CN101207430B - Self-excitation resisting module of repeater system - Google Patents
Self-excitation resisting module of repeater system Download PDFInfo
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- CN101207430B CN101207430B CN2006101243256A CN200610124325A CN101207430B CN 101207430 B CN101207430 B CN 101207430B CN 2006101243256 A CN2006101243256 A CN 2006101243256A CN 200610124325 A CN200610124325 A CN 200610124325A CN 101207430 B CN101207430 B CN 101207430B
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Abstract
The invention discloses a self-excitation resisting module of a repeater system, which is connected to an uplink and a downlink of a same-frequency wireless repeater and comprises the following components: the reference signal generating module is used for coupling a path of radio frequency signals to be output in the link as a reference signal; down-conversion means for down-converting the link signal and the reference signal in the link from a radio frequency signal format to a baseband signal format; the self-excitation elimination module is used for eliminating the self-excitation component of the link signal in the link at the baseband level based on the reference signal so as to output a multi-carrier baseband signal with the self-excitation interference signal eliminated; an up-conversion device for up-converting the multi-carrier baseband signal into a radio frequency signal. The invention can make the same frequency wireless repeater effectively self-adaptively eliminate the self-excitation interference generated by the feedback signal, reduce the requirement on the isolation of the front and the back antennas, improve the system gain, enlarge the coverage area of the repeater, and is suitable for systems such as GSM/CDMA/CDMA2000/WCDMA and the like.
Description
[technical field]
The present invention relates to moving communicating field, relate in particular to in the frequency wireless discharging-directly station a kind of anti-self excitation module of straight amplification station system.
[background technology]
Adopt duplexer to carry out the switching of uplink downlink with the frequency wireless discharging-directly station more; Utilize forward facing antenna to receive the base station down signal; Through low noise amplifier useful signal is amplified; Again behind the narrow band filter multiple filter further with power amplifier with power amplification, be transmitted into travelling carriage by rearward-facing antenna; Utilize rearward-facing antenna receiving mobile upward signal simultaneously, be transmitted into the base station through low noise amplifier, narrow band filter, power amplifier.Its advantage is: with the cost increase coverage territory far below the base station investment, mounting condition is simple, can enlarge network coverage face fast; Improve the utilization rate of equipment and installations of base station, improve the covering quality of existing Cellular Networks.
But in practical application; With wireless discharging-directly station is nearer owing to forward and backward antenna infield frequently, be coupled inevitably, if system gain is too big; During greater than the isolation between the forward and backward antenna of repeater; Self-oscillation will take place in the repeater, causes the base stations control channel block, even causes the base station paralysis.
In with the frequency radio repeater system; The formed interference source of this feedback signal; Can cause the receiver system performance decrease; And then make that the system gain of frequency wireless discharging-directly station hangs down about 10～15dB than the isolation between transmitting antenna and reception antenna usually together, can influence the covering power of direct discharging station so again.In order to improve with the system gain of wireless discharging-directly station frequently, just need to improve the isolation between the dual-mode antenna, so just formed a pair of contradiction with aforementioned, in practical applications, be difficult to realization usually.Therefore,, enlarge its coverage, need suitable technique and suppress or eliminate the self-excitation interference that feedback signal produces in order to improve system gain with the frequency wireless discharging-directly station.
[summary of the invention]
The object of the invention will overcome above-mentioned deficiency exactly; Provide a kind of can the elimination adaptively to disturb with the self-excitation that feedback signal produced in the frequency wireless discharging-directly station; Reduce dependence to forward and backward antenna high-isolation; Improve system gain, increase the anti-self excitation module of straight amplification station system in the same wireless discharging-directly station frequently of being applied in of coverage.
The objective of the invention is to realize through following technical scheme:
Anti-self excitation module of straight amplification station system of the present invention is connected in the uplink and downlink link with the frequency wireless discharging-directly station, comprising:
The reference signal generation module, the radiofrequency signal that is used for being about to output in affiliated link coupling one tunnel is signal as a reference;
Down-conversion device is used for the link signal and the said reference signal of affiliated link are downconverted to the baseband signal form from the radiofrequency signal form;
The self-excitation cancellation module is used for having eliminated the multicarrier baseband signal of self-excitation interference signal with output at the autoexcitation composition of base band level based on the affiliated link link signal of said reference signal elimination;
Means of upconversion is used for said multicarrier baseband signal is up-converted into radiofrequency signal.
