CN102647387B - The removing method of co-channel interference and device - Google Patents
The removing method of co-channel interference and device Download PDFInfo
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- CN102647387B CN102647387B CN201210100543.1A CN201210100543A CN102647387B CN 102647387 B CN102647387 B CN 102647387B CN 201210100543 A CN201210100543 A CN 201210100543A CN 102647387 B CN102647387 B CN 102647387B
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Abstract
The embodiment of the invention discloses a kind of removing method and device of co-channel interference, the method comprises: on time-frequency domain, select at least two regions; Calculate the interference autocorrelation matrix in each region at least two regions; According to the interference autocorrelation matrix in each region judge co-channel interference there is situation after, in the interference autocorrelation matrix at least two regions obtain one interference autocorrelation matrix; Carry out interference to received signal by the interference autocorrelation matrix obtained to eliminate.The calculating of the embodiment of the present invention owing to selecting at least two regions to carry out disturbing autocorrelation matrix on time-frequency domain, therefore current co-channel interference situation can be obtained by comparing, the selection disturbing autocorrelation matrix is carried out according to comparative result, the accuracy of interference autocorrelation matrix can be improved with this, for being subject to the different Received signal strength of co-channel interference degree, by selecting the interference autocorrelation matrix obtaining being applicable to, thus the error of interference elimination can be reduced.
Description
Technical field
The present invention relates to communication technical field, particularly the removing method of co-channel interference and device.
Background technology
At LTE (the Long Term Evolution that 3GPP proposes, Long Term Evolution) in, adopt MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) technology and OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology communicate.When descending transmission data, different user in same community realizes multiple access by taking different subcarriers, but the user of neighbor cell may use same frequency band to carry out transfer of data, now may produce co-channel interference between neighbor cell, reduce the reliability of data communication.
In prior art, in order to suppress the co-channel interference between neighbor cell, first a region can be selected on time-frequency domain, time domain in time-frequency domain comprises several OFDM symbol of continuous print, frequency domain comprises several subcarriers of continuous print, secondly the interference autocorrelation matrix in the region selected by calculating in all pilot point, get the interference autocorrelation matrix estimated value of mean value as symbols all in this region of above-mentioned all interference autocorrelation matrixes, carry out interference to received signal by this autocorrelation matrix estimated value and eliminate.
If the region selected on time-frequency domain is less, then in region, the sample number of pilot point is less, and the interference autocorrelation matrix estimated value thus calculated is accurate not; If the region selected on time-frequency domain is comparatively large, then in this region, the value of interference channel is more big changes, if now all Received signal strength use same interference autocorrelation matrix estimated value matrix to remove interference, has comparatively big error.
Summary of the invention
Embodiments provide a kind of removing method and device of co-channel interference, eliminate time error comparatively greatly to solve existing co-channel interference, accurate not problem.
In order to solve the problems of the technologies described above, the embodiment of the invention discloses following technical scheme:
A removing method for co-channel interference, comprising:
Time-frequency domain is selected at least two regions;
Calculate the interference autocorrelation matrix in each region at least two regions;
According to the interference autocorrelation matrix in each region judge co-channel interference there is situation after, in the interference autocorrelation matrix at least two regions obtain one interference autocorrelation matrix;
Carry out interference to received signal by the interference autocorrelation matrix obtained to eliminate.
A cancellation element for co-channel interference, comprising:
Selected cell, for selecting at least two regions on time-frequency domain;
Computing unit, for calculating the interference autocorrelation matrix in each region at least two regions;
Acquiring unit, for judge according to the interference autocorrelation matrix in each region co-channel interference there is situation after, in the interference autocorrelation matrix at least two regions obtain one interference autocorrelation matrix;
Eliminate unit, carry out interference to received signal for the interference autocorrelation matrix by obtaining and eliminate.
