CN201127020Y - Wireless same-frequency directly discharging station frequency selector based on digital intermediate frequency - Google Patents
Wireless same-frequency directly discharging station frequency selector based on digital intermediate frequency Download PDFInfo
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- CN201127020Y CN201127020Y CNU200720055848XU CN200720055848U CN201127020Y CN 201127020 Y CN201127020 Y CN 201127020Y CN U200720055848X U CNU200720055848X U CN U200720055848XU CN 200720055848 U CN200720055848 U CN 200720055848U CN 201127020 Y CN201127020 Y CN 201127020Y
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Abstract
The utility model discloses a wireless co-frequency direct amplifying station based on digital medium frequency, including a digital amplifier with variable gain, an AGC module, filter, a high-speed ADC module, a carrier merging unit module, a digital processing module, a high-speed DAC module, wherein the digital amplifier with variable gain connects the high-speed DAC module sequentially through the filter, the high-speed ADC module, the digital processing module and the carrier merging unit module, and output terminal of the AGC module connects with the digital amplifier with variable gain. The utility model is applicable to direct amplifying system of GSM/CDMA/CDMA2000/WCDMA or the like, and is further applicable to direct amplifying system of TD-SCDMA after suitable improvement.
Description
Technical field
The utility model relates to the Mobile communication direct base station field, particularly a kind of wireless intra-frequency repeater frequency-selector based on digital intermediate frequency.
Technical background
In recent years, the mobile communication cause was very fast in China's development, and mobile communications network covers the whole nation substantially.But, need carry out the covering of blind area, base station in order to build the mobile communication overlay network of high-quality.Wireless with frequency-selecting wireless repeater is little owing to its investment frequently, stable performance, the speed of building a station is fast, and is low to environmental requirement, and installation and maintenance are easy, are a kind of equipment of good coverage hole.
With the frequency frequency-selecting wireless repeater is to adopt duplexer work, utilizes forward facing antenna to receive the base station down signal, through low noise amplifier useful signal is amplified, and send power amplifier to amplify through the narrow band filter multiple filter again, is transmitted into travelling carriage by rearward-facing antenna; Utilize rearward-facing antenna receiving mobile upward signal simultaneously, be transmitted into the base station through low noise amplifier, narrow band filter, power amplifier.Its advantage is: with the cost increase coverage territory far below the base station investment, mounting condition is simple, can enlarge network coverage face fast; Improve the utilization rate of equipment and installations of base station, improve the covering quality of existing Cellular Networks.
At present, all adopt the mode of intermediate frequency filtering to carry out at the moving communicating field frequency selecting repeater as everyone knows.Channel is selected to finish by Surface Acoustic Wave Filter, when needs are selected a plurality of carrier wave, needs multichannel frequency-selecting unit.Therefore in the multicarrier application scenario, employing sound table technology is carried out filtering and is had some problems and defective.At first employing sound table filter pass band squareness factor is bad, and is bad to the inhibition ability of interference signal.The phase response of sound table is non-linear simultaneously, can influence quality of signals.Finally cause a series of problems such as the clear or transfer of data of aphthenxia is inaccurate.Secondly in actual applications, need select to amplify repeating transmission to a plurality of carrier waves of base station.The method that solves is to adopt a plurality of narrow band filters, and this needs a plurality of local oscillators the center frequency point of different carrier modulation to narrow band filter, carries out filtering.This can cause the increase of cost, and the increasing of equipment volume.
The utility model content
The purpose of this utility model is to overcome the shortcoming and the deficiency of prior art, a kind of wireless intra-frequency repeater frequency-selector based on digital intermediate frequency is provided, this frequency-selector can increase the carrier number of selecting according to the needs of network capacity, increase the capacity of its coverage, and adopted the technology of digital intermediate frequency, by carrying out filtering, thereby effectively realize with the frequency-selecting function of frequency-selecting wireless repeater frequently at numeric field.
The purpose of this utility model is achieved through the following technical solutions: a kind of wireless intra-frequency repeater frequency-selector based on digital intermediate frequency, comprise numerical control variable gain amplifier, AGC module, filter, high-speed ADC module, carrier wave merge cells module, digital signal processing module, high-speed DAC module, described numerical control variable gain amplifier is connected with the high-speed DAC module by filter, high-speed ADC module, digital signal processing module, carrier wave merge cells module successively, and described AGC module output links to each other with the numerical control variable gain amplifier.
