CN104301266B - A kind of microwave radio remote covering system - Google Patents
A kind of microwave radio remote covering system Download PDFInfo
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- CN104301266B CN104301266B CN201410583510.6A CN201410583510A CN104301266B CN 104301266 B CN104301266 B CN 104301266B CN 201410583510 A CN201410583510 A CN 201410583510A CN 104301266 B CN104301266 B CN 104301266B
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Abstract
The microwave radio remote covering system of the present invention is operated in hyper band, and radio wave diffraction ability is stronger, can meet the demand of remote beyond-the-horizon communication with less equipment cost, additionally it is possible to ensure the transmitting of the information in the case where over the horizon transmits variable-parameter channel；The microwave radio remote covering system of the present invention is practical under the conditions of varying Channels without being estimated channel feedback cancellation can be achieved；By setting microwave transmitting and receiving intelligent protection unit, the effect of adjustment and protection microwave power control equipment can be functioned well as.
Description
Technical field
The present invention relates to field of microwave communication, more particularly to a kind of microwave radio remote covering system.
Background technology
At present, there is communication dead zone in the influence of short-wave communication ionosphere, and station telecommunication distance is usually no more than 30km, and defends
Star communication can not be used largely because its is costly.Low cost, lightweight, use function versatile and flexible communication equipment it is more next
More attracted attention by people.Therefore, exploitation miniaturization, lightness, inexpensive lightweight equipment solve short-distance and medium-distance wireless communication
Breath transmission, is communication problem urgently to be resolved hurrily for a long time.
First, in existing microwave radio remote covering system, circuit between unit etc. be all it is independent, mutually it
Between use cable connection, so that the volume of microwave radio remote covering system is larger, complicated, and reliability is low.With right
The increasingly raising of communication system performance requirement, zooms out to high-quality, highly integrated, modular, miniaturization microwave radio and covers
Convering system device requirement is very urgent, and this, which is accomplished by that each middle circuit will be constituted, integrates, and meets miniaturization, integrated
It is required that, while using simple.
Secondly, a problem of existing microwave radio remote covering system generally existing is exactly to launch mutually dry with reception
Problem is disturbed, that is, the signal launched is received again by reception antenna, can thus cause severe jamming, one to actual reception signal
As solution be that enough isolations are set between transmitting and reception.But when microwave radio remote covering system is small-sized
During change, the mutual interference problem can also become more serious.
Finally, it is general in microwave radio remote covering system that microwave power control device can be all set, and microwave power control
Device processed is only amplified to input signal, and output signal can change with the change of input signal, and this is accomplished by well
The problem of solution output power and output loading are matched.In the case of load is unmatched, the signal of output can be reflexed to
On microwave power control device.Reflection can decline the microwave power control device life-span for a long time, in some instances it may even be possible to damage microwave work(
Rate control device.
The content of the invention
The purpose of the present invention is achieved through the following technical solutions.
According to the embodiment of the present invention, a kind of microwave radio remote covering system is proposed, the system includes：
Hyperfrequency microwave transceiver uni, for microwave signal transmitting-receiving, works in ultra-high frequency band；
Mutual interference cancellation unit, the mutual interference for microwave radio remote covering system receiving and transmitting signal is eliminated, and
Microwave transmitting and receiving intelligent protection unit, the intelligent protection for microwave radio remote covering system output control device；
It is characterized in that：
The mutual interference cancellation unit includes：
Receiving module, for receiving the feedback signal that base station signal and transmission signal are formed after feedback channel, and by institute
The base station signal and the feedback signal received is sent to digital baseband conversion module；
Digital baseband conversion module, connects with the receiving module and digital signal processing module respectively, for by described in
Base station signal and the feedback signal are converted to baseband signal after being mixed, and the baseband signal is exported give numeral letter afterwards
Number processing module；
Digital signal processing module, respectively with the digital baseband conversion module, micro-signal generation module and composite module
Connect, for being filtered by two wave filters that intermediate frequency is respectively first frequency and second frequency to the baseband signal
Ripple, by intermediate frequency to include the base station signal in the signal that is formed after the filter filtering of first frequency, described the
Two frequencies are the frequency at the frequency spectrum cavity-pocket in the base station signal；By by filter filtering of the intermediate frequency for first frequency
The signal formed afterwards is designated as tie point signal, by the letter by intermediate frequency to be formed after the filter filtering of second frequency
Number it is designated as the second tributary signal；Second tributary signal is carried out at backward shift frequency to the first frequency, and its amplitude is put
It is big k times, k>10, form signal to be offseted；The signal to be offseted is subtracted with the tie point signal to obtain feedback pair
Signal after disappearing, the micro-signal generation module and composite module are respectively sent to by signal after the feedback cancellation；
Micro-signal generation module, connects with the digital signal processing module and composite module respectively, for receiving by institute
Signal after the feedback cancellation of digital signal processing module output is stated, and signal after the feedback cancellation is subjected to shift frequency to described the
At two frequencies, then its amplitude narrowed down into original 1/k times, obtain WeChat ID, afterwards export the WeChat ID to combination die
Block；
Composite module, respectively with the digital signal processing module, the micro-signal generation module and Digital Up Convert mould
Block connects, for making signal after the feedback cancellation be added with the WeChat ID to obtain signal to be transmitted, and will be described pending
Signal is penetrated to send to transmitting power control unit.
