CN104301003A - Digital microwave remote system - Google Patents
Digital microwave remote system Download PDFInfo
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- CN104301003A CN104301003A CN201410583554.9A CN201410583554A CN104301003A CN 104301003 A CN104301003 A CN 104301003A CN 201410583554 A CN201410583554 A CN 201410583554A CN 104301003 A CN104301003 A CN 104301003A
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Abstract
The invention relates to a digital microwave remote system. The digital microwave remote system works on an ultrahigh frequency band, is high in electric wave diffraction capacity, and can not only meet the long-distance BVR (beyond visual range) communication demand at a low equipment cost but also guarantee reliable information transmission under a BVR transmission variable-parameter channel. According to the digital microwave remote system, feedback compensation can be achieved without estimating the channel, and the practicability is high under a fast time-varying channel condition.
Description
Technical field
The present invention relates to field of microwave communication, particularly relate 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 satellite communication cannot use in a large number due to its cost intensive.The communication equipment of low cost, lightweight, using function versatile and flexible is more and more subject to attracting attention of people.Therefore, development of miniaturized, lightness, low cost lightweight equipment solve short-distance and medium-distance wireless information transfer, are communication difficult problems urgently to be resolved hurrily for a long time.
First, in existing micro-wave extension system, the circuit between unit etc. are all independently, connect each other with cable, and the volume making micro-wave extension system is like this comparatively large, complex structure, and reliability is low.Along with the raising day by day required communication system performance, very urgent to high-quality, high integrated, modular, miniaturized micro-wave extension system equipment demand, this just needs each for composition middle circuit to integrate, and meets miniaturized, integrated requirement, uses simple simultaneously.
Secondly, the ubiquitous problem of existing micro-wave extension system is exactly the mutual interference problem of launching and receiving, namely the signal launched is received antenna and again receives, will cause severe jamming to the Received signal strength of reality like this, general solution is between launching and receiving, arrange enough isolations.But when micro-wave extension system compact, this mutual interference problem also can become 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 transceiver unit, for microwave signal transmitting-receiving, works in ultra-high frequency band; And
Mutual interference cancellation unit, the mutual interference for micro-wave extension system receiving and transmitting signal is eliminated.
According to the embodiment of the present invention, described hyperfrequency Transmit-Receive Unit comprises: inphase quadrature modulator, transmitting power control unit, 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 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, 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 is connected with the first port of transmitting power control unit, and the second output port of transmitting power control unit exports radiofrequency signal; First output port of crystal resonator is connected with the second input port of the first power divider; First output port of the first power divider is connected with the second input port receiving FH spectrum-spreading unit, and the 3rd output port of the first power divider is connected with the first input end mouth launching FH spectrum-spreading unit; The second output port launching FH spectrum-spreading unit is connected with the second input port of inphase quadrature modulator; The external radiofrequency signal of first input end mouth of image frequency rejection mixer, second input port of image frequency rejection mixer is connected with the first output port receiving FH spectrum-spreading unit, and the 3rd output port of image frequency rejection mixer is connected with the second input port of intermediate frequency amplifier; First output port of intermediate frequency amplifier is connected with the second port of the second power divider; First output port of the second power divider is connected with the second input port of demodulator, and the 3rd port of the second power divider is connected with the second port of the first switch; First output port of the first switch is connected with the second input port of the first intermediate-frequency filter, and the 3rd output port of the first switch is connected with the second input port of second switch; First output port of second switch is connected with the second input port of the second intermediate-frequency filter, and the 3rd output port of second switch is connected with the second input port of the 3rd intermediate-frequency filter; First output port of the first intermediate-frequency filter is connected with the second input port of the 4th switch; First output port of the second intermediate-frequency filter is connected with the second input port of the 3rd switch; First output port of the 3rd intermediate-frequency filter is connected with the 3rd input port of the 3rd switch; First output port of the 3rd switch is connected with the 3rd input port of the 4th switch; First output port of the 4th switch exports intermediate-freuqncy signal; Input first output port of demodulator is connected with monitoring means; Electric power output voltage V inphase quadrature modulator, by the rf frequency needed for the baseband signal directly modulation of input to transmission, sends into transmitting power control unit, the amplitude of radiofrequency signal is controlled to export in the scope needed by transmitting power control unit; Radiofrequency signal from LNA is carried out frequency conversion by image frequency rejection mixer, exports intermediate-freuqncy signal, then carries out intermediate frequency amplification, the signal after amplification, and through power divider, demodulator is sent on a road, and another road exports after intermediate frequency filtering.
