CN106301419B - Radio frequency interference removing method and device - Google Patents
Radio frequency interference removing method and device Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of radio frequency interference removing method and device.The described method includes: estimating the power of the Searching point of radiofrequency signal to be processed；According to the power of Searching point, the multipath parameter of Searching point is obtained, multipath parameter is the signal parameter on multiple paths；According to the multipath parameter of Searching point, self-interference signal is estimated in foundation；Using self-interference signal is estimated, interference elimination is carried out to radiofrequency signal to be processed.The embodiment of the present invention estimates self-interference signal by the building of the multipath parameter of Searching point, estimates self-interference signal using this and eliminates multipath signal in radiofrequency signal to be processed, i.e. multipath radio frequency interference, realizes effectively eliminating for radio frequency interference.
Description
Technical field
The present embodiments relate to the communication technology more particularly to a kind of radio frequency interference removing methods and device.
Background technique
Full duplex completes transmitting-receiving in the same frequency range of same time utilization.The availability of frequency spectrum of full duplex is relative to traditional
Time division duplex (Time Division Duplexing, referred to as: TDD) and frequency division duplex (Frequency Division
Availability of frequency spectrum Duplexing, referred to as: FDD) doubles, but full duplex can bring self-interference problem.In practical application
In, self-interference signal is often more much larger than useful signal, will lead to communicating pair in this way and is unable to normal communication；And it is if straight
Connecing will receive in signal access analog digital converter (Analog to Digital Converter, referred to as: ADC), will cause
ADC saturation is even burnt, it is therefore desirable to carry out radio frequency interference elimination, before ADC to ensure that ADC will not be saturated and communicate just
Often carry out.
Existing radio frequency interference removing method is mostly based on gradient descent algorithm.Existing based on gradient descent algorithm
In radio frequency interference removing method, firstly, the energy function after establishing self-interference signal and being offseted with the self-interference signal estimated.Specifically
, enable f (t) for transmitting signal, △ A0For amplitude fading amount of the transmitting signal after radio transmission, t0Pass through for transmitting signal
Time delay after radio transmission, A are the adjustment amplitude fading amount for emitting signal, and ψ is the phase adjustment for emitting signal, TsFor
Emit the time domain period of signal, then self-interference signal is △ A0×f(t-t0), the self-interference signal estimated is A × f (t) ejψ, right
Energy function after disappearing are as follows:
Then, according to gradient descent algorithm, the value of the A and ψ that estimate.Specifically, { A, ψ } is denoted as Searching point, if
Energy function after offseting is most fast along the decline of negative gradient direction in a certain Searching point, determines searcher using negative gradient direction
To enabling each iteration to gradually reduce the energy function after offseting, obtain optimum search point to get the value of A and ψ is arrived.
According to the value of A and ψ, the self-interference signal estimated is established, is offseted with signal is received, eliminates self-interference signal.
Though the existing radio frequency interference removing method based on gradient decline can eliminate self-interference signal to a certain extent,
But the self-interference signal of multipath can not be eliminated.
Summary of the invention
The embodiment of the present invention provides a kind of radio frequency interference removing method and device, to solve above-mentioned existing decline based on gradient
Radio frequency interference removing method the problem of can not eliminating multipath signal, realize effectively eliminating for interference.
In a first aspect, the embodiment of the present invention provides a kind of radio frequency interference removing method, it is applied to full duplex system, it is described to penetrate
Frequency interference elimination method includes:
Estimate the power of the Searching point of radiofrequency signal to be processed；
According to the power of described search point, the multipath parameter of described search point is obtained, the multipath parameter is multiple paths
On signal parameter；
According to the multipath parameter of described search point, self-interference signal is estimated in foundation；
Self-interference signal is estimated using described, interference elimination is carried out to the radiofrequency signal to be processed.
With reference to first aspect, in the first possible implementation of the first aspect, the signal parameter includes at least
Amplitude, phase and when Yanzhong at least two types.
With reference to first aspect or the first possible implementation of first aspect, second in first aspect are possible
In implementation, if the number of path in the multiple path is M, the number of signal parameter is N in each path, then described search point
The total M of multipath parameter × it is N number of, N number of signal parameter in first path in the multiple path is followed successively by, until m-th path
N number of signal parameter, wherein the M be greater than or equal to 2, the N be greater than or equal to 2.
With reference to first aspect, the first of first aspect into second of possible implementation any one, first
In the third possible implementation of aspect, self-interference signal is estimated described in the use, radiofrequency signal to be processed is carried out
After interference is eliminated, the radio frequency interference removing method further include:
Obtain the power or signal-to-noise ratio of the signal after interference is eliminated；
If the power or signal-to-noise ratio of the signal after the interference elimination are greater than or equal to preset threshold, according to the following formula
Determine the gradient descent direction of described search point:
Wherein, eiIt is in addition to i-th of component is
The vector that other components are 0 other than 1, i=1,2 ..., p, p indicate L (θn) dimension, L (θn) it is described search point θn={ x1,
x2,…xPAt target function value, xiIndicate the signal parameter, Cn=ceil (cn× L), ceil () function representation takes downwards
Whole, purpose existing for L is to make CnWith θnOrder of magnitude matching, n is the number of iterations, and the value of c and γ are to be pre-configured with
's；
The step-size in search of described search point is determined according to the following formula:
Wherein, a indicates described search step-length；T1,T2,T3,T4,T5For gain coefficient, numerical value is preconfigured；D1,
D2,D3,D4,D5For d value range division limits, numerical value be it is preconfigured, d is | L+(cn,θn)-L-(cn,θn) | mean value,
Mean () indicates mean function；
According to the gradient descent direction of described search point, next Searching point is determined with described search step-length, under described
One Searching point executes the multipath parameter of the new Searching point of the basis as new Searching point, and self-interference signal is estimated in foundation,
Until the power or signal-to-noise ratio of the signal after interference elimination are less than the preset threshold.
