WO2014036836A1

WO2014036836A1 - Method and device for eliminating interference signals

Info

Publication number: WO2014036836A1
Application number: PCT/CN2013/074691
Authority: WO
Inventors: 陆晓峰; 刘丽娜
Original assignee: 华为技术有限公司
Priority date: 2012-09-05
Filing date: 2013-04-25
Publication date: 2014-03-13
Also published as: CN103686752A

Abstract

The present invention relates to the field of signal technology. A method for eliminating interference signals is disclosed by the embodiment of the present invention, comprising: acquiring a receiving signal of a neighbor cell, and obtaining a signal in the local cell active frequency band from said receiving signal of the neighbor cell; according to said signal in the local cell active frequency band of the neighbor cell and the signal in the active frequency band of the local cell, calculating the interference signal of the local cell; filtering out said interference signal of the local cell from the receiving signal of the local cell, and obtaining the useful signal of the local cell. The embodiment of the present invention calculates the interference signal of the local cell according to the receiving signal of the neighbor cell, hence the interference signal of the local cell can be acquired without obtaining the number of the interference sources, and the problem that the interference can not be eliminated effectively in the situation of a limited number of antennas and a variable number of interference sources is solved. A device for eliminating interference signals is also disclosed by the embodiment of the present invention.

Description

Method and device for eliminating interference signal

This application claims priority to Chinese Patent Application No. 201210324807.1, entitled "A Method and Apparatus for Eliminating Interference Signals", filed on September 5, 2012, the entire contents of which is incorporated herein by reference. In the application. Technical field

The present invention relates to the field of signal technologies, and more particularly to a method and apparatus for canceling interference signals. Background technique

Co-channel interference refers to the interference of the carrier frequency of the unwanted signal and the carrier frequency of the wanted signal, and the antenna that receives the same-frequency useful signal. In general, two networks within a cell can reasonably plan the resources of the radio spectrum to avoid co-channel interference. However, at the boundary of two adjacent cells, the network between the two cells often causes co-channel interference due to the close distance or the effect of the atmospheric waveguide.

At present, the method for eliminating co-channel interference commonly used in the industry is mainly a beamforming method. However, the existing beamforming method has strict requirements on the number of base station antennas, and the number of transmitting antennas of the base station must be larger than the number of interference sources to eliminate. interference. In two different networks, the number of antennas is limited, and the number of interference sources is often unknown. It is difficult to calculate the characteristics of the interference source and choose the appropriate method to eliminate the interference. Summary of the invention

In order to effectively eliminate interference when the number of antennas is limited and the number of interference sources is variable, the first aspect of the application provides a method for eliminating interference signals, including:

Obtaining a received signal of a neighboring cell, and obtaining a signal of the received signal of the neighboring cell on an active frequency band of the local cell;

Calculating an interference signal of the local cell according to the signal of the neighboring cell on the active frequency band of the local cell and the signal on the active frequency band of the local cell;

The interference signal of the local cell is filtered by using the received signal of the local cell to obtain a useful signal of the local cell. In a specific implementation manner of the first aspect of the application:

Calculating the interference signal of the local cell according to the signal of the neighboring cell on the active frequency band of the local cell and the signal of the active frequency band of the local cell, including: according to the activation frequency band of the neighboring cell in the local cell And a signal on the activated frequency band of the local cell, and a transfer function of the two cells on the activated frequency band of the local cell;

The interference function of the own cell is calculated by using the transfer function.

The obtaining a transfer function of the two cells on the activation frequency band of the cell includes:

The transfer function is obtained by dividing a signal of the neighboring cell on an active frequency band of the own cell from a signal on an active frequency band of the own cell.

The transfer function is obtained by a least mean square LMS algorithm according to the signal of the neighboring cell on the active frequency band of the local cell and the signal on the active frequency band of the local cell.

