CN101895343A - WiFi (Wireless Fidelity) half-duplex bidirectional simulation optical fiber transmission system - Google Patents
WiFi (Wireless Fidelity) half-duplex bidirectional simulation optical fiber transmission system Download PDFInfo
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- CN101895343A CN101895343A CN2010102131593A CN201010213159A CN101895343A CN 101895343 A CN101895343 A CN 101895343A CN 2010102131593 A CN2010102131593 A CN 2010102131593A CN 201010213159 A CN201010213159 A CN 201010213159A CN 101895343 A CN101895343 A CN 101895343A
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Abstract
The invention discloses a WiFi (Wireless Fidelity) half-duplex bidirectional simulation optical fiber transmission system, comprising a near end half-duplex device, a far end half-duplex device, an optical fiber and a cover antenna. The near end half-duplex device is provided with an access terminal connected with a WiFi access point, a downlink end for transmitting downlink signals and an uplink end for receiving uplink signals, and the downlink end is electrically connected with a near end electronic-optical conversion module. The far end half-duplex device is provided with an access terminal connected with the cover antenna, an uplink end for transmitting uplink signals and a downlink end for receiving downlink signals, the uplink end is electrically connected with a far end electronic-optical conversion module, and the downlink end is electrically connected with a far end optical-electronic conversion module. The optical fiber is connected between the electronic-optical conversion module at one end and the optical-electronic conversion module at the other end and is used for finishing the cover of WiFi radio frequency signals. The invention has the advantages of low cost, large range and capability of remotely transmitting the WiFi radio frequency signals.
Description
[technical field]
The present invention relates to the long-distance transmissions technology of the signal of WiFi access point (AP, Access Point), relate in particular to a kind of WiFi half-duplex bidirectional simulation fiber optic transmission system.
[technical background]
At present, the WiFi WLAN (wireless local area network) is just more and more universal, become the preferred option of setting up WLAN (wireless local area network), but the signal cover of WiFi access point (AP) is narrower, is generally: indoor, and 50～100 meters; Outdoor, 100～150 meters.
In order to enlarge the coverage of WiFi signal, the main method of taking has: the radiant power that strengthens WiFi equipment; Adopt optical fiber or cable transmission WiFi signal, increase the WiFi transmission range.
WiFi adopts ISM band, and its radiant power is restricted, and therefore adopts the radiant power that strengthens WiFi equipment, the method that enlarges the WiFi signal cover to be restricted.
The distance of cable transmission WiFi radiofrequency signal is very short, has only about 200 meters, therefore adopts the coverage of wire cable raising WiFi signal, DeGrain.
At present, because the price of optical fiber is more and more cheap, beginning one's study in the industry increases the WiFi signal cover by Optical Fiber Transmission under the rational prerequisite of cost, and in theory, the method for employing mainly contains:
1,, connects far-end WiFi access point by the Optical Fiber Transmission base band data.The far-end access point receives base band data, by data processing, modulation, frequency conversion, power amplification, goes out by aerial radiation again.The far-end access point function complexity of this scheme is unfavorable for system management and upgrading.
2,, after the far-end access point received signal,, go out by aerial radiation again through frequency conversion, power amplification by Optical Fiber Transmission WiFi intermediate-freuqncy signal.This scheme far-end access point still needs complicated local oscillator, frequency converter and filter.
3, by Optical Fiber Transmission WiFi radiofrequency signal, distant-end node only need pass through power amplification, light/electricity conversion, electricity/light conversion, function and structure are all very simple, and the access of WiFi, authentication and management are all finished in control centre, the management of system and upgrade very convenient.
[summary of the invention]
The objective of the invention is to utilize the advantage of Optical Fiber Transmission WiFi radiofrequency signal, realize a kind of WiFi half-duplex bidirectional simulation fiber optic transmission system, cover so that the WiFi signal is realized low-cost long-distance large-range.
For realizing this purpose, the present invention adopts following technical scheme:
A kind of WiFi half-duplex bidirectional simulation of the present invention fiber optic transmission system, it comprises:
Near end half-duplex device, have the incoming end that is connected with the WiFi access point, the upstream ends that is used to send the downstream end of downstream signal and is used to receive upward signal, its downstream end is electrically connected with near-end electricity/light modular converter, and its upstream ends is electrically connected with near-end light/electric modular converter;
Far end half-duplex device, have the incoming end that is connected with cover antenna, the downstream end that is used to send the upstream ends of upward signal and is used to receive downstream signal, its upstream ends is electrically connected with far-end electricity/light modular converter, and its downstream end is electrically connected with far-end light/electric modular converter;
Optical fiber is connected between the light/electric modular converter of the electricity/light modular converter of an end and the other end logical to realize looking of downstream signal and upward signal;
Described cover antenna is used to finish the covering of WiFi radiofrequency signal.