Described digital signal processing module comprises Digital Down Converter Module, gain adjusting circuit, Digital Up Convert module, and wherein Digital Up Convert module is connected with carrier wave merge cells module, and described Digital Down Converter Module is connected with the high-speed ADC module.
Described digital signal processing module is a plurality of.
Described digital signal processing module is realized with field programmable gate array or digital signal processor.
Described Digital Down Converter Module is connected to form successively by digital controlled oscillator, filtration module, abstraction module, and described digital controlled oscillator is connected with the high-speed ADC module, and abstraction module is connected with gain adjusting circuit.
Described Digital Up Convert module is connected to form successively by interpose module, filtration module, digital controlled oscillator, and described interpose module is connected with gain adjusting circuit, and digital controlled oscillator is connected with carrier wave merge cells module.
Described filter is an analog filter.
Operation principle of the present utility model is: input signal is imported by input, by the numerical control variable gain amplifier, the AGC module, the output of numerical control variable gain amplifier is sent into analog filter and is carried out anti-aliasing filter, signal directly send the ADC module to carry out analog-to-digital conversion by analog filter output, digital signal processing module walks abreast and carries out Digital Down Convert, gain-adjusted and Digital Up Convert function, finishing filter gain changes, the function of Digital Up Convert, the output signal of digital signal processing module is sent into the road of closing that carrier wave merge cells module is finished a plurality of carrier waves, and DAC module recovery carrier signal is directly sent in the output of carrier wave merge cells module.
Above-mentioned Digital Down Convert process is the dateout of ADC module to be sent into digital controlled oscillator carry out shift frequency, and signal is transferred to zero-frequency, and the output of digital controlled oscillator is sent into filtration module and carried out filtering, and filtration module output is sent into abstraction module and carried out the processing of reduction of speed rate.
To be gain adjusting circuit be provided with gain according to the order of Monitor And Control Subsystem module to above-mentioned gain-adjusted.
Above-mentioned Digital Up Convert process is interpose module to be sent in gain adjusting circuit output carry out interpolation, and interpolation output is sent into filter and carried out mirror image filtering, and filter output is sent into digital controlled oscillator and carried out frequency translation, and signal is forwarded to intermediate frequency from base band.
The utility model compared with prior art has following advantage and beneficial effect:
1, this utility model can increase the carrier number of selecting according to the needs of network capacity.Increase the capacity of its coverage.This frequency-selecting module has adopted the technology of digital intermediate frequency, by carrying out filtering at numeric field, thereby effectively realizes with the function of the frequency-selecting module of frequency-selecting wireless repeater frequently.
2, this utility model overcomes existing frequency-selecting module complexity height, and out of band signal is suppressed not enough defective, and a kind of novel Mobile communication direct base station frequency-selector is provided.
3, this utility model is to adopt digital if technology, at if sampling, quantizes intermediate-freuqncy signal by high-speed ADC.By Digital Down Convert, carry out filtering in base band, then by the Digital Up Convert recovered carrier signal.So just finish the selection of carrier wave, realized the frequency-selecting function.Carry out digital filtering in base band, improve filtering performance, improve level of integrated system, reduce the use of analogue device, thereby make multicarrier frequency-selecting module practical more.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is a Digital Down Convert gain-adjusted Digital Up Convert theory diagram in the utility model;
Fig. 3 is the realization block diagram of GSM carrier number word select frequency module.
Embodiment
Below in conjunction with drawings and Examples, the utility model is done detailed description further, but execution mode of the present utility model is not limited to this.
As shown in Figure 1 and Figure 2, wireless intra-frequency repeater frequency-selector based on digital intermediate frequency, comprise numerical control variable gain amplifier, AGC module, filter, high-speed ADC module, carrier wave merge cells module, digital signal processing module, high-speed DAC module, described numerical control variable gain amplifier is connected with the high-speed DAC module by filter, high-speed ADC module, digital signal processing module, carrier wave merge cells module successively, and described AGC module output links to each other with the numerical control variable gain amplifier.Above-mentioned digital signal processing module comprises Digital Down Converter Module, gain adjusting circuit, Digital Up Convert module, and wherein Digital Up Convert module is connected with carrier wave merge cells module, and described Digital Down Converter Module is connected with the high-speed ADC module; Wherein digital signal processing module is 1 at least.
