CN107425877A - Radio-frequency carrier offsets method and system - Google Patents
Radio-frequency carrier offsets method and system Download PDFInfo
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- CN107425877A CN107425877A CN201710484014.9A CN201710484014A CN107425877A CN 107425877 A CN107425877 A CN 107425877A CN 201710484014 A CN201710484014 A CN 201710484014A CN 107425877 A CN107425877 A CN 107425877A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
Abstract
The present invention provides a kind of radio-frequency carrier and offsets method and system, and wherein radio-frequency carrier offsets method and comprised the following steps：It is first voltage value that I roads control voltage, which is fixedly installed,；Q roads control voltage is scanned in adjusting range, by the first power voltage corresponding to power detecting unit acquisition, the first control voltage value corresponding to the control voltage of Q roads is determined when first power voltage is minimum；It is second voltage value that Q roads control voltage, which is fixedly installed,；I roads control voltage is scanned in adjusting range, by the second power voltage corresponding to power detecting unit acquisition, the second control voltage value corresponding to the control voltage of I roads is determined when second power voltage is minimum.This invention simplifies the mode that radio-frequency carrier offsets, and ensure that the effect that radio-frequency carrier offsets.
Description
Technical field
The present invention relates to technical field of RFID, more particularly to a kind of radio-frequency carrier to offset method and system.
Background technology
Super high frequency radio frequency identification technology uses zero-intermediate-frequency architecture, between radio-frequency identification reader/writer and radio frequency recognizing electronic label
Communicated by the way of " half-duplex ", can also continue transmission carrier wave after radio-frequency identification reader/writer distributes order and know to radio frequency
Other electronic tag is to provide energy.Therefore, at work, its high-power carrier wave launched may pass through radio-frequency identification reader/writer
The number of ways such as internal circuit crosstalk, antenna port reflection leak into receives link.The carrier leak of relatively high power can cause
The receives link linearity is deteriorated, and causes corrupted useful signal, while the noise that carrier leak carries is directly entered receives link, dislikes
Change the background noise of receives link, cause receiving sensitivity to decline.In order to reach good radio frequency identification effect, it is necessary to use
The mode that radio-frequency carrier offsets suppress leakage carrier power, eliminate as much as influence of the carrier leak to receives link.
The principle that radio-frequency carrier offsets is extraction partial carrier wave energy, and one is generated after corresponding amplitude, phase adjustment
Road and carrier leakage signal in constant amplitude it is anti-phase offset signal, offseted with carrier leakage signal.Existing radio-frequency carrier pair
The method that disappears mainly includes：1）Track loop, the amplitude and phase of signal, loop self feed back are offseted by the adjustment of hard wired feed back loop
Adjustment realizes that reaching relatively good after convergence offsets effect.2）Angle is pointed to, and is carried out related resolution to carrier wave leakage signal, is calculated
Go out its initial phase and amplitude, and adjust and offset the phase and amplitude of signal and make it that two paths of signals constant amplitude is anti-phase.Therefore, it is existing
Embodiment either needs the hardware circuit of complexity or needs cumbersome software algorithm to take substantial amounts of processor resource, right
Realize that radio-frequency carrier offsets and propose very high hardware resource requirements.
The content of the invention
It is an object of the invention to provide a kind of radio-frequency carrier to offset method and system, solves radio frequency load in the prior art
Ripple offsets method complexity, the technical problem very high to hardware resource requirements.
In order to solve the above-mentioned technical problem, a kind of radio-frequency carrier of the invention offsets method, and modulator controls electricity according to I roads
Pressure, the output of Q roads control voltage specifically offset signal, are offseted with carrier leak and produce combining signal, pass through power detecting unit
Obtain the power voltage of the combining signal；
Methods described specifically comprises the following steps：
It is first voltage value that I roads control voltage, which is fixedly installed,；
Q roads control voltage is scanned in adjusting range, by the power detecting unit obtain corresponding to the first power voltage,
First power voltage determines the first control voltage value corresponding to the control voltage of Q roads when being minimum；
It is second voltage value that Q roads control voltage, which is fixedly installed,；
I roads control voltage is scanned in adjusting range, by the power detecting unit obtain corresponding to the second power voltage,
The second control voltage value corresponding to the control voltage of I roads is determined when second power voltage is minimum.
