CN1773971A - A network device and method for cancelling spurs without affecting an incoming signal - Google Patents
A network device and method for cancelling spurs without affecting an incoming signal Download PDFInfo
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Abstract
A network device for cancelling spurs without affecting an incoming signal. The network device includes an estimator for estimating amplitude and phase of a spur over a predetermined period of time. The network device also includes processing means for freezing further estimation of the amplitude and phase of the spur, for cancelling for an estimated spur and for allowing incoming packets. The network device further includes subtracting means for subtracting the estimated spur from an incoming packet. The estimated spur is subtracted from the incoming packet without affecting incoming signals that are not part of the estimated spur.
Description
Technical field
The present invention relates to a kind of system and method for when harmonic wave and input signal are coupled, eliminating the harmonic wave of digital system clock frequency.
Background technology
The digital dock of running constantly generally all is housed in any digital integrated circuit or the system.Nonlinear effect in these systems often makes base value word clock frequency produce the harmonic wave of this clock frequency.For example, if the reference clock sequence is 100MHz, some processing on the chip may produce undesired 10 to 20 harmonic componentss so, and it occurs at the 1MHz and the 2MHz of 100MHz clock respectively, and occurs at 1GHz and 2GHz.These undesired harmonic waves are also referred to as spurious signal (spur).In particular system,, can predict the precise frequency of spurious signal accurately according to known reference clock and harmonic frequency.
In the fast band system, promptly in high-frequency range, to work and have the system of fast band signal around the center carrier frequencies, the fast band signal is a baseband signal by the video chip down converted, by baseband processor this baseband signal is handled then.Particularly, this baseband signal is digitized, and transfers to digital signal processor and handle.This digital signal processor is generally used for generating the digital dock of operation constantly.Therefore, when radio frequency part and numerical portion were on the same chip, the digital signal of input and clock signal were easy to be coupled.So, digital dock will produce spurious signal in whole fast band system works zone.Therefore, when the input radio frequency signal, will be mixed with spurious frequency in desired signal or the packet signal.This desired signal generally is a spread signal, and for example, bandwidth is the signal of 20MHz.On the other hand, the bandwidth of spurious frequency is very narrow, and this is by the decision of the harmonic wave of clock frequency.
A kind ofly suppress harmonic wave or spuious common method is to use electric insulation between digital system clock and radio circuit.But the effect of insulation is not thorough, and spuiously can produce various problems in the band, comprises the carrier detection problem, for example flase drop.In addition, the spuious signal to noise ratio that also increased of harmonic wave generation.Along with the increase of signal to noise ratio, the probability of lost data packets also increases thereupon.
Summary of the invention
According to an aspect of the present invention, propose a kind ofly to be used to eliminate spuious and not influence the network equipment of input signal.The described network equipment comprises an estimation device, is used for the amplitude and the phase place of estimation spurious signal in predetermined a period of time.The described network equipment also includes processing unit, is used to freeze to the described spuious amplitude and the further estimation of phase place, eliminates the spuious of estimation and allows the input packet signal to enter.The described network equipment further includes and deducts device, is used for deducting the spuious of estimation from the input packet signal, wherein, spuious being deducted the packet signal of described estimation and do not influence the input signal of a spuious part that is not this estimation from input.
According to another aspect of the present invention, propose a kind ofly to be used to eliminate spuious and not influence the method for input signal.Described method is included in spuious amplitude and the phase place of estimation in predetermined a period of time, and freezes the described spuious amplitude and the further estimation of phase place.Described method also comprises to be eliminated the spuious of estimation and allows the input packet signal to enter.This method further comprises from input and deducts the spuious of estimation the packet signal, spuious being deducted from the input packet signal of wherein said estimation and do not influence the input signal of the part of the spurious signal that does not belong to estimation.
According to another aspect of the present invention, propose a kind ofly to eliminate spuious and do not influence the network equipment of input signal, the described network equipment comprises:
An estimation device, spuious amplitude and the phase place of estimation in predetermined a period of time;
Processing unit freezes the described spuious amplitude and the further estimation of phase place, eliminates the spuious of estimation and allows the input packet signal to enter;
Deduct device, deduct the spuious of estimation the packet signal from input, wherein, spuious from the input packet signal, being deducted of described estimation and do not influence the input signal of the part of the spurious signal that does not belong to described estimation.
