CN102377027A - Active antenna and method for calibrating active antenna - Google Patents
Active antenna and method for calibrating active antenna Download PDFInfo
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- CN102377027A CN102377027A CN2010102659049A CN201010265904A CN102377027A CN 102377027 A CN102377027 A CN 102377027A CN 2010102659049 A CN2010102659049 A CN 2010102659049A CN 201010265904 A CN201010265904 A CN 201010265904A CN 102377027 A CN102377027 A CN 102377027A
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Abstract
The embodiment of the invention relates to the technical field of wireless communication, particularly relates to an active antenna and a method for calibrating the active antenna, and is used for solving the problems that the distance between RRU (Radio Remote Unit) and an antenna array is long in the prior art, thus the generated interference is larger and the transmission stability is lower. The active antenna provided by the embodiment of the invention comprises an interface main board, a radio frequency slave board, a filter and the antenna array, wherein the interface main board is used for converting light carrier radio frequency sending signal into electrical level radio frequency sending signal, converting the electrical level radio frequency receiving signal into light carrier radio frequency receiving signal and the outputting; the radio frequency slave board is used for carrying out power amplification on the electrical level radio frequency sending signal and carrying out low-noise amplification on the electrical level radio frequency receiving signal; the filter is used for filtering the electrical level radio frequency sending signal and the electrical level radio frequency receiving signal; and the antenna array is used for sending the electrical level radio frequency sending signal and receiving the electrical level radio frequency receiving signal. The active antenna has the advantages that: the interface main board, radio frequency slave board and antenna array are integrated, thus the data transmission distance and interference are reduced and the anti-interference capability and transmission stability are improved.
Description
Technical field
The present invention relates to wireless communication technology field, the method for particularly a kind of active antenna and calibration active antenna.
Background technology
TD-SCDMA (Time Division Synchronized Code Division Multiple Access; TD SDMA) later stage of industrialization, on the basis that solves conventional radio frequency remote base station drawback, the fiber optic stretch base station is developed and use, and whenever sets up a fibre base, can save 1/3 to 2/3 build a station the time than the feeder line base station.
At present, 3G network uses the distributed base station framework in a large number, need connect with optical fiber between RRU (radio frequency remoto module) and the BBU (baseband processing unit).A BBU can support a plurality of RRU.So-called BBU+RRU, the distributed base station solution of promptly forming by BBU+RRU, it can effectively solve dense urban can't find problems such as available site resource.Through with power amplifier and low noise amplifier, RF transceiver even intermediate frequency unit as remote end module zoom out to the area of coverage away from the base station be the actual needs that mobile communications network is built.Radio frequency zooms out the distance that zooms out that realizes with the intermediate frequency remote technology and is respectively about 100 meters and 300 meters, and baseband extension to be the fiber optic stretch transmission range can reach tens kilometers, can realize that long distance zooms out.These technology can bring that network construction cost is low, the benefit of networking flexibility.
The scheme of the fiber optic stretch RRU that existing 3G (Third Generation) Moblie base station system adopts, the radio frequency scheme that zooms out more early is greatly improved, and is popular design in the present 3G (Third Generation) Moblie network.
Distance in the distributed base station scheme that BBU+RRU forms between RRU and the aerial array is long, needs to receive from the data of aerial array or to aerial array transmission data through the radio frequency cable.Because distance is longer, the interference ratio when making transmission is bigger, has reduced the stability of transmission.
In sum, the distance between RRU and the aerial array is long in the distributed base station scheme at present, thereby the interference ratio that produces is bigger, and the stability of transmission is lower.
Summary of the invention
The embodiment of the invention provides the method for a kind of active antenna and calibration active antenna, and is long in order to the distance between RRU and the aerial array in the solution prior art, thereby the interference ratio that produces is bigger, the problem that the stability of transmission is lower.
