CN103686752A - Method and device for eliminating interference signals - Google Patents

Abstract

The application relates to the technical field of signals, and discloses a method for eliminating interference signals. The method comprises the following steps: acquiring receiving signals of an adjacent cell to obtain signals which are on the local cell activation frequency band of the adjacent cell receiving signals; calculating local cell interference signals according to the signals which are on the local cell activation frequency band of the adjacent cell receiving signals and local cell signals on the local cell activation frequency band; using local cell receiving signals to filtrate out the local cell interference signals to obtain local cell useful signals. According to the method, as the local cell interference signals are calculated by using the adjacent cell receiving signals, the local cell interference signals can be obtained without using the number of interference sources, so that the problem that the interference can not be eliminated effectively under the situation that the number of antennas is limited and the number of the interference sources is uncertain is solved. The embodiment of the application further discloses a device for eliminating the interference signals.

Description

A kind of removing method of interference signal and device

Technical field

The present invention relates to signalling technique field, more particularly, relate to a kind of removing method and device of interference signal.

Background technology

It is identical with the carrier frequency of useful signal that co-channel interference refers to the carrier frequency of unwanted signal, and to receiving the interference with the antenna of useful signal causes frequently.Common, the resource of two rational programming wireless frequency spectrums of networks meeting in Yi Ge community is to avoid co-channel interference.But the boundary two neighbor cells, usually due to the effect apart from too near or atmospheric duct, can make the network between Liang Ge community produce co-channel interference.

At present, the method of the elimination co-channel interference that industry is general is mainly the method for beam forming, but existing beam-forming method is stricter for the requirement of antenna for base station number, the number that the number of the transmitting antenna of base station must be greater than interference source just can eliminate interference.And in two different networks, the number of antenna is limited, interference source number is ignorant often, is difficult to like this calculate the characteristic of interference source, selects suitable method to eliminate interference.

Summary of the invention

For limited in number of antennas, in the indefinite situation of interference source number, effectively to eliminate and disturb, the application's first aspect provides a kind of removing method of interference signal, comprising:

Obtain the reception signal of neighbor cell, obtain the signal on the activation frequency band of reception signal Zhe community of described neighbor cell;

Signal according on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, calculates the interference signal of this community;

Utilize the interference signal of this community described in the reception target signal filter of this community, obtain the useful signal of this community.

In the specific implementation of the application's first aspect:

Described according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, calculate the interference signal of this community, comprise: according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, obtain two Zhe communities, community and activate the transfer function on frequency band;

Utilize described transfer function to calculate the interference signal of this community.

The transfer function on frequency band is activated in the described two Zhe communities, community that obtain, and comprising:

Signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community is divided by, obtains described transfer function.

The transfer function on frequency band is activated in the described two Zhe communities, community that obtain, and comprising:

According to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, utilize lowest mean square LMS algorithm to obtain described transfer function.

The transfer function on frequency band is activated in the described two Zhe communities, community that obtain, and comprising:

According to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, utilize least mean-square error side's MMSE algorithm to obtain described transfer function.

The application's first aspect provides a kind of cancellation element of interference signal, comprising:

Acquiring unit, for obtaining the reception signal of neighbor cell, obtains the signal on the activation frequency band of reception signal Zhe community of described neighbor cell, and the signal on the activation frequency band of the reception signal Zhe community of described neighbor cell is transferred to computing unit;

Computing unit, for receive the signal the activation frequency band of reception signal Zhe community of described neighbor cell from described acquiring unit, and according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, calculate the interference signal of this community, and the interference signal of described this community is transferred to filtering unit;

Filtering unit, for receive the interference signal of described this community from described computing unit, and the interference signal of utilizing this community described in the reception target signal filter of this community, obtains the useful signal of this community.

In the specific implementation of the application's first aspect:

Described computing unit, comprising:

Transfer function determination module, be used for according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, obtain two Zhe communities, community and activate the transfer function on frequency band, and described transfer function is transferred to interference signal computing module;

Interference signal computing module, for receiving described transfer function from described transfer function determination module, and utilizes described transfer function to calculate the interference signal of this community.

Described transfer function determination module, comprising:

The first determination module, for the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community is divided by, obtains described transfer function.

Described transfer function determination module, comprising:

The second determination module, for according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, utilizes lowest mean square LMS algorithm to obtain described transfer function.

Described transfer function determination module, comprising:

The 3rd determination module, for according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, utilizes least mean-square error side's MMSE algorithm to obtain described transfer function.