Preferably, the described network equipment comprises that further the initial estimate that is used for described spuious amplitude and phase place multiply by spuious index on the preset frequency to determine the spuious device of described estimation.
Preferably, described estimation device is a narrowband self-adaption filter, allows the energy on the described spurious frequency to enter, and the energy of every other signal is kept off in the outside.
Preferably, described estimation device estimation is not having described spuious amplitude and phase place under the situation of input signal.
Preferably, described spuious amplitude and phase place under the described interior identical adaptive frequency of estimation device estimation a period of time.
Preferably, described estimation device is a notch filter, with all the energy filterings on the spurious frequency.
Preferably, described estimation device is estimated described spuious amplitude and phase place in predetermined a period of time repeatedly.
Preferably, the described network equipment further includes to be used to from the input packet signal of packet signal lead code determines a suitable gain, automatically with described gain application to described packet signal, and in described spuious amplitude and phase place estimation are begun during this section to packet signal the time with the packet signal gain application by the spuious device adjusted of gain delta to described estimation.
Preferably, the described network equipment further includes the slow variable that is used to follow the trail of the input packet signal at the packet signal reception period and carries out the estimation of amplitude and the phase place device with the change that solves phase place.
Preferably, described estimation device is estimated described spuious amplitude and phase place continuously under the adaptation rate slowly of the variable that is used to follow the trail of the input packet signal, wherein, the spuious gain and the phase change of described estimation can be followed the trail of and upgrade to described estimation device, and do not influence the energy of input signal.
According to another aspect of the present invention, propose a kind ofly to eliminate spuious and do not influence the method for input signal, described method comprises the steps:
Spuious amplitude and the phase place of estimation in predetermined a period of time;
Freeze the described spuious amplitude and the further estimation of phase place;
Eliminate the spuious of estimation;
Allow the input packet signal to enter;
Deduct the spuious of described estimation from input the packet signal, wherein, spuious from the input packet signal, being deducted of described estimation and do not influence the input signal of a spuious part that does not belong to described estimation.
Preferably, described estimation steps comprises that the initial estimate to described spuious amplitude and phase place multiply by the spuious index on the preset frequency, to determine the spuious of described estimation.
Preferably, described estimation steps is included under the situation that does not have input signal described spuious amplitude and phase place is estimated.
Preferably, described estimation steps is included in a period of time and with identical adaptive frequency described spuious amplitude and phase place is estimated.
Preferably, described estimation steps is included in predetermined a period of time and repeatedly described spuious amplitude and phase place is estimated.
Preferably, described method further may further comprise the steps:
For the described input packet signal from the packet signal lead code is determined a suitable gain;
Automatically with described gain application to described packet signal;
In described spuious amplitude and phase place estimation being begun during this section to packet signal the time, the spuious of described estimation adjusted by gain delta with the packet signal gain application.
Preferably, described method further is included in slow variable that the packet signal reception period is used to follow the trail of the input packet signal and carries out estimation to amplitude and phase place to solve the change of phase place.
Preferably, described estimation steps is included under the adaptation rate slowly of the variable that is used to follow the trail of the input packet signal estimates described spuious amplitude and phase place continuously, and upgrades the spuious gain of described estimation and phase change and do not influence the energy of input signal.
Preferably, before described estimation steps, described method is further comprising the steps of:
Determine a channel of operation;
The frequency filtering of radio frequency band is changed into definite channel;
Determine the spurious frequency in the signal bandwidth in the described definite channel;
Upgrade at least one register with described definite spurious frequency.
According to an aspect of the present invention, propose a kind ofly to eliminate spuious and do not influence the equipment of input signal, described equipment comprises:
Estimating device, spuious amplitude and the phase place of estimation in predetermined a period of time;
Freezing plant freezes the described spuious amplitude and the further estimation of phase place;
Cancellation element is eliminated the spuious of estimation;
Allow device, allow the input packet signal to enter;
Deduct device, deduct the spuious of described estimation the packet signal from input, wherein, spuious from the input packet signal, being deducted of described estimation and do not influence the input signal of the part of the spurious signal that does not belong to described estimation.