A kind of active antenna that the embodiment of the invention provides, this active antenna comprises: interface mainboard, radio frequency slave plate, filter and aerial array
The interface mainboard is used for the light of receiving carried and exports to said radio frequency slave plate after radio frequency transmit signal converts the level radio frequency transmit signal to, the level radio frequency receiving signal of receiving from said radio frequency slave plate is converted to light carries radio frequency receiving signal after optical fiber output;
The radio frequency slave plate; Be used for the power level of the level radio frequency transmit signal of receiving is amplified; And the level radio frequency transmit signal after level amplified carries out exporting to said filter after power amplification is handled; The level radio frequency receiving signal of receiving from said filter is carried out the low noise processing and amplifying, and the power level that will carry out the level radio frequency receiving signal after the low noise processing and amplifying is amplified back output;
Filter be used for the level radio frequency transmit signal of receiving is carried out filtering after aerial array sends, and the level radio frequency receiving signal from aerial array that will receive is exported after filtering;
Aerial array is used for the transmission level radio frequency transmit signal, and the incoming level radio frequency receiving signal.
A kind of method of calibrating the active antenna of the embodiment of the invention that the embodiment of the invention provides, this method comprises:
From two RF calibration passages, confirm main RF calibration passage and from the RF calibration passage;
Through said main RF calibration passage the antenna in the said active antenna is calibrated.
Owing to interface mainboard, radio frequency slave plate and aerial array are integrated in one, thereby have reduced the distance of transfer of data, reduced interference, improved the stable of antijamming capability and transmission.
Description of drawings
Fig. 1 is the structural representation of embodiment of the invention active antenna;
Fig. 2 is the scheme sketch map of embodiment of the invention simulation ROF active antenna;
Fig. 3 is the scheme sketch map of embodiment of the invention numeral ROF active antenna;
Fig. 4 supports the structural representation of ROF active antenna for the embodiment of the invention;
Fig. 5 is embodiment of the invention TDD standard radio frequency slave plate and filter circuit block diagram;
Fig. 6 is embodiment of the invention FDD standard radio frequency slave plate and filter circuit block diagram;
Fig. 7 is an embodiment of the invention antenna calibration method flow chart;
Fig. 8 is an embodiment of the invention antenna calibration sketch map.
Embodiment
The embodiment of the invention is integrated in one with interface mainboard, radio frequency slave plate and aerial array, has cancelled RUU, makes BBU directly be connected with active antenna, has reduced the distance of transfer of data, thereby has reduced interference, has improved the stable of antijamming capability and transmission.
Below in conjunction with Figure of description the embodiment of the invention is described in further detail.
As shown in Figure 1, the active antenna of the embodiment of the invention comprises: interface mainboard 10, radio frequency slave plate 20, filter 30 and aerial array 40.
Radio frequency slave plate 20; The power level from the level radio frequency transmit signal of interface mainboard 10 that is used for receiving is amplified; And the level radio frequency transmit signal after level amplified carries out exporting to filter 30 after power amplification is handled; The level radio frequency receiving signal of receiving from filter 30 is carried out the low noise processing and amplifying, and the power level that will carry out the level radio frequency receiving signal after the low noise processing and amplifying is exported to interface mainboard 10 after amplifying.
The filter 30 of the embodiment of the invention is accomplished and is reduced transmit scattering and the effect that suppresses to block, and can be installed on the antenna array back side, can change according to the different scene needs.Under the frequency resource that broad-band antenna covers, filter 30 can become identical structure and interface according to the frequency configuration of different system, thereby is convenient for changing.
Wherein, the active antenna of the embodiment of the invention can further include: power module 50.
The power module 50 of the embodiment of the invention can be according to the different scene needs AC that provides support, DC input, and the capacity that different electrical power power is provided.Power module 50 can be installed on the antenna array back side, and can change according to the different scene needs.
Concrete, interface mainboard 10 sends digital controlled signal to radio frequency slave plate 20, and the mains switch in the control radio frequency slave plate 20 is opened or is closed.
