CN103686752A - Method and device for eliminating interference signals - Google Patents
Method and device for eliminating interference signals Download PDFInfo
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- CN103686752A CN103686752A CN201210324807.1A CN201210324807A CN103686752A CN 103686752 A CN103686752 A CN 103686752A CN 201210324807 A CN201210324807 A CN 201210324807A CN 103686752 A CN103686752 A CN 103686752A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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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
Technical Field
The present invention relates to the field of signal technology, and more particularly, to a method and an apparatus for eliminating an interference signal.
Background
The same-frequency interference refers to the interference caused by the same carrier frequency of the useless signal and the carrier frequency of the useful signal to the antenna receiving the same-frequency useful signal. Generally, two networks in a cell can reasonably plan the resources of the radio spectrum to avoid co-channel interference. But at the border of two adjacent cells, co-channel interference is caused to the network between the two cells, often due to too close distance or the effect of atmospheric waveguides.
At present, the common method for eliminating co-channel interference in the industry is mainly a beam forming method, but the existing beam forming method has a strict requirement on the number of antennas of a base station, and the number of transmitting antennas of the base station must be greater 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, so that the characteristics of the interference sources are difficult to calculate, and a proper method is selected to eliminate interference.
Disclosure of Invention
In order to effectively eliminate interference under the condition that the number of antennas is limited and the number of interference sources is not limited, a first aspect of the present application provides an interference signal elimination method, including:
acquiring a receiving signal of an adjacent cell to obtain a signal of the receiving signal of the adjacent cell on an activated frequency band of the cell;
calculating the interference signal of the cell according to the signal of the adjacent cell on the active frequency band of the cell and the signal of the active frequency band of the cell;
and 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.
In a specific implementation of the first aspect of the present application:
the calculating the interference signal of the local cell according to the signal of the adjacent cell on the active frequency band of the local cell and the signal of the active frequency band of the local cell includes: obtaining transfer functions of two cells on the active frequency band of the cell according to the signals of the adjacent cells on the active frequency band of the cell and the signals of the active frequency band of the cell;
and calculating the interference signal of the cell by using the transfer function.
The obtaining a transfer function of the two cells on the active frequency band of the cell includes:
and dividing the signal of the adjacent cell on the activated frequency band of the cell with the signal of the activated frequency band of the cell to obtain the transfer function.
The obtaining a transfer function of the two cells on the active frequency band of the cell includes:
and obtaining the transfer function by utilizing a Least Mean Square (LMS) algorithm according to the signals of the adjacent cells on the active frequency band of the cell and the signals of the adjacent cells on the active frequency band of the cell.
The obtaining a transfer function of the two cells on the active frequency band of the cell includes:
and obtaining the transfer function by using a Minimum Mean Square Error (MMSE) algorithm according to the signals of the adjacent cells on the activated frequency band of the cell and the signals of the activated frequency band of the cell.
A first aspect of the present application provides an apparatus for eliminating an interference signal, including:
an acquiring unit, configured to acquire a received signal of an adjacent cell, obtain a signal of the received signal of the adjacent cell on an active frequency band of a local cell, and transmit the signal of the received signal of the adjacent cell on the active frequency band of the local cell to a computing unit;
a calculating unit, configured to receive, from the obtaining unit, a signal of the received signal of the neighboring cell on the active frequency band of the local cell, calculate 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 of the active frequency band of the local cell, and transmit the interference signal of the local cell to a filtering unit;
and the filtering unit is used for receiving the interference signal of the cell from the calculating unit and filtering the interference signal of the cell by utilizing the received signal of the cell to obtain a useful signal of the cell.
In a specific implementation of the first aspect of the present application:
the calculation unit includes:
a transfer function determining module, configured to obtain transfer functions of two cells on an active frequency band of a local cell according to signals of the neighboring cell on the active frequency band of the local cell and signals of the neighboring cell on the active frequency band of the local cell, and transmit the transfer functions to an interference signal calculating module;
and the interference signal calculation module is used for receiving the transfer function from the transfer function determination module and calculating the interference signal of the cell by using the transfer function.
