CN101902318B - Bidirectional analog optical fiber transmission system with mixed WiFi and 3G signals - Google Patents

Bidirectional analog optical fiber transmission system with mixed WiFi and 3G signals Download PDF

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CN101902318B
CN101902318B CN2010102131589A CN201010213158A CN101902318B CN 101902318 B CN101902318 B CN 101902318B CN 2010102131589 A CN2010102131589 A CN 2010102131589A CN 201010213158 A CN201010213158 A CN 201010213158A CN 101902318 B CN101902318 B CN 101902318B
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China
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signal
wifi
far
light
optical fiber
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CN2010102131589A
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Chinese (zh)
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CN101902318A (en
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庞文凤
孟学军
梅仲豪
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广州飞瑞敖电子科技有限公司
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Abstract

The invention discloses a bidirectional analog optical fiber transmission system with mixed WiFi and 3G signals. A WiFi radio-frequency signal and a 3G radio-frequency signal are combined and separated into a downgoing signal and an upgoing signal, the downgoing and upgoing signals are transmitted from a near-end node to a far-end node to complete the signal coverage, and the signal upgoing process is basically reverse or similar to the downgoing process, thus the system has the advantage of transmitting WiFi and 3G mixed radio-frequency signals with low cost, wide range and long distance.

Description

The bidirectional analog optical fiber transmission system that mixes WiFi, 3G signal
[technical field]
The present invention relates to the technical field of WiFi and the blend of 3G signal transmission, relate in particular to the bidirectional analog optical fiber transmission system of a kind of WiFi of mixing, 3G signal.
[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, only has 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, by the Optical Fiber Transmission base band data, connects far-end WiFi access point.Distance connection point receives base band data, by data processing, modulation, frequency conversion, power amplification, goes out by aerial radiation again.The distance connection point function of this scheme is complicated, is unfavorable for system management and upgrading.
2, by Optical Fiber Transmission WiFi intermediate-freuqncy signal, after distance connection point receives signal, through frequency conversion, power amplification, go out by aerial radiation again.This scheme distance connection 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 is 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.
On the other hand, 3G mobile communication (the constructed mobile communication system of communication protocol such as TD-SCDMA, WCDMA, CDMA2000) has become main flow, but because the restriction of 3G data communication capacity, along with the increase of mobile data services, operator is one after another with the main carrying of WiFi as the 3G data service.At present, China Telecom has proposed " Internet cell phone " strategy of " C+W (WiFi) ", China Mobile is defined as the key strategy that wireless broadband network is built with " TD+WiFi ", and CHINAUNICOM also begins to promote by WiFi the development of fixed network broadband and mobile data services.In China, the construction of " 3G+WiFi " is being carried out in high gear.
How more effectively WiFi signal and the blend of 3G signal to be transmitted, be the problem of needing solution badly.
[summary of the invention]
The object of the invention is to utilize the advantage of Optical Fiber Transmission radiofrequency signal, realize a kind of bidirectional analog optical fiber transmission system that mixes WiFi, 3G signal, with the low cost that realizes WiFi signal and 3G signal, remote, on a large scale blend covering.
For realizing this purpose, the present invention adopts following technical scheme:
A kind of bidirectional analog optical fiber transmission system that mixes WiFi, 3G signal of the present invention, the long-distance transmissions for the signal of realizing WiFi and 3G signal source is characterized in that it comprises:
Respectively be arranged at the radio-frequency (RF) switch of near-end and far-end, for one road WiFi signal being separated into down going channel and data feedback channel to realize half-duplex transmission; Respectively be arranged at the duplexer of near-end and far-end, for one road 3G signal being separated into down going channel and data feedback channel to realize full duplex or half-duplex transmission;
Descending mixer is used for and will closes the road to form the down mixing signal from the WiFi signal source and through the WiFi signal of near-end radio-frequency (RF) switch down going channel output with from the 3G signal source and through the 3G signal of the output of near-end duplexer; Descending splitter is used for the down mixing signal is separated into WiFi downstream signal and 3G downstream signal, and the down going channel through far end radio frequency switch and far-end duplexer transmits respectively;
The far-end combiner-divider, be transferred to cover antenna after the 3G downstream signal that is used for when signal downlink WiFi downstream signal and the far-end duplexer of the output of far end radio frequency switch being exported closes the road and finish covering, and the signal that when signal uplink cover antenna is received is separated into WiFi upward signal and 3G upward signal, and the data feedback channel through far end radio frequency switch and far-end duplexer transmits respectively;