Preferable, interface mainboard 10 is confirmed to send according to preset time adjustment amount and is used to open or time of the digital controlled signal of powered-down, like this can be when non operating state powered-down, thereby reach the purpose that reduces power consumption.
For the different frequency that adapts to different system covers, the radio frequency bandwidth of embodiment of the invention interface mainboard 10 can adopt wideband modulated laser assembly and wideband photelectric receiver assembly, covers the frequency of 1.8～2.6G at least.In each 3G frequency all covers, can effectively utilize same interface mainboard 10 to cover multiband, adopt compatible multiple systems on the structure, can change mainboard, make the expansibility of active antenna stronger according to the various network demand.
Such as can support digital ROF (Radioover fiber, light carries radio frequency) or simulation ROF according to the active antenna of system's needs embodiment of the invention.Accordingly, digital ROF or simulation ROF be can support, more alias mainboard 10 and radio frequency slave plate 20 just needed in order to make active antenna.
As shown in Figure 2, in the scheme sketch map of embodiment of the invention simulation ROF active antenna, interface mainboard 10 is analog interface mainboards, and the analog interface mainboard comprises circuit board and is inserted in first digital control module 100 and ROF photoelectric conversion module 110 on the circuit board.
First digital control module 100 is used for according to the electric power starting of digital controlled signal control radio frequency slave plate or closes.
ROF photoelectric conversion module 110; The light that is used for receiving carries exports to radio frequency slave plate 20 after radio frequency transmit signal converts the level radio frequency transmit signal to, converts the level radio frequency receiving signal of receiving from radio frequency slave plate 20 to light carry radio frequency receiving signal after optical fiber output.
Owing to, need join with a plurality of optical interface levels and could satisfy the demand of data service, thereby increase use cost and engineering complexity at present owing to the restriction of the IR interface light-receiving mouth module data rate between BBU and the RRU.The simulation ROF active antenna of the embodiment of the invention, because simulation ROF active antenna can carry more bandwidth, thus do not need a plurality of optical interface levels to join the demand that just can satisfy data service, thus little cost and engineering complexity.
As shown in Figure 3; In the scheme sketch map of embodiment of the invention numeral ROF active antenna; Interface mainboard 10 is digital interface mainboards, and the analog interface mainboard comprises circuit board and is inserted in second digital control module 150, fiber interface module 160 and the digital intermediate frequency module 170 on the circuit board.
Second digital control module 150 is used for according to the electric power starting of digital controlled signal control radio frequency slave plate or closes.
Fiber interface module 160 is used for sending light through optical fiber link and carries radio frequency receiving signal, and carries radio frequency transmit signal through optical fiber link reception light.
Digital intermediate frequency module 170; Be used for the light that fiber interface module 160 is received carried and export to radio frequency slave plate 20 after radio frequency transmit signal converts the level radio frequency transmit signal to, the level radio frequency receiving signal of receiving from radio frequency slave plate 20 is converted to export to fiber interface module 160 after light carries radio frequency receiving signal.
From Fig. 2 and Fig. 3, can find out: specifically support digital ROF and support that the modular structure of the radio frequency slave plate of simulation ROF has no different, all comprise circuit board and be inserted in wide band radio-frequency Transceiver Module 200, power amplifier module 210 and the LNA module 220 on the circuit board.
Wherein, Wide band radio-frequency Transceiver Module 200; Export to power amplifier module 210 after being used for the power level of receiving from the level radio frequency transmit signal of interface mainboard 10 amplified, with receive from LNA module 220 the power level of level radio frequency receiving signal export to interface mainboard 10 after amplifying.
LNA module 220 is used for the level radio frequency receiving signal of receiving from filter 30 is carried out exporting to wide band radio-frequency Transceiver Module 200 after the low noise processing and amplifying.
Because embodiment of the invention active antenna can be simulation ROF active antenna or digital ROF active antenna, specifically adopts which kind of active antenna to confirm as required.