The third possible implementation with reference to first aspect, in the 4th kind of possible implementation of first aspect
In, the gradient descent direction according to described search point determines next Searching point with described search step-length, comprising:
According to the following formula, next Searching point is determined:
Wherein, θn+1Indicate next Searching point；K, the value of A and α is preconfigured；k
Control parameter is indicated, for controlling anReduction speed, 0 < k < 1.
The third or the 4th kind of possible implementation with reference to first aspect, in the 5th kind of possible reality of first aspect
In existing mode, the multipath parameter according to described search point, before self-interference signal is estimated in foundation, the radio frequency interference is eliminated
Method further include:
Using transmitting Signal Matching filtered received signal, the peak power of filtered signal is calculated；
Compare the peak power of the filtered signal and the size of pre-determined threshold；
If the peak power of the filtered signal is greater than or equal to the pre-determined threshold, letter is carried out to the reception signal
Power of the noise figure that compared estimate of making an uproar obtains as described search point, and institute is judged when executing the radio frequency interference removing method
State the signal-to-noise ratio of the signal after interference is eliminated and the size of the preset threshold；
If the peak power of the filtered signal is less than the pre-determined threshold, the mean power for receiving signal is obtained
As the power of described search point, and the signal after the interference elimination is judged when executing the radio frequency interference removing method
The size of power and the preset threshold.
Second aspect, the embodiment of the present invention provide a kind of radio frequency interference cancellation element, are applied to full duplex system, described to penetrate
Frequency interference blanking unit includes:
Power acquisition module, the power of the Searching point for estimating radiofrequency signal to be processed；
Parameter acquisition module, the power of the described search point for being obtained according to the power acquisition module, described in acquisition
The multipath parameter of Searching point, the multipath parameter are the signal parameter on multiple paths；
Signal establishes module, the multipath parameter of the described search point for being obtained according to the parameter acquisition module, establishes
Estimate self-interference signal；
Interference cancellation module estimates self-interference signal described in module foundation for establishing using the signal, to described
Radiofrequency signal to be processed carries out interference elimination.
In conjunction with second aspect, in the first possible implementation of the second aspect, the signal parameter is included at least
Amplitude, phase and when Yanzhong at least two types.
In conjunction with the possible implementation of the first of second aspect or second aspect, second in second aspect is possible
In implementation, if the number of path in the multiple path is M, the number of signal parameter is N in each path, then described search point
The total M of multipath parameter × it is N number of, N number of signal parameter in first path in the multiple path is followed successively by, until m-th path
N number of signal parameter, wherein the M be greater than or equal to 2, the N be greater than or equal to 2.
In conjunction with second aspect, second aspect the first into second of possible implementation any one, second
In the third possible implementation of aspect, the radio frequency interference cancellation element further include: processing module and comparison module；
The power acquisition module is also used to obtain the power or signal-to-noise ratio of the signal after interference is eliminated；
The comparison module, the power of the signal after being eliminated for the interference or signal-to-noise ratio and preset threshold it is big
It is small；
The processing module, for performing the following operations:
If the output result of the comparison module is that the power of the signal after the interference is eliminated or signal-to-noise ratio are greater than or wait
In the preset threshold, then the gradient descent direction of described search point is determined according to the following formula:
Wherein, eiIt is in addition to i-th of component
It is the vector that other components are 0 other than 1, i=1,2 ..., p, p expression L (θn) dimension, L (θn) it is described search point θn=
{x1,x2,…xPAt target function value, xiIndicate the signal parameter, Cn=ceil (cn× L), ceil () function representation to
Lower rounding, purpose existing for L is to make CnWith θnOrder of magnitude matching, n is the number of iterations, and the value of c and γ are to match in advance
It sets；
The step-size in search of described search point is determined according to the following formula:
Wherein, a indicates described search step-length；T1,T2,T3,T4,T5For gain coefficient, numerical value is preconfigured；D1,
D2,D3,D4,D5For d value range division limits, numerical value be it is preconfigured, d is | L+(cn,θn)-L-(cn,θn) | mean value,
Mean () indicates mean function；
According to the gradient descent direction of described search point, next Searching point is determined with described search step-length, under described
For one Searching point as new Searching point, the signal establishes module execution according to the multipath parameter of the new Searching point, builds
It is vertical to estimate self-interference signal, until the power or signal-to-noise ratio of the signal after interference elimination are less than the preset threshold.
In conjunction with the third possible implementation of second aspect, in the 4th kind of possible implementation of second aspect
In, the processing module determines next Searching point in the gradient descent direction according to described search point, with described search step-length
When, specifically:
According to the following formula, next Searching point is determined:
Wherein, θn+1Indicate next Searching point；K, the value of A and α is preconfigured；k
Control parameter is indicated, for controlling anReduction speed, 0 < k < 1.
In conjunction with the third or the 4th kind of possible implementation of second aspect, in the 5th kind of possible reality of second aspect
In existing mode, the radio frequency interference cancellation element further include: filter module；
The filter module, for establishing module according to the multipath parameter of described search point in the signal, foundation is estimated
Before self-interference signal, using transmitting Signal Matching filtered received signal；
The power acquisition module is also used to calculate the peak power of the filtered signal of the filter module output；
The comparison module is also used to the peak power of filtered signal described in comparison and the size of pre-determined threshold；
The processing module, if be also used to the peak power that comparison module output is the filtered signal be greater than or
Equal to the pre-determined threshold, the function of noise figure that signal-to-noise ratio (SNR) estimation obtains as described search point is carried out to the reception signal
Rate, the comparison module is for the signal-to-noise ratio of the signal after the interference elimination and the size of the preset threshold；And if
The comparison module output is that the peak power of the filtered signal is less than the pre-determined threshold, obtains the reception signal
Power of the mean power as described search point, the comparison module for it is more described interference eliminate after signal power with
The size of the preset threshold.
