CN103516639A - Channel estimation method, channel estimation device and receiver - Google Patents

Abstract

The embodiment of the invention discloses a channel estimation method, a channel estimation device and a receiver. The method comprises the steps that at least one second transmitting end with overlapping of the second transmitting end and resource blocks of a first transmitting end exceeding a set threshold is determined; a first channel response of the reference signal of the first transmitting end in a time domain is obtained, and a second channel response of the reference signal of the second transmitting end in a time domain is obtained; the power of the path of the second transmitting end in the time domain is obtained according to the second channel response, and the disturbance to the first transmitting end of the second transmitting end is determined according to the power of the path of the second transmitting end in the time domain; in the first channel response, the disturbance to the first transmitting end of the second transmitting end is removed. The purpose of reducing the disturbance among users is achieved, and the accuracy of channel estimation is improved.

Description

Channel estimation methods, channel estimating apparatus and receiver

Technical field

The present invention relates to mobile communication technology, relate in particular to a kind of channel estimation methods, channel estimating apparatus and receiver.

Background technology

Data are after transmitting terminal emits, and through the propagation arrival receiving terminal of wireless channel, the various disturbing factors in wireless channel can impact the data of transmitting, and therefore, the data that receiving terminal receives may differ widely with the data of transmitting terminal transmitting.Conventionally need to carry out channel estimating and carry out equilibrium treatment to receiving data, the impact that overcomes channel recovers data.At present, the known reference signal of transmitter and receiver in transmitted data signal conventionally, receiving terminal is estimated the channel response of reference signal experience according to the reference signal receiving and known reference signal, and then is obtained the channel response of data-signal.

In prior art, when the Resource Block (Resource Block, RB) that takies when a plurality of transmitting terminals is overlapping, between transmitting terminal, by reference to the orthogonalization of signal, reduces the interference of channel estimating, or by quasi orthogonal sequences, reduce the interference of channel estimating.Yet, due to the finiteness of orthogonal sequence, only can guarantee the transmitting terminal reference signal quadrature of limited quantity, therefore, still can make the channel estimating between part transmitting terminal have interference, affect the accuracy of channel estimating.

Summary of the invention

The embodiment of the present invention provides a kind of channel estimation methods, channel estimating apparatus and receiver, to reduce the interference between transmitting terminal, improves the accuracy of channel estimating.

On the one hand, the embodiment of the present invention provides a kind of channel estimation methods, comprising:

Determine overlapping at least one second transmitting terminal of setting thresholding that surpasses of Resource Block with the first transmitting terminal;

Obtain the first channel response in the reference signal time domain of described the first transmitting terminal, the second channel response of the reference signal of obtaining described the second transmitting terminal in time domain;

According to described second channel response, obtain the power in described the second transmitting terminal path in time domain, and according to the interference of the second transmitting terminal to described the first transmitting terminal described in the power determination in described the second transmitting terminal path in time domain;

In described the first channel response, remove the interference of described the second transmitting terminal to described the first transmitting terminal.

On the other hand, the embodiment of the present invention also provides a kind of channel estimating apparatus, comprising:

First processor, for overlapping at least one second transmitting terminal of setting thresholding that surpasses of Resource Block definite and the first transmitting terminal;

Channel estimator, for obtaining the first channel response in the reference signal time domain of described the first transmitting terminal, the second channel response of the reference signal of obtaining described the second transmitting terminal in time domain;

Described first processor also for: according to described second channel, the power in described the second transmitting terminal path in time domain is obtained in response, and according to the interference of the second transmitting terminal to described the first transmitting terminal described in the power determination in described the second transmitting terminal path in time domain, in described the first channel response, remove the interference of described the second transmitting terminal to described the first transmitting terminal.

The embodiment of the present invention also provides a kind of receiver, comprising: receiver, the second processor, demodulator and channel estimating apparatus;

Described receiver, the reference signal and the data-signal that for receiving the first transmitting terminal, send, and receive reference signal and the data-signal that at least one second transmitting terminal sends;

Described channel estimating apparatus, for determining and the overlapping transmitting terminal set that surpasses setting thresholding of Resource Block of the first transmitting terminal, described transmitting terminal set comprises at least one second transmitting terminal; The reference signal of described the first transmitting terminal is carried out to channel estimating, first channel response of the reference signal of obtaining described the first transmitting terminal in time domain, reference signal to the second transmitting terminal described in each is carried out channel estimating, the second channel response of the reference signal of obtaining the second transmitting terminal described in each in time domain; According to described second channel, response is obtained described in each the second transmitting terminal at the power in time domain Nei Ge path, and according to the second transmitting terminal described in each in the interference of the second transmitting terminal to described the first transmitting terminal described in each of the power determination in time domain Nei Ge path; In described the first channel response, remove the interference of the second transmitting terminal to described the first transmitting terminal described in each;

Described the second processor, for the first channel response of removing interference that described channel estimating apparatus is obtained, transform to frequency domain, obtain reference signal that the first transmitting terminal sends the 4th channel response in frequency domain, and described the 4th channel response is carried out to the channel response that interpolation obtains the data-signal that the first transmitting terminal sends;

Described demodulator, the data-signal sending for described the first transmitting terminal described receiver being received according to the channel response of the data-signal of described the first transmitting terminal transmission carries out demodulation.

The embodiment of the present invention provides a kind of channel estimation methods, channel estimating apparatus and receiver, first determine the overlapping transmitting terminal set that surpasses setting thresholding of Resource Block with the first transmitting terminal, according to each path power in time domain of each transmitting terminal in transmitting terminal set, determine again the interference of the channel response in time domain to the first transmitting terminal, and the interference of removing the transmitting terminal in transmitting terminal set at the first transmitting terminal in the channel response in time domain, thereby realize the interference reducing between transmitting terminal, improve the accuracy of channel estimating.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the flow chart of an embodiment of channel estimation methods provided by the invention;

The schematic diagram of definite transmitting terminal set that Fig. 2 provides for the embodiment of the present invention;

Fig. 3 is the flow chart of another embodiment of channel estimation methods provided by the invention;

Fig. 4 is that the channel response of reference signal of a plurality of transmitting terminals provided by the invention is at the interactional schematic diagram in time domain Nei path;

Fig. 5 is the time delay in time domain Nei Ge path and the corresponding relation schematic diagram of power in channel estimation methods provided by the invention;

Fig. 6 is the structural representation of an embodiment of channel estimating apparatus provided by the invention;

Fig. 7 is the structural representation of an embodiment of receiver provided by the invention.