Above-mentioned digital signal processing module is field programmable gate array or digital signal processor.
Above-mentioned Digital Down Converter Module is connected to form successively by digital controlled oscillator, filtration module, abstraction module, described digital controlled oscillator is connected with the high-speed ADC module, abstraction module is connected with gain adjusting circuit, this Digital Down Converter Module is used field programmable gate array chip to realize or is had Digital Down Convert function special chip and realizes, special chip has the GC5016 of TI company, GC5318 etc.Above-mentioned Digital Up Convert module is connected to form successively by interpose module, filtration module, digital controlled oscillator, described interpose module and gain adjusting circuit, digital controlled oscillator is connected with carrier wave merge cells module, this Digital Up Convert module is special chip or the field programmable gate array chip with Digital Up Convert function, special chip has the GC5016 of TI company, the AD6636 of GC5316 etc. or ADI company.Above-mentioned high-speed DAC module is the DAC of band interpolation functions or is not with interpolation functions DAC.
Signal processing of the present utility model is: input signal is imported by input, make input signal be no more than certain intensity by numerical control variable gain amplifier and AGC module, input signal is sent into analog filter by the numerical control variable gain amplifier and is carried out anti-aliasing filter, signal directly send the high-speed ADC module to carry out analog-to-digital conversion by analog filter output, digital signal processing module walks abreast and carries out Digital Down Convert, gain-adjusted and Digital Up Convert function, finishing filter gain changes, the function of Digital Up Convert, wherein the function of digital signal processing module realization is duplicate, can adopt special chip also can adopt field programmable gate array, digital signal processor is realized.The output signal of digital signal processing module is sent into the road of closing that carrier wave merge cells module is finished a plurality of carrier waves.The output of carrier wave merge cells module is directly sent into the high-speed DAC module and is finished digital-to-analogue conversion.Wherein the AGC module is calculated the power of ADC sampling, thereby realizes the function of automatic gain control according to control outside ATT.
Above-mentioned digital signal processing module walks abreast and carries out Digital Down Convert, the process of gain-adjusted and Digital Up Convert function is as follows: at first Digital Down Converter Module is carried out the Digital Down Convert operation to the digital medium-frequency signal of input, this operation is that the digital controlled oscillator that the dateout of high-speed ADC module is sent in the Digital Down Converter Module is carried out the signal transfer, signal is transferred to zero-frequency, the filtration module that the output of digital controlled oscillator in the Digital Down Converter Module is sent in the Digital Down Converter Module carries out filtering then, the abstraction module that the output of filtration module in the Digital Down Converter Module is sent in the Digital Down Converter Module carries out the processing of reduction of speed rate again, obtain the carrier wave digital baseband signal of needs respectively, every road carrier wave digital baseband signal is by I, the Q two paths of signals constitutes.Secondly, baseband signal is carried out gain-adjusted by gain adjusting circuit, the interpose module that enters at last in the Digital Up Convert module carries out interpolation, the filtration module that enters after the interpolation in the Digital Up Convert module carries out mirror image filtering, after the filtering again with the Digital Up Convert module in digital controlled oscillator multiply each other and shift, signal is forwarded to intermediate frequency from base band, send into carrier wave merge cells module then and carry out the carrier wave merging.
As shown in Figure 3, GSM carrier number word select frequency module comprises input, AGC module, first digital controlled oscillator, CIC extracts 16 times of modules, a FIR filtration module, gain adjusting circuit, 16 times of CIC interpose modules, the 2nd FIR filtration module, second digital controlled oscillator, DAC module.
The AGC module is used to control the intensity of input GSM signal.The employing speed of ADC module is 65MHz, by first digital controlled oscillator carrier wave is transferred to zero-frequency, cross then CIC extract 16 times of modules carry out 16 times down-sampled, speed becomes 4.0625MHz.Make by a FIR filtration module then and satisfy the outer requirement that suppresses of band.Output speed by gain adjusting circuit still is 4.0625MHz.Carry out 2 times of interpolations by the 2nd FIR filtration module then, output speed is 8.125MHz.The 2nd FIR filtration module is finished the function of interpolation and the compensation of CIC passband.
