CN103368874B - Channel estimating apparatus, method and subscriber equipment - Google Patents

Abstract

The embodiment of the present invention provides a kind of channel estimating apparatus, method and subscriber equipment, described channel estimating apparatus includes: pretreatment unit, the reference signal sequence previously generated is utilized to carry out to received signal demultiplexing and despreading process, to extract the initial channel response information at resource particle place shared by the reference signal in the downlink transfer layer being superimposed together；Interference cancellation unit, carries out interference according to the interference cancellation matrix and described initial channel response information for eliminating interlayer interference and eliminates, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interference；Channel estimating unit, the channel response information at resource particle place shared by the reference signal after disturbing based on described elimination, estimate the channel response at resource particle place shared by downlink transmission data.Pass through the embodiment of the present invention, it is possible to eliminate the interlayer interference comprised in reference signal initial channel response, improve precision and the systematic function of channel estimating.

Description

Channel estimating apparatus, method and subscriber equipment

Technical field

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

Background technology

3GPPLTE-Advanced is the one preferred technique of current forth generation mobile communication.For supporting that peak rate reaches the downlink transfer of 1Gbps, LTE-AdvancedR10 agreement have employed wave beam forming (beamforming) and precoding (precoding) technology of the UE DRS (Dedicated Reference Signal) (UE-specificReferenceSignals) based on 8 ports.At LTE-Advanced subscriber equipment receiving terminal, in order to carry out relevant detection, the channel estimation technique based on UE DRS (Dedicated Reference Signal) is usually used to follow the tracks of and predict the real-time change of wireless transmission channel.

In LTE-AdvancedR10 agreement, the design of the UE DRS (Dedicated Reference Signal) of up to 8 ports not use only traditional frequency division multiplexing (FDM, and time division multiplex (TDM frequencydivisionmultiplexing), timedivisionmultiplexing), and have employed based on two-dimensional quadrature code (2D-OCC, two-dimensionalorthogonalcovercode) code division multiplexing technology (CDM, codedivisionmultiplexing), it is achieved that maximum 8 layers of downlink transmission data can utilize identical running time-frequency resource to be transmitted simultaneously.

At LTE-Advanced subscriber equipment receiving terminal, the channel response that data message in order to respectively obtain the different transport layers overlaped experiences, first can carry out to the received signal demultiplexing and despreading process, to obtain the initial channel response at resource particle (RE:resourceelement) place shared by UE special signal, be then based on the initial channel response at resource particle (RE:resourceelement) place shared by UE special signal be interpolated process obtain the channel response at Resource Unit place shared by data message.

But, inventor have found that prior art has the disadvantage that: the initial channel response of UE DRS (Dedicated Reference Signal) not only includes the estimation difference of other resource particle in signal group, also include the interlayer interference from other transport layers overlaped with target downlink transport layer.And the channel response at data message resource particle place is estimated no matter to use linear interpolation or classical least mean-square error (MMSE at present, MinimumMeanSquaredError) traditional method such as filtering does not comprise the process to this interference, and the interlayer interference therefore comprised in 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 present invention provides a kind of channel estimating apparatus, method and subscriber equipment, it is therefore intended that eliminate the interlayer interference comprised in reference signal initial channel response.

An aspect according to embodiments of the present invention, it is provided that a kind of channel estimating apparatus, described channel estimating apparatus includes:

Pretreatment unit, utilizes the reference signal sequence previously generated to carry out to received signal demultiplexing and despreading process, to extract the initial channel response information at resource particle place shared by the reference signal in the downlink transfer layer being superimposed together；

Interference cancellation unit, carries out interference according to the interference cancellation matrix and described initial channel response information for eliminating interlayer interference and eliminates, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interference；

Channel estimating unit, the channel response information at resource particle place shared by the reference signal after disturbing based on described elimination, estimate the channel response at resource particle place shared by downlink transmission data.

Another aspect according to embodiments of the present invention, also provides for a kind of channel estimation methods, and described channel estimation methods includes:

The reference signal sequence previously generated is utilized to carry out to received signal demultiplexing and despreading process, to extract the initial channel response information at resource particle place shared by the reference signal in the downlink transfer layer being superimposed together；

Carry out interference according to the interference cancellation matrix and described initial channel response information for eliminating interlayer interference to eliminate, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interference；

The channel response information at resource particle place shared by reference signal after disturbing based on described elimination, estimates the channel response at resource particle place shared by downlink transmission data.

