CN104301003B - A kind of digital microwave far-drawing system - Google Patents
A kind of digital microwave far-drawing system Download PDFInfo
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- CN104301003B CN104301003B CN201410583554.9A CN201410583554A CN104301003B CN 104301003 B CN104301003 B CN 104301003B CN 201410583554 A CN201410583554 A CN 201410583554A CN 104301003 B CN104301003 B CN 104301003B
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Abstract
Digital microwave far-drawing system of the present invention is operated in hyper band, and radio wave diffraction ability is stronger, can, with less equipment cost, meet the demand of remote beyond-the-horizon communication, can also guarantee the transmitting of information under over the horizon transmission variable-parameter channel; Digital microwave far-drawing system of the present invention can be realized feedback cancellation without channel is estimated, practical under varying Channels condition.
Description
Technical field
The present invention relates to microwave communication field, relate in particular to a kind of digital microwave far-drawing system.
Background technology
At present, there is communication dead band in the ionospheric impact of short wave communication, and station telecommunication distance is generally no more than 30km, and defendsStar communication is because its cost costliness cannot be used in a large number. The communication equipment of low cost, lightweight, use function versatile and flexible is more nextMore be subject to attracting attention of people. Therefore, development of miniaturized, lightness, low cost lightweight equipment solve short-distance and medium-distance wireless communicationBreath transmission is for a long time a communication difficult problem urgently to be resolved hurrily.
First, in existing micro-wave extension system, the circuit between unit etc. is all independently, connects each other with cableConnect, the volume that makes like this micro-wave extension system is large, complex structure, and reliability is low. Along with what communication system performance was requiredDay by day improve, to high-quality, high integrated, micro-wave extension system equipment demand modular, miniaturization is very urgent,This just need to integrate the each middle circuit of composition, meets miniaturization, integrated requirement, uses simple simultaneously.
Secondly, the ubiquitous problem of existing micro-wave extension system is exactly transmitting and the mutual interference problem receiving, and sends outThe received antenna of signal of penetrating receives again, will cause severe jamming to actual reception signal, general solution like this, in transmitting and between receiving, enough isolations are set. But in the time of the miniaturization of micro-wave extension system, this mutual interference problem also canBecome more serious.
Therefore, be necessary for the problems referred to above, redesign a kind of micro-wave extension system.
Summary of the invention
The object of the invention is to be achieved through the following technical solutions.
According to the embodiment of the present invention, propose a kind of digital microwave far-drawing system, described system comprises:
Hyperfrequency microwave transmitting and receiving unit, for microwave signal transmitting-receiving, works in ultra-high frequency band; And
Unit is eliminated in mutual interference, eliminates for the mutual interference of micro-wave extension system receiving and transmitting signal.
According to the embodiment of the present invention, described hyperfrequency Transmit-Receive Unit comprises: inphase quadrature modulator, transmitting power controlUnit, transmitting FH spectrum-spreading unit, crystal resonator, the first power divider, reception FH spectrum-spreading unit, image frequency suppress mixingDevice, intermediate frequency amplifier, the second power divider, the first switch, second switch, the first intermediate-frequency filter, the second intermediate frequency filteringDevice, the 3rd intermediate-frequency filter, the 3rd switch, the 4th switch, demodulator, power supply and monitoring means;
The external base-band input signal of first input end mouth of described inphase quadrature modulator, the 3rd output of inphase quadrature modulatorPort is connected with the first port of transmitting power control module, the second output port output radiofrequency signal of transmitting power control module;The first output port of crystal resonator is connected with the second input port of the first power divider; First of the first power dividerOutput port is connected with the second input port that receives FH spectrum-spreading unit, the 3rd output port and transmitting of the first power dividerThe first input end mouth of FH spectrum-spreading unit is connected; The of the second output port of transmitting FH spectrum-spreading unit and inphase quadrature modulatorTwo input ports are connected; The external radiofrequency signal of first input end mouth of image frequency rejection mixer, image frequency rejection mixer second defeatedInbound port is connected with