As can be seen from the above-described embodiment, the embodiment of the present invention selects at least two regions on time-frequency domain, calculate the interference autocorrelation matrix in each region at least two regions, according to the interference autocorrelation matrix in each region judge co-channel interference there is situation after, in the interference autocorrelation matrix at least two regions, obtain an interference autocorrelation matrix, carry out interference to received signal by the interference autocorrelation matrix obtained and eliminate.The calculating of the embodiment of the present invention owing to selecting at least two regions to carry out disturbing autocorrelation matrix on time-frequency domain, therefore current co-channel interference situation can be obtained by comparing, the selection disturbing autocorrelation matrix is carried out according to comparative result, the accuracy of interference autocorrelation matrix can be improved with this, for being subject to the different Received signal strength of co-channel interference degree, by selecting the interference autocorrelation matrix obtaining being applicable to, thus the error of interference elimination can be reduced.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the communication construction schematic diagram of the LTE system based on MIMO;
Fig. 2 is the first embodiment flow chart of the removing method of co-channel interference of the present invention;
Fig. 3 A is the second embodiment flow chart of the removing method of co-channel interference of the present invention;
Fig. 3 B is the schematic diagram of selected zone on a kind of time-frequency domain;
Fig. 4 is a kind of schematic diagram obtaining interference autocorrelation matrix;
Fig. 5 is the embodiment block diagram of the cancellation element of co-channel interference of the present invention;
Fig. 6 is the embodiment block diagram of computing unit in Fig. 5;
Fig. 7 is the embodiment block diagram of acquiring unit in Fig. 5;
Fig. 8 is the embodiment block diagram eliminating unit in Fig. 5.
Embodiment
The following embodiment of the present invention provides a kind of removing method and device of co-channel interference.
Technical scheme in the embodiment of the present invention is understood better in order to make those skilled in the art person, and enable the above-mentioned purpose of the embodiment of the present invention, feature and advantage become apparent more, below in conjunction with accompanying drawing, technical scheme in the embodiment of the present invention is described in further detail.
Before the detailed description embodiment of the present invention, first the communication system that the embodiment of the present invention is applied is described.
See Fig. 1, the communication construction schematic diagram for a kind of LTE system based on MIMO:
In Fig. 1, transmitter and receiver all has multiple antenna, and suppose that transmitter has T bar transmitting antenna, receiver has R bar reception antenna, then the model of the receiver received signal formula that can be expressed as:
Y＝HX+U
In above formula, the burst that X launches for transmitter, X=[x
1, x
2... x
t]
t, wherein x
iit is the signal that i-th antenna sends; The signal vector that corresponding receiver receives is Y=[y
1, y
2... y
r]
t.U=[u
1, u
2... u
r]
t, U represent other base station to the interference of base station, present receiving machine place and noise and.H is that R × T ties up channel matrix, represent transmit through the characteristic of channel of channel.As the autocorrelation matrix R of U
uu=E (UU
h) not diagonal matrix, represent that Received signal strength exists co-channel interference, then need filtering to received signal, to remove the correlation of interference.
See Fig. 2, the first embodiment flow chart for the removing method of co-channel interference of the present invention:
Step 201: select at least two regions on time-frequency domain.
In a communications system, for each region selected, the time domain in time-frequency domain comprises several OFDM symbol of continuous print, frequency domain comprises several subcarriers of continuous print, each region contains the pilot point of some Received signal strength on time-frequency domain.In the present embodiment, preferably, time-frequency domain selects two regions, is respectively first area and second area, the number of the pilot point comprised in these two regions is different.For first area and second area, can select in conjunction with actual emulation result according to certain criterion.
Such as, a kind of selection criterion is: first area needs to ensure that the interference autocorrelation matrix estimated according to this first area can judge the existence with or without co-channel interference, when the pilot point number in region is more, more easily judge without co-channel interference, when the pilot point number in region is less, more easily sentence into and have co-channel interference, the occurrence of the pilot point number N1 therefore comprised in first area can obtain in conjunction with the emulation of real system, preferably, the pilot point number N1=48 in this first area; Second area needs to ensure that the interference autocorrelation matrix estimated according to this second area can judge the speed situation that co-channel interference changes, when the pilot point number in second area is fewer, then more can reflect the change of co-channel interference, therefore the N2 occurrence in second area emulates in systems in practice and obtains, preferably, the pilot point number N2=16 in this second area.
Step 202: the interference autocorrelation matrix calculating each region at least two regions.
Concrete, obtain each pilot point in each region, calculate the interference autocorrelation matrix of each pilot point in each region, in cumulative each region, the interference autocorrelation matrix of all pilot point obtains accumulation result, and the mean value of being tried to achieve relative at least two regions by accumulation result is as the interference autocorrelation matrix in each region.
Step 203: according to the interference autocorrelation matrix in each region judge co-channel interference there is situation after, in the interference autocorrelation matrix at least two regions obtain one interference autocorrelation matrix.