The transfer function determination module includes:
a first determining module, configured to divide a signal of the neighboring cell on an active frequency band of the local cell by a signal of the neighboring cell on the active frequency band of the local cell to obtain the transfer function.
The transfer function determination module includes:
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 the active frequency band of the local cell and a signal of the neighboring cell on the active frequency band of the local cell.
The transfer function determination module includes:
and a third determining module, configured to obtain the transfer function by using a Minimum Mean Square Error (MMSE) algorithm according to a signal of the neighboring cell on the active frequency band of the cell and a signal of the active frequency band of the cell.
According to the embodiment of the application, the interference signal of the cell is calculated according to the received signal of the adjacent cell, so that the interference signal of the cell can be obtained without the number of interference sources, and the problem that the interference cannot be effectively eliminated under the conditions that the number of antennas is limited and the number of the interference sources is not limited is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart illustrating a method for canceling an interference signal according to an embodiment of the present application;
fig. 2 is a flowchart illustrating another interference signal cancellation method according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an intra-cell antenna and reference channel distribution according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram illustrating processing of received signals in each receiving antenna in a cell according to an embodiment of the present disclosure;
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 flowchart illustrating another interference signal cancellation method according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another intra-cell antenna and reference channel distribution disclosed in the embodiment of the present application;
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 will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application discloses a method for eliminating interference signals, which refers to fig. 1:
s101: and acquiring the received signal of the adjacent cell to obtain the signal of the received signal of the adjacent cell on the activated frequency band of the cell.
S102: and calculating the interference signal of the cell according to the signal of the adjacent cell on the active frequency band of the cell and the signal on the active frequency band of the cell.
S103: and filtering the interference signal of the cell by using the received signal of the cell to obtain the useful signal of the cell.
According to the embodiment of the application, the interference signal of the cell is calculated according to the received signal of the adjacent cell, so that the interference signal of the cell can be obtained without the number of interference sources, and the problem that the interference cannot be effectively eliminated under the conditions that the number of antennas is limited and the number of the interference sources is not limited is solved.
Referring to fig. 2, a flowchart of an embodiment of an interference signal cancellation method according to the present application is shown.
Acquiring the received signals of the neighboring cells, and acquiring the signals of the received signals of the neighboring cells on the active frequency band of the cell, where the embodiment takes calculating the interference signal of the cell through the received signals of all the neighboring cells as an example for explanation, the embodiment includes:
s201: and acquiring the received signals of the adjacent cells to obtain the signals of the received signals of all the adjacent cells on the activated frequency band of the cell.
In the following, a cellular network is taken as an example, and it is understood that the present embodiment is not limited to the cellular network. The 3 cells in the cellular network are cells respectively1，cell2，cell3Using all and cells1Cell calculation and cancellation of received signals of neighboring cells1Stem of (5)And (4) disturbing the signal.
cell1，cell2，cell3Receiving antennas are arranged in the cell, and received signals received by the antennas in each cell are full-band signals. cell1、cell2And cell3All the full frequency bands of the received signal are f1-f8The activated frequency band and the non-activated frequency band of each cell can be extracted by using a subcarrier extraction method such as Fast Fourier Transform (FFT) algorithm or adaptive filtering algorithm, wherein the cell1Has an active frequency band of fi，cell2Has an active frequency band of fi，cell3Has an active frequency band of fkI, j and k are any natural number from 1 to 8, and i is not equal to j not equal to k. Only the signal on the active frequency band of each cell is a useful signal, the signals on other frequency bands are interference signals, and the cell is used1For example, that is, a cell1Two receiving antennas a in1And A2Received are received signals which are a mixture of desired signals and interfering signals, wherein for a cell1In other words, the received signal is only at fiUseful signals are on the frequency band, and interference signals are on other frequency bands; for a cell2、cell3In particular, a cell2、cell3In a cell1Active frequency band f ofiOnly the interfering signal is present. cell2、cell3And cell1Similarly, except that the cell2In fjUseful signals are on the frequency band, and interference signals are on other frequency bands; cell2In fkThe frequency band is a useful signal, and the other frequency bands are interference signals, which are not described herein.