The transfer function is obtained by a minimum mean square error square MMSE algorithm according to the signal of the neighboring cell on the active frequency band of the local cell and the signal on the active frequency band of the local cell. A first aspect of the present application provides an apparatus for canceling an interference signal, including:

An acquiring unit, configured to acquire a received signal of a neighboring cell, obtain a signal of the received signal of the neighboring cell on an active frequency band of the local cell, and obtain a received signal of the neighboring cell on an active frequency band of the local cell. Signal is transmitted to the computing unit;

a calculating unit, configured to receive, by the acquiring unit, a signal of a received signal of the neighboring cell on an active frequency band of the local cell, and a signal according to the neighboring cell in an active frequency band of the local cell, and the local cell a signal on the active frequency band, calculating an interference signal of the local cell, and transmitting the interference signal of the local cell to the filtering unit;

And a filtering unit, configured to receive an interference signal of the local cell from the computing unit, and filter the interference signal of the local cell by using a received signal of the local cell to obtain a useful signal of the local cell.

In a specific implementation manner of the first aspect of the application:

The calculating unit includes: a transfer function determining module, configured to obtain, according to a signal of the neighboring cell on an active frequency band of the local cell and a signal on an active frequency band of the local cell, a transfer function of the two cells on an active frequency band of the local cell, and Transfer function is transmitted to the interference signal calculation module;

And an interference signal calculation module, configured to receive the transfer function from the transfer function determining module, and calculate an interference signal of the local cell by using the transfer function.

The transfer function determining module includes:

And a first determining module, configured to divide a signal of the neighboring cell on an active frequency band of the local cell and a signal on an active frequency band of the local cell to obtain the transfer function.

The transfer function determining module includes:

And a second determining module, configured to obtain the transfer function by using a least mean square LMS algorithm according to a signal of the neighboring cell on an active frequency band of the current cell and a signal on an active frequency band of the local cell.

The transfer function determining module includes:

And a third determining module, configured to obtain the transfer function by using a minimum mean square error square MMSE algorithm according to a signal of the neighboring cell on an active frequency band of the current cell and a signal on an active frequency band of the local cell. The embodiment of the present application calculates the interference signal of the local cell according to the received signal of the neighboring cell. Therefore, the interference signal of the local cell can be obtained without using the number of interference sources, and the number of antennas is limited, and the number of interference sources cannot be determined. Effectively eliminate interference problems. DRAWINGS

FIG. 1 is a schematic flowchart of a method for canceling an interference signal according to an embodiment of the present disclosure; FIG. 2 is a schematic flowchart of a method for canceling an interference signal according to an embodiment of the present disclosure; A schematic diagram of the structure of the intra-cell antenna and the reference channel distribution;

FIG. 4 is a schematic diagram of processing of receiving signals in each receiving antenna in a cell disclosed in an embodiment of the present application; FIG.

FIG. 5 is a method for calculating an interference signal in a cell according to an embodiment of the present disclosure; FIG. 6 is a schematic flowchart of another method for canceling an interference signal according to an embodiment of the present disclosure; FIG. 7 is a schematic structural diagram of another antenna in a cell and a reference channel according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of an apparatus for canceling an interference signal according to an embodiment of the present application. detailed description

The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the drawings in the embodiments of the present application. It is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without the creative work are all within the scope of the present application. The embodiment of the present application discloses a method for eliminating an interference signal, and FIG. 1:

S101: Acquire a received signal of a neighboring cell, and obtain a signal that the received signal of the neighboring cell is in an active frequency band of the local cell.

S102: Calculate an interference signal of the local cell according to a signal of a neighboring cell in an active frequency band of the current cell and a signal on an active frequency band of the local cell.

S103: Filtering the interference signal of the local cell by using the received signal of the local cell to obtain a useful signal of the local cell.

The embodiment of the present application calculates the interference signal of the local cell according to the received signal of the neighboring cell. Therefore, the interference signal of the local cell can be obtained without using the number of interference sources, and the number of antennas is limited, and the number of interference sources cannot be determined. Effectively eliminate interference problems. Referring to Figure 2, there is shown a flow diagram of one embodiment of a method of canceling an interference signal of the present application.

Obtaining the received signal of the neighboring cell, and obtaining the signal of the received signal of the neighboring cell in the active frequency band of the local cell, in this embodiment, the interference signal of the current cell is calculated by using the received signals of all the neighboring cells as an example, and the implementation is performed. Examples include:

S201: Acquire a received signal of a neighboring cell, and obtain a received signal of all neighboring cells in the local cell. The signal on the active band.