Still to select first area and second area on time-frequency domain, the pilot point number wherein in first area is greater than the pilot point number in second area.Concrete, when judging that the first interference coefficient correlation calculated according to the first interference autocorrelation matrix of first area is not more than the first default thresholding, determine that Received signal strength does not exist co-channel interference, by un-hero's line element zero setting of the first interference autocorrelation matrix, and using the interference autocorrelation matrix of the first interference autocorrelation matrix after zero setting as described acquisition; When judging that the second interference coefficient correlation calculated according to the second interference autocorrelation matrix of second area is not less than the second default thresholding, determine that Received signal strength exists co-channel interference, using the second interference autocorrelation matrix as the interference autocorrelation matrix obtained; When judgement second disturbs coefficient correlation in the first thresholding and the second thresholding limited range, determine that Received signal strength exists co-channel interference, using the first interference autocorrelation matrix as the interference autocorrelation matrix obtained.
Step 204: carry out interference to received signal by the interference autocorrelation matrix obtained and eliminate.
Concrete, Cholesky decomposition is carried out to the interference autocorrelation matrix obtained and obtains inferior triangular flap, carry out filtering process to received signal by the inverse matrix of this inferior triangular flap, the signal after the interference that is eliminated.The process of being carried out interference elimination by the interference autocorrelation matrix obtained to received signal can be consistent with prior art, do not repeat them here.
See Fig. 3 A, be the second embodiment flow chart of the removing method of co-channel interference of the present invention, this embodiment, to obtain two regions on time-frequency domain, describes the elimination process of co-channel interference in detail:
Step 301: select first area and second area on time-frequency domain, the pilot point number wherein in second area is less than the pilot point number in first area.
For first area and second area, can select in conjunction with actual emulation result according to certain criterion.Such as, a kind of selection criterion is: first area needs to ensure that the interference autocorrelation matrix estimated according to this first area can judge the existence with or without co-channel interference, when the pilot point number in region is more, more easily judge without co-channel interference, when the pilot point number in region is less, more easily sentence into and have co-channel interference, the occurrence of the pilot point number N1 therefore comprised in first area can obtain in conjunction with the emulation of real system, preferably, the pilot point number N1=48 in this first area; Second area needs to ensure that the interference autocorrelation matrix estimated according to this second area can judge the speed situation that co-channel interference changes, when the pilot point number in second area is fewer, then more can reflect the change of co-channel interference, therefore the N2 occurrence in second area emulates in systems in practice and obtains, preferably, the pilot point number N2=16 in this second area.
See Fig. 3 B, be the schematic diagram of selected zone on a kind of time-frequency domain, wherein time domain comprise several OFDM symbol of continuous print, frequency domain comprises several subcarriers of continuous print.R0 on time-frequency domain represents pilot point, and it is 16 that the pilot tone wherein comprised in first area is counted, and it is 4 that the pilot tone comprised in second area is counted.
Step 302: obtain the pilot point in each region.
According to the example of step 301, after time-frequency domain have selected first area and second area, the pilot point number got in first area is 16, and the pilot point number in second area is 4.
Step 303: the interference autocorrelation matrix calculating each pilot point in each region.
In this step, the account form of the interference autocorrelation matrix of each pilot point is consistent with prior art, does not repeat them here.
Step 304: in cumulative each region all pilot point interference autocorrelation matrix after, using the interference autocorrelation matrix of the mean value of accumulation result as this region.
Wherein, using the first interference autocorrelation matrix of the mean value after the interference autocorrelation matrix of pilot point all in first area adds up as first area; Mean value after the interference autocorrelation matrix of pilot point all in second area adds up is disturbed autocorrelation matrix as second of second area.
Step 305: judge whether the first interference coefficient correlation calculated according to the first interference autocorrelation matrix of first area is not more than the first default thresholding, if so, then performs step 306; Otherwise, perform step 307.
Wherein, the element comprised in first interference autocorrelation matrix of first area show respectively on the area, the interference power of different reception antenna, and the interference cross correlation value between antenna, the first interference coefficient correlation can be calculated according to above-mentioned element, such as, for the receiver having two antennas, then the first interference coefficient correlation can be defined as interference cross correlation value between two antennas square with the ratio of two antenna interference power products.First thresholding can obtain according to the emulation of communication system, and for the communication system with different antennae number, its first threshold value can be different, and for two antenna communication systems, preferably, this first threshold value can value be 0.1.
