CN201369714Y - Digital up converter system with fluctuation adjustment function - Google Patents
Digital up converter system with fluctuation adjustment function Download PDFInfo
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- CN201369714Y CN201369714Y CNU2009200529039U CN200920052903U CN201369714Y CN 201369714 Y CN201369714 Y CN 201369714Y CN U2009200529039 U CNU2009200529039 U CN U2009200529039U CN 200920052903 U CN200920052903 U CN 200920052903U CN 201369714 Y CN201369714 Y CN 201369714Y
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Abstract
A digital up converter system with fluctuation adjustment function comprises a baseband forming filter, a plurality of stages of interpolation filter groups, a modulation processing module, an MCU control module, a fluctuation adjustment control module and a gain adjustment module, wherein the output end of the baseband forming filter passes one by one the different-stage interpolation filter groups and is connected with the input end of the modulation processing module, the input end of the fluctuation adjustment control module is connected with the input end of the MCU control module, the output end thereof is connected with the input end of the gain adjustment module, the output end of the gain adjustment module is connected with the input ends of the baseband forming filter, the different-stage interpolation filter groups and the modulation processing module as well as the output end of the modulation processing module, the fluctuation adjustment control module receives the signal fluctuation corrected value from the MCU control module, and transmits the value to the gain adjustment module, so as to enable the gain adjustment module to realize the control on the link circuit gaining of the digital up converter system, and compensate for the link circuit fluctuation, finally realizing the fluctuation adjustment.
Description
Technical field
The utility model relates to the digital frequency-selecting technology field of radio communication, particularly relates to the Digital Up Convert system with fluctuation calibration function.
Background technology
In mobile communication, because each communication system has all taken the resource of certain frequency scope, therefore, corresponding each communication system all has a specific frequency bandwidth.As Chinese public network gsm radio mobile communication system frequency partition be: 885～915MHz/930～960MHz also is corresponding gsm system, and up-downgoing respectively takies the bin width of 30MHz.Therefore, exploitation is fit to the mobile communication product of GSM standard, just must guarantee that bandwidth is that the interior arbitrary signal of 30MHz all has identical or similar characteristic, to satisfy application demand.
In the ideal case, considering that applied device has the ideal linearity characteristic, at the signal of any bandwidth, is the maintenance level in the frequency band, without any fluctuation.But in real system, because components and parts have different responses to the signal of different frequency, even therefore when the power that different frequency inputs equates, power output is often also unequal, has just produced fluctuation.Generally speaking, analogue amplifier, filter commonly used in the mobile communication equipment are responsive to frequency ratio, filter particularly, because the contradictory relation of two indexs of the outer decay of fluctuation and passband in the passband, common analog filter has the phenomenon of " falling the limit ", and also, the passband edge of filter can fall down the limit, thereby, just produced fluctuation.Therefore, in real system, because the introducing of analogue device unavoidably can be introduced fluctuation.
Because fluctuation is an objective reality, therefore, in practical design, often need constantly equipment to be debugged, to reduce the fluctuation of system.Usual way is to hold inputing or outputing of ceramic filter to add small inductor or little electric capacity, to change the coupling that inputs or outputs of filter, makes the frequency response of this filter change, thereby makes the fluctuation of whole link improve.Though this processing method is effective, because the inconsistency of analogue device, different Circuits System often needs different match circuits, if still adopt this processing method, take time and effort, and, can't realize the mass production of equipment.
Along with the continuous progress of the communication technology, also make current increasing communication products adopt digital technology to realize, handle as the frequency-selecting of adopting digital if technology to finish carrier wave.In the Digital IF Processing system, the major function of digital up converter (DUC) is that the digital signal of input is carried out various modulation and frequency translation, also promptly realizes modulation and mixing in numeric field, and is last, output modulation signal at a high speed.
But because in actual applications, different application models makes that also the framework difference to some extent of Digital Up Convert system, Fig. 1 are the theory diagrams of traditional a kind of Digital Up Convert system.This system is made up of base band formed filter, first order interpolation filter group, second level interpolation filter group and complex modulation processing module, from system architecture, the gain allocation basic fixed of system does not possess the fluctuation calibration function, therefore, can't realize the correcting process that fluctuates.
Therefore, provide a kind of the realization that the compensation of these fluctuations or the Digital Up Convert system of calibration process are necessity in fact.
Summary of the invention
The purpose of this utility model is to solve the passband fluctuation problem in the mobile communication equipment, a kind of Digital Up Convert system that possesses the fluctuation calibration function is provided, advantage by the Applied Digital signal processing technology, the function of expanding digital up-converter system is with the fluctuation problem in effective improvement and the solution equipment.
