CN201222807Y - Digital radio frequency zooming system with variable bandwidth - Google Patents
Digital radio frequency zooming system with variable bandwidth Download PDFInfo
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- CN201222807Y CN201222807Y CNU2008200480761U CN200820048076U CN201222807Y CN 201222807 Y CN201222807 Y CN 201222807Y CN U2008200480761 U CNU2008200480761 U CN U2008200480761U CN 200820048076 U CN200820048076 U CN 200820048076U CN 201222807 Y CN201222807 Y CN 201222807Y
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Abstract
The utility model discloses a digital remote radio system with variable bandwidth, which achieves of changing the bandwidth of the digital remote radio system, wherein after being digitized and treated through a baseband, communication signals in an uplink and/or a down link are filtered using a digital filter module, the digital filter module sends signals to change a passband bandwidth characteristic parameter through a monitoring module, the presupposition of the bandwidth parameter is achieved, thereby adjusting the characteristic parameter to meet a needed bandwidth in a link circuit. Compared with the prior art, the digital remote radio system with the variable bandwidth has the advantages that: firstly, the digital remote radio system with the variable bandwidth uses the monitoring module to collocate data of the digital filter module through a specific algorithm, thereby achieving that the demands of clients for the bandwidth are met. When the demands of clients for the bandwidth change, just configuration data which are provided from a trigger module just need to be changed and monitored, and the digital remote radio system has more applicability. Secondly, the digital remote radio system with the variable bandwidth reduces the cost of materials and the production cost.
Description
[technical field]
The present invention relates to the Mobile communication direct base station technology, relate in particular to a kind of digital RF far-drawing system of adaptive-bandwidth.
[technical background]
Digital RF far-drawing system, the Base Band Unit and the Remote Radio Unit radio frequency unit that comprise the base station baseband unit in order to cover by antenna, by the transfer of data between Base Band Unit and the Remote Radio Unit radio frequency unit, the uplink and downlink of practical communication data control.
Wherein, traditional radio implementation method all is is core with hardware, be purpose with the special applications, and at each independently wave point and combination of various frequency range, specialized designs has the integrated circuit of special purpose and specific function accordingly and realizes.The ability that such terminal is had when design or manufacturing just has been fixed up by hardware encoding, for mode of operation or the working frequency range that increases required support, just needs extra increase functional unit block.
When this radio implementation method is applied in the digital RF far-drawing system, show in the design of digital up converter and low-converter, must adapt to different bandwidth requirements selects for use special-purpose frequency conversion chip to realize different band merits, therefore, after in case the bandwidth of far-drawing system is specified, its employed internal circuit just has been fixed up, and can only be applicable to the application scenario with nominated bandwidth.Be installed in the occasion of different bandwidth requirement as need, then must change its internal circuit, especially digital up converter and the employed chip of digital down converter and must adapt to new bandwidth requirement and change.
Thus, the radio implementation method that is adopted in traditional far-drawing system does not have portability, and its bandwidth of operation does not have controllability, in addition, selected parts is limited to, thereby cause production cost surging.
[summary of the invention]
For this reason, purpose of the present invention will overcome above-mentioned deficiency exactly, and a kind of digital RF far-drawing system of adaptive-bandwidth is provided, and makes the portability of digital RF far-drawing system be able to further lifting.
For realizing this purpose, the present invention adopts following technical scheme:
The digital RF far-drawing system of a kind of adaptive-bandwidth of the present invention, comprise Base Band Unit and Remote Radio Unit radio frequency unit, form down link and up link jointly by Base Band Unit and Remote Radio Unit, the two ends of down link and up link are all by the duplexer routing
Down link and/or up link are equipped with and place the baseband processing module of finishing affiliated link base band data processing and format conversion in Remote Radio Unit and the Base Band Unit respectively, down link in the baseband processing module of its Remote Radio Unit and/or up link belong in the baseband processing module of Base Band Unit at it, be provided with digital filtering module, limited by the pass band width characterisitic parameter of himself, be used for the outer signal of the certain bandwidth range of filtering, with required communication bandwidth in the link under keeping;
Described digital filtering module and monitoring module electrically connect, monitoring module is preset with the algorithm of the corresponding relation between the pass band width characterisitic parameter that characterizes affiliated required bandwidth of link of digital filtering module and filtration module, and monitoring module calculates the pass band width characterisitic parameter of filtration module automatically according to the required bandwidth of link and digital filtering module is adjusted.