Because the embodiment of the present application is according to the interference signal of this community of reception calculated signals of neighbor cell, therefore, can also can obtain the interference signal of this community without interference source number, solve number of antennas limited, in the indefinite situation of interference source number, can not effectively eliminate the problem of interference.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present application 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 only some embodiment of the application, 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 schematic flow sheet of the removing method of the disclosed a kind of interference signal of the embodiment of the present application;

Fig. 2 is the schematic flow sheet of the removing method of disclosed another interference signal of the embodiment of the present application;

Fig. 3 is the structural representation that the embodiment of the present application disclosed a kind of community internal antenna and reference channel distribute;

Fig. 4 receives the processing schematic diagram of signal in each reception antenna in the disclosed community of the embodiment of the present application;

Fig. 5 is a kind of method of calculating interference signal in the disclosed community of the embodiment of the present application;

Fig. 6 is the schematic flow sheet of the removing method of disclosed another interference signal of the embodiment of the present application;

Fig. 7 is the structural representation that the embodiment of the present application disclosed another kind of community internal antenna and reference channel distribute;

Fig. 8 is the structural representation of the cancellation element of the disclosed a kind of interference signal of the embodiment of the present application.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.

The embodiment of the present application discloses a kind of removing method of interference signal, with reference to figure 1:

S101: obtain the reception signal of neighbor cell, obtain the signal on the activation frequency band of reception signal Zhe community of neighbor cell.

S102: the signal according on the activation frequency band of the signal Yu Zhe community on the activation frequency band of Zhe community, neighbor cell, calculates the interference signal of this community.

S103: utilize the interference signal of this community of reception target signal filter of this community, obtain the useful signal of this community.

Because the embodiment of the present application is according to the interference signal of this community of reception calculated signals of neighbor cell, therefore, can also can obtain the interference signal of this community without interference source number, solve number of antennas limited, in the indefinite situation of interference source number, can not effectively eliminate the problem of interference.

Referring to Fig. 2, show the schematic flow sheet of an embodiment of the removing method of a kind of interference signal of the application.

Obtain the reception signal of neighbor cell, obtain the signal on the activation frequency band of reception signal Zhe community of neighbor cell, the interference signal that the present embodiment be take by this community of reception calculated signals of all neighbor cells describes as example, and this embodiment comprises:

S201: obtain the reception signal of neighbor cell, obtain the signal on the activation frequency band of reception signal Zhe community of all neighbor cells.

Below all take cellular network as example describes, be understandable that, the present embodiment is not limited to cellular network.3 communities in cellular network are respectively cell ₁, cell ₂, cell ₃, utilize all and cell ₁the reception calculated signals of adjacent community is also eliminated cell ₁in interference signal.

Cell ₁, cell ₂, cell ₃inside be provided with reception antenna, the antenna reception in each community to reception signal be the signal of Whole frequency band.Cell ₁, cell ₂with cell ₃in the Whole frequency band of the reception signal that receives be f ₁-f ₈, can utilize FFT(Fast Fourier Transformation, fast Fourier transform) and the subcarrier extracting method such as algorithm or adaptive filter algorithm extracts and obtains each community and activate frequency band and un-activation frequency band, wherein, cell ₁in activation frequency band be f _i, cell ₂in activation frequency band be f _i, cell ₃in activation frequency band be f _k, i, j, k are any natural number in 1-8, and i ≠ j ≠ k.Each community is only useful signal at the signal activating on frequency band, and the signal on the frequency band of other parts is interference signal, with cell ₁for example, that is to say cell ₁in two reception antenna A ₁and A ₂what all receive is to receive signal, and receiving signal is the mixed signal of useful signal and interference signal, wherein, and for cell ₁, receive signal only at f _ion frequency band is useful signal, and on other frequency bands is interference signal; For cell ₂, cell ₃, cell ₂, cell ₃in reception signal at cell ₁activation frequency band f _ion only there is interference signal.Cell ₂, cell ₃with cell ₁similar, different, cell ₂in reception signal at f _jon frequency band is useful signal, and on other frequency bands is interference signal; Cell ₂in reception signal at f _kon frequency band is useful signal, and on other frequency bands is interference signal, at this, does not repeat.

With reference to figure 3:

Cell ₁inside there are two reception antenna A ₁and A ₂, and two reference channel R _a1and R _a2;

Cell ₂inside there are two reception antenna B ₁and B ₂, and two reference channel R _b1and R _b2;

Cell ₃inside there are two reception antenna C ₁and C ₂, and two reference channel R _c1and R _c2.

