CN102163990A - Multi-user interference elimination method and base station - Google Patents

Multi-user interference elimination method and base station Download PDF

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CN102163990A
CN102163990A CN201010119467XA CN201010119467A CN102163990A CN 102163990 A CN102163990 A CN 102163990A CN 201010119467X A CN201010119467X A CN 201010119467XA CN 201010119467 A CN201010119467 A CN 201010119467A CN 102163990 A CN102163990 A CN 102163990A
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interference
midamble
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user
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CN102163990B (en
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殷玮玮
马毅华
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Shanghai Zhongxing Software Co Ltd
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ZTE Corp
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Abstract

The invention discloses a multi-user interference elimination method and a base station. The method comprises the following steps that: the base station reconstructs a midamble interference signal according to a frequency offset value of an interfering user; and the base station eliminates the reconstructed midamble interference signal from a received midamble signal to obtain the interference-eliminated midamble signal. By the method and the base station, the accuracy of interference signal reconstruction is improved, and the accuracy of subsequent frequency offset estimation is further improved.

Description

Multi-user interference eliminating method and base station
Technical field
The present invention relates to the communications field, in particular to a kind of multi-user interference eliminating method and base station.
Background technology
In mobile radio system, because base station and terminal are in the state of relative motion, therefore the signal that receives has Doppler frequency shift, and particularly under the high speed scene, this frequency displacement is especially obvious.Doppler frequency shift can influence up access success rate, handover success rate, also can the capacity and the covering of system be exerted an influence.Therefore, base station and terminal must be carried out frequency departure estimation and compensation, could satisfy operation quality requirement.
Frequency offset estimating algorithm in the correlation technique utilizes known training sequence, for example, TD SDMA (Time Division-Synchronous Code Division MultipleAccess, abbreviate TD-SCDMA as) midamble sign indicating number in the system, do relevant by sending sequence with receiving sequence, obtain the phase place deflection of receiving sequence, thus the frequency deviation of obtaining.
In the TD-SCDMA system, because a plurality of users are code division multiplexings, therefore the midamble sign indicating number that receives is the result after a plurality of users midamble sequence separately superposes through channel.Therefore, how from received signal, to isolate each user's signal, and then to carry out frequency offset estimating respectively be a stubborn problem.
Utilize each user's signal impulse response to reconstruct each user's reception midamble sequence in the correlation technique, utilize interference elimination method again, the midamble signal of other users in the received signal is eliminated, obtain treating the midamble receiving sequence of estimating user, and carry out frequency offset estimating with this sequence.
Though above interference elimination method can be eliminated the midamble received signal of interference user, but interference signal has frequency deviation in real system, especially under the situation of at a high speed big frequency deviation, the interference signal phase place rotation that frequency deviation causes be can not ignore, said method has been ignored the frequency deviation value of interference user, must bring the error of reconstruct interference signal, and then also can influence the precision of frequency offset estimating.
Summary of the invention
Main purpose of the present invention is to provide a kind of multi-user interference eliminating method and base station, to address the above problem.
One aspect of the present invention provides a kind of multi-user interference eliminating method, may further comprise the steps: the base station is according to the frequency deviation value reconstruct midamble interference signal of interference user; And the midamble interference signal of reconstruct is eliminated in the base station from the midamble signal that receives, the midamble signal after the interference that is eliminated.
Preferably, the base station comprises according to the frequency deviation value reconstruct midamble interference signal of interference user: the midamble interference signal b of i interference user correspondence is calculated in the base station i=b I, 1, b I, 2... b I, jB I, b-l, wherein, b i , j = a i , j × e - 2 π × f ‾ d × ( j - 64.5 ) / 1280000 , Be the frequency deviation value of i interference user, a I, jIt is the predetermined interference signal of having given up the part chip that is disturbed by the data symbol multipath, the midamble interference signal of frequency deviation value influence that predetermined interference signal has been ignoring of i interference user correspondence, j=1,2, b-l, b are the length of midamble sequence, and l is the quantity of part chip, i=1,, N, N are the quantity of interference user.
Preferably, predetermined interference signal a ‾ i = h i * m ‾ i , Wherein, h iBe the channel impulse response of i interference user, * calculates convolution,
Figure GSA00000026396100024
It is the midamble sequence of i interference user correspondence.
