CN102739578A - Echo interference suppression method, device and terminal - Google Patents
Echo interference suppression method, device and terminal Download PDFInfo
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- CN102739578A CN102739578A CN2011100855608A CN201110085560A CN102739578A CN 102739578 A CN102739578 A CN 102739578A CN 2011100855608 A CN2011100855608 A CN 2011100855608A CN 201110085560 A CN201110085560 A CN 201110085560A CN 102739578 A CN102739578 A CN 102739578A
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Abstract
The invention is suitable for the wireless communication field and provides an echo interference suppression method, a device and a terminal. The method comprises the steps of according to an input tap coefficient and a digital baseband reference signal, acquiring echo interference signal estimation; acquiring an error signal of the digital baseband signal and the echo interference signal estimation; extracting a symbol of the error signal, and according to the input digital baseband reference signal updating the tap coefficient; and allowing the error signal to undergo delay processing and to be sent into an adaptive FIR filter again as an updated digital baseband reference signal. According to the invention, a simplified data symbol LMS algorithm is employed to update the tap coefficient of the adaptive FIR filter, and the symbol of an echo interference suppression signal are extracted to determine the adaptive updating direction of echo channel estimation, thus the updated value of the tap coefficient and the echo interference signal estimation are acquired, and echo cancellation is realized.
Description
Technical field
The invention belongs to wireless communication field, relate in particular to a kind of echo disturbance restraining method, device and terminal.
Background technology
Adopt interference cancelling system (Interference Cancellation System; ICS) repeater not only can be estimated the transmission characteristic with the following feedback channel adaptively; Thereby weaken self-excitation Effect effectively; Simultaneously, can also reduce the requirement of repeater greatly, significantly improve the stability of system isolation between dual-mode antenna.In the method for echo cancellation of ICS,, after time domain estimates that echo channel and echo disturb, from receive signal, deduct the echo estimated value and realize through echo canceller is installed in the repeater.
In the existing repeater echo removing method; The tap coefficient of sef-adapting filter is mostly through traditional lowest mean square (Least Mean Square; LMS) generation of algorithm or training sequence is upgraded, and algorithm the convergence speed is fast inadequately on the one hand, can't effectively follow the tracks of the variation of outside echo channel and interference; On the other hand, said method all has higher requirement to computation complexity and system hardware resources demand.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of echo disturbance restraining method, is intended to solve the slow problem of update algorithm convergence rate of tap coefficient in the existing echo interference mitigation technology.
The embodiment of the invention is achieved in that a kind of echo disturbance restraining method, and said method comprises the steps:
According to the tap coefficient and the digital baseband reference signal of input, obtain echo talker and estimate;
Obtain the error signal that digital baseband signal and said echo talker are estimated;
Extract the symbol of said error signal, and, said tap coefficient is upgraded according to the said digital baseband reference signal of importing;
Said error signal is postponed to handle, and send into said auto-adaptive fir filter once more as the digital baseband reference signal of upgrading.
Another purpose of the embodiment of the invention is to provide a kind of echo trap, and said device comprises:
Auto-adaptive fir filter is used for the digital baseband reference signal according to tap coefficient and input, obtains echo talker and estimates;
Echo disturbs and suppresses module, is used to obtain the error signal of digital baseband signal and the estimation of said echo talker;
Channel estimator is used to extract the symbol of said error signal, and according to the said digital baseband reference signal of importing, said tap coefficient is upgraded;
Postponement module is used for said error signal is postponed to handle, and sends into said auto-adaptive fir filter once more as the digital baseband reference signal of upgrading.
Another purpose of the embodiment of the invention is to provide a kind of terminal that comprises above-mentioned echo trap.
In embodiments of the present invention; Adopt the reduced data sign LMS algorithm that the tap coefficient of auto-adaptive fir filter is upgraded; Through extracting the symbol of echo interference suppression signal, confirm the adaptive updates direction that echo channel is estimated, and then obtain the echo talker estimation; The realization echo is eliminated, and adopts the variable step factor to improve the convergence rate of reduced data sign LMS algorithm.