The following is an example of a cellular network. It can be understood that the embodiment is not limited to a cellular network. The three cells in the cellular network are cell cell ₂ and cell _{3 respectively} , and the interference signals in the cel^ are calculated and eliminated by using the received signals of all cells adjacent to the cel.

Celli, cell ₂ , and cell ₃ are provided with receiving antennas, and the received signals received by the antennas in each cell are signals of the full frequency band. The full frequency band of the received signals received by cel^, cell ₂ and cell ₃ is f _r f ₈ , which can be extracted by subcarrier extraction methods such as FFT (Fast Fourier Transformation) algorithm or adaptive filtering algorithm. Each cell activates a frequency band and an inactive frequency band, wherein an active frequency band in cel is an active frequency band in f _l cell ₂ is _3⁄4 , an active frequency band in cell ₃ is f _k , and i, j, k are any one of 1-8 Natural number, and i≠j≠k. Only the signal of each cell on the active useful signal frequency band, the frequency band signals to other parts of the interference signal to cel ^ an example, that is, the two receive antennas CEL A ₂ are received by the receiving The signal, the received signal is a mixed signal of the useful signal and the interference signal, wherein, for cel, the received signal is only a useful signal in the frequency band, and the interference signal is in other frequency bands; for cell ₂ and cell ₃ , cell _2. The received signal in cell ₃ has only an interference signal on the active band of cel^. Cell ₂ and cell _{3 are} similar to 06^, except that the received signal in cell ₂ is a useful signal in the 3⁄4 band, and the interference signal is in the other band; the received signal in cell ₂ is in the f _k band. The useful signal, the interference signal in other frequency bands, will not be described here.

Refer to Figure 3:

There are two receiving antennas and A _{2 in} cel , and two reference channels R _A1 and R _A2 ;

Cell ₂ has two receiving antennas and B ₂ , and two reference channels R _B1 and R _B2 ;

There are two receiving antennas d and C _{2 in} cell ₃ , and two reference channels R _C1 and R _C2 .

The received signals are received by the receiving antennas in the cell. Each receiving antenna passes the received signal through the filter and LNA (Low Noise Amplifier) and splits into two paths, one through the intermediate frequency and enters the baseband processing unit (BBU, Building). Base band Unit) is processed, and the other way (shown in the block diagram of the lower part of Figure 4) is used as the input of its corresponding reference channel. Taking the receiving antenna Α ₂ as an example, the receiving signal received by the receiving antenna Α ₂ enters the baseband processing unit BBU for processing, and the other input is input to R _C2 , sequentially passes through the R _C2 filter, LNA, and the intermediate frequency is processed to enter the baseband. The processing unit BBU, the receiving antenna in each cell receives the signal of the full frequency band, but the BBU only processes the signal on the activated frequency band of the local cell, and after the signals of other cells are introduced, the activation frequency bands of different cells are different, that is, A signal is obtained for the inactive band. Obtaining all input signals input to the cell by the cell adjacent to the cel^, and acquiring, in the input signal, signals of all the cells adjacent to the cel in the cel active frequency band, the signal is only an interference signal, and the above input signal is The received signal of the antenna in cell ₂ and cell ₃ .

By analogy, the three-sector receiving antenna and its corresponding reference channel can be connected. The connection relationship between the receiving antenna and its corresponding reference channel is shown in Table 1:

Table 1

S202: Obtain a transfer function of the two cells on the activated frequency band of the local cell according to the signal of the adjacent cell in the active frequency band of the local cell and the signal in the active frequency band of the local cell.

Specifically, the signal of the neighboring cell in the active frequency band of the local cell is an interference signal, and the signal on the active frequency band of the current cell is a mixed signal of the useful signal and the interference signal, according to the interference of the neighboring cell in the active frequency band of the local cell. The signal and the mixed signal on the active frequency band of the local cell obtain a transfer function between the two cells, and the interference function of the local cell is extracted by using the transfer function.