During signal downlink, near end half-duplex device is connected its incoming end and downstream end, will be after the near-end electricity/the light modular converter converts light signal to from the radiofrequency signal of WiFi access point, after optical fiber arrives far-end light/electric modular converter converts the signal of telecommunication to, be transferred to far end half-duplex device, the path that far end half-duplex device is connected between its downstream end and the incoming end is finished signal downlink so that downstream signal is transferred to cover antenna;
During signal uplink, far end half-duplex device is connected its incoming end and upstream ends, will be after the far-end electricity/the light modular converter converts light signal to from the radiofrequency signal of cover antenna, after optical fiber arrives near-end light/electric modular converter converts the signal of telecommunication to, be transferred near end half-duplex device, near end half-duplex device is connected path between its upstream ends and the incoming end so that uplink signal transmissions to WiFi access point is finished signal uplink.
Described near end half-duplex device and/or far end half-duplex device comprise:
The radio-frequency power detection circuit is used to survey the signal power of its downstream end, produces detectable signal when signal power surpasses preset value;
Shaping circuit carries out shaping to this detectable signal;
Drive circuit produces two reverse control signals, its incoming end of conducting and downstream end when signal downlink, its incoming end of conducting and upstream ends when signal uplink according to this detectable signal.
Preferable, be serially connected with power amplifier between described far-end light/electric modular converter and the far end half-duplex device downstream end, be used for downstream signal is amplified.And be serially connected with low noise amplifier between described far end half-duplex device upstream ends and the far-end electricity/light modular converter, be used for upward signal is amplified.
Preferable, described cover antenna adopts omnidirectional antenna.The signal bandwidth of described light/electric modular converter or electricity/light modular converter is confined to any number between 1700MHz～2700MHz.Described optical fiber is monomode fiber.
The signal of telecommunication of the light of described near-end or far-end/electric modular converter output is descending after carrying out power back-off with the power compensating unit that this light/electric modular converter one realizes through one.Perhaps, be serially connected with the power compensating unit that realizes with the power amplifier one between described far-end light/electric modular converter and the power amplifier so that downstream signal is carried out power back-off.
Compared with prior art, the present invention has following advantage:
1, the native system that forms by fiber optic stretch, form near-end node and distant-end node, between near-end node and the distant-end node by Optical Fiber Transmission WiFi radiofrequency signal, characteristics by the optical fiber long-distance transmissions, can increase the transmission range of WiFi radiofrequency signal greatly, so that further realize that by omnidirectional antenna wider signal covers;
Although the relative cable of the cost of 2 optical fiber is high slightly, but decline along with the optical fiber cost, and by the radio frequency transmission technology, the structure of the remote equipment of system can be simplified greatly, by the near-end of realizing by half-duplex device and the half-duplex device of far-end, for the distant-end node cost during with respect to known intermediate frequency and base band long-distance transmissions, can reduce the cost of building a station of distant-end node greatly, this obviously more can adapt with the application level of WiFi, and is more susceptible to user acceptance;
3, because the structure of distant-end node is comparatively simple efficient, the narrower occasion even power amplifier or low noise amplifier can be set in some spaces, only parts such as light requirement/electricity, electricity/light modular converter and half-duplex device, antenna are realized getting final product, so have attached characteristics such as maintain easily, maintenance cost is low, failure rate is low.
[description of drawings]
Fig. 1 is the theory diagram of WiFi half-duplex bidirectional simulation fiber optic transmission system of the present invention;
Fig. 2 is the more detailed theory diagram of near-end node of the present invention;
Fig. 3 is the more detailed theory diagram of distant-end node of the present invention;
Theory diagram when Fig. 4 adopts half-duplex device to realize for half-duplex device of the present invention.
[embodiment]
The present invention is further illustrated below in conjunction with drawings and Examples:
Fig. 1 illustrates the structured flowchart of the exemplary embodiment of WiFi half-duplex bidirectional simulation fiber optic transmission system of the present invention.WiFi half-duplex bidirectional simulation fiber optic transmission system comprises: WiFi access point (be called for short AP) 101, near-end node 102, two optical fiber 103, distant-end node 104, cover antenna 105.
