CN102664681A - Radio-over-fiber switching system - Google Patents
Radio-over-fiber switching system Download PDFInfo
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- CN102664681A CN102664681A CN2012101119767A CN201210111976A CN102664681A CN 102664681 A CN102664681 A CN 102664681A CN 2012101119767 A CN2012101119767 A CN 2012101119767A CN 201210111976 A CN201210111976 A CN 201210111976A CN 102664681 A CN102664681 A CN 102664681A
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Abstract
A radio-over-fiber switching system comprises a radio-over-fiber switch, remote radiofrequency units, analog optical fiber circuits and radiating antennas, signals are transmitted between radio-over-fiber switch and the remote radiofrequency units by the analog optical fiber circuits, and the radiating antennas are connected with the remote radiofrequency units. The radio-over-fiber switch consists of at least four WiFi (wireless fidelity) access points, time division duplex units, radiofrequency switch units, at least two electronic-to-optical conversion units, optical switch units and a control circuit, the WiFi access points are used for receiving and transmitting WiFi radiofrequency signals, the time division duplex units are used for receiving, transmitting and separating the WiFi radiofrequency signals which are transmitted from or to the WiFi access points, the radiofrequency switch units are used for switching and distributing the WiFi radiofrequency signals, the electronic-to-optical conversion units are used for converting the WiFi radiofrequency signals from the radiofrequency switch units into optical signals, the optical switch units are used for switching and distributing the optical signals, and the control circuit is used for controlling at least two photoelectric conversion units which are used for converting the optical signals from the optical switch units into WiFi radiofrequency signals and controlling the radiofrequency switch units and the optical switch units.
Description
[technical field]
The present invention relates to a kind of light-carried wireless switching system.
[technical background]
At present, the WiFi WLAN is just more and more universal, has become the preferred option of setting up WLAN.But the signal cover of common WiFi access point is: indoorly be approximately 50～100 meters; Outdoorly be approximately 100～150 meters.
In order to enlarge the coverage of WiFi signal, the main method that industry is taked at present comprises: the radiant power that strengthens WiFi equipment.
Yet; Radiant power to strengthening WiFi equipment has certain drawback; Because WiFi equipment adopts the ISM working frequency range, this working frequency range itself has limited the increase of radiant power, and therefore the method for the radiant power of employing increasing WiFi equipment, expansion WiFi signal cover is worth choosing.
Simultaneously, in the cloth network method of prior art, the message capacity of far-end access point immobilizes, and therefore is not easy to the allotment and the reconstruct of message capacity.
[summary of the invention]
The object of the present invention is to provide a kind of light-carried wireless switching system; This system has merged radio frequency exchange technology, optic fibre subcarrier multiplex technique, light-carried wireless power technology and light switching technology dexterously; Realize route, distribution and the remote fiber distribution of WiFi radiofrequency signal, thereby realized the intellectuality of WiFi signal, reach the high distribution of flexibility on a large scale.
For realizing this purpose, the present invention adopts following technical scheme:
A kind of light-carried wireless switching system comprises: light-carried wireless switch, remote radio unit (RRU), be used between light-carried wireless switch and remote radio unit (RRU), transmitting the analog optic fiber line of signal and the radiating antenna that is connected with remote radio unit (RRU).The light-carried wireless switch comprises: at least four WiFi access points that are used to receive and dispatch the WiFi radiofrequency signal; Be used for receiving and dispatching the time division duplex unit of separation from WiFi access point or the WiFi radiofrequency signal that sends to the WiFi access point; Be used for radio frequency exchange unit that the WiFi radiofrequency signal is exchanged and distributes; Be used for to change into from the WiFi radiofrequency signal of radio frequency exchange unit at least two electrooptic switching elements of light signal; Be used for light crosspoint that above-mentioned light signal is exchanged and distributes; The control circuit that is used for to change at least two photoelectric conversion units of WiFi radiofrequency signal into from the light signal of light crosspoint and is used for radio frequency crosspoint and light crosspoint are controlled.