the first output port that receives FH spectrum-spreading unit, and the 3rd output port and the intermediate frequency of image frequency rejection mixer are putThe second input port of large device is connected; The first output port of intermediate frequency amplifier is connected with the second port of the second power divider;The first output port of the second power divider is connected with the second input port of demodulator, the 3rd port of the second power dividerBe connected with the second port of the first switch; The second input port phase of the first output port of the first switch and the first intermediate-frequency filterConnect, the 3rd output port of the first switch is connected with the second input port of second switch; The first output port of second switch withThe second input port of the second intermediate-frequency filter is connected, the 3rd output port of second switch and the 3rd intermediate-frequency filter second defeatedInbound port is connected; The first output port of the first intermediate-frequency filter is connected with the second input port of the 4th switch; The second intermediate frequency filterThe first output port of ripple device is connected with the second input port of the 3rd switch; The first output port of the 3rd intermediate-frequency filter andThe 3rd input port of three switches is connected; The first output port of the 3rd switch is connected with the 3rd input port of the 4th switch; TheThe first output port output intermediate-freuqncy signal of four switches; The first output port of demodulator is connected with monitoring means; Inphase quadrature is adjustedThe baseband signal of input is directly modulated to the required rf frequency of transmission by device processed, sends into transmitting power control module, by transmitting meritRate control module is controlled at the amplitude of radiofrequency signal in the scope needing and exports; Image frequency rejection mixer is by penetrating from LNAFrequently signal carries out frequency conversion, and output intermediate-freuqncy signal, then carries out intermediate frequency amplification, the signal after amplification, and through power divider, oneDemodulator is sent on road, and export after intermediate frequency filtering on another road.
According to the embodiment of the present invention, described mutual interference is eliminated unit and is comprised:
Receiver module, for receive base station signal and the feedback signal that transmits and form after feedback channel, and by receiveTo described base station signal and described feedback signal be sent to digital baseband conversion module;
Digital baseband conversion module, joins with described receiver module and digital signal processing module respectively, for by described base stationSignal and described feedback signal carry out being converted to baseband signal after mixing, afterwards described baseband signal are exported to Digital Signal ProcessingModule;
Digital signal processing module, joins with described digital baseband conversion module, micro-signal generation module and composite module respectively,For two wave filters that are respectively first frequency and second frequency by intermediate frequency, described baseband signal is carried out to filtering, byBetween include described base station signal in the signal that forms after the frequency filter filtering that is first frequency, described second frequency is placeIn the frequency at the frequency spectrum cavity-pocket place of described base station signal; By the letter forming after the filter filtering that is first frequency by intermediate frequencyNumber be designated as the first tributary signal, the signal forming after the filter filtering that is second frequency by intermediate frequency is designated as to the second branch roadSignal; Described the second tributary signal is carried out to backward shift frequently to described first frequency place, and its amplitude is amplified to k doubly, k 10, shapeBecome signal to be offseted; Thereby described in deducting with described the first tributary signal after offseting signal to obtain feedback cancellation signal, will described inAfter feedback cancellation, signal is sent to respectively described micro-signal generation module and composite module;
Micro-signal generation module, joins with described digital signal processing module and composite module respectively, for receiving by describedSignal after the feedback cancellation of digital signal processing module output, and signal after described feedback cancellation is carried out to shift frequency to described the second frequencyRate place, then its amplitude is narrowed down to original 1/k doubly, obtain micro-signal, export described micro-signal to composite module afterwards;
Composite module, joins with described digital signal processing module, described micro-signal generation module respectively, described anti-for makingFeedback offsets rear signal and described micro-signal is added to obtain signal to be transmitted, and described signal to be transmitted is sent to transmitting power controlUnit processed.