Wherein, said self-excitation cancellation module comprises:
Filter is used to use up-to-date coefficient that the reference signal of said base band level is carried out digital filtering, to obtain the approximation signal of aerial self-excitation feedback signal;
Error signal produces submodule, is used for the link signal of base band level is deducted said approximation signal, obtains to have eliminated the error signal of self-excitation feedback signal, to export as the multicarrier baseband signal;
The filter coefficient update submodule is used to utilize the up-to-date coefficient of error signal calculation filter, and is transferred to said filter.
More specifically, said filter coefficient update submodule comprises:
Energy calculation unit is used for the link signal of base band level to input and carries out energy and calculate;
Computing unit reciprocal is used to calculate the inverse of link signal energy;
The product computing unit, it is reciprocal long-pending to be used for error signal and energy;
The incremental computations unit is used for the more new increment of calculating filter coefficient;
The filter coefficient computing unit is used for former coefficient of calculating filter and said more new increment sum and exports said filter to.
Preferably, the filter of said self-excitation cancellation module is the FIR filter.
Further, said down-conversion device comprises:
Analog down converter is used for the intermediate-freuqncy signal that link signal and reference signal with affiliated link are mixed to analog format respectively, and the intermediate-freuqncy signal of output can be a broadband signal, also can be the multi-carrier signal after the frequency-selecting;
Two automatic attenuation module are used for based on decay controlling value decay respectively intermediate frequency link signal and intermediate frequency reference signal;
Two analog to digital converters, two kinds of intermediate-freuqncy signals after being used for will decaying respectively convert number format into;
Digital down converter, the digital medium-frequency signal that is used for respectively two analog to digital converters being exported downconverts to baseband signal;
The decay control module is used for calculating pad value and exporting two automatic attenuation module simultaneously to based on the reference signal of base band level.
Particularly, said decay control module then comprises:
The calculating energy unit is used to calculate the energy from the reference signal of digital down converter acquisition;
The self-excitation judgement unit is used for the energy of reference signal is compared with preset thresholding, to differentiate the self-excitation state that whether is in;
The pad value generation unit is used for producing pad value and exporting two automatic attenuation module to according to differentiating the result.
Said means of upconversion then comprises:
Digital up converter is used for the baseband signal of self-excitation cancellation module output is up-converted into digital medium-frequency signal, and this signal can be a broadband signal, also can be multi-carrier signal;
Digital to analog converter is used for converting the intermediate-freuqncy signal of digital up converter output into analog format;
The simulation upconverter is used for the signal of said digital to analog converter output is up-converted into the radio frequency form.
Said self-excitation cancellation module and said decay control module are integrated in same FPGA or the dsp chip jointly.Said digital down converter and said analog to digital converter can use special chip to realize respectively; Also can use a slice to have the special chip of analog to digital converter and Digital Down Convert function to realize, also can be that Digital Down Convert realizes in fpga chip or dsp chip and analog to digital converter still uses the special chip realization.。Said digital up converter and said digital to analog converter can use special chip to realize respectively; Also can use a slice to have the special chip of Digital Up Convert and digital-analog converter function to realize simultaneously, also can be that Digital Up Convert realizes in fpga chip or dsp chip and digital to analog converter still uses special chip.
Compared with prior art; The present invention possesses following advantage: the present invention can make it applied with the radio repeater system self adaptation elimination self-excitation that feedback signal produced interference effectively frequently; Reduce demand to the forward and backward isolation between antennas; Improve system gain, increase the coverage of repeater.
[description of drawings]
Theory diagram when Fig. 1 is applied to the frequency radio repeater system for the present invention;
Fig. 2 is a theory diagram of the present invention, and wherein the analog down converter part is not shown.
[embodiment]
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Please combine Fig. 1 and Fig. 2, Fig. 1 is a theory diagram of having used the same frequency wireless discharging-directly station of anti-self excitation module of straight amplification station system of the present invention, and Fig. 2 is a theory diagram of the present invention, but analog down converter wherein is shown in Fig. 1.
Among Fig. 1; By DT end duplexer 11, descending amplification module 12; 14, descending anti-self excitation module 13, MT end duplexer 15 constitute down links, constitute up links by MT end duplexer 15, up amplification module 22,24, up anti-self excitation module 23 and DT end duplexer 11 are common.
Wherein, the uplink and downlink amplification module 22,24,12; 14 can be low noise amplification module 12,22 or power amplifier module 14,24, preferably; As shown in Figure 1, before the anti-self excitation module 13,23 in the uplink and downlink link low noise amplification module 12 is set; 22, power amplifier module 14,24 then is set thereafter.Also can only establish an amplification module in the upstream or downstream link, also can set up a plurality ofly, be decided according to the actual requirements.
