CN103152065A - Device and method for modulating signal intermediate frequency digitization receiving - Google Patents
Device and method for modulating signal intermediate frequency digitization receiving Download PDFInfo
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- CN103152065A CN103152065A CN2011104020000A CN201110402000A CN103152065A CN 103152065 A CN103152065 A CN 103152065A CN 2011104020000 A CN2011104020000 A CN 2011104020000A CN 201110402000 A CN201110402000 A CN 201110402000A CN 103152065 A CN103152065 A CN 103152065A
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Abstract
The invention discloses a device and a method for modulating signal intermediate frequency digitization receiving. The device comprises an analog processing module used for enabling received analog signals to be converted to analog intermediate frequency signals in a frequency conversion mode, an analog / digital conversion module used for converting the analog intermediate frequency signals to digital intermediate frequency signals, and a digital processing module used for extracting target digital intermediate frequency signals from the digital intermediate frequency signals, enabling the target digital intermediate frequency signals to be converted to target digital baseband signals in a frequency conversion mode, and then carrying out digital frequency discrimination processing for the target digital baseband signals. Therefore, through the application of the device and the method, complexity of modules in a receiving device can be effectively reduced, requirements for devices in the modules are reduced, and overall performance of the receiving device is improved.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of device and method of modulation signal if digitization reception.
Background technology
The private mobile radio of numeral (Digital Private Mobile Radio, DPMR) and digital mobile radio (Digital Mobile Radio, DMR) be the private radio communication technical specification that ETSI electromagnetic compatibility and wireless frequency spectrum technical committee formulate, wherein, DPMR adopts frequency division multiple access (Frequency Division Multiple Access, FDMA) technology, occupied bandwidth 6.25kHz is mainly used in the digital intercom field; DMR adopts time division multiple access (Time Division Multiple Access, TDMA) technology, and occupied bandwidth 12.5kHz is mainly used in digital intercom field and Digital Clustering field.At present, usually adopt based on the receiving system of simulating frequency discrimination when receiving the DPMR/DMR intermediate-freuqncy signal.
Fig. 1 is based on the schematic diagram of receiving system of simulation frequency discrimination in prior art.Receiving system shown in Figure 1 comprises simulation process module, modulus (Analog/Digital, A/D) transducer and digital base band processor module, in the simulation process module, first utilize filter and frequency mixer that the analog signal frequency conversion that receives is frequency low analog if signal or analog baseband signal, then utilize the simulation frequency discriminator to simulate the frequency discrimination processing to described analog if signal or analog baseband signal, obtain the target simulation baseband signal; A/D converter is converted to the target number baseband signal with described target simulation baseband signal and sends to the digital base band processor module; In the digital base band processor mould, described target number baseband signal is carried out filtering and synchronous demodulation processing.The overall performance of simulation process module is all higher to the requirement of the quality of circuit design, analogue device and operating personnel's proficiency, the frequency discrimination operation of above-mentioned receiving system is completed by the simulation frequency discriminator in the simulation process module, has increased the complexity of simulation process module; After obtaining the target simulation baseband signal by the simulation frequency discriminator, the interference of sneaking into or the distortion that causes will be difficult to eliminate, thereby can have a strong impact on the follow-up synchronous and demodulation performance of receiving system.
Summary of the invention
The device and method that the embodiment of the present invention provides a kind of modulation signal if digitization to receive in order to reduce the complexity of each module in receiving system, improves the overall performance of receiving system.
The device that a kind of modulation signal if digitization that the embodiment of the present invention provides receives comprises:
The simulation process module, the analog signal frequency conversion that is used for receiving is analog if signal;
Analog-to-digital converting module is used for described analog if signal is converted to digital medium-frequency signal;
Digital signal processing module is used for extracting the target number intermediate-freuqncy signal from described digital medium-frequency signal, and is the target number baseband signal with the frequency conversion of described target number intermediate-freuqncy signal, then described target number baseband signal is carried out digital frequency discrimination and processes.
The method that a kind of modulation signal if digitization that the embodiment of the present invention provides receives comprises:
Be analog if signal with the analog signal frequency conversion that receives;
Described analog if signal is converted to digital medium-frequency signal;
Extract the target number intermediate-freuqncy signal from described digital medium-frequency signal, and be the target number baseband signal with the frequency conversion of described target number intermediate-freuqncy signal, then described target number baseband signal is carried out digital frequency discrimination and process.