Referring to fig. 3:
cell1with two receiving antennas A therein1And A2And two reference channels RA1And RA2；
cell2With two receiving antennas B therein1And B2And two reference channels RB1And RB2；
cell3With two receiving antennas C therein1And C2And two reference channels RC1And RC2。
The received signal is received by receiving antennas in a cell, each receiving antenna divides the received signal into two paths after passing through a filter and an LNA (Low Noise Amplifier), one path enters a baseband processing Unit (BBU) for processing through an intermediate frequency, and the other path (as shown in the lower half of the block diagram in fig. 4) is used as an input of a reference channel corresponding to the other path. With a receiving antenna A2For example, the receiving antenna A2One path of the received signal enters a baseband processing unit (BBU) for processing, and the other path of the received signal is input to a receiver (R)C2Sequentially passes through RC2The filter, LNA, the intermediate frequency enter the baseband processing unit BBU after being processed, the receiving antenna in each cell receives the signal of the full frequency band, but the BBU only processes the signal on the active frequency band of the cell, and after the signals of other cells are introduced, the signals of the inactive frequency band can be obtained because the active frequency bands of different cells are different. Obtaining all and cells1Inputting the input signal of the cell by the adjacent cell, and acquiring all the cells in the input signal1Neighboring cell is in cell1Activating the signal on the frequency band, wherein the signal is only the interference signal, and the input signal is the cell2、cell3The receive signal of the antenna.
By analogy, the receiving antennas of the three sectors and the corresponding reference channels thereof can be connected, and the connection relationship between the receiving antennas and the corresponding reference channels thereof is shown in table 1:
TABLE 1
| Receiving antenna A1 | Reference channel RB2 |
| Receiving antenna A2 | Reference channel RC2 |
| Receiving antenna B1 | Reference channel RA2 |
| Receiving antennaB2 | Reference channel RC1 |
| Receiving antenna C1 | Reference channel RA1 |
| Receiving antenna C2 | Reference channel RB1 |
S202: and obtaining the transfer function of the two cells on the active frequency band of the cell according to the signal of the adjacent cell on the active frequency band of the cell and the signal of the active frequency band of the cell.
Specifically, a signal of the adjacent cell on the active frequency band of the cell is an interference signal, a signal of the adjacent cell on the active frequency band of the cell is a mixed signal of a useful signal and an interference signal, a transfer function between the two cells is obtained according to the interference signal of the adjacent cell on the active frequency band of the cell and the mixed signal on the active frequency band of the cell, and the interference signal of the cell is extracted by using the transfer function.
No matter whether the interference source is a single interference source or multiple interference sources, the received signals of two adjacent cells only have the difference in amplitude and phase on the same frequency band, so after the received signals of two adjacent cells are obtained, as long as the received signals of two adjacent cells only have the difference in amplitude and phase on the same frequency band, the interference signal of the cell can be obtained through the signals of the adjacent cells on the activated frequency band of the cell. The transfer function is a function related to the amplitude difference and the phase difference of two adjacent cells in the same frequency band.
The generation of the transfer function is described in detail below.
A. The signal of the adjacent cell on the active frequency band of the cell is divided by the signal of the active frequency band of the cell to obtain the transfer function.
1. Transfer function between two cells in the monophonic condition direct path scenario:
the single tone condition is that only one frequency band exists, the transfer function and the frequency band have no relation, and the transfer function under the frequency band is only needed to be solved; the direct path condition is that the signals directly arrive without passing through a scatterer between a transmitter and an antenna, the transmitter is used for transmitting the signals, and the antenna is used for receiving the signals;
YRX1(f)=D(f)·X(f);
YRX2(f)=gD·exp(-j·θD)D(f)·X(f);
YRX3(f)=g′D·exp(-j·θ′D)D(f)·X(f)
wherein:
YRX1(f) representing a cell1Activating frequency band f in local celliA signal on;
YRX2(f) representing a cell2In a cell1Active frequency band fiA signal on;
YRX3(f) representing a cell3In a cell1Active frequency band fiA signal on;
d (f) represents a transmitter-to-antenna transfer matrix;
x (f) represents a transmission signal of the transmitter;
gDrepresenting a cell1And cell2In a cell1Active frequency band fiThe amplitude difference of the signal on;
j represents the imaginary part of the real number;
θDrepresenting a cell1And cell2In a cell1Active frequency band fiThe phase difference of the signals on;
H21representing a cell1And cell2In a cell1Active frequency band fiThe transfer function of (c).