Can find out from Fig. 2 and Fig. 3:, just can active antenna be become simulation ROF active antenna or digital ROF active antenna through more alias mainboard and radio frequency slave plate.A kind of preferable mode is that interface mainboard and radio frequency slave plate are made of one, and is convenient to like this change.Specifically as shown in Figure 4; The embodiment of the invention is supported in the ROF active antenna structure chart; The interface mainboard is positioned at radio frequency slave plate centre position; Antennal interface is arranged respectively in the upper and lower, and so only need antenna be inserted antennal interface just can place active antenna with interface mainboard and radio frequency slave plate, changes also very convenient.
In the practical implementation process; The radio frequency slave plate of the embodiment of the invention can be TDD (Time divisionduplex; Time division duplex) the radio frequency slave plate of the radio frequency slave plate of standard or FDD (Frequency Division Duplex, FDD) standard, concrete circuit block diagram is referring to Fig. 5 and Fig. 6.
As shown in Figure 5; In embodiment of the invention TDD standard radio frequency slave plate and the filter circuit block diagram; To the quantity of passage (being antenna), confirm the component number that needs in wide band radio-frequency Transceiver Module 200, power amplifier module 210, LNA module 220 and the filter 30.
Supposing has 4 antennas, i.e. four-ways in the aerial array 40.All need comprise the components and parts that each passage is corresponding in wide band radio-frequency Transceiver Module 200, power amplifier module 210, LNA module 220 and the filter 30.
Concrete, to each passage, comprise the emission driving amplifier in the wide band radio-frequency Transceiver Module 200, receive driving amplifier and frequency mixer; Comprise power amplifier and circulator in the power amplifier module 210; Comprise low noise amplifier and switch in the LNA module 220; Comprise filtration module in the filter 30.
Wherein, the emission driving amplifier is used for: the radiofrequency signal of emission is carried out power level amplify;
The reception driving amplifier is used for: the radiofrequency signal to receiving is amplified;
Frequency mixer is used for: signal is carried out down-converted, high-frequency signal is converted to intermediate frequency, make signal can carry out Digital IF Processing;
Power amplifier is used for: radiofrequency signal is amplified once more;
Circulator; The protection low noise amplifier makes large-signal pass through circulator and directly sends out to antenna, and directly gets into switch and LNA from the signal that antenna receives through circulator;
Low noise amplifier is used for level radio frequency transmit signal and level radio frequency receiving signal are carried out the low noise processing and amplifying;
The interface mainboard is opened or is closed through the digital controlled signal control switch, thus the power supply of control radio frequency slave plate 20.
As shown in Figure 6; In embodiment of the invention FDD standard radio frequency slave plate circuit and the filter block diagram; To the quantity of passage (being antenna), confirm the component number that needs in wide band radio-frequency Transceiver Module 200, power amplifier module 210, LNA module 220 and the filter 30.
Supposing has 4 antennas, i.e. four-ways in the aerial array 40.All need comprise the components and parts that each passage is corresponding in wide band radio-frequency Transceiver Module 200, power amplifier module 210, LNA module 220 and the filter 30.
Concrete, to each passage, comprise power level amplifier and driving amplifier in the wide band radio-frequency Transceiver Module 200; Comprise power amplifier in the power amplifier module 210; Comprise low noise amplifier and frequency mixer in the LNA module 220; Comprise duplexer in the filter 30.
Wherein, The function of power level amplifier, driving amplifier, frequency mixer, power amplifier and low noise amplifier among power level amplifier, driving amplifier, frequency mixer, power amplifier and the low noise amplifier among Fig. 6 and Fig. 5 is identical; The function of the filter module among the duplexer among Fig. 6 and Fig. 5 is identical, repeats no more at this.
Wherein, the radio frequency slave plate of the embodiment of the invention can be a kind of in four-way TDD standard radio frequency slave plate, eight passage TDD standard radio frequency slave plates, four-way FDD standard radio frequency slave plate and the eight passage FDD standard radio frequency slave plates.