Regardless of whether the interference source is a single interference source or a multi-interference source, the received signals of two adjacent cells only have differences in amplitude and phase in the same frequency band. Therefore, after obtaining the received signals of the adjacent two cells, only two adjacent ones are obtained. The received signal of the cell only has the difference in amplitude and phase in the same frequency band, and the interference signal of the local cell can be obtained by the signal of the neighboring cell in the activated frequency band of the local cell. The above transfer function is a function of the adjacent two cells in the same frequency band related to the amplitude difference and the phase difference.

The following is a detailed introduction to the generation process of the transfer function. A. The signal of the neighboring cell in the active frequency band of the local cell is divided by the signal on the active frequency band of the local cell to obtain a transfer function.

1. The transfer function between two cells in a single-tone conditional direct path scenario:

The single tone condition is only one frequency band, and there is no relationship between the transfer function and the frequency band. It is only necessary to find the transfer function in this frequency band. The direct path condition is that the transmitter and the antenna do not pass through the scatterer and arrive directly. Used to transmit signals, and the antenna is used to receive signals;

D )=D(/) ) ;

(f);

among them:

y _sYI (/) represents the signal of cel in the activation band of the cell; F«x ₂ (/) represents the signal of ^ce 3⁄4 in the live band of cel 3⁄4;

^ ₃ (/) indicates the signal of cell ₃ on the live band f of cel _3⁄4 ;

D(f) represents the transmitter-to-antenna transfer matrix; represents the transmitter's transmit signal; g. Indicates the amplitude difference of the signal of cel and cell ₂ on the live band f of cel 3⁄4; j represents the imaginary part of the real number;

θ. Indicates the phase difference between the signals of cel and cell ₂ on the live band f of cel 3⁄2; 2 ₁ represents the transfer function of cel^ and cell ₂ on the live band f of cel 3⁄4. H ₃₁ represents the transfer function of cel and cell ₃ on the live band f of cel _3⁄4 g. Indicates the amplitude difference of the signal of cel and cell ₃ on the live band f of cel _3⁄4 ; Q _D represents the phase difference of the signal of cell and cell ₃ on the live band f of cel _3⁄4 .

2. The transfer function between two cells in a scattering path scenario:

In the scene of the scattering path, the signal of the transmitter passes through the scatterer and reaches the antenna, and only arrives after the scatterer.

Where Γ^' (/) represents the signal of cel in the active frequency band f of the cell; F _M2 '(/) represents the signal of cell ₂ in the cell ^3⁄4 live band f; 1^ ₃ '(/) denotes cell ₃ a signal on the cell ^3⁄4 live band f;

B(f) represents the transfer matrix between the scatterers; T{f) represents the transfer matrix of the transmitter to the scatterer; represents the transmit signal representing the transmitter;

S{f) represents a transfer matrix between the scatterers and the antenna; represents an identity matrix;

P represents the amplitude difference of the signal of cel and cell ₂ on the live band f of cel 3⁄4; θ _β represents the phase difference between the signal of cel and cell ₂ on the live band f of cel _3⁄4 ; g' _R represents the amplitude difference of the signal of cel and cell ₃ on the live band f\ of cel; θ represents cel and cell _{3 is} in cel 3⁄4 The phase difference of the signal on the active frequency f.

3. Other transfer functions between two cells in a non-one main path scenario:

In this scenario, the antenna and the transmitter are reached by multiple paths, some of which are directly reached without passing through the scatterer, and some of the paths are reached after passing through the scatterer.

There is " ( _f „ „

2 ^{1 {} '

^Ψ where:

Γ^πΊ/) indicates that cel activates the signal on the frequency band f in the cell; y _ra2 " (/) indicates the signal of ^ce on the cell ₁ 3⁄4 live band f;

^ (/) denotes the transfer matrix between the scatterers and the antenna; g" _R denotes the amplitude difference between the signals of cel and cell ₂ on the cell ^3⁄4 live band f\ due to the direct path;

Representing the phase difference caused by the direct path of the signal of cel and cell ₂ on the cel^ activation band fi;

^ represents the amplitude difference caused by the scattering path of the signal of cel^ and cell ₂ in the cel^ activation band fi;

θ represents the phase difference of the signal of cel and cell ₂ in the cell band 3 on the live band f due to the scattering diameter;

g represents the amplitude difference between cel and cell ₂ in the signal on the live band f of cel 3⁄4;

^ denotes the phase difference between cel and cell ₂ in the signal on the cel 3 live band f.