H31Representing a cell1And cell3In a cell1Active frequency band fiTransfer function of
g′DRepresenting a cell1And cell3In a cell1Active frequency band fiThe amplitude difference of the signal on;
θ'Drepresenting a cell1And cell3In a cell1Active frequency band fiThe phase difference of the signals above.
2. Transfer function between two cells under a scattering path scene:
in the scattering diameter scene, signals of a transmitter reach an antenna after passing through a scattering body, and only one path reaches the antenna after passing through the scattering body.
Wherein, YRX1' (f) denotes a cell1Activating frequency band f in local celliA signal on;
YRX2' (f) denotes a cell2In a cell1Active frequency band fiA signal on;
YRX3' (f) denotes a cell3In a cell1Active frequency band fiA signal on;
b (f) represents a transfer matrix between scatterers;
t (f) represents the transmitter to scatterer transfer matrix;
x' (f) represents a transmission signal of the transmitter;
s (f) represents a transfer matrix between the scatterers to the antennas;
i represents an identity matrix;
gRrepresenting a cell1And cell2In a cell1Active frequency band fiThe amplitude difference of the signal on;
θRrepresenting a cell1And cell2In a cell1Active frequency band fiThe phase difference of the signals on;
g′Rrepresenting a cell1And cell3In a cell1Active frequency band fiThe amplitude difference of the signal on;
θ′Rrepresenting a cell1And cell3In a cell1Active frequency band fiThe phase difference of the signals above.
3. Transfer functions between two cells under other non-one main path scenes:
in this scenario, multiple paths are used between the antenna and the transmitter, some of which are achieved directly without passing through the scatterer, and some of which are achieved after passing through the scatterer.
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Wherein:
YRX1"(f) denotes a cell1Activating frequency band f in local celliA signal on;
YRX2"(f) denotes a cell2In a cell1Active frequency band fiA signal on;
s' (f) represents a transfer matrix between the scatterer to the antenna;
g″Rrepresenting a cell1And cell2In a cell1Active frequency band fiThe amplitude difference of the signal on the optical path due to the direct path;
θ″Drepresenting a cell1And cell2In a cell1Active frequency band fiThe phase difference of the signals on the optical path due to the direct path;
g' represents a cell1And cell2In a cell1Active frequency band fiThe amplitude difference of the signal on the optical fiber due to the scattering path;
θ″Rrepresenting a cell1And cell2In a cell1Active frequency band fiPhase difference of signals on the optical fiber due to scattering paths;
g represents a cell1And cell2In a cell1Active frequency band fiThe amplitude difference between the signals on;
phi denotes a cell1And cell2In a cell1Active frequency band fiThe phase difference between the signals on.
In summary, under the three scenarios, the following can be obtained:
cell1and cell2In a cell1Active frequency band fiThe transfer function above is:
h21(f)=g21exp(-jφ21)；
wherein:
g21representing a cell1And cell2In a cell1Active frequency band fiThe amplitude difference between the upper signals;
φ21representing a cell1And cell2In a cell1Active frequency band fiThe phase difference between the upper signals.
Accordingly, the cell1And cell3In a cell1Active frequency band fiThe transfer function above is:
h31(f)=g31exp(-jφ31)；
wherein:
g31representing a cell1And cell3In a cell1Active frequency band fiThe amplitude difference between the upper signals;
φ31representing a cell1And cell3In a cell1Active frequency band fiThe amplitude difference between the upper signals; .