Receiving signal is received by the reception antenna in community, each reception antenna by the signal receiving by filter and LNA (low noise amplifier, Low Noise Amplifier) after, be divided into two-way, the intermediate frequency of leading up to enters into baseband processing unit (BBU, Building Base band Unit) process, an other road (as shown in the block diagram of Fig. 4 the latter half) is as the input of the reference channel corresponding with it.With reception antenna A ₂for example, reception antenna A ₂reception signal one road receiving enters into baseband processing unit BBU and processes, and an other road is input to R _c2, pass through successively R _c2filter, LNA, after the processing of intermediate frequency, enter into baseband processing unit BBU, what the reception antenna in each community received is the signal of Whole frequency band, but BBU only processes this community and activates the signal on frequency band, after the signal leading of other communities, because the activation frequency band of different districts is different, obtain the signal of inactive frequency band.Obtain all and cell ₁adjacent community inputs to the input signal of this community, and in input signal, obtains all and cell ₁adjacent community is at cell ₁activate the signal on frequency band, this signal is only interference signal, and above-mentioned input signal is cell ₂, cell ₃the reception signal of middle antenna.

By that analogy, the reference channel that the reception antenna of three sectors is corresponding with it can couple together, and the annexation of the reference channel that reception antenna is corresponding with it is as shown in table 1:

Table 1

Reception antenna A 1	Reference channel R B2
		Reception antenna A 2	Reference channel R C2
Reception antenna B 1	Reference channel R A2
		Reception antenna B2	Reference channel R C1
Reception antenna C 1	Reference channel R A1
		Reception antenna C 2	Reference channel R B1

S202: according to the signal on the activation frequency band of the signal Yu Zhe community on the activation frequency band of Zhe community, neighbor cell, obtain two Zhe communities, community and activate the transfer function on frequency band.

Concrete, signal on the activation frequency band of Zhe community, neighbor cell is interference signal, signal on the activation frequency band of this community is the mixed signal of useful signal and interference signal, the mixed signal on frequency band is activated in the interference signal Yu Zhe community of activating on frequency band according to place, Zhe community, neighbor cell, obtain the transfer function between two communities, utilize transfer function to extract the interference signal of this community.

No matter interference source is single interference source or many interference sources, in identical frequency band, only there is the difference in amplitude and phase place in the reception signal of adjacent two communities, therefore, after obtaining the reception signal of adjacent two communities, as long as obtain the reception signal of adjacent two communities, in identical frequency band, only there is the difference in amplitude and phase place, can obtain by the signal on Zhe community, neighbor cell activation frequency band the interference signal of this community.And above-mentioned transfer function is adjacent two communities function relevant to amplitude difference and phase difference in identical frequency band.

Below the detailed production process of introducing transfer function.

Signal on the activation frequency band of the signal Yu Zhe community on the activation frequency band of A, Zhe community, neighbor cell is divided by, and obtains transfer function.

1, the transfer function of two minizones under single-tone condition line of sight scene:

Single-tone condition is for only having a frequency band, and between transfer function and frequency band, it doesn't matter, and a demand goes out the transfer function under this frequency band; Line of sight situation be between transmitter and antenna without scattering object, directly arrive, transmitter is used for transmitted signal, antenna is used for receiving signal;

Y _RX1(f)=D(f)·X(f);

Y _RX2(f)=g _D·exp(-j·θ _D)D(f)·X(f);

Y _RX3(f)=g′ _D·exp(-j·θ′ _D)D(f)·X(f)

$H_{21}\left(f\right)=\frac{Y_{\mathrm{RX}2}\left(f\right)}{Y_{\mathrm{RX}1}\left(f\right)}=g_D\·\exp (-j\·{\mathrm{\θ}}_D);$

$H_{31}\left(f\right)=\frac{Y_{\mathrm{RX}3}\left(f\right)}{Y_{\mathrm{RX}1}\left(f\right)}={g^{\′}}_D\·\exp (-j\·{{\mathrm{\θ}}^{\′}}_D)$

Wherein:

Y _rX1(f) represent cell ₁frequency band f is activated in Zhe community _ion signal;

Y _rX2(f) represent cell ₂at cell ₁activate frequency band f _ion signal;

Y _rX3(f) represent cell ₃at cell ₁activate frequency band f _ion signal;

D (f) represents that transmitter is to the transfer matrix of antenna;

X (f) represents the transmitted signal of transmitter;

G _drepresent cell ₁with cell ₂at cell ₁activate frequency band f _ion the amplitude difference of signal;

J represents the imaginary part of real number;

θ _drepresent cell ₁with cell ₂at cell ₁activate frequency band f _ion the phase difference of signal;

H ₂₁represent cell ₁with cell ₂at cell ₁activate frequency band f _ion transfer function.