Embodiment

For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

The channel estimation methods that the embodiment of the present invention provides, can be for estimating up channel or down channel.Specifically can be carried out by the receiving terminal of reference signal.For example, in up channel, receiving terminal may be received in the reference signal sending in up channel.If in up channel, the transmitting terminal of reference signal is user terminal, and receiving terminal can be base station, or is relay station; If the transmitting terminal of reference signal is relay station, receiving terminal can be base station or upper hop relay station.In down channel, receiving terminal may be received in the reference signal sending in down channel, if the transmitting terminal of reference signal is base station, receiving terminal can be terminal or relay station; If the transmitting terminal of reference signal is relay station, receiving terminal can be terminal or down hop relay station.

The reference signal relating in the embodiment of the present invention, also can be called pilot signal.

Fig. 1 is the flow chart of an embodiment of channel estimation methods provided by the invention, and as shown in Figure 1, the executive agent of following steps is receiving terminal.The method comprises:

S101, overlapping at least one second transmitting terminal of setting thresholding that surpasses of Resource Block definite and the first transmitting terminal.

In up channel, the first transmitting terminal or the second transmitting terminal can be user terminal or relay station; In down channel, the first transmitting terminal or the second transmitting terminal can be base station or relay station.The first transmitting terminal relating in the application, can refer to expectation transmitting terminal, expectation obtains the first transmitting terminal and eliminates the channel response after other transmitting terminals disturb, and receiving terminal need to adopt channel estimation methods provided by the invention to determine the channel response of the reference signal that the first transmitting terminal sends.

The first transmitting terminal can take one or more RB Resource Block, equally, the second transmitting terminal also can take one or more Resource Block, overlapping the referring to of Resource Block relating in the embodiment of the present invention, and the first transmitting terminal and the second transmitting terminal take identical one or more RB Resource Block.Because the RB resource between transmitting terminal overlaps more, the channel response of the reference signal of transmitting terminal is estimated to impact is larger, and therefore, receiving terminal can be set threshold value, this threshold value is RB resource thresholding, specifically can adopt certain RB Resource Block number as setting threshold value.Receiving terminal can judge the overlapping m of surpassing of RB resource with the first transmitting terminal _rBat least one of individual RB the second transmitting terminal.Wherein, thresholding m _rBcan set according to real needs, for instance, can determine according to the situation that affects that generally the RB resource coincidence situation between transmitting terminal is estimated the channel response of reference signal, for example: m _rBcan equal 1 RB.

As shown in Figure 2, for the transmitting terminal 1 as the first transmitting terminal, transmitting terminal 2 is set thresholding with overlapping the surpassing of Resource Block of transmitting terminal 1, determines that transmitting terminal 2 is the second transmitting terminal; Transmitting terminal 3 is not set thresholding with overlapping the surpassing of Resource Block of transmitting terminal 1, determines that transmitting terminal 3 is not the second transmitting terminal.

S102, obtain the first channel response in the reference signal time domain of the first transmitting terminal, the second channel response of the reference signal of obtaining the second transmitting terminal in time domain.

First receiving terminal can carry out channel estimating to receiving the reference signal of the first transmitting terminal, the channel response of the reference signal of obtaining the first transmitting terminal in frequency domain, again this channel response is transformed to time domain, the channel response of the reference signal that obtains the first transmitting terminal in time domain, this channel response is called the first channel response.

For example, the reference signal of a transmitting antenna supposing the first transmitting terminal on OFDM (Orthogonal Frequency Division Multiplexing, OFDM) symbol is:

P＝[P(0)P(1)…P(M-1)]

Wherein, M is the quantity of reference signal on this OFDM symbol, that is, M represents the sequence length of reference signal, and M is greater than 0 integer; P (M-1) represents the value of M reference signal, from the transmitting antenna of transmitting terminal, to the channel response the reception antenna of receiving terminal, is H ^r, noise is N ^r, the sequence number that r is reception antenna, r=0,1 ..., R-1, the sum that R is reception antenna.

The reference signal that reception antenna of receiving terminal receives is:

Y ^r＝H ^rP+N ^r

The reference signal that receiving terminal can adopt existing the whole bag of tricks to send the first transmitting terminal is carried out channel estimating, obtains the channel response of reference signal.

For instance, receiving terminal can carry out least square (Ieast Square, LS) channel estimating to the reference signal receiving, and obtains the channel response of the reference signal of reception antenna r

in embodiments of the present invention, the method that the reference signal that the first transmitting terminal that docking is received to receiving terminal sends is carried out channel estimating does not limit.

This channel response

for the channel response of reference signal in frequency domain, the channel response of the reference signal that receiving terminal can further send the first transmitting terminal in frequency domain transforms to time domain, obtain reference signal that the first transmitting terminal the sends channel response in time domain, i.e. the first channel response.

For instance, the channel response of the reference signal that can send the first transmitting terminal in frequency domain carries out inverse Fourier transform, obtains the first channel response h ^r(n), n=0,1 ..., N _iFFT-1.Wherein, what inverse fast Fourier transform (Inverse Fast Fourier Transform, IFFT) was inverse Fourier transform counts, $N_{\mathrm{IFFT}}=2^{\mathrm{ceil}\left[{\log }_2\left(M\right)\right]},$ Ceil represents upwards to ask whole.

It should be noted that, because the IFFT that counts of inverse Fourier transform is 2 n power (n is more than or equal to 0 integer), therefore, if the data length of the channel response of the reference signal that the first transmitting terminal sends in frequency domain cannot meet the demand of the IFFT that counts of inverse Fourier transform, channel response that can be in frequency domain

after mend N _iFFT-M zero, mends the channel response after 0

note is done

to this channel response

carrying out inverse Fourier transform carries out according to following formula:

$h^r=\mathrm{IFFT}\left({\tilde{H}}_{\mathrm{LS}}^r\right).$

Be more than the process that receiving terminal obtains reference signal that the first transmitting terminal sends the first channel response in time domain, similarly, receiving terminal is adopted can obtain transmitting terminal set η in the same way _iin the response of the second channel of each second transmitting terminal in time domain

wherein, n=0,1 ..., N _iFFT-1, j ∈ η _i.