Compared with prior art, the present invention has following advantage:
Owing in light-carried wireless switching system of the present invention, adopted optic fibre subcarrier multiplex technique, light-carried wireless power technology, radio frequency exchange technology and light switching technology, therefore realized the fairly large exchange and the route of WiFi radiofrequency signal; Simultaneously because the remote radio unit (RRU) among the present invention adopts two-way down going channel and two-way data feedback channel and sending and receiving antenna separated structures, thereby the mixed transport of radiofrequency signal and the reconstruct of far-end wireless signal capacity have been realized.
[description of drawings]
Fig. 1 is the structured flowchart of light-carried wireless switching system according to an embodiment of the invention;
Fig. 2 is the structured flowchart of the time division duplex unit of light-carried wireless switching system shown in Figure 1;
Fig. 3 is the structured flowchart of the radio frequency exchange unit of light-carried wireless switching system shown in Figure 1;
Fig. 4 is the structured flowchart of the light crosspoint of light-carried wireless switching system shown in Figure 1; And
Fig. 5 is the structured flowchart of the remote radio unit (RRU) of light-carried wireless switching system shown in Figure 1.
[embodiment]
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
With reference to figure 1; According to one embodiment of present invention, a kind of light-carried wireless switching system comprises: light-carried wireless switch 100, remote radio unit (RRU) 130, be used between light-carried wireless switch 100 and remote radio unit (RRU) 130, transmitting the analog optic fiber line 120 of signal and the radiating antenna 140 that is connected with remote radio unit (RRU) 130.
Said light-carried wireless switch 100 comprises: at least four WiFi access point 101A-101D that are used to receive and dispatch the WiFi radiofrequency signal; Be used for receiving and dispatching the time division duplex unit 102 of separation from WiFi access point 101A-101D or the WiFi radiofrequency signal that sends to WiFi access point 101A-101D; Be used for radio frequency exchange unit 1031 that the WiFi radiofrequency signal is exchanged and distributes; Be used for to change into from the WiFi radiofrequency signal of radio frequency exchange unit 1031 at least two electrooptic switching elements 1051 of light signal; Be used for light crosspoint 1071 that above-mentioned light signal is exchanged and distributes; The control circuit 110 that is used for to change at least two photoelectric conversion units 1041 of WiFi radiofrequency signal into from the light signal of light crosspoint 1071 and is used for said radio frequency exchange unit 1031 and light crosspoint 1071 are controlled.
Preferably, said photoelectric conversion unit 1041, electrooptic switching element 1051 all are connected with said smooth crosspoint 1071 through connection line of optic fibre 106.
Fig. 2 illustrates the detailed block diagram of time division duplex unit 102 of the light-carried wireless switch of exemplary embodiment of the present invention.As shown in the figure, time division duplex unit 102 is used to realize that the transmitting-receiving of WiFi radiofrequency signal separates.See that from general structure said time division duplex unit 102 is three port units, comprise transmitting-receiving port Cx, emission port Tx and receiving port Rx.
Particularly, said time division duplex unit 102 comprise be used to survey transmitting-receiving port Cx transmit and produce tempolabile signal radio-frequency power detection circuit 201, be used for to above-mentioned tempolabile signal carry out shaping shaping circuit 202, be used to receive the signal of said shaping circuit 202 outputs and produce the switching tube drive circuit 203 of two groups of reverse control signals, the first group of switching tube (forming) that is used to receive the respective opposed control signal, second group of switching tube (forming) and and said two groups of switching tubes, receive and dispatch closing/splitter 204 that port Cx, emission port Tx and receiving port Rx all electrically connect by switching tube Q4, Q5, Q6 by switching tube Q1, Q2, Q3.