Step 306: determine that Received signal strength does not exist co-channel interference, using the matrix after un-hero's line element zero setting of the first interference autocorrelation matrix as the interference autocorrelation matrix of described selection, performs step 310.
When the first interference coefficient correlation is not more than the first default thresholding, can confirm that Received signal strength does not exist co-channel interference, directly using the interference autocorrelation matrix of the matrix after un-hero's line element zero setting of the first interference autocorrelation matrix as described selection, then perform step 310 and carry out interference elimination.
Step 307: judge whether the second interference coefficient correlation calculated according to the second interference autocorrelation matrix of second area is not less than the second default thresholding, if so, then performs step 308; Otherwise, perform step 309.
Wherein, the element comprised in second interference autocorrelation matrix of second area show respectively on the area, the interference power of different reception antenna, and the interference cross correlation value between antenna, the second interference coefficient correlation can be calculated according to above-mentioned element, such as, for the receiver having two antennas, then the second interference coefficient correlation can be defined as interference cross correlation value between two antennas square with the ratio of two antenna interference power products.Second thresholding can obtain according to the emulation of communication system, and for the communication system with different antennae number, its second threshold value can be different, and for two antenna communication systems, preferably, this first threshold value can value be 0.05.
Step 308: determine that Received signal strength exists co-channel interference, using the second interference autocorrelation matrix as the interference autocorrelation matrix selected, performs step 310.
When the second interference coefficient correlation is not less than the second default thresholding, can confirm that Received signal strength exists co-channel interference, directly using the interference autocorrelation matrix of the second interference autocorrelation matrix as described selection, then perform step 310 and carry out interference elimination.
Step 309: determine that Received signal strength exists co-channel interference, using the first interference autocorrelation matrix as the interference autocorrelation matrix selected.
When the second interference coefficient correlation is between the first thresholding and the second thresholding, then confirms that Received signal strength exists co-channel interference, directly disturb autocorrelation matrix as selected interference autocorrelation matrix using first.
Step 310: Cholesky decomposition is carried out to the interference autocorrelation matrix obtained and obtains inferior triangular flap.
Step 311: carry out filtering process to received signal by the inverse matrix of inferior triangular flap, the signal after the interference that is eliminated.
Carrying out the process of co-channel interference elimination for the ease of describing the present invention in detail, having two reception antennas for receiver below, describe one and undertaken disturbing the embody rule example eliminated by selecting two regions on time-frequency domain.
Shown in composition graphs 3B, time-frequency domain selects two regions, and the pilot point number wherein in first area is 16, and the pilot point number in second area is 4.
If in each region selected, the reception data Y of each pilot point
p=[y
1, p, y
2, p]
t, the channel response of pilot point is H
p=[h
1, p, h
2, p]
t, pilot point signal X
p=[x
1, p, x
2, p]
t, wherein, for the first area selected, p=1 .., N1, for the second area p=1 selected .., N2.
Because pilot point Received signal strength is known, therefore channel response can be obtained by channel estimating, if the interference on two reception antennas is U
p=[u
1, p, u
2, p]
t, then first U is calculated
pinterior each element:
u
1，p＝y
1，p-h
1，px
1，p
u
2，p＝y
2，p-h
2，px
2，p
Then, the interference autocorrelation matrix R of each pilot point is calculated
uu, p:
R
uu，p＝U
pU
p H
Finally in accumulative each region all pilot point interference autocorrelation matrix and be averaged, obtain first area and the first interference autocorrelation matrix R1 and second interference autocorrelation matrix R2 corresponding to second area, as follows respectively:
Wherein R
1 uu, prepresent the interference autocorrelation matrix calculated according to the pilot point in first area, R
2 uu, mrepresent the interference autocorrelation matrix calculated according to the pilot point in second area.See Fig. 4, it is a kind of schematic diagram being obtained above-mentioned interference autocorrelation matrix by computer program.
Suppose that the element of the first interference autocorrelation matrix R1 and the second interference autocorrelation matrix R2 calculated is as follows:
Wherein, R1
11represent the interference power on the reception antenna 1 that calculates according to first area, R1
22represent the interference power on the reception antenna 2 that calculates according to first area, R1
12represent the interference cross correlation value on the reception antenna 1 and reception antenna 2 that calculate according to first area; R2
11represent the interference power on the reception antenna 1 that calculates according to second area, R2
22represent the interference power on the reception antenna 2 that calculates according to second area, R2
12represent the interference cross correlation value on the reception antenna 1 and reception antenna 2 that calculate according to second area.