16 times of CIC interpolation filters are sent in the output of the 2nd FIR filtration module, and 16 times of CIC interpolation filters are output as 130MHz.Transfer to intermediate frequency by second digital controlled oscillator then.The second digital controlled oscillator output speed is 130MHz.The output of second digital controlled oscillator is sent into the DAC module and is carried out digital-to-analogue conversion.Can increase the ability of handling carrier wave by increasing digital processing element.
The foregoing description is the utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (7)
1, a kind of wireless intra-frequency repeater frequency-selector based on digital intermediate frequency, it is characterized in that, comprise numerical control variable gain amplifier, AGC module, filter, high-speed ADC module, carrier wave merge cells module, digital signal processing module, high-speed DAC module, described numerical control variable gain amplifier is connected with the high-speed DAC module by filter, high-speed ADC module, digital signal processing module, carrier wave merge cells module successively, and described AGC module output links to each other with the numerical control variable gain amplifier.
2, a kind of wireless intra-frequency repeater frequency-selector according to claim 1 based on digital intermediate frequency, it is characterized in that, described digital signal processing module comprises Digital Down Converter Module, gain adjusting circuit, Digital Up Convert module, wherein Digital Up Convert module is connected with carrier wave merge cells module, and described Digital Down Converter Module is connected with the high-speed ADC module.
3, a kind of wireless intra-frequency repeater frequency-selector based on digital intermediate frequency according to claim 1 is characterized in that described digital signal processing module is a plurality of.
4, a kind of wireless intra-frequency repeater frequency-selector based on digital intermediate frequency according to claim 1 and 2 is characterized in that described digital signal processing module is realized with field programmable gate array or digital signal processor.
5, a kind of wireless intra-frequency repeater frequency-selector according to claim 2 based on digital intermediate frequency, it is characterized in that, described Digital Down Converter Module is connected to form successively by digital controlled oscillator, filtration module, abstraction module, described digital controlled oscillator is connected with the high-speed ADC module, and abstraction module is connected with gain adjusting circuit.
6, a kind of wireless intra-frequency repeater frequency-selector according to claim 2 based on digital intermediate frequency, it is characterized in that, described Digital Up Convert module is connected to form successively by interpose module, filtration module, digital controlled oscillator, described interpose module is connected with gain adjusting circuit, and digital controlled oscillator is connected with carrier wave merge cells module.
7, a kind of wireless intra-frequency repeater frequency-selector based on digital intermediate frequency according to claim 1 is characterized in that described filter is an analog filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720055848XU CN201127020Y (en) | 2007-08-21 | 2007-08-21 | Wireless same-frequency directly discharging station frequency selector based on digital intermediate frequency |
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| CNU200720055848XU CN201127020Y (en) | 2007-08-21 | 2007-08-21 | Wireless same-frequency directly discharging station frequency selector based on digital intermediate frequency |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119628A (en) * | 2015-09-15 | 2015-12-02 | 福建联拓科技有限公司 | Frequency-selecting device of ARC digital intercom system |
| CN107733465A (en) * | 2016-08-10 | 2018-02-23 | 中兴通讯股份有限公司 | Ultra-wide band signal processing method and device |
| CN109818628A (en) * | 2017-11-21 | 2019-05-28 | 中兴通讯股份有限公司 | Signal processing method, frequency conversion system, storage medium and base station |
-
2007
- 2007-08-21 CN CNU200720055848XU patent/CN201127020Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119628A (en) * | 2015-09-15 | 2015-12-02 | 福建联拓科技有限公司 | Frequency-selecting device of ARC digital intercom system |
| CN107733465A (en) * | 2016-08-10 | 2018-02-23 | 中兴通讯股份有限公司 | Ultra-wide band signal processing method and device |
| CN107733465B (en) * | 2016-08-10 | 2022-01-25 | 中兴通讯股份有限公司 | Super-bandwidth signal processing method and device |
| CN109818628A (en) * | 2017-11-21 | 2019-05-28 | 中兴通讯股份有限公司 | Signal processing method, frequency conversion system, storage medium and base station |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081001 Termination date: 20150821 |
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| EXPY | Termination of patent right or utility model |