Another aspect according to embodiments of the present invention, also provides for a kind of subscriber equipment, and described subscriber equipment includes foregoing channel estimating apparatus.

The beneficial effects of the present invention is: carry out interference by the interference cancellation matrix and initial channel response information being used for eliminating interlayer interference and eliminate, the interlayer interference comprised in reference signal initial channel response can be eliminated, improve precision and the systematic function of channel estimating.

With reference to explanation hereinafter and accompanying drawing, disclose in detail only certain exemplary embodiments of this invention, specifying principles of the invention can adopted mode.It should be understood that embodiments of the present invention are not so limited in scope.In the spirit of claims and the scope of clause, embodiments of the present invention include many changes, amendment and are equal to.

The feature described for a kind of embodiment and/or illustrate can use in one or more other embodiment in same or similar mode, combined with the feature in other embodiment, or substitutes the feature in other embodiment.

It should be emphasized that term " include/comprise " refers to the existence of feature, one integral piece, step or assembly herein when using, but it is not precluded from the existence of one or more further feature, one integral piece, step or assembly or additional.

Accompanying drawing explanation

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

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

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

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

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

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

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

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

Detailed description of the invention

With reference to accompanying drawing, by description below, the aforementioned and further feature of the present invention will be apparent from.In the specification and illustrated in the drawings, specifically disclose only certain exemplary embodiments of this invention, which show the some embodiments of the principle that wherein can adopt the present invention, will be appreciated that, the invention is not restricted to described embodiment, on the contrary, whole amendments, modification and the equivalent that the present invention includes falling within the scope of the appended claims.

The embodiment of the present invention illustrates for the UE DRS (Dedicated Reference Signal) in LTE-Advanced system.It will be appreciated, however, that the present invention is not limited to this, for instance can also be applied in other communication system.And it is also not necessarily limited to UE DRS (Dedicated Reference Signal), it is also possible to be applied to other signal, for instance the reference signal of the code division multiplexing CDM design employed can apply the present invention.

Fig. 1 is the schematic diagram of traditional channel estimation methods based on UE reference signal.Wherein, r (*) represents that UE receives signal,Representing the estimated result of channel response, i represents the numbering of reception antenna, and j represents the numbering of descending transmission number of data layers, and n represents that descending time slot is numbered, and k represents that shared frequency domain resource is numbered, and l represents shared time-domain symbol label.

As it is 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 process, obtain the UE special signal resource particle place initial channel response of different downlink transfer layerWherein, UE DRS (Dedicated Reference Signal) be designed with the two-dimensional quadrature code that spreading factor (SF:spreadingfactor) is 4.

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) using identical running time-frequency resource in one Resource Block can be divided into 7 reference signal group S according to different orthogonal code sets_i((i=0 ..., 6).Its despreading processes can two ways: the despreading based on time domain direction and the despreading based on frequency domain direction.

Wherein, the despreading in time domain direction processes and is based on D_i(i=0,1,2), its output result can shown in equation below [1].The despreading of frequency domain direction is based on S_i(i=3,4,5,6), its output result can shown in equation below [2].Wherein (p, k l) are the UE reference signal sequence of corresponding Resource Unit of port p to α.

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

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

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

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

In above formulaRepresent the UE DRS (Dedicated Reference Signal) group S in jth layer downlink transfer₀The meansigma methods of the real channel response experienced,Represent the estimated value of white Gaussian noise, andRepresent the UE DRS (Dedicated Reference Signal) group S in jth layer downlink transfer₀Initial channel response estimate in the interlayer interference from jth ' layer that comprises.

Be can be seen that by above-mentioned formula [3] and formula [4], the initial channel response of UE DRS (Dedicated Reference Signal) not only includes the estimation difference of other resource particle in signal group, also includes the interlayer interference from other transport layers overlaped with target downlink transport layer.And the ensuing estimation to the channel response at data message resource particle place uses the traditional method such as linear interpolation or classical MMSE filtering not comprise the process to this interference, the interlayer interference therefore comprised in 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 present invention provides a kind of channel estimating apparatus, and Fig. 3 is the composition schematic diagram of the channel estimating apparatus of the embodiment of the present invention.As it is shown on figure 3, described channel estimating apparatus includes: pretreatment unit 301, interference cancellation unit 302 and channel estimating unit 303；

Wherein, pretreatment unit 301 utilizes the reference signal sequence previously generated to carry out to received signal demultiplexing and despreading process, to extract the initial channel response information at resource particle place shared by the reference signal in the downlink transfer layer being superimposed together；Interference cancellation unit 302 carries out interference elimination according to being used for the interference cancellation matrix eliminating interlayer interference with this initial channel response information, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interference；Channel estimating unit 303, based on eliminating the channel response information at resource particle place shared by the reference signal after interference, estimates the channel response at resource particle place shared by downlink transmission data.