Defining the first interference coefficient correlation calculated according to first area is | R1
12|
2/ (R1
11r1
22), defining the second interference coefficient correlation calculated according to second area is | R1
12|
2/ (R1
11r1
22).Carry out the judgement of co-channel interference according to above-mentioned two interference coefficients and disturb the selection course of autocorrelation matrix as follows:
If | R1
12|
2/ (R1
11r1
22) be less than or equal to the first threshold value of setting, then for there is not co-channel interference in judgement, now cross correlation value can be disturbed to set to 0 in the interference autocorrelation matrix calculated according to first area, interference power values is constant, the value of the first thresholding is preferably 0.1 according to simulation result, the interference autocorrelation matrix namely now obtained
If | R1
12|
2/ (R1
11r1
22) be greater than the first default threshold value, then adjudicating as there is co-channel interference, judging finally to select R1 or R2 as interference autocorrelation matrix according to the interference autocorrelation matrix R2 of second area further.Now, if | R2
12|
2/ (R2
11r2
22) being more than or equal to the second default threshold value, the value of the second thresholding is preferably 0.05 according to simulation result, then the interference autocorrelation matrix obtained
If | R2
12|
2/ (R2
11r2
22) be less than the second default threshold value, then the interference autocorrelation matrix obtained
Corresponding with the embodiment of the removing method of co-channel interference of the present invention, present invention also offers the embodiment of the cancellation element of co-channel interference.
See Fig. 5, the embodiment block diagram for the cancellation element of co-channel interference of the present invention:
The cancellation element of this co-channel interference comprises: selected cell 510, computing unit 520, acquiring unit 530 and elimination unit 540.
Wherein, selected cell 510, for selecting at least two regions on time-frequency domain;
Computing unit 520, for calculating the interference autocorrelation matrix in each region at least two regions;
Acquiring unit 530, for judge according to the interference autocorrelation matrix in each region co-channel interference there is situation after, in the interference autocorrelation matrix at least two regions obtain one interference autocorrelation matrix;
Eliminate unit 540, carry out interference to received signal for the interference autocorrelation matrix by obtaining and eliminate.
See Fig. 6, the embodiment block diagram for the computing unit in Fig. 5:
This computing unit 520 comprises:
Pilot point obtains subelement 521, for obtaining each pilot point in each region;
Autocorrelation matrix computation subunit 522, for calculating the interference autocorrelation matrix of each pilot point in each region;
Cumulative mean computation subunit 523, obtains accumulation result for the interference autocorrelation matrix of all pilot point in cumulative each region, and the mean value of being tried to achieve relative at least two regions by accumulation result is as the interference autocorrelation matrix in described each region.
See Fig. 7, be the embodiment block diagram of acquiring unit in Fig. 5, in this embodiment, suppose to select single 510 on time-frequency domain, select first area and second area, the pilot point number in described second area is less than the pilot point number in described first area; Described acquiring unit 530 comprises:
First coefficient judgment sub-unit 531, for judging whether the first interference coefficient correlation calculated according to the first interference autocorrelation matrix of described first area is not more than the first default thresholding;
First obtains subelement 532, for when the judged result of described first coefficient judgment sub-unit 531 is for being, determine that described Received signal strength does not exist co-channel interference, by un-hero's line element zero setting of described first interference autocorrelation matrix, and using the interference autocorrelation matrix of the first interference autocorrelation matrix after zero setting as described acquisition;
Second coefficient judgment sub-unit 533, for when the judged result of described first coefficient judgment sub-unit 531 is no, judge whether the second interference coefficient correlation calculated according to the second interference autocorrelation matrix of described second area is not less than the second default thresholding;
Second obtains subelement 534, for when described second coefficient judgment sub-unit judge 533 results as being time, determine that described Received signal strength exists co-channel interference, using the interference autocorrelation matrix of described second interference autocorrelation matrix as described acquisition, and, when the judged result of described second coefficient judgment sub-unit 533 is no, determine that described Received signal strength exists co-channel interference, using the interference autocorrelation matrix of described first interference autocorrelation matrix as described acquisition.