In the down link; Donor antenna (not shown) gets into low noise amplification modules 12 through DT end duplexer 11 from being coupled to the radiofrequency signal of base station in the air, in low noise amplification module 12 behind the noise of filtered signal; Get into anti-self excitation module 13; Eliminate wherein by behind the self-energizing composition of cover antenna (not shown), after amplifying through power amplifier module 14 again, can hold duplexer 15 radiofrequency signal to be retransmitted to travelling carriage through MT by cover antenna.
In like manner; In the up link; The upward signal that cover antenna is coupled to is after MT end duplexer 15 gets into low noise amplification module 22 filter noise; Get into anti-self excitation module 23 and eliminate the autoexcitation compositions, again after power amplifier module 24 amplifies, can through DT hold duplexer 11 by donor antenna with radio signal transmission to the base station.
Said anti-self excitation module 13,23, the autoexcitation composition of link signal under being used to eliminate; The radiofrequency signal that is about to output through coupling one tunnel in affiliated link is signal as a reference, downconverts to baseband signal, in base band level to its filtering; After driver unit is come from filtering, deduct the autoexcitation part, promptly become error signal with the signal of flowing through in the affiliated link; The elimination that just hope to obtain the baseband signal of self-excitation signal; This baseband signal can be that broadband signal also can be a multi-carrier signal, and this baseband signal is carried out up-conversion to radiofrequency signal, has just accomplished its anti-self-excitation process.In conjunction with Fig. 1 and Fig. 2, specifically, said anti-self excitation module 13,23 comprises reference signal generation module, down-conversion device, self-excitation cancellation module 34 and means of upconversion.
Said reference signal generation module; It is connected with DT end duplexer 11 in up link; The up radiofrequency signal that is about to output from 11 couplings one tunnel of DT end duplexer is signal as a reference; And in down link the time, then is connected with MT end duplexer 15, the downlink radio-frequency signal that is about to export from 15 couplings one tunnel of MT end duplexer is signal as a reference.
Down-conversion device; Be used for the link signal and the said reference signal of affiliated link are downconverted to the baseband signal form from the radiofrequency signal form, as depicted in figs. 1 and 2, each anti-self excitation module 13; 23 down-conversion device is by two analog down converter (131,133 in line link as follows; In the up link 231,233) and two automatic attenuation module 31,37, two analog to digital converters 32,38 and two digital down converters 33,39 form:
Said analog down converter 131; 133; 231,233, be used for the intermediate-freuqncy signal that radio frequency link signal and radio frequency reference signal with affiliated link (up link and down link) are mixed to analog format respectively; The intermediate-freuqncy signal of output can be a broadband signal, also can be the multi-carrier signal after the frequency-selecting.In the Uplink/Downlink; On/descending first analog down converter 131,231 accepts/input of the radiofrequency signal of descending low noise amplifier 12,22; Carry out mixing, and the intermediate-freuqncy signal of final output simulation is to the first automatic attenuation module 31 that is used to handle the downstream signal decay.Be used for handling second analog down converter 133 of Uplink/Downlink reference signal; To hold duplexer 11 by DT/MT for 233; 15 couplings and conversion of signals be analog if signal, export the second automatic attenuation module 37 that is used to handle the reference signal decay then to;
Said two automatic attenuation module 31,37 are used for based on pad value decay respectively intermediate frequency link signal and intermediate frequency reference signal.The first automatic attenuation module 31 is connected 131 with first analog down converter, accepts the intermediate-freuqncy signal of Uplink/Downlink; 37 of the second automatic attenuation module are connected with second analog down converter 133 accepts its intermediate-freuqncy signal;
Two analog to digital converters 32,38, two kinds of intermediate-freuqncy signals after being used for will decaying respectively convert number format into; Also be; First analog to digital converter 32 is connected with the first automatic attenuation module 31, with on after the decay/downstream signal carries out modulus sampling, becomes the intermediate-freuqncy signal of number format; Second analog to digital converter 38 is connected with the second automatic attenuation module 37, with the decay after on/downlink reference signal is a number format through the modulus sample conversion;
Two digital down converters 33,39, the digital medium-frequency signal that is used for respectively two analog to digital converters 32,38 being exported downconverts to baseband signal.Wherein, first digital down converter 33 is connected 32 with first analog to digital converter, with the transmission of first analog to digital converter 32 come on/downstream signal downconverts to digital baseband signal; Second digital down converter 39 is connected with second analog to digital converter 38, and the reference signal in the Uplink/Downlink that 38 transmission of second analog to digital converter are next downconverts to digital baseband signal;
The calculating energy unit is used to calculate the energy from the reference signal of second digital down converter, 39 acquisitions;
The self-excitation judgement unit is used for the energy of reference signal is compared with preset thresholding, to differentiate the self-excitation state that whether is in;
The pad value generation unit is used for producing pad value and exporting two automatic attenuation module 31,37 to according to differentiating the result.