H ₃₁represent cell ₁with cell ₃at cell ₁activate frequency band f _ion transfer function

G ' _drepresent cell ₁with cell ₃at cell ₁activate frequency band f _ion the amplitude difference of signal;

θ ' _drepresent cell ₁with cell ₃at cell ₁activate frequency band f _ion the phase difference of signal.

2. the transfer function of two minizones under a scattering footpath scene:

Under the scene of scattering footpath, the signal of transmitter arrives antenna after scattering object, and only has a footpath to arrive after scattering object.

${Y_{\mathrm{RX}1}}^{\′}\left(f\right)=[\frac{S\left(f\right)}{I-B\left(f\right)}\·T\left(f\right)]\·X^{\′}\left(f\right);$

${Y_{\mathrm{RX}2}}^{\′}\left(f\right)=[g_R\·\exp (-j\·{\mathrm{\θ}}_R)\frac{S\left(f\right)}{I-B\left(f\right)}\·T\left(f\right)]\·X^{\′}\left(f\right);$

${Y_{\mathrm{RX}3}}^{\′}\left(f\right)=[{g^{\′}}_R\·\exp (-j\·{{\mathrm{\θ}}^{\′}}_R)\frac{S\left(f\right)}{I-B\left(f\right)}\·T\left(f\right)]\·X^{\′}\left(f\right);$

${H_{21}}^{\′}\left(f\right)=\frac{{Y_{\mathrm{RX}2}}^{\′}\left(f\right)}{{Y_{\mathrm{RX}1}}^{\′}\left(f\right)}=g_R\·\exp (-j\·{\mathrm{\θ}}_R)$

${H_{31}}^{\′}\left(f\right)=\frac{{Y_{\mathrm{RX}3}}^{\′}\left(f\right)}{{Y_{\mathrm{RX}1}}^{\′}\left(f\right)}={g^{\′}}_R\·\exp (-j\·{{\mathrm{\θ}}^{\′}}_R)$

Wherein, Y _rX1' (f) represent cell ₁frequency band f is activated in Zhe community _ion signal;

Y _rX2' (f) represent cell ₂at cell ₁activate frequency band f _ion signal;

Y _rX3' (f) represent cell ₃at cell ₁activate frequency band f _ion signal;

B (f) represents the transfer matrix between scattering object;

T (f) represents that transmitter is to the transfer matrix of scattering object;

X ' (f) represents the transmitted signal of transmitter;

S (f) represents that scattering object is to the transfer matrix between antenna;

I representation unit matrix;

G _rrepresent cell ₁with cell ₂at cell ₁activate frequency band f _ion the amplitude difference of signal;

θ _rrepresent cell ₁with cell ₂at cell ₁activate frequency band f _ion the phase difference of signal;

G ' _rrepresent cell ₁with cell ₃at cell ₁activate frequency band f _ion the amplitude difference of signal;

θ ' _rrepresent cell ₁with cell ₃at cell ₁activate frequency band f _ion the phase difference of signal.

3. the transfer function of two minizones under other non-main footpath scenes:

Under this scene, between Antenna+Transmitter, by mulitpath, reach, wherein some footpath is directly to reach without scattering object, some footpath just arrives after scattering object.

Have ${H_{21}}^{\′\′}\left(f\right)=\frac{{Y_{\mathrm{RX}2}}^{\′\′}\left(f\right)}{{Y_{\mathrm{RX}1}}^{\′\′}\left(f\right)}=\frac{g_D^{\′\′}\exp (-j{\mathrm{\θ}}_D^{\′\′})D^{\′}\left(f\right)+g_R^{\′\′}\exp (-j{\mathrm{\θ}}_R^{\′\′})S^{\′}\left(f\right)}{D^{\′}\left(f\right)+S^{\′}f}=g^{\′\′}\exp (-j{\mathrm{\φ}}^{\′\′})$

Wherein:

Y _rX1" (f) represent cell ₁frequency band f is activated in Zhe community _ion signal;

Y _rX2" (f) represent cell ₂at cell ₁activate frequency band f _ion signal;