See Fig. 8, for eliminating the embodiment block diagram of unit in Fig. 5:
This elimination unit 540 comprises:
Matrix decomposition subelement 541, obtains inferior triangular flap for carrying out Cholesky decomposition to the interference autocorrelation matrix obtained;
Subelement 542 is eliminated in interference, carries out filtering process for the inverse matrix by described inferior triangular flap to described Received signal strength, the signal after the interference that is eliminated.
As seen from the above-described embodiment, the embodiment of the present invention selects at least two regions on time-frequency domain, calculate the interference autocorrelation matrix in each region at least two regions, according to the interference autocorrelation matrix in each region judge co-channel interference there is situation after, in the interference autocorrelation matrix at least two regions, obtain an interference autocorrelation matrix, carry out interference to received signal by the interference autocorrelation matrix obtained and eliminate.The calculating of the embodiment of the present invention owing to selecting at least two regions to carry out disturbing autocorrelation matrix on time-frequency domain, therefore current co-channel interference situation can be obtained by comparing, the selection disturbing autocorrelation matrix is carried out according to comparative result, the accuracy of interference autocorrelation matrix can be improved with this, for being subject to the different Received signal strength of co-channel interference degree, by selecting the interference autocorrelation matrix obtaining being applicable to, thus the error of interference elimination can be reduced.
Those skilled in the art can be well understood to the mode that technology in the embodiment of the present invention can add required general hardware platform by software and realize.Based on such understanding, technical scheme in the embodiment of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a removing method for co-channel interference, is characterized in that, comprising:
Time-frequency domain is selected at least two regions;
Calculate the interference autocorrelation matrix in each region at least two regions; In described calculating at least two regions, the interference autocorrelation matrix in each region comprises: obtain each pilot point in each region; Calculate the interference autocorrelation matrix of each pilot point in each region; In cumulative each region, the interference autocorrelation matrix of all pilot point obtains accumulation result, and the mean value of being tried to achieve relative at least two regions by accumulation result is as the interference autocorrelation matrix in described each region;
According to the interference autocorrelation matrix in each region judge co-channel interference there is situation after, in the interference autocorrelation matrix at least two regions obtain one interference autocorrelation matrix;
Carry out interference to received signal by the interference autocorrelation matrix obtained to eliminate.
2. method according to claim 1, is characterized in that, described at least two regions comprise first area and second area, and the pilot point number in described second area is less than the pilot point number in described first area.
3. method according to claim 2, is characterized in that, the described interference autocorrelation matrix according to each region judge co-channel interference there is situation after, in the interference autocorrelation matrix at least two regions obtain one interference autocorrelation matrix comprise:
When judging that the first interference coefficient correlation calculated according to the first interference autocorrelation matrix of described first area is not more than the first default thresholding, determine that described Received signal strength does not exist co-channel interference, by un-hero's line element zero setting of described first interference autocorrelation matrix, and using the interference autocorrelation matrix of the first interference autocorrelation matrix after zero setting as described acquisition;
When judging that the second interference coefficient correlation calculated according to the second interference autocorrelation matrix of described second area is not less than the second default thresholding, determine that described Received signal strength exists co-channel interference, using the interference autocorrelation matrix of described second interference autocorrelation matrix as described acquisition;
When judging that described second interference coefficient correlation is in the scope that described first thresholding and the second thresholding limit, determine that described Received signal strength exists co-channel interference, using the interference autocorrelation matrix of described first interference autocorrelation matrix as described acquisition.
4. method according to claim 1, is characterized in that, the described interference autocorrelation matrix by obtaining carries out interference elimination to received signal and comprises:
Cholesky decomposition is carried out to the interference autocorrelation matrix obtained and obtains inferior triangular flap;
By the inverse matrix of described inferior triangular flap, filtering process is carried out to described Received signal strength, the signal after the interference that is eliminated.
5. a cancellation element for co-channel interference, is characterized in that, comprising:
Selected cell, for selecting at least two regions on time-frequency domain;
Computing unit, for calculating the interference autocorrelation matrix in each region at least two regions; Described computing unit comprises:
Pilot point obtains subelement, for obtaining each pilot point in each region; Autocorrelation matrix computation subunit, for calculating the interference autocorrelation matrix of each pilot point in each region; Cumulative mean computation subunit, obtains accumulation result for the interference autocorrelation matrix of all pilot point in cumulative each region, and the mean value of being tried to achieve relative at least two regions by accumulation result is as the interference autocorrelation matrix in described each region;
Acquiring unit, for judge according to the interference autocorrelation matrix in each region co-channel interference there is situation after, in the interference autocorrelation matrix at least two regions obtain one interference autocorrelation matrix;
Eliminate unit, carry out interference to received signal for the interference autocorrelation matrix by obtaining and eliminate.