WiFi access point (AP) 101, near-end node 102, optical fiber 103, distant-end node 104, cover antenna 105 constitute a complete WiFi optical fiber link.
Near-end node 102 is made of near end half-duplex device 110, photoelectricity/electric light module 111, and wherein, the near end half-duplex device 110 preferred radio-frequency (RF) switch that adopt realize.
Distant-end node 104 is made of photoelectricity/electric light module 111, low noise amplifier (LNA) 112, power amplifier (PA) 113, far end half-duplex device 114, and in like manner, far end half-duplex device preferably adopts radio-frequency (RF) switch to realize.
Each photoelectricity/electric light module 111 constitutes jointly by a light/electric modular converter and one electricity/light modular converter, is respectively applied for to finish from light to electricity and the conversion of signals from the electricity to light.
Consult Fig. 4, described half- duplex device 110 and 114, comprise radio-frequency power detection circuit 201, shaping circuit 401 and drive circuit 402, it has the upstream ends (Rx) that a downstream end (Tx), that is used to transmit downlink radio-frequency signal (abbreviation downstream signal) is used to transmit up radiofrequency signal (abbreviation upward signal), and an incoming end that is used to gather the uplink and downlink radiofrequency signal.Described radio-frequency power detection circuit 201 is used to survey the signal power of its downstream end (Tx), produces detectable signal when signal power surpasses preset value; Shaping circuit 401 carries out shaping to this detectable signal; Drive circuit 402 produces two reverse control signals, its incoming end of conducting and downstream end (Tx) when signal downlink, its incoming end of conducting and upstream ends (Rx) when signal uplink according to this detectable signal.The preset value of signal power depends on the concrete components and parts that switching circuit adopts, and is in common knowledge for those skilled in the art, do not give unnecessary details for this reason.About the concrete effect of half- duplex device 110 and 114 in near-end node and distant-end node, will after do further announcement.
Please in conjunction with Fig. 1 and Fig. 4, between WiFi access point 101 and cover antenna 105, matching by two half- duplex device 110 and 114 forms down link and the up link that realizes WiFi radiofrequency signal transmitted in both directions.
From access point 101 to the descending radiofrequency signal of cover antenna 105, be called for short downstream signal, at first enter near end half-duplex device 110, the radio-frequency power detection circuit 201 of half-duplex device 110 detects the power of downstream signal, produce control signal, the incoming end and the downstream end conducting of control half-duplex device 110, downstream signal is transferred to the near-end electricity/light modular converter that is electrically connected with half-duplex device 110 thereupon, is light signal with downstream signal from electrical signal conversion, transmit to distant-end node via a corresponding optical fiber 103 then, realize looking logical far-end light/electric modular converter by this optical fiber 103 with this near-end electricity/light modular converter, behind the downstream signal of receiving with optical signal transmission, be converted into the signal of telecommunication, after transfer to power amplifier and carry out power amplification, signal after the amplification is transferred to the half-duplex device 114 of far-end, radio-frequency power detection circuit 303 in the far end half-duplex device 114 detects the power of downstream signal, produce control signal, control its downstream end and its incoming end is conducted thereupon, make downstream signal further be transferred to cover antenna and finish signal and cover by far end half-duplex device 114.Thus, descending from access point 101 beginnings, promptly constitute down link of the present invention from cover antenna to the communication link that the space covers at last.
In like manner, cover antenna 105 receives the up radiofrequency signal in space, be called for short upward signal, at first enter far end half-duplex device 114, half-duplex device 114 is switched back default conditions, be about to the operating state that its upstream ends (Rx) and its incoming end are conducted, after allowing that upward signal goes upward to low noise amplifier and amplifies, through far-end electricity/light modular converter switching signal standard, look logical through another optical fiber and near-end light/electric modular converter again, after near-end light/electric modular converter is converted to the signal of telecommunication with upward signal from light signal, send near end half-duplex device 110, half-duplex device 110 is switched back default conditions, is about to the operating state that its upstream ends (Rx) and its incoming end are conducted, thereby further does further processing for access point 101 uplink signal transmissions.Thus, up from cover antenna 105 beginnings, the communication link that enters access point 101 at last promptly constitutes up link of the present invention.