Further improvements in methods, I roads control voltage, Q roads control electricity are offseted as the above-mentioned radio-frequency carrier of the present invention
Pressure obtains the precision of the DAC to determine the adjusting range by the DAC outputs of processor control connection.
Further improvements in methods, first power voltage, the second power are offseted as the above-mentioned radio-frequency carrier of the present invention
Voltage calculates the ADC outputs for connecting the power detecting unit by processor, and the ADC outputs cached in the adjusting range become
Change to analyze minimum value.
Further improvements in methods, the first voltage value and/or the second electricity are offseted as the above-mentioned radio-frequency carrier of the present invention
Pressure value is zero.
Further improvements in methods are offseted as the above-mentioned radio-frequency carrier of the present invention, the second voltage value is the described first control
Magnitude of voltage processed, the first voltage value are the second control voltage value, to realize circulation adjustment.
In order to solve the above-mentioned technical problem, a kind of radio-frequency carrier cancellation system of the invention, modulator control electricity according to I roads
Pressure, the output of Q roads control voltage specifically offset signal, are offseted with carrier leak and produce combining signal, pass through power detecting unit
Obtain the power voltage of the combining signal；
The system specifically includes：
First setting unit, it is first voltage value for I roads control voltage to be fixedly installed；
First scanning element, for scanning Q roads control voltage in adjusting range, corresponded to by the power detecting unit
The first power voltage, first power voltage for it is minimum when determine the first control voltage value corresponding to the control voltage of Q roads；
Second setting unit, it is second voltage value for Q roads control voltage to be fixedly installed；
Second scanning element, for scanning I roads control voltage in adjusting range, pass through power detecting unit acquisition pair
The second power voltage answered, the second control voltage corresponding to the control voltage of I roads is determined when second power voltage is minimum
Value.
As the further improvement of the above-mentioned radio-frequency carrier cancellation system of the present invention, I roads control voltage, Q roads control electricity
Pressure obtains the precision of the DAC to determine the adjusting range by the DAC outputs of processor control connection.
As the further improvement of the above-mentioned radio-frequency carrier cancellation system of the present invention, first power voltage, the second power
Voltage calculates the ADC outputs for connecting the power detecting unit by processor, and the ADC outputs cached in the adjusting range become
Change to analyze minimum value.
As the further improvement of the above-mentioned radio-frequency carrier cancellation system of the present invention, the first voltage value and/or the second electricity
Pressure value is zero.
As the further improvement of the above-mentioned radio-frequency carrier cancellation system of the present invention, first scanning element provides described the
One control voltage value is to second setting unit to described in as the second voltage value, second scanning element provides
Second control voltage value gives first setting unit as the first voltage value, adjustment is circulated to realize.
Compared with prior art, the present invention offsets letter by substep adjustment I roads control voltage, Q roads control voltage to adjust
Number, by judging that offseting signal and carrier leak offsets later power voltage, according to the minimum point of power voltage to determine
Optimal I roads control voltage and Q roads control voltage.This invention simplifies the mode that radio-frequency carrier offsets, radio-frequency carrier ensure that
The effect offseted.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Add clear.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of embodiment of the present invention or the technical scheme of prior art
The required accompanying drawing used is briefly described in technology description, it is therefore apparent that drawings in the following description are only the present invention
Described in some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to these accompanying drawings.
Fig. 1 is radio circuit schematic diagram in an embodiment of the present invention.
Fig. 2 is carrier leakage signal Sl planispheres in an embodiment of the present invention.
Fig. 3 is initially to offset signal Sc planispheres in an embodiment of the present invention.
Fig. 4 is carrier leakage signal Sl and initially to offset signal Sc in an embodiment of the present invention and offset later combining and believe
Number Sf planispheres.
Fig. 5 is that carrier leakage signal Sl and ideal offset signal Sc ' planispheres in an embodiment of the present invention.
Fig. 6 is that carrier leakage signal Sl and ideal offset the actual equivalent planispheres of signal Sc ' in an embodiment of the present invention
Fig. 7 is that radio-frequency carrier offsets method flow diagram in an embodiment of the present invention.
Fig. 8 is radio-frequency carrier cancellation system schematic diagram in an embodiment of the present invention.