S ' (f) represents that scattering object is to the transfer matrix between antenna;

G " _rrepresent cell ₁with cell ₂at cell ₁activate frequency band f _ion signal due to direct projection footpath cause amplitude difference;

θ " _drepresent cell ₁with cell ₂at cell ₁activate frequency band f _ion signal due to direct projection footpath cause phase difference;

G " represents cell ₁with cell ₂at cell ₁activate frequency band f _ion signal due to scattering footpath cause amplitude difference;

θ " _rrepresent cell ₁with cell ₂at cell ₁activate frequency band f _ion signal due to scattering footpath cause phase difference;

G represents cell ₁with cell ₂at cell ₁activate frequency band f _ion signal between amplitude difference;

φ represents cell ₁with cell ₂at cell ₁activate frequency band f _ion signal between phase difference.

To sum up, under above-mentioned three scenes, can obtain:

Cell ₁and cell ₂at cell ₁activate frequency band f _ion transfer function be:

h ₂₁(f)=g ₂₁exp(-jφ ₂₁)；

Wherein:

G ₂₁represent cell ₁with cell ₂at cell ₁activate frequency band f _iamplitude difference between upper signal;

φ ₂₁represent cell ₁with cell ₂at cell ₁activate frequency band f _iphase difference between upper signal.

Accordingly, cell ₁and cell ₃at cell ₁activate frequency band f _ion transfer function be:

h ₃₁(f)=g ₃₁exp(-jφ ₃₁)；

Wherein:

G ₃₁represent cell ₁with cell ₃at cell ₁activate frequency band f _iamplitude difference between upper signal;

φ ₃₁represent cell ₁with cell ₃at cell ₁activate frequency band f _iamplitude difference between upper signal; .

B, according to the signal on the activation frequency band of the signal Yu Zhe community on the activation frequency band of Zhe community, neighbor cell, utilize lowest mean square LMS algorithm to obtain described transfer function.

Y _RX1″′(f)=H ₁X ₁+I ₁+N ₁

Y _RX2″′(f)=H ₂X ₂+I ₂+N ₂

Y _RX3″′(f)=H ₃X ₃+I ₃+N ₃

Wherein:

Y _rXi" ' (f) represents Zhe community, i community activation frequency band f _ion signal.

H _iit is the channel coefficients of i community;

X _iit is the useful signal source of i community;

I _iit is the interference of i community;

N _iit is the noise of i community; Wherein, i=1,2,3.

Because at cell ₁activation frequency band have interference signal and useful signal, and cell simultaneously ₂and cell ₃at cell ₁activation frequency band on only have interference signal, therefore, can utilize lowest mean square LMS algorithm, find optimum W and make

$\underset{W}{\min }|H_1{X}_1+I_1+N_1-W_1{I}_2-W_1{N}_2|;$

S.T|W ₁|=1。

Or,

$\underset{W}{\min }|H_1{X}_1+I_1+N_1-W_2{I}_3-W_2{N}_3|;$

S.T|W ₂|=1；

Wherein, W ₁for cell ₁and cell ₂at cell ₁activate frequency band f _ion transfer function;

W ₂for cell ₁and cell ₃at cell ₁activate frequency band f _ion transfer function.

C, according to the signal on the activation frequency band of the signal Yu Zhe community on the activation frequency band of Zhe community, neighbor cell, utilize least mean-square error side's MMSE algorithm to obtain described transfer function.

Select suitable cost function, select to utilize and disturb decision-making technique to obtain best W value, estimate the weighted value of San Ge community:

$\underset{W}{\min }E\left({\left|\right|I_1+N_1-W_1^{\′}{I}_2-W_1^{\′}{N}_2\left|\right|}^2\right);$

S.T|W ₁|＝1。

Or,

$\underset{W}{\min }E\left({\left|\right|I_1+N_1-W_2^{\′}{I}_2-W_2^{\′}{N}_2\left|\right|}^2\right);$

S.T|W′ ₂|=1。

Wherein, W ₁' be cell ₁and cell ₂at cell ₁activate frequency band f _ion transfer function;

W ₂' be cell ₁and cell ₃at cell ₁activate frequency band f _ion transfer function.