Radio frequency interference of embodiment of the present invention removing method and device estimate self-interference by the multipath parameter building of Searching point
Signal, and estimate self-interference signal using this and eliminate multipath signal in radiofrequency signal to be processed, i.e. multipath radio frequency interference, it realizes
Radio frequency interference effectively eliminates.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to do one simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is signal processing architecture diagram in full duplex system；
Fig. 2 is the flow chart of radio frequency interference removing method embodiment one of the present invention；
Fig. 3 is the flow chart of radio frequency interference removing method embodiment two of the present invention；
Fig. 4 is the flow chart of radio frequency interference removing method embodiment three of the present invention；
Fig. 5 is the flow chart of radio frequency interference removing method example IV of the present invention；
Fig. 6 is the structural schematic diagram of radio frequency interference cancellation element embodiment one of the present invention；
Fig. 7 is the structural schematic diagram of radio frequency interference cancellation element embodiment two of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 shows signal processing framework in full duplex system.As shown in Figure 1, the transmitting letter that full duplex system will emit
Number after the coupling processing of digital processing, digital-to-analogue conversion, simulation process and coupler, pass through circulator or power splitter transmitting
It goes out；And full duplex system is by circulator or the received reception signal of power splitter, through simulation interference elimination, simulation process,
For used in full duplex system after analog-to-digital conversion, digital interference elimination and digital processing.
Based on above-mentioned steps it is found that in full duplex system, for example, interference disappears in coaxial co-channel full duplex system simultaneously
It except that can be eliminated in analog domain, can also be eliminated in numeric field, or first be eliminated in analog domain, then be existed again
Numeric field is eliminated.The isolation that summation may include circulator or power splitter, simulation interference elimination and number are eliminated in interference
Interfere the adduction eliminated.
For example, receiving the self-interference signal 20 decibels (dB) bigger than useful signal in signal or more before interference is eliminated；?
After interference is eliminated, self-interference signal is 30dB or more smaller than useful signal.Therefore, it in full duplex system, carries out interference and disappears
Divided by reduction self-interference signal, wherein it includes radio frequency interference elimination and/or digital interference elimination that interference, which is eliminated,.
Fig. 2 is the flow chart of radio frequency interference removing method embodiment one of the present invention.The embodiment of the present invention provides a kind of radio frequency
Interference elimination method, the radio frequency interference removing method are a kind of based on the multi-path jamming search controlling party for improving stochastic approximation method
Method is applied to full duplex system.This method can be executed by arbitrarily executing the device of radio frequency interference removing method, which can
To pass through software and or hardware realization.In the present embodiment, this method can be in digital front-end (digital frontend, letter
Claim: DFE) on field programmable gate array (Field Programmable Gate Array, referred to as: FPGA) on realize,
Then by serial ports go control offset the amplitude fading device on front end (cancellation frontend, referred to as: CFE) plate and
Phase shifter is reached in radio frequency interference elimination with this.Why select FPGA to calculate, is to combine arithmetic speed and method receipts
It holds back speed to consider, but invention is not limited thereto.
As shown in Fig. 2, the radio frequency interference removing method includes:
S201, estimation radiofrequency signal to be processed Searching point power.
S202, the power according to Searching point, obtain the multipath parameter of Searching point.
Self-interference signal is estimated in S203, the multipath parameter according to Searching point, foundation.
S204, using self-interference signal is estimated, interference elimination is carried out to radiofrequency signal to be processed.
Wherein, multipath parameter is the signal parameter on multiple paths.In full duplex system, since uplink and downlink are all used
Similar frequency bands, therefore in communication, the transmitting signal that full duplex system issues may be connect through multiple paths by the full duplex system
It receives, causes the interference to received useful signal.And in this multiple path, amplitude fading, phase shift and time delay of signal etc.
It is independent from each other.Here the signal parameters such as the amplitude, phase and time delay in multiple paths are referred to as multipath parameter.It can manage
Solution, signal parameter can include at least at least two types in the parameters such as amplitude, phase and time delay.
If the number of path in multiple paths is M, the number of signal parameter is N in each path, then the multipath parameter of Searching point
Total M × N number of is followed successively by N number of signal parameter in first path in multiple paths, until N number of signal parameter in m-th path,
Wherein, M is greater than or equal to 2, N and is greater than or equal to 2.
For example, being set with 4 paths, illustrate so that signal parameter includes three amplitude, phase and time delay types as an example, also
It is to say, 3 each path respective amplitude, phase and time delay parameters then share 12 multipath parameters, use θn={ x1,x2,…x12}
Indicate Searching point, wherein x1Indicate the amplitude in first path, x2Indicate the phase in first path, x3Indicate first path
Time delay, x4Indicate the amplitude in second path, and so on, x12Indicate the time delay in the 4th path.Wherein, xi(1≤i≤
12) value range can be 0~216Integer in -1, the present invention not limit.
Because estimating what self-interference signal was constructed according to the multipath parameter of Searching point, it is therefore contemplated that this estimates self-interference
Signal is that multipath estimates self-interference signal.
Self-interference signal is estimated using this, interference elimination is carried out to radiofrequency signal to be processed, so as to eliminate to be processed penetrate
Multipath signal in frequency signal.
The embodiment of the present invention estimates self-interference signal by the multipath parameter building of Searching point, and estimates self-interference using this
Signal eliminates the multipath signal in radiofrequency signal to be processed, i.e. multipath radio frequency interference, realizes effectively eliminating for radio frequency interference.
Fig. 3 is the flow chart of radio frequency interference removing method embodiment two of the present invention.As shown in figure 3, the embodiment of the present invention exists
On the basis of above-described embodiment, after S204, radio frequency interference removing method can also include:
S301, the power or signal-to-noise ratio for obtaining the signal after interference is eliminated.
If the power or signal-to-noise ratio of the signal after S302, interference elimination are greater than or equal to preset threshold, according to Searching point
Gradient descent direction, determine that next Searching point as new Searching point, is executed according to new Searching point using step-size in search
Self-interference signal is estimated in multipath parameter, foundation, until the power or signal-to-noise ratio of the signal after interference elimination are less than preset threshold.