Embodiment
Below with reference to each embodiment shown in the drawings, the present invention will be described in detail.But these embodiments are not
The limitation present invention, structure that one of ordinary skill in the art is made according to these embodiments, method or change functionally
Change and be all contained in protection scope of the present invention.
It should be noted that in various embodiments, identical label or mark may be used, but these not generations
Absolute contact relation in table structure or function.Also, also not generation such as " first " that is previously mentioned in each embodiment, " second "
Absolute differentiation relation in table structure or function, these are merely for convenience of description.
As shown in figure 1, radio circuit schematic diagram in an embodiment of the present invention.Radio circuit includes modulator 11, balun
12nd, combiner 13, coupling unit 14, power detecting unit 15, processor 160, DAC（Digital to Analog
Converter, digital analog converter）161、ADC（Analog to Digital Converter, analog-digital converter）
162nd, receives link 17.
Modulator 11 in radio circuit offsets signal for generation in the present embodiment, is carried out pair with carrier leak
Disappear, carrier leak is the interference noise as caused by internal circuit and antenna-reflected as described above, by above-mentioned interference noise
Going divided by reach receives link without interruption can be with the effect of normal work.Specifically, a receiving terminal of modulator 11 is carried
Ripple couples, and carrier wave coupling is that the carrier wave of part energy is coupled by directional coupler etc., therefore the signal and hair of carrier wave coupling
The frequency for penetrating carrier wave and carrier leak is consistent.Modulator 11 also includes two control terminals, receives I roads control voltage, the control of Q roads respectively
Voltage processed, by adjusting I roads control voltage, Q roads control voltage to adjust the amplitude and phase of signal of offseting, it then will offset letter
Number export to combiner 13, the carrier leak received with the other end of combiner 13, which offset, produces combining signal, from combiner
13 output end output.Result preferably is offseted in order to reach, i.e., caused combining signal is zero, so to ensure to offset signal
Phase and carrier leakage signal opposite in phase, the amplitude for offseting signal is identical with the amplitude of carrier leakage signal.Need
Bright, the generation environment of carrier leak is relative complex, and the amplitude and phase of carrier leakage signal can not be estimated, therefore
It is exactly the present invention that the signal that offsets of above-mentioned perfect condition how is generated in the case where not knowing the amplitude and phase of carrier leak
Difficult point.Preferably, balun 12 is set between modulator 11 and combiner 13, and balun 12 converts for impedance, for controlling
The direct-connected influence brought of circuit.The output end of combiner 13 is connected with receives link 17, and combining signal after offseting is
When zero, the normal work of receives link 17 would not be had influence on.
In the present embodiment, a closed loop is devised by coupling unit 14, in combiner 13 and receives link
The energy of coupling unit combining signal between 17, for obtaining combining letter by connecting the power detecting unit 15 of coupling unit 14
Number power voltage.Power detecting unit 15 is sequentially connected with ADC162, processor 160, and the power voltage detected is supplied to
Processor 160 is handled.Processor 160 adjusts I roads control voltage, Q roads control voltage according to the power voltage being calculated, specifically
Ground sends the data signal specified, DAC control electricity in I roads according to corresponding to being converted into the data signal specified to the DAC161 of connection
Press, Q roads control voltage, the control terminal with modulator 11 is connected respectively.Processor 160, DAC161, ADC162 are as an entirety
For control unit, the power voltage adjustment output for being provided according to power detecting unit 15 controls electricity to the I roads of modulator 11
Pressure, Q roads control voltage, in more embodiments higher chip of integrated level etc. can be used to replace.
The radio-frequency carrier of present embodiment offsets concept of the method based on planisphere and employs a kind of fuzzy algorithmic approach so that most
The whole result that offsets infinitely tends to theoretical value, has reached and has preferably offseted effect.As shown in figures 2-6, associated radio frequency is introduced first
Orthogonal property of the signal in planisphere, so as to analyze existing inner link between each other.Because offset signal, carrier leak
Orthogonal signalling are belonged to, therefore offsets the combining signal after signal and carrier leak offset and falls within orthogonal signalling, can be
Corresponding point is found by I axles, Q axles in planisphere, in planisphere signal corresponding points to the center of circle the amplitude apart from representation signal,
The phase of the line in signal corresponding points and the center of circle and the angle representation signal of I axles.