According to the embodiment of the present invention, the microwave transmitting and receiving intelligent protection unit includes：Microprocessor, input work
Rate monitor, current monitor, temperature monitoring, VSWR monitor, output power monitor, automatic gain controller and grid
Pole tension controller；
The input power monitor connects microprocessor, current monitor connection microprocessor, the microprocessor other end
Automatic gain controller, grid voltage controller, output power monitor, VSWR monitor and temperature monitoring, grid are connect respectively
Another termination output power monitor of pole tension controller.
According to the embodiment of the present invention, the hyperfrequency Transmit-Receive Unit includes：Quadrature quadrature modulator, transmission power control
Unit processed, transmitting FH spectrum-spreading unit, crystal resonator, the first power divider, reception FH spectrum-spreading units, image frequency suppress mixing
Device, intermediate frequency amplifier, the second power divider, first switch, second switch, the first intermediate-frequency filter, the second intermediate-frequency filter,
3rd intermediate-frequency filter, the 3rd switch, the 4th switch, demodulator, power supply and monitoring unit；
The external base-band input signal of first input port of the quadrature quadrature modulator, the 3rd of quadrature quadrature modulator the
The first port connection of output port and transmitting power control unit, the second output port output of transmitting power control unit is penetrated
Frequency signal；First output port of crystal resonator is connected with the second input port of the first power divider；First power point
First output port of orchestration is connected with receiving the second input port of FH spectrum-spreading units, the 3rd output of the first power divider
Port is connected with the first input port of transmitting FH spectrum-spreading unit；The second output port and inphase quadrature of transmitting FH spectrum-spreading unit
Second input port of modulator is connected；The external radiofrequency signal of first input port of image frequency rejection mixer, image frequency suppresses mixed
Second input port of frequency device is connected with receiving the first output port of FH spectrum-spreading units, the 3rd output of image frequency rejection mixer
Port is connected with the second input port of intermediate frequency amplifier；First output port of intermediate frequency amplifier and the second power divider
Second port is connected；First output port of the second power divider is connected with the second input port of demodulator, the second power
3rd port of distributor is connected with the second port of first switch；The first output port and the first intermediate frequency filtering of first switch
Second input port of device is connected, and the 3rd output port of first switch is connected with the second input port of second switch；Second
Switch the first output port be connected with the second input port of the second intermediate-frequency filter, the 3rd output port of second switch and
Second input port of the 3rd intermediate-frequency filter is connected；The second of first output port of the first intermediate-frequency filter and the 4th switch
Input port is connected；First output port of the second intermediate-frequency filter is connected with the second input port of the 3rd switch；In 3rd
First output port of frequency wave filter is connected with the 3rd input port of the 3rd switch；The first output port and the of 3rd switch
3rd input port of four switches is connected；The first output port output intermediate-freuqncy signal of 4th switch；The input first of demodulator
Output port is connected with monitoring unit；The baseband signal of input is directly modulated to by electric power output voltage V quadrature quadrature modulators
Rf frequency needed for transmission, sends into transmitting power control unit, by transmitting power control unit by the amplitude control of radiofrequency signal
System is exported in the range of needs；Radiofrequency signal from LNA is carried out frequency conversion, output intermediate frequency letter by image frequency rejection mixer
Number, intermediate frequency amplification is then carried out, the signal after amplification by power divider, sends into demodulator, intermediate frequency is passed through on another road all the way
Exported after filtering.