For the step, it will be understood by those skilled in the art that in a kind of scene, if what is obtained in S301 is that interference disappears
The power of signal after removing judges the power of the signal after interference is eliminated and the size of preset threshold then in S302；It is another
In scene, if it is confirmed that the signal-to-noise ratio of the signal after interference elimination judges after interfering elimination in S302 in S301
The signal-to-noise ratio of signal and the size of preset threshold.And preset threshold used in above two scene can be identical, it can also be with
Difference, the present invention are not limited.
Step-size in search in the embodiment of the present invention is variable.In other words, different gradient descent directions is corresponding searches
Suo Buchang can be different, and specific descriptions can refer to subsequent embodiment.
Wherein, the size of preset threshold can be arbitrary value, and the present invention is not limited, for example, the preset threshold can
Think 0, etc..
Searching point next for determination executes the multipath parameter according to Searching point as new Searching point, and foundation is estimated
Self-interference signal, it will be understood by those skilled in the art that new Searching point still executes S201 to this after the new Searching point of determination
To S204, alternatively, S201 to S204 and S301 to S302, the power or signal-to-noise ratio of the signal after interference is eliminated are less than default
Threshold value, that is to say, that constantly update Searching point, until using according to Searching point establishes estimate self-interference signal carry out interfere disappear
The power or signal-to-noise ratio of signal after removing are less than preset value.
Optionally, if the power or signal-to-noise ratio of the signal after interference elimination are less than preset threshold, terminate search process.
On the basis of the above embodiments, the gradient descent direction of Searching point is determined according to the following formula:
Wherein, eiIt is in addition to i-th of component
It is the vector that other components are 0 other than 1, i=1,2 ..., p, p expression L (θn) dimension, L (θn) it is Searching point θn={ x1,
x2,…xPAt target function value, xiIndicate signal parameter.Cn=ceil (cn× L), ceil () function representation is rounded downwards, L
Existing purpose is to make CnWith θnThe order of magnitude matching, for example, L=(2 can be taken16-1)/25.N is the number of iterations, c
And the value of γ is preconfigured.In practical application scene, L (θn) it can be performance number or calculate that wave detector is read
Unique measurable value in the signal power value and the embodiment arrived.xiThe value range of (1≤i≤p) can be 0~216-
Integer in 1, it should be noted that, system that invention is not limited thereto.
In the prior art, parameter a, c, A, alpha, gamma value are fixed, and are taken as a=1, c=0.5, A=2 based on experience value, and α=
0.602, γ=0.101, with being incremented by for the number of iterations n, an、cnIt is gradually reduced, so that search scope and search step are reduced,
Improve search precision.
But it finds in practical applications, due to by measured value difference L+(cn,θn)-L-(cn,θn) influence, step-size in search
It can not change as expected, this will lead to method and does not restrain.Therefore, the embodiment of the present invention improves the prior art, reduces and surveys
Influence of the magnitude difference to search scope and search step.
It is found by actual test, measured value difference L+(cn,θn)-L-(cn,θn) bigger, step-size in search is bigger, for row
Except the influence of measured value difference, selection keeps other parameters constant, and changes the size of step-size in search according to measured value difference, obtains
It should be inversely to measured value difference and step-size in search.In addition, there is a situation where that step-size in search is less than normal in low measured value, this
Will lead to interference elimination method can only converge to local best points and not reach globe optimum, then root of the embodiment of the present invention
It has carried out further constraint to step-size in search according to current measurement value to control, the adaptive formula for adjusting step-size in search is as follows:
Wherein, a indicates step-size in search；T1,T2,T3,T4,T5For gain coefficient, numerical value can be preconfigured；D1,
D2,D3,D4,D5For d value range division limits, numerical value can be preconfigured, and d is | L+(cn,θn)-L-(cn,θn) | it is equal
Value, mean () indicate mean function.
Further, according to the gradient descent direction of Searching point, next Searching point is determined with above-mentioned step-size in search, it can be with
Include: according to the following formula, to determine next Searching point:
Wherein, θn+1Indicate next Searching point；The value of A and α can be preconfigured.
Based on above-mentioned, when specific implementation, a proposed individually to calculate, enables an/cn=a × Bn, wherein Bn=nγ/[c×(n+
A)α].Assuming that the value of n is from 1~104, by BnAnd CnAll probable values calculate, import FPGA in be used as look-up table, executing
When interference elimination method, corresponding B is searched by n value in a lookup tablenAnd Cn, to save computing resource, accelerate convergence speed
Degree.
It is analyzed by a large amount of actual measurements and data, obtains the gain coefficient for adapting to current application scene and d value range is drawn
The value of boundary is as follows:
T1=50, T2=10, T3=2, T4=0.2, T5=0.1
D1=0.1, D2=1, D3=10, D4=100
Note that gain coefficient and d value range division limits are surveyed under the conditions of practical application as a result, therefore, to mention
High method generality, can be set to external configurable parameter, modify according to the actual situation.The value of step-size in search is
Real-time update, iterative calculation is primary every time.In the embodiment of the present invention, variable searching step can guarantee that interference is eliminated in this way
The convergence rate of method comparatively fast carries out interference elimination.
By testing the above method, discovery method can tend towards stability, but step-size in search reduction is too fast, makes method
It is unable to reach globe optimum, then the embodiment of the present invention is to anSolution formula improve, slow down the reduction of step-size in search
Speed introduces control parameter, and formula is as follows:
Wherein, k indicates control parameter, for controlling anReduction speed, 0 < k < 1.
In practical applications, k=0.1 can be taken.Equally, k should be set as external configurable parameter.