Wherein, said radio-frequency power detection circuit 201 directional detections transmit.When not having signal transmitting and receiving, switching tube Q2 disconnection, switching tube Q1 and Q3 are closed, and transmitting-receiving port Cx and emission port Tx break off, and switching tube Q5 closure, switching tube Q4 and Q6 break off simultaneously, and transmitting-receiving port Cx and receiving port Rx connect;
When receiving signal; Switching tube Q2 disconnection, switching tube Q1 and Q3 are closed, and transmitting-receiving port Cx and emission port Tx break off, and switching tube Q5 closure, switching tube Q4 and Q6 break off simultaneously; Transmitting-receiving port Cx and receiving port Rx connect, and receiving port Rx receives signal and warp transmitting-receiving port Cx output;
When transmitting-receiving port Cx transmitted, radio-frequency power detection circuit 201 detected and transmits, and produces tempolabile signal; Through shaping circuit 202 shapings; And, control said two groups of switching tubes respectively through two reverse control signals of switching tube drive circuit 203 generations, switching tube Q2 closure, switching tube Q1 and Q3 are broken off; Make switching tube Q5 disconnection, switching tube Q4 and Q6 closed simultaneously; Transmitting-receiving port Cx and emission port Tx connect, and transmitting-receiving port Cx and receiving port Rx break off, and transmit by the output of emission port Tx end.
Fig. 3 illustrates the block diagram of the radio frequency exchange unit 1031 of the light-carried wireless switch in the exemplary embodiment of the present invention.
Radio frequency exchange unit 1031 is used to realize the exchange and the distribution of radiofrequency signal.Radio frequency exchange unit 1031 is four port devices, and wherein two ports are that input 301 and 302, two ports are output 303 and 304.
Each radio frequency exchange unit 1031 comprises two splitters 310, two mixers 330 and is used to realize the RF switch 320 of the break-make between splitter 310 and the mixer 330.
The radiofrequency signal of any one input 301,302 can be under the control of RF switch 320 such as radiofrequency signal f1; From an any output 303,304 outputs; Or simultaneously from two outputs 303 and 304 outputs, or not from any one output output.
Equally, any output 303,304 can be exported the radiofrequency signal of any input 301,302, or exports the radiofrequency signal of two inputs simultaneously, or does not export the signal of any input.2 * 2 exchanges entirely of two-way radiofrequency signal are realized in above-mentioned radio frequency exchange unit 1031.
Fig. 4 illustrates the system block diagram of the light crosspoint of the light-carried wireless switch in the exemplary embodiment of the present invention.
The light signal of any one light input end mouth 401,402 can from an any optical output port 403,404 outputs, or be exported from two optical output ports 403 and 404, or not export under the control of optical switch group 420 simultaneously.
Equally, any optical output port 403 and 404 can be exported the light signal of any light input end mouth 401,402, or exports the light signal of two light input end mouths 401 and 402 simultaneously, or does not export any light signal.Said smooth crosspoint is realized 2 * 2 exchanges entirely of two ways of optical signals.
With reference to figure 5, said each remote radio unit (RRU) 130 comprises: optical branching filter 503, optical multiplexer 504, two photoelectric conversion units 505 that are connected through optical fiber with optical branching filter 503, two electrooptic switching elements 506 that are connected through optical fiber with optical multiplexer 504, be used for two radio-frequency power amplifiers 507 that the signal to said two photoelectric conversion units, 505 outputs amplifies, two low noise amplifiers 508 electrically connecting with said two electrooptic switching elements 506, the transmitting antenna 510,512 that electrically connects with corresponding radio-frequency power amplifier respectively and the reception antenna 511,513 that electrically connects with corresponding low noise amplifier 508 respectively.
Remote radio unit (RRU) 130 realizes that the downlink optical signal of light-carried wireless switch 100 converts rf signal and radiofrequency signal power amplification into, and radiate through transmitting antenna; Simultaneously, receive up rf signal through reception antenna 511,513, and convert light signal into, be uploaded to the up input port of light-carried wireless switch 100 through analog optic fiber line 120.
Remote radio unit (RRU) 130 is made up of two-way down going channel and two-way data feedback channel, can handle the downlink optical signal of two wavelength simultaneously and upload the light signal of two wavelength simultaneously.
The light signal that carries two wavelength is through fiber port 501; Separate by optical branching filter 503; Convert radiofrequency signal into by two-way photoelectric conversion unit 505 respectively; Amplify by two-way radio-frequency power amplifier 507 then, radiate from transmitting antenna radiation 510,512 respectively, thus the down going channel of formation remote radio unit (RRU) 130.