As aforesaid default conditions, when native system is in the state of signal uplink (Rx), perhaps system do not have that signal uplink receives, under the state of descending transmission, being connected between near end half-duplex device 110 and far end half-duplex device 114 all closed its upstream ends (Rx) and its incoming end.
Exemplary embodiment WiFi access point of the present invention (AP) 101 adopts the 802.11g standard, is operated in the ISM band of 2.4GHz.
Exemplary embodiment optical fiber 103 of the present invention adopts general single mode fiber.
Exemplary embodiment cover antenna 105 of the present invention adopts omnidirectional antenna.
Exemplary embodiment optical fiber 103 of the present invention adopts two optical signal transmission fibers, and the optical fiber of top is used for transmission of downlink signal among Fig. 1, and the optical fiber of below is used to transmit upward signal among Fig. 1.Also can realize single fiber transmission uplink and downlink two-way signaling when adopting wavelength-division multiplex technique in photoelectricity/electric light module 111.
Fig. 2 illustrates the detailed diagram of the near-end node in the exemplary embodiment of the present invention.
Near-end node 102 is made of near end half-duplex device 110, electricity/light modular converter (E/O) 210 and light/electric modular converter (E/O) 220.
Near end half-duplex device 110 is made of radio-frequency power detection circuit 201, switch 202.Radio-frequency power detection circuit 201 adopts the directive overrurrent relay detector, surveys the power of the downstream signal of WiFi access point (AP) 101 emissions.When WiFi access point (AP) 101 received signals, when perhaps not working, switch 202 is connected upstream ends (Rx) and incoming end; When WiFi access point (AP) 101 transmitting downstream signals, radio-frequency power detection circuit 201 produces detection signal immediately, and through amplification, shaping, control switch 202 is connected downstream end (Tx) and incoming ends.
Near-end electricity/light modular converter (E/O) 210 is made of laser 206, optical modulator 207.Electricity/light modular converter (E/O) 210 is realized the conversion of WiFi rf signal to light signal.
Near-end light/electric modular converter (O/E) 220 comprises: photo-detector 205, filter 204, power compensating unit 203.Light/electric modular converter (O/E) 220 is realized the conversion of light signal to the WiFi rf signal.
Fig. 3 illustrates the detailed diagram of the distant-end node in the exemplary embodiment of the present invention.
Distant-end node 104 is by far end half-duplex device 114, electricity/light modular converter (E/O) 210 and light/electric modular converter (E/O) 220 formations, power amplifier (PA) 301, low noise amplifier (LNA) 302.
Far end half-duplex device 114 is made of radio-frequency power detection circuit 303, switch 304.Radio-frequency power detection circuit 303 adopts directive overrurrent relay detector, the power output of probe power amplifier (PA) 301.When cover antenna 105 reception upward signals, when perhaps power amplifier (PA) 301 did not have downstream signal output, switch 304 was connected the upstream ends (Rx) and the incoming end of half-duplex device 114; When WiFi access point (AP) 101 transmitting downstream signals, near end half-duplex device 110 in the near-end node 102 is connected downstream end (Tx) and incoming end, power amplifier (PA) 301 has power output, radio-frequency power detection circuit 303 produces detection signal immediately, through amplification, shaping, control half-duplex device 304 is connected its downstream end (Tx) and incoming ends, downlink radio-frequency signal promptly by cover antenna 105 to the free space radiation.
Far-end electricity/light modular converter (E/O) 210 is made of laser 206, optical modulator 207.Electricity/light modular converter (E/O) 210 is realized the conversion of WiFi rf signal to light signal.
Far-end light/electric modular converter (O/E) 220 comprises: photo-detector 205, filter 204, power back-off 203.Light/electric modular converter (O/E) 220 is realized the conversion of light signal to the WiFi rf signal.In the down link, described power compensating unit 203 realizes with light/electric modular converter one in the present embodiment, but in a not shown embodiment, can realize with power amplifier 113 one.
Near-end photoelectricity/electrooptic conversion module has identical 26S Proteasome Structure and Function with far-end photoelectricity/electrooptic conversion module in the exemplary embodiment of the present invention.Wherein power compensating unit is used to compensate the signal of telecommunication decay that the signal of telecommunication causes after changing through electricity/light conversion, optical fiber, light/electricity.