In summary, from the above three scenarios, you can get: The transfer function of celli and cell ₂ on the cel 3⁄4 live band f is:

H2i(f = S ₂ i ex (- i);

among them:

g ₂₁ denotes the amplitude difference between cel and cell ₂ in the signal on the live band f of cel 3⁄4;

Represents the phase difference between cel^ and cell ₂ in the cel 3⁄4 live band f signal.

Correspondingly, the transfer function of cel^ and cell ₃ on the cel _3⁄4 live band fi is:

among them:

g ₃₁ denotes the amplitude difference between cel^ and cell ₃ in the signal on the live band f of cel _3⁄4 ;

Indicates the difference in amplitude between cel^ and cell ₃ on the cel _3⁄4 live band f;

B. The transfer function is obtained by using a least mean square LMS algorithm according to the signal of the adjacent cell in the active frequency band of the current cell and the signal on the active frequency band of the local cell.

Y _RXi ^e '(f) = H _l X _l +I _l +N _l

among them:

Indicates the signal that the i-th cell activates the frequency band f in the cell.

^ is the channel coefficient of the i-th cell;

Χ'· is a useful signal source for the i-th cell;

Is the interference of the i-th cell;

W ' is the noise of the i-th cell; where i = 1, 2, 3.

Because there are both interference signals and useful signals in the active band of cel^, and cell ₂ and cell ₃ only have interference signals in the cell 々 activation band, the least mean square LMS algorithm can be used to find the optimal W.

Min IHA +1, +^- W ₂ - W _l N ₂ 1;

W

ST |w I = 1 or,

-W ₂ N ₃ \;

ST \w ₂ \ = i; where W! ^ cel and cell ₂ are transfer functions on the cel 3⁄4 live band fi; W ₂ is the transfer function of cel and cell ₃ on the cel _3⁄4 live band f.

C. Obtaining the transfer function by using a minimum mean square error square MMSE algorithm according to a signal of a neighboring cell on an active frequency band of the local cell and a signal on an active frequency band of the local cell.

Select the appropriate cost function, choose to use the interference decision method to obtain the best W value, and estimate the weight of the three cells: minE +N, -W!L-W!N^

S.T or minE + N, -W'L-W'N,

ST | | = l. Where is the transfer function of cel and 0611 ₂ on the cel 3⁄4 live band fi; W ₂ ' is the transfer function of cel and cell ₃ on the cel _3⁄4 live band f.

S203: Calculate the interference signal of the cell by using the above transfer function, refer to FIG. 5:

The interference signal on the antenna is: h ₃₁₁ *R _A1 +h ₂₁₂ *R _A2 ,;

The interference signal on antenna A ₂ is: h ₃₁₂ *R _A1 +h ₂₁₁ *R _A2 ;

among them:

h ₃₁₁ is a transfer function of the received signal in the antenna d in the cell ₃ and the received signal in the antenna on the cel active frequency band f; h ₂₁₂ is a transfer function of the received signal in the antenna B ₂ in the cell ₂ and the received signal in the antenna on the cel active frequency band f;

h ₃₁₂ is a transfer function of the received signal in antenna C ₂ in cell ₃ and the received signal in antenna A ₂ on cel active frequency band f;

h ₂₁₁ is a transfer function of the received signal in the antenna in the cell ₂ and the received signal in the antenna A ₂ on the cel^ active frequency band f;

R _A1 is the signal input from the antenna d in the cell ₃ to the R _A1 reference channel in the cel, and the signal on the cel activation band f;

R _A2 is the signal that the antenna Bj in cell ₂ is input to the R _A2 reference channel in cellj and is activated on the frequency band f of the cell.