According to the preferred embodiment of the present invention, the digital signal processing module includes：
First filtration module, connects with subtraction block, for by intermediate frequency for first frequency wave filter to described
Baseband signal is filtered, and the base station signal is included in the signal formed after filtering；To be the first frequency by intermediate frequency
The signal formed after the filter filtering of rate is designated as tie point signal, and the tie point signal is sent to subtraction mould
Block；
Second filtration module, connects with inverse frequency shift module, for by intermediate frequency for second frequency wave filter to institute
State baseband signal to be filtered, the second frequency is the frequency at the frequency spectrum cavity-pocket in the base station signal；Will be by centre
Frequency is designated as the second tributary signal for the signal that is formed after the filter filtering of second frequency, and by second tributary signal
Send to inverse frequency shift module；
Inverse frequency shift module, connects with second filtration module and amplification module respectively, for second branch road to be believed
Backward shift frequency number is carried out at the first frequency, and the signal after backward shift frequency is sent to amplification module；
Amplification module, connects with the inverse frequency shift module and subtraction block respectively, for by the width of the signal after backward shift frequency
K times of degree amplification, k>10, to form signal to be offseted, the signal to be offseted is sent to subtraction block afterwards；And
Subtraction block, connects with first filtration module and the amplification module, for making the tie point respectively
Signal subtract it is described wait offseting signal with signal after obtaining feedback cancellation.
According to the preferred embodiment of the present invention, the micro-signal generation module includes shift frequency module and drop times module；Institute
Stating shift frequency module is used to carry out at shift frequency to the second frequency signal after the feedback cancellation and export to the drop times mould
Block, the drop times module is used to the amplitude of the signal at shift frequency to the second frequency being contracted to signal after the feedback cancellation
1/k times of amplitude, so as to form WeChat ID.
The present invention microwave radio remote covering system be operated in hyper band, radio wave diffraction ability is stronger, can with compared with
Small equipment cost, meets the demand of remote beyond-the-horizon communication, additionally it is possible to ensure the information under over the horizon transmission variable-parameter channel
Transmitting；The microwave radio remote covering system of the present invention without being estimated channel feedback cancellation can be achieved,
It is practical under the conditions of varying Channels；By setting microwave transmitting and receiving intelligent protection unit, adjustment can be functioned well as
With the effect of protection microwave power control equipment.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Accompanying drawing 1 is shown zooms out covering according to the portable intelligent microwave radio based on hyperfrequency of embodiment of the present invention
System structure diagram；
Accompanying drawing 2 shows the hyperfrequency Transmit-Receive Unit structural representation according to embodiment of the present invention；
Accompanying drawing 3 shows the mutual interference cancellation unit structural representation according to embodiment of the present invention；
Accompanying drawing 4 shows the digital signal processing module structural representation according to embodiment of the present invention；
Accompanying drawing 5 shows the microwave transmitting and receiving intelligent protection unit structural representation according to embodiment of the present invention.
Embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in accompanying drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.Conversely it is able to be best understood from the disclosure there is provided these embodiments, and can be by this public affairs
The scope opened completely convey to those skilled in the art.
According to the embodiment of the present invention, a kind of microwave radio remote covering system, as shown in Figure 1, the system are proposed
System includes：
Hyperfrequency microwave transceiver uni, for microwave signal transmitting-receiving, works in ultra-high frequency band；
Mutual interference cancellation unit, the mutual interference for microwave radio remote covering system receiving and transmitting signal is eliminated, and
Microwave transmitting and receiving intelligent protection unit, the intelligent protection for microwave radio remote covering system output control device.