According to the preferred embodiment of the present invention, described digital signal processing module comprises:
The first filtration module, joins with subtraction block, for the wave filter that is first frequency by intermediate frequency to described base bandSignal carries out filtering, in the signal forming, comprises described base station signal after filtering; By the filter that is first frequency by intermediate frequencyThe signal forming after the filtering of ripple device is designated as the first tributary signal, and described the first tributary signal is sent to subtraction block;
The second filtration module, joins with backward shift frequency module, for the wave filter that is second frequency by intermediate frequency to described baseBand signal carries out filtering, and described second frequency is the frequency at the frequency spectrum cavity-pocket place in described base station signal; To be by intermediate frequencyThe signal forming after the filter filtering of second frequency is designated as the second tributary signal, and described the second tributary signal is sent to insteadShift frequency module;
Backward shift frequency module, joins with described the second filtration module and amplification module respectively, for described the second tributary signal is enteredExtremely described first frequency place of row backward shift frequency, and the signal after backward shift is frequently sent to amplification module;
Amplification module, joins with described backward shift frequency module and subtraction block respectively, for the amplitude of the signal after backward shift is frequently putLarge k times, k > 10, to form signal to be offseted, described in inciting somebody to action afterwards, signal to be offseted is sent to subtraction block; And
Subtraction block, joins with described the first filtration module and described amplification module respectively, for making described the first tributary signalDescribed in deducting wait offseting signal with signal after obtaining feedback cancellation.
According to the preferred embodiment of the present invention, described micro-signal generation module comprises shift frequency module and falls a times module; DescribedShift frequency module is fallen a times module, institute for signal after described feedback cancellation being carried out to shift frequency to described second frequency place and described in exporting toState and fall times module for shift frequency to the amplitude of the signal at described second frequency place being contracted to the amplitude of signal after described feedback cancellation1/k times, thus micro-signal formed.
Digital microwave far-drawing system of the present invention is operated in hyper band, and radio wave diffraction ability is stronger, can be with less equipmentCost, meets the demand of remote beyond-the-horizon communication, can also guarantee the transmitting of information under over the horizon transmission variable-parameter channel;Digital microwave far-drawing system of the present invention can be realized feedback cancellation without channel is estimated, real under varying Channels conditionStrong by property.
Brief description of the drawings
By reading below detailed description of the preferred embodiment, various other advantage and benefit for ordinary skillIt is cheer and bright that personnel will become. Accompanying drawing is only for the object of preferred embodiment is shown, and do not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol. In the accompanying drawings:
Accompanying drawing 1 shows the digital microwave far-drawing system structural representation according to embodiment of the present invention;
Accompanying drawing 2 shows the hyperfrequency Transmit-Receive Unit structural representation according to embodiment of the present invention;
Accompanying drawing 3 shows according to the mutual interference of embodiment of the present invention and eliminates cellular construction schematic diagram;
Accompanying drawing 4 shows the digital signal processing module structural representation according to embodiment of the present invention.
Detailed description of the invention
Illustrative embodiments of the present disclosure is described below with reference to accompanying drawings in more detail. Although shown of the present disclosure in accompanying drawingIllustrative embodiments, but should be appreciated that and can realize the disclosure and the embodiment that should do not set forth here with various formsInstitute limits. On the contrary, it is in order more thoroughly to understand the disclosure that these embodiments are provided, and can be by model of the present disclosureEnclose the complete those skilled in the art that conveys to.
According to the embodiment of the present invention, propose a kind of digital microwave far-drawing system, as shown in Figure 1, described system comprises:
Hyperfrequency microwave transmitting and receiving unit, for microwave signal transmitting-receiving, works in ultra-high frequency band; And
Unit is eliminated in mutual interference, eliminates for the mutual interference of micro-wave extension system receiving and transmitting signal.