Radiofrequency signal through two- way reception antenna 511 and 513 receptions; Amplify through two-way low noise amplifier 508 respectively; Convert wavelength optical signals (like λ 3 and λ 7) to by two-way electrooptic switching element 506 then, at last after wave multiplexer 504 mixes, through fiber port 502; Upload to light-carried wireless switch 100 by optical fiber, thereby constitute the data feedback channel of remote radio unit (RRU) 130.
The two-way data feedback channel of remote radio unit (RRU) 130 uses two electrooptic switching elements to accomplish the conversion of rf signal to light signal, and the laser of electrooptic switching element uses two groups of wavelength among the present invention: λ 3=1511nm, λ 7=1591nm and λ 4=1531nm, λ 8=1611nm;
Remote radio unit (RRU) 130 is designed to two groups of radiating antennas, and every group of transmitting antenna and reception antenna by separation constitutes, and accomplishes the transmitting-receiving of a channel signal.
Sending and receiving antenna separated structures of the present invention is convenient to realize the mixed transport of radiofrequency signal and the reconstruct of far-end wireless signal capacity.
Preferably, said analog optic fiber line 120 is the monomode fiber circuit, and its operation wavelength is 1550nm.
Said light-carried wireless switch 100, analog optic fiber line 120 and remote radio unit (RRU) 130 constitute complete light-carried wireless system, realize the exchange and distribution and remote distribution of WiFi radiofrequency signal.Describe the operation principle of light-carried wireless system below in detail.
The signal of any WiFi access point 101A-101D in the light-carried wireless switch 100 can exchange through radio frequency exchange and light, is distributed to any or any two or any three or four in four remote radio unit (RRU)s 130 or does not distribute; Same each remote radio unit (RRU) 130 can one, two, three of radiation, or the signal of four WiFi access points, perhaps non-radiating signal.
With WiFi access point 101A is example: the signal of WiFi access point 101A separates into the sending and receiving two-way through corresponding time division duplex unit 102, and lets transmit end and receive signal end and all insert each self-corresponding radio frequency exchange unit 1031.Under the control of control circuit 110, the radiofrequency signal of WiFi access point 101A and 101B realizes exchange, combination through said radio frequency exchange unit 1031.As shown in Figure 3, any one road input radio frequency signal can be from any one road output 303,304 output, and same any one road output 303,304 can export one the road or the two-way radiofrequency signal.One of them radio frequency exchange unit 1031 connects electrooptic switching element 1051, and another radio frequency exchange unit 1031 then connects photoelectric conversion unit 1041.Electrooptic switching element 1051 is modulated at downlink radio-frequency signal on wavelength X 1 and the λ 2; The wavelength that inserts the light signal of photoelectric conversion unit 1041 is λ 3 and λ 4.Wherein λ 1 is one group with λ 3, transmits the downstream signal and the upward signal of cochannel (can be any one among WiFi access point 101A, the 101B, also can be the road of closing of WiFi access point 101A and 101B) respectively.λ 2 and λ 4 are one group, transmit the downstream signal and the upward signal of cochannel respectively.λ 1 and λ 3 get into two light crosspoints 1071 of the upper half among Fig. 1 respectively; λ 2 and λ 4 get into two light crosspoints 1071 of bottom half respectively; Exchange and combination through light crosspoint 1071; Under the control of control circuit 110, wavelength X 1 can radiate from two remote radio unit (RRU)s 130 of upper half with the WiFi radiofrequency signal that λ 3 carries, and covers respective regions; Wavelength X 2 then can radiate from two remote radio unit (RRU)s 130 of bottom half with the WiFi radiofrequency signal that λ 4 carries, and covers respective regions.The signal of WiFi access point 101A can be distributed to any remote radio unit (RRU) 130, the wireless coverage corresponding region under the control of control circuit 110 like this.
The signal distributions principle of WiFi access point 101B-101D is identical, therefore will no longer be repeated in this description it at this, so that practice thrift length.