Description of drawings
Fig. 1 is the realization schematic diagram of the method for echo cancellation that provides of prior art;
Fig. 2 is the realization flow figure of the echo disturbance restraining method that provides of the embodiment of the invention;
Fig. 3 is the structure chart of the echo interference suppression equipment that provides of the embodiment of the invention;
Fig. 4 is the implementation method block diagram of the echo interference suppression equipment that provides of the embodiment of the invention;
Fig. 5 is the implementation method block diagram that i FIR filter tap coefficients of the echo interference suppression equipment that provides of the embodiment of the invention upgrades branch road.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In embodiments of the present invention; Adopt the reduced data sign LMS algorithm to self adaptation have limit for length's impulse response (Finite Impulse Response, FIR) tap coefficient of filter upgrades, through extracting the symbol of echo interference suppression signal; Confirm the adaptive updates direction that echo channel is estimated; And then obtain tap coefficient updating value and echo talker estimation, realize the echo elimination, and adopt the variable step factor to improve the convergence rate of reduced data sign LMS algorithm.
Fig. 1 shows the realization principle of the method for echo cancellation that prior art provides, and for the ease of explanation, only shows the part relevant with present embodiment.
With reference to Fig. 1; After the signal that reception antenna receives is transformed to analog if signal through low noise amplifier 1, radio-frequency filter 2 and analog down converter 3; Convert this analog if signal into digital medium-frequency signal through analog to digital converter 4; And then convert this digital medium-frequency signal into digital baseband signal r (n) through digital down converter 5, get into repeater 6 and carry out echo and disturb and suppress.
In repeater 6, according to digital baseband reference signal x (n), through echo channel and echo interference being estimated in time domain; Thereby trace into echo talker effectively, from the digital baseband signal r (n) that receives, deduct the echo talker of estimation thus, obtain error signal; This error signal is through echo and disturbs the signal that suppresses; And through with this signal delay, the digital baseband reference signal x (n) that obtains upgrading realizes the estimation that echo channel and echo are disturbed once more.The concrete realization of this part is as shown in Figure 2, repeats no more at this.
The above-mentioned signal that interference suppresses through echo converts digital medium-frequency signal into via digital up converter 7, and suppresses the noise jamming that up-conversion produces through band pass filter, utilizes digital to analog converter 8 to convert analog if signal into afterwards.This analog if signal converts radiofrequency signal into and after power amplification, is launched again by transmitting antenna through radio-frequency-up-converter 9, radio-frequency filter 10 and power amplifier 11, to reach the effect that echo is eliminated.
Fig. 2 shows the realization flow of the echo disturbance restraining method that the embodiment of the invention provides; In embodiments of the present invention; Utilize auto-adaptive fir filter that transmitting antenna is simulated to the coupling channel between the reception antenna; Follow the tracks of the variation of transmitting antenna effectively, and the output through auto-adaptive fir filter disturbs to echo and estimate, from receive signal, deduct the echo talker of estimation thus to coupling channel between reception antenna; Interference suppresses to echo, and details are as follows for the realization flow of this method:
In step S201,, obtain echo talker and estimate according to the tap coefficient and the digital baseband reference signal of input.
In embodiments of the present invention, digital baseband reference signal x (n) is sent into auto-adaptive fir filter, the echo talker that obtains is estimated as w
H(n) x (n), wherein, w (n) is the weight vector of auto-adaptive fir filter, i.e. the tap coefficient of auto-adaptive fir filter.
In step S202, obtain the error signal that digital baseband signal and said echo talker are estimated.
In embodiments of the present invention, error signal e (n) is estimated w for the digital baseband signal r (n) that receives with echo talker
H(n) difference of x (n), i.e. e (n)=r (n)-w (n)
HX (n).
In step S203, extract the symbol of error signal.
In embodiments of the present invention, the symbol of error signal e (n) extracts through sign function sign (x), and the expression formula of this sign function sign (x) is as follows:
In step S204,, adopt the reduced data sign LMS algorithm that the tap coefficient of auto-adaptive fir filter is upgraded according to the symbol and the digital baseband reference signal of said error signal; The more new formula of auto-adaptive fir filter tap coefficient is w (n+1)=w (n)+μ (n) x (n) sign [e* (n)]; Wherein, μ (n) is a step factor, x (n)=[x (n); X (n-1) ... x (n-L+1)]
T, L is the length of auto-adaptive fir filter.
In embodiments of the present invention; After error signal produces; Promptly upgrade with the tap coefficient of the data symbol LMS algorithm of simplifying to auto-adaptive fir filter; Its update mode can be selected continuous renewal, regularly upgrades or through update condition is set, when satisfying update condition, upgrade, and does not limit at this.And the length of auto-adaptive fir filter is relevant with the sample rate of base band; As a realization example of the present invention; Because the maximum delay of intra-frequency repeater echo active path is no more than 1.5ms; Therefore for the baseband sampling rate of 10M, the length of auto-adaptive fir filter is set to 16 and can meets the demands.
