CN101277479A - Baseband feedback type self-excitation resistance module - Google Patents
Baseband feedback type self-excitation resistance module Download PDFInfo
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Abstract
The present invention provides a baseband feedback type self-exciting resistance module, connecting to the uplink and the downlink of a same frequency wireless repeater station, including a down conversion device, used for down transforming the link signal of the link to a baseband signal format from a radiofrequency signal format; a self-exciting elimination module, used for eliminating the self-exciting element of the link signal of the link, to output the baseband eliminating the self-exciting interfering signal; an upper conversion device, used for upper transforming the baseband signal of eliminating the self-exciting interfering signal to the radiofrequency signal. The invention ensures the same frequency wireless repeater station effectively adaptive eliminate the self-exciting interference produced by the feedback signal, reducing the needs of the isolations of front and back antennas, improving the system gain, enhancing the covering range of the repeater station, fit for systems such as GSM/CDMA/CDMA2000/WCDMA and the like; the invention employs a simple reference signal baseband feedback acquiring technology having lower cost, convenient for the realization of the repeater station.
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 baseband feedback type self-excitation resistance module.
[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 actual applications, 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 the engineering application, 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]
Purpose of the present invention will overcome above-mentioned deficiency exactly, provide a kind of elimination adaptively simple, low-cost, that be easy to realize 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 baseband feedback type self-excitation resistance module in the same wireless discharging-directly station frequently of being applied in of coverage.
The objective of the invention is to be achieved through the following technical solutions:
Baseband feedback type self-excitation resistance module of the present invention is connected in the uplink and downlink link with the frequency wireless discharging-directly station, comprising:
Down-conversion device is used for the link signal of affiliated link is downconverted to the baseband signal form from the radiofrequency signal form;
The self-excitation cancellation module is used for the autoexcitation composition at the affiliated link signal of base band level elimination, has eliminated the baseband signal that self-excitation is disturbed with output;
Means of upconversion is used for the described baseband signal of having eliminated the self-excitation interference is up-converted into radiofrequency signal.
Particularly, described self-excitation cancellation module comprises:
Sef-adapting filter is used for the approximation signal of baseband signal with aerial self-excitation interference signal subtracted each other, to obtain to have eliminated the baseband signal that self-excitation is disturbed;
Postponement module is used for and will have eliminated baseband signal time-delay that self-excitation disturbs with as exporting with reference to signal.
Wherein, described sef-adapting filter comprises:
The filtering submodule carries out adaptive-filtering to the baseband signal of down-conversion device input and the reference signal of Postponement module input, to produce described approximation signal;
The signal extraction submodule deducts described approximation signal with the baseband signal of down-conversion device input and has describedly eliminated the baseband signal that self-excitation disturbs and export means of upconversion and Postponement module to produce.
Described baseband signal can be multi-carrier signal or broadband signal.
Described down-conversion device specifically comprises:
Analog down converter is used for the link signal of affiliated link is mixed to the intermediate-freuqncy signal of analog format;
Automatically attenuation module is used for based on the decay controlling value described intermediate-freuqncy signal that decays;
Analog to digital converter is used for the intermediate-freuqncy signal after the decay is converted to number format;
Digital down converter is used for the digital medium-frequency signal of analog to digital converter output is downconverted to baseband signal;
The decay control module, the energy that is used for the reference signal that obtains based on described Postponement module calculates described decay controlling value.
Described means of upconversion specifically comprises:
Digital up converter is used for the baseband signal that the signal extraction submodule of self-excitation cancellation module is exported is up-converted into digital medium-frequency signal;
Digital to analog converter is used for the intermediate-freuqncy signal of digital up converter output is converted to analog format;
The simulation upconverter is used for the signal of described digital to analog converter output is up-converted into the radio frequency form.
Described self-excitation cancellation module and described decay control module are integrated in same FPGA or the dsp chip jointly.Described digital down converter and described 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.Described digital up converter and described 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.Reference signal that simultaneously should invention is by the baseband signal feedback generation of anti-self excitation module inside, realizes simply, with low cost, is convenient to the realization 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 analog down converter and simulation up-conversion part are not shown.