In the specific implementation, this interference cancellation matrix being used for eliminating interlayer interference can obtain based on experience value, it is also possible to generates according to the statistical property of transmission channel.Interference cancellation unit 302 can be smoothed according to this interference cancellation matrix and this initial channel response information, such as this interference cancellation matrix can be multiplied with this initial channel response information, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interlayer interference.

In one embodiment, pretreatment unit 301 can carry out the demultiplexing based on time orientation and despreading processes, and its output result can as shown in formula [1].Output result can be expressed as the form of vector:

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

Such as: if prediction transmission channel is linear in the change 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 using interference cancellation matrix that the initial channel response at UE DRS (Dedicated Reference Signal) resource particle place is processed, output result can be:

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

Finally, estimate the channel response at data message resource particle place based on the channel response at UE DRS (Dedicated Reference Signal) resource particle place after interference eliminates, 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 the demultiplexing based on frequency direction and despreading processes, and its output result can as shown in formula [2].Output result can be expressed as the form of vector:

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

Such as: if prediction channel is linear in the change 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 using interference cancellation matrix that the initial channel response at UE DRS (Dedicated Reference Signal) resource particle place is processed, output result is:

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

Finally, estimate the channel response at data message resource particle place based on the channel response at UE DRS (Dedicated Reference Signal) resource particle place after interference eliminates, and export.

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

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

It should be noted that and above only carry out the demultiplexing based on time domain direction and despreading with pretreatment unit and process, interference cancellation unit carries out interference on frequency domain direction and eliminates as example；Or only carrying out the demultiplexing based on frequency domain direction with pretreatment unit and despreading processes, interference cancellation unit carries out interference elimination on frequency domain direction and illustrates for example, but the invention is not restricted to this.

In the present embodiment, pretreatment unit can also carry out the demultiplexing based on frequency domain direction and despreading processes, and interference cancellation unit carries out interference on time domain direction or frequency domain direction and eliminates；Or pretreatment unit carries out the demultiplexing based on time domain direction and despreading processes, interference cancellation unit carries out interference on frequency domain direction and eliminates；Or pretreatment unit carries out the demultiplexing based on time domain and frequency domain direction and despreading processes, interference cancellation unit carries out interference in time domain and frequency domain direction and eliminates.Specific embodiment can be determined according to practical situation.

Embodiment 2

The embodiment of the present 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 described in detail.Wherein, identical with embodiment 1 content repeats no more herein.

Fig. 4 is the another composition schematic diagram of the channel estimating apparatus of the embodiment of the present invention.As shown in Figure 4, described channel estimating apparatus includes: pretreatment unit 401, interference cancellation unit 402 and channel estimating unit 403.Additionally, this channel estimating apparatus can also include: matrix calculation unit 404, generate this interference cancellation matrix for the statistical property according to transmission channel.

In the specific implementation, matrix calculation unit 404 specifically may be used for: based at least one in the signal to noise ratio of transmission channel, Doppler frequency shift or delay spread information, carries out Minimum Mean Squared Error estimation to calculate interference cancellation matrix.

In the present embodiment, it is possible to 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, can also based on other reference signals, such as cell special reference (CRS, cell-specificRS) or channel state information reference signals (CSI-RS, channelstateinformationRS) estimate.

For example, it is possible to the statistical property according to transmission channel, including signal to noise ratio (γ), Doppler frequency shift (F_d) and delay spread (τ), generate interference cancellation matrix W_LM.Specifically can be expressed as:

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

Wherein, I is unit matrix, E{H (k_UERS, l_UERS)H^*(k′_UERS, l '_UERS) it is the auto-correlation function of UERS sequence, it is possible to it is 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 above only illustrate for signal to noise ratio, Doppler frequency shift or delay spread.But it is not limited to this, it is also possible to above-mentioned formula is carried out suitable deformation.Such as, if being applied under special screne, such as resting state (F now_d=0), then the auto-correlation function in formula [14] can be expressed as

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 present invention.Wherein, specifically have employed formula [5] to formula [8], simulation configurations environment is the downlink transmission data number of plies is 8, and transmitting antenna number is 8, and reception antenna number is 8, and channel is ETU5, and bandwidth is 10MHz.As shown in Figure 5, interference eliminates the estimated accuracy of the channel response that improve UE DRS (Dedicated Reference Signal) resource particle place.