Described far-drawing system comprises a Surveillance center, electrically connects with described each monitoring module, and this Surveillance center provides the operation that the pass band width characterisitic parameter of corresponding digital filtration module artificially is set respectively by each monitoring module.
Described digital filtering module comprises the function sub-modules that the filter submodule electrically connects with it.
Down link and/or up link are equipped with the corresponding simulation of each two cover frequency-variable module, unscented transformation module, the digital frequency conversion module that places respectively in Remote Radio Unit and the Base Band Unit,
Two of same link simulation frequency-variable modules, the direction in the radiofrequency signal input downconverts to analog intermediate frequency signal with signal respectively, and in the direction of signal output with the analog intermediate frequency signal up-conversion to radio frequency;
Two unscented transformation modules of same link are respectively digital signal with the analog signal conversion of intermediate frequency and the digital signal of intermediate frequency is converted to analog signal;
Two digital frequency-variable modules of same link down-convert to digital intermediate frequency signal digital baseband signal respectively and send into the baseband processing module of unit and will up-convert to digital intermediate frequency signal through the baseband signal with the baseband processing module output of unit.
In the same link, the base station processing module that is in the baseband processing module of Base Band Unit and is in Remote Radio Unit by light receive/send out a submodule and be that media is looked logical with optical fiber.
In described Base Band Unit/Remote Radio Unit, the baseband processing module of up link and down link is integrated by same chip.
Compared with prior art, the present invention possesses following advantage: at first, the present invention utilizes described monitoring module by special algorithm the data configuration of digital filtering module to be realized satisfying client's bandwidth demand, when client's bandwidth demand changes, only need to change the configuration data that monitoring slave submodule provides, need not to change hardware, make native system have more applicability like this at the covering scene; Secondly, generality of hardware can reduce material cost and production cost for production firm.
[description of drawings]
Fig. 1 is the theory diagram of digital RF far-drawing system of the present invention.
Fig. 2 is the theory diagram of the descending digital module of Base Band Unit of the present invention.
Fig. 3 is the theory diagram of the descending digital frequency conversion module of Base Band Unit of the present invention.
Fig. 4 is the theory diagram of the descending digital module of Remote Radio Unit of the present invention.
Fig. 5 is the theory diagram of the descending digital frequency conversion module of Remote Radio Unit of the present invention.
Fig. 6 is the theory diagram of digital filtering module of the present invention.
Fig. 7 is the theory diagram of Remote Radio Unit upstream digital module of the present invention.
Fig. 8 is the theory diagram of Remote Radio Unit upstream digital frequency-variable module of the present invention.
Fig. 9 is the theory diagram of Base Band Unit upstream digital module of the present invention.
Figure 10 is the theory diagram of Base Band Unit upstream digital frequency-variable module of the present invention.
Figure 11 is the theory diagram of digital filtering module of the present invention.
[embodiment]
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing.
Fig. 1～Figure 11 shows concrete structure of the present invention.By above-mentioned figure as seen, the digital RF far-drawing system of this adaptive-bandwidth is divided into Base Band Unit and Remote Radio Unit two parts, and Base Band Unit is connected with mobile communication base station 01 by coupler 02; Base Band Unit links to each other by optical fiber with Remote Radio Unit, forms the up link and the down link of signal transmission.