S203: utilize above-mentioned transfer function to calculate the interference signal of this community, with reference to figure 5:

Antenna A ₁on interference signal be: h ₃₁₁* R _a1+ h ₂₁₂* R _a2;

Antenna A ₂on interference signal be: h ₃₁₂* R _a1+ h ₂₁₁* R _a2;

Wherein:

H ₃₁₁for cell ₃in antenna C ₁in reception signal and antenna A ₁middle reception signal is at cell ₁activate frequency band f _ion transfer function;

H ₂₁₂for cell ₂in antenna B ₂in reception signal and antenna A ₁middle reception signal is at cell ₁activate frequency band f _ion transfer function;

H ₃₁₂for cell ₃in antenna C ₂in reception signal and antenna A ₂middle reception signal is at cell ₁activate frequency band f _ion transfer function;

H ₂₁₁for cell ₂in antenna B ₁in reception signal and antenna A ₂middle reception signal is at cell ₁activate frequency band f _ion transfer function;

R _a1for cell ₃in antenna C ₁input to cell ₁middle R _a1in reference channel, and at cell ₁activate frequency band f _ion signal;

R _a2for cell ₂in antenna B ₁input to cell ₁middle R _a2in reference channel, and at cell ₁activate frequency band f _ion signal.

Or,

Antenna A ₁on interference signal be: W ₂₁* R _a1+W ₁₂* R _a2;

Antenna A ₂on interference signal be: W ₂₂* R _a1+ W ₁₁* R _a2;

Wherein:

W ₂₁for cell ₃in antenna C ₁in reception signal and antenna A ₁middle reception signal is at cell ₁activate frequency band f _ion transfer function;

W ₁₂for cell ₂in antenna B ₂in reception signal and antenna A ₁middle reception signal is at cell ₁activate frequency band f _ion transfer function;

W ₂₂for cell ₃in antenna C ₂in reception signal and antenna A ₂middle reception signal is at cell ₁activate frequency band f _ion transfer function;

W ₁₁for cell ₂in antenna B ₁in reception signal and antenna A ₂middle reception signal is at cell ₁activate frequency band f _ion transfer function;

R _a1for cell ₃in antenna C ₁input to cell ₁middle R _a1in reference channel, and at cell ₁activate frequency band f _ion signal;

R _a2for cell ₂in antenna B ₁input to cell ₁middle R _a2in reference channel, and at cell ₁activate frequency band f _ion signal.

Or,

Antenna A ₁on interference signal be: W ' ₂₁* R _a1+ W ' ₁₂* R _a2;

Antenna A ₂on interference signal be: W ' ₂₂* R _a1+ W ' ₁₁* R _a2;

Wherein:

W ' ₂₁for cell ₃in antenna C ₁in reception signal and antenna A ₁middle reception signal is at cell ₁activate frequency band f _ion transfer function;

W ' ₁₂for cell ₂in antenna B ₂in reception signal and antenna A ₁middle reception signal is at cell ₁activate frequency band f _ion transfer function;

W ' ₂₂for cell ₃in antenna C ₂in reception signal and antenna A ₂middle reception signal is at cell ₁activate frequency band f _ion transfer function;

W ' ₁₁for cell ₂in antenna B ₁in reception signal and antenna A ₂middle reception signal is at cell ₁activate frequency band f _ion transfer function;

R _a1for cell ₃in antenna C ₁input to cell ₁middle R _a1in reference channel, and at cell ₁activate frequency band f _ion signal;

R _a2for cell ₂in antenna B ₁input to cell ₁middle R _a2in reference channel, and at cell ₁activate frequency band f _ion signal.

S204: utilize the interference signal of this community of reception target signal filter of this community, obtain the useful signal of this community.

A ₁useful signal=A ₁receive signal-A ₁interference signal;

A ₂useful signal=A ₂receive signal-A ₁interference signal.

Referring to Fig. 6, show the schematic flow sheet of an embodiment of the removing method of a kind of interference signal of the application.

Obtain the reception signal of neighbor cell, obtain the signal on the activation frequency band of reception signal Zhe community of neighbor cell, the interference signal that the present embodiment be take by this community of reception calculated signals of part neighbor cell describes as example, wherein, the reception signal of part neighbor cell can be: prominent signal on the activation frequency band of Zhe community.Its power of power ratio noise signal that can guarantee interference signal is large, the transfer function that can calculate accurately like this, and concrete, this embodiment comprises:

S301: obtain the reception signal of neighbor cell, obtain prominent signal on the activation frequency band of reception signal Zhe community of neighbor cell, according to the interference signal of this community of above-mentioned prominent calculated signals.