According to the embodiment of the present invention, described mutual interference cancellation unit comprises:
Receiver module, for receiving base station signal and the feedback signal formed after feedback channel that transmits, and is sent to digital baseband conversion module by received described base station signal and described feedback signal;
Digital baseband conversion module, connects with described receiver module and digital signal processing module respectively, is converted to baseband signal, afterwards described baseband signal is exported to digital signal processing module after described base station signal and described feedback signal are carried out mixing;
Digital signal processing module, connect with described digital baseband conversion module, micro-signal generation module and composite module respectively, two filters for being respectively first frequency and second frequency by intermediate frequency carry out filtering to described baseband signal, include described base station signal in the signal formed after being the filter filtering of first frequency by intermediate frequency, described second frequency is the frequency at the frequency spectrum cavity-pocket place being in described base station signal; The signal formed after being the filter filtering of first frequency by intermediate frequency is designated as the first tributary signal, the signal formed after being the filter filtering of second frequency by intermediate frequency is designated as the second tributary signal; Described second tributary signal is carried out backward shift frequently to described first frequency place, and its amplitude is amplified k doubly, k>10, forms signal to be offseted; Described in deducting with described first tributary signal after offseting signal thus obtain feedback cancellation signal, signal after described feedback cancellation is sent to described micro-signal generation module and composite module respectively;
Micro-signal generation module, connect with described digital signal processing module and composite module respectively, for receiving signal after the feedback cancellation that exported by described digital signal processing module, and signal after described feedback cancellation is carried out shift frequency to described second frequency place, again its amplitude is narrowed down to original 1/k doubly, obtain micro-signal, export described micro-signal to composite module afterwards;
Composite module, connect with described digital signal processing module, described micro-signal generation module and Digital Up Convert module respectively, be added to obtain signal to be transmitted for signal after making described feedback cancellation and described micro-signal, and described signal to be transmitted is sent to transmitting power control unit.
According to the preferred embodiment of the present invention, described digital signal processing module comprises:
First filtration module, connects with subtraction block, for being that the filter of first frequency carries out filtering to described baseband signal by intermediate frequency, comprises described base station signal in the signal formed after filtering; The signal formed after being the filter filtering of first frequency by intermediate frequency is designated as the first tributary signal, and described first tributary signal is sent to subtraction block;
Second filtration module, connects with backward shift frequency module, and for being that the filter of second frequency carries out filtering to described baseband signal by intermediate frequency, described second frequency is the frequency at the frequency spectrum cavity-pocket place being in described base station signal; The signal formed after being the filter filtering of second frequency by intermediate frequency is designated as the second tributary signal, and described second tributary signal is sent to backward shift frequency module;
Backward shift frequency module, connects with described second filtration module and amplification module respectively, for described second tributary signal being carried out backward shift frequently to described first frequency place, and the signal after backward shift is frequently sent to amplification module;
Amplification module, connects with described backward shift frequency module and subtraction block respectively, and for the amplitude of the signal after backward shift is frequently amplified k doubly, k>10, to form signal to be offseted, is sent to subtraction block by signal described to be offseted afterwards; And
Subtraction block, connects with described first filtration module and described amplification module respectively, for make described first tributary signal deduct described in wait offseting signal to obtain signal after 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 shift frequency module is used for signal after described feedback cancellation to carry out shift frequency to described second frequency place and falls a times module described in exporting to, described times module of falling for shift frequency to the amplitude of signal at described second frequency place being contracted to the 1/k of the amplitude of signal after described feedback cancellation doubly, thus forms micro-signal.
Digital microwave far-drawing system of the present invention is operated in hyper band, and radio wave diffraction ability is comparatively strong, with less equipment cost, can 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 realize feedback cancellation without the need to carrying out estimation to channel, practical under varying Channels condition.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Figure 1 show the digital microwave far-drawing system structural representation according to embodiment of the present invention;
Figure 2 illustrate the hyperfrequency Transmit-Receive Unit structural representation according to embodiment of the present invention;
Figure 3 show the mutual interference cancellation unit structural representation according to embodiment of the present invention;
Fig. 4 illustrate the digital signal processing module structural representation according to embodiment of the present invention.