Consult Fig. 1, described Base Band Unit comprises duplexer 11, descending simulation frequency-variable module 12, descending digital module 13, up simulation frequency-variable module 14, upstream digital module 15;
Descending digital module 13 (consulting Fig. 1) shown in Figure 2 comprises that modulus unscented transformation module 131, descending digital frequency conversion module 132, downgoing baseband processing module 133, light sends out submodule 134, descending monitoring module 135; As shown in Figures 2 and 3, described descending digital frequency conversion module 132 comprises descending down-conversion digital mixer 1321 and descending down-conversion numerically-controlled oscillator 1322;
In conjunction with Fig. 1 and Fig. 9, described upstream digital module 15 comprises light receipts submodule 151, uplink baseband processing module 152, upstream digital frequency-variable module 153, digital-to-analogue unscented transformation module 154, up monitoring module 155; In conjunction with Fig. 9 and Figure 10, described upstream digital frequency-variable module 153 comprises up up-conversion digital mixer 1531 and up up-conversion numerically-controlled oscillator 1532;
See also Fig. 9, uplink baseband processing module 152 comprises data transaction submodule 156, digital filtering module 157.In conjunction with Fig. 9 and Figure 11, described digital filtering module 157 comprises filter submodule 1571 and function sub-modules 1572;
In conjunction with Fig. 1 to 3 and Fig. 9 to 11, duplexer 11 in the described Base Band Unit is connected with up simulation frequency-variable module 14 simultaneously with descending simulation frequency-variable module 12 simultaneously, descending simulation frequency-variable module 12 is connected with near-end digital module 13, and described up simulation frequency-variable module 14 is connected 15 with the upstream digital module; Modulus unscented transformation module 131, descending digital frequency conversion module 132, downgoing baseband processing module 133, light are sent out submodule 134 and are connected successively in the described descending digital module 13, and descending monitoring module 135 is connected with descending down-conversion numerically-controlled oscillator 1322 in the descending digital frequency conversion module 132 by data wire; Light receipts submodule 151, uplink baseband processing module 152, upstream digital frequency-variable module 153, digital-to-analogue unscented transformation module 154 connect successively in the described upstream digital module 15, data transaction submodule 156 is connected successively with digital filtering module 157 in the uplink baseband processing module 152, and up monitoring module 155 is connected with digital filtering module 157 in the near-end uplink baseband processing module 152 by the up up-conversion numerically-controlled oscillator 1532 in data wire and the upstream digital frequency-variable module 153.
See also Fig. 1, described Remote Radio Unit comprises descending digital module 21, descending simulation frequency-variable module 22, power amplifier module 23, far-end duplexer 27, low noise amplification module 26, up simulation frequency-variable module 25, upstream digital module 24;
In conjunction with Fig. 1 and Fig. 4, described descending digital module 21 comprises light receipts submodule 211, downgoing baseband processing module 212, descending digital frequency conversion module 213, digital-to-analogue unscented transformation module 214, descending monitoring module 215; In conjunction with Fig. 4 and Fig. 5, described descending digital frequency conversion module 213 comprises descending up-conversion digital mixer 2131 and descending up-conversion numerically-controlled oscillator 2132;
Described downgoing baseband processing module 212 comprises data transaction submodule 216, digital filtering module 217; In conjunction with Fig. 4 and Fig. 6, described digital filtering module 217 comprises filter submodule 2171 and function sub-modules 2172;
In conjunction with Fig. 1 and Fig. 7, described upstream digital module 24 comprises that modulus unscented transformation module 241, upstream digital frequency-variable module 242, uplink baseband processing module 243, light sends out submodule 244, up monitoring module 245;
Comprise up down-conversion digital mixer 2421 and up down-conversion numerically-controlled oscillator 2422 in conjunction with Fig. 7 and the described upstream digital frequency-variable module 242 of Fig. 8;
In conjunction with Fig. 1, Fig. 4 to Fig. 8, in the Remote Radio Unit, described descending digital module 21 is connected with power amplifier module 23 by descending simulation frequency-variable module 22, duplexer 27 is connected with low noise amplification module 26 with power amplifier module 23 simultaneously, and low noise amplification module 26 is connected with upstream digital module 24 by up simulation frequency-variable module 25; Light receipts submodule 211, downgoing baseband processing module 212, the descending digital frequency conversion module 213 of far-end, digital-to-analogue unscented transformation module 214 connect successively in the described descending digital module 21, data transaction submodule 216 is connected successively with digital filtering module 217 in the downgoing baseband processing module 212, and descending monitoring module 215 is connected with digital filtering module 217 in the downgoing baseband processing module 212 by the descending up-conversion numerically-controlled oscillator 2132 in data wire and the descending digital frequency conversion module 213; Modulus unscented transformation module 241, upstream digital frequency-variable module 242, uplink baseband processing module 243, light are sent out submodule 244 and are connected successively in the described upstream digital module 24, and up monitoring module 245 is connected with up down-conversion numerically-controlled oscillator 2422 in the upstream digital frequency-variable module 242 by data wire.