Light-carried wireless switch 100 in the exemplary embodiment of the present invention uses two-way electrooptic switching element 1051; Totally four electrooptic conversion modules, the operation wavelength of the laser of four electrooptic conversion modules is divided into λ 1=1471nm, λ 2=1491nm, λ 5=1551nm, λ 6=1571nm.
Control circuit 110 in the exemplary embodiment of the present invention adopts the general-purpose computations machine circuit, and is equipped with control corresponding software.
Generally; Exemplary embodiment of the present invention provides a kind of light-carried wireless switching system that merges radio frequency exchange technology, optic fibre subcarrier multiplex technique, light-carried wireless power technology and light switching technology in one, realizes route, distribution and the fiber distribution of WiFi radiofrequency signal effectively.
4 tunnel independently route, distribution and the fiber distribution of WiFi radiofrequency signal have been realized in the exemplary embodiment of the present invention.When needs are handled than the multichannel signal, can extensive radio frequency crosspoint and light crosspoint, the exchange and the fiber distribution of realization multi-channel rf signal.
4 tunnel radiofrequency signals in the exemplary embodiment of the present invention are the WiFi radiofrequency signal, also can insert 2G, 3G and 4G mobile communication signal, realize mixing route, exchange and the fiber distribution of WiFi, 2G, 3G and 4G signal.
The optical wavelength of using in the exemplary embodiment of the present invention also can be used other standard wave lengths as 8 wavelength of 1471～1611nm of CWDM (CWDM) standard.
Above embodiment only in order to the explanation the present invention and and unrestricted technical scheme described in the invention; Therefore, although this specification has carried out detailed explanation to the present invention with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention; And all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1. light-carried wireless switching system; Comprise: light-carried wireless switch, remote radio unit (RRU), be used between light-carried wireless switch and remote radio unit (RRU), transmitting the analog optic fiber line of signal and the radiating antenna that is connected with remote radio unit (RRU), it is characterized in that:
Said light-carried wireless switch comprises: at least four WiFi access points that are used to receive and dispatch the WiFi radiofrequency signal; Be used for receiving and dispatching the time division duplex unit of separation from WiFi access point or the WiFi radiofrequency signal that sends to the WiFi access point; Be used for radio frequency exchange unit that the WiFi radiofrequency signal is exchanged and distributes; Be used for to change into from the WiFi radiofrequency signal of radio frequency exchange unit at least two electrooptic switching elements of light signal; Be used for light crosspoint that above-mentioned light signal is exchanged and distributes; The control circuit that is used for to change at least two photoelectric conversion units of WiFi radiofrequency signal into from the light signal of light crosspoint and is used for said radio frequency exchange unit and light crosspoint are controlled.
2. light-carried wireless switching system according to claim 1 is characterized in that: said photoelectric conversion unit, electrooptic switching element all are connected with said smooth crosspoint through connection line of optic fibre.
3. light-carried wireless switching system according to claim 1 is characterized in that: said time division duplex unit comprises sending and receiving end mouth, emission port, receiving port, be used to survey the transmitting-receiving port transmit and produce tempolabile signal the radio-frequency power detection circuit, be used for to tempolabile signal carry out shaping shaping circuit, be used to the switching tube drive circuit that receives the signal of said shaping circuit output and produce two groups of reverse control signals, the first group of switching tube that is used to receive the respective opposed control signal, second group of switching tube and close/splitter with said two groups of switching tubes, transmitting-receiving port, emission port and receiving port all electrically connect.
4. light-carried wireless switching system according to claim 3 is characterized in that: said first group of switching tube is made up of three switching tubes; Said second group of switching tube also is made up of three switching tubes.
5. light-carried wireless switching system according to claim 4 is characterized in that: said radio frequency exchange unit comprises two splitters, two mixers and is used to realize the RF switch of the break-make between splitter and the mixer.
6. light-carried wireless switching system according to claim 5 is characterized in that: said smooth crosspoint comprises two and closes/channel-splitting filter, two wavelength division multiplexers and be used to realize two and close/channel-splitting filter and two wavelength division multiplexers between the optical switch group of break-make.