Preferably, the base station midamble interference signal of eliminating reconstruct from the midamble signal that receives comprises: the midamble signal of eliminating after disturbing is calculated in the base station r ′ = r - Σ i = 1 N b i , Wherein, r is the midamble signal that the base station receives.
Preferably, eliminate after the midamble interference signal of reconstruct from the midamble signal that receives the base station, also comprises: frequency offset estimating is carried out to the midamble signal of eliminating after disturbing in the base station, obtains the frequency deviation value of active user at current time.
Preferably, the midamble signal after disturb elimination the base station carries out frequency offset estimating and comprises: frequency offset estimating is carried out to the midamble signal of eliminating after disturbing in the base station, obtains the instantaneous frequency deviation f of active user at current time m, and to f mSmoothly obtain the frequency deviation rough estimate result of current time
Figure GSA00000026396100032
Adopt the base station
Figure GSA00000026396100033
The base station is compensated the data-signal after being compensated at the data-signal that current time receives; Frequency offset estimating is carried out to the data-signal after compensating in the base station, obtains the active user at the thin estimated result f of the frequency deviation of current time d, and to f dCarry out smoothly obtaining the frequency deviation value of active user at current time
Preferably, to f mSmoothly comprise: calculate f m ‾ = f ‾ m * × ( 1 - p ) + f m × p , Wherein,
Figure GSA00000026396100036
Be last one constantly Value, and f ‾ m * ( 0 ) = 0 , P is a smoothing factor, 0=＜p＜=1.
Preferably, to f dSmoothly comprise: calculate f d ‾ = f ‾ d * × ( 1 - p ) + f d × p , Wherein,
Figure GSA000000263961000310
Be last one constantly
Figure GSA000000263961000311
Value, and f ‾ d * ( 0 ) = 0 , P is a smoothing factor, 0=＜p＜=1.
Preferably, the frequency deviation value of interference user is an interference user at last one constantly frequency deviation value, perhaps, is the frequency deviation value of interference user at current time.
Another aspect of the present invention provides a kind of base station, comprising: disturb reconstructed module, be used for the frequency deviation value reconstruct midamble interference signal according to interference user; Interference cancellation module is used for from the midamble interference signal of the midamble signal elimination reconstruct that receives, the midamble signal after the interference that is eliminated.
By the present invention, in the reconstruct interference signal, consider the influence of frequency deviation value, solved the bigger problem of interference signal error of reconstruct in the correlation technique, improve the accuracy of interference signal reconstruct, and then improved the accuracy of follow-up frequency offset estimating.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structured flowchart according to the base station of the embodiment of the invention;
Fig. 2 is the detailed block diagram according to the base station of the embodiment of the invention;
Fig. 3 is the flow chart according to the multi-user interference eliminating method of the embodiment of the invention;
Fig. 4 is the multi-user interference elimination of the example 1 according to the present invention and the flow chart of frequency offset estimation procedure; And,
Fig. 5 is the multi-user interference elimination of the example 2 according to the present invention and the flow chart of frequency offset estimation procedure.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
At first introduce structure according to a kind of base station of the embodiment of the invention, can improve the reconstruction accuracy of interference signal by this base station, and then improve the precision of frequency offset estimating, Fig. 1 is the structured flowchart according to the base station of the embodiment of the invention, as shown in Figure 1, this base station comprises:
Disturb reconstructed module 12, be used for frequency deviation value reconstruct midamble interference signal according to interference user;
Interference cancellation module 14 is used for from the midamble interference signal of the midamble signal elimination reconstruct that receives, the midamble signal after the interference that is eliminated.
Particularly, as shown in Figure 2, above-mentioned interference reconstructed module 12 can comprise: first computing unit 22 is used for calculating a ‾ i = h i * m ‾ i , Wherein, h iBe the channel impulse response of i interference user, * calculates convolution,
Figure GSA00000026396100052
Be the midamble sequence of i interference user correspondence, i=1 ..., N, N are the quantity of interference user;
Chip selected cell 24 is used to give up
Figure GSA00000026396100053
In preceding l chip being disturbed by the data symbol multipath, obtain a I, 1, a I, 2... a I, b-l, wherein, b is the length of midamble sequence;
Second computing unit 26 is used for calculating b i , j = a i , j × e - 2 π × f ‾ d × ( j - 64.5 ) / 1280000 , Obtain the interference midamble signal b of i interference user correspondence i=b I, 1, b I, 2... b I, b-l, wherein, j=1,2 ..., b-l,
Figure GSA00000026396100055
It is the frequency deviation value of i interference user.