It should be noted that, channel response in the reference signal that each second transmitting terminal is sent in frequency domain transforms in the process of time domain, the inverse Fourier transform of carrying out can the IFFT length that the channel response in frequency domain transforms in time domain process according to the reference signal of the first transmitting terminal of the channel response in frequency domain transform to time domain by the reference signal with the first transmitting terminal RB resource overlapping region, the channel response of the reference signal of the underlapped frequency domain of RB resource mends 0, forms second channel response

$h_j^r=\mathrm{IFFT}\left({\tilde{H}}_{\mathrm{LS},j}^r\right)$

S103, according to second channel response, obtain the power in the second transmitting terminal path in time domain, and the interference to the first transmitting terminal according to power determination second transmitting terminal in the second transmitting terminal path in time domain.

Each second transmitting terminal each path power in time domain can be each antenna power sum of this second transmitting terminal, can be also the power average value of each antenna of this second transmitting terminal.Can basis

determine, wherein, n=0,1 ..., N _iFFT-1.Wherein, counting of the inverse Fourier transform that IFFT carries out in time domain for reference signal that the second transmitting terminal the is sent channel response in frequency domain transforms to, the corresponding time domain Nei Yige of each n path, time domain Nei path refers to, reference signal arrives through reflection and/or refraction the path that receiving terminal is passed by from the second transmitting terminal, and in time domain, different paths is distinguished by the time delay in path.

Due to the annoyance level of each second transmitting terminal to the first channel response of the first transmitting terminal, relevant in the watt level in time domain Nei Ge path with each second transmitting terminal, high-power path is disturbed larger conventionally, power little path is disturbed less conventionally, therefore, receiving terminal can be according to each second transmitting terminal the power in time domain Nei Ge path, determine each the second transmitting terminal interference to the first channel response.

As a kind of feasible execution mode, receiving terminal can obtain the interference to the first channel response at the power in time domain Nei Ge path of each second transmitting terminal successively; Or, as the feasible execution mode of another kind, receiving terminal can also be chosen the larger several paths of power in each second transmitting terminal, the interference of the power of determining these paths to the first transmitting terminal, and negligible to the interference of the first channel response to lower-powered time domain Nei path.

For instance, can adopt the power in each path and the mode of reference signal sequence convolution to determine the interference of each path of the second transmitting terminal to the first transmitting terminal, can also adopt existing the whole bag of tricks, the interference by the power determination in second each path of transmitting terminal to the first transmitting terminal.

Above are only the power in time domain Nei Ge path according to each the second transmitting terminal, determine a kind of feasible execution mode of each transmitting terminal to the interference of the first channel response, be understandable that, can also adopt existing the whole bag of tricks to determine the interference to the first channel response of each transmitting terminal in transmitting terminal set.

S104, in the first channel response, remove the interference of the second transmitting terminal to the first transmitting terminal.

Obtain each second transmitting terminal to the interference of the first channel response after, in first channel response of the reference signal that can send at the first transmitting terminal in time domain, remove each the second transmitting terminal interference to the first channel response, obtain reference signal that the first transmitting terminal the sends channel response in time domain.

It should be noted that, to each second transmitting terminal, also there is interference in the first transmitting terminal,, determine in each the second transmitting terminal second channel that each path power adopts in time domain response and also comprised the interference of the first transmitting terminal to the second transmitting terminal, in order to improve accuracy, optionally, receiving terminal can obtain the first transmitting terminal at the power in time domain Nei Ge path according to the first channel response, and the interference to each the second transmitting terminal at power determination first transmitting terminal in time domain Nei Ge path according to the first transmitting terminal.In second channel response corresponding to each the second transmitting terminal, remove the interference of the first transmitting terminal to this second transmitting terminal, obtain the 3rd channel response that each second transmitting terminal is corresponding.According to removing the 3rd channel response obtaining after interference, obtain each second transmitting terminal at the power in time domain Nei Ge path again, and each the second transmitting terminal interference to the first transmitting terminal of power determination in time domain Nei Ge path according to each second transmitting terminal.

After the channel response of the reference signal that the first transmitting terminal that obtains remove disturbing sends in time domain, receiving terminal can transform to frequency domain by this channel response, obtains reference signal that the first transmitting terminal the sends channel response in frequency domain.Receiving terminal can obtain according to the channel response of the reference signal of the first transmitting terminal the channel response of data-signal conventionally.For example, the reference signal that receiving terminal can send according to the first transmitting terminal and the position of data-signal, the channel response to reference signal in frequency domain carries out interpolation, obtains the channel response of data-signal.And then can utilize the channel response of data-signal to carry out equalizing demodulation processing to the data-signal receiving.

The present embodiment provides a kind of channel estimation methods, first determine the overlapping transmitting terminal set that surpasses setting thresholding of Resource Block with the first transmitting terminal, according to each path power in time domain of each transmitting terminal in transmitting terminal set, determine again the interference of the channel response in time domain to the first transmitting terminal, and the interference of removing the transmitting terminal in transmitting terminal set at the first transmitting terminal in the channel response in time domain, thereby realize the interference reducing between transmitting terminal, improve the accuracy of channel estimating.

Fig. 3 is the flow chart of another embodiment of channel estimation methods provided by the invention, as shown in Figure 3, in the present embodiment, provide: obtain the overlapping process of each second transmitting terminal to the interference of the first channel response of the first transmitting terminal of setting thresholding that surpass of RB resource with the first transmitting terminal.

The method comprises:

S301, overlapping at least one second transmitting terminal of setting thresholding that surpasses of Resource Block definite and the first transmitting terminal.

S302, obtain the first channel response in the reference signal time domain of the first transmitting terminal, the second channel response of the reference signal of obtaining the second transmitting terminal in time domain.

The process of S301 and S302 can be in no particular order, and the S101 of detailed process in can embodiment shown in Figure 1 and the associated description of S102, do not repeat them here.

S303, according to the response of the first channel response and second channel, determine power maximum, power maximum is that the first transmitting terminal is in power and the maximum of the second transmitting terminal in the power in time domain Nei Ge path in time domain Nei Ge path.