Half-duplex device 110 of the present invention is consulted Fig. 4.Radio frequency directive overrurrent relay detection circuit 201 shown in Figure 4 is surveyed the transmitting power of incoming end Cx and is produced detectable signal, detectable signal is through shaping circuit 401 and two reverse control signals of drive circuit 402 outputs, the state of control switch pipe Q2, Q3 and Q1, Q4 respectively.Half-duplex device 114 adopts close circuit with half-duplex device 110, different is, what the power detection circuit 201 of half-duplex device 110 was surveyed is the power that transmits of incoming end Cx, and the power detection circuit of half-duplex device 114 is the power of the signal of its downstream end of direct detection Tx then.Because of half- duplex device 110 and 114 is close, so do not show accompanying drawing separately for half-duplex device 114, those skilled in the art can realize the physical circuit of half-duplex device 114 easily in conjunction with description of the invention and Fig. 4.
The equipment (access point or cover antenna) that go up to connect as incoming end Cx is when working, switching tube Q2 and Q3 closure, and Q1 and Q4 disconnect, and incoming end Cx and upstream ends Rx connect;
When incoming end Cx received signal, two reverse control signals of drive circuit 402 outputs make switching tube Q2 and Q3 closure, and Q1 and Q4 disconnect, and incoming end Cx and upstream ends Rx connect;
When incoming end Cx transmitted, the detectable signal of radio-frequency power detection circuit 201 outputs through shaping circuit 401 and drive circuit 402, was exported two reverse control signals, makes switching tube Q1 and Q4 closure, and Q2 and Q3 disconnect, and incoming end Cx and downstream end Tx connect.
According to the physical circuit of half-duplex device shown in Figure 4,, can assist the system of the present invention that realizes according to the concrete annexation of native system.
Top description clearly show that exemplary embodiment of the present invention provides a kind of WiFi half-duplex bidirectional simulation fiber optic transmission system, and this system adopts Radio of Fiber Technology, realizes the half-duplex of WiFi radiofrequency signal, remote fiber distribution.
Distant-end node 104 has used power amplifier (PA) 113, low noise amplifier (LNA) 112 in the exemplary embodiment of the present invention, is used to improve the WiFi signal cover of distant-end node 104.When required Wi Fi radiofrequency signal coverage hour, power amplifier (PA) 113 and low noise amplifier (LNA) 112 in the described distant-end node 104 can remove, and further simplify structure, the volume of distant-end node, reduce cost.
The signal bandwidth of photoelectricity/electrooptic conversion module is 1700MHz～2700MHz in the exemplary embodiment of the present invention, can be used for the fiber distribution of other time division multiplexing mobile communication system radiofrequency signal.
Though shown exemplary embodiments more of the present invention above, but it should be appreciated by those skilled in the art that, under the situation that does not break away from principle of the present invention or spirit, can make a change these exemplary embodiments, scope of the present invention is limited by claim and equivalent thereof.
Claims (10)
1. WiFi half-duplex bidirectional simulation fiber optic transmission system is characterized in that it comprises:
Near end half-duplex device, have the incoming end that is connected with the WiFi access point, the upstream ends that is used to send the downstream end of downstream signal and is used to receive upward signal, its downstream end is electrically connected with near-end electricity/light modular converter, and its upstream ends is electrically connected with near-end light/electric modular converter;
Far end half-duplex device, have the incoming end that is connected with cover antenna, the downstream end that is used to send the upstream ends of upward signal and is used to receive downstream signal, its upstream ends is electrically connected with far-end electricity/light modular converter, and its downstream end is electrically connected with far-end light/electric modular converter;
Optical fiber is connected between the light/electric modular converter of the electricity/light modular converter of an end and the other end logical to realize looking of downstream signal and upward signal;
Described cover antenna is used to finish the covering of WiFi radiofrequency signal.
2. WiFi half-duplex bidirectional simulation fiber optic transmission system according to claim 1 is characterized in that:
During signal downlink, near end half-duplex device is connected its incoming end and downstream end, will be after the near-end electricity/the light modular converter converts light signal to from the radiofrequency signal of WiFi access point, after optical fiber arrives far-end light/electric modular converter converts the signal of telecommunication to, be transferred to far end half-duplex device, the path that far end half-duplex device is connected between its downstream end and the incoming end is finished signal downlink so that downstream signal is transferred to cover antenna;
During signal uplink, far end half-duplex device is connected its incoming end and upstream ends, will be after the far-end electricity/the light modular converter converts light signal to from the radiofrequency signal of cover antenna, after optical fiber arrives near-end light/electric modular converter converts the signal of telecommunication to, be transferred near end half-duplex device, near end half-duplex device is connected path between its upstream ends and the incoming end so that uplink signal transmissions to WiFi access point is finished signal uplink.