In embodiments of the present invention, step factor μ (n) also upgrades after each auto-adaptive fir filter tap coefficient upgrades, and is the variable step factor therefore, and it utilizes formula
Upgrade, wherein, μ (n+1)=α μ (n)+γ | e (n) |
2, μ
MaxBe maximum step-length, μ
MinBe minimum step.
In embodiments of the present invention, 0＜α＜1 is a forgetting factor, and the step factor that shows a moment is to the influence of step-length this moment; γ＞0 is controlling elements; Show the control of error signal to step-length, the value of α and γ is all confirmed according to factors such as channel circumstance and The simulation experiment result, is not limited at this.
In embodiments of the present invention, the step-length of the data symbol LMS algorithm of simplification is chosen for 2 power, and its initial step length is set to μ
Max, its value is near 1, and μ
MinBe taken as less numerical value, to satisfy the least mean-square error of algorithm, μ
MaxAnd μ
MinValue also confirm according to factors such as different channel circumstances and The simulation experiment result, do not limit at this.Approach 1 μ through the definition value
MaxThe μ less with value
Min, in the starting stage of auto-adaptive fir filter adaptive process, because error signal e (n) is bigger, therefore corresponding step factor μ (n) is also corresponding bigger, and then algorithm the convergence speed is very fast, and algorithm progresses into stable state; And along with algorithm progresses into stable state, error signal e (n) reduces, and the therefore corresponding also corresponding minimizing of step factor μ (n) therefore only produces less imbalance near the best weights coefficient.
The more new formula of the variable step factor through definition; The data symbol LMS algorithm of the simplification that the embodiment of the invention provides not only upgrades the tap coefficient of FIR filter; And can further upgrade its step factor; Improve convergence of algorithm speed on the one hand, in time the variation of echo channel and echo interference has been followed the tracks of on the other hand, improved tracking performance well.
In step S205, error signal is postponed to handle, and send into auto-adaptive fir filter once more as the digital baseband reference signal of upgrading.
In embodiments of the present invention; The time that error signal e (n) postpones is the t microsecond; Be defined as the time of delay of echo channel article one active path above-mentioned time of delay; As a realization example of the present invention, can error signal e (n) be made the slip related operation to obtain this delay with the digital baseband signal r (n) that receives.
As one embodiment of the present of invention; The digital baseband reference signal can be coupled from digital baseband and obtain; The echo channel of this moment has comprised all modules between digital up converter as shown in Figure 17 to transmitting antenna, and the coupling of the space between transmitting antenna to reception antenna echo channel.The acquisition process of the digital baseband reference signal that coupling obtains from digital baseband need not to adopt unnecessary device that the signal that obtains is handled, but the influence that echo channel of estimating thus and echo talker receive each module of transmitting terminal easily.
As another embodiment of the present invention; The digital baseband reference signal can be from transmitting antenna end coupled simulation reference signal; And through obtaining after down-conversion and the analog-to-digital conversion, the echo channel of this moment has only comprised the space coupling echo channel between transmitting antenna to reception antenna.The digital baseband reference signal that is converted to of coupling need be carried out down-conversion and analog-to-digital conversion to the reference signal of obtaining from transmitting antenna, but the influence that echo channel that this digital baseband reference signal acquisition process can be avoided estimating and echo talker receive each module of transmitting terminal.
In embodiments of the present invention, the digital baseband reference signal that channel upgrades is again sent into auto-adaptive fir filter, and the step after being begun to carry out again by step S201 is with the tracking that realizes disturbing the echo channel and the echo of continuous variation.Through above-mentioned steps, improved the convergence rate of auto-adaptive fir filter tap coefficient update algorithm, and effectively echo channel and echo talker have been followed the tracks of.
Fig. 3 shows the structure of the echo trap that the embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with present embodiment.
This echo trap can be used for the echo trap of wireless digital intra-frequency repeater, and all can be used among the terminal equipment of echo inhibition occasion, for running on the module of hardware module, software module or software and hardware combining in this equipment.
With reference to Fig. 3, this echo trap disturbs inhibition module 33 and channel estimator 34 to form by Postponement module 31, auto-adaptive fir filter 32, echo, wherein:
Auto-adaptive fir filter 32 according to the tap coefficient and the digital baseband reference signal of input, obtains echo talker and estimates.