It has also been found that, initiating searches position also has an impact to the convergence of method, therefore, by initial search point, that is, θ in actual measurementinit
Being set as external can match, and by θinitAs benchmark point, command deployment point maximum magnitude F, it is therefore an objective to guarantee changing for limited times
Generation number.If the θ obtainednOutside range F, then the boundary value of F is taken.This maximum search range according to the actual situation depending on,
F=θ is enabled in the embodiment of the present inventioninit±5000。
In addition, for the case where avoiding optimum search point from being located at other than maximum search range, making method that optimum point be not achieved, often
Every a period of time, such as iteration 100 times, i.e. when n=100, also needs to update an initial search point, just can gradually restrain in this way
To optimum point.
Therefore, on the basis of the above, according to the gradient descent direction of Searching point, next Searching point is determined with step-size in search
Before new Searching point, this method can also include: to judge whether the numerical value of counter is less than preset value, which uses
In counting the number of iterations；If the numerical value of counter is less than preset value, the gradient descent direction according to Searching point is executed, with search
Step-length determines next Searching point as new Searching point.The embodiment avoids interference from disappearing using the number of iterations of preset value size
Except the defect of the local optimum of method, guarantee the global optimum of interference elimination method.
Further, if the numerical value of counter is equal to preset value, Searching point is updated, and the numerical value of counter is zeroed,
Then the multipath parameter according to Searching point is executed, self-interference signal is estimated in foundation.
When specific implementation, it can prevent from falling into local best points by initial search point and control switch.Below by way of figure
Example shown in 4 is illustrated.
Fig. 4 is the flow chart of radio frequency interference removing method embodiment three of the present invention.As shown in figure 4, this method may include:
S401, parameter initialization.
Wherein, parameter includes θinit,θn,θmin, c, A, alpha, gamma, n, cnt, PowerMin, N and BnAnd CnLook-up table.
θnIt is assigned to the set of the value of amplitude, phase and time delay, i.e. point.Wherein, θinitIt indicates initial ranging point, passes through outside
Configuration, functions as θ1Operation is participated in, and as base position command deployment point range.Cnt indicates the numerical value of counter, uses
In update initial search point θinit.PowerMin is used to save optimal measured value (minimal power values, i.e. convergence door searched
Limit), initial value θinitThe measured value at place.θminFor saving the optimal measured value point searched, initial value θinit。
C, A, alpha, gamma, n and BnAnd CnLook-up table meaning as described above, details are not described herein again.Initialize n=1, cnt=1, cnt
For counting, a θ is updated when cnt count down to N=100init。
S402, stochastic approximation method is improved.
Stochastic approximation method is improved, input parameter includes θinit,θn, c, A, alpha, gamma, n, cnt, N, output parameter includes
θn, n, cnt, P, P indicate measurement performance number.
Firstly, calculating L+(cn,θn) and L-(cn,θn)；Then, d, a are calculatedn,a；Finally, calculating new Searching point θn+1With
P。
S403, judge whether P < PowerMin is true.
If P < PowerMin is set up, S404 is executed；If P < PowerMin is invalid, S405 is executed.
S404, the value measurement point position corresponding with the performance number for recording P.
Even PowerMin=P, θmin=θn。
S405, judge whether cnt >=N is true.
If cnt >=N is set up, S406 is executed；If cnt >=N is invalid, S407 is executed.
S406, initial ranging point is updated, and by counter clear.
Even θinit=θmin, cnt=0.
S407, judge whether flag=1 is true.
Switching control instruction flag is defined, is controlled by top layer, top layer here refers to a control switch of program, by artificial
Control, carrys out the progress of determining method, if flag=0, terminating method restarts method when flag=1.If flag=1,
Execute S408.
S408, refresh counter and the number of iterations.
Even cnt=cnt+1, n=n+1.
Later, S402 is returned, next iteration is carried out.
By improving stochastic approximation method above, can be stable approach globally optimal solution, convergence rate can also connect
By within the scope of.
In view of interference elimination method is with the minimum optimization aim of self-interference power, so the power of self-interference detection is got over
Accurately, interference elimination method can offset more self-interferences, keep self-interference power smaller.
Therefore, as shown in figure 5, according to the multipath parameter of Searching point, before self-interference signal is estimated in foundation, radio frequency interference disappears
Except method can also include:
S501, using transmitting Signal Matching filtered received signal, calculate the peak power of filtered signal.
S502, judge whether the peak power of filtered signal is greater than or equal to pre-determined threshold.
If so, executing S503；If it is not, executing S504.
S503, power of the obtained noise figure of signal-to-noise ratio (SNR) estimation as Searching point is carried out to receiving signal, and penetrate in execution
The signal-to-noise ratio of signal after judgement interference is eliminated when frequency interference elimination method and the size of preset threshold.
S504, power of the mean power for receiving signal as Searching point is obtained, and is executing radio frequency interference removing method
When judgement interference eliminate after signal power and preset threshold size.
It wherein, is the mean power of calculating reception signal to carry out Interference Detection in S504, it can be in analog domain or number
Word domain is calculated.Analog domain can be completed by means of wave detector；And the calculating of numeric field can be calculate ADC it is later
Average power signal is also possible to the flat of Digital Down Convert (Digital Down Converter, referred to as: DDC) signal later
Equal power.
In S503, then will by carrying out signal-to-noise ratio (signal-to-noise ratio, referred to as: SNR) estimation
Estimate obtained noise figure as jamming power, because when interfering signal power is greater than noise signal, signal-to-noise ratio (SNR) estimation at this time
Value out is really the value of signal interference ratio, that is, the practical value for being approximately equal to interfering signal power of the noise power-value estimated.Wherein,
Signal-to-noise ratio (SNR) estimation is mainly obtained using one section of pilot sequence: firstly, synchronizing to signal is received, extracting pilot sequence；
Then, the mean power of signal and the mean power of noise are estimated respectively using the pilot sequence, by the mean power of noise
As jamming power detected value, finally maximized using SNR to carry out Interference Cancellation.It should be noted that carry out SNR estimation with
Before, it needs to synchronize reception signal.