[embodiment]
The present invention is further illustrated below in conjunction with drawings and Examples:
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 link, constitute up link jointly by MT end duplexer 15, up amplification module 22,24, up anti-self excitation module 23 and DT end duplexer 11.
Upstream or downstream amplification module 12,14 can be the known equipment that is used for the signal amplification such as power amplifier module, low noise amplification module.
In the down link, donor antenna (not shown) is from being coupled to the radiofrequency signal of base station in the air, enter low noise amplification module 12 through DT end duplexer 11, in low noise amplification module 12 behind the noise of filtered signal, enter baseband feedback type self-excitation resistance module 13 of the present invention, after eliminating wherein 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 enters low noise amplification module 22 filter noise, enter baseband feedback type self-excitation resistance module 23 of the present invention and eliminate the autoexcitation composition, again after power amplifier module 24 amplifies, can through DT hold duplexer 11 by donor antenna with radio signal transmission to the base station.
Described baseband feedback type self-excitation resistance module of the present invention 13,23, the autoexcitation composition of link signal under being used to eliminate, this module in inside by to the elimination of output the baseband signal of self-excitation signal carry out feedback delay and obtain reference signal, pass through adaptive filter algorithm, base band level link signal and reference signal according to input are carried out the self adaptation real-time operation, thereby obtain the approximation signal of aerial self-excitation feedback signal, and then from the base band level link signal of input, deduct this approximation signal, thereby obtain to have eliminated the baseband signal of self-excitation feedback signal, this baseband signal can be that broadband signal also can be a multi-carrier signal, again this baseband signal is carried out up-conversion to radiofrequency signal, just finished its anti-self-excitation process; Simultaneously this baseband signal is postponed the back feedback as above-mentioned reference signal.In conjunction with Fig. 1 and Fig. 2, specifically, described anti-self excitation module 13,23 comprises down-conversion device, self-excitation cancellation module 34 and means of upconversion.
Described down-conversion device, be used for the link signal of affiliated link is downconverted to the baseband signal form from the radiofrequency signal form, as depicted in figs. 1 and 2, the down-conversion device of each anti-self excitation module 13,23 is by an analog down converter (131 in the line link as follows; In the up link 231) and 31, one analog to digital converters 32 of an automatic attenuation module and digital down converter 33 form:
Described analog down converter 131,231 is used for the radio frequency link signal of affiliated link (up link and down link) is mixed to respectively the intermediate-freuqncy signal of analog format, and this intermediate-freuqncy signal can be a broadband signal, also can be the multi-carrier signal through frequency-selecting.In the Uplink/Downlink, on analog down converter 131/231 is accepted/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 automatic attenuation module 31 that is used to handle the downstream signal decay;
Described automatic attenuation module 31 is used for based on decay controlling value decay intermediate frequency link signal.Automatically attenuation module 31 directly electrically connects with analog down converter 13/23, accepts the intermediate-freuqncy signal of Uplink/Downlink;
Analog to digital converter 32 is used for the intermediate-freuqncy signal after the decay is converted to number format, and also, analog to digital converter 32 electrically connects with attenuation module 31 automatically, with on after the decay/downstream signal carries out the modulus sampling, becomes the intermediate-freuqncy signal of number format;
Digital down converter 33 is used for the digital medium-frequency signal of analog to digital converter 32 outputs is downconverted to baseband signal.Digital down converter 33 electrically connects 32 with analog to digital converter, with analog to digital converter 32 transmission come on/downstream signal downconverts to digital baseband signal;
Decay control module 30 electrically connects with automatic attenuation module 31, is used for calculating pad value and exporting automatic attenuation module 31 simultaneously to based on the reference signal of base band level.Decay control module 30 is calculated according to carrying out energy from the digital reference baseband signal that obtains by baseband feedback, produces suitable decay controlling value according to the energy value that obtains, the output control signal, thus control automatic attenuation module.