Its step that produces pad value is following:
(1) initial count value that pre-sets calculator is cnt=0, pad value ATTv=MAX
(2) the calculating energy unit calculates the energy pow of the MT end/DT terminal number word of input with reference to baseband signal by following formula
(3) the self-excitation judgement unit with energy pow and the thresholding T that pre-sets relatively, if pow >=T then get into step (1); Otherwise get into step (4)
(4) whether the pad value generation unit judges cnt greater than maximum, if not cnt=cnt+1 then, gets into step (2), otherwise cnt=0, and judging whether ATTv greater than minimum value, the words that are are ATTv=ATTv-1 then, gets into step (2) then.
Said self-excitation cancellation module 34; The autoexcitation composition that is used for link link signal under base band level is eliminated based on said reference signal; Eliminated the multicarrier baseband signal of self-excitation interference signal with output, it comprises that specifically filter 340, error signal produce submodule 342 and filter coefficient update submodule 341:
Error signal produces submodule 342; Be connected respectively with said first digital frequency converter 33, filter 340, filter coefficient update submodule 341 and Digital Up Convert module 35; Be used for the input of first digital frequency converter 33/downlink double/multi-load wave number word baseband signal deducts the approximation signal by said filter 340 inputs respectively; The digital baseband look for transmissions signal of self-excitation feedback signal has been eliminated in acquisition; Be referred to as error signal, the error signal of acquisition outputs to filter coefficient update submodule 341 and Digital Up Convert module 35 respectively;
Filter coefficient update submodule 341 is based on the principle of adaptive filter algorithm; Through to the error signal that produces the submodule input by error signal and on/descending digital baseband reference signal carries out corresponding computing; The required up-to-date coefficient of filtering when the filter 340 that the self adaptation real-time update is attached thereto carries out filtering; Make the signal of filter 340 outputs approach aerial self-excitation feedback signal, filter coefficient update submodule 341 comprises like lower unit:
Energy calculation unit is used for the link signal of base band level to input and carries out energy and calculate;
Computing unit reciprocal is used to calculate the inverse of link signal energy;
The product computing unit, it is reciprocal long-pending to be used for error signal and energy;
The incremental computations unit is used for the more new increment of calculating filter coefficient;
The filter coefficient computing unit is used for former coefficient of calculating filter and said more new increment sum and exports said filter 340 to.
Corresponding calculation step when specifically, carrying out filter coefficient update is following:
(1) by following formula the following/upstream digital base band reference signal of input being carried out energy by energy calculation unit calculates
(2) by the 1/p reciprocal of computing unit calculating energy reciprocal
n
(3) produce the error signal of submodule input and the product of energy inverse by product computing unit error signal
(1/p
n)·e
n
(4) by the more new increment of incremental computations unit calculating filter coefficient
[(1/p
n)·e
n]·(x
L-1-m n)
*
(5) by the filter coefficient computing unit new increment is more carried out obtaining current renewal increment Delta w behind the suitable cut position
n, with the coefficients w after the acquisition renewal after the up-to-date coefficient addition of filter to be updated
n
Means of upconversion is used for the baseband signal of handling back output by said self-excitation cancellation module 34 is up-converted into radiofrequency signal.As depicted in figs. 1 and 2, in first link, said means of upconversion comprises digital up converter 35, digital to analog converter 36 and simulation upconverter 132,232.
Said digital up converter 35; Producing submodule 342 with the error signal of said self-excitation cancellation module 34 is connected; Be used for the baseband signal of self-excitation cancellation module 34 outputs is up-converted into digital medium-frequency signal, this signal can be a broadband signal, also can be multi-carrier signal;
Digital to analog converter 36 is connected with said digital up converter 35, is used for converting the intermediate-freuqncy signal of digital up converter 35 outputs into analog format;
Simulation upconverter 132,232 is connected with digital to analog converter 36, is used for the signal of said digital to analog converter 36 outputs is up-converted into the radio frequency form.