B. And obtaining the transfer function by utilizing a Least Mean Square (LMS) algorithm according to the signals of the adjacent cells on the active frequency band of the cell and the signals of the active frequency band of the cell.
YRX1″′(f)=H1X1+I1+N1
YRX2″′(f)=H2X2+I2+N2
YRX3″′(f)=H3X3+I3+N3
Wherein:
YRXi"(f) indicates that the ith cell activates the frequency band f in the celliOf the signal (c).
HiIs the channel coefficient of the ith cell;
Xiis a useful signal source of the ith cell;
Iiis the interference of the ith cell;
Niis the noise of the ith cell; wherein i =1, 2, 3.
Because in the cell1The active band of the cell has both interference signals and useful signals2And cell3In the cell1Only interference signals exist in the active frequency band, therefore, the least mean square LMS algorithm can be used to find the optimal W so that
S.T|W1|=1。
Or,
S.T|W2|=1；
wherein, W1Is a cell1And cell2In a cell1Active frequency band fiThe transfer function of (a);
W2is a cell1And cell3In a cell1Active frequency band fiThe transfer function of (c).
C. And obtaining the transfer function by using a Minimum Mean Square Error (MMSE) algorithm according to the signals of the adjacent cells on the activated frequency band of the cell and the signals of the activated frequency band of the cell.
Selecting a proper cost function, selecting and utilizing an interference decision method to obtain the best W value, and estimating the weighted values of three cells:
S.T|W1|＝1。
or,
S.T|W′2|=1。
wherein, W1' is a cell1And cell2In a cell1Active frequency band fiThe transfer function of (a);
W2' is a cell1And cell3In a cell1Active frequency band fiThe transfer function of (c).
S203: the interference signal of the cell is calculated by using the transfer function, and referring to fig. 5:
antenna A1The interference signals above are: h is311*RA1+h212*RA2，；
Antenna A2The interference signals above are: h is312*RA1+h211*RA2；
Wherein:
h311is a cell3Antenna C in1Receive signal and antenna A in1In a cell1Active frequency band fiThe transfer function of (a);
h212is a cell2Antenna B in2Receive signal and antenna A in1In a cell1Active frequency band fiThe transfer function of (a);
h312is a cell3Antenna C in2Receive signal and antenna A in2In a cell1Active frequency band fiThe transfer function of (a);
h211is a cell2Antenna B in1Receive signal and antenna A in2In a cell1Active frequency band fiThe transfer function of (a);
RA1is a cell3Antenna C in1Input to the cell1In RA1In the reference channel and in the cell1Active frequency band fiA signal on;
RA2is a cell2Antenna B in1Input to the cell1In RA2In the reference channel and in the cell1Active frequency band fiOf the signal (c).
Or,
antenna A1The interference signals above are: w21*RA1+W12*RA2；
Antenna A2The interference signals above are: w22*RA1+W11*RA2；
Wherein:
W21is a cell3Antenna C in1Receive signal and antenna A in1In a cell1Active frequency band fiThe transfer function of (a);
W12is a cell2Antenna B in2Receive signal and antenna A in1In a cell1Active frequency band fiThe transfer function of (a);
W22is a cell3Antenna C in2Receive signal and antenna A in2In a cell1Active frequency band fiThe transfer function of (a);
W11is a cell2Antenna B in1Receive signal and antenna A in2In a cell1Active frequency band fiThe transfer function of (a);
RA1is a cell3Antenna C in1Input to the cell1In RA1In the reference channel and in the cell1Active frequency band fiA signal on;
RA2is a cell2Antenna B in1Input to the cell1In RA2In the reference channel and in the cell1Active frequency band fiOnA signal.