What Fig. 5 and 6 provided is four-way radio frequency slave plate, if 8 passages among eight passage radio frequency slave plate Fig. 5 and Fig. 6 double
To the active antenna among Fig. 1, the embodiment of the invention also has a kind of brand-new antenna calibration method.
As shown in Figure 7, the method for embodiment of the invention antenna calibration comprises the following steps:
Concrete, transmit by normal channel, calibrated channel receives, and judges according to the signal that receives whether normal channel is normal, in judged result when being undesired, the gain setting of change normal channel internal emission link; Received by normal channel, calibrated channel transmits, and judges according to the signal that receives whether normal channel is normal, when being undesired, changes the gain setting of the inner reception of normal channel link in judged result.
In force, after main RF calibration passage damages, through the antenna the active antenna being calibrated from the RF calibration passage.
Because variation has taken place in the active antenna structure of the embodiment of the invention, thereby has two RF calibration passages to use.Compare with the scheme of present antenna calibration; The antenna calibration scheme of the embodiment of the invention has two RF calibration passages, damages at a RF calibration passage, causes can carrying out antenna calibration with another radio-frequency channel after the system failure; The system that makes can in time recover from fault; And do not need artificial last station just can deal with problems, saved resource and time, practiced thrift great amount of manpower and material resources.
As shown in Figure 8, in the embodiment of the invention antenna calibration sketch map, ACAL (A RF calibration passage) and BCAL (B RF calibration passage) are respectively two RF calibration passages, and each RF calibration passage all is connected with the interface of radio frequency slave plate.
Preferable, radio frequency slave plate and filter module being made identical module (referring to Fig. 4), can avoid like this because of having only a calibrated channel to cause radio frequency slave plate and filter module will make different module in the background technology.
From the foregoing description, can find out: the active antenna of the embodiment of the invention comprises: interface mainboard, radio frequency slave plate, filter and aerial array interface mainboard; The light that is used for receiving carries exports to the radio frequency slave plate after radio frequency transmit signal converts the level radio frequency transmit signal to, converts the level radio frequency receiving signal of receiving from the radio frequency slave plate to light carry radio frequency receiving signal after optical fiber output; The radio frequency slave plate; Be used for the power level of the level radio frequency transmit signal of receiving is amplified; And the level radio frequency transmit signal after level amplified carries out exporting to filter after power amplification is handled; The level radio frequency receiving signal of receiving from filter is carried out the low noise processing and amplifying, and the power level that will carry out the level radio frequency receiving signal after the low noise processing and amplifying is amplified back output; Filter be used for the level radio frequency transmit signal of receiving is carried out filtering after aerial array sends, and the level radio frequency receiving signal from aerial array that will receive is exported after filtering; Aerial array is used for the transmission level radio frequency transmit signal, and the incoming level radio frequency receiving signal.
Owing to interface mainboard, radio frequency slave plate and aerial array are integrated in one, thereby have reduced the distance of transfer of data, reduced interference, improved the stable of antijamming capability and transmission.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. an active antenna is characterized in that, this active antenna comprises: interface mainboard, radio frequency slave plate, filter and aerial array
The interface mainboard is used for the light of receiving carried and exports to said radio frequency slave plate after radio frequency transmit signal converts the level radio frequency transmit signal to, the level radio frequency receiving signal of receiving from said radio frequency slave plate is converted to light carries radio frequency receiving signal after optical fiber output;
The radio frequency slave plate; Be used for the power level of the level radio frequency transmit signal of receiving is amplified; And the level radio frequency transmit signal after level amplified carries out exporting to said filter after power amplification is handled; The level radio frequency receiving signal of receiving from said filter is carried out the low noise processing and amplifying, and the power level that will carry out the level radio frequency receiving signal after the low noise processing and amplifying is amplified back output;
Filter be used for the level radio frequency transmit signal of receiving is carried out filtering after aerial array sends, and the level radio frequency receiving signal from aerial array that will receive is exported after filtering;
Aerial array is used for the transmission level radio frequency transmit signal, and the incoming level radio frequency receiving signal.