According to a further aspect in the invention, propose a kind ofly to eliminate spuious and do not influence the equipment of input signal.Described equipment comprises the estimating device that is used for spuious amplitude of in predetermined a period of time estimation and phase place and is used to freeze freezing plant to the further estimation of described spuious amplitude and phase place.Described equipment also comprises and is used to eliminate the spuious cancellation element of estimation and is used to allow to import the permission device that packet signal enters.Described equipment also comprises the spuious device that deducts that is used for deducting from the input packet signal described estimation, wherein, and spuious from the input packet signal, being deducted of described estimation and do not influence the input signal of the part of the spurious signal that does not belong to described estimation.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic diagram according to the spuious arrester 100 of one embodiment of the invention;
Fig. 2 is the flow chart according to the spuious method of the elimination of one embodiment of the invention.
Embodiment
The present invention seeks a kind of method by using estimation circuit to come harmonic carcellation, uses this estimation circuit to eliminate spuious and does not influence desired signal.According to one embodiment of present invention, because clock frequency is known, so can determine spuious precise frequency relatively easily corresponding to the channel carrier wave frequency.For example, if clock frequency is 80MHz, rf frequency is 2.412GHz, can determine that then in-band harmonic will occur at the 2.416GHz place.In the wireless communication system scheme, for example in 802.11, have channel or " fragment (slice) " of 14 different 2.4GHz frequency bands.Digital dock frequency with 80MHz is an example, can determine the harmonic wave on each channel in 14 signals easily, and these are spuious and suitable estimated value and filtering operation can be eliminated.
Figure 1 shows that the spuious arrester 100 of realizing one embodiment of the invention.Spuious arrester 100 is used to estimate the amplitude and the phase place of spurious frequency, eliminates these spurious frequencies then and does not influence the input packet signal.Spuious arrester comprises ADC 102, estimation device 104 and processor 106.According to one embodiment of present invention, when input sent to the numerical portion of spuious arrester 100, after ADC 102 processing, baseband signal was digitized, and spurious signal will be eliminated.Although the frequency of digital dock and harmonic wave are known, want to eliminate the spuious desired signal that do not influence again, also must determine the amplitude and the phase place of signal.
According to one embodiment of present invention, do not having under the situation of input signal/packet signal, estimation device 104 was estimated spuious amplitude and phase place in the one predetermined very short period.This estimation operation can repeat in a period of time.For estimation each time, estimated value A
kCan obtain according to following equation:
A
k+1＝A
k-μ·[e
k H·e
k]/A
k
A
k+1＝(1-μ·A
k+μ·e
i2π.k.f0/fs·X
k
A wherein
kBe the described spuious amplitude and the estimated value of phase place;
X
kIt is input signal;
e
I.2. π .k.f0/fsBe in frequency f
0The harmonic index at place;
μ is the variable that is used for trace signals.
After obtaining initial estimate, processor 106 is used e
I.2. π .k.f0/fsMultiply by this initial estimate, wherein e
I.2. π .k.f0/fsBe in frequency f
0The harmonic index at place.After this, processor 106 is from input signal X
kIn deduct this product.
Particularly, estimation device 104 is followed the trail of arrowband energy f
0Interior signal.Thereby estimate that device 104 is narrowband self-adaption filters, only allow spuious harmonic wave f
0Energy enter, and with every other energy retaining in the outside.Therefore, when estimating operation, except spuious energy, the energy of every other signal does not allow to enter estimation device 104.So,, can provide good spuious estimated value too even wherein sneaked into noise (because only can enter filter) at the noise of this spurious frequency.