7. light-carried wireless switching system according to claim 6 is characterized in that: said each remote radio unit (RRU) comprises: optical branching filter, optical multiplexer/demultiplexer, two photoelectric conversion units that are connected through optical fiber with optical branching filter, two electrooptic switching elements that are connected through optical fiber with optical multiplexer, be used for two radio-frequency power amplifiers that the signal to said two photoelectric conversion units output amplifies, two low noise amplifiers electrically connecting with said two electrooptic switching elements, the transmitting antenna that electrically connects with corresponding radio-frequency power amplifier respectively, and the reception antenna that electrically connects with corresponding low noise amplifier respectively.
8. light-carried wireless switching system according to claim 7 is characterized in that: said analog optic fiber line is the monomode fiber circuit, and its operation wavelength is 1550nm.
9. light-carried wireless switching system according to claim 8 is characterized in that: said WiFi access point adopts the 802.11b/g standard, is operated in the 2.4GHz frequency range.
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| CN2012101119767A CN102664681A (en) | 2012-04-16 | 2012-04-16 | Radio-over-fiber switching system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103200702A (en) * | 2013-03-21 | 2013-07-10 | 广州飞瑞敖电子科技有限公司 | Distributed type ratio-over-fiber-wireless fidelity (WiFi)-Modbus network |
| CN103220043A (en) * | 2013-03-27 | 2013-07-24 | 广州飞瑞敖电子科技有限公司 | Combiner or shunt way of double-line WiFi signal mixed transmission |
| CN104301862A (en) * | 2014-10-22 | 2015-01-21 | 广州飞瑞敖电子科技有限公司 | Internet of Things information platform |
| CN104320783A (en) * | 2014-06-16 | 2015-01-28 | 深圳海联讯科技股份有限公司 | ROF radio frequency switching system and radio frequency switching method |
| US9344141B2 (en) | 2013-07-01 | 2016-05-17 | Industrial Technology Research Institute | Electronic device and data control method |
| TWI596901B (en) * | 2013-09-11 | 2017-08-21 | Grand Mate Co Ltd | Wi-Fi / radio frequency conversion device |
| CN107800485A (en) * | 2016-08-30 | 2018-03-13 | 成都芯瑞科技股份有限公司 | Light carries radio frequency analog transmission signal transceiver |
| CN109379141A (en) * | 2018-11-21 | 2019-02-22 | 广州飞瑞敖电子科技股份有限公司 | A kind of time division duplex light-carried wireless Transmission system |
| CN112468232A (en) * | 2020-11-13 | 2021-03-09 | 锐捷网络股份有限公司 | Control signal transmission system and method |
| CN113992271A (en) * | 2021-10-26 | 2022-01-28 | 京信网络系统股份有限公司 | 5G millimeter wave base station |
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| CN103200702A (en) * | 2013-03-21 | 2013-07-10 | 广州飞瑞敖电子科技有限公司 | Distributed type ratio-over-fiber-wireless fidelity (WiFi)-Modbus network |
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| US9344141B2 (en) | 2013-07-01 | 2016-05-17 | Industrial Technology Research Institute | Electronic device and data control method |
| TWI596901B (en) * | 2013-09-11 | 2017-08-21 | Grand Mate Co Ltd | Wi-Fi / radio frequency conversion device |
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| CN107800485A (en) * | 2016-08-30 | 2018-03-13 | 成都芯瑞科技股份有限公司 | Light carries radio frequency analog transmission signal transceiver |
| CN109379141A (en) * | 2018-11-21 | 2019-02-22 | 广州飞瑞敖电子科技股份有限公司 | A kind of time division duplex light-carried wireless Transmission system |
| CN112468232A (en) * | 2020-11-13 | 2021-03-09 | 锐捷网络股份有限公司 | Control signal transmission system and method |
| CN113992271A (en) * | 2021-10-26 | 2022-01-28 | 京信网络系统股份有限公司 | 5G millimeter wave base station |
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Application publication date: 20120912 |