As a kind of feasible execution mode, can

According to $h_x\left(\mathrm{tap}\right)=\underset{j\∈{\mathrm{\μ}}_i}{\max }\left\{\underset{n=0...N_{\mathrm{IFFT}}-1}{\max }\right\{\underset{r=0...R-1}{\mathrm{\Σ}}{\left|h_j^r\left(n\right)\right|}^2\left\}\right\},$ Determine the maximum of the first transmitting terminal in the power in time domain Nei Ge path, or the maximum of the second transmitting terminal in the power in time domain Nei Ge path;

In maximum from the first transmitting terminal the power in time domain Nei Ge path and the maximum of the second transmitting terminal in the power in time domain Nei Ge path, determine power maximum;

Wherein,

be the first channel response that the first transmitting terminal j is corresponding, r is the antenna sequence number of the first transmitting terminal j, and R is the antenna sum of the first transmitting terminal j, N _iFFTfor obtaining counting of the inverse Fourier transform of carrying out in the first channel response process, η _ibe the first transmitting terminal, x represents the first transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the first transmitting terminal x in time domain; Or,

be the second channel response that the second transmitting terminal j is corresponding, r is the antenna sequence number of the second transmitting terminal j, and R is the antenna sum of the second transmitting terminal j, N _iFFTfor obtaining counting of the inverse Fourier transform of carrying out in second channel response process, η _ifor the set that whole the second transmitting terminals form, x represents the second transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the second transmitting terminal x in time domain.

S304, determine the interference of path corresponding to power maximum to other transmitting terminals.

Wherein, when the path of corresponding the first transmitting terminal of power maximum, the interference of the path of determining the first transmitting terminal that power maximum is corresponding to each the second transmitting terminal; When the path of corresponding a certain the second transmitting terminal of power maximum, the interference of the path of determining the second transmitting terminal that power maximum is corresponding to the first transmitting terminal, and the interference to other the second transmitting terminals except this second transmitting terminal.

As a kind of feasible execution mode, can be according to I _j=h _x(tap) * IFFT (S _x/ S _j), I _j=(I _j> > (tap)), determine the interference of path corresponding to power maximum to the first transmitting terminal;

Wherein, x represents the second transmitting terminal that power maximum is corresponding, and tap represents the tapGe footpath of the second transmitting terminal x in time domain, j ≠ x, S _xthe reference signal sequence that represents the second transmitting terminal x, S _jrepresent the reference signal sequence of the first transmitting terminal j or the reference signal sequence of the second transmitting terminal except the second transmitting terminal corresponding to power maximum, h _x(tap) be the channel response of power maximum respective path.

Similarly, also can be according to I _j=h _x(tap) * IFFT (S _x/ S _j), I _j=(I _j> > (tap)), determine the interference of path corresponding to power maximum to the second transmitting terminal; Wherein, x represents the first transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the first transmitting terminal x in time domain, j ≠ x, S _xthe reference signal sequence that represents the first transmitting terminal x, S _jthe reference signal sequence that represents the first transmitting terminal j, h _x(tap) be the channel response of power maximum respective path.

As shown in Figure 4, transmitting terminal 1 is the first transmitting terminal, and transmitting terminal 2 and transmitting terminal 3 are the second transmitting terminal.First receiving terminal judges that emergent power is peaked for second path of transmitting terminal 2 in time domain,, tap=1 (value of tap is since 0), receiving terminal can be determined the interference of second path of transmitting terminal 2 in time domain to transmitting terminal 1, can also determine the interference of second path of transmitting terminal 2 in time domain to transmitting terminal 3.Receiving terminal can be determined has the complete or collected works η of second path of the peaked transmitting terminal 2 of power in time domain to the first transmitting terminal and transmitting terminal set _iin the interference of other transmitting terminals except itself.Can find out I _j=h _x(tap) * IFFT (S _x/ S _j) can be for determining the interference of arbitrary transmitting terminal to other transmitting terminals except self, I _j=(I _j" (tap)) represent I _jright cyclic shift tap position, tap is since 0.

S305, the interference of the removal peaked path of power to other transmitting terminals.

If the peaked path of power is the path of the second transmitting terminal, can in the first channel response, remove the interference of path corresponding to power maximum to the first transmitting terminal.

Optionally, first channel response of the channel response that can obtain after disturbing in the first channel response in a, will re-execute S303-S305 after the channel response zero setting of the power maximum respective path in S303; During second channel corresponding to each the second transmitting terminal the second transmitting terminal corresponding except power maximum responds, the interference of the path of the second transmitting terminal that removal power maximum is corresponding to this second transmitting terminal, the second channel response using the channel response obtaining in S303.

That is, h _j=h _j-I _j, wherein, h _jfor the first channel response of the first transmitting terminal of being disturbed, I _jfor the interference to the first transmitting terminal of the path of the second transmitting terminal corresponding to power maximum; Equally, h _jalso can be the second channel response of the second transmitting terminal of being disturbed, I _jfor the interference to this second transmitting terminal of the path of the first transmitting terminal corresponding to power maximum.

When the path of corresponding the first transmitting terminal of power maximum, can in second channel response corresponding to each the second transmitting terminal, remove the interference of the peaked path of power to this second transmitting terminal, the second channel response using the channel response obtaining in S303.

S306, record be each carry out S303 the channel response of definite power maximum respective path.

peak _x(tap)＝peak _x(tap)+h _x(tap)

Peak _x(tap) be the channel response of the determined power maximum of the each execution S303 respective path of record.

After the channel response of S307, power maximum respective path that S303 is obtained sets to 0, re-execute S303, until reach to set, carry out number of times.

That is, by the channel response h of the determined power maximum of S303 respective path _x(tap)=0, then return and carry out S303.

Wherein, the process of S303-S307 can be carried out set point number, the number of times of carrying out can be according to the influence degree of the channel response of the reference signal that generally power in each path of arbitrary transmitting terminal sends other transmitting terminals etc. for example, because usually determining: can select to carry out 20 times.

S308, at the first transmitting terminal, at the power in time domain Nei Ge path and each the second transmitting terminal, in the power in time domain Nei Ge path, recover to carry out the channel response of the power maximum respective path that S303 set to 0 at every turn.

Can recover by the channel response h of the power maximum respective path of zero setting _x=h _x+ pea _k, to carry out other operations.