The utility model provides a kind of Digital Up Convert system that possesses the fluctuation calibration function, it comprises the base band formed filter, some grades of interpolation filter groups, the modulation treatment module, the MCU control module, control module and gain adjustment module are proofreaied and correct in fluctuation, wherein, described base band formed filter output is in proper order by interpolation filter groups at different levels, be connected with the input of modulation treatment module, the input that control module is proofreaied and correct in fluctuation is connected with the output of MCU control module, and its output is connected with the input of gain adjustment module, the output while and the base band formed filter of described gain adjustment module, interpolation filter groups at different levels, the output of the input of modulation treatment module and modulation treatment module is connected, proofread and correct the signal fluctuation correction value of control module reception by fluctuation from the MCU control module, and this value passed to gain adjustment module, realize the link gain of digital up-converter system is controlled by gain adjustment module, and, realize that fluctuation proofreaies and correct to the compensation of link fluctuations.
Compared with prior art, the utlity model has the fluctuation calibration function the Digital Up Convert system have the following advantages:
1, the calibration function that will fluctuate is integrated in the Digital Up Convert system, utilizes Digital Signal Processing, realizes the correction to fluctuation, has expanded the function of Digital Up Convert system;
2, gain controlling and fluctuation correction are combined, when realizing gain controlling, also realized correction, solved the fluctuation problem in the system system fluctuation;
3, the utility model has adopted the processing mode of complex modulation, guarantees I, the consistency of Q signal amplitude and the orthogonality of phase place, thus the negative image signal frequently of good restraining;
4, fluctuation is revised and any one-level in the Digital Up Convert system or what gain controlling can be applied in, and flexibility is good, and is easy to use, has application promise in clinical practice.
Description of drawings
Fig. 1 is the structural representation of existing Digital Up Convert system;
Fig. 2 is the structural representation of the embodiment one of the utility model Digital Up Convert system;
Fig. 3 is the structural representation of the embodiment two of the utility model Digital Up Convert system;
Fig. 4 is the systematic function schematic diagram of the first digital frequency conversion system; And
Fig. 5 is the systematic function schematic diagram of the second digital frequency conversion system.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
With reference to shown in Figure 2, in embodiment one of the present utility model, a kind of Digital Up Convert system 1 that possesses the fluctuation calibration function is provided, it is used for that on the one hand digital signal is carried out Digital Up Convert and handles, proofread and correct control module to the digital signal correction of fluctuating by fluctuation again on the other hand, thereby effectively reduce or the improvement system in fluctuation problem, in embodiment one of the present utility model, described Digital Up Convert system 1 comprises base band formed filter 101, first order interpolation filter group 102, second level interpolation filter group 103, modulation treatment module 104, MCU control module 105, control module 106 and gain adjustment module 107 are proofreaied and correct in fluctuation, wherein, described base band formed filter 101 outputs are in proper order by first order interpolation filter group 102, second level interpolation filter group 103, be connected with the input of modulation treatment module 104, the input that control module 106 is proofreaied and correct in fluctuation is connected with the output of MCU control module 105, and its output is connected with the input of gain adjustment module 107, the output while and the base band formed filter 101 of described gain adjustment module 107, first order interpolation filter group 102, second level interpolation filter group 103, the output of the input of modulation treatment module 104 and modulation treatment module 104 is connected.
In the present embodiment, baseband signal is by 101 inputs of base band formed filter, pass through first order interpolation filter group 102, second level interpolation filter group 103 and modulation treatment module 104 in regular turn, last, by the digital medium-frequency signal after the 104 output modulation of modulation treatment module.Described Digital Up Convert system major function is to realize processing such as the digital filtering of the baseband signal of zero intermediate frequency, interpolation, mixing, output digital medium-frequency signal at a high speed,
Described fluctuation treatment for correcting, its principle is to utilize the automatic scheduling feature of MCU control module 105, by traveling through whole Digital Up Convert system 1 all signal frequency points that need handle, write down the pairing yield value of each frequency, and and the contrast of the standard yield value of reference, obtain corresponding difference, the also corresponding fluctuating range of this difference, undulating value is delivered to Digital Up Convert system 1 by fluctuation correction control module 106 and gain control module 107 particular module will be revised accordingly, carry out oscillation compensation, realize correction fluctuation.
Described MCU control module 105 is control cores of whole Digital Up Convert system, and it obtains the undulating value of corresponding frequency by to each frequency traversal processing, is convenient to follow-up fluctuation and proofreaies and correct.Owing to carry out oscillation compensation by gain adjustment module 107, therefore, this undulating value has not only comprised the difference of fluctuation, also must comprise corresponding standard yield value, also, this undulating value be the fluctuation difference with the standard yield value adding up with.
Control module 106 is proofreaied and correct in described fluctuation, reception is from the fluctuation correction value of MCU control module 105, this value is passed to gain adjustment module 107, simultaneously, this fluctuation is proofreaied and correct control module 106 and is also wanted the gain controlling processing of gating gain adjustment module 107 realizations to the plurality of modules of digital up-converter system 1.Proofreading and correct as this fluctuation is by control base band formed filter 104 input signals or the input signal of first order interpolation filter group, still the both has been controlled together.