As illustrated in fig. 2, it is assumed that carrier leakage signal Sl=asin (t+ θ 1), is by corresponding to I axles, Q axles in planisphere
Point expression,
That is, amplitude a=r1=, 1=arctan of phase theta (Q1/I1).
As shown in figure 3, it is a signal for being intended to be offseted with carrier leakage signal Sl initially to offset signal Sc, it is assumed that Sc
=bsin (t+ θ 2), it is indicated in planisphere and by point corresponding to I axles, Q axles,
That is, amplitude b=r2=, 2=arctan of phase theta (Q2/I2).
Therefore, as shown in figure 4, carrier leakage signal Sl and initially offseting signal Sc and offseting later combining signal Sf and be based on
Orthogonal property value I3=I1+I2 on I axles, value Q3=Q1+Q2 on Q axles, and combining signal Sf corresponding points are according to I3 and Q3
To should determine that,
That is, amplitude r3==,
3=arctan of phase theta (Q3/I3)=arctan ((Q1+Q2)/(I1+I2)).
Further it is not difficult to find out, if the amplitude for wanting combining signal is zero, i.e., only needs to offset I roads component, the Q of signal
The I roads component with carrier leakage signal, Q roads component are positive and negative opposite respectively for road component.Exist as shown in figure 5, ideal offsets signal Sc '
I1 '=- I1 on I axles, Q1 '=- Q1 on Q axles.
In the application of reality, the I roads component of signal is offseted, Q roads component is controlled by the I roads control voltage of modulator, Q roads
Voltage adjustment processed, but due to the difference of modulator, will necessarily there is certain phase difference with carrier leak.As shown in fig. 6,
Carrier leakage signal Sl can be indicated by the first coordinate system that I axles, Q axles form, and ideal offset signal Sc ' can be with equivalent
The second coordinate system to be made up of I ' axles, Q ' axles is indicated, and certain angle between the first coordinate system and the second coordinate system be present
Difference is spent with equivalent above-mentioned difference.And ideal offset signal Sc ' be pass through I ' axles, corresponding point represents on Q ' axles, and actual
Middle modulator is adjusted by I roads control voltage, Q roads control voltage, and corresponding be adjusted in I ' axles, Q ' axles, and is managed
Want to offset I roads component corresponding to signal Sc ', Q roads component is corresponding points respectively to Q ' axle vertical range values I1 ', corresponding points to I '
Axle vertical range value Q1 '.Need what is illustrated, I1 ' ≠-I1 herein, Q1 ' ≠-Q1.It is but from planisphere it can also be seen that logical
Ovennodulation device adjustment I roads control voltage is that Sc ' corresponding points move on Q ' direction of principal axis, and adjustment Q roads control voltage is Sc '
Corresponding points move on I ' direction of principal axis, and both adjustment directions are incoherent, can be adjusted step by step, and Sc ' is corresponding
The ideal position of point with the centrosymmetric place of carrier leak Sl corresponding points, is adjusted required by being necessarily intended to by substep
Ideal position.
The present invention is progressively intended to ideal position by substep adjustment, works as point corresponding to Sc ' and is more proximate to ideal position, carries
Ripple leaks will tend to zero with offseting the amplitude of the later combining signal of signal cancellation, so the width by judging combining signal
Degree can tentatively judges whether the position adjustment of Sc ' corresponding points reaches requirement, and present embodiment need not pay close attention to combining signal
Phase place change, therefore can is directly realized by power detecting unit in radio circuit.
As shown in fig. 7, radio-frequency carrier offsets method flow diagram in an embodiment of the present invention.Radio-frequency carrier offsets method tool
Body comprises the following steps：
Step S1, it is first voltage value that I roads control voltage, which is fixedly installed, and fixed setting I roads control voltage is that guarantee is input to tune
I roads control voltage in device processed is constant, and by keeping I roads control voltage constant, the mode of change Q roads control voltage determines to manage
The Q roads control voltage thought.Preferably, first voltage value can be zero, i.e., corresponding put in figure 6, corresponding to Sc ' moves up in Q ' axles
It is dynamic, progressively it is intended to relative ideal position.