Be understandable that, can adopt the step of S302-S308 to determine the suffered interference of other expectation transmitting terminals, do not repeat them here.

The maximum delay scope in S309, measurement time domain Nei Ge path.

When the time delay in path arrives certain value in time domain, illustrate that the interference noise on this path is comparatively strong, cannot transmit useful reference signal, accordingly, can in the process of the reference signal of the first transmitting terminal transmission being carried out to channel estimating, carry out noise reduction process.Receiving terminal can adopt existing the whole bag of tricks to measure the power in time domain Nei Ge path, for example: can set certain power threshold, performance number can be defined as to maximum delay scope lower than time delay scope corresponding to path of setting threshold value.As shown in Figure 5, abscissa is the time delay in time domain Nei Ge path, and ordinate is the power in time domain Nei Ge path, and the maximum delay scope measuring is at τ _aand τ _bbetween, wherein, τ _a>=0, τ _b>=0, and τ _a≤ τ _b.

S310, in the first channel response remove disturbing, remove the channel response in all paths corresponding to maximum delay scope.

For the channel response of reference signal that the first transmitting terminal is sent carries out noise reduction process, can be in removing the first channel response disturbing the channel response in all paths corresponding to maximum delay scope be set to 0, that is:

h ^r(n)＝0 τ _a＜n＜τ _b

If the reference signal that S311 the first transmitting terminal sends is discontinuously arranged on frequency domain,, in removing the first channel response disturbing, within the scope of maximum delay, supplement (A-1) * N _iFFTindividual zero, wherein, A represents that A subcarrier has 1 reference signal, and A is greater than 0 integer, N _iFFTfor reference signal that the first transmitting terminal the is sent channel response in frequency domain transforms to counting of Fourier transform that time domain carries out.

Concrete: for example, if the reference signal on frequency domain is not continuous distribution: A subcarrier have 1 reference signal (A=1,2,3 ...), reference signal and total subcarrier ratio are 1/A.Need to be interpolated into A*N in time domain _iFFT, at h ^r(n) n=τ _a～τ _bbetween supplement (A-1) * N _iFFTindividual zero, obtain

l=0,1 ..., A*N _iFFT.By supplement (A-1) * N within the scope of maximum delay _iFFTindividual zero, can realize domain channel response is carried out to interpolation.

S312, the channel response obtaining of removing after the channel response in all paths corresponding to maximum delay scope is transformed to frequency domain, obtain reference signal that the first transmitting terminal the sends channel response in frequency domain.

Concrete, the time domain channel after noise reduction zero padding can be transformed to frequency domain, further, the channel response of the reference signal that can send the first transmitting terminal in frequency domain carries out interpolation, before intercepting

individual value, $\hat{M}=A*M.$

$H^r=\mathrm{FFT}\left({\hat{h}}^r\right)$

${\tilde{H}}^r=H^r(0~\hat{M})$

Further, receiving terminal can also send the position of reference signal and data-signal according to the first transmitting terminal, right

carry out interpolation and obtain the channel response of data-signal, and then can utilize the channel response of data-signal to carry out equalizing demodulation processing to the data-signal receiving.

The channel estimation methods that the present embodiment provides, first determine the overlapping transmitting terminal set that surpasses setting thresholding of Resource Block with the first transmitting terminal, according to each path power in time domain of each transmitting terminal in transmitting terminal set, determine again the interference of the channel response in time domain to the first transmitting terminal, and the interference of removing the transmitting terminal in transmitting terminal set at the first transmitting terminal in the channel response in time domain, thereby realize the interference reducing between transmitting terminal, improve the accuracy of channel estimating.

Fig. 6 is the structural representation of an embodiment of channel estimating apparatus provided by the invention, and as shown in Figure 6, this channel estimating apparatus comprises: first processor 11 and channel estimator 12;

First processor 11, for overlapping at least one second transmitting terminal of setting thresholding that surpasses of Resource Block definite and the first transmitting terminal;

Channel estimator 12, for obtaining the first channel response in the reference signal time domain of the first transmitting terminal, the second channel response of the reference signal of obtaining the second transmitting terminal in time domain;

First processor 11 is also for the power that obtains the second transmitting terminal path in time domain according to second channel response, and the interference to the first transmitting terminal according to power determination second transmitting terminal in the second transmitting terminal path in time domain, in the first channel response, remove the interference of the second transmitting terminal to the first transmitting terminal.

Optionally, first processor 11 can be specifically for: according to the first channel response, obtain the power in the first transmitting terminal path in time domain, and the interference to the second transmitting terminal according to power determination first transmitting terminal in the first transmitting terminal path in time domain; In second channel response corresponding to the second transmitting terminal, remove the interference of the first transmitting terminal to the second transmitting terminal, obtain the 3rd channel response; According to the 3rd channel response, obtain the power in the second transmitting terminal path in time domain, and the interference to the first transmitting terminal according to power determination second transmitting terminal in the second transmitting terminal path in time domain.。

Optionally, first processor can be specifically for: a, according to the first channel response and second channel response, determine power maximum, power maximum is that the first transmitting terminal is in power and the maximum of the second transmitting terminal in the power in time domain Nei Ge path in time domain Nei Ge path; If b power maximum is the path of the second transmitting terminal, determine the interference of path corresponding to power maximum to the first transmitting terminal; C, in the first channel response, remove the interference of path corresponding to power maximum to the first transmitting terminal.。

Optionally, first processor 11 can also be for: the first channel response using the channel response obtaining after the first channel response disturbs in a, will re-execute a, b and c after the channel response zero setting of the power maximum respective path in a; During second channel corresponding to each the second transmitting terminal the second transmitting terminal corresponding except power maximum responds, the interference of the path of the second transmitting terminal that removal power maximum is corresponding to this second transmitting terminal, second channel response using the channel response obtaining in a, to after the channel response zero setting of the power maximum respective path in a, re-execute a, b and c, until reach the set point number that circulation is carried out.

Optionally, first processor 11 can also be specifically for: after carrying out a, if b2 power maximum is the path of the first transmitting terminal, determine the interference of path corresponding to power maximum to the second transmitting terminal; C2, in second channel response, remove the interference of path corresponding to power maximum to the second transmitting terminal, second channel response using the channel response obtaining in a, to after the channel response zero setting of the power maximum respective path in a, re-execute a, b and c, until reach to set, carry out number of times.