According to the embodiment of the present invention, as shown in Figure 2, the hyperfrequency Transmit-Receive Unit includes：Inphase quadrature
Modulator, transmitting power control unit, transmitting FH spectrum-spreading unit, crystal resonator, the first power divider, reception FH spread spectrums are single
Member, image frequency rejection mixer, intermediate frequency amplifier, the second power divider, first switch, second switch, the first intermediate-frequency filter,
Second intermediate-frequency filter, the 3rd intermediate-frequency filter, the 3rd switch, the 4th switch, demodulator, power supply and monitoring unit；
The external base-band input signal of first input port of the quadrature quadrature modulator, the 3rd of quadrature quadrature modulator the
The first port connection of output port and transmitting power control unit, the second output port output of transmitting power control unit is penetrated
Frequency signal；First output port of crystal resonator is connected with the second input port of the first power divider；First power point
First output port of orchestration is connected with receiving the second input port of FH spectrum-spreading units, the 3rd output of the first power divider
Port is connected with the first input port of transmitting FH spectrum-spreading unit；The second output port and inphase quadrature of transmitting FH spectrum-spreading unit
Second input port of modulator is connected；The external radiofrequency signal of first input port of image frequency rejection mixer, image frequency suppresses mixed
Second input port of frequency device is connected with receiving the first output port of FH spectrum-spreading units, the 3rd output of image frequency rejection mixer
Port is connected with the second input port of intermediate frequency amplifier；First output port of intermediate frequency amplifier and the second power divider
Second port is connected；First output port of the second power divider is connected with the second input port of demodulator, the second power
3rd port of distributor is connected with the second port of first switch；The first output port and the first intermediate frequency filtering of first switch
Second input port of device is connected, and the 3rd output port of first switch is connected with the second input port of second switch；Second
Switch the first output port be connected with the second input port of the second intermediate-frequency filter, the 3rd output port of second switch and
Second input port of the 3rd intermediate-frequency filter is connected；The second of first output port of the first intermediate-frequency filter and the 4th switch
Input port is connected；First output port of the second intermediate-frequency filter is connected with the second input port of the 3rd switch；In 3rd
First output port of frequency wave filter is connected with the 3rd input port of the 3rd switch；The first output port and the of 3rd switch
3rd input port of four switches is connected；The first output port output intermediate-freuqncy signal of 4th switch；The input first of demodulator
Output port is connected with monitoring unit；The baseband signal of input is directly modulated to by electric power output voltage V quadrature quadrature modulators
Rf frequency needed for transmission, sends into transmitting power control unit, by transmitting power control unit by the amplitude control of radiofrequency signal
System is exported in the range of needs；Radiofrequency signal from LNA is carried out frequency conversion, output intermediate frequency letter by image frequency rejection mixer
Number, intermediate frequency amplification is then carried out, the signal after amplification by power divider, sends into demodulator, intermediate frequency is passed through on another road all the way
Exported after filtering.
The reception FH spectrum-spreading units share the clock that a crystal resonator is produced with the transmitting FH spectrum-spreading unit.
The image frequency rejection mixer both can be passive or active.
The quadrature quadrature modulator, transmitting power control unit, transmitting FH spectrum-spreading unit, crystal resonator, the first work(
Rate distributor, receive FH spectrum-spreading units, image frequency rejection mixer, intermediate frequency amplifier, the second power divider, first switch, the
Two switches, 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 unit are integrated in one piece of printed board.
According to the embodiment of the present invention, as shown in Figure 3, the mutual interference cancellation unit includes：
Receiving module, for receiving the feedback signal that base station signal and transmission signal are formed after feedback channel, and by institute
The base station signal and the feedback signal received is sent to digital baseband conversion module；
Digital baseband conversion module, connects with the receiving module and digital signal processing module respectively, for by described in
Base station signal and the feedback signal are converted to baseband signal after being mixed, and the baseband signal is exported give numeral letter afterwards
Number processing module；
Digital signal processing module, respectively with the digital baseband conversion module, micro-signal generation module and composite module
Connect, for being filtered by two wave filters that intermediate frequency is respectively first frequency and second frequency to the baseband signal
Ripple, by intermediate frequency to include the base station signal in the signal that is formed after the filter filtering of first frequency, described the
Two frequencies are the frequency at the frequency spectrum cavity-pocket in the base station signal；By by filter filtering of the intermediate frequency for first frequency
The signal formed afterwards is designated as tie point signal, by the letter by intermediate frequency to be formed after the filter filtering of second frequency
Number it is designated as the second tributary signal；Second tributary signal is carried out at backward shift frequency to the first frequency, and its amplitude is put
It is big k times, k>10, form signal to be offseted；The signal to be offseted is subtracted with the tie point signal to obtain feedback pair
Signal after disappearing, the micro-signal generation module and composite module are respectively sent to by signal after the feedback cancellation；
Micro-signal generation module, connects with the digital signal processing module and composite module respectively, for receiving by institute
Signal after the feedback cancellation of digital signal processing module output is stated, and signal after the feedback cancellation is subjected to shift frequency to described the
At two frequencies, then its amplitude narrowed down into original 1/k times, obtain WeChat ID, afterwards export the WeChat ID to combination die
Block；
Composite module, respectively with the digital signal processing module, the micro-signal generation module and Digital Up Convert mould
Block connects, for making signal after the feedback cancellation be added with the WeChat ID to obtain signal to be transmitted, and will be described pending
Signal is penetrated to send to transmitting power control unit.