Embodiment
Below with reference to accompanying drawings illustrative embodiments of the present disclosure is described in more detail.Although show illustrative embodiments of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the execution mode of setting forth here.On the contrary, provide these execution modes to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
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 transceiver unit, for microwave signal transmitting-receiving, works in ultra-high frequency band; And
Mutual interference cancellation unit, the mutual interference for micro-wave extension system receiving and transmitting signal is eliminated.
According to the specific embodiment of the present invention, as shown in Figure 2, described hyperfrequency Transmit-Receive Unit comprises: inphase quadrature modulator, transmitting power control unit, 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 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, 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 is connected with the first port of transmitting power control unit, and the second output port of transmitting power control unit exports radiofrequency signal; First output port of crystal resonator is connected with the second input port of the first power divider; First output port of the first power divider is connected with the second input port receiving FH spectrum-spreading unit, and the 3rd output port of the first power divider is connected with the first input end mouth launching FH spectrum-spreading unit; The second output port launching FH spectrum-spreading unit is connected with the second input port of inphase quadrature modulator; The external radiofrequency signal of first input end mouth of image frequency rejection mixer, second input port of image frequency rejection mixer is connected with the first output port receiving FH spectrum-spreading unit, and the 3rd output port of image frequency rejection mixer is connected with the second input port of intermediate frequency amplifier; First output port of intermediate frequency amplifier is connected with the second port of the second power divider; First output port of the second power divider is connected with the second input port of demodulator, and the 3rd port of the second power divider is connected with the second port of the first switch; First output port of the first switch is connected with the second input port of the first intermediate-frequency filter, and the 3rd output port of the first switch is connected with the second input port of second switch; First output port of second switch is connected with the second input port of the second intermediate-frequency filter, and the 3rd output port of second switch is connected with the second input port of the 3rd intermediate-frequency filter; First output port of the first intermediate-frequency filter is connected with the second input port of the 4th switch; First output port of the second intermediate-frequency filter is connected with the second input port of the 3rd switch; First output port of the 3rd intermediate-frequency filter is connected with the 3rd input port of the 3rd switch; First output port of the 3rd switch is connected with the 3rd input port of the 4th switch; First output port of the 4th switch exports intermediate-freuqncy signal; Input first output port of demodulator is connected with monitoring means; Electric power output voltage V inphase quadrature modulator, by the rf frequency needed for the baseband signal directly modulation of input to transmission, sends into transmitting power control unit, the amplitude of radiofrequency signal is controlled to export in the scope needed by transmitting power control unit; Radiofrequency signal from LNA is carried out frequency conversion by image frequency rejection mixer, exports intermediate-freuqncy signal, then carries out intermediate frequency amplification, the signal after amplification, and through power divider, demodulator is sent on a road, and another road exports after intermediate frequency filtering.
Described reception FH spectrum-spreading unit and the described FH of transmitting spectrum-spreading unit share the clock that a crystal resonator produces.
Described image frequency rejection mixer both can be passive, also can be active.
Described inphase quadrature modulator, transmitting power control unit, 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 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, demodulator, power supply and monitoring means are integrated in one piece of printed board.
According to the specific embodiment of the present invention, as shown in Figure 3, described mutual interference cancellation unit comprises:
Receiver module, for receiving base station signal and the feedback signal formed after feedback channel that transmits, and is sent to digital baseband conversion module by received described base station signal and described feedback signal;
Digital baseband conversion module, connects with described receiver module and digital signal processing module respectively, is converted to baseband signal, afterwards described baseband signal is exported to digital signal processing module after described base station signal and described feedback signal are carried out mixing;
Digital signal processing module, connect with described digital baseband conversion module, micro-signal generation module and composite module respectively, two filters for being respectively first frequency and second frequency by intermediate frequency carry out filtering to described baseband signal, include described base station signal in the signal formed after being the filter filtering of first frequency by intermediate frequency, described second frequency is the frequency at the frequency spectrum cavity-pocket place being in described base station signal; The signal formed after being the filter filtering of first frequency by intermediate frequency is designated as the first tributary signal, the signal formed after being the filter filtering of second frequency by intermediate frequency is designated as the second tributary signal; Described second tributary signal is carried out backward shift frequently to described first frequency place, and its amplitude is amplified k doubly, k>10, forms signal to be offseted; Described in deducting with described first tributary signal after offseting signal thus obtain feedback cancellation signal, signal after described feedback cancellation is sent to described micro-signal generation module and composite module respectively;
Micro-signal generation module, connect with described digital signal processing module and composite module respectively, for receiving signal after the feedback cancellation that exported by described digital signal processing module, and signal after described feedback cancellation is carried out shift frequency to described second frequency place, again its amplitude is narrowed down to original 1/k doubly, obtain micro-signal, export described micro-signal to composite module afterwards;
Composite module, connect with described digital signal processing module, described micro-signal generation module and Digital Up Convert module respectively, be added to obtain signal to be transmitted for signal after making described feedback cancellation and described micro-signal, and described signal to be transmitted is sent to transmitting power control unit.