Optionally, first processor 11 can be specifically for: according to $h_x\left(\mathrm{tap}\right)=\underset{j\∈{\mathrm{\μ}}_i}{\max }\left\{\underset{n=0...N_{\mathrm{IFFT}}-1}{\max }\right\{\underset{r=0...R-1}{\mathrm{\Σ}}{\left|h_j^r\left(n\right)\right|}^2\left\}\right\},$ Determine the maximum of the first transmitting terminal in the power in time domain Nei Ge path, or the maximum of the second transmitting terminal in the power in time domain Nei Ge path; In maximum from the first transmitting terminal the power in time domain Nei Ge path and the maximum of the second transmitting terminal in the power in time domain Nei Ge path, determine power maximum; Wherein,

be the first channel response that the first transmitting terminal j is corresponding, r is the antenna sequence number of the first transmitting terminal j, and R is the antenna sum of the first transmitting terminal j, N _iFFTfor obtaining counting of the inverse Fourier transform of carrying out in the first channel response process, η _ibe the first transmitting terminal, x represents the first transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the first transmitting terminal x in time domain; Or,

be the second channel response that the second transmitting terminal j is corresponding, r is the antenna sequence number of the second transmitting terminal j, and R is the antenna sum of the second transmitting terminal j, N _iFFTfor obtaining counting of the inverse Fourier transform of carrying out in second channel response process, η _ifor the set that whole the second transmitting terminals form, x represents the second transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the second transmitting terminal x in time domain.

Optionally, first processor 11 can also be specifically for: according to I _j=h _x(tap) * IFFT (S _x/ S _j), I _j=(I _j> > (tap)), determine the interference of path corresponding to power maximum to the first transmitting terminal; Wherein, x represents the second transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the second transmitting terminal x in time domain, j ≠ x, S _xthe reference signal sequence that represents the second transmitting terminal x, S _jthe reference signal sequence that represents the first transmitting terminal j, h _x(tap) be the channel response of power maximum respective path.

Optionally, first processor 11 can also be specifically for: according to I _j=h _x(tap) * IFFT (S _x/ S _j), I _j=(I _j> > (tap)), determine the interference of path corresponding to power maximum to the second transmitting terminal; Wherein, x represents the first transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the first transmitting terminal x in time domain, j ≠ x, S _xthe reference signal sequence that represents the first transmitting terminal x, S _jthe reference signal sequence that represents the first transmitting terminal j, h _x(tap) be the channel response of power maximum respective path.

The channel estimating apparatus that the present embodiment provides, corresponding with channel estimation methods provided by the invention, be the actuating equipment of channel estimation methods, its detailed process of carrying out channel estimation methods can, referring to the embodiment of the method shown in Fig. 1-Fig. 5, not repeat them here.

The channel estimating apparatus that the present embodiment provides, first determine the overlapping transmitting terminal set that surpasses setting thresholding of Resource Block with the first transmitting terminal, according to each path power in time domain of each transmitting terminal in transmitting terminal set, determine again the interference of the channel response in time domain to the first transmitting terminal, and the interference of removing the transmitting terminal in transmitting terminal set at the first transmitting terminal in the channel response in time domain, thereby realize the interference reducing between transmitting terminal, improve the accuracy of channel estimating.

Fig. 7 is the structural representation of an embodiment of receiver provided by the invention, and as shown in Figure 7, this receiver can comprise: receiver 1, channel estimating apparatus 2, the second processor 3 and demodulator 4; Wherein:

Receiver 1, the reference signal and the data-signal that for receiving the first transmitting terminal, send, and receive reference signal and the data-signal that at least one second transmitting terminal sends;

Channel estimating apparatus 2, for overlapping at least one second transmitting terminal of setting thresholding that surpasses of Resource Block definite and the first transmitting terminal; Obtain the first channel response in the reference signal time domain of the first transmitting terminal, the second channel response of the reference signal of obtaining the second transmitting terminal in time domain; According to second channel, the power in the second transmitting terminal path in time domain is obtained in response, and the interference to the first transmitting terminal according to power determination second transmitting terminal in the second transmitting terminal path in time domain; In the first channel response, remove the interference of the second transmitting terminal to the first transmitting terminal;

The second processor 3, for the first channel response of removing interference that channel estimating apparatus is obtained, transform to frequency domain, obtain reference signal that the first transmitting terminal sends the 4th channel response in frequency domain, and the 4th channel response is carried out to the channel response that interpolation obtains the data-signal that the first transmitting terminal sends;

Demodulator 4, the data-signal sending for the first transmitting terminal receiver being received according to the channel response of the data-signal of the first transmitting terminal transmission carries out demodulation.

The receiver that the present embodiment provides, can be arranged on end side, also can be arranged on base station side, can also be arranged on relay station.The channel estimating apparatus wherein relating to is corresponding with channel estimation methods provided by the invention, is the actuating equipment of channel estimation methods, and the embodiment of the method that its detailed process of carrying out channel estimation methods can be shown in Figure 3, does not repeat them here.

The receiver that the present embodiment provides, first determine the overlapping transmitting terminal set that surpasses setting thresholding of Resource Block with the first transmitting terminal, according to each path power in time domain of each transmitting terminal in transmitting terminal set, determine again the interference of the channel response in time domain to the first transmitting terminal, and the interference of removing the transmitting terminal in transmitting terminal set at the first transmitting terminal in the channel response in time domain, thereby realize the interference reducing between transmitting terminal, improve the accuracy of channel estimating.

One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can complete by the relevant hardware of program command.Aforesaid program can be stored in a computer read/write memory medium.This program, when carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.

Finally it should be noted that: each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit above; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.

Claims (17)

1. a channel estimation methods, is characterized in that, comprising:

Determine overlapping at least one second transmitting terminal of setting thresholding that surpasses of Resource Block with the first transmitting terminal;

Obtain the first channel response in the reference signal time domain of described the first transmitting terminal, the second channel response of the reference signal of obtaining described the second transmitting terminal in time domain;

According to described second channel response, obtain the power in described the second transmitting terminal path in time domain, and according to the interference of the second transmitting terminal to described the first transmitting terminal described in the power determination in described the second transmitting terminal path in time domain;

In described the first channel response, remove the interference of described the second transmitting terminal to described the first transmitting terminal.