According to the preferred embodiment of the present invention, as shown in Figure 4, the digital signal processing module includes：
First filtration module, connects with subtraction block, for by intermediate frequency for first frequency wave filter to described
Baseband signal is filtered, and the base station signal is included in the signal formed after filtering；To be the first frequency by intermediate frequency
The signal formed after the filter filtering of rate is designated as tie point signal, and the tie point signal is sent to subtraction mould
Block；
Second filtration module, connects with inverse frequency shift module, for by intermediate frequency for second frequency wave filter to institute
State baseband signal to be filtered, the second frequency is the frequency at the frequency spectrum cavity-pocket in the base station signal；Will be by centre
Frequency is designated as the second tributary signal for the signal that is formed after the filter filtering of second frequency, and by second tributary signal
Send to inverse frequency shift module；
Inverse frequency shift module, connects with second filtration module and amplification module respectively, for second branch road to be believed
Backward shift frequency number is carried out at the first frequency, and the signal after backward shift frequency is sent to amplification module；
Amplification module, connects with the inverse frequency shift module and subtraction block respectively, for by the width of the signal after backward shift frequency
K times of degree amplification, k>10, to form signal to be offseted, the signal to be offseted is sent to subtraction block afterwards；And
Subtraction block, connects with first filtration module and the amplification module, for making the tie point respectively
Signal subtract it is described wait offseting signal with signal after obtaining feedback cancellation.
According to the preferred embodiment of the present invention, the micro-signal generation module includes shift frequency module and drop times module；Institute
Stating shift frequency module is used to carry out at shift frequency to the second frequency signal after the feedback cancellation and export to the drop times mould
Block, the drop times module is used to the amplitude of the signal at shift frequency to the second frequency being contracted to signal after the feedback cancellation
1/k times of amplitude, so as to form WeChat ID.
The mutual interference cancellation unit produces WeChat ID using the method for shift frequency, and WeChat ID is added into Base Transmitter letter
Number frequency spectrum cavity-pocket at, using the WeChat ID and transmission signal only exist the characteristics of frequency position is different with amplitude realize feedback pair
Disappear, it is practical under the conditions of varying Channels without being estimated channel feedback cancellation can be achieved.
According to the embodiment of the present invention, as shown in Figure 5, the microwave transmitting and receiving intelligent protection unit includes：It is micro-
Processor, input power monitor, current monitor, temperature monitoring, VSWR monitor, output power monitor, automatic increasing
Beneficial controller and grid voltage controller；
The input power monitor connects microprocessor, current monitor connection microprocessor, the microprocessor other end
Automatic gain controller, grid voltage controller, output power monitor, VSWR monitor and temperature monitoring, grid are connect respectively
Another termination output power monitor of pole tension controller.
The microwave transmitting and receiving intelligent protection unit has following functions：
1st, input current detection function：Input electric cur- rent measure technology is mainly prevent input voltage due to fractional load short
The device for connecing and causing electric current excessive to damage in module.Input current detection function is devised in input, passes through detection
The voltage at power resistor two ends, and the control source detected into current detection circuit.
2nd, input power detection function：Input power detection be in order to prevent input signal it is excessive cause RF tube cross drive
Move and damage.The radiofrequency signal that the input power of module is sent to input power detection electric circuit inspection input by coupler is big
It is small.If the input radio frequency signal detected is excessive, the grid voltage of power amplifier is constantly in normal closed mode, signal to be entered
Alert and release after reduction, open the supply voltage of grid part.
3rd, power output detection function：Power output detection be in order to prevent power output exceed power amplifier unit power consumption and
Make power amplifier unit long-term work in the state of excess load to damage power amplifier unit.Module power output after coupler,
The radio frequency output signal being coupled out is sent to the size of ouput power detection circuit detection output radiofrequency signal.If detected
Output radiofrequency signal exceed threshold value, then the grid voltage of automatic reduction power amplifier is at semi-open state, letter to be output
Number it is reduced to below threshold value, recovers the voltage of grid part.