The signal that mobile communication base station 01 produces is sent to the near-end duplexer 11 of Base Band Unit by coupler 02, duplexer 11 is isolated downlink radio-frequency signal, downlink radio-frequency signal becomes analog if signal through the mixing of descending simulation frequency-variable module 12, this analog signal can be broadband signal, also can be multi-carrier signal;
Become digital medium-frequency signal after the modulus sampling of analog if signal through the modulus unscented transformation module 131 in the descending digital module 13;
Descending digital frequency conversion module 132 downconverts to descending digital baseband signal with digital medium-frequency signal;
Be packaged into the transmission signals that is fit to standard interface protocol after the Data Format Transform of this digital baseband signal through data transaction submodule 137 in the downgoing baseband processing module 133, send out submodule 134 through light again and be modulated to light signal is sent to Remote Radio Unit by optical fiber descending digital module 21;
The light of light signal in descending digital module 21 is received submodule 211 and is demodulated transmission signals, through the Data Format Transform of data transaction submodule 216 and the filter shape of digital filtering module 217, is reduced to the digital baseband signal with certain bandwidth;
Descending digital frequency conversion module 213 with this digital baseband signal up-conversion to digital medium-frequency signal; Digital medium-frequency signal is touched the analog if signal that conversion reverts to respective bandwidth through the number of digital-to-analogue unscented transformation module 214;
Analog if signal by the mixing of descending simulation frequency-variable module 22 after reduction become downlink radio-frequency signal, downlink radio-frequency signal amplifies through power amplifier module 23 and duplexer 27 outputs to cover antenna 03 and is transmitted into the interior travelling carriage (as mobile phone) of the area of coverage;
More than be that downstream signal covers principle, just opposite for its transfer process of upward signal.
The signal that travelling carriage (mobile phone) in the overlay area sends, receive after duplexer 22 is isolated up radiofrequency signal by cover antenna 03, radiofrequency signal becomes analog if signal through the amplification of low noise amplification module 26 and the mixing of up simulation frequency-variable module 25, this analog signal can be broadband signal, also can be multi-carrier signal;
Become digital medium-frequency signal after the modulus sampling of analog if signal through the modulus unscented transformation module 241 in the far-end upstream digital module 24;
Upstream digital frequency-variable module 242 in the Remote Radio Unit downconverts to the upstream digital baseband signal with digital medium-frequency signal, be packaged into the transmission signals that is fit to standard interface protocol after the Data Format Transform of baseband signal through data transaction submodule 247, send out submodule 244 through light again and be modulated to light signal is sent to Base Band Unit by optical fiber upstream digital module 15;
The light of light signal in descending digital module 15 is received submodule 151 and is demodulated transmission signals, through the Data Format Transform of data transaction submodule 156 and the filter shape of digital filtering module 157, is reduced to the digital baseband signal with certain bandwidth;
Upstream digital frequency-variable module 153 with this digital baseband signal up-conversion to digital medium-frequency signal; Digital medium-frequency signal is touched the analog if signal that conversion reverts to respective bandwidth through the number of digital-to-analogue unscented transformation module 154;
Analog if signal by the mixing of up simulation frequency-variable module 14 after reduction become up radiofrequency signal, up radiofrequency signal transfers to mobile communication base station 01 through duplexer 11 with signal.
Described control bandwidth varying process is: in the down link, at Remote Radio Unit of the present invention, be reduced to digital baseband signal after the demodulation of signal process light receipts submodule 211 and the Data Format Transform of data transaction submodule 216, this digital baseband signal is through the filtering of digital filtering module 217 median filter submodules 2171, become digital baseband signal with certain bandwidth, and descending monitoring module 215 comes the pass band width parameter characteristic of control filters submodule 2171 by data wire, that is come the pass-band performance of control filters submodule 2171 as required, and then the bandwidth of control down link signal by descending monitoring module 215.Concrete process is: system is at powered on moment, descending monitoring module 215 is according to the special algorithm of internal preset, the demand parameter of bandwidth in the down link is scaled the characterisitic parameter of the filter of filter submodule 2171 control respective bandwidth needs, send this parameter to filter submodule 2171 with the signal of telecommunication by data wire, come the bandwidth of control figure baseband signal by the pass band width characterisitic parameter of control filters submodule 2171, and then controlled the bandwidth of the mobile communication signal of down link; In the up link, at Base Band Unit of the present invention, be reduced to digital baseband signal after the demodulation of signal process light receipts submodule 151 and the Data Format Transform of data transaction submodule 156, this digital baseband signal is through the filtering of digital filtering module 157 median filter submodules 1571, become digital baseband signal with certain bandwidth, and up monitoring module 155 comes the low pass bandwidth parameter characteristic of control filters submodule 1571 by data wire, that is come the pass band width characterisitic parameter of control filters submodule 1571 as required, and then the bandwidth of control uplink signal by up monitoring module 155.Concrete process is: equipment is at powered on moment, up monitoring module 155 is according to the special algorithm of internal preset, the demand parameter of bandwidth is scaled the characterisitic parameter of the filter of filter submodule 1571 control respective bandwidth needs, send this parameter to filter submodule 1571 with the signal of telecommunication by data wire, come the bandwidth of control figure baseband signal by the pass band width characterisitic parameter of control filters submodule 1571, and then controlled the bandwidth of the mobile communication signal of up link; So if user's bandwidth parameter changes, only need by changing the pass band width characterisitic parameter of descending monitoring module 215 and 155, just can change the filtering characteristic of the filter submodule 1571 of downlink filter submodule 2171 and up link respectively, and then control the signal bandwidth of down link and up link by data wire.