As mentioned above, to spuious estimation can, for example do not carry out the time that signal transmits and receives and carry out, just, when having signal, do not carry out.Those of ordinary skill in the art knows because digital dock is operated in bottom, so do not have to exist under the situation of signal yet spuious.Those of ordinary skill in the art it will also be appreciated that all the static of a period of time can occur after receiving each packet signal, estimation device 104 can utilize this section not have the spuious amplitude and the phase place of time estimation of signal.After estimation spuious amplitude and phase place, spuious arrester 100 can freeze this estimation operation.After this, spuious arrester 100 begins to eliminate spuious.In case receive a packet signal, spuious arrester 100 will deduct spuious from this packet signal.Because it is spuious to have estimated when entering ADC 102 that packet signal can comprise, so correct estimation and deduct operation and can eliminate does not spuiously but influence and spuious input packet signal information with same frequency.
Though can under the situation of input signal spuious amplitude and phase place be estimated not having, be difficult to guarantee in estimation process, do not have packet signal to occur.Those of ordinary skill in the art knows, can rely on higher network indication, and for example the interval between the packet signal defines no signal.But the wrong tendency of this method.Therefore, be not used under the situation of the method for estimating spuious amplitude and phase place under the no signal situation, estimation device 104 can be always with spuious amplitude and the phase place of same adaptive rate estimation.Like this, the spuious amplitude and the initial estimate of phase place will do not had.Therefore, in the elimination process, spuious arrester 100 will always be eliminated the energy with spurious frequency.Even in this embodiment, the signal that part has with spuious same frequency also is eliminated, but should be noted that the loss of signal is very little.
Gain in the above discussion hypothesis radio-frequency front-end does not change, and in this radio-frequency front-end, signal is a base band from the fast band down converted, and has increased suitable gain.Now, if there is a very little input signal, after radio-frequency front-end gained to it, ADC 102 can see the gamut of this signal; If this signal is too big, then need this signal is carried out suitable reduction, make it can be adapted in the scope of ADC.Under the situation that gain changes when radio-frequency front-end receives packet signal, must upgrade the variation that gains with reflection to estimated value.According to the above embodiments, packet signal enter spuious arrester 100 and the gain be determined before, the estimation device 104 spuious amplitude and phase place are estimated that arrester 100 has begun spuious elimination.When packet signal when the lead code of this packet signal enters spuious arrester 100, spuious arrester can be determined suitable gain for this packet signal, and automatically with this gain application to this packet signal.The variation of gain is determined by the intensity that packet signal receives.Should be noted that spuious gain equally also can change if the signal strength signal intensity of expecting changes.So, estimation device 104 needs to solve the gain change in the packet signal receiving course.If the energy level of 70dB for example carries out so estimate to be based on, but the intensity of input packet signal has only 30dB, so spuious value will be lower, and need upgrade this change with reflected signal intensity to estimated value.Therefore in this embodiment of the present invention, when producing initial estimate, until with the packet signal gain application to the packet signal during this period of time in, spuious arrester 100 uses gain delta to adjust the composition of estimation.
In the change in gain process, phase response changes equally.Therefore, in order to determine the variation of phase place, spuious remover 100 is in the packet signal receiving course, and the slow variable μ that is used for trace signals carries out amplitude and phase estimation.In one embodiment of the invention, spuious remover 100 slowly begin to follow the trail of this packet signal.Loading section from the lead code of packet signal to packet signal, what the phase place that spuious remover 100 can track out packet signal is, and the variation of definite phase place.
Can imagine, after the initial estimate that draws spuious amplitude and phase place, in front end, change in gain may take place.For addressing this problem, spuious remover 100 can continue with slower adaptive rate μ operation estimation device 104.So,, estimate that device 104 will upgrade and wish only to follow the trail of spuious gain and amplitude, and do not influence the energy of signal when changing in gain and phase place.
The embodiment of the invention described above can realize on radio frequency-base band integrated chip.Shown in Figure 2 is the flow chart of realizing each step of the present invention.As mentioned above, for example, in 802.11g, 14 different channels or " fragment " are arranged, it has the different center frequency in the 2.4GHz frequency band range separately, for example from 2.412MHz to 2.480MHz.In order to realize embodiments of the invention, in step 2010, should determine to be about to move the channel of associative operation, and change the frequency of radio frequency band filter into determined channel.After this, no matter in based on the signal bandwidth of digital system clock, whether exist spuiously, also should determine harmonic wave, and if exist spuiously, then also should determine spuious frequency.In step 2020, determined spuious frequency after, should use this spurious frequency of determining to upgrade relevant register and tables of data.