2. method according to claim 1, it is characterized in that, the described power that obtains described the second transmitting terminal path in time domain that responds according to described second channel, and according to the interference of the second transmitting terminal to described the first transmitting terminal described in the power determination in described the second transmitting terminal path in time domain, comprising:

According to described the first channel response, obtain the power in described the first transmitting terminal path in time domain, and according to the interference of the first transmitting terminal to described the second transmitting terminal described in the power determination in described the first transmitting terminal path in time domain;

In second channel response corresponding to described the second transmitting terminal, remove the interference of described the first transmitting terminal to described the second transmitting terminal, obtain the 3rd channel response;

According to described the 3rd channel response, obtain the power in described the second transmitting terminal path in time domain, and according to the interference of the second transmitting terminal to described the first transmitting terminal described in the power determination in described the second transmitting terminal path in time domain.

3. method according to claim 1 and 2, it is characterized in that, the described power that obtains described the second transmitting terminal path in time domain that responds according to described second channel, and according to the interference of the second transmitting terminal to described the first transmitting terminal described in the power determination in described the second transmitting terminal path in time domain, comprising:

A, according to the response of described the first channel response and described second channel, determine power maximum, described power maximum is that described the first transmitting terminal is in power and the maximum of described the second transmitting terminal in the power in time domain Nei Ge path in time domain Nei Ge path;

If the path that the described power maximum of b1 is the second transmitting terminal, determines that path corresponding to described power maximum is to the interference of described the first transmitting terminal and the interference to each the second transmitting terminal except the second transmitting terminal corresponding to described power maximum;

C1, in described the first channel response, remove the interference of path corresponding to described power maximum to described the first transmitting terminal.

4. method according to claim 3, is characterized in that, described in described the first channel response, remove path corresponding to described power maximum to the interference of described the first transmitting terminal after, also comprise:

First channel response of the channel response obtaining after disturbing in described the first channel response in described a, will re-execute a, b and c after the channel response zero setting of the power maximum respective path in described a; In second channel response corresponding to each the second transmitting terminal except the second transmitting terminal corresponding to described power maximum, the interference of the path of removing the second transmitting terminal corresponding to described power maximum to this second transmitting terminal, second channel response using the channel response obtaining in described a, to after the channel response zero setting of the power maximum respective path in described a, re-execute a, b and c, until reach the set point number that circulation is carried out.

5. according to the method described in claim 3 or 4, it is characterized in that, after described a, also comprise:

If the path that the described power maximum of b2 is the first transmitting terminal, determines the interference of path corresponding to described power maximum to described the second transmitting terminal;

C2, in the response of described second channel, remove the interference of path corresponding to described power maximum to described the second transmitting terminal, second channel response using the channel response obtaining in described a, to after the channel response zero setting of the described power maximum respective path in described a, re-execute a, b and c, until reach to set, carry out number of times.

6. method according to claim 3, is characterized in that, describedly according to the response of described the first channel response and described second channel, determines power maximum, comprising:

According to $h_x\left(\mathrm{tap}\right)=\underset{j\∈{\mathrm{\μ}}_i}{\max }\left\{\underset{n=0...N_{\mathrm{IFFT}}-1}{\max }\right\{\underset{r=0...R-1}{\mathrm{\Σ}}{\left|h_j^r\left(n\right)\right|}^2\left\}\right\},$ Determine the maximum of described the first transmitting terminal in the power in time domain Nei Ge path, or the maximum of described the second transmitting terminal in the power in time domain Nei Ge path;

In maximum from described the first transmitting terminal the power in time domain Nei Ge path and the maximum of described the second transmitting terminal in the power in time domain Nei Ge path, determine described power maximum;

Wherein, for the first channel response corresponding to described the first transmitting terminal j, r is the antenna sequence number of described the first transmitting terminal j, and R is the antenna sum of described the first transmitting terminal j, N _iFFTfor obtaining counting of the inverse Fourier transform of carrying out in described the first channel response process, η _ifor described the first transmitting terminal, x represents the first transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the first transmitting terminal x in time domain; Or,

for second channel response corresponding to described the second transmitting terminal j, r is the antenna sequence number of described the second transmitting terminal j, and R is the antenna sum of described the second transmitting terminal j, N _iFFTfor obtaining counting of the inverse Fourier transform of carrying out in described second channel response process, η _ifor the set that all described the second transmitting terminal forms, x represents the second transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the second transmitting terminal x in time domain.

7. method according to claim 3, it is characterized in that, describedly determine that path corresponding to described power maximum, to the interference of described the first transmitting terminal and the interference to each the second transmitting terminal except the second transmitting terminal corresponding to described power maximum, comprising:

According to I _j=h _x(tap) * IFFT (S _x/ S _j), I _j=(I _j> > (tap)), determine that path corresponding to described power maximum is to the interference of described the first transmitting terminal and the interference to each the second transmitting terminal except the second transmitting terminal corresponding to described power maximum;

Wherein, x represents the second transmitting terminal that power maximum is corresponding, and tap represents the tapGe footpath of the second transmitting terminal x in time domain, j ≠ x, S _xthe reference signal sequence that represents the second transmitting terminal x, S _jrepresent the reference signal sequence of the first transmitting terminal j or the reference signal sequence of the second transmitting terminal except the second transmitting terminal corresponding to described power maximum, h _x(tap) be the channel response of power maximum respective path.

8. method according to claim 5, is characterized in that, describedly determines the interference of path corresponding to described power maximum to described the second transmitting terminal, comprising:

According to I _j=h _x(tap) * IFFT (S _x/ S _j), I _j=(I _j> > (tap)), determine the interference of path corresponding to described power maximum to described the second transmitting terminal;

Wherein, x represents the first transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the first transmitting terminal x in time domain, j ≠ x, S _xthe reference signal sequence that represents the first transmitting terminal x, S _jthe reference signal sequence that represents the first transmitting terminal j, h _x(tap) be the channel response of power maximum respective path.