Above-mentioned base station may further include frequency deviation estimating modules 28, is used for the midamble signal after the interference eliminated is carried out frequency offset estimating, obtains the frequency deviation value of active user at current time.
According to embodiments of the invention, a kind of multi-user interference eliminating method also is provided, Fig. 3 is the flow chart according to the multi-user interference eliminating method of the embodiment of the invention, as shown in Figure 3, this method may further comprise the steps:
Step S302, the base station is according to the frequency deviation value reconstruct midamble interference signal of interference user; And,
Step S304, the midamble interference signal of reconstruct is eliminated in the base station from the midamble signal that receives, the midamble signal after the interference that is eliminated.
Consider that the interference signal reconstruction accuracy that causes owing to the reconstruct of influence of frequency deviation not being included in interference signal in the correlation technique is low, and then cause the bigger problem of frequency offset estimating error, the method that the embodiment of the invention provides is brought the frequency deviation of interference user into reconstruct when interference eliminated, taken into full account the influence of frequency deviation, thereby improved the precision of reconstruct signal.
Preferably, step S302 comprises: the midamble interference signal b of i interference user correspondence is calculated in the base station i=b I, 1, b I, 2... b I, jB I, b-l, wherein, b i , j = a i , j × e - 2 π × f ‾ d × ( j - 64.5 ) / 1280000 ,
Figure GSA00000026396100062
Be the frequency deviation value of i interference user, a I, jBe the predetermined interference signal of having given up the part chip that is disturbed by the data symbol multipath, predetermined interference signal has been ignoring of i interference user correspondence the midamble interference signal of frequency deviation value influence (that is the interference signal that adopts the interference signal reconstructing method in the correlation technique to produce), j=1,2 ..., b-l, b is the length of midamble sequence, l is the quantity of part chip, i=1 ... N, N are the quantity of interference user.
In this process, given up the part chip that is disturbed by the data symbol multipath, make result of calculation more accurate.
The calculating formula of above-mentioned predetermined interference signal is: a ‾ i = h i * m ‾ i , Wherein, h iBe the channel impulse response of i interference user, * calculates convolution,
Figure GSA00000026396100064
It is the midamble sequence of i interference user correspondence.Above h iCan obtain by channel estimation method of the prior art, concrete acquisition mode does not repeat them here.
Preferably, step S304 specifically comprises: the midamble signal of eliminating after disturbing is calculated in the base station r ′ = r - Σ i = 1 N b i , Wherein, r is the midamble signal that the base station receives.Preferably, interference user can be in current area, and other users' except the active user is part or all of.
Preferably, after the step S304, also comprise: frequency offset estimating is carried out to the midamble signal of eliminating after disturbing in the base station, obtains the frequency deviation value of active user at current time.Signal after the elimination that obtains by above-mentioned interference elimination method is disturbed has higher accuracy, and therefore, it is also more accurate that the signal after above elimination disturbed carries out the frequency offset estimation result that frequency offset estimating obtains.
In said process, the process that the midamble signal after disturb elimination the base station carries out frequency offset estimating can may further comprise the steps:
1, frequency offset estimating is carried out to the midamble signal of eliminating after disturbing in the base station, obtains the instantaneous frequency deviation f of active user at current time m, and to f mSmoothly obtain the frequency deviation rough estimate result of current time
Figure GSA00000026396100071
Particularly, to f mSmoothly comprise: calculate f m ‾ = f ‾ m * × ( 1 - p ) + f m × p , Wherein, Be last one constantly
Figure GSA00000026396100074
Value, and f ‾ m * ( 0 ) = 0 (that is, establish at initial time f ‾ m = 0 ), p is a smoothing factor, 0=＜p＜=1.
2, adopt the base station
Figure GSA00000026396100077
The base station is compensated the data-signal after being compensated at the data-signal that current time receives.
3, frequency offset estimating is carried out to the data-signal after compensating in the base station, obtains the active user at the thin estimated result f of the frequency deviation of current time d, and to f dCarry out smoothly obtaining the frequency deviation value of active user at current time
Figure GSA00000026396100078
Particularly, to f dSmoothly comprise: calculate f d ‾ = f ‾ d * × ( 1 - p ) + f d × p , Wherein,
Figure GSA000000263961000710
Be last one constantly
Figure GSA000000263961000711
Value, and f ‾ d * ( 0 ) = 0 (that is, establish at initial time f ‾ d = 0 ), p is a smoothing factor, 0=＜p＜=1.