According to the preferred embodiment of the present invention, as shown in Figure 4, described digital signal processing module comprises:
First filtration module, connects with subtraction block, for being that the filter of first frequency carries out filtering to described baseband signal by intermediate frequency, comprises described base station signal in the signal formed after filtering; The signal formed after being the filter filtering of first frequency by intermediate frequency is designated as the first tributary signal, and described first tributary signal is sent to subtraction block;
Second filtration module, connects with backward shift frequency module, and for being that the filter of second frequency carries out filtering to described baseband signal by intermediate frequency, described second frequency is the frequency at the frequency spectrum cavity-pocket place being in described base station signal; The signal formed after being the filter filtering of second frequency by intermediate frequency is designated as the second tributary signal, and described second tributary signal is sent to backward shift frequency module;
Backward shift frequency module, connects with described second filtration module and amplification module respectively, for described second tributary signal being carried out backward shift frequently to described first frequency place, and the signal after backward shift is frequently sent to amplification module;
Amplification module, connects with described backward shift frequency module and subtraction block respectively, and for the amplitude of the signal after backward shift is frequently amplified k doubly, k>10, to form signal to be offseted, is sent to subtraction block by signal described to be offseted afterwards; And
Subtraction block, connects with described first filtration module and described amplification module respectively, for make described first tributary signal deduct described in wait offseting signal to obtain signal after 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 shift frequency module is used for signal after described feedback cancellation to carry out shift frequency to described second frequency place and falls a times module described in exporting to, described times module of falling for shift frequency to the amplitude of signal at described second frequency place being contracted to the 1/k of the amplitude of signal after described feedback cancellation doubly, thus forms micro-signal.
Described mutual interference cancellation unit utilizes the method for shift frequency to produce micro-signal, and micro-signal is added to the frequency spectrum cavity-pocket place of base station transmit signals, this micro-signal is utilized to realize feedback cancellation with the feature that only there is frequency position different with amplitude that transmits, can feedback cancellation be realized without the need to carrying out estimation to channel, practical under varying Channels condition.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (5)
1. a digital microwave far-drawing system, described system comprises:
Hyperfrequency Microwave transceiver unit, for microwave signal transmitting-receiving, works in ultra-high frequency band; And
Mutual interference cancellation unit, the mutual interference for micro-wave extension system receiving and transmitting signal is eliminated.
2. a system as claimed in claim 1, described hyperfrequency Transmit-Receive Unit comprises: inphase quadrature modulator, transmitting power control unit, 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 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, 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 is connected with the first port of transmitting power control unit, and the second output port of transmitting power control unit exports radiofrequency signal; First output port of crystal resonator is connected with the second input port of the first power divider; First output port of the first power divider is connected with the second input port receiving FH spectrum-spreading unit, and the 3rd output port of the first power divider is connected with the first input end mouth launching FH spectrum-spreading unit; The second output port launching FH spectrum-spreading unit is connected with the second input port of inphase quadrature modulator; The external radiofrequency signal of first input end mouth of image frequency rejection mixer, second input port of image frequency rejection mixer is connected with the first output port receiving FH spectrum-spreading unit, and the 3rd output port of image frequency rejection mixer is connected with the second input port of intermediate frequency amplifier; First output port of intermediate frequency amplifier is connected with the second port of the second power divider; First output port of the second power divider is connected with the second input port of demodulator, and the 3rd port of the second power divider is connected with the second port of the first switch; First output port of the first switch is connected with the second input port of the first intermediate-frequency filter, and the 3rd output port of the first switch is connected with the second input port of second switch; First output port of second switch is connected with the second input port of the second intermediate-frequency filter, and the 3rd output port of second switch is connected with the second input port of the 3rd intermediate-frequency filter; First output port of the first intermediate-frequency filter is connected with the second input port of the 4th switch; First output port of the second intermediate-frequency filter is connected with the second input port of the 3rd switch; First output port of the 3rd intermediate-frequency filter is connected with the 3rd input port of the 3rd switch; First output port of the 3rd switch is connected with the 3rd input port of the 4th switch; First output port of the 4th switch exports intermediate-freuqncy signal; Input first output port of demodulator is connected with monitoring means; Electric power output voltage V inphase quadrature modulator, by the rf frequency needed for the baseband signal directly modulation of input to transmission, sends into transmitting power control unit, the amplitude of radiofrequency signal is controlled to export in the scope needed by transmitting power control unit; Radiofrequency signal from LNA is carried out frequency conversion by image frequency rejection mixer, exports intermediate-freuqncy signal, then carries out intermediate frequency amplification, the signal after amplification, and through power divider, demodulator is sent on a road, and another road exports after intermediate frequency filtering.