In step 2030, do not having under the situation of signal, estimation device 104 was carried out the spuious amplitude and the estimation of phase place in the one predetermined very short period.In step 2040, spuious remover 100 freezes this estimation operation subsequently, and eliminates spuious before the permission packet signal enters.In step 2050, in case receive a packet signal, estimation device 104 will be eliminated spuious from this packet signal.In step 2060, be not used under the situation of the method for estimating spuious amplitude and phase place under the no signal situation, estimation device 104 can be always with spuious amplitude and the phase place of same adaptive frequency estimation.In step 2070, from the estimation beginning takes place until with the packet signal gain application to the packet signal during this period of time in, spuious arrester 100 uses gain delta to adjust the composition of estimation.In step 2080, in order to determine the variation of phase place, spuious arrester 100 is carried out the estimation of amplitude and phase place with the slow variable of trace signals in the packet signal receiving course.The carrying out that above-mentioned steps can repeat after each packet signal or predetermined a period of time.Because spuious intensity is the function of substrate temperature, so when variations in temperature, the amplitude that this is spuious and the estimated value of phase place will lose efficacy.Therefore, the preset time section can be set eliminates and may influence the spuious amplitude and the respective activity of phase estimation value.
In one embodiment of the invention, the present invention includes a spuious arrester, have an estimation device and a subtracter that is used for deducting from the input packet signal the spuious value of estimation that is used for estimating spuious amplitude and phase place at reasonable time.The present invention also comprises a renovator, is used for upgrading estimated value based on the signal level of input packet signal, dynamically to adjust the spuious amplitude that changes.The present invention may be used on the fixed clock signal and can produce on adjacent circuit in harmonic wave or the spuious any configuration, and more specifically, the present invention also may be used on the digital dock pulse in the twireless radio-frequency communication that radio frequency indication frequency operates.
More than describe and introduced specific embodiments of the invention.But clearly, can carry out variations and modifications and realize its some or all technique effects described embodiment.Therefore, claims have covered all changes and the embodiment that embodies true spirit of the present invention and scope.
Claims (10)
1. eliminate spuious and do not influence the network equipment of input signal for one kind, the described network equipment comprises:
An estimation device, spuious amplitude and the phase place of estimation in predetermined a period of time;
Processing unit freezes the described spuious amplitude and the further estimation of phase place, eliminates the spuious of estimation and allows the input packet signal to enter;
Deduct device, deduct the spuious of estimation the packet signal from input, wherein, spuious from the input packet signal, being deducted of described estimation and do not influence the input signal of the part of the spurious signal that does not belong to described estimation.
2. the network equipment according to claim 1 is characterized in that, the described network equipment comprises that further the initial estimate that is used for described spuious amplitude and phase place multiply by spuious index on the preset frequency to determine the spuious device of described estimation.
3. the network equipment according to claim 1 is characterized in that, described estimation device is a narrowband self-adaption filter, allows the energy on the described spurious frequency to enter, and the energy of every other signal is kept off in the outside.
4. the network equipment according to claim 1 is characterized in that, described estimation device estimation is not having described spuious amplitude and phase place under the situation of input signal.
5. the network equipment according to claim 1 is characterized in that, described spuious amplitude and phase place under the described interior identical adaptive frequency of estimation device estimation a period of time.
6. the network equipment according to claim 5 is characterized in that, described estimation device is a notch filter, with all the energy filterings on the spurious frequency.
7. the network equipment according to claim 1 is characterized in that, described estimation device is estimated described spuious amplitude and phase place in predetermined a period of time repeatedly.
8. the network equipment according to claim 1, it is characterized in that, the described network equipment further includes to be used to from the input packet signal of packet signal lead code determines a suitable gain, automatically with described gain application to described packet signal, and in described spuious amplitude and phase place estimation are begun during this section to packet signal the time with the packet signal gain application by the spuious device adjusted of gain delta to described estimation.