Because the length of midamble sequence is shorter, therefore utilize midamble to estimate that the arithmetic accuracy of frequency deviation is relatively poor, must consider the method for further noise reduction.Based on this, the embodiment of the invention is done smoothing processing for the instantaneous frequency deviation value that the midamble sequencal estimation goes out, utilize the strong correlation of the frequency deviation value that the continuous period of the day from 11 p.m. to 1 a.m carves, reduce the influence of noise, improve the precision of estimating frequency offset estimation result by temporal smothing filtering.
Preferably, the frequency deviation value of above interference user can perhaps, also can be the frequency deviation value of interference user at current time for the frequency deviation value of interference user in a last moment.Particularly:
If active user's interference user has adopted said method to carry out interference eliminated and frequency offset estimating, then the active user can adopt interference user to carry out interference eliminated and frequency offset estimating at the frequency deviation value of current time, and in this case, result of calculation is more accurate;
If active user's interference user does not adopt said method to carry out interference eliminated and frequency offset estimating as yet, then the active user can adopt interference user to carry out interference eliminated and frequency offset estimating at the frequency deviation value in a last moment, though the result of calculation that result of calculation does not in this case go up under a kind of situation is accurate, but, frequency deviation correlation in time is higher, bring historical frequency deviation value into interference signal reconstruct, also can obtain more accurate interference signal and be used for interference eliminated.
Need to prove that the notion in the moment described above can be specially frame, subframe, time slot or the like.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Example 1
This case description to the parallel process of carrying out interference eliminated and frequency offset estimating of each user.Fig. 4 is the flow chart of the interference eliminated and the frequency offset estimation procedure of the example 1 according to the present invention, and as shown in Figure 4, said process mainly may further comprise the steps:
Step S401, the base station is frequency deviation value of each user storage, the initial time frequency deviation value is made as 0, in this example, frequency deviation value is left in the frequency deviation register, but be not limited thereto.
Step S402, the base station utilizes reception midamble sign indicating number to carry out channel estimating, obtains each user's channel impulse response h respectively;
Step S403 utilize each user's the channel impulse response and the midamble sequence of correspondence, and the frequency deviation value in the frequency deviation register reconstructs the midamble signal that all users arrive base station side simultaneously.Wherein i user's restructuring procedure is specific as follows:
1) by the reconstruct received signal as a result of channel estimating be: a ‾ i = h i * m ‾ i , H wherein iBe i user's channel impulse response, Be i user's midamble sequence, length is 144 (are b=144, but are not limited thereto), and * is a convolution;
2) give up 16 chips that may be disturbed by the data symbol multipath front (that is, l=16, but be not limited thereto), take out
Figure GSA00000026396100093
Next 128 chips (that is, b-l=144-16=128), can obtain a I, 1, a I, 2... a I, 128
3) after the adding frequency deviation, 128 reception midamble chip signal that obtain i user are: b i , j = a i , j × e - 2 π × f ‾ d × ( j - 64.5 ) / 1280000 , J=1 wherein, 2 ..., 128,
Figure GSA00000026396100095
Be the frequency deviation value in the frequency deviation register;
Step S404, order waits to estimate that other users beyond the frequency deviation user are interference user, and all users are carried out interference eliminated simultaneously, obtains all users' the reception midamble sequence that is used for frequency offset estimating.That is, the signal of eliminating after disturbing is r ′ = r - Σ k ∈ K i b k , Wherein r is the midamble signal after a plurality of user's stacks that receive, K iBe i user's interference user set, b kIt is k user's calculating in previous step reconstruction signal;
Step S405 carries out frequency offset estimating by the midamble sequence r ' after the interference eliminated, obtains instantaneous value f m
Step S406 is to f mDo smoothly, that is, f ‾ m ( n ) = f ‾ m ( n - 1 ) × ( 1 - p ) + f m ( n ) × p , Wherein n represents subframe numbers (be example with the subframe in this example, subframe is the notion in moment of describing among the corresponding embodiment),
Figure GSA00000026396100098
Be the smooth value after the last one midamble estimation constantly, f ‾ m ( 0 ) = 0 ; P ∈ [0,1] is a smoothing factor.In this step, the formula that also can adopt other is to f mDo level and smooth.