4th, VSWR detects function：VSWR detections function is to prevent reflected signal excessive.If reflected signal is excessive, meeting
The efficiency of power amplifier unit is reduced, increases the power consumption of power amplifier unit.And worked for a long time in the environment of higher VSWR, work(can be damaged
Put unit.The reflection power of module passes through coupler, and the radio frequency reflection signal being coupled out is sent into reflection power detection circuit
Detect reflection power size.If the reflection power and the VSWR values of power output that detect exceed after threshold value, automatic drop
The grid voltage of low power amplifier is at semi-open state, and power to be reflected is reduced to below threshold value, recovers grid part
Voltage.
5th, temperature detecting function：Excess temperature alarm be in order to allow module to be preferably operated under normal temperature environment, with
Exempt to cause power amplifier unit to damage because temperature is too high.If the temperature of detection exceedes the threshold value of design temperature, by certainly
Dynamic gain control control voltage, reduction link gain are so that power output is reduced, while the voltage of grid is reduced, in case power amplifier is long
Phase works in an environment of high temperature.
6th, automatic gain control function：In order to prevent the gain fluctuation of radio-frequency module excessive, balance module is in extreme environment
The change of lower gain, keeps original signal amplifying function, automatically adjusting for gain is realized by AGC.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should the protection model with claim
Enclose and be defined.
Claims (4)
1. a kind of microwave radio remote covering system, the system includes：
Hyperfrequency microwave transceiver uni, for microwave signal transmitting-receiving, works in ultra-high frequency band；
Mutual interference cancellation unit, the mutual interference for microwave radio remote covering system receiving and transmitting signal is eliminated, and
Microwave transmitting and receiving intelligent protection unit, the intelligent protection for microwave radio remote covering system output control device；
It is characterized in that：
The hyperfrequency Transmit-Receive Unit includes：Quadrature quadrature modulator, transmitting power control unit, transmitting FH spectrum-spreading unit, crystalline substance
Body resonator, the first power divider, reception FH spectrum-spreading units, image frequency rejection mixer, intermediate frequency amplifier, the second power distribution
Device, first switch, second switch, the first intermediate-frequency filter, the second intermediate-frequency filter, the 3rd intermediate-frequency filter, the 3rd switch, the
Four switches, demodulator, power supply and monitoring unit；
The external base-band input signal of first input port of the quadrature quadrature modulator, the 3rd output of quadrature quadrature modulator
The first port connection of port and transmitting power control unit, the second output port output radio frequency letter of transmitting power control unit
Number；First output port of crystal resonator is connected with the second input port of the first power divider；First power divider
The first output port with receive FH spectrum-spreading units the second input port be connected, the 3rd output port of the first power divider
It is connected with the first input port of transmitting FH spectrum-spreading unit；Second output port of transmitting FH spectrum-spreading unit is modulated with inphase quadrature
Second input port of device is connected；The external radiofrequency signal of first input port of image frequency rejection mixer, image frequency rejection mixer
The second input port with receive FH spectrum-spreading units the first output port be connected, the 3rd output port of image frequency rejection mixer
It is connected with the second input port of intermediate frequency amplifier；First output port of intermediate frequency amplifier and the second of the second power divider
Port is connected；First output port of the second power divider is connected with the second input port of demodulator, the second power distribution
3rd port of device is connected with the second port of first switch；First output port of first switch and the first intermediate-frequency filter
Second input port is connected, and the 3rd output port of first switch is connected with the second input port of second switch；Second switch
The first output port be connected with the second input port of the second intermediate-frequency filter, the 3rd output port of second switch and the 3rd
Second input port of intermediate-frequency filter is connected；Second input of the first output port of the first intermediate-frequency filter and the 4th switch
Port is connected；First output port of the second intermediate-frequency filter is connected with the second input port of the 3rd switch；3rd intermediate frequency is filtered
First output port of ripple device is connected with the 3rd input port of the 3rd switch；First output port of the 3rd switch is opened with the 4th
The 3rd input port closed is connected；The first output port output intermediate-freuqncy signal of 4th switch；First output port of demodulator
It is connected with monitoring unit；The baseband signal of input is directly modulated to the rf frequency needed for transmission by quadrature quadrature modulator, send
Enter transmitting power control unit, controlled the amplitude of radiofrequency signal by transmitting power control unit to export in the range of needs；
Radiofrequency signal from LNA is carried out frequency conversion by image frequency rejection mixer, exports intermediate-freuqncy signal, is then carried out intermediate frequency amplification, is put