Thus, with in the radio repeater system frequently, on/downstream signal gets into through cover antenna/donor antenna; Behind MT end/DT end duplexer 15,11, at up/descending low noise amplifier 22; Its noise section of filtering in 12, pass through then said on/descending anti-self excitation module 23,13 handles.Anti-self excitation module 23; In 13; On the one hand by second analog down converter 233,133 will hold from DT/ link signal that MT end duplexer 11,15 is coupled to converts analog if signal into; Decay, convert number format into according to the error amount that decay control module 30 produces through the second automatic attenuation module 37 through second analog to digital converter 38; Be downconverted into reference to baseband signal by the intermediate-freuqncy signal of second digital down converter 39 again, in decay control module 39, produce the pad value of the automatic attenuation module 31,37 of control number format; The filter factor that in the FIR of self-excitation cancellation module 34 filter 340, relies on 341 generations of filter coefficient update submodule simultaneously carries out filtering, and the error signal that filtered result exports self-excitation cancellation module 34 to produces in the submodule 342; In like manner; On the other hand; By first analog down converter 231; 131 radiofrequency signals that will from Uplink/Downlink, obtain downconvert to analog if signal, and behind the first automatic attenuation module 31, first analog to digital converter 32, first digital down converter 33, the error signal of directly directly going in the self-excitation cancellation module 34 produces in the submodule 342.After error signal generation submodule 342 will deduct the approximation signal by filter 340 inputs by the signal of first digital down converter, 33 inputs; Output error signal is as the multicarrier baseband signal of having eliminated self-excitation signal, with this multicarrier baseband signal through digital up converter 35 up-conversions to intermediate-freuqncy signal, in digital to analog converter 36, convert number format to; Again through simulation upconverter 232; 132 convert intermediate-freuqncy signal into radiofrequency signal, send into/after this radiofrequency signal being amplified in the downlink power amplifier 24,14; Transferring to donor antenna/cover antenna through DT end/MT end duplexer 11,15 launches.
In said anti-self excitation module 13,23, said self-excitation cancellation module 34 is integrated in a FPGA or the dsp chip with said decay control module 30 simultaneously; Said analog to digital converter 32; 38 with said digital down converter 33; 39 can adopt special chip to realize respectively, also can use a slice to have the special chip of modulus sampling and Digital Down Convert function to realize, also can be digital down converters 33; 39 realize in fpga chip or dsp chip and analog to digital converter 32,38 still adopts special chip to realize.
In like manner, said digital up converter 35 can use special chip to realize respectively with digital to analog converter 36, also can separately realize, digital up converter 35 also can be realized by a slice FPGA or dsp chip.
As everyone knows; The repeater also comprises Monitor And Control Subsystem 4 and power subsystem 5, and Monitor And Control Subsystem 4 is responsible for the various states of repeater are monitored, and state that can the teletransmission system is given Surveillance center; And can accept various parameter settings to system, comprise said pad value etc. is set; And power subsystem 5 is responsible for the repeater is supplied power.
The present invention has overcome in the repeater because the defective that the autoexcitation signal produces; Improved the coverage of repeater indirectly; Be applicable to the direct discharging station of system such as GSM/CDMA/CDMA2000/WCDMA, can also be applied to systems such as TD-SCDMA direct discharging station and DTV through suitable improvement.
The present invention describes with narrative mode all the time, and wherein employed term is intended to describe and unrestricted.According to above description, can make many further modifications to the present invention, also can do many variations according to actual needs.Therefore, in additional claim scope, the present invention can adopt various implementation to specifically described embodiment.
Claims (10)
1. an anti-self excitation module of straight amplification station system is connected in the uplink and downlink link of repeater, it is characterized in that comprising:
The reference signal generation module, the radiofrequency signal that is used for being about to output in affiliated link coupling one tunnel is signal as a reference;
Down-conversion device is used for the link signal and the said reference signal of affiliated link are downconverted to the baseband signal form from the radiofrequency signal form;
The self-excitation cancellation module is used for having eliminated the multicarrier baseband signal of self-excitation interference signal with output at the autoexcitation composition of base band level based on the affiliated link link signal of said reference signal elimination;
Means of upconversion is used for said multicarrier baseband signal is up-converted into radiofrequency signal.