Or,

The interference signal on the antenna is: W ₂₁ *R _A1 +W ₁₂ *R _A2 ;

The interference signal on antenna A ₂ is: W ₂₂ *R _A1 +W _U *R _A2 ;

among them:

W ₂₁ is a transfer function of the received signal in the antenna in the cell ₃ and the received signal in the antenna on the ce^ active band ^;

W ₁₂ is a transfer function of the received signal in the antenna B ₂ in the cell ₂ and the received signal in the antenna on the cel active frequency band f;

W ₂₂ is a transfer function of the received signal in the antenna C ₂ in the cell ₃ and the received signal in the antenna A ₂ on the cel active frequency band f;

W _n is a transfer function of the received signal in the antenna in cell ₂ and the received signal in antenna A ₂ on the cel active frequency band f;

R _A1 is the signal input from the antenna in cell ₃ to the R _A1 reference channel in cel, and the signal on the cel^ activation band f;

R _A2 is the signal input from the antenna in cell ₂ to the R _A2 reference channel in cel and activated on band cel in cel.

Or,

The interference signal on the antenna is: W' ₂₁ *R _A1 +W' ₁₂ *R _A2 ; The interference signal on antenna A ₂ is: W' ₂₂ *R _A1 +W' _U *R _A2 ;

among them:

W' ₂₁ is a transfer function of the received signal in the antenna in cell ₃ and the received signal in antenna k on the cel active frequency band f;

\¥' ₁₂ is the transfer function of the received signal in antenna B ₂ in cell ₂ and the received signal in antenna k on the cel active frequency band f;

W' ₂₂ is a transfer function of the received signal in the antenna C ₂ in the cell ₃ and the received signal in the antenna A ₂ on the cel active frequency band f;

W _λλ is a transfer function of the received signal in the antenna in cell ₂ and the received signal in antenna A ₂ on the cel active frequency band fi;

S204: Filtering the interference signal of the local cell by using the received signal of the local cell to obtain a useful signal of the local cell.

A ₁ useful signal = Ai received signal - Ai interference signal;

2 useful signal = A ₂ received signal - Ai interference signal. Referring to FIG. 6, a schematic flowchart of an embodiment of a method for canceling an interference signal according to the present application is shown.

Obtaining the received signal of the neighboring cell, and obtaining the signal of the received signal of the neighboring cell in the active frequency band of the local cell. In this embodiment, the interference signal of the local cell is calculated by using the received signal of the neighboring cell as an example, where The received signal of a part of neighboring cells may be: a signal with the highest power in the active frequency band of the current cell. It can ensure that the power of the interference signal is greater than the power of the noise signal, so that the transfer function can be accurately calculated. Specifically, the embodiment includes:

S301: Acquire a received signal of the neighboring cell, obtain a signal that the received signal of the neighboring cell has the highest power in the active frequency band of the local cell, and calculate an interference signal of the local cell according to the signal with the highest power. The following also takes a cellular network as an example. The three cells in the cellular network are cel^, cell ₂ , and cell _{3 respectively} , and the received signals in the cells of cell ₂ and cell ₃ are used in the active frequency band f of the cel^. The largest signal calculates and eliminates the interfering signal in ce^.

Obtaining the received signals input by all neighboring cells to the local cell, and selecting the most power in the active frequency band of the local cell

Cell ₃ has a receiving antenna C ₃ and two reference channels R _C1 and R _C2 .

The received signal is received by the receiving antenna in the cell, and each receiving antenna divides the received signal into two paths through the filter and the LNA, and one path enters the baseband processing unit BBU through the intermediate frequency for processing, and the other path serves as a reference channel corresponding thereto. Input. Taking the receiving antenna as an example, the signal received by the receiving antenna A1 enters the baseband processing unit BBU for processing, and the other path is input to the reference channel R _B2 and the reference channel R _C2 , respectively, and sequentially passes through the reference channel R _B2 and the reference channel R _{C2 .} The filter, LNA, IF processing enters the baseband processing unit BBU.

By analogy, the three-sector receiving antenna and its corresponding reference channel can be connected. The connection relationship between the receiving antenna and its corresponding reference channel is shown in Table 2: Table 2

Taking cel as an example, the signals in the R _A1 reference channel and the R _A2 reference channel are obtained, and the signal with the highest power in the cel active band is selected, that is, the R _A1 reference channel and the R _A2 reference channel are selected in the cel active band. The signal with the highest power obtains the signal with the highest power, and the signal with the largest power is: the signal that the neighboring cell has the highest interference power on the activation frequency of the cell.