As seen through the above technical solutions, the device that modulation signal if digitization in the embodiment of the present invention receives comprises simulation process module, analog-to-digital converting module and digital signal processing module, wherein, the simulation process module, the analog signal frequency conversion that is used for receiving is analog if signal; Analog-to-digital converting module is used for described analog if signal is converted to digital medium-frequency signal; Digital signal processing module is used for extracting the target number intermediate-freuqncy signal from described digital medium-frequency signal, and is the target number baseband signal with the frequency conversion of described target number intermediate-freuqncy signal, then described target number baseband signal is carried out digital frequency discrimination and processes.In the receiving system of the embodiment of the present invention, the frequency discrimination operation is completed by digital signal processing module, has simplified the function of simulation process module, has reduced the complexity of simulation process module; Simultaneously, digital signal processing module has carried out first comprising that with the digital medium-frequency signal that receives the extraction that bandpass filtering and reduction of speed rate extract operates, obtain digital medium-frequency signal in range of target frequencies, and then frequency conversion is the target number baseband signal, can satisfy in the situation that the analog if signal frequency of simulation process module output is relatively high, the sampling rate that analog-to-digital converting module uses is relatively low, also reduce the requirement to the quantified precision of analog-to-digital converting module, thereby reduced the requirement to simulation process module and analog-to-digital converting module; In addition, in digital signal processing module, first operate by extraction and obtain digital medium-frequency signal in range of target frequencies, reduced the complexity of subsequent processes in the digital signal processing module.Therefore, the embodiment of the present invention can effectively reduce the complexity of each module in receiving system, reduces the requirement to device in each module, improves the overall performance of receiving system.
Description of drawings
Fig. 1 is based on the schematic diagram of receiving system of simulation frequency discrimination in prior art;
Fig. 2 is the structural representation of a specific embodiment of apparatus of the present invention;
Fig. 3 is the structural representation of digital signal processing module in the embodiment of the present invention;
Fig. 4 is the structural representation of another specific embodiment of apparatus of the present invention;
Fig. 5 is the schematic flow sheet of the inventive method embodiment.
Embodiment
The device that the modulation signal if digitization that the embodiment of the present invention provides receives comprises simulation process module, analog-to-digital converting module and digital signal processing module, and the frequency discrimination operation is completed by the digital frequency discriminator in digital signal processing module.
Below in conjunction with accompanying drawing, apparatus of the present invention are described in detail.
Fig. 2 is the structural representation of a specific embodiment of apparatus of the present invention.
Shown in Figure 2, the device that the modulation signal if digitization that the embodiment of the present invention provides receives comprises: simulation process module 21, analog-to-digital converting module 22 and digital signal processing module 23, wherein,
Described simulation process module 21, the analog signal frequency conversion that is used for receiving is analog if signal;
Described analog-to-digital converting module 22 is used for described analog if signal is converted to digital medium-frequency signal;
Described digital signal processing module 23 is used for extracting the target number intermediate-freuqncy signal from described digital medium-frequency signal, and is the target number baseband signal with the frequency conversion of described target number intermediate-freuqncy signal, then described target number baseband signal is carried out digital frequency discrimination and processes.
Here, the frequency of the analog if signal that described simulation process module 21 obtains can be relatively high, to alleviate the processing load of described simulation process module 21, and described simulation process module 21 is not simulated frequency discrimination to described analog if signal and is processed, reduce the device of described simulation process module 21, simplified the complexity of described simulation process module 21.
Described analog-to-digital converting module 22 is used for described analog if signal is carried out bandpass sampling, quantification and coding, is converted to digital medium-frequency signal and sends to described digital signal processing module 23.described digital signal processing module 23 is not that the digital medium-frequency signal Direct Conversion that will receive is digital baseband signal, but carried out first comprising that the extraction that bandpass filtering and reduction of speed rate extract operates, obtain digital medium-frequency signal in range of target frequencies, and then frequency conversion is the target number baseband signal, therefore, sampling rate when described analog-to-digital converting module 22 carries out bandpass sampling can be relatively low, and detect the sampled signal of zero crossing when quantizing, reduced the requirement to quantified precision, reduced the requirement to described analog-to-digital converting module 22, simultaneously, also reduced the requirement to automatic gain controller spare in described simulation process module 21.
Described digital signal processing module 23 also is further used for carrying out filtering and synchronous demodulation processing with process the digital baseband signal that obtains through digital frequency discrimination.