Up mixer is used for the WiFi upward signal of far end radio frequency switch output and the 3G upward signal of far-end duplexer output are closed the road to form up mixed signal; Up splitter is used for up mixed signal is separated into WiFi upward signal and 3G upward signal, and the data feedback channel through near-end radio-frequency (RF) switch and near-end duplexer transmits back signal source respectively;
Optical fiber component is connected between descending mixer and the descending splitter, and is connected between up mixer and the up splitter, realizes the transmission of described down mixing signal and described up mixed signal.
Concrete, described near-end radio-frequency (RF) switch and/or far end radio frequency switch comprise: the radio-frequency power detection circuit for the signal power of surveying the radio-frequency (RF) switch down going channel, 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 down going channel of conducting when signal downlink according to this detectable signal; Its data feedback channel of acquiescence conducting when signal uplink.
Described optical fiber component comprises: near-end electricity/light modular converter is used for the down mixing signal of descending mixer output is converted to light signal from the signal of telecommunication; Downlink optical fiber is for the down mixing signal that transmits described light signal form; Far-end light/electric modular converter is used for the down mixing signal of described light signal form is converted to electrical signal form and is transferred to described descending splitter; Far-end electricity/light modular converter is used for the up mixed signal of up mixer output is converted to light signal from the signal of telecommunication; Uplink optical fibers is for the up mixed signal of transmitting described light signal form; Near-end light/electric modular converter is used for the up mixed signal of described light signal form is converted to electrical signal form and is transferred to described up splitter.
Better, be serially connected with power amplifier between described far-end light/electric modular converter and the far end radio frequency switch, be used for the down mixing signal is amplified.Be serially connected with low noise amplifier between described far end radio frequency switch and the far-end electricity/light modular converter, be used for up mixed signal is amplified.
Better, 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 uplink optical fibers and downlink optical fiber are 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.As a kind of variant, 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, zooms out the native system that forms by optical fiber component, form near-end node and distant-end node, between near-end node and the distant-end node by the radiofrequency signal of Optical Fiber Transmission WiFi, 3G blend, characteristics by the optical fiber long-distance transmissions, can greatly increase the transmission range of WiFi and 3G radiofrequency signal, in order to further realize that by omnidirectional antenna wider signal covers;
2, the native system of realization Optical Fiber Transmission is structurally relatively simple, only pass through the common element of radio-frequency (RF) switch, duplexer, mixer and splitter and so on, just the signal blend in the time of can realizing near-end, link disjoint, further realize that at far-end signal partition and link merge again, because technology is simple, the element popularity rate is high, so obviously can expect can be not too high for its cost;
Although the relative cable of the cost of 3 optical fiber is slightly high, but the decline along with the optical fiber cost, and by the radio frequency transmission technology, itself can simplify the structure of the remote equipment of system greatly, by the near-end of being realized 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 greatly reduce the cost of building a station of distant-end node, this obviously more can adapt with the hierarchy of users of WiFi and 3G, easier being implemented;
4, 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 the parts such as light requirement/electricity, electricity/light modular converter and half-duplex device, antenna are realized getting final product, thus have maintain easily, the attached characteristics such as maintenance cost is low, failure rate is low.
[description of drawings]
Fig. 1 is the theory diagram of the bidirectional analog optical fiber transmission system of the present invention's mixing WiFi, 3G signal;
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;
Fig. 4 is the theory diagram of radio-frequency (RF) switch 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 exemplary embodiment of the bidirectional analog optical fiber transmission system of the present invention's mixing WiFi, 3G signal.The bidirectional analog optical fiber transmission system that mixes WiFi, 3G signal comprises: WiFi access point (being called for short AP) 101,3G radiofrequency signal interface 102, near-end node 103, uplink optical fibers and downlink optical fiber 104, distant-end node 105, cover antenna 106.
WiFi access point (AP) 101 and 3G radiofrequency signal interface 102 participate in respectively the signal transmission of native system as signal source, each signal source, near-end node 103, optical fiber 104, distant-end node 105, cover antenna 106 consist of a complete WiFi optical fiber link.
Near-end node 103 is made of near-end radio-frequency (RF) switch 110, near-end duplexer 113, descending mixer 111, up splitter 114, photoelectricity/electric light module 112.Near-end radio-frequency (RF) switch 110 built-in directed radio-frequency power detection circuits wherein, the transmit signal power of directional detection WiFi access point 101, and produce control signal, the state of control radio-frequency (RF) switch.Photoelectricity/electric light module 112 has light/electric modular converter and electricity/light modular converter, is applied to respectively in up link and the down link.