Described gain adjustment module 107 is that the link gain of digital up-converter system 1 is controlled on the one hand, on the other hand, is the compensation to link fluctuations, to realize the fluctuation calibration function.
In the utility model, the Digital Signal Processing in the described Digital Up Convert system can be realized by programmable logic devices such as special-purpose asic chip, CPLD, FPGA, EPLD or DSP, preferred asic chip.In order to improve the transmission rate of parallel input data, need to adopt interpolation of data to handle, but interpolation can be introduced the mirror image composition, need carry out filtering, the interpolation of corresponding high multiple is handled, in order to reduce the difficulty of Design of Filter, save device resource, generally to adopt multistage interpolation filter group to realize, preferred two Stage interpolation bank of filters, interpolation filter groups at different levels can be made up of several interpolation filters, and described interpolation filter can be FIR, IIR, CIC or HB and partly is with interpolation filter, and its number can be 1-3.Need realize the processing of 16 haplotype data interpolations as system's first order interpolation, can adopt 4 times of CIC interpolations and FIR interpolation to realize for 4 times, can adopt and directly utilize FIR to realize 16 times of processing of interpolation, also can adopt 2 times of half-band filter interpolations, 2 times of CIC interpolations and FIR interpolation to realize for 4 times.
In the utility model, after the baseband signal of input has been handled by the base band molding filtration, then need not to carry out extra base band forming processes, can omit base band molding filtration processing procedure.Also promptly, can carry out gating to the base band formed filter and handle, can select to use base band formed filter or bypass base band formed filter.
For the ease of understanding, the utility model has also simply been introduced the method that the Digital Up Convert system that uses embodiment one fluctuates and proofreaies and correct.
(1) Shu Ru baseband signal is carried out the moulding Filtering Processing by base band formed filter 101, and output is through the baseband signal behind the formed filter;
(2) be input to first order interpolation filter group 102 through the baseband signal after the molding filtration processing and carry out interpolation of data and Filtering Processing;
(3) be input to second level interpolation filter group 103 through I, Q signal after the first order interpolation and carry out partial interpolation and Filtering Processing, the I behind the interpolation filtering, Q data are input to modulation treatment module 104 again and carry out Frequency mixing processing;
(4) the MCU control module obtains the fluctuation correction value, proofread and correct control module 106 and gain adjustment module 107 by fluctuation, realization is revised the gain controlling and the fluctuation of whole Digital Up Convert system, after handling through gain controlling, by the digital medium-frequency signal after the modulation treatment module output modulation.
With reference to shown in Figure 3, in embodiment two of the present utility model, Digital Up Convert system 2, comprise first order interpolation filter group 201, first order modulation treatment module 202, second level interpolation filter group 203, second level modulation treatment module 204, MCU control module 205, control module 206 and gain adjustment module 207 are proofreaied and correct in fluctuation, wherein, the output of described first order interpolation filter group 201 is in proper order by first order modulation treatment module 202 and second level interpolation filter group 203, be connected with the input of second level modulation treatment module 204, the input that control module 206 is proofreaied and correct in fluctuation is connected with the output of MCU control module 205, and its output is connected with the input of gain adjustment module 207, the output while and the first order interpolation filter group 201 of described gain adjustment module 207, first order modulation treatment module 202, second level interpolation filter group 203, the output of the input of second level modulation treatment module 204 and second level modulation treatment module 204 is connected.
In the utility model, described modulation treatment module also can be made as multistage, the modulation treatment module can be arranged at the output of interpolation filter group, also can be arranged between the interpolation filter groups at different levels, after every grade of interpolation filter group is carried out interpolation and Filtering Processing to baseband signal, promptly enter the modulation treatment module and modulate.
Below simple introduce the method that the Digital Up Convert system that adopts embodiment two fluctuates and proofreaies and correct:
(1) Shu Ru baseband signal is input to first order interpolation filter group 201 and carries out interpolation of data and Filtering Processing;
(2) be input to first order modulation treatment module 202 through I, Q signal after the first order interpolation and carry out first order Frequency mixing processing;
(3) be input to second level interpolation filter group 203 and carry out partial interpolation and Filtering Processing through first order modulated I, Q signal, the I behind the interpolation filtering, Q data are input to second level modulation treatment module 204 again and carry out second level Frequency mixing processing;
(4) the MCU control module obtains the fluctuation correction value, proofread and correct control module 206 and gain adjustment module 207 by fluctuation, realization is revised the gain controlling and the fluctuation of whole Digital Up Convert system, after the gain controlling processing, by the digital medium-frequency signal after the 204 output modulation of second level modulation treatment module.