2. anti-self excitation module of straight amplification station system according to claim 1 is characterized in that said self-excitation cancellation module comprises:
Filter is used to use up-to-date coefficient that the reference signal of said base band level is carried out digital filtering, to obtain the approximation signal of aerial self-excitation feedback signal;
Error signal produces submodule, is used for the link signal of base band level is deducted said approximation signal, obtains to have eliminated the error signal of self-excitation feedback signal, to export as the multicarrier baseband signal;
The filter coefficient update submodule is used to utilize the up-to-date coefficient of error signal calculation filter, and is transferred to said filter.
3. anti-self excitation module of straight amplification station system according to claim 2 is characterized in that said filter coefficient update submodule comprises:
Energy calculation unit is used for the link signal of base band level to input and carries out energy and calculate;
Computing unit reciprocal is used to calculate the inverse of link signal energy;
The product computing unit, it is reciprocal long-pending to be used for error signal and energy;
The incremental computations unit is used for the more new increment of calculating filter coefficient;
The filter coefficient computing unit is used for former coefficient of calculating filter and said more new increment sum and exports said filter to.
4. anti-self excitation module of straight amplification station system according to claim 3 is characterized in that: the filter of said self-excitation cancellation module is the FIR filter.
5. according to any described anti-self excitation module of straight amplification station system in the claim 1 to 4, it is characterized in that said down-conversion device comprises:
Analog down converter is used for the intermediate-freuqncy signal that link signal and reference signal with affiliated link are mixed to analog format respectively, and the intermediate-freuqncy signal of output is broadband signal or is the multi-carrier signal after the frequency-selecting;
Two automatic attenuation module are used for based on decay controlling value decay respectively intermediate frequency link signal and intermediate frequency reference signal;
Two analog to digital converters, two kinds of intermediate-freuqncy signals after being used for will decaying respectively convert number format into;
Digital down converter, the digital medium-frequency signal that is used for respectively two analog to digital converters being exported downconverts to baseband signal;
The decay control module is used for calculating pad value and exporting two automatic attenuation module simultaneously to based on the reference signal of base band level.
6. anti-self excitation module of straight amplification station system according to claim 5 is characterized in that said decay control module comprises:
The calculating energy unit is used to calculate the energy from the reference signal of digital down converter acquisition;
The self-excitation judgement unit is used for the energy of reference signal is compared with preset thresholding, to differentiate the self-excitation state that whether is in;
The pad value generation unit is used for producing pad value and exporting two automatic attenuation module to according to differentiating the result.
7. anti-self excitation module of straight amplification station system according to claim 5 is characterized in that said means of upconversion comprises:
Digital up converter is used for the baseband signal of self-excitation cancellation module output is up-converted into digital medium-frequency signal, and this signal is broadband signal or is multi-carrier signal;
Digital to analog converter is used for converting the intermediate-freuqncy signal of digital up converter output into analog format;
The simulation upconverter is used for the signal of said digital to analog converter output is up-converted into the radio frequency form.
8. anti-self excitation module of straight amplification station system according to claim 5 is characterized in that: said self-excitation cancellation module and said decay control module are integrated in same FPGA or the dsp chip jointly.
9. according to claim 7 or 8 described anti-self excitation module of straight amplification station system; It is characterized in that: said digital down converter and said analog to digital converter use special chip to realize respectively; Or use a slice to have the special chip of analog to digital converter and Digital Down Convert function to realize, or Digital Down Convert realizes in fpga chip or dsp chip and analog to digital converter still uses the special chip realization.
10. according to claim 7 or 8 described anti-self excitation module of straight amplification station system; It is characterized in that: said digital up converter and said digital to analog converter use special chip to realize respectively; Or use a slice to have the special chip of Digital Up Convert and digital-analog converter function to realize simultaneously, or Digital Up Convert realizes in fpga chip or dsp chip and digital to analog converter still uses special chip.
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| CN101277479B (en) * | 2007-03-29 | 2011-07-27 | 京信通信系统（中国）有限公司 | Baseband feedback type self-excitation resistance module |
| CN101369881B (en) * | 2008-09-27 | 2011-09-14 | 京信通信系统（中国）有限公司 | Multi-carrier digital frequency-selection system and its signal processing method |
| CN102045098B (en) * | 2010-12-03 | 2014-05-28 | 东莞电子科技大学电子信息工程研究院 | Power control based fast convergence adaptive method in internet connection sharing (ICS) repeater |
| CN111092633B (en) * | 2019-12-20 | 2021-05-18 | 成都大学 | A system and method for improving the excitation distance of backscatter communication by transmitting and receiving separation |
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