9. a channel estimating apparatus, is characterized in that, comprising:

First processor, for overlapping at least one second transmitting terminal of setting thresholding that surpasses of Resource Block definite and the first transmitting terminal;

Channel estimator, for obtaining the first channel response in the reference signal time domain of described the first transmitting terminal, the second channel response of the reference signal of obtaining described the second transmitting terminal in time domain;

Described first processor also for: according to described second channel, the power in described the second transmitting terminal path in time domain is obtained in response, and according to the interference of the second transmitting terminal to described the first transmitting terminal described in the power determination in described the second transmitting terminal path in time domain, in described the first channel response, remove the interference of described the second transmitting terminal to described the first transmitting terminal.

10. device according to claim 9, it is characterized in that, described first processor specifically for: according to described the first channel response, obtain the power in described the first transmitting terminal path in time domain, and according to the interference of the first transmitting terminal to described the second transmitting terminal described in the power determination in described the first transmitting terminal path in time domain; In second channel response corresponding to described the second transmitting terminal, remove the interference of described the first transmitting terminal to described the second transmitting terminal, obtain the 3rd channel response; According to described the 3rd channel response, obtain the power in described the second transmitting terminal path in time domain, and according to the interference of the second transmitting terminal to described the first transmitting terminal described in the power determination in described the second transmitting terminal path in time domain.

11. according to the device described in claim 9 or 10, it is characterized in that, described first processor is specifically for: a, according to described the first channel response and the response of described second channel, determine power maximum, described power maximum is that described the first transmitting terminal is in power and the maximum of described the second transmitting terminal in the power in time domain Nei Ge path in time domain Nei Ge path; If the path that the described power maximum of b is the second transmitting terminal, determines the interference of path corresponding to described power maximum to described the first transmitting terminal; C, in described the first channel response, remove the interference of path corresponding to described power maximum to described the first transmitting terminal.

12. devices according to claim 11, it is characterized in that, described first processor also for: the first channel response using the channel response obtaining after described the first channel response disturbs in described a, will re-execute a, b and c after the channel response zero setting of the power maximum respective path in described a; In second channel response corresponding to each the second transmitting terminal except the second transmitting terminal corresponding to described power maximum, the interference of the path of removing the second transmitting terminal corresponding to described power maximum to this second transmitting terminal, second channel response using the channel response obtaining in described a, to after the channel response zero setting of the power maximum respective path in described a, re-execute a, b and c, until reach the set point number that circulation is carried out.

13. according to the device described in claim 11 or 12, it is characterized in that, described first processor also for: after carrying out described a, if the interference of path corresponding to described power maximum to described the second transmitting terminal determined in the path that the described power maximum of b2 is the first transmitting terminal; C2, in the response of described second channel, remove the interference of path corresponding to described power maximum to described the second transmitting terminal, second channel response using the channel response obtaining in described a, to after the channel response zero setting of the described power maximum respective path in described a, re-execute a, b and c, until reach to set, carry out number of times.

14. devices according to claim 11, is characterized in that, described first processor specifically for: according to $h_x\left(\mathrm{tap}\right)=\underset{j\∈{\mathrm{\μ}}_i}{\max }\left\{\underset{n=0...N_{\mathrm{IFFT}}-1}{\max }\right\{\underset{r=0...R-1}{\mathrm{\Σ}}{\left|h_j^r\left(n\right)\right|}^2\left\}\right\},$ Determine the maximum of described the first transmitting terminal in the power in time domain Nei Ge path, or the maximum of described the second transmitting terminal in the power in time domain Nei Ge path; In maximum from described the first transmitting terminal the power in time domain Nei Ge path and the maximum of described the second transmitting terminal in the power in time domain Nei Ge path, determine described power maximum; Wherein,

for the first channel response corresponding to described the first transmitting terminal j, r is the antenna sequence number of described the first transmitting terminal j, and R is the antenna sum of described the first transmitting terminal j, N _iFFTfor obtaining counting of the inverse Fourier transform of carrying out in described the first channel response process, η _ifor described the first transmitting terminal, x represents the first transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the first transmitting terminal x in time domain; Or, for second channel response corresponding to described the second transmitting terminal j, r is the antenna sequence number of described the second transmitting terminal j, and R is the antenna sum of described the second transmitting terminal j, N _iFFTfor obtaining counting of the inverse Fourier transform of carrying out in described second channel response process, η _ifor the set that all described the second transmitting terminal forms, x represents the second transmitting terminal that power maximum is corresponding, and tap represents the tapGe path of the second transmitting terminal x in time domain.

15. devices according to claim 13, is characterized in that, described first processor specifically for: according to I _j=h _x(tap) * IFFT (S _x/ S _j), I _j=(I _j> > (tap)), determine the interference of path corresponding to described power maximum to described the first transmitting terminal; Wherein, x represents the second transmitting terminal that power maximum is corresponding, and tap represents the tapGe footpath of the second transmitting terminal x in time domain, j ≠ x, S _xthe reference signal sequence that represents the second transmitting terminal x, S _jthe reference signal sequence that represents the first transmitting terminal j, h _x(tap) be the channel response of power maximum respective path.

16. devices according to claim 13, is characterized in that, described first processor specifically for: according to I _j=h _x(tap) * IFFT (S _x/ S _j), I _j=(I _j> > (tap)), determine the interference of path corresponding to described power maximum to described the second transmitting terminal; Wherein, x represents the first transmitting terminal that power maximum is corresponding, and tap represents the tapGe footpath of the first transmitting terminal x in time domain, j ≠ x, S _xthe reference signal sequence that represents the first transmitting terminal x, S _jthe reference signal sequence that represents the first transmitting terminal j, h _x(tap) be the channel response of power maximum respective path.

17. 1 kinds of receivers, is characterized in that, comprising: receiver, the second processor, demodulator and the channel estimating apparatus as described in claim 9-16 any one;

Described receiver, the reference signal and the data-signal that for receiving the first transmitting terminal, send, and receive reference signal and the data-signal that at least one second transmitting terminal sends;

Described the second processor, for the first channel response of removing interference that described channel estimating apparatus is obtained, transform to frequency domain, obtain reference signal that the first transmitting terminal sends the 4th channel response in frequency domain, and described the 4th channel response is carried out to the channel response that interpolation obtains the data-signal that the first transmitting terminal sends;

Described demodulator, the data-signal sending for described the first transmitting terminal described receiver being received according to the channel response of the data-signal of described the first transmitting terminal transmission carries out demodulation.

Images