Echo disturbs and suppresses module 33, estimates according to digital baseband signal and echo talker, obtains through echo and disturbs the error signal that suppresses.
In embodiments of the present invention; Disturb the signal that suppresses to form the digital baseband reference signal through echo through Postponement module 31; Send into auto-adaptive fir filter 32 and form the echo talker estimation; Send into echo and disturb inhibition module 33 to carry out echo interference inhibition, simultaneously, utilize the tap coefficient of 34 pairs of auto-adaptive fir filters 32 of channel estimator to upgrade.Simultaneously, channel estimator 34 is in the process that the tap coefficient to auto-adaptive fir filter 32 upgrades, and also the step factor to the reduced data sign LMS algorithm that adopted upgrades, the variation of disturbing with timely tracking echo channel and echo.
Fig. 4 shows the implementation method block diagram of the echo suppression system that the embodiment of the invention provides; Wherein, The part of frame of broken lines is the update module of auto-adaptive fir filter tap coefficient in the channel estimator 34, and the implementation method block diagram of the implementation method block diagram of its i auto-adaptive fir filter tap coefficient renewal branch road is as shown in Figure 5.
With reference to Fig. 5; When the tap coefficient to auto-adaptive fir filter upgrades; Need not use multiplier, but adopt one group of shift register and adder can realize renewal, save the use of system hardware resources to a great extent the auto-adaptive fir filter tap coefficient.
As a realization example of the present invention, the radio television signal of the about 730MHz that receives with reception antenna is an example, explains that echo that the embodiment of the invention provides suppresses the workflow of method and system.The radio television signal bandwidth of 730MHz is 8MHz, at first the signal that receives is carried out low noise and amplifies and rf filtering, reduces to face mutually the interference of channel, transforms to the 60MHz analog intermediate frequency through analog down converter then.Afterwards; Adopt 14 analog to digital converter that the analog if signal of 60MHz is carried out sample quantization; Convert the digital medium-frequency signal of 60MHz into; Convert the digital baseband signal of 10MHz or 30MHz again into through digital down converter, to realize that digital baseband signal to 10MHz carries out echo and disturbs and suppress or the digital baseband signal of 30MHz is carried out echo disturb and suppress.
In repeater with echo inhibit feature; To pass through echo disturbs the signal that suppresses to form the digital baseband reference signal through the Postponement module that postpones the t microsecond; It is that L=16 (digital baseband signal is 10MHz) or length are the auto-adaptive fir filter formation echo talker estimation of L=48 (digital baseband signal is 30MHz) that this digital baseband reference signal is sent into length; This echo talker is estimated that the echo of sending into the repeater disturbs the inhibition module to carry out echo interference inhibition; Meanwhile, channel estimator employing reduced data symbol LMS method is upgraded the tap coefficient of auto-adaptive fir filter.In this realization example, step-length forgetting factor and controlling elements are selected 2-7 respectively, the initial step length μ (0)=0 of algorithm.
To disturb the signal that suppresses to handle through echo through digital up converter; Revert to the digital medium-frequency signal of 60MHz; Suppress the noise jamming that up-conversion produces through band pass filter then; Utilize digital to analog converter to convert the digital medium-frequency signal of 60MHz into analog if signal, at last this analog if signal is handled in simulation upconverter and power amplifier, obtain the repeating transmission radio frequency analog signal about 730MHz; This radio frequency analog signal is sent through transmitting antenna, realize the echo elimination.
In embodiments of the present invention; Through the data symbol LMS algorithm of simplifying, improved the convergence rate of auto-adaptive fir filter tap coefficient update algorithm, can follow the tracks of the variation of echo channel and echo interference in time; Improved tracking performance; Simultaneously, the data symbol LMS algorithm of simplification is simplified for the requirement of system greatly, has saved system hardware resources well.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an echo disturbance restraining method is characterized in that, said method comprises the steps:
According to the tap coefficient and the digital baseband reference signal of input, obtain echo talker and estimate;
Obtain the error signal that digital baseband signal and said echo talker are estimated;
Extract the symbol of said error signal, and, said tap coefficient is upgraded according to the said digital baseband reference signal of importing;
Said error signal is postponed to handle, and send into said auto-adaptive fir filter once more as the digital baseband reference signal of upgrading.