Step S2, Q roads control voltage is scanned in adjusting range, by first corresponding to power detecting unit acquisition
Power voltage, the first control voltage value corresponding to the control voltage of Q roads is determined when first power voltage is minimum.Adjust model
Enclose in the adjustment limit that can refer to radio circuit permission, specifically, the Q roads control electricity that processor as described above is realized with DAC
Pressure adjustment, processor obtain DAC precision, and the mode of acquisition can be matched somebody with somebody by what the parameter or processor inside for reading DAC were set
Confidence ceases.It is then determined that adjustable minimum value and maximum, by way of progressively adjusting, respectively from minimum value to maximum
Or Q roads control voltage is progressively adjusted from peak to peak, the step-length of adjustment is determined by the characteristic of radio circuit in itself,
Now I roads control voltage is constant.The changes in amplitude of combining signal is observed respectively, i.e. analysis is corresponded to by power detecting unit
The first power voltage, the first power voltage, the second power voltage in present embodiment pass through power detecting unit acquisition
Combining signal power voltage, combining signal is that above-mentioned signal and the carrier leak of offseting offsets caused signal.When first
When power voltage is minimum value, it is when I roads control voltage is first voltage value to illustrate point corresponding to Sc ', most levels off to ideal
The situation of position, and now input value corresponding to the control voltage of Q roads is the first control voltage value, the first control voltage value is
Current optimal Q roads control voltage, i.e. Q roads control voltage are most possible to ensure modulator production in the first control voltage value
It is raw to offset signal and eliminate carrier leak.
Step S3, it is second voltage value that Q roads control voltage, which is fixedly installed,.Similarly, step S3 is to ensure to be input to modulator
In Q roads control voltage it is constant, by keeping Q roads control voltage constant, the mode of change I roads control voltage determines preferably
I roads control voltage.In more embodiments, second voltage value can be zero, i.e., corresponding put in figure 6, corresponding to Sc ' exists
Moved on I ' axles, be progressively intended to relative ideal position.
Step S4, I roads control voltage is scanned in adjusting range, by the power detecting unit obtain corresponding to the
Two power voltages, the second control voltage value corresponding to the control voltage of I roads is determined when second power voltage is minimum.With step
Rapid S2 is similar, and I roads control voltage controls the DAC of connection to export by processor, obtains the precision of the DAC to determine the tune
Whole scope.I roads control voltage is scanned in adjusting range, i.e., I roads control voltage is adjusted according to DAC precision substep, due to not
With I roads control voltage cause caused by offset the amplitude of signal, phase is all changed, therefore combining signal is also sent out therewith
Changing, by recording the power magnitude of the second power voltage, i.e. combining signal after adjusting step by step each time, then analyze most
I roads control voltage corresponding to small once substep adjustment, specifically, is calculated by processor and connects the power detecting unit
ADC is exported, and is cached the ADC exporting changes in the adjusting range to analyze minimum value, is drawn corresponding to the control voltage of optimal I roads
Second control voltage value, the second control voltage value herein as input to modulator and offset the I roads of signal to produce and control at present
The ideal value of voltage processed.
By step S1 to step S4, the first control voltage value and the second control voltage value are drawn respectively, and are now passed through
Inputted respectively to modulator Q roads control voltage be the first control voltage value, I roads control voltage be the second control voltage value, produce
The signal that offsets offseted with carrier leak, the effect that the radio-frequency carrier that will reach certain offsets.It should be noted that step
Rapid S1, step S2 can be carried out after step S3, step S4, i.e., first show that the second control voltage value draws the first control electricity again
Pressure value, I roads control voltage, Q roads control voltage are adjusted according to the second control voltage value, the first control voltage value.
Preferably, it is more preferable in order to ensure to offset signal caused by modulator, can be real by the way of circulation adjusts
Existing, specifically, the second voltage value is the first control voltage value, and the first voltage value is second control voltage
Value, to realize circulation adjustment.I.e. after step S1, step S2 completion, obtain the ideal value of Q roads control voltage, i.e., first
Control voltage value, when entering step S3, step S4 adjustment, Q roads control voltage is set to be maintained at preferable first control voltage value,
So as to find preferable I roads control voltage, when step S4 terminates to obtain the second control voltage value, it is further continued for circulation and performs step
S1, step S2, I roads control voltage is maintained at the second control voltage value, finding more preferably Q roads by step S2 controls
Voltage, corresponding first control voltage value is also because further adjustment may change, further, after the change of acquisition
First control voltage value is substituted into step S3, and the rest may be inferred, iterative cycles, multiple according to circulation is actually needed, newest to obtain
The first control voltage value, the second control voltage value to be to adjust Q roads control voltage, I roads control voltage.