According to the specific embodiment of the present invention, as shown in Figure 2, described hyperfrequency Transmit-Receive Unit comprises: inphase quadrature is adjustedDevice processed, transmitting power control module, transmitting FH spectrum-spreading unit, crystal resonator, the first power divider, reception FH spread spectrumUnit, image frequency rejection mixer, intermediate frequency amplifier, the second power divider, the first switch, second switch, the first intermediate frequency filterRipple device, the second intermediate-frequency filter, the 3rd intermediate-frequency filter, the 3rd switch, the 4th switch, demodulator, power supply and monitoring means;
The external base-band input signal of first input end mouth of described inphase quadrature modulator, the 3rd output of inphase quadrature modulatorPort is connected with the first port of transmitting power control module, the second output port output radiofrequency signal of transmitting power control module;The first output port of crystal resonator is connected with the second input port of the first power divider; First of the first power dividerOutput port is connected with the second input port that receives FH spectrum-spreading unit, the 3rd output port and transmitting of the first power dividerThe first input end mouth of FH spectrum-spreading unit is connected; The of the second output port of transmitting FH spectrum-spreading unit and inphase quadrature modulatorTwo input ports are connected; The external radiofrequency signal of first input end mouth of image frequency rejection mixer, image frequency rejection mixer second defeatedInbound port is connected with the first output port that receives FH spectrum-spreading unit, and the 3rd output port and the intermediate frequency of image frequency rejection mixer are putThe second input port of large device is connected; The first output port of intermediate frequency amplifier is connected with the second port of the second power divider;The first output port of the second power divider is connected with the second input port of demodulator, the 3rd port of the second power dividerBe connected with the second port of the first switch; The second input port phase of the first output port of the first switch and the first intermediate-frequency filterConnect, the 3rd output port of the first switch is connected with the second input port of second switch; The first output port of second switch withThe second input port of the second intermediate-frequency filter is connected, the 3rd output port of second switch and the 3rd intermediate-frequency filter second defeatedInbound port is connected; The first output port of the first intermediate-frequency filter is connected with the second input port of the 4th switch; The second intermediate frequency filterThe first output port of ripple device is connected with the second input port of the 3rd switch; The first output port of the 3rd intermediate-frequency filter andThe 3rd input port of three switches is connected; The first output port of the 3rd switch is connected with the 3rd input port of the 4th switch; TheThe first output port output intermediate-freuqncy signal of four switches; The first output port of demodulator is connected with monitoring means; Inphase quadrature is adjustedThe baseband signal of input is directly modulated to the required rf frequency of transmission by device processed, sends into transmitting power control module, by transmitting meritRate control module is controlled at the amplitude of radiofrequency signal in the scope needing and exports; Image frequency rejection mixer is by penetrating from LNAFrequently signal carries out frequency conversion, and output intermediate-freuqncy signal, then carries out intermediate frequency amplification, the signal after amplification, and through power divider, oneDemodulator is sent on road, and export after intermediate frequency filtering on another road.
Described reception FH spectrum-spreading unit and described transmitting FH spectrum-spreading unit share the clock that a crystal resonator produces.
Described image frequency rejection mixer can be both passive, can be also active.
Described inphase quadrature modulator, transmitting power control module, transmitting FH spectrum-spreading unit, crystal resonator, the first meritRate distributor, receive FH spectrum-spreading unit, image frequency rejection mixer, intermediate frequency amplifier, the second power divider, the first switch,Second switch, the first intermediate-frequency filter, the second intermediate-frequency filter, the 3rd intermediate-frequency filter, the 3rd switch, the 4th switch, solutionAdjust device, power supply and monitoring means to be integrated in a printed board.