Described self-excitation cancellation module 34, the autoexcitation composition that is used for link link signal under base band level is eliminated, eliminated the baseband signal of self-excitation interference signal with output, the Postponement module 341 that it specifically comprises sef-adapting filter 340 and is used to produce the baseband feedback reference signal:
Sef-adapting filter 340, handle the work of two steps, one, pass through adaptive filter algorithm, carry out the self adaptation real-time operation according to the base band level link signal of digital down converter 33 inputs and the reference signal of baseband feedback reference signal generation module 341 outputs, thereby obtain the approximation signal of aerial self-excitation feedback signal, this a part of function can be by filtering submodule (not shown) realization separately more specifically; They are two years old, from the base band level link signal of digital down converter 33 inputs, deduct this approximation signal again, thereby obtain to have eliminated the baseband signal of self-excitation feedback signal, this baseband signal can be that multi-carrier signal also can be a broadband signal, and this part then can be realized by a signal extraction submodule (not shown) separately; Sef-adapting filter 340 is by its filtering submodule and following Postponement module 341 electric connections, accept the wherein input of the reference signal of base band level, simultaneously sef-adapting filter 340 also is connected with digital up converter 35 by its signal extraction submodule, with the elimination of acquisition the baseband signal of self-excitation feedback signal output to digital up converter 35;
Postponement module 341, with the elimination of the signal extraction submodule of sef-adapting filter 340 output the baseband signal to be transmitted of self-excitation feedback signal through suitably postponing the back as with reference to signal, and this reference signal is fed back to sef-adapting filter 340 and exports to the control module 30 that decays; This baseband feedback technology directly produces in that self-excitation cancellation module 34 is inner, and is simple, cost is low, helps the realization of repeater;
Means of upconversion, the baseband signal that is used for handling back output by described self-excitation cancellation module 34 is up-converted into radiofrequency signal.As depicted in figs. 1 and 2, in first link, described means of upconversion comprises digital up converter 35, digital to analog converter 36 and simulation upconverter 132/232.
Described digital up converter 35 with sef-adapting filter 340 electric connections of described self-excitation cancellation module 34, is used for the baseband signal of self-excitation cancellation module 34 outputs is up-converted into digital medium-frequency signal;
Digital to analog converter 36 electrically connects with described digital up converter 35, is used for the intermediate-freuqncy signal of digital up converter 35 outputs is converted to analog format;
Simulation upconverter 132,232 electrically connects with digital to analog converter 36, is used for the signal of described digital to analog converter 36 outputs is up-converted into the radio frequency form.
In described baseband feedback type self-excitation resistance module of the present invention, described self-excitation cancellation module 34 is integrated in a FPGA or the dsp chip simultaneously with described decay control module 30; Described analog to digital converter 32 and described digital down converter 33 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 that digital down converter 33 is realized in fpga chip or dsp chip and analog to digital converter 32 still adopts the special chip realization.
In like manner, described digital up converter 35 and digital to analog converter 36 can use special chip to realize respectively, also can separately realize, digital up converter 35 also can be realized by FPGA or dsp chip.
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 Digital Television through suitable improvement.This invention is adopted simply simultaneously, the reference signal baseband feedback is obtained technology cheaply, is convenient to the realization of repeater.
The present invention is described in 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 (9)
1. a baseband feedback type self-excitation resistance module is connected in the uplink and downlink link of repeater, it is characterized in that comprising:
Down-conversion device is used for the link signal of affiliated link is downconverted to the baseband signal form from the radiofrequency signal form;
The self-excitation cancellation module is used for the autoexcitation composition at the affiliated link signal of base band level self adaptation elimination, has eliminated the baseband signal that self-excitation is disturbed with output;
Means of upconversion is used for the described baseband signal of having eliminated the self-excitation interference is up-converted into radiofrequency signal.
2. baseband feedback type self-excitation resistance module according to claim 1 is characterized in that described self-excitation cancellation module comprises:
Sef-adapting filter is used for the approximation signal of baseband signal with aerial self-excitation interference signal subtracted each other, to obtain to have eliminated the baseband signal that self-excitation is disturbed;
Postponement module is used for and will have eliminated baseband signal time-delay that self-excitation disturbs with as exporting with reference to signal.