In more embodiments, first pass through the ideal value that step S3, step S4 obtain I roads control voltage, i.e., second
Control voltage value, then step S1, step S2 are and then performed, I roads control voltage is maintained at preferable second control voltage value,
So as to find preferable Q roads control voltage, when step S2 terminates to obtain the first control voltage value, it is further continued for circulation and performs step
S3, step S4, Q roads control voltage is maintained at the first control voltage value, finding more preferably I roads by step S4 controls
Voltage, corresponding second control voltage value be able to may also change, further, by the second control voltage after the change of acquisition
Value is substituted into step S1, and the rest may be inferred, iterative cycles, according to circulation is actually needed repeatedly, to obtain the first newest control electricity
Pressure value, the second control voltage value are to adjust Q roads control voltage, I roads control voltage.
In theory, the number of repetitive cycling is more, and the first control voltage value, the second control voltage value update closer therewith
Ideal value, caused to offset result also more preferable.According to the inconsistency of radio circuit, the number control of actual cycle exists
3-5 times is that can reach more satisfactory result, extremely simple efficient compared with the radio-frequency carrier of prior art offsets method.
As shown in figure 8, radio-frequency carrier cancellation system schematic diagram in an embodiment of the present invention.Modulator controls according to I roads
Voltage, the output of Q roads control voltage specifically offset signal, are offseted with carrier leak and produce combining signal, pass through power detection list
Member obtains the power voltage of the combining signal, and radio-frequency carrier cancellation system specifically includes the first setting unit U1, the first scanning
Unit U2, the second setting unit U3, the second scanning element U4.
First setting unit U1, it is first voltage value for I roads control voltage to be fixedly installed, first voltage value is preferably
Zero, i.e., it is zero to offset signal I roads component caused by guarantee.First setting unit U1 and the first scanning element U2 coordinates, and is controlled on I roads
When voltage processed is zero, adjustment Q roads control voltage, so that the value of preferable Q roads control voltage can be quickly found.
First scanning element U2, for scanning Q roads control voltage in adjusting range, obtained by the power detecting unit
First power voltage corresponding to obtaining, the first control corresponding to the control voltage of Q roads is determined when first power voltage is minimum
Magnitude of voltage.Q roads control voltage controls the DAC of connection to export by processor, obtains the precision of the DAC with described in determining
Adjusting range.Q roads control voltage is scanned in adjusting range, i.e. substep adjusts Q roads control voltage, and adjusting step specifically can be by
DAC precision determines, when adjusting Q road control voltages, ensures that I roads control voltage is constant.First power voltage passes through processor
The ADC outputs for connecting the power detecting unit are calculated, cache the ADC exporting changes in the adjusting range to analyze minimum
Value.It is the first control voltage value to select the first power voltage corresponding Q roads control voltage in minimum value.
Second setting unit U3, it is second voltage value for Q roads control voltage to be fixedly installed, second voltage value can be
Zero, can also be using the first control voltage value obtained in the first scanning element U2 as the Q roads control voltage being fixedly installed.With
One setting unit U1 is similar, and the second setting unit U3 and the second scanning element U4 coordinate, and when on Q roads, control voltage is constant, adjusts
Whole I roads control voltage, so that the value of preferable I roads control voltage can be quickly found.
Second scanning element U4, for scanning I roads control voltage in adjusting range, pass through the power detecting unit
Second power voltage corresponding to acquisition, the second control corresponding to the control voltage of I roads is determined when second power voltage is minimum
Magnitude of voltage processed.I roads control voltage controls the DAC of connection to export by processor, obtains the precision of the DAC to determine
State adjusting range.I roads control voltage is scanned in adjusting range, i.e. substep adjustment I roads control voltage, adjusting step specifically may be used
Determined by DAC precision, when adjusting I road control voltages, ensure that Q roads control voltage is constant.Second power voltage passes through processing
Device calculates the ADC outputs for connecting the power detecting unit, caches the ADC exporting changes in the adjusting range to analyze minimum
Value.It is the second control voltage value to select the second power voltage corresponding I roads control voltage in minimum value.