Signal after big, by power divider, sends into demodulator, another road is exported after intermediate frequency filtering all the way；
The mutual interference cancellation unit includes：
Receiving module, for receiving the feedback signal that base station signal and transmission signal are formed after feedback channel, and will be received
To the base station signal and the feedback signal send to digital baseband conversion module；
Digital baseband conversion module, connects with the receiving module and digital signal processing module respectively, for by the base station
Signal and the feedback signal are converted to baseband signal after being mixed, and the baseband signal is exported at data signal afterwards
Manage module；
Digital signal processing module, connects with the digital baseband conversion module, micro-signal generation module and composite module respectively,
For being filtered by two wave filters that intermediate frequency is respectively first frequency and second frequency to the baseband signal, by
Intermediate frequency is includes the base station signal, the second frequency in the signal that is formed after the filter filtering of first frequency
For the frequency at the frequency spectrum cavity-pocket in the base station signal；To be shape after the filter filtering of first frequency by intermediate frequency
Into signal be designated as tie point signal, will be designated as by intermediate frequency for the signal that is formed after the filter filtering of second frequency
Second tributary signal；Second tributary signal is carried out at backward shift frequency to the first frequency, and its amplitude is amplified into k times, k
>10, form signal to be offseted；Subtracted with the tie point signal it is described wait offseting signal so as to believing after obtaining feedback cancellation
Number, signal after the feedback cancellation is respectively sent to the micro-signal generation module and composite module；
Micro-signal generation module, connects with the digital signal processing module and composite module respectively, for receiving by the number
Signal after the feedback cancellation of word signal processing module output, and signal after the feedback cancellation is subjected to shift frequency to the described second frequency
At rate, then its amplitude narrowed down into original 1/k times, obtain WeChat ID, afterwards export the WeChat ID to composite module；
Composite module, respectively with the digital signal processing module, the micro-signal generation module and digital up-converter module phase
Connect, for making after the feedback cancellation signal be added with the WeChat ID to obtain signal to be transmitted, and by the letter to be launched
Number send to transmitting power control unit.
2. a kind of the system as claimed in claim 1, the microwave transmitting and receiving intelligent protection unit includes：Microprocessor, input work
Rate monitor, current monitor, temperature monitoring, VSWR monitor, output power monitor, automatic gain controller and grid
Pole tension controller；
The input power monitor connects microprocessor, current monitor connection microprocessor, microprocessor other end difference
Connect automatic gain controller, grid voltage controller, output power monitor, VSWR monitor and temperature monitoring, grid electricity
Another termination output power monitor of pressure controller.
3. a kind of the system as claimed in claim 1, the digital signal processing module includes：
First filtration module, connects with subtraction block, for by intermediate frequency for first frequency wave filter to the base band
Signal is filtered, and the base station signal is included in the signal formed after filtering；To be first frequency by intermediate frequency
The signal formed after filter filtering is designated as tie point signal, and the tie point signal is sent to subtraction block；
Second filtration module, connects with inverse frequency shift module, for by intermediate frequency for second frequency wave filter to the base
Band signal is filtered, and the second frequency is the frequency at the frequency spectrum cavity-pocket in the base station signal；Will be by intermediate frequency
The second tributary signal is designated as the signal that is formed after the filter filtering of second frequency, and second tributary signal is sent
To inverse frequency shift module；
Inverse frequency shift module, connects with second filtration module and amplification module respectively, for second tributary signal to be entered
At row backward shift frequency to the first frequency, and the signal after backward shift frequency is sent to amplification module；
Amplification module, connects with the inverse frequency shift module and subtraction block respectively, for the amplitude of the signal after backward shift frequency to be put
It is big k times, k>10, to form signal to be offseted, the signal to be offseted is sent to subtraction block afterwards；And
Subtraction block, connects with first filtration module and the amplification module respectively, for making the tie point signal
Wait offseting signal with signal after obtaining feedback cancellation described in subtracting.
4. a kind of system as claimed in claim 3, the micro-signal generation module includes shift frequency module and drop times module；It is described
Shift frequency module is used to carry out at shift frequency to the second frequency signal after the feedback cancellation and export to the drop times module,
The drop times module is used to the amplitude of the signal at shift frequency to the second frequency being contracted to signal after the feedback cancellation
1/k times of amplitude, so as to form WeChat ID.
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