By above-described embodiment it can be seen that carry out interference by the interference cancellation matrix and initial channel response information for eliminating interlayer interference and eliminate, it is possible to eliminate the interlayer interference comprised in reference signal initial channel response, improve precision and the systematic function of channel estimating.

Embodiment 3

The embodiment of the present invention also provides for a kind of channel estimation methods, and the content identical with said apparatus does not repeat herein.Fig. 6 is the flow chart of the channel estimation methods of the embodiment of the present invention, and as shown in Figure 6, described channel estimation methods includes:

Step 601, utilizes the reference signal sequence previously generated to carry out to received signal demultiplexing and despreading process, to extract the initial channel response information at resource particle place shared by the reference signal in the downlink transfer layer being superimposed together；

Step 602, carries out interference elimination according to being used for the interference cancellation matrix eliminating interlayer interference with this initial channel response information, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interference；

Step 603, the channel response information at resource particle place shared by the reference signal after disturbing based on elimination, estimate the channel response at resource particle place shared by downlink transmission data.

In the specific implementation, this interference cancellation matrix being used for eliminating interlayer interference can obtain based on experience value, it is also possible to generates according to the statistical property of transmission channel.Can be smoothed according to this interference cancellation matrix and this initial channel response information, for instance this interference cancellation matrix can be multiplied with this initial channel response information, it is thus achieved that eliminate the initial channel response information after interlayer interference.

In one embodiment, it is possible to carry out the demultiplexing based on time domain direction and despreading processes, and on frequency domain direction, carry out interference elimination.Such as, it was predicted that channel is linear in the change of frequency domain direction, then this interference cancellation matrix can be:

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

In another embodiment, it is possible to carry out the demultiplexing based on frequency domain direction and despreading processes, and on frequency domain direction, carry out interference elimination.Such as, it was predicted that channel is linear in the change of frequency domain direction, then this interference cancellation matrix can be:

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

In further embodiment, it is possible to carry out the demultiplexing based on frequency domain direction and despreading processes, and carry out interference elimination on time domain direction or frequency domain direction；Or carry out the demultiplexing based on time domain direction and despreading processes, and on frequency domain direction, carry out interference elimination；Or carry out the demultiplexing based on time domain and frequency domain direction and despreading processes, and in time domain and frequency domain direction, carry out interference elimination.

Embodiment 4

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

In the present embodiment, it is possible to generate interference cancellation matrix based on channel statistic.When statistical property according to transmission channel generates interference cancellation matrix, it is possible to use the initial channel response of UE DRS (Dedicated Reference Signal), or the initial channel response of use cell special reference, or 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 present invention, as it is shown in fig. 7, described channel estimation methods includes:

Step 701, utilizes the reference signal sequence previously generated to carry out to received signal demultiplexing and despreading process, to extract the initial channel response information at resource particle place shared by the reference signal in the downlink transfer layer being superimposed together.

Step 702, generates interference cancellation matrix according to the statistical property of transmission channel.

In the specific implementation, it is possible to based at least one in the signal to noise ratio of transmission channel, Doppler frequency shift or delay spread information, Minimum Mean Squared Error estimation is carried out to calculate interference cancellation matrix.

Step 703, carries out interference elimination according to being used for the interference cancellation matrix eliminating interlayer interference with this initial channel response information, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interference.

Step 704, the channel response information at resource particle place shared by the reference signal after disturbing based on elimination, estimate the channel response at resource particle place shared by downlink transmission data.

Fig. 8 is a schematic diagram of the channel estimation methods of the embodiment of the present invention, illustrates for UE DRS (Dedicated Reference Signal) again.As shown in Figure 8, (i, j, n, k l) first can pass through to demultiplex and de-spreading operation, obtain the initial signal response at UE DRS (Dedicated Reference Signal) resource particle place to receive signal rIt follows that interference cancellation matrix W can be generated according to the statistical property of transmission channel_LM.Then the initial channel response of interference cancellation matrix with UE DRS (Dedicated Reference Signal) resource particle place is multiplied, obtainsIt is finally based on the channel response at the UE DRS (Dedicated Reference Signal) resource particle place after interference eliminates, estimates the channel response at data message resource particle place.

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

By above-described embodiment it can be seen that carry out interference by the interference cancellation matrix and initial channel response information for eliminating interlayer interference and eliminate, it is possible to eliminate the interlayer interference comprised in reference signal initial channel response, improve precision and the systematic function of channel estimating.