In the prior art, it generallys use power detection or SNR detection carries out the detection of self-interference signal, but both
Detection method has the following deficiencies:
If when self-interference signal, which is less than, receives signal, convergence rate is slow using power detecting method, detect not smart
Really；
If when self-interference signal is bigger than reception signal obtains more, can not be synchronized, SNR inspection using SNR detection method
Survey is unable to complete, method failure.
Therefore, drawbacks described above, the self-interference detection that the embodiment of the present invention is combined using power detection and SNR detection are based on
Method, embodiment as shown in Figure 5, to overcome drawbacks described above.Therefore, the versatility for the interference elimination method which is protected
It is relatively strong, this method environment no matter bigger than useful signal in self-interference signal, or it is smaller than useful signal in self-interference signal
Under environment, it can effectively carry out eliminating in interference.
Specifically, detection receives whether signal can synchronize.In a kind of scene, if receiving signal can not synchronize,
Power detection is carried out, the detection of self-interference signal intensity is carried out using power detection, and using the optimization aim of minimum power
Carry out self-interference cancellation.In another scene, if receiving signal can synchronize, judge that sync peaks is with signal power ratio
No is more than pre-determined threshold, if being not above pre-determined threshold, is still carried out certainly using power detection and minimum power target
Interference Cancellation.In another scene, if reception signal can synchronize and the power ratio of sync peaks and the signal received
It more than pre-determined threshold, is detected using SNR, and maximizes criterion using SNR and carry out self-interference cancellation.
Wherein, the method for judging whether to synchronize are as follows: choose the pilot sequence in transmitting signal as synchronizing sequence, together
Step sequence has good autocorrelation, is done by the correlation after matched filter divided by average power signal to signal is received
Then power normalization makes comparisons the value after normalization with pre-determined threshold.Wherein, pre-determined threshold can be determined by emulating,
Such as it can be adjusted according to the size being worth after normalization.If the value after normalization is greater than or equal to pre-determined threshold, it is believed that connect
The collection of letters number can synchronize；If the value after normalization is less than pre-determined threshold, then it is assumed that receiving signal can not synchronize.
For example, since self-interference signal may be 20dB or more bigger than receiving signal, receiving signal before counteracting and passing through matching
Correlation very little after filter, without apparent relevant peaks, the value after normalization is also less than pre-determined threshold, at this point, using
Power detection is detected power detection as the intensity of self-interference signal, and using the optimization aim of minimum power come
Carry out self-interference cancellation；Then, self-interference signal power can be gradually reduced, while being received signal and being passed through the phase after matched filter
Pass value can be gradually increased, and when correlation is greater than pre-determined threshold, then be maximized using SNR to detect, the noise figure estimated comes
It is detected as the intensity of self-interference signal, further offsets self-interference signal.
Further, after the power or signal-to-noise ratio of the signal after interference is eliminated are less than preset threshold, interference is eliminated
Method can also include: the signal after eliminating to interference, carry out digital interference elimination in numeric field.It carries out digital interference and eliminates one
Aspect can continue to eliminate self-interference signal；On the other hand signal can smoothly be received.Because of the signal after radio frequency interference counteracting
Frequency spectrum usually deformity is uneven, therefore it need to be carried out smoothly in numeric field.
Fig. 6 is the structural schematic diagram of radio frequency interference cancellation element embodiment one of the present invention.The radio frequency interference cancellation element is answered
For full duplex system.As shown in fig. 6, radio frequency interference cancellation element 60 includes: power acquisition module 61, parameter acquisition module
62, signal establishes module 63 and interference cancellation module 64.
Wherein, power acquisition module 61 is used to estimate the power of the Searching point of radiofrequency signal to be processed.Parameter acquisition module
The power of 62 Searching point for being obtained according to power acquisition module 61, obtains the multipath parameter of Searching point, which is
Signal parameter on multiple paths.The multipath that signal establishes Searching point of the module 63 for obtaining according to parameter acquisition module 62 is joined
Self-interference signal is estimated in number, foundation.The self-interference of estimating that interference cancellation module 64 is used to establish the foundation of module 63 using signal is believed
Number, interference elimination is carried out to radiofrequency signal to be processed.
The device of the present embodiment can be used for executing the technical solution of embodiment of the method shown in Fig. 2, realization principle and skill
Art effect is similar, and details are not described herein again.
In the above-described embodiments, signal parameter can include at least amplitude, phase and when Yanzhong at least two types.
If the number of path in multiple paths is M, the number of signal parameter is N in each path, then the multipath parameter of Searching point
Total M × N number of is followed successively by N number of signal parameter in first path in multiple paths, until N number of signal parameter in m-th path,
Wherein, M is greater than or equal to 2, N and is greater than or equal to 2.
Further, radio frequency interference cancellation element 60 can also include: that processing module (not shown) and comparison module (do not show
Out).
Wherein, power acquisition module 61 can be also used for obtaining the power or signal-to-noise ratio of the signal after interference is eliminated.Compare
Module can be used for comparing the power of the signal after interference is eliminated or the size of signal-to-noise ratio and preset threshold.Processing module can be used for holding
The following operation of row:
1) if the output result of comparison module is the signal after interference is eliminated power or signal-to-noise ratio are more than or equal to default
Threshold value then determines the gradient descent direction of Searching point according to the following formula:
Wherein, eiIt is in addition to i-th of component
It is the vector that other components are 0 other than 1, i=1,2 ..., p, p expression L (θn) dimension, L (θn) it is Searching point θn={ x1,
x2,…xPAt target function value, xiIndicate signal parameter, Cn=ceil (cn× L), ceil () function representation is rounded downwards, L
Existing purpose is to make CnWith θnOrder of magnitude matching, n is the number of iterations, and the value of c and γ are preconfigured.