3. WiFi half-duplex bidirectional simulation fiber optic transmission system according to claim 1 and 2 is characterized in that described near end half-duplex device and/or far end half-duplex device comprise:
The radio-frequency power detection circuit is used to survey the signal power of its downstream end, produces detectable signal when signal power surpasses preset value;
Shaping circuit carries out shaping to this detectable signal;
Drive circuit produces two reverse control signals according to this detectable signal, its incoming end of conducting and downstream end when signal downlink, acquiescence its incoming end of conducting and upstream ends when signal uplink.
4. WiFi half-duplex bidirectional simulation fiber optic transmission system according to claim 3 is characterized in that: be serially connected with power amplifier between described far-end light/electric modular converter and the far end half-duplex device downstream end, be used for downstream signal is amplified.
5. WiFi half-duplex bidirectional simulation fiber optic transmission system according to claim 3 is characterized in that: be serially connected with low noise amplifier between described far end half-duplex device upstream ends and the far-end electricity/light modular converter, be used for upward signal is amplified.
6. WiFi half-duplex bidirectional simulation fiber optic transmission system according to claim 1 and 2 is characterized in that: described cover antenna adopts omnidirectional antenna.
7. WiFi half-duplex bidirectional simulation fiber optic transmission system according to claim 1 and 2 is characterized in that: the signal bandwidth of described light/electric modular converter or electricity/light modular converter is confined to any number between 1700MHz～2700MHz.
8. WiFi half-duplex bidirectional simulation fiber optic transmission system according to claim 1 and 2 is characterized in that: described optical fiber is monomode fiber.
9. WiFi half-duplex bidirectional simulation fiber optic transmission system according to claim 1 and 2 is characterized in that: the signal of telecommunication of the light of described near-end or far-end/electric modular converter output is descending after carrying out power back-off with the power compensating unit that this light/electric modular converter one realizes through one.
10. WiFi half-duplex bidirectional simulation fiber optic transmission system according to claim 4 is characterized in that: be serially connected with the power compensating unit that realizes with the power amplifier one between described far-end light/electric modular converter and the power amplifier so that downstream signal is carried out power back-off.
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| CN102098804A (en) * | 2011-01-28 | 2011-06-15 | 广州飞瑞敖电子科技有限公司 | Time-division duplex frequency division multiplexing WiFi signal coverage system, unit and method |
| CN102098220A (en) * | 2011-01-26 | 2011-06-15 | 广州飞瑞敖电子科技有限公司 | WiFi (Wireless Fidelity) radio frequency switchboard, signal switching method thereof and system adopting switchboard |
| 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 |
| CN104640120A (en) * | 2015-02-11 | 2015-05-20 | 杭州中威电子股份有限公司 | Covering method and transmission equipment for high-speed mobile WIFI (Wireless Fidelity) |
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| WO2008127043A1 (en) * | 2007-04-12 | 2008-10-23 | Jcastnetworks Co., Ltd. | System for wireless networking using duct |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102098220A (en) * | 2011-01-26 | 2011-06-15 | 广州飞瑞敖电子科技有限公司 | WiFi (Wireless Fidelity) radio frequency switchboard, signal switching method thereof and system adopting switchboard |
| CN102098804A (en) * | 2011-01-28 | 2011-06-15 | 广州飞瑞敖电子科技有限公司 | Time-division duplex frequency division multiplexing WiFi signal coverage system, unit and method |
| CN102098804B (en) * | 2011-01-28 | 2014-08-13 | 广州飞瑞敖电子科技有限公司 | Time-division duplex frequency division multiplexing WiFi signal coverage system, unit and method |
| 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 |
| CN103220043B (en) * | 2013-03-27 | 2015-08-26 | 广州飞瑞敖电子科技有限公司 | Conjunction road/shunt the mode of two-way WiFi signal mixed transport |
| 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 |
| CN104301862B (en) * | 2014-10-22 | 2017-12-08 | 广州飞瑞敖电子科技有限公司 | Internet of things information platform |
| CN104640120A (en) * | 2015-02-11 | 2015-05-20 | 杭州中威电子股份有限公司 | Covering method and transmission equipment for high-speed mobile WIFI (Wireless Fidelity) |
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Application publication date: 20101124 |