According to the specific embodiment of the present invention, as shown in Figure 3, described mutual interference is eliminated unit and is comprised:
Receiver module, for receive base station signal and the feedback signal that transmits and form after feedback channel, and by receiveTo described base station signal and described feedback signal be sent to digital baseband conversion module;
Digital baseband conversion module, joins with described receiver module and digital signal processing module respectively, for by described base stationSignal and described feedback signal carry out being converted to baseband signal after mixing, afterwards described baseband signal are exported to Digital Signal ProcessingModule;
Digital signal processing module, joins with described digital baseband conversion module, micro-signal generation module and composite module respectively,For two wave filters that are respectively first frequency and second frequency by intermediate frequency, described baseband signal is carried out to filtering, byBetween include described base station signal in the signal that forms after the frequency filter filtering that is first frequency, described second frequency is placeIn the frequency at the frequency spectrum cavity-pocket place of described base station signal; By the letter forming after the filter filtering that is first frequency by intermediate frequencyNumber be designated as the first tributary signal, the signal forming after the filter filtering that is second frequency by intermediate frequency is designated as to the second branch roadSignal; Described the second tributary signal is carried out to backward shift frequently to described first frequency place, and its amplitude is amplified to k doubly, k 10, shapeBecome signal to be offseted; Thereby described in deducting with described the first tributary signal after offseting signal to obtain feedback cancellation signal, will described inAfter feedback cancellation, signal is sent to respectively described micro-signal generation module and composite module;
Micro-signal generation module, joins with described digital signal processing module and composite module respectively, for receiving by described numberSignal after the feedback cancellation of word signal processing module output, and signal after described feedback cancellation is carried out to shift frequency to described second frequencyPlace, then its amplitude is narrowed down to original 1/k doubly, obtain micro-signal, export described micro-signal to composite module afterwards;
Composite module, joins with described digital signal processing module, described micro-signal generation module respectively, described anti-for makingFeedback offsets rear signal and described micro-signal is added to obtain signal to be transmitted, and described signal to be transmitted is sent to transmitting power controlUnit processed.
According to the preferred embodiment of the present invention, as shown in Figure 4, described digital signal processing module comprises:
The first filtration module, joins with subtraction block, for the wave filter that is first frequency by intermediate frequency to described base bandSignal carries out filtering, in the signal forming, comprises described base station signal after filtering; By the filter that is first frequency by intermediate frequencyThe signal forming after the filtering of ripple device is designated as the first tributary signal, and described the first tributary signal is sent to subtraction block;
The second filtration module, joins with backward shift frequency module, for the wave filter that is second frequency by intermediate frequency to described baseBand signal carries out filtering, and described second frequency is the frequency at the frequency spectrum cavity-pocket place in described base station signal; To be by intermediate frequencyThe signal forming after the filter filtering of second frequency is designated as the second tributary signal, and described the second tributary signal is sent to insteadShift frequency module;
Backward shift frequency module, joins with described the second filtration module and amplification module respectively, for described the second tributary signal is enteredExtremely described first frequency place of row backward shift frequency, and the signal after backward shift is frequently sent to amplification module;
Amplification module, joins with described backward shift frequency module and subtraction block respectively, for the amplitude of the signal after backward shift is frequently putLarge k times, k > 10, to form signal to be offseted, described in inciting somebody to action afterwards, signal to be offseted is sent to subtraction block; And
Subtraction block, joins with described the first filtration module and described amplification module respectively, for making described the first tributary signalDescribed in deducting wait offseting signal with signal after obtaining feedback cancellation.
According to the preferred embodiment of the present invention, described micro-signal generation module comprises shift frequency module and falls a times module; Described movingFrequency module falls a times module for signal after described feedback cancellation being carried out to shift frequency to described second frequency place and described in exporting to, described inTimes module is fallen for shift frequency to the amplitude of the signal at described second frequency place being contracted to the amplitude of signal after described feedback cancellation1/k times, thus micro-signal formed.
The method that unit by using shift frequency is eliminated in described mutual interference produces micro-signal, and adds micro-signal to base station transmit signalsFrequency spectrum cavity-pocket place, utilizes this micro-signal only to exist the frequency position feature different with amplitude to realize feedback cancellation, nothing with transmittingNeed estimate to realize feedback cancellation to channel, practical under varying Channels condition.