Fig. 3 is the structural representation of digital signal processing module in the embodiment of the present invention.
Shown in Figure 3, the digital signal processing module 23 in Fig. 2 comprises: extraction unit 31, converter unit 32 and frequency discrimination unit 33, wherein,
Described extraction unit 31 is used for extracting the target number intermediate-freuqncy signal from described digital medium-frequency signal;
Described converter unit 32, being used for is the target number baseband signal with the frequency conversion of described target number intermediate-freuqncy signal;
Described frequency discrimination unit 33 is used for that described target number baseband signal is carried out digital frequency discrimination and processes.
Here, preferably, described extraction unit 31 comprises band pass filter and reduction of speed rate withdrawal device, and described converter unit 32 comprises Digital Down Convert transducer (Digital Down Converter, DDC) and low pass filter.
Owing to carry out the residual intermediate-freuqncy signal of down-conversion operation removal at described converter unit 32 before, add extraction unit 31 and extracted operation, obtain the relatively lower digital medium-frequency signal of frequency as residual intermediate-freuqncy signal, therefore, effectively reduce the processing load of described converter unit 32.
Fig. 4 is the structural representation of another specific embodiment of apparatus of the present invention, and is shown in Figure 4, in the simulation process module, utilizes filter and frequency mixer that the analog signal frequency conversion that receives is f for frequency
IF1Analog if signal send to A/D converter, here, f
IF1Can be relatively high; Described A/D converter is converted to digital medium-frequency signal with the analog if signal that receives, and the frequency of described digital medium-frequency signal is f
IF1In digital signal processing module, before carrying out frequency-conversion processing, add a band pass filter and reduction of speed rate withdrawal device, first utilize described band pass filter to leach the interior digital medium-frequency signal of range of target frequencies, recycling reduction of speed rate withdrawal device obtains the lower residual intermediate frequency of frequency when reducing sample frequency, then utilize DDC and low pass filter to remove residual intermediate frequency, obtain the target number baseband signal, then utilize digital frequency discriminator to carry out frequency discrimination to described target number baseband signal and process, carry out at last follow-up filtering and synchronous demodulation and process.
Fig. 5 is the schematic flow sheet of the inventive method embodiment.
Shown in Figure 5, the method that a kind of modulation signal if digitization that the embodiment of the present invention provides receives comprises following step:
Step 501: be analog if signal with the analog signal frequency conversion that receives.
Here, the frequency of the analog if signal of process frequency conversion acquisition is relatively high.
Step 502: described analog if signal is converted to digital medium-frequency signal.
Here, described analog if signal is carried out bandpass sampling, quantification and coding, be converted to digital medium-frequency signal, the sampling rate of bandpass sampling is relatively low, and detects the sampled signal of zero crossing when quantizing, and has reduced the requirement to quantified precision.
Step 503: extract the target number intermediate-freuqncy signal from described digital medium-frequency signal.
In analog-digital conversion process due to step 502, sampling rate can be extracted the target number intermediate-freuqncy signal lower than the frequency of described analog if signal from the image frequency of described analog if signal.
If carry out saturated to described analog if signal or adopt zero crossing to detect at analog-digital conversion process, the frequency spectrum of the digital medium-frequency signal that is converted to so is with broadened, therefore, extract digital medium-frequency signal in range of target frequencies from the wider digital medium-frequency signal of frequency spectrum.
Step 504: be the target number baseband signal with the frequency conversion of described target number intermediate-freuqncy signal.
Here, described target number intermediate-freuqncy signal is the digital medium-frequency signal in range of target frequencies, has alleviated the processing load of frequency conversion operation.
Step 505: described target number baseband signal is carried out digital frequency discrimination process.
Step 506: will process the digital baseband signal that obtains through digital frequency discrimination and carry out filtering and synchronous demodulation processing.