S302: According to the signal with the highest power and the signal in the active frequency band of the local cell, the transfer function of the two cells in the activated frequency band of the local cell is obtained. After obtaining the signal with the highest power, the transfer function h _x of the signal with the highest power and the received signal of the receiving antenna A ₃ on the active band of the cel is obtained according to the method obtained by the transfer function in the above S102.

K = g _x ex (-73⁄4) ;

Wherein, the amplitude difference between the signal with the highest power and the received signal of the receiving antenna A ₃ on the active frequency band of the cel^;

The phase difference between the signal with the highest power and the received signal of the receiving antenna A ₃ on the active band of the cel.

S303: Calculate an interference signal of the local cell by using the foregoing transfer function.

The dry 4 especially signal on antenna A ₃ is: (/) g _x exp(- );

S304: Filter the interference signal from the received signal in the local cell to obtain a useful signal of the local cell. The useful signals for this cell are: 1 exp(- _x )

among them, ! (/) indicates that cel^ activates the signal on the frequency band f in the cell;

A signal indicating that the signal with the highest power is on the active frequency band f of cel^. It should be noted that, in the foregoing embodiments, the number of the receiving antennas in the respective cells is not limited to the number of the embodiments, and may be multiple, and details are not described herein. Corresponding to the above embodiments of the present invention, the embodiment of the present application further provides an interference signal cancellation device.

Please refer to Figure 8. The device includes:

The obtaining unit 801 is configured to acquire a received signal of the neighboring cell, obtain a signal that the received signal of the neighboring cell is in an active frequency band of the local cell, and obtain a signal that the received signal of the neighboring cell is in an active frequency band of the local cell. Transfer to the computing unit;

The calculating unit 802 is configured to receive, by the acquiring unit, a signal of the received signal of the neighboring cell on an active frequency band of the local cell, and a signal according to the active cell of the neighboring cell in the active frequency band of the local cell, and an active frequency band of the local cell. Signal on the cell, calculate the interference signal of the cell, and the above-mentioned cell The interference signal is transmitted to the filtering unit;

The filtering unit 803 is configured to receive the interference signal of the local cell from the calculating unit, and filter the interference signal of the local cell by using the received signal of the local cell to obtain a useful signal of the local cell.

Further, the foregoing calculating unit includes:

a transfer function determining module, configured to obtain a transfer function of the two cells on the active frequency band of the cell according to the signal of the neighboring cell on the active frequency band of the current cell and the signal on the active frequency band of the local cell, and obtain the transfer function Transmitted to the interference signal calculation module;

The interference signal calculation module is configured to receive the transfer function from the transfer function determining module, and calculate the interference signal of the local cell by using the transfer function.

Further, the above transfer function determining module includes:

The first determining module is configured to divide the signal of the neighboring cell on the active frequency band of the local cell and the signal on the active frequency band of the local cell to obtain the transfer function.

Further, the above transfer function determining module includes:

And a second determining module, configured to obtain the foregoing transfer function by using a least mean square LMS algorithm according to the signal of the neighboring cell on the active frequency band of the current cell and the signal on the active frequency band of the current cell.

Further, the above transfer function determining module includes:

And a third determining module, configured to obtain the foregoing transfer function by using a minimum mean square error square MMSE algorithm according to a signal of the neighboring cell on an active frequency band of the current cell and a signal on an active frequency band of the current cell.

The embodiment of the present application calculates the interference signal of the local cell according to the received signal of the neighboring cell, so that the interference signal of the local cell can be obtained without knowing the number of the interference source, and the number of the antenna is limited, and the number of the interference source is uncertain. The problem of interference cannot be effectively eliminated. A person skilled in the art can understand that the drawings are only a schematic diagram of a preferred embodiment, and the modules or processes in the drawings are not necessarily required to implement the application.

Those skilled in the art can understand that the modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the embodiment, or may be correspondingly changed in one or more apparatuses different from the embodiment. The modules of the above embodiments may be combined into one module, or may be further split into multiple modules. Submodule.