2) step-size in search of Searching point is determined according to the following formula:
Wherein, a indicates step-size in search；T1,T2,T3,T4,T5For gain coefficient, numerical value is preconfigured；D1,D2,D3,
D4,D5For d value range division limits, numerical value be it is preconfigured, d is | L+(cn,θn)-L-(cn,θn) | mean value, mean ()
Indicate mean function；
3) according to the gradient descent direction of Searching point, next Searching point is determined with step-size in search, by next Searching point
As new Searching point, signal establishes the execution of module 63 according to the multipath parameter of new Searching point, and self-interference signal is estimated in foundation,
Until the power or signal-to-noise ratio of the signal after interference elimination are less than preset threshold.
Wherein, processing module is in the gradient descent direction according to Searching point, when determining next Searching point with step-size in search,
It can specifically:
According to the following formula, next Searching point is determined:
Wherein, θn+1Indicate next Searching point；K, the value of A and α is preconfigured；K is indicated
Control parameter, for controlling anReduction speed, 0 < k < 1.
Closer, radio frequency interference cancellation element 60 can also include: filter module (not shown).Filter module is available
In establishing module 63 according to the multipath parameter of Searching point in signal, establish before estimating self-interference signal, using transmitting signal
With filtered received signal.On this basis, power acquisition module 61 can be also used for believing after calculating the filtering that filter module exports
Number peak power.Comparison module can also be used in the size of the peak power for comparing filtered signal and pre-determined threshold.Handle mould
If block can be also used for the peak power that comparison module output is filtered signal and be greater than or equal to pre-determined threshold, to reception signal
Power of the noise figure that progress signal-to-noise ratio (SNR) estimation obtains as Searching point, at this point, after comparison module is for comparing interference elimination
The signal-to-noise ratio of signal and the size of preset threshold.If processing module can be also used for the peak that comparison module output is filtered signal
Be worth power and be less than pre-determined threshold, obtain power of the mean power as Searching point for receiving signal, at this point, comparison module for than
The power of signal after being eliminated compared with interference and the size of preset threshold.
Fig. 7 is the structural schematic diagram of radio frequency interference cancellation element embodiment two of the present invention.As shown in fig. 7, the present embodiment mentions
The radio frequency interference cancellation element 70 of confession includes processor 71 and memory 72.Wherein, the storage of memory 72 executes instruction, and works as radio frequency
It when interference blanking unit 70 is run, is communicated between processor 71 and memory 72, processor 71 calls the execution in memory 72
Instruction, for executing above-mentioned radio frequency interference removing method, it is similar that the realization principle and technical effect are similar, and details are not described herein again.
In several embodiments provided herein, it should be understood that revealed device and method can pass through it
Its mode is realized.For example, apparatus embodiments described above are merely indicative, for example, the unit or module
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or module
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of equipment or module
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The module as illustrated by the separation member may or may not be physically separated, aobvious as module
The component shown may or may not be physical module, it can and it is in one place, or may be distributed over multiple
In network unit.Some or all of the modules therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer readable storage medium.The journey
When being executed, execution includes the steps that above-mentioned each method embodiment to sequence；And storage medium above-mentioned include: ROM, RAM, magnetic disk or
The various media that can store program code such as person's CD.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of radio frequency interference removing method is applied to full duplex system, which is characterized in that the radio frequency interference removing method packet
It includes:
Estimate the power of the Searching point of radiofrequency signal to be processed；
According to the power of described search point, the multipath parameter of described search point is obtained, the multipath parameter is on multiple paths
Signal parameter；
A, according to the multipath parameter of described search point, self-interference signal is estimated in foundation；
B, self-interference signal is estimated using described, interference elimination is carried out to the radiofrequency signal to be processed；
C, the power or signal-to-noise ratio of the signal after interference is eliminated are obtained；
If the power or signal-to-noise ratio of the signal after D, the interference is eliminated are greater than or equal to preset threshold, according to the following formula really
Determine the gradient descent direction of described search point:
Wherein,eiTo be in addition to i-th component be 1 with
The vector that other outer components are 0, i=1,2 ..., p, p indicate L (θn) dimension, L (θn) it is described search point θn={ x1,x2,…
xPAt target function value, xiIndicate the signal parameter, Cn=ceil (cn× L), ceil () function representation is rounded downwards, L
Existing purpose is to make CnWith θnThe order of magnitude matching,N is the number of iterations, and the value of c and γ are preconfigured；
E, the step-size in search of described search point is determined according to the following formula:
Wherein, a indicates described search step-length；T1,T2,T3,T4,T5For gain coefficient, numerical value is preconfigured；D1,D2,D3,
D4,D5For d value range division limits, numerical value be it is preconfigured, d is | L+(cn,θn)-L-(cn,θn) | mean value, mean ()
Indicate mean function；
F, according to the gradient descent direction of described search point, next Searching point is determined with described search step-length, it will be described next
A Searching point is as new Searching point；
A-F is repeated, until the power or signal-to-noise ratio of the signal after interference elimination are less than the preset threshold.
2. radio frequency interference removing method according to claim 1, which is characterized in that the signal parameter includes at least width
Degree, phase and when Yanzhong at least two types.
3. radio frequency interference removing method according to claim 1 or 2, which is characterized in that if the path in the multiple path
Number is M, and the number of signal parameter is N in each path, then the total M of multipath parameter of described search point × N number of, is followed successively by described more
N number of signal parameter in first path in a path, until N number of signal parameter in m-th path, wherein the M is greater than or waits
In 2, the N is greater than or equal to 2.
4. radio frequency interference removing method according to claim 1, which is characterized in that the gradient according to described search point
Descent direction determines next Searching point with described search step-length, comprising:
According to the following formula, next Searching point is determined:
Wherein, θn+1Indicate next Searching point；K, the value of A and α is preconfigured；K is indicated
Control parameter, for controlling anReduction speed, 0 < k < 1.