Or,
antenna A1The interference signals above are: w'21*RA1+W′12*RA2；
Antenna A2The interference signals above are: w'22*RA1+W′11*RA2；
Wherein:
W′21is a cell3Antenna C in1Receive signal and antenna A in1In a cell1Active frequency band fiThe transfer function of (a);
W′12is a cell2Antenna B in2Receive signal and antenna A in1In a cell1Active frequency band fiThe transfer function of (a);
W′22is a cell3Antenna C in2Receive signal and antenna A in2In a cell1Active frequency band fiThe transfer function of (a);
W′11is a cell2Antenna B in1Receive signal and antenna A in2In a cell1Active frequency band fiThe transfer function of (a);
RA1is a cell3Antenna C in1Input to the cell1In RA1In the reference channel and in the cell1Active frequency band fiA signal on;
RA2is a cell2Antenna B in1Input to the cell1In RA2In the reference channel and in the cell1Active frequency band fiOf the signal (c).
S204: and filtering the interference signal of the cell by using the received signal of the cell to obtain the useful signal of the cell.
A1Useful signal = a1Receiving signal-A1An interference signal;
A2useful signal = a2Receiving signal-A1An interfering signal.
Referring to fig. 6, a flowchart of an embodiment of an interference signal cancellation method according to the present application is shown.
Acquiring a received signal of an adjacent cell, and acquiring a signal of the received signal of the adjacent cell on an active frequency band of the local cell, where this embodiment takes calculating an interference signal of the local cell by using received signals of a part of adjacent cells as an example for description, where the received signals of the part of adjacent cells may be: the signal with the largest power on the active frequency band of the 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: and acquiring the received signal of the adjacent cell, acquiring the signal with the maximum power of the received signal of the adjacent cell on the activated frequency band of the cell, and calculating the interference signal of the cell according to the signal with the maximum power.
In the following, a cellular network is taken as an example, and 3 cells in the cellular network are cells respectively1，cell2，cell3By using cell2，cell3Receiving signals in two cells in a cell1Active frequency band f ofiCalculating and eliminating cell of signal with maximum upper power1Of the interference signal.
And acquiring received signals input into the cell by all adjacent cells, selecting the signal with the maximum power on the active frequency band of the cell, and acquiring the signal with the maximum power.
Referring to fig. 7:
cell1with receiving antenna A therein3And two reference channels RA1And RA2；
cell2With receiving antenna B therein3And two reference channels RB1And RB2；
cell3With receiving antenna C therein3And two reference channels RC1And RC2。
The receiving signals are received by receiving antennas in a cell, each receiving antenna divides the received signals into two paths after passing through a filter and an LNA, one path enters a baseband processing unit BBU through intermediate frequency for processing, and the other path is used as the input of a reference channel corresponding to the other path. With a receiving antenna A1For example, one path of the signal received by the receiving antenna a1 enters the baseband processing unit BBU for processing, and the other path of the signal is respectively input to the reference channel RB2And a reference channel RC2And respectively pass through the reference channel R in turnB2And a reference channel RC2The intermediate frequency enters a baseband processing unit BBU after being processed by the filter, the LNA and the intermediate frequency.
By analogy, the receiving antennas of the three sectors and the corresponding reference channels thereof can be connected, and the connection relationship between the receiving antennas and the corresponding reference channels thereof is shown in table 2:
TABLE 2
| Receiving antenna A3 | Reference channel RB2And a reference channel RC2 |
| Receiving antenna B3 | Reference channel RA2And a reference channel RC1 |
| Receiving antenna C3 | Reference channel RA1And a reference channel RB1 |
By cell1For example, obtain RA1Reference channel and RA2Selecting a cell with reference to the signal in the channel1Active frequency band fiUp to the signal of maximum power, i.e. selecting RA1Reference channel and RA2In-cell in reference channel1Active frequency band fiObtaining the signal with the maximum power by using the signal with the maximum power, wherein the signal with the maximum power is also the following: the neighboring cell interferes with the signal with the largest power on the active frequency of the cell.
S302: and obtaining the transfer function of the two cells on the active frequency band of the cell according to the signal with the maximum power and the signal on the active frequency band of the cell.