6. device according to claim 5, is characterized in that, described at least two regions comprise first area and second area, and the pilot point number in described second area is less than the pilot point number in described first area.
7. device according to claim 6, is characterized in that, described acquiring unit comprises:
First coefficient judgment sub-unit, for judging whether the first interference coefficient correlation calculated according to the first interference autocorrelation matrix of described first area is not more than the first default thresholding;
First obtains subelement, for when the judged result of described first coefficient judgment sub-unit is for being, determine that described Received signal strength does not exist co-channel interference, by un-hero's line element zero setting of described first interference autocorrelation matrix, and using the interference autocorrelation matrix of the first interference autocorrelation matrix after zero setting as described acquisition;
Second coefficient judgment sub-unit, for when the judged result of described first coefficient judgment sub-unit is no, judges whether the second interference coefficient correlation calculated according to the second interference autocorrelation matrix of described second area is not less than the second default thresholding;
Second obtains subelement, for when the judged result of described second coefficient judgment sub-unit is for being, determine that described Received signal strength exists co-channel interference, using the interference autocorrelation matrix of described second interference autocorrelation matrix as described acquisition, and, when the judged result of described second coefficient judgment sub-unit is no, determine that described Received signal strength exists co-channel interference, using the interference autocorrelation matrix of described first interference autocorrelation matrix as described acquisition.
8. device according to claim 5, is characterized in that, described elimination unit comprises:
Matrix decomposition subelement, obtains inferior triangular flap for carrying out Cholesky decomposition to the interference autocorrelation matrix obtained;
Subelement is eliminated in interference, carries out filtering process for the inverse matrix by described inferior triangular flap to described Received signal strength, the signal after the interference that is eliminated.
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| CN103107826B (en) * | 2013-02-26 | 2014-10-22 | 海能达通信股份有限公司 | Multi-time-slot transceiver and method for avoiding same frequency interference thereof |
| GB2511865B (en) * | 2013-03-15 | 2015-07-01 | Aceaxis Ltd | Processing interference in a wireless network |
| CN103731384A (en) * | 2013-12-19 | 2014-04-16 | 华为技术有限公司 | Method and device for suppressing interference |
| CN104753545B (en) * | 2013-12-30 | 2019-02-15 | 中兴通讯股份有限公司 | A kind of IF process method, apparatus and base station |
| CN103987062B (en) * | 2014-04-16 | 2017-06-27 | 华为技术有限公司 | Receive the interference elimination method and device of signal |
| CN103997473B (en) * | 2014-05-13 | 2017-10-17 | 华为技术有限公司 | A kind of filtering method and relevant apparatus of signal interference |
| CN103986562B (en) * | 2014-06-04 | 2017-09-12 | 华为技术有限公司 | Suppress the method and apparatus of co-channel interference |
| CN105429920B (en) * | 2015-10-28 | 2018-09-04 | 扬智科技股份有限公司 | The detection method and its detection circuit of shared channel interference |
| CN112468194B (en) * | 2019-09-06 | 2023-04-07 | 中兴通讯股份有限公司 | Method and device for generating offset signal, base station and storage medium |
| CN113556301B (en) * | 2020-04-24 | 2023-01-10 | 大唐移动通信设备有限公司 | Signal processing method and device |
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| CN101133562A (en) * | 2005-08-08 | 2008-02-27 | 中兴通讯股份有限公司 | Method for suppressing signal interference of user in adjacent cell |
| CN102104562A (en) * | 2009-12-17 | 2011-06-22 | 中兴通讯股份有限公司 | Multi-antenna interference rejection combining method and device |
| CN102324960A (en) * | 2011-05-13 | 2012-01-18 | 中兴通讯股份有限公司 | Interference suppression merging method and receiver |
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| CN101133562A (en) * | 2005-08-08 | 2008-02-27 | 中兴通讯股份有限公司 | Method for suppressing signal interference of user in adjacent cell |
| CN102104562A (en) * | 2009-12-17 | 2011-06-22 | 中兴通讯股份有限公司 | Multi-antenna interference rejection combining method and device |
| CN102324960A (en) * | 2011-05-13 | 2012-01-18 | 中兴通讯股份有限公司 | Interference suppression merging method and receiver |
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