Below also all take cellular network as example explanation, 3 communities in cellular network are respectively cell ₁, cell ₂, cell ₃, utilize cell ₂, cell ₃reception signal in Liang Ge community is at cell ₁activation frequency band f _iupper prominent calculated signals is also eliminated cell ₁in interference signal.

Obtain the reception signal that all neighbor cells input to this community, be chosen in this community and activate prominent signal on frequency band, obtain above-mentioned prominent signal.

Referring to Fig. 7:

Cell ₁inside there is reception antenna A ₃, and two reference channel R _a1and R _a2;

Cell ₂inside there is reception antenna B ₃, and two reference channel R _b1and R _b2;

Cell ₃inside there is reception antenna C ₃, and two reference channel R _c1and R _c2.

Receiving signal is received by the reception antenna in community, each reception antenna is divided into two-way by the signal receiving after by filter and LNA, the intermediate frequency of leading up to enters into baseband processing unit BBU and processes, and an other road is as the input of the reference channel corresponding with it.With reception antenna A ₁for example, signal one road that reception antenna A1 receives enters into baseband processing unit BBU and processes, and an other road is input to respectively reference channel R _b2with reference channel R _c2, and respectively successively by reference to passage R _b2with reference channel R _c2filter, LNA, enters into baseband processing unit BBU after the processing of intermediate frequency.

By that analogy, the reference channel that the reception antenna of three sectors is corresponding with it can couple together, and the annexation of the reference channel that reception antenna is corresponding with it is as shown in table 2:

Table 2

Reception antenna A 3	Reference channel R B2With reference channel R C2
		Reception antenna B 3	Reference channel R A2With reference channel R C1
Reception antenna C 3	Reference channel R A1With reference channel R B1

With cell ₁for example, obtain R _a1reference channel and R _a2signal in reference channel, is chosen in cell ₁activate frequency band f _iupper prominent signal, that is to say, selects R _a1reference channel and R _a2in reference channel at cell ₁activate frequency band f _iupper prominent signal, obtains above-mentioned prominent signal, and this prominent signal is also: the signal of interference power maximum in the activation frequency of Zhe community, neighbor cell.

S302: according to the signal on the activation frequency band of above-mentioned prominent signal Yu Zhe community, obtain two Zhe communities, community and activate the transfer function on frequency band.

After obtaining above-mentioned prominent signal, according to the method that in above-mentioned S102, transfer function draws, obtain above-mentioned prominent signal and reception antenna A ₃on reception signal at cell ₁activation frequency band on transfer function h _x.

h _X=g _Xexp(-jφ _X)；

Wherein, g _xfor above-mentioned prominent signal and reception antenna A ₃on reception signal at cell ₁activation frequency band on amplitude difference;

φ _xfor above-mentioned prominent signal and reception antenna A ₃on reception signal at cell ₁activation frequency band on phase difference.

S303: utilize above-mentioned transfer function to calculate the interference signal of this community.

Antenna A ₃on interference signal be: Y _x(f) g _xexp (j φ _x);

S304: elimination interference signal in the reception signal in Cong Zhe community, obtains the useful signal of this community.

The useful signal of this community is: Y ₁(f)-Y _x(f) g _xexp (j φ _x)

Wherein, Y ₁(f) represent cell ₁frequency band f is activated in Zhe community _ion signal;

Y _x(f) represent that above-mentioned prominent signal is at cell ₁activation frequency band f _ion signal.

It should be noted that, in each above-mentioned embodiment, the number of the reception antenna arranging in each community is not limited to the number in embodiment, also can, for a plurality of, at this, not repeat.

Embodiment is corresponding with foregoing invention, and the embodiment of the present application also provides a kind of cancellation element of interference signal.

Please refer to Fig. 8, this device comprises:

Acquiring unit 801, for obtaining the reception signal of neighbor cell, obtain the signal on the activation frequency band of reception signal Zhe community of above-mentioned neighbor cell, and the signal on the activation frequency band of the reception signal Zhe community of above-mentioned neighbor cell is transferred to computing unit;

Computing unit 802, for receive the signal the activation frequency band of reception signal Zhe community of above-mentioned neighbor cell from above-mentioned acquiring unit, and according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, above-mentioned neighbor cell and above-mentioned this community, calculate the interference signal of this community, and the interference signal of above-mentioned this community is transferred to filtering unit;

Filtering unit 803, for receive the interference signal of above-mentioned this community from above-mentioned computing unit, and the interference signal of utilizing above-mentioned this community of reception target signal filter of this community, obtains the useful signal of this community.