The above, be only preferably detailed description of the invention of the present invention, but protection scope of the present invention is not limited to this, appointsWhat is familiar with those skilled in the art in the technical scope of the present invention's exposure, and the variation that can expect easily or replacement, all answerWithin being encompassed in protection scope of the present invention. Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (3)
1. a digital microwave far-drawing system, described system comprises:
Hyperfrequency microwave transmitting and receiving unit, for microwave signal transmitting-receiving, works in ultra-high frequency band; And
Unit is eliminated in mutual interference, eliminates for the mutual interference of micro-wave extension system receiving and transmitting signal; Wherein,
Described hyperfrequency microwave transmitting and receiving unit comprises: inphase quadrature modulator, transmitting power control module, transmitting FH spectrum-spreading unit,Crystal resonator, the first power divider, reception FH spectrum-spreading unit, image frequency rejection mixer, intermediate frequency amplifier, the second meritRate distributor, the first switch, second switch, the first intermediate-frequency filter, the second intermediate-frequency filter, the 3rd intermediate-frequency filter,Three switches, the 4th switch, demodulator, power supply and monitoring means;
The external base-band input signal of first input end mouth of described inphase quadrature modulator, the 3rd output port of inphase quadrature modulator withThe first port of transmitting power control module connects, the second output port output radiofrequency signal of transmitting power control module; CrystalThe first output port of resonator is connected with the second input port of the first power divider; The first output of the first power dividerPort is connected with the second input port that receives FH spectrum-spreading unit, and the 3rd output port of the first power divider expands with transmitting FHFrequently the first input end mouth of unit is connected; The second output port of transmitting FH spectrum-spreading unit and inphase quadrature modulator second defeatedInbound port is connected; The external radiofrequency signal of first input end mouth of image frequency rejection mixer, the second input of image frequency rejection mixerMouth is connected with the first output port that receives FH spectrum-spreading unit, the 3rd output port and intermediate frequency amplifier of image frequency rejection mixerThe second input port be connected; The first output port of intermediate frequency amplifier is connected with the second port of the second power divider; SecondThe first output port of power divider is connected with the second input port of demodulator, the 3rd port of the second power divider andThe second port of one switch is connected; The first output port of the first switch is connected with the second input port of the first intermediate-frequency filter,The 3rd output port of the first switch is connected with the second input port of second switch; First output port and second of second switchThe second input port of intermediate-frequency filter is connected, the 3rd output port of second switch and the second input of the 3rd intermediate-frequency filterMouth is connected; The first output port of the first intermediate-frequency filter is connected with the second input port of the 4th switch; The second intermediate-frequency filterThe first output port be connected with the second input port of the 3rd switch; The first output port of the 3rd intermediate-frequency filter and the 3rd is openedThe 3rd input port closing is connected; The first output port of the 3rd switch is connected with the 3rd input port of the 4th switch; The 4th opensThe first output port output intermediate-freuqncy signal of closing; The first output port of demodulator is connected with monitoring means; Inphase quadrature modulatorThe baseband signal of input is directly modulated to the required rf frequency of transmission, sends into transmitting power control module, by transmitting power controlUnit processed is controlled at the amplitude of radiofrequency signal in the scope needing and exports; Image frequency rejection mixer is by from low-noise amplifierRadiofrequency signal is carried out frequency conversion, and output intermediate-freuqncy signal, then carries out intermediate frequency amplification, the signal after amplification, and through power divider,Demodulator is sent on one tunnel, and export after intermediate frequency filtering on another road; And
Described mutual interference is eliminated unit and is comprised:
Receiver module, for the feedback signal that receives base station signal and transmit and form after feedback channel, and by received instituteState base station signal and described feedback signal is sent to digital baseband conversion module;
Digital baseband conversion module, joins with described receiver module and digital signal processing module respectively, for by described base station signal andDescribed feedback signal carries out being converted to baseband signal after mixing, afterwards described baseband signal is exported to digital signal processing module;Digital signal processing module, joins with described digital baseband conversion module, micro-signal generation module and composite module respectively, forTwo wave filters that are respectively first frequency and second frequency by intermediate frequency carry out filtering to described baseband signal, by centre frequentlyRate is to include described base station signal in the signal forming after the filter filtering of first frequency, and described second frequency is in instituteState the frequency at the frequency spectrum cavity-pocket place of base station signal; The signal forming after the filter filtering that is first frequency by intermediate frequency is rememberedBe the first tributary signal, the signal forming after the filter filtering that is second frequency by intermediate frequency is designated as to the second tributary signal;Described the second tributary signal is carried out to backward shift frequently to described first frequency place, and its amplitude is amplified to k doubly, k 10, it is right that formation is treatedSignal disappears; Thereby described in deducting with described the first tributary signal after offseting signal to obtain feedback cancellation signal, by right described feedbackAfter disappearing, signal is sent to respectively described micro-signal generation module and composite module;
Micro-signal generation module, joins with described digital signal processing module and composite module respectively, for receiving by described data signalSignal after the feedback cancellation of processing module output, and signal after described feedback cancellation is carried out to shift frequency to described second frequency place, thenIts amplitude is narrowed down to original 1/k doubly, obtain micro-signal, export described micro-signal to composite module afterwards;
Composite module, joins with described digital signal processing module, described micro-signal generation module respectively, for making described feedback cancellationRear signal and described micro-signal are added to obtain signal to be transmitted, and described signal to be transmitted is sent to transmitting power control module.