The apparatus and method more than present invention can be realized by hardware, it is also possible to is realized by combination of hardware software.The present invention relates to such computer-readable program, when this program is performed by logical block, it is possible to make this logical block realize devices described above or component parts, or make this logical block realize various methods mentioned above or step.The invention still further relates to the storage medium for storing procedure above, such as hard disk, disk, CD, DVD, flash memory etc..

Above in association with specific embodiment, invention has been described, it will be appreciated by those skilled in the art that these descriptions are all illustrative of, is not limiting the scope of the invention.The present invention can be made various variants and modifications according to the spirit of the present invention and principle by those skilled in the art, and these variants and modifications are also within the scope of the invention.

About the embodiment including above example, following remarks is also disclosed:

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

Pretreatment unit, utilizes the reference signal sequence previously generated to carry out to received signal demultiplexing and despreading process, to extract the initial channel response information at resource particle place shared by the reference signal in the downlink transfer layer being superimposed together；

Interference cancellation unit, carries out interference according to the interference cancellation matrix and described initial channel response information for eliminating interlayer interference and eliminates, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interference；

Channel estimating unit, the channel response information at resource particle place shared by the reference signal after disturbing based on described elimination, estimate the channel response at resource particle place shared by downlink transmission data.

(remarks 2) channel estimating apparatus according to remarks 1, wherein, described channel estimating apparatus also includes:

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

(remarks 3) channel estimating apparatus according to remarks 1, wherein, described interference cancellation matrix previously generates based on experience value.

(remarks 4) channel estimating apparatus according to remarks 2, wherein, described matrix calculation unit specifically for: based at least one in the signal to noise ratio of described transmission channel, Doppler frequency shift or delay spread information, carry out Minimum Mean Squared Error estimation to calculate described interference cancellation matrix.

(remarks 5) channel estimating apparatus according to remarks 2, wherein, described matrix calculation unit uses the initial channel response of user equipment specific reference signal to be transmitted the estimation of channel statistic, or the initial channel response using cell special reference is transmitted the estimation of channel statistic, or uses the initial channel response of channel state information reference signals to be transmitted the estimation of channel statistic.

(remarks 6) channel estimating apparatus according to remarks 1, wherein, described pretreatment unit carries out the demultiplexing based on time domain direction and despreading processes, and described interference cancellation unit carries out interference on frequency domain direction and eliminates.

(remarks 7) channel estimating apparatus according to remarks 6, wherein, it was predicted that channel is linear in the change of frequency domain direction, 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 8) channel estimating apparatus according to remarks 1, wherein, described pretreatment unit carries out the demultiplexing based on frequency domain direction and despreading processes, and described interference cancellation unit carries out interference on frequency domain direction or time domain direction and eliminates.

(remarks 9) channel estimating apparatus according to remarks 7, wherein, it was predicted that channel is linear in the change of frequency domain direction, 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 10) channel estimating apparatus according to remarks 1, wherein, described pretreatment unit carries out the demultiplexing based on frequency domain direction and despreading processes, and described interference cancellation unit carries out interference on time domain direction or frequency domain direction and eliminates；Or, described pretreatment unit carries out the demultiplexing based on time domain direction and despreading processes, and described interference cancellation unit carries out interference on frequency domain direction and eliminates；Or, described pretreatment unit carries out the demultiplexing based on time domain and frequency domain direction and despreading processes, and described interference cancellation unit carries out interference in time domain and frequency domain direction and eliminates.

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

The reference signal sequence previously generated is utilized to carry out to received signal demultiplexing and despreading process, to extract the initial channel response information at resource particle place shared by the reference signal in the downlink transfer layer being superimposed together；

Carry out interference according to the interference cancellation matrix and described initial channel response information for eliminating interlayer interference to eliminate, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interference；

The channel response information at resource particle place shared by reference signal after disturbing based on described elimination, estimates the channel response at resource particle place shared by downlink transmission data.

(remarks 12) channel estimation methods according to remarks 11, wherein, described channel estimation methods also includes:

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

(remarks 13) channel estimation methods according to remarks 12, wherein, statistical property according to transmission channel generates described interference cancellation matrix and specifically includes: based at least one in the signal to noise ratio of described transmission channel, Doppler frequency shift or delay spread information, carry out Minimum Mean Squared Error estimation to calculate described interference cancellation matrix.