To have that the digital frequency conversion system is made as the first digital frequency conversion system 10 on first, in the first Digital Up Convert system not to the signal correction of fluctuating; The system that will have the second Digital Up Convert system is made as the second digital frequency conversion system 20, can be to the signal correction of fluctuating in the second Digital Up Convert system.Fig. 4 illustrates the systematic function schematic diagram of the first digital frequency conversion system, and Fig. 5 illustrates the systematic function schematic diagram of the second digital frequency conversion system, with reference to Fig. 4 and shown in Figure 5.In two systems, import two signal a that watt level is identical, frequency is different and signal b respectively, and described signal is passed through A system, each digital frequency conversion system and B system respectively successively.With reference to shown in Figure 4, in the first digital frequency conversion system 10, when signal a passes through the A system, owing to the signal of A system to different frequency, the frequency response difference, therefore, it is unequal that power output becomes, and also promptly produced fluctuation; Then, signal a is again by the first Digital Up Convert system, because the fluctuation of the first Digital Up Convert system is little, so output waveform is similar to the waveform of A system output; At last, signal a is by the B system, because the B system also is the signal to different frequency, its frequency response difference like this, has just further worsened the performance of system, causes fluctuation to become more severe.This shows that if fluctuation is not compensated, the system that may make can't realize due function.With reference to shown in Figure 5, in the second digital frequency conversion system 20, at first, when signal b passes through the A system, similarly, and owing to the signal of A system to different frequency, its frequency response difference, therefore, it is unequal that power output becomes, and also promptly produced fluctuation; Then, signal b is again by the second Digital Up Convert system, because the MCU controller in the second Digital Up Convert system by the processing of traversal frequency, has been known the fluctuation situation of change of whole system, by the gain of different frequency point is set, can realize compensation deals to fluctuation; At last, signal b is again by the B system, because fluctuation is compensated, last, the system fluctuation of output is corrected very smoothly, guarantees that substantially interior ripple disable of whole system band and fluctuation are very little, has realized compensation and correction to fluctuation.
The utility model has carried out the function extension process to traditional Digital Up Convert system, the calibration function that will fluctuate is integrated in the Digital Up Convert system, can realize the fluctuation of system is revised automatically, thereby finish band internal calibration function, with the fluctuation problem in the solution equipment.
The above person of thought, it only is preferred embodiment of the present invention, when not limiting scope of the invention process with this, promptly the content of putting down in writing according to claim of the present invention and description of the invention has generally been done simple equivalent and is changed and modify, and all still belongs within the claim of the present invention institute covering scope.
Claims (6)
- One kind possess the fluctuation calibration function the Digital Up Convert system, it comprises the base band formed filter, some grades of interpolation filter groups and modulation treatment module, described base band formed filter output is in proper order by interpolation filter groups at different levels, be connected with the input of modulation treatment module, it is characterized in that: described Digital Up Convert system also further comprises the MCU control module, control module and gain adjustment module are proofreaied and correct in fluctuation, wherein, the input that control module is proofreaied and correct in fluctuation is connected with the output of MCU control module, and its output is connected with the input of gain adjustment module, the output while and the base band formed filter of described gain adjustment module, interpolation filter groups at different levels, the output of the input of modulation treatment module and modulation treatment module is connected, proofread and correct the signal fluctuation correction value of control module reception by fluctuation from the MCU control module, and this value passed to gain adjustment module, realize the link gain of digital up-converter system is controlled by gain adjustment module, and, realize that fluctuation proofreaies and correct to the compensation of link fluctuations.
- 2. the Digital Up Convert system that possesses the fluctuation calibration function according to claim 1, it is characterized in that: described interpolation filter group is a two-stage.
- 3. the Digital Up Convert system that possesses the fluctuation calibration function according to claim 1 is characterized in that: be provided with several interpolation filters in described interpolation filter group.
- 4. the Digital Up Convert system that possesses the fluctuation calibration function according to claim 3, it is characterized in that: described interpolation filter is that FIR, IIR, CIC or HB partly are with interpolation filter.
- 5. the Digital Up Convert system that possesses the fluctuation calibration function according to claim 4 is characterized in that: the number of described interpolation filter is 1-3.
- 6. the Digital Up Convert system that possesses the fluctuation calibration function according to claim 1 is characterized in that: described modulation treatment module is the plural number level.
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| CNU2009200529039U CN201369714Y (en) | 2009-03-18 | 2009-03-18 | Digital up converter system with fluctuation adjustment function |
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| CNU2009200529039U CN201369714Y (en) | 2009-03-18 | 2009-03-18 | Digital up converter system with fluctuation adjustment function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113542637A (en) * | 2016-07-29 | 2021-10-22 | 索尼公司 | Optical detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113542637A (en) * | 2016-07-29 | 2021-10-22 | 索尼公司 | Optical detection device |
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