One of ordinary skill in the art will appreciate that all or part of the processing of the above-described embodiments can be accomplished by a program that instructs related hardware, which can be stored in a computer readable storage medium.

The above description of the disclosed embodiments enables those skilled in the art to make or use the application. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application is not limited to the embodiments shown herein, but is to be accorded the broadest scope of the principles and novel features disclosed herein.

Claims

Rights request

1. A method for eliminating interference signals, which is characterized by including:

Obtain the received signal of the adjacent cell and obtain the signal of the received signal of the adjacent cell on the activated frequency band of the current cell;

Calculate the interference signal of this cell according to the signal of the adjacent cell on the active frequency band of this cell and the signal on the active frequency band of this cell;

The received signal of this cell is used to filter out the interference signal of this cell, and the useful signal of this cell is obtained.

2. The method according to claim 1, characterized in that, the interference signal of the current cell is calculated based on the signal of the adjacent cell on the active frequency band of the current cell and the signal on the active frequency band of the current cell. , including: obtaining the transfer functions of the two cells on the activated frequency band of the current cell based on the signals of the adjacent cells on the activated frequency band of the current cell and the signals on the activated frequency band of the current cell;

The transfer function is used to calculate the interference signal of this cell.

3. The method according to claim 2, characterized in that: obtaining the transfer functions of the two cells on the activated frequency band of the current cell includes:

The transfer function is obtained by dividing the signal of the adjacent cell on the active frequency band of the current cell by the signal on the active frequency band of the current cell.

4. The method according to claim 2, characterized in that: obtaining the transfer functions of the two cells on the activated frequency band of the current cell includes:

According to the signal of the adjacent cell on the activated frequency band of the current cell and the signal on the activated frequency band of the local cell, the least mean square LMS algorithm is used to obtain the transfer function.

5. The method according to claim 2, characterized in that: obtaining the transfer functions of the two cells on the activated frequency band of the current cell includes:

According to the signal of the adjacent cell on the active frequency band of the current cell and the signal on the active frequency band of the current cell, the minimum mean square error MMSE algorithm is used to obtain the transfer function.

6. An interference signal elimination device, characterized in that it includes:

Acquisition unit, used to obtain the received signal of the adjacent cell to obtain the received signal of the adjacent cell signals on the activated frequency band of the current cell, and transmit signals of the received signals of the adjacent cells on the activated frequency band of the current cell to the computing unit;

A calculation unit configured to receive, from the acquisition unit, a signal of the received signal of the neighboring cell on the active frequency band of the current cell, and according to the signal of the neighboring cell on the activated frequency band of the current cell and the signal of the local cell. activate the signal on the frequency band, calculate the interference signal of this cell, and transmit the interference signal of this cell to the filtering unit;

A filtering unit is configured to receive the interference signal of the current cell from the calculation unit, and use the received signal of the current cell to filter out the interference signal of the current cell to obtain the useful signal of the current cell.

7. The device according to claim 6, characterized in that the calculation unit includes: a transfer function determination module, configured to determine the difference between the signal of the neighboring cell on the active frequency band of the current cell and the signal of the current cell. Activating the signal on the frequency band, obtaining the transfer function of the two cells on the activated frequency band of the current cell, and transmitting the transfer function to the interference signal calculation module;

An interference signal calculation module, configured to receive the transfer function from the transfer function determination module, and use the transfer function to calculate the interference signal of this cell.

8. The device according to claim 7, characterized in that the transfer function determination module includes:

The first determination module is used to divide the signal of the adjacent cell on the active frequency band of the current cell by the signal on the active frequency band of the current cell to obtain the transfer function.

9. The device according to claim 7, characterized in that the transfer function determination module includes:

The second determination module is configured to obtain the transfer function by using the least mean square LMS algorithm based on the signal of the adjacent cell on the activated frequency band of the current cell and the signal on the activated frequency band of the local cell.

10. The device according to claim 7, characterized in that the transfer function determination module includes:

The third determination module is configured to obtain the transfer function by using the minimum mean square error MMSE algorithm based on the signal of the adjacent cell on the active frequency band of the current cell and the signal on the active frequency band of the local cell.