As seen through the above technical solutions, the device that modulation signal if digitization in the embodiment of the present invention receives comprises simulation process module, analog-to-digital converting module and digital signal processing module, wherein, the simulation process module, the analog signal frequency conversion that is used for receiving is analog if signal; Analog-to-digital converting module is used for described analog if signal is converted to digital medium-frequency signal; Digital signal processing module is used for extracting the target number intermediate-freuqncy signal from described digital medium-frequency signal, and is the target number baseband signal with the frequency conversion of described target number intermediate-freuqncy signal, then described target number baseband signal is carried out digital frequency discrimination and processes.In the receiving system of the embodiment of the present invention, the frequency discrimination operation is completed by digital signal processing module, has simplified the function of simulation process module, has reduced the complexity of simulation process module; Simultaneously, digital signal processing module has carried out first comprising that with the digital medium-frequency signal that receives the extraction that bandpass filtering and reduction of speed rate extract operates, obtain digital medium-frequency signal in range of target frequencies, and then frequency conversion is the target number baseband signal, can satisfy in the situation that the analog if signal frequency of simulation process module output is relatively high, the sampling rate that analog-to-digital converting module uses is relatively low, also reduce the requirement to the quantified precision of analog-to-digital converting module, thereby reduced the requirement to simulation process module and analog-to-digital converting module; In addition, in digital signal processing module, first operate by extraction and obtain digital medium-frequency signal in range of target frequencies, reduced the complexity of subsequent processes in the digital signal processing module.Therefore, the embodiment of the present invention can effectively reduce the complexity of each module in receiving system, reduces the requirement to device in each module, improves the overall performance of receiving system.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and within modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. the device that the modulation signal if digitization receives, is characterized in that, this device comprises:
The simulation process module, the analog signal frequency conversion that is used for receiving is analog if signal;
Analog-to-digital converting module is used for described analog if signal is converted to digital medium-frequency signal;
Digital signal processing module is used for extracting the target number intermediate-freuqncy signal from described digital medium-frequency signal, and is the target number baseband signal with the frequency conversion of described target number intermediate-freuqncy signal, then described target number baseband signal is carried out digital frequency discrimination and processes.
2. device as claimed in claim 1, is characterized in that, described analog-to-digital converting module is used for described analog if signal is carried out bandpass sampling, quantification and coding, is converted to digital medium-frequency signal.
3. device as claimed in claim 1, is characterized in that, described digital signal processing module comprises:
Extraction unit is used for extracting the target number intermediate-freuqncy signal from described digital medium-frequency signal;
Converter unit, being used for is the target number baseband signal with the frequency conversion of described target number intermediate-freuqncy signal;
The frequency discrimination unit is used for that described target number baseband signal is carried out digital frequency discrimination and processes.
4. device as claimed in claim 3, is characterized in that, described extraction unit comprises band pass filter and reduction of speed rate withdrawal device.
5. device as claimed in claim 3, is characterized in that, described converter unit comprises Digital Down Convert transducer DDC and low pass filter.
6. device as claimed in claim 1, is characterized in that, described digital signal processing module also is further used for carrying out filtering and synchronous demodulation processing with process the digital baseband signal that obtains through digital frequency discrimination.
7. the method that the modulation signal if digitization receives, is characterized in that, the method comprises:
Be analog if signal with the analog signal frequency conversion that receives;
Described analog if signal is converted to digital medium-frequency signal;
Extract the target number intermediate-freuqncy signal from described digital medium-frequency signal, and be the target number baseband signal with the frequency conversion of described target number intermediate-freuqncy signal, then described target number baseband signal is carried out digital frequency discrimination and process.
8. method as claimed in claim 7, is characterized in that, described analog if signal is converted to digital medium-frequency signal, comprising:
Described analog if signal is carried out bandpass sampling, quantification and coding, be converted to digital medium-frequency signal.
9. method as claimed in claim 7, is characterized in that, the method also further comprises:
To process the digital baseband signal that obtains through digital frequency discrimination and carry out filtering and synchronous demodulation processing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104020000A CN103152065A (en) | 2011-12-06 | 2011-12-06 | Device and method for modulating signal intermediate frequency digitization receiving |
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| CN2011104020000A CN103152065A (en) | 2011-12-06 | 2011-12-06 | Device and method for modulating signal intermediate frequency digitization receiving |
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Cited By (2)
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| CN106788512A (en) * | 2017-01-18 | 2017-05-31 | 深圳市楷诺无线通信有限公司 | A kind of digital handset receiver demodulating system |
| CN111917428A (en) * | 2020-07-21 | 2020-11-10 | 湖南拉盖尔电子科技有限公司 | Digital intermediate frequency signal rapid baseband and down-sampling method |
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| CN111917428A (en) * | 2020-07-21 | 2020-11-10 | 湖南拉盖尔电子科技有限公司 | Digital intermediate frequency signal rapid baseband and down-sampling method |
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Application publication date: 20130612 |