After obtaining the signal with the maximum power, obtaining the signal with the maximum power and the receiving antenna a according to the method obtained by the transfer function in the step S1023On a cell1Of the active band ofX。
hX=gXexp(-jφX)；
Wherein, gXFor the signal and receiving antenna A with the maximum power3On a cell1The amplitude difference over the active band;
φXfor the signal and receiving antenna A with the maximum power3On a cell1Of the active frequency band.
S303: and calculating the interference signal of the cell by using the transfer function.
Antenna A3The interference signals above are: y isX(f)gXexp(-jφX)；
S304: the interference signal is filtered from the received signal in the local cell to obtain the useful signal of the local cell.
The useful signals of the cell are: y is1(f)-YX(f)gXexp(-jφX)
Wherein, Y1(f) Representing a cell1Activating frequency band f in local celliA signal on;
YX(f) indicating that the signal with the maximum power is in the cell1Active frequency band f ofiOf the signal (c).
It should be noted that, in each of the above embodiments, the number of the receiving antennas arranged in each cell is not limited to the number in the embodiment, and may also be multiple, which is not described herein.
Corresponding to the embodiment of the invention, the embodiment of the application also provides a device for eliminating the interference signal.
Referring to fig. 8, the apparatus includes:
an acquiring unit 801, configured to acquire a received signal of an adjacent cell, obtain a signal of the received signal of the adjacent cell on an active frequency band of the local cell, and transmit the signal of the received signal of the adjacent cell on the active frequency band of the local cell to a computing unit;
a calculating unit 802, configured to receive, from the obtaining unit, a signal of the received signal of the neighboring cell on an active frequency band of the local cell, calculate 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 of the active frequency band of the local cell, and transmit the interference signal of the local cell to a filtering unit;
a filtering unit 803, configured to receive the interference signal of the local cell from the computing 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 calculating unit includes:
a transfer function determining module, configured to obtain transfer functions of two cells on an active frequency band of a local cell according to signals of the neighboring cell on the active frequency band of the local cell and signals of the neighboring cell on the active frequency band of the local cell, and transmit the transfer functions to an interference signal calculating module;
and an interference signal calculation module, configured to receive the transfer function from the transfer function determination module, and calculate an interference signal of the local cell by using the transfer function.
Further, the transfer function determining module includes:
a first determining module, configured to divide a signal of the neighboring cell in an active frequency band of the local cell by a signal of the neighboring cell in the active frequency band of the local cell to obtain the transfer function.
Further, the transfer function determining module includes:
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 in an active frequency band of the local cell and a signal of the neighboring cell in the active frequency band of the local cell.
Further, the transfer function determining module includes:
and a third determining module, configured to obtain the transfer function by using a Minimum Mean Square Error (MMSE) algorithm according to a signal of the neighboring cell on the active frequency band of the local cell and a signal of the neighboring cell on the active frequency band of the local cell.
According to the embodiment of the application, the interference signal of the cell is calculated according to the received signal of the adjacent cell, so that the interference signal of the cell can be obtained without knowing the number of the interference sources, and the problem that the interference cannot be effectively eliminated under the conditions of limited number of antennas and uncertain number of the interference sources is solved.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present application.
Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
It will be understood by those skilled in the art that all or part of the processing in the method of the above embodiments may be implemented by hardware that is instructed to be associated with a program, and the program may be stored in a computer-readable storage medium.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for canceling an interference signal, comprising:
acquiring a receiving signal of an adjacent cell to obtain a signal of the receiving signal of the adjacent cell on an activated frequency band of the cell;
calculating the interference signal of the cell according to the signal of the adjacent cell on the active frequency band of the cell and the signal of the active frequency band of the cell;
and 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.
2. The method according to claim 1, wherein the calculating the interference signal of the local cell based on the signal of the neighboring cell on the active frequency band of the local cell and the signal of the local cell on the active frequency band of the local cell comprises: obtaining transfer functions of two cells on the active frequency band of the cell according to the signals of the adjacent cells on the active frequency band of the cell and the signals of the active frequency band of the cell;
and calculating the interference signal of the cell by using the transfer function.