2. the method for claim 1 is characterized in that, said tap coefficient utilizes reduced data symbol lowest mean square LMS algorithm to upgrade, and more new formula is w (n+1)=w (n)+μ (n) x (n) sign [e* (n)], wherein,
W (n) is said tap coefficient, and μ (n) is a step factor, x (n)=[x (n), x (n-1) ... x (n-L+1)]
TBe said digital baseband reference signal, L is the length of auto-adaptive fir filter, and e (n) is said error signal, and sign [e* (n)] is for extracting the function of said error signal symbol, and n is a time series.
3. according to claim 1 or claim 2 method is characterized in that said method also comprises the steps:
Step factor is upgraded, and the more new formula of said step factor does
Wherein, μ (n+1)=α μ (n)+γ | e (n) |
2, μ
MaxBe maximum step-length, μ
MinBe minimum step, 0＜α＜1 is a forgetting factor, and the said step factor that shows a moment is to the influence of step-length this moment, and γ＞0 is controlling elements, shows the control of said error signal to step-length.
4. method as claimed in claim 3 is characterized in that, the value of said step factor is 2 power, and initial value is μ
Max
5. the method for claim 1 is characterized in that, said digital baseband reference signal obtains from digital baseband or the coupling of transmitting antenna end.
6. an echo trap is characterized in that, said device comprises:
Auto-adaptive fir filter is used for the digital baseband reference signal according to tap coefficient and input, obtains echo talker and estimates;
Echo disturbs and suppresses module, is used to obtain the error signal of digital baseband signal and the estimation of said echo talker;
Channel estimator is used to extract the symbol of said error signal, and according to the said digital baseband reference signal of importing, said tap coefficient is upgraded;
Postponement module is used for said error signal is postponed to handle, and sends into said auto-adaptive fir filter once more as the digital baseband reference signal of upgrading.
7. device as claimed in claim 6 is characterized in that, said channel estimator also be used for to said tap coefficient more the step factor of new formula upgrade.
8. device as claimed in claim 6 is characterized in that, said channel estimator adopts one group of shift register and adder that said tap coefficient is upgraded.
9. terminal that comprises each described echo trap of claim 6 to 8.
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| CN104158776B (en) * | 2014-08-14 | 2017-08-25 | 电子科技大学 | A kind of digital echo offsets method |
| CN104158776A (en) * | 2014-08-14 | 2014-11-19 | 电子科技大学 | Digital echo cancellation method |
| CN104678380A (en) * | 2015-01-26 | 2015-06-03 | 东南大学 | Direct wave restraining method based on LMS algorithm in high-speed small target detection |
| CN107786476A (en) * | 2016-08-31 | 2018-03-09 | 华为技术有限公司 | A kind of wave filter, time-domain equalizer and receiver |
| CN107786476B (en) * | 2016-08-31 | 2020-09-08 | 华为技术有限公司 | Filter, time domain equalizer and receiver |
| CN107801235A (en) * | 2016-09-02 | 2018-03-13 | 马维尔国际贸易有限公司 | Echo or interference in communication system eliminate power and save management system and method |
| CN107801235B (en) * | 2016-09-02 | 2022-03-18 | 马维尔亚洲私人有限公司 | Echo or interference cancellation power saving management system and method in a communication system |
| CN106330801A (en) * | 2016-09-19 | 2017-01-11 | 东莞理工学院 | Adaptive convex combination interference cancellation method in ICS on-channel repeater |
| CN109245815A (en) * | 2018-08-02 | 2019-01-18 | 中山大学 | The transmitting signal of repeater determines method and system |
| CN112994653A (en) * | 2019-12-17 | 2021-06-18 | 意法半导体股份有限公司 | Image rejection compensation method, circuit, receiver device and computer program product |
| CN111726306A (en) * | 2020-05-11 | 2020-09-29 | 北京大学 | Full duplex system phase noise suppression method based on two-stage adaptive filtering |
| CN111726306B (en) * | 2020-05-11 | 2021-06-29 | 北京大学 | Full duplex system phase noise suppression method based on two-stage adaptive filtering |
| CN112731305A (en) * | 2020-12-17 | 2021-04-30 | 国网四川省电力公司信息通信公司 | Direct wave suppression method and system based on adaptive Doppler domain beam cancellation |
| CN112731305B (en) * | 2020-12-17 | 2024-05-03 | 国网四川省电力公司信息通信公司 | Direct wave inhibition method and system based on self-adaptive Doppler domain beam cancellation |
| CN114204946A (en) * | 2022-01-27 | 2022-03-18 | 南通大学 | Method for inhibiting backward stray light of space laser communication terminal on same receiving and transmitting path |
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Application publication date: 20121017 |