3. a system as claimed in claim 1, described mutual interference cancellation unit comprises:
Receiver module, for receiving base station signal and the feedback signal formed after feedback channel that transmits, and is sent to digital baseband conversion module by received described base station signal and described feedback signal;
Digital baseband conversion module, connects with described receiver module and digital signal processing module respectively, is converted to baseband signal, afterwards described baseband signal is exported to digital signal processing module after described base station signal and described feedback signal are carried out mixing;
Digital signal processing module, connect with described digital baseband conversion module, micro-signal generation module and composite module respectively, two filters for being respectively first frequency and second frequency by intermediate frequency carry out filtering to described baseband signal, include described base station signal in the signal formed after being the filter filtering of first frequency by intermediate frequency, described second frequency is the frequency at the frequency spectrum cavity-pocket place being in described base station signal; The signal formed after being the filter filtering of first frequency by intermediate frequency is designated as the first tributary signal, the signal formed after being the filter filtering of second frequency by intermediate frequency is designated as the second tributary signal; Described second tributary signal is carried out backward shift frequently to described first frequency place, and its amplitude is amplified k doubly, k>10, forms signal to be offseted; Described in deducting with described first tributary signal after offseting signal thus obtain feedback cancellation signal, signal after described feedback cancellation is sent to described micro-signal generation module and composite module respectively;
Micro-signal generation module, connect with described digital signal processing module and composite module respectively, for receiving signal after the feedback cancellation that exported by described digital signal processing module, and signal after described feedback cancellation is carried out shift frequency to described second frequency place, again its amplitude is narrowed down to original 1/k doubly, obtain micro-signal, export described micro-signal to composite module afterwards;
Composite module, connect with described digital signal processing module, described micro-signal generation module and Digital Up Convert module respectively, be added to obtain signal to be transmitted for signal after making described feedback cancellation and described micro-signal, and described signal to be transmitted is sent to transmitting power control unit.
4. a system as claimed in claim 3, described digital signal processing module comprises:
First filtration module, connects with subtraction block, for being that the filter of first frequency carries out filtering to described baseband signal by intermediate frequency, comprises described base station signal in the signal formed after filtering; The signal formed after being the filter filtering of first frequency by intermediate frequency is designated as the first tributary signal, and described first tributary signal is sent to subtraction block;
Second filtration module, connects with backward shift frequency module, and for being that the filter of second frequency carries out filtering to described baseband signal by intermediate frequency, described second frequency is the frequency at the frequency spectrum cavity-pocket place being in described base station signal; The signal formed after being the filter filtering of second frequency by intermediate frequency is designated as the second tributary signal, and described second tributary signal is sent to backward shift frequency module;
Backward shift frequency module, connects with described second filtration module and amplification module respectively, for described second tributary signal being carried out backward shift frequently to described first frequency place, and the signal after backward shift is frequently sent to amplification module;
Amplification module, connects with described backward shift frequency module and subtraction block respectively, and for the amplitude of the signal after backward shift is frequently amplified k doubly, k>10, to form signal to be offseted, is sent to subtraction block by signal described to be offseted afterwards; And
Subtraction block, connects with described first filtration module and described amplification module respectively, for make described first tributary signal deduct described in wait offseting signal to obtain signal after feedback cancellation.
5. a system as claimed in claim 3, described micro-signal generation module comprises shift frequency module and falls a times module; Described shift frequency module is used for signal after described feedback cancellation to carry out shift frequency to described second frequency place and falls a times module described in exporting to, described times module of falling for shift frequency to the amplitude of signal at described second frequency place being contracted to the 1/k of the amplitude of signal after described feedback cancellation doubly, thus forms micro-signal.
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