3. The method of claim 2, wherein the obtaining the transfer function of the two cells on the active band of the cell comprises:
and dividing the signal of the adjacent cell on the activated frequency band of the cell with the signal of the activated frequency band of the cell to obtain the transfer function.
4. The method of claim 2, wherein the obtaining the transfer function of the two cells on the active band of the cell comprises:
and obtaining the transfer function by utilizing a Least Mean Square (LMS) algorithm according to the signals of the adjacent cells on the active frequency band of the cell and the signals of the adjacent cells on the active frequency band of the cell.
5. The method of claim 2, wherein the obtaining the transfer function of the two cells on the active band of the cell comprises:
and obtaining the transfer function by using a Minimum Mean Square Error (MMSE) algorithm according to the signals of the adjacent cells on the activated frequency band of the cell and the signals of the activated frequency band of the cell.
6. An apparatus for canceling an interference signal, comprising:
an acquiring unit, configured to acquire a received signal of an adjacent cell, obtain a signal of the received signal of the adjacent cell on an active frequency band of a local cell, and transmit the signal of the received signal of the adjacent cell on the active frequency band of the local cell to a computing unit;
a calculating unit, configured to receive, from the obtaining unit, a signal of the received signal of the neighboring cell on the active frequency band of the local cell, calculate 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 of the active frequency band of the local cell, and transmit the interference signal of the local cell to a filtering unit;
and the filtering unit is used for receiving the interference signal of the cell from the calculating unit and filtering the interference signal of the cell by utilizing the received signal of the cell to obtain a useful signal of the cell.
7. The apparatus of claim 6, wherein the computing unit comprises:
a transfer function determining module, configured to obtain transfer functions of two cells on an active frequency band of a local cell according to signals of the neighboring cell on the active frequency band of the local cell and signals of the neighboring cell on the active frequency band of the local cell, and transmit the transfer functions to an interference signal calculating module;
and the interference signal calculation module is used for receiving the transfer function from the transfer function determination module and calculating the interference signal of the cell by using the transfer function.
8. The apparatus of claim 7, wherein the transfer function determining module comprises:
a first determining module, configured to divide a signal of the neighboring cell on an active frequency band of the local cell by a signal of the neighboring cell on the active frequency band of the local cell to obtain the transfer function.
9. The apparatus of claim 7, wherein the transfer function determining module comprises:
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 the active frequency band of the local cell and a signal of the neighboring cell on the active frequency band of the local cell.
10. The apparatus of claim 7, wherein the transfer function determining module comprises:
and a third determining module, configured to obtain the transfer function by using a Minimum Mean Square Error (MMSE) algorithm according to a signal of the neighboring cell on the active frequency band of the cell and a signal of the active frequency band of the cell.
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| CN106941679A (en) * | 2016-01-04 | 2017-07-11 | 中兴通讯股份有限公司 | A kind of base station and its method for realizing signal transacting |
| WO2018090206A1 (en) * | 2016-11-15 | 2018-05-24 | 华为技术有限公司 | Interference suppression method and apparatus |
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| KR100426623B1 (en) * | 2001-12-22 | 2004-04-13 | 한국전자통신연구원 | Apparatus and Method for Receiver for Cancelling Interference Pilot Signals from Neighboring Basestations |
| CN102480444B (en) * | 2010-11-23 | 2014-12-10 | 中兴通讯股份有限公司 | Method and corresponding system for broadband co-frequency interference noise estimation and interference suppression |
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| CN1874189B (en) * | 2006-06-29 | 2011-12-21 | 上海宣普实业有限公司 | Method and device for concurrent eliminating same frequency interference in TDS-CDMA |
| CN101697622A (en) * | 2009-11-03 | 2010-04-21 | 天津理工大学 | Methods for eliminating intra-cell interference and inter-cell interference in TD-SCDMA system |
| CN102638800A (en) * | 2012-03-19 | 2012-08-15 | 华为技术有限公司 | Method and device for eliminating same-frequency interference |
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| CN106941679A (en) * | 2016-01-04 | 2017-07-11 | 中兴通讯股份有限公司 | A kind of base station and its method for realizing signal transacting |
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