2. a system as claimed in claim 1, described digital signal processing module comprises:
The first filtration module, joins with subtraction block, for the wave filter that is first frequency by intermediate frequency, described baseband signal is enteredRow filtering, comprises described base station signal in the signal forming after filtering; The wave filter that is first frequency by intermediate frequency is filteredThe signal forming after ripple is designated as the first tributary signal, and described the first tributary signal is sent to subtraction block;
The second filtration module, joins with backward shift frequency module, for the wave filter that is second frequency by intermediate frequency to described baseband signalCarry out filtering, described second frequency is the frequency at the frequency spectrum cavity-pocket place in described base station signal; To be the second frequency by intermediate frequencyThe signal forming after the filter filtering of rate is designated as the second tributary signal, and described the second tributary signal is sent to backward shift mould frequentlyPiece;
Backward shift frequency module, joins with described the second filtration module and amplification module respectively, for described the second tributary signal is carried out to backward shiftFrequently be sent to amplification module to described first frequency place, and by the signal after backward shift frequently;
Amplification module, joins with described backward shift frequency module and subtraction block respectively, for the amplitude of the signal after backward shift is frequently amplified to k doubly,K > 10, to form signal to be offseted, described in inciting somebody to action afterwards, signal to be offseted is sent to subtraction block; And
Subtraction block, joins with described the first filtration module and described amplification module respectively, for making described the first tributary signal deduct instituteState wait offseting signal with signal after obtaining feedback cancellation.
3. a system as claimed in claim 1, described micro-signal generation module comprises shift frequency module and falls a times module; Described shift frequencyModule for by signal after described feedback cancellation carry out shift frequency to described second frequency place and export to described in a times module is fallen, described in fallTimes module is for being contracted to shift frequency to the amplitude of the signal at described second frequency place the 1/k of the amplitude of signal after described feedback cancellationTimes, thereby form micro-signal.
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| US5752164A (en) * | 1992-04-27 | 1998-05-12 | American Pcs L.P. | Autonomous remote measurement unit for a personal communications service system |
| CN2831265Y (en) * | 2005-09-29 | 2006-10-25 | 中国电子科技集团公司第五十研究所 | Microwave module of roadside unit in electronic non-parking charging short-range communication system |
| US8619732B2 (en) * | 2008-02-28 | 2013-12-31 | Broadcom Corporation | Method and apparatus for enabling coexistence of plurality of communication technologies on communication device |
| CN201302722Y (en) * | 2008-12-01 | 2009-09-02 | 西安电子科技大学 | Ultrahigh frequency wireless radio frequency identification reader |
| CN201690606U (en) * | 2010-05-25 | 2010-12-29 | 京信通信系统（中国）有限公司 | Multi-split microwave remote system |
| US9112549B2 (en) * | 2012-10-05 | 2015-08-18 | Dali Systems Co. Ltd. | DAS integrated digital off-air repeater |
| CN102970260B (en) * | 2012-12-24 | 2016-05-04 | 京信通信系统（中国）有限公司 | Noise suppressing method, device and LTE digital microwave radio remote unit coverage system |
| CN202979007U (en) * | 2012-12-24 | 2013-06-05 | 京信通信系统（中国）有限公司 | LTE digital microwave remote radio head coverage system and uplink baseband processor |
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