(remarks 14) channel estimation methods according to remarks 12, wherein, when statistical property according to transmission channel generates described interference cancellation matrix, the initial channel response using user equipment specific reference signal is transmitted the estimation of channel statistic, or the initial channel response using cell special reference is transmitted the estimation of channel statistic, or uses the initial channel response of channel state information reference signals to be transmitted the estimation of channel statistic.

(remarks 15) channel estimation methods according to remarks 11, wherein, carries out the demultiplexing based on time domain direction and despreading processes, and carry out interference elimination on frequency domain direction.

(remarks 16) channel estimation methods according to remarks 15, wherein, it was predicted that channel is linear in the change of frequency domain direction, 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) channel estimation methods according to remarks 11, wherein, carries out the demultiplexing based on frequency domain direction and despreading processes, and carry out interference elimination on frequency domain direction or time domain direction.

(remarks 18) channel estimation methods according to remarks 17, wherein, it was predicted that channel is linear in the change of frequency domain direction, 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) channel estimation methods according to remarks 11, wherein, carries out the demultiplexing based on frequency domain direction and despreading processes, and carry out interference elimination on time domain direction or time domain direction；Or carry out the demultiplexing based on time domain direction and despreading processes, and on frequency domain direction, carry out interference elimination；Or carry out the demultiplexing based on time domain and frequency domain direction and despreading processes, and in time domain and frequency domain direction, carry out interference elimination.

(remarks 20) a kind of subscriber equipment, described subscriber equipment includes the channel estimating apparatus as described in any one of remarks 1 to 10.

Claims (11)

1. a channel estimating apparatus, it is characterised in that described channel estimating apparatus includes:

Pretreatment unit, utilizes the reference signal sequence previously generated to carry out to received signal demultiplexing and despreading process, to extract the initial channel response information at resource particle place shared by the reference signal in the downlink transfer layer being superimposed together；

Interference cancellation unit, carries out interference according to the interference cancellation matrix and described initial channel response information for eliminating interlayer interference and eliminates, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interference；

Channel estimating unit, the channel response information at resource particle place shared by the reference signal after disturbing based on described elimination, estimate the channel response at resource particle place shared by downlink transmission data.

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

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 for: based at least one in the signal to noise ratio of described transmission channel, Doppler frequency shift or delay spread information, carry out Minimum Mean Squared Error estimation to calculate described interference cancellation matrix.

4. channel estimating apparatus according to claim 2, wherein, described matrix calculation unit uses the initial channel response of user equipment specific reference signal to be transmitted the estimation of channel statistic, or the initial channel response using cell special reference is transmitted the estimation of channel statistic, or uses the initial channel response of channel state information reference signals to be transmitted the estimation of channel statistic.

5. channel estimating apparatus according to claim 1, wherein, described pretreatment unit carries out the demultiplexing based on time domain direction and despreading processes, and described interference cancellation unit carries out interference on frequency domain direction and eliminates.

6. channel estimating apparatus according to claim 1, wherein, described pretreatment unit carries out the demultiplexing based on frequency domain direction and despreading processes, and described interference cancellation unit carries out interference on time domain direction or frequency domain direction and eliminates.

7. channel estimating apparatus according to claim 1, wherein, described pretreatment unit carries out the demultiplexing based on time domain and frequency domain direction and despreading processes, and described interference cancellation unit carries out interference in time domain and frequency domain direction and eliminates.

8. a channel estimation methods, it is characterised in that described channel estimation methods includes:

The reference signal sequence previously generated is utilized to carry out to received signal demultiplexing and despreading process, to extract the initial channel response information at resource particle place shared by the reference signal in the downlink transfer layer being superimposed together；

Carry out interference according to the interference cancellation matrix and described initial channel response information for eliminating interlayer interference to eliminate, it is thus achieved that eliminate the channel response information at resource particle place shared by the reference signal after interference；

The channel response information at resource particle place shared by reference signal after disturbing based on described elimination, estimates the channel response at resource particle place shared by downlink transmission data.

9. channel estimation methods according to claim 8, wherein, described channel estimation methods also includes:

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

10. channel estimation methods according to claim 9, wherein, statistical property according to transmission channel generates described interference cancellation matrix and specifically includes: based at least one in the signal to noise ratio of described transmission channel, Doppler frequency shift or delay spread information, carry out Minimum Mean Squared Error estimation to calculate described interference cancellation matrix.

11. a subscriber equipment, it is characterised in that described subscriber equipment includes the channel estimating apparatus as described in any one of claim 1 to 7.