3. baseband feedback type self-excitation resistance module according to claim 2 is characterized in that described sef-adapting filter comprises:
The filtering submodule carries out adaptive-filtering to the baseband signal of down-conversion device input and the reference signal of Postponement module input, to produce described approximation signal;
The signal extraction submodule deducts described approximation signal with the baseband signal of down-conversion device input and has describedly eliminated the baseband signal that self-excitation disturbs and export means of upconversion and Postponement module to produce.
4. baseband feedback type self-excitation resistance module according to claim 3 is characterized in that: described baseband signal can be multi-carrier signal or broadband signal.
5. according to any described baseband feedback type self-excitation resistance module in the claim 1 to 4, it is characterized in that described down-conversion device comprises:
Analog down converter is used for the link signal of affiliated link is mixed to the intermediate-freuqncy signal of analog format;
Automatically attenuation module is used for based on the decay controlling value described intermediate-freuqncy signal that decays;
Analog to digital converter is used for the intermediate-freuqncy signal after the decay is converted to number format;
Digital down converter is used for the digital medium-frequency signal of analog to digital converter output is downconverted to baseband signal;
The decay control module, the energy that is used for the reference signal that obtains based on described Postponement module calculates described decay controlling value.
6. baseband feedback type self-excitation resistance module according to claim 5 is characterized in that described means of upconversion comprises:
Digital up converter is used for the baseband signal that the signal extraction submodule of self-excitation cancellation module is exported is up-converted into digital medium-frequency signal;
Digital to analog converter is used for the intermediate-freuqncy signal of digital up converter output is converted to analog format;
The simulation upconverter is used for the signal of described digital to analog converter output is up-converted into the radio frequency form.
7. baseband feedback type self-excitation resistance module according to claim 6 is characterized in that: described self-excitation cancellation module and described decay control module are integrated in same FPGA or the dsp chip jointly.
8. baseband feedback type self-excitation resistance module according to claim 7, it is characterized in that: described digital down converter and described 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.
9. baseband feedback type self-excitation resistance module according to claim 8, it is characterized in that: described digital up converter and described 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.
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| CN2007100273390A CN101277479B (en) | 2007-03-29 | 2007-03-29 | Baseband feedback type self-excitation resistance module |
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| CN2007100273390A CN101277479B (en) | 2007-03-29 | 2007-03-29 | Baseband feedback type self-excitation resistance module |
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| CN101277479A true CN101277479A (en) | 2008-10-01 |
| CN101277479B CN101277479B (en) | 2011-07-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111163023A (en) * | 2019-12-27 | 2020-05-15 | 京信通信系统（中国）有限公司 | Self-excitation eliminating device, isolation degree detection method, access unit and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19611342A1 (en) * | 1996-03-22 | 1997-09-25 | Mikom Gmbh | Repeater arrangement |
| CN2800676Y (en) * | 2004-11-08 | 2006-07-26 | 京信通信系统（广州）有限公司 | WCDMA dual carrier frequency-selecting repeater system with self-excitation automatic eliminating function |
| CN200997608Y (en) * | 2006-12-21 | 2007-12-26 | 京信通信技术(广州)有限公司 | Module against self excitation for high-frequency station system |
| CN101207430B (en) * | 2006-12-21 | 2012-05-23 | 京信通信技术(广州)有限公司 | Anti-self excitation module of straight amplification station system |
| CN201039179Y (en) * | 2007-03-29 | 2008-03-19 | 京信通信系统（中国）有限公司 | Base band feedback self-excitation resistance module |
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- 2007-03-29 CN CN2007100273390A patent/CN101277479B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111163023A (en) * | 2019-12-27 | 2020-05-15 | 京信通信系统（中国）有限公司 | Self-excitation eliminating device, isolation degree detection method, access unit and system |
| WO2021129810A1 (en) * | 2019-12-27 | 2021-07-01 | 京信网络系统股份有限公司 | Self-excitation elimination apparatus, isolation detection method, access unit and system |
| CN111163023B (en) * | 2019-12-27 | 2021-09-03 | 京信网络系统股份有限公司 | Self-excitation eliminating device, isolation degree detection method, access unit and system |
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