2. active antenna as claimed in claim 1 is characterized in that, said radio frequency slave plate comprises circuit board and is inserted in wide band radio-frequency Transceiver Module, power amplifier module and the LNA module on the said circuit board;
Said wide band radio-frequency Transceiver Module is used for the level radio frequency transmit signal received and the power level of carrying out the level radio frequency receiving signal after the low noise processing and amplifying are amplified;
Said power amplifier module is used for the said level radio frequency transmit signal of receiving is carried out exporting to said filter after power amplification is handled;
Said LNA module is used for the level radio frequency receiving signal of receiving from said filter is carried out exporting after the low noise processing and amplifying.
3. active antenna as claimed in claim 1 is characterized in that, said interface mainboard also is used for: control the electric power starting of said radio frequency slave plate or close through digital controlled signal.
4. active antenna as claimed in claim 3 is characterized in that, said interface mainboard is the analog interface mainboard, and said analog interface mainboard comprises circuit board and is inserted in first digital control module and the ROF photoelectric conversion module on the said circuit board;
Said first digital control module is used for controlling the electric power starting of said radio frequency slave plate or closing according to digital controlled signal;
Said ROF photoelectric conversion module; The light that is used for receiving carries exports to said radio frequency slave plate after radio frequency transmit signal converts the level radio frequency transmit signal to, converts the level radio frequency receiving signal of receiving from said radio frequency slave plate to light carry radio frequency receiving signal after optical fiber output.
5. active antenna as claimed in claim 3; It is characterized in that; Said interface mainboard is the digital interface mainboard, and said analog interface mainboard comprises circuit board and is inserted in second digital control module, fiber interface module and the digital intermediate frequency module on the said circuit board;
Said second digital control module is used for controlling the electric power starting of said radio frequency slave plate or closing according to digital controlled signal;
Said fiber interface module is used for sending light through optical fiber link and carries radio frequency receiving signal, and carries radio frequency transmit signal through optical fiber link reception light;
Said digital intermediate frequency module; Be used for the light that said fiber interface module is received carried and export to said radio frequency slave plate after radio frequency transmit signal converts the level radio frequency transmit signal to, the level radio frequency receiving signal of receiving from said radio frequency slave plate is converted to export to said fiber interface module after light carries radio frequency receiving signal.
6. active antenna as claimed in claim 3 is characterized in that, said interface mainboard specifically is used for:
Confirm to send according to preset time adjustment amount and be used to open or time of the digital controlled signal of powered-down.
7. active antenna as claimed in claim 1 is characterized in that, said active antenna also comprises:
Power module is used to said interface mainboard and said radio frequency slave plate provides power supply.
8. active antenna as claimed in claim 1; It is characterized in that said radio frequency slave plate is a kind of in four-way TDD standard radio frequency slave plate, eight passage TDD standard radio frequency slave plates, four-way FDD standard radio frequency slave plate and the eight passage FDD standard radio frequency slave plates.
9. a method of calibrating the active antenna of claim 1 is characterized in that, this method comprises:
From two RF calibration passages, confirm main RF calibration passage and from the RF calibration passage;
Through said main RF calibration passage the antenna in the said active antenna is calibrated.
10. method as claimed in claim 9 is characterized in that, this method also comprises:
After said main RF calibration passage damages, from the RF calibration passage antenna the said active antenna is calibrated through said.
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| CN103236587A (en) * | 2013-04-10 | 2013-08-07 | 东南大学 | RoF (radio over fiber) phased active integral antenna applicable to FDD (frequency division duplexing) system |
| CN103997352A (en) * | 2014-05-14 | 2014-08-20 | 电信科学技术研究院 | Active antenna related equipment, system and method for transmitting and receiving calibration |
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