9. eliminate spuious and do not influence the method for input signal for one kind, described method comprises the steps:
Spuious amplitude and the phase place of estimation in predetermined a period of time;
Freeze the described spuious amplitude and the further estimation of phase place;
Eliminate the spuious of estimation;
Allow the input packet signal to enter;
Deduct the spuious of described estimation from input the packet signal, wherein, spuious from the input packet signal, being deducted of described estimation and do not influence the input signal of a spuious part that does not belong to described estimation.
10. eliminate spuious and do not influence the equipment of input signal for one kind, described equipment comprises:
Estimating device, spuious amplitude and the phase place of estimation in predetermined a period of time;
Freezing plant freezes the described spuious amplitude and the further estimation of phase place;
Cancellation element is eliminated the spuious of estimation;
Allow device, allow the input packet signal to enter;
Deduct device, deduct the spuious of described estimation the packet signal from input, wherein, spuious from the input packet signal, being deducted of described estimation and do not influence the input signal of the part of the spurious signal that does not belong to described estimation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US61879104P | 2004-10-15 | 2004-10-15 | |
| US60/618,791 | 2004-10-15 | ||
| US60/672,049 | 2005-04-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1773971A true CN1773971A (en) | 2006-05-17 |
| CN100502373C CN100502373C (en) | 2009-06-17 |
Family
ID=36760729
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101131006A Expired - Fee Related CN100502373C (en) | 2004-10-15 | 2005-10-13 | A network device and method for cancelling spurs without affecting an incoming signal |
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| CN (1) | CN100502373C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521271A (en) * | 2018-12-27 | 2019-03-26 | 京信通信系统（中国）有限公司 | A kind of signal sampling method and device |
| CN110337785A (en) * | 2017-01-13 | 2019-10-15 | 赛普拉斯半导体公司 | Spuious elimination system for modem |
| CN110383700A (en) * | 2017-03-10 | 2019-10-25 | 英特尔Ip公司 | Spuious reduction circuit and device, radio transceiver, mobile terminal, for spuious reduced method and computer program |
| CN113437965A (en) * | 2021-08-10 | 2021-09-24 | 新港海岸(北京)科技有限公司 | Spurious signal elimination circuit and method |
| CN114866099A (en) * | 2022-04-29 | 2022-08-05 | 上海星思半导体有限责任公司 | Filtering method and device and electronic equipment |
-
2005
- 2005-10-13 CN CNB2005101131006A patent/CN100502373C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110337785A (en) * | 2017-01-13 | 2019-10-15 | 赛普拉斯半导体公司 | Spuious elimination system for modem |
| CN110337785B (en) * | 2017-01-13 | 2020-12-01 | 赛普拉斯半导体公司 | Spur cancellation system for modems |
| CN110383700A (en) * | 2017-03-10 | 2019-10-25 | 英特尔Ip公司 | Spuious reduction circuit and device, radio transceiver, mobile terminal, for spuious reduced method and computer program |
| CN109521271A (en) * | 2018-12-27 | 2019-03-26 | 京信通信系统（中国）有限公司 | A kind of signal sampling method and device |
| CN109521271B (en) * | 2018-12-27 | 2021-06-22 | 京信通信系统（中国）有限公司 | Signal sampling method and device |
| CN113437965A (en) * | 2021-08-10 | 2021-09-24 | 新港海岸(北京)科技有限公司 | Spurious signal elimination circuit and method |
| CN113437965B (en) * | 2021-08-10 | 2022-03-25 | 新港海岸(北京)科技有限公司 | Spurious signal elimination circuit and method |
| US11595031B1 (en) | 2021-08-10 | 2023-02-28 | Newcosemi (Beijing) Technology Co., Ltd. | Circuit and method for eliminating spurious signal |
| CN114866099A (en) * | 2022-04-29 | 2022-08-05 | 上海星思半导体有限责任公司 | Filtering method and device and electronic equipment |
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|---|---|
| CN100502373C (en) | 2009-06-17 |
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