Step S407 is with the result of midamble sign indicating number rough estimate
Figure GSA00000026396100102
Data portion compensates, and carefully estimates accurate instantaneous frequency deviation f with the data after the compensation d
Step S408 is to f dCarry out smoothly obtaining
Figure GSA00000026396100103
Promptly f ‾ d ( n ) = f ‾ d ( n - 1 ) × ( 1 - p ) + f d ( n ) × p . Wherein
Figure GSA00000026396100105
Be the smooth value after a last moment using the data estimation frequency deviation, f ‾ d ( 0 ) = 0 ; P ∈ [0,1] is a smoothing factor.In this step, the formula that also can adopt other is to f dDo level and smooth.
Step S409, the frequency deviation value that upgrades in the frequency deviation register is
In this example, the frequency deviation value that adopts when interference eliminated and frequency offset estimating are handled is the frequency deviation value in a moment, owing to adopted parallel processing, therefore, the computational speed of this mode is very fast.
Example 2
This case description the process of interference eliminated and frequency offset estimating is carried out in each user's serial.Fig. 5 is the flow chart of the interference eliminated and the frequency offset estimation procedure of the example 2 according to the present invention, and as shown in Figure 5, said process mainly may further comprise the steps:
Step S501, the base station is frequency deviation value of each user storage, the initial time frequency deviation value is made as 0, in this example, frequency deviation value is left in the frequency deviation register, but be not limited thereto.
Step S502, the base station utilizes reception midamble sign indicating number to carry out channel estimating, obtains each user's channel impulse response h respectively;
Step S503 to all user's orderings, carries out interference eliminated and frequency offset estimating according to user's power order from big to small to the user according to the watt level order;
Step S504 treats its interference user signal of process user reconstruct, the same S403 of detailed process;
Step S505, interference eliminated obtains treating the reception midamble signal that is used for frequency offset estimating of estimating user r ′ = r - Σ k ∈ K b k , Wherein r is the midamble signal after a plurality of user's stacks that receive, and K is the interference user set for the treatment of estimating user, b kIt is k user's calculating in previous step reconstruction signal;
Step S506 carries out frequency offset estimating by the midamble sequence after the interference eliminated, obtains instantaneous value f m
Step S507 is to f mDo smoothly, promptly f ‾ m ( n ) = f ‾ m ( n - 1 ) × ( 1 - p ) + f m ( n ) × p , Wherein n represents subframe numbers,
Figure GSA00000026396100113
Be the smooth value after the last one midamble estimation constantly, f ‾ m ( 0 ) = 0 ; P ∈ [0,1] is a smoothing factor; In this step, the formula that also can adopt other is to f mDo level and smooth.
Step S508 is with the result of midamble sign indicating number rough estimate
Figure GSA00000026396100115
Data portion compensates, and carefully estimates accurate instantaneous frequency deviation f with the data after the compensation d
Step S509 is to f dCarry out smoothly obtaining Promptly f ‾ d ( n ) = f ‾ d ( n - 1 ) × ( 1 - p ) + f d ( n ) × p . Wherein Be the smooth value after a last moment using the data estimation frequency deviation, f ‾ d ( 0 ) = 0 ; P ∈ [0,1] is a smoothing factor; In this step, the formula that also can adopt other is to f dDo level and smooth.
Step S510 upgrades in the frequency deviation register and treats that the frequency deviation value of estimating user is
Figure GSA000000263961001110
Step S511 gets next user in the sequencing queue for treating estimating user.Forward S504 to.
Different with example 1 is, in this example during interference signal reconstruct, when interference user come treat estimating user before the time, this that can utilize interference user (promptly, present frame) frequency offset estimating value, the frequency offset estimation accuracy of this mode is higher, but execution speed is slower.
In above embodiment, the process that the signal that utilizes after eliminating carries out frequency offset estimating after eliminating, interference signal has also been described, results estimated is applied to again in next time the interference eliminated, and this method can improve the precision of frequency offset estimating and interference eliminated significantly.Even so, those skilled in the art should understand that, even the method for considering the frequency deviation influence in the process of interference signal reconstruct that the embodiment of the invention provides is used in conjunction with existing frequency deviation estimating method, still has the effect that improves the interference eliminated precision preferably.
In sum, the multi-user interference cancellation scheme that the embodiment of the invention provides has improved the accuracy of interference signal reconstruct, and then has improved the accuracy of follow-up frequency offset estimating.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a multi-user interference eliminating method is characterized in that, may further comprise the steps:
The base station is according to the frequency deviation value reconstruct midamble interference signal of interference user; And,
The midamble interference signal of described reconstruct is eliminated in described base station from the midamble signal that receives, the midamble signal after the interference that is eliminated.