Near-end radio-frequency (RF) switch 110 in the near-end node 103 is divided into down going channel and data feedback channel with the WiFi radiofrequency signal of WiFi access point 101; Near-end duplexer 113 in the near-end node 103 also is divided into down going channel and data feedback channel with the 3G mobile communication radio frequency signal.
Up splitter 114 in the near-end node 103 is separated into WiFi upward signal and 3G upward signal with the up mixed signal of near-end light/electric modular converter output, will disclose in aftermentioned about the particular content of up mixed signal.
Descending mixer 111 in the near-end node 103 will through the WiFi signal of the down going channel of near-end radio-frequency (RF) switch 110 output and through the 3G signal of the down going channel output of near-end duplexer output at synthetic one tunnel down mixing signal of radio-frequency stage, be loaded on electricity in the near-end node 103/light modular converter, realize that the signal of telecommunication to the conversion of light signal, is transferred to distant-end node 105 by optical fiber 104.
Aftermentioned distant-end node 105 is by the up mixed signal of optical fiber 104 transmission, convert light signal to the signal of telecommunication through light/electric modular converter in the near-end node 103, then the up splitter 114 by near-end node 103 resolves into WiFi upward signal and 3G upward signal, the WiFi upward signal is transferred to WiFi access point 101 through the data feedback channel of near-end radio-frequency (RF) switch 110, and the 3G upward signal is got back to 3G signal source (interface) through the up channel of up duplexer.
Distant-end node 105 is made of photoelectricity/electric light module 120, low noise amplifier (LNA) 124, power amplifier (PA) 121, up mixer 125, descending splitter 122, far-end duplexer 126, far-end combiner-divider 127 and far end radio frequency switch 123, in like manner, far-end photoelectricity/electrooptic conversion module 120 comprises light/electric modular converter and electricity/light modular converter, is applied to respectively in the down link and up link of native system.
In like manner, far end radio frequency switch 123 built-in directed radio-frequency power detection circuits, directional detection enters the transmit signal power (from power amplifier) of its down going channel, and produces control signal, the state of control radio-frequency (RF) switch.
Radio-frequency power amplifier 121 amplifies the down mixing signal that light/electric modular converter is exported of far-end, and this power amplifier 121 is preferably the wide-band radio frequency power amplifier of 20dB in the present embodiment; Radio frequency low-noise amplifier 124 amplifies WiFi and the 3G hybrid radio frequency signal (being treated to up mixed signal in aftermentioned) that cover antenna 106 receives, and this low noise amplifier 124 is preferably the 20dB wideband low noise amplifier in the present embodiment.
In like manner, the far end radio frequency switch 123 in the distant-end node 105 is divided into down going channel and data feedback channel with the WiFi radiofrequency signal; Far-end duplexer 126 in the distant-end node 105 also is divided into down going channel and data feedback channel with the 3G mobile communication radio frequency signal.
Descending splitter 122 is separated into two branch roads with the down mixing signal of radio-frequency power amplifier 121 outputs, and one the tunnel is the WiFi downstream signal, through the down going channel transmission of far end radio frequency switch 123; Another road is the 3G downstream signal, through the downlink transmission of far-end duplexer 126.
The up mixer 125 that is included in far-end closes the road with the signal of the uplink of the signal of the data feedback channel of far end radio frequency switch 123 and far-end duplexer 126, form up mixed signal, this up mixed signal has comprised the up radiofrequency signal of WiFi and the up radiofrequency signal of 3G mobile communication, and the source of signal will be disclosed in aftermentioned.
Far-end combiner-divider 127, the 3G downstream signal of on the one hand the WiFi downstream signal of the down going channel output of far end radio frequency switch 123 and the down going channel of far-end duplexer 126 being exported closes Lu Chengyi road signal, then via cover antenna 106 to space radiation; On the other hand, WiFi and 3G hybrid radio frequency signal that cover antenna 106 is received are separated into WiFi upward signal and 3G upward signal, be loaded into respectively the uplink of far end radio frequency switch 123 and the uplink of far-end duplexer 126, and be output subsequently to described up mixer 125 and mix the road to form described up mixed signal.
As seen, no matter be positioned at far-end or near-end, each photoelectricity/electric light module consists of jointly by a light/electric modular converter and one electricity/light modular converter, be respectively applied to finish from light to electricity and the conversion of the signal from the electricity to light, photoelectricity/the electrooptic conversion module 112 of near-end, the photoelectricity/electrooptic conversion module 120 of far-end and two groups of optical fiber 104 common formation optical fiber components are used for realizing that the signal between near-end node 103 and the distant-end node 105 transmits.
Consult Fig. 4, described radio-frequency (RF) switch 110 and 123, comprise radio-frequency power detection circuit 203 (or 330, consult Fig. 3), shaping circuit 401 and drive circuit 402, it has the upstream ends (Rx) that a downstream end (Tx), that is used for transmission downlink radio-frequency signal (abbreviation downstream signal) is used for transmitting up radiofrequency signal (abbreviation upward signal), and an incoming end (Cx) that is used for gathering the uplink and