In descending digital module 13 of the present invention, described downgoing baseband processing module 133 is integrated in a FPGA or the dsp chip; Modulus unscented transformation module 131 in the described descending digital module 13 can be suitable for special chip respectively with descending digital frequency conversion module 132 and realize, the special chip that also can use a slice to have analog-digital conversion function and Digital Down Convert function simultaneously realizes, also can be that descending digital frequency conversion module 132 is integrated in FPGA or dsp chip and modulus unscented transformation module 131 is still used special chip; Described descending monitoring module 135 can use special chip to realize.
In upstream digital module 15 of the present invention, described uplink baseband processing module 152 is integrated in a FPGA or the dsp chip; Digital-to-analogue unscented transformation module 154 in the described upstream digital module 15 can be suitable for special chip respectively with upstream digital frequency-variable module 153 and realize, the special chip that also can use a slice to have digital-to-analogue conversion function and Digital Up Convert function simultaneously realizes, also can be that near-end upstream digital frequency-variable module 153 is integrated in FPGA or dsp chip and digital-to-analogue unscented transformation module 154 is still used special chip; Described up monitoring module 155 can use special chip to realize.
In descending digital module 21 of the present invention, described downgoing baseband processing module 212 is integrated in a FPGA or the dsp chip; Digital-to-analogue unscented transformation module 214 in the described descending digital module 21 can be suitable for special chip respectively with descending digital frequency conversion module 213 and realize, the special chip that also can use a slice to have digital-to-analogue conversion function and Digital Up Convert function simultaneously realizes, also can be that descending digital frequency conversion module 213 is integrated in FPGA or dsp chip and digital-to-analogue unscented transformation module 214 is still used special chip; Described descending monitoring module 215 can use special chip to realize.
Determine in 24 at upstream digital mould of the present invention, described far-end uplink baseband processing module 243 is integrated in a FPGA or the dsp chip; Modulus unscented transformation module 241 in the described upstream digital module can be suitable for special chip respectively with upstream digital frequency-variable module 242 and realize, the special chip that also can use a slice to have analog-digital conversion function and Digital Down Convert function simultaneously realizes, also can be that upstream digital frequency-variable module 242 is integrated in FPGA or dsp chip and modulus unscented transformation module 241 is still used special chip; Described up monitoring module 245 can use special chip to realize.
Described uplink baseband processing module 152 and downgoing baseband processing module 133 also can be integrated in same FPGA or the dsp chip;
Described uplink baseband processing module 243 and downgoing baseband processing module 212 also can be integrated in same FPGA or the dsp chip;
The up monitoring module 155 of described descending monitoring module 135 and near-end can be integrated in the same special chip.
Described each monitoring module 135,155,215,245 all can be by electrically connecting with a Surveillance center, accept Surveillance center and change its algorithm or its result of calculation, act on described each corresponding digital filtration module, thereby can carry out the bandwidth that each link is changed in manual operation by Surveillance center (not shown) for the user.Surveillance center generally adopts computer to add special-purpose software and realizes.
Described filter submodule 2171 can adopt wave digital lowpass filter, also can adopt digital band-pass filter;
Described filter submodule 1571 can adopt wave digital lowpass filter, also can adopt digital band-pass filter.
To sum up, by far-drawing system of the invention process, can realize the possibility of adaptive-bandwidth, automatic or manual all can; And, because the present invention can use chips such as FPGA, DSP, thereby also make cost than adopting dedicated devices to reduce greatly.