In a preferred embodiment, the first setting unit U1, the first scanning element U2, the second setting unit U3, second
Scanning element U4 joins end to end successively, and the first scanning element U2 provides the first control voltage value and used to the second setting unit U3
Using as the second voltage value, the second scanning element U4 provide the second control voltage value to the first setting unit U1 to
As the first voltage value, to realize circulation adjustment.New more preferable first control voltage is constantly obtained by circulating
Value, the second control voltage value, Q roads control voltage is adjusted according to the first control voltage value, the second control voltage value, I roads control electricity
Press to realize that radio-frequency carrier offsets.Specifically, the control of I roads can be fixedly installed since the first setting unit U1 in initial start
Voltage is zero, or since the second setting unit U3, fixed setting Q roads control voltage is zero.Preferably, according to the feelings of reality
Condition, circulation perform 3-5 times.It should be noted that the embodiment of radio-frequency carrier cancellation system is referred to radio-frequency carrier
Offset the embodiment of method.
With reference to method and technology scheme disclosed in the present application, hardware can be embodied directly in, by the soft of control unit execution
Part module or the two combination, i.e. one or more steps and/or one or more steps combination, both can correspond to computer journey
Each software module of sequence flow, each hardware module, such as ASIC can also be corresponded to（Application Specific
Integrated Circuit, application specific integrated circuit）、FPGA（Field-Programmable Gate Array, scene can compile
Journey gate array）Or other PLDs, discrete gate or transistor logic, discrete hardware components or it is any suitable
Work as combination.For convenience of description, it is divided into various modules with function during description said apparatus to describe respectively, certainly, is implementing this
The function of each module can be realized in same or multiple softwares and/or hardware during application.
As seen through the above description of the embodiments, those skilled in the art can be understood that the application can
Realized by the mode of software plus required general hardware platform.Based on such understanding, the technical scheme essence of the application
On the part that is contributed in other words to prior art can be embodied in the form of software product.The software is by microcontroller list
Member performs, and dependent on required configuration, can include any kind of one or more micro-control units, includes but is not limited to
Micro-control unit, microcontroller, DSP（Digital Signal Processor, Digital Signals unit）Or its any group
Close.The software is stored in memory, for example, volatile memory（Such as random-access memory etc.）, nonvolatile memory
（For example, read-only storage, flash memory etc.）Or its any combination.
In summary, the present invention offsets signal by substep adjustment I roads control voltage, Q roads control voltage to adjust, and passes through
Judgement offsets signal and carrier leak and offsets later power voltage, according to the minimum point of power voltage to determine optimal I
Road control voltage and Q roads control voltage.This invention simplifies the mode that radio-frequency carrier offsets, and ensure that the effect that radio-frequency carrier offsets
Fruit.
It should be appreciated that although the present specification is described in terms of embodiments, not each embodiment only includes one
Individual independent technical scheme, this narrating mode of specification is only that those skilled in the art will should say for clarity
For bright book as an entirety, the technical scheme in each embodiment may also be suitably combined to form those skilled in the art can
With the other embodiment of understanding.
Those listed above is a series of to be described in detail only for feasibility embodiment of the invention specifically
Bright, they simultaneously are not used to limit the scope of the invention, all equivalent implementations made without departing from skill spirit of the present invention
Or change should be included in the scope of the protection.
Claims (10)
1. a kind of radio-frequency carrier offsets method, it is characterised in that modulator exports special according to I roads control voltage, Q roads control voltage
Fixed offsets signal, is offseted with carrier leak and produces combining signal, and the work(of the combining signal is obtained by power detecting unit
Rate voltage；
Methods described specifically comprises the following steps：
It is first voltage value that I roads control voltage, which is fixedly installed,；
Q roads control voltage is scanned in adjusting range, by the power detecting unit obtain corresponding to the first power voltage,
First power voltage determines the first control voltage value corresponding to the control voltage of Q roads when being minimum；
It is second voltage value that Q roads control voltage, which is fixedly installed,；
I roads control voltage is scanned in adjusting range, by the power detecting unit obtain corresponding to the second power voltage,
The second control voltage value corresponding to the control voltage of I roads is determined when second power voltage is minimum.
