically is used for: based on signal to noise ratio, Doppler frequency shift or the time delay extend information of described transmission channel at least one, carry out least mean-square error and estimate to calculate described interference cancellation matrix.

4. channel estimating apparatus according to claim 2, wherein, the initial channel response of described matrix calculation unit user's device-specific reference signal is carried out the estimation of transmission channel statistical property, perhaps use the initial channel response of cell special reference to carry out the estimation of transmission channel statistical property, perhaps use the initial channel response of channel state information reference signals to carry out the estimation of transmission channel statistical property.

5. channel estimating apparatus according to claim 1, wherein, described pretreatment unit carries out processing based on the demultiplexing of time domain direction and despreading, and described interference cancellation unit is disturbed elimination at frequency domain direction; Perhaps, described pretreatment unit carries out processing based on the demultiplexing of frequency domain direction and despreading, and described interference cancellation unit is disturbed elimination in time domain direction or frequency domain direction.

6. channel estimating apparatus according to claim 1, wherein, described pretreatment unit carries out processing based on the demultiplexing of frequency domain direction and despreading, and described interference cancellation unit is disturbed elimination in the time domain direction; Perhaps, described pretreatment unit carries out processing based on the demultiplexing of frequency domain direction and despreading, and described interference cancellation unit is disturbed elimination in time domain direction or frequency domain direction; Perhaps, described pretreatment unit carries out processing based on the demultiplexing of time domain and frequency domain direction and despreading, and described interference cancellation unit is disturbed elimination in time domain and frequency domain direction.

7. channel estimation methods, described channel estimation methods comprises:

Utilize the reference signal sequence that generates in advance to carry out to received signal demultiplexing and despreading and process, the initial channel response information at the shared resource particle of the reference signal place in the downlink transfer layer that is superimposed together with extraction;

Disturb elimination according to the interference cancellation matrix and the described initial channel response information that are used for the elimination interlayer interference, obtain to eliminate the channel response information at the shared resource particle of the reference signal place after disturbing;

Based on the channel response information at the shared resource particle of the reference signal place after the described elimination interference, estimate the channel response at the shared resource particle of downlink transmission data place.

8. channel estimation methods according to claim 7, wherein, described channel estimation methods also comprises:

Statistical property according to transmission channel generates described interference cancellation matrix.

9. channel estimation methods according to claim 8, wherein, generating described interference cancellation matrix according to the statistical property of transmission channel specifically comprises: based in signal to noise ratio, Doppler frequency shift or the time delay extend information of described transmission channel at least one, carry out least mean-square error and estimate to calculate described interference cancellation matrix.

10. subscriber equipment, described subscriber equipment comprises such as each described channel estimating apparatus of claim 1 to 6.

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