5. radio frequency interference removing method according to claim 4, which is characterized in that the multipath according to described search point
Parameter, before self-interference signal is estimated in foundation, the radio frequency interference removing method further include:
Using transmitting Signal Matching filtered received signal, the peak power of filtered signal is calculated；
Compare the peak power of the filtered signal and the size of pre-determined threshold；
If the peak power of the filtered signal is greater than or equal to the pre-determined threshold, signal-to-noise ratio is carried out to the reception signal
Estimate power of the obtained noise figure as described search point, and judges described do when executing the radio frequency interference removing method
Disturb the signal-to-noise ratio of the signal after eliminating and the size of the preset threshold；
If the peak power of the filtered signal is less than the pre-determined threshold, the mean power conduct for receiving signal is obtained
The power of described search point, and the power for interfering the signal after eliminating is judged when executing the radio frequency interference removing method
With the size of the preset threshold.
6. a kind of radio frequency interference cancellation element is applied to full duplex system, which is characterized in that the radio frequency interference cancellation element packet
It includes:
Power acquisition module, the power of the Searching point for estimating radiofrequency signal to be processed；
Parameter acquisition module, the power of the described search point for being obtained according to the power acquisition module obtain described search
The multipath parameter of point, the multipath parameter are the signal parameter on multiple paths；
Signal establishes module, and the multipath parameter of the described search point for being obtained according to the parameter acquisition module, foundation is estimated
Self-interference signal；
Interference cancellation module estimates self-interference signal described in module foundation for establishing using the signal, to described wait locate
Reason radiofrequency signal carries out interference elimination；
The radio frequency interference cancellation element further include: processing module and comparison module；
The power acquisition module is also used to obtain the power or signal-to-noise ratio of the signal after interference is eliminated；
The comparison module, the power of the signal after being eliminated for the interference or the size of signal-to-noise ratio and preset threshold；
The processing module, for performing the following operations:
If the output result of the comparison module is greater than or equal to institute for the power or signal-to-noise ratio of the signal after the interference elimination
Preset threshold is stated, then determines the gradient descent direction of described search point according to the following formula:
Wherein,eiTo be in addition to i-th component be 1 with
The vector that other outer components are 0, i=1,2 ..., p, p indicate L (θn) dimension, L (θn) it is described search point θn={ x1,x2,…
xPAt target function value, xiIndicate the signal parameter, Cn=ceil (cn× L), ceil () function representation is rounded downwards, L
Existing purpose is to make CnWith θnThe order of magnitude matching,N is the number of iterations, and the value of c and γ are preconfigured；
The step-size in search of described search point is determined according to the following formula:
Wherein, a indicates described search step-length；T1,T2,T3,T4,T5For gain coefficient, numerical value is preconfigured；D1,D2,D3,
D4,D5For d value range division limits, numerical value be it is preconfigured, d is | L+(cn,θn)-L-(cn,θn) | mean value, mean ()
Indicate mean function；
According to the gradient descent direction of described search point, next Searching point is determined with described search step-length, it will be described next
For Searching point as new Searching point, the signal establishes module execution according to the multipath parameter of the new Searching point, establishes pre-
Self-interference signal is estimated, until the power or signal-to-noise ratio of the signal after interference elimination are less than the preset threshold.
7. radio frequency interference cancellation element according to claim 6, which is characterized in that the signal parameter includes at least width
Degree, phase and when Yanzhong at least two types.
8. radio frequency interference cancellation element according to claim 6 or 7, which is characterized in that if the path in the multiple path
Number is M, and the number of signal parameter is N in each path, then the total M of multipath parameter of described search point × N number of, is followed successively by described more
N number of signal parameter in first path in a path, until N number of signal parameter in m-th path, wherein the M is greater than or waits
In 2, the N is greater than or equal to 2.
9. radio frequency interference cancellation element according to claim 6, which is characterized in that the processing module is being searched according to
The gradient descent direction of rope point, when determining next Searching point with described search step-length, specifically:
According to the following formula, next Searching point is determined:
Wherein, θn+1Indicate next Searching point；K, the value of A and α is preconfigured；K is indicated
Control parameter, for controlling anReduction speed, 0 < k < 1.
10. radio frequency interference cancellation element according to claim 9, which is characterized in that the radio frequency interference cancellation element is also
It include: filter module；
The filter module, for establishing module according to the multipath parameter of described search point in the signal, foundation is estimated from dry
Before disturbing signal, using transmitting Signal Matching filtered received signal；
The power acquisition module is also used to calculate the peak power of the filtered signal of the filter module output；
The comparison module is also used to the peak power of filtered signal described in comparison and the size of pre-determined threshold；
The processing module is greater than or equal to if being also used to the peak power that the comparison module output is the filtered signal
The pre-determined threshold carries out power of the obtained noise figure of signal-to-noise ratio (SNR) estimation as described search point, institute to the reception signal
State the signal-to-noise ratio of the signal after comparison module is eliminated for the interference and the size of the preset threshold；And it is if described
Comparison module output is that the peak power of the filtered signal is less than the pre-determined threshold, obtains being averaged for the reception signal
Power of the power as described search point, the comparison module for it is more described interference eliminate after signal power with it is described
The size of preset threshold.
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| US10554375B2 (en) | 2017-09-11 | 2020-02-04 | Micron Technology, Inc. | Full duplex device-to-device cooperative communication |
| US11206050B2 (en) | 2018-02-06 | 2021-12-21 | Micron Technology, Inc. | Self interference noise cancellation to support multiple frequency bands |
| CN111756392B (en) * | 2019-03-26 | 2022-04-01 | 达发科技(苏州)有限公司 | Radio frequency interference detection and elimination system applied to Ethernet |
| US10979097B2 (en) | 2019-09-05 | 2021-04-13 | Micron Technology, Inc. | Wireless devices and systems including examples of full duplex transmission using neural networks or recurrent neural networks |
| US11258473B2 (en) | 2020-04-14 | 2022-02-22 | Micron Technology, Inc. | Self interference noise cancellation to support multiple frequency bands with neural networks or recurrent neural networks |
| CN112202527B (en) * | 2020-10-01 | 2022-09-13 | 西北工业大学 | Intelligent electromagnetic signal identification system interference method based on momentum gradient disturbance |
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