2. radio-frequency carrier according to claim 1 offsets method, it is characterised in that I roads control voltage, the control of Q roads
Voltage controls the DAC of connection to export by processor, obtains the precision of the DAC to determine the adjusting range.
3. radio-frequency carrier according to claim 1 offsets method, it is characterised in that first power voltage, the second work(
Rate voltage calculates the ADC outputs for connecting the power detecting unit by processor, caches the ADC outputs in the adjusting range
Change to analyze minimum value.
4. radio-frequency carrier according to claim 1 offsets method, it is characterised in that the first voltage value and/or second
Magnitude of voltage is zero.
5. radio-frequency carrier according to claim 1 offsets method, it is characterised in that the second voltage value is described the
One control voltage value, the first voltage value are the second control voltage value, to realize circulation adjustment.
6. a kind of radio-frequency carrier cancellation system, it is characterised in that modulator exports special according to I roads control voltage, Q roads control voltage
Fixed offsets signal, is offseted with carrier leak and produces combining signal, and the work(of the combining signal is obtained by power detecting unit
Rate voltage；
The system specifically includes：
First setting unit, it is first voltage value for I roads control voltage to be fixedly installed；
First scanning element, for scanning Q roads control voltage in adjusting range, corresponded to by the power detecting unit
The first power voltage, first power voltage for it is minimum when determine the first control voltage value corresponding to the control voltage of Q roads；
Second setting unit, it is second voltage value for Q roads control voltage to be fixedly installed；
Second scanning element, for scanning I roads control voltage in adjusting range, pass through power detecting unit acquisition pair
The second power voltage answered, the second control voltage corresponding to the control voltage of I roads is determined when second power voltage is minimum
Value.
7. radio-frequency carrier cancellation system according to claim 6, it is characterised in that I roads control voltage, the control of Q roads
Voltage controls the DAC of connection to export by processor, obtains the precision of the DAC to determine the adjusting range.
8. radio-frequency carrier cancellation system according to claim 6, it is characterised in that first power voltage, the second work(
Rate voltage calculates the ADC outputs for connecting the power detecting unit by processor, caches the ADC outputs in the adjusting range
Change to analyze minimum value.
9. radio-frequency carrier cancellation system according to claim 6, it is characterised in that the first voltage value and/or second
Magnitude of voltage is zero.
10. radio-frequency carrier cancellation system according to claim 6, it is characterised in that first scanning element provides institute
The first control voltage value is stated to second setting unit to as the second voltage value, the second scanning element offer
The second control voltage value gives first setting unit as the first voltage value, adjustment is circulated to realize.
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| CN201710484014.9A CN107425877B (en) | 2017-06-23 | 2017-06-23 | Radio-frequency carrier offsets method and system |
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| CN201710484014.9A CN107425877B (en) | 2017-06-23 | 2017-06-23 | Radio-frequency carrier offsets method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768441A (en) * | 2018-04-24 | 2018-11-06 | 江苏本能科技有限公司 | Carrier wave quickly offsets method, apparatus and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020101270A1 (en) * | 2001-01-30 | 2002-08-01 | Fujitsu Limited | Current pulse receiving circuit |
| CN103595482A (en) * | 2013-11-08 | 2014-02-19 | 武汉邮电科学研究院 | Bias control device and method suitable for dual-polarization IQ modulator |
| CN103873152A (en) * | 2012-12-18 | 2014-06-18 | 武汉邮电科学研究院 | Automatic bias voltage control system and method for light IQ modulator |
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2017
- 2017-06-23 CN CN201710484014.9A patent/CN107425877B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020101270A1 (en) * | 2001-01-30 | 2002-08-01 | Fujitsu Limited | Current pulse receiving circuit |
| CN103873152A (en) * | 2012-12-18 | 2014-06-18 | 武汉邮电科学研究院 | Automatic bias voltage control system and method for light IQ modulator |
| CN103595482A (en) * | 2013-11-08 | 2014-02-19 | 武汉邮电科学研究院 | Bias control device and method suitable for dual-polarization IQ modulator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768441A (en) * | 2018-04-24 | 2018-11-06 | 江苏本能科技有限公司 | Carrier wave quickly offsets method, apparatus and storage medium |
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