Further, above-mentioned computing unit, comprising:

Transfer function determination module, be used for according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, above-mentioned neighbor cell and above-mentioned this community, obtain two Zhe communities, community and activate the transfer function on frequency band, and above-mentioned transfer function is transferred to interference signal computing module;

Interference signal computing module, for receiving above-mentioned transfer function from above-mentioned transfer function determination module, and utilizes above-mentioned transfer function to calculate the interference signal of this community.

Further, above-mentioned transfer function determination module, comprising:

The first determination module, for the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, above-mentioned neighbor cell and above-mentioned this community is divided by, obtains above-mentioned transfer function.

Further, above-mentioned transfer function determination module, comprising:

The second determination module, for according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, above-mentioned neighbor cell and above-mentioned this community, utilizes lowest mean square LMS algorithm to obtain above-mentioned transfer function.

Further, above-mentioned transfer function determination module, comprising:

The 3rd determination module, for according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, above-mentioned neighbor cell and above-mentioned this community, utilizes least mean-square error side's MMSE algorithm to obtain above-mentioned transfer function.

Because the embodiment of the present application is according to the interference signal of this community of reception calculated signals of neighbor cell, therefore, needn't learn that interference source number also can obtain the interference signal of this community, has solved number of antennas limited, in the indefinite situation of interference source number, can not effectively eliminate the problem of interference.

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the application is necessary.

It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.

One of ordinary skill in the art will appreciate that all or part of processing in above-described embodiment method is to come the hardware that instruction is relevant to complete by program, described program can be stored in a kind of computer-readable recording medium.

Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the application.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can be in the situation that do not depart from the application's spirit or scope, realization in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (10)

1. a removing method for interference signal, is characterized in that, comprising:

Obtain the reception signal of neighbor cell, obtain the signal on the activation frequency band of reception signal Zhe community of described neighbor cell;

Signal according on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, calculates the interference signal of this community;

Utilize the interference signal of this community described in the reception target signal filter of this community, obtain the useful signal of this community.

2. method according to claim 1, it is characterized in that, described according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, calculate the interference signal of this community, comprise: according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, obtain two Zhe communities, community and activate the transfer function on frequency band;

Utilize described transfer function to calculate the interference signal of this community.

3. method according to claim 2, is characterized in that, described in obtain two Zhe communities, community and activate the transfer function on frequency bands, comprising:

Signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community is divided by, obtains described transfer function.

4. method according to claim 2, is characterized in that, described in obtain two Zhe communities, community and activate the transfer function on frequency bands, comprising:

According to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, utilize lowest mean square LMS algorithm to obtain described transfer function.

5. method according to claim 2, is characterized in that, described in obtain two Zhe communities, community and activate the transfer function on frequency bands, comprising:

According to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, utilize least mean-square error side's MMSE algorithm to obtain described transfer function.

6. a cancellation element for interference signal, is characterized in that, comprising:

Acquiring unit, for obtaining the reception signal of neighbor cell, obtains the signal on the activation frequency band of reception signal Zhe community of described neighbor cell, and the signal on the activation frequency band of the reception signal Zhe community of described neighbor cell is transferred to computing unit;

Computing unit, for receive the signal the activation frequency band of reception signal Zhe community of described neighbor cell from described acquiring unit, and according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, calculate the interference signal of this community, and the interference signal of described this community is transferred to filtering unit;

Filtering unit, for receive the interference signal of described this community from described computing unit, and the interference signal of utilizing this community described in the reception target signal filter of this community, obtains the useful signal of this community.

7. device according to claim 6, is characterized in that, described computing unit, comprising:

Transfer function determination module, be used for according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, obtain two Zhe communities, community and activate the transfer function on frequency band, and described transfer function is transferred to interference signal computing module;

Interference signal computing module, for receiving described transfer function from described transfer function determination module, and utilizes described transfer function to calculate the interference signal of this community.

8. device according to claim 7, is characterized in that, described transfer function determination module, comprising:

The first determination module, for the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community is divided by, obtains described transfer function.

9. device according to claim 7, is characterized in that, described transfer function determination module, comprising:

The second determination module, for according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, utilizes lowest mean square LMS algorithm to obtain described transfer function.

10. device according to claim 7, is characterized in that, described transfer function determination module, comprising:

The 3rd determination module, for according to the signal on the activation frequency band of the signal on the activation frequency band of Zhe community, described neighbor cell and described this community, utilizes least mean-square error side's MMSE algorithm to obtain described transfer function.

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