2. method according to claim 1 is characterized in that, described base station comprises according to the described midamble interference signal of described frequency deviation value reconstruct of described interference user:
The described midamble interference signal b of i described interference user correspondence is calculated in described base station i=b I, 1, b I, 2... b I, jB I, b-l,
Wherein, b i , j = a i , j × e - 2 π × f ‾ d × ( j - 64.5 ) / 1280000 ,
Figure FSA00000026396000012
Be the described frequency deviation value of i described interference user, a I, jIt is the predetermined interference signal of having given up the part chip that is disturbed by the data symbol multipath, described predetermined interference signal has been ignoring of i the described interference user correspondence midamble interference signal of frequency deviation value influence, j=1,2, b-l, b are the length of midamble sequence, and l is the quantity of described part chip, i=1,, N, N are the quantity of described interference user.
3. method according to claim 2 is characterized in that, described predetermined interference signal a ‾ i = h i * m ‾ i , Wherein, h iBe the channel impulse response of i described interference user, * calculates convolution,
Figure FSA00000026396000014
It is the midamble sequence of i described interference user correspondence.
4. method according to claim 2 is characterized in that, described reconstruct is eliminated in described base station from the midamble signal that receives midamble interference signal comprises:
The midamble signal of eliminating after disturbing is calculated in described base station r ′ = r - Σ i = 1 N b i , Wherein, r is the midamble signal that described base station receives.
5. method according to claim 1, it is characterized in that, described base station is eliminated after the midamble interference signal of described reconstruct from the midamble signal that receives, also comprise: the midamble signal after disturb described elimination described base station carries out frequency offset estimating, obtains the frequency deviation value of active user at current time.
6. method according to claim 5 is characterized in that, the midamble signal after disturb described elimination described base station carries out frequency offset estimating and comprises:
Midamble signal after disturb described elimination described base station carries out frequency offset estimating, obtains the instantaneous frequency deviation f of described active user at current time m, and to f mSmoothly obtain the frequency deviation rough estimate result of described current time
Figure FSA00000026396000022
Adopt described base station
Figure FSA00000026396000023
Described base station is compensated the data-signal after being compensated at the data-signal that described current time receives;
The data-signal of described base station after to described compensation carries out frequency offset estimating, obtains described active user at the thin estimated result f of the frequency deviation of described current time d, and to f dCarry out smoothly obtaining the frequency deviation value of described active user at described current time
Figure FSA00000026396000024
7. method according to claim 6 is characterized in that, to f mSmoothly comprise: calculate f m ‾ = f ‾ m * × ( 1 - p ) + f m × p , Wherein,
Figure FSA00000026396000026
Be last one constantly
Figure FSA00000026396000027
Value, and f ‾ m * ( 0 ) = 0 , P is a smoothing factor, 0=＜p＜=1.
8. method according to claim 6 is characterized in that, to f dSmoothly comprise: calculate f d ‾ = f ‾ d * × ( 1 - p ) + f d × p , Wherein,
Figure FSA000000263960000210
Be last one constantly
Figure FSA000000263960000211
Value, and f ‾ d * ( 0 ) = 0 , P is a smoothing factor, 0=＜p＜=1.
9. method according to claim 1 is characterized in that, the described frequency deviation value of described interference user is described interference user at last one constantly described frequency deviation value, perhaps, is the described frequency deviation value of described interference user at current time.
10. a base station is characterized in that, comprising:
Disturb reconstructed module, be used for frequency deviation value reconstruct midamble interference signal according to interference user;
Interference cancellation module is used for from the midamble interference signal of the described reconstruct of midamble signal elimination that receives, the midamble signal after the interference that is eliminated.
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CN102724159A (en) * 2012-06-20 2012-10-10 华为技术有限公司 Interference elimination method and device for interfered residential area
WO2014015815A1 (en) * 2012-07-25 2014-01-30 中兴通讯股份有限公司 Device and method for eliminating interference on uplink control channel
CN106877902A (en) * 2015-12-11 2017-06-20 澜起科技（上海）有限公司 The method of noise power estimator, receiver and noise power estimation
CN107294899A (en) * 2016-03-31 2017-10-24 上海贝尔股份有限公司 Communication means and equipment for downlink multiuser superposed transmission

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