The foregoing description is a preferred implementation of the present invention; but its execution mode is not subjected to above-mentioned restriction; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (6)
1, a kind of digital RF far-drawing system of adaptive-bandwidth, comprise Base Band Unit and Remote Radio Unit radio frequency unit, form down link and up link jointly by Base Band Unit and Remote Radio Unit, the two ends of down link and up link all by the duplexer routing, is characterized in that:
Down link and/or up link are equipped with and place the baseband processing module of finishing affiliated link base band data processing and format conversion in Remote Radio Unit and the Base Band Unit respectively, down link in the baseband processing module of its Remote Radio Unit and/or up link belong in the baseband processing module of Base Band Unit at it, be provided with digital filtering module, limited by the pass band width characterisitic parameter of himself, be used for the outer signal of the certain bandwidth range of filtering, with required communication bandwidth in the link under keeping;
Described digital filtering module and monitoring module electrically connect, monitoring module is preset with the algorithm of the corresponding relation between the pass band width characterisitic parameter that characterizes affiliated required bandwidth of link of digital filtering module and filtration module, and monitoring module calculates the pass band width characterisitic parameter of filtration module automatically according to the required bandwidth of link and digital filtering module is adjusted.
2, the digital RF far-drawing system of adaptive-bandwidth according to claim 1, it is characterized in that: described far-drawing system comprises a Surveillance center, electrically connect with described each monitoring module, this Surveillance center provides the operation that the pass band width characterisitic parameter of corresponding digital filtration module artificially is set respectively by each monitoring module.
3, the digital RF far-drawing system of adaptive-bandwidth according to claim 1 is characterized in that: described digital filtering module comprises the function sub-modules that the filter submodule electrically connects with it.
4, according to the digital RF far-drawing system of claim 1 or 2 or 3 described adaptive-bandwidths, it is characterized in that: down link and/or up link are equipped with the corresponding simulation of each two cover frequency-variable module, unscented transformation module, the digital frequency conversion module that places respectively in Remote Radio Unit and the Base Band Unit
Two of same link simulation frequency-variable modules, the direction in the radiofrequency signal input downconverts to analog intermediate frequency signal with signal respectively, and in the direction of signal output with the analog intermediate frequency signal up-conversion to radio frequency;
Two unscented transformation modules of same link are respectively digital signal with the analog signal conversion of intermediate frequency and the digital signal of intermediate frequency is converted to analog signal;
Two digital frequency-variable modules of same link down-convert to digital intermediate frequency signal digital baseband signal respectively and send into the baseband processing module of unit and will up-convert to digital intermediate frequency signal through the baseband signal with the baseband processing module output of unit.
5, the digital RF far-drawing system of adaptive-bandwidth according to claim 4, it is characterized in that: in the same link, the base station processing module that is in the baseband processing module of Base Band Unit and is in Remote Radio Unit by light receive/send out a submodule and be that media is looked logical with optical fiber.
6, the digital RF far-drawing system of adaptive-bandwidth according to claim 4 is characterized in that: in described Base Band Unit/Remote Radio Unit, the baseband processing module of up link and down link is integrated by same chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200480761U CN201222807Y (en) | 2008-05-21 | 2008-05-21 | Digital radio frequency zooming system with variable bandwidth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200480761U CN201222807Y (en) | 2008-05-21 | 2008-05-21 | Digital radio frequency zooming system with variable bandwidth |
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| CN201222807Y true CN201222807Y (en) | 2009-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200480761U Expired - Fee Related CN201222807Y (en) | 2008-05-21 | 2008-05-21 | Digital radio frequency zooming system with variable bandwidth |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059819A (en) * | 2016-06-29 | 2016-10-26 | 武汉虹信通信技术有限责任公司 | Method and device for realizing broadband and narrowband switch of digital radio remote system |
| CN109391274A (en) * | 2018-09-25 | 2019-02-26 | 中国联合网络通信集团有限公司 | A kind of data processing method and equipment |
-
2008
- 2008-05-21 CN CNU2008200480761U patent/CN201222807Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059819A (en) * | 2016-06-29 | 2016-10-26 | 武汉虹信通信技术有限责任公司 | Method and device for realizing broadband and narrowband switch of digital radio remote system |
| CN109391274A (en) * | 2018-09-25 | 2019-02-26 | 中国联合网络通信集团有限公司 | A kind of data processing method and equipment |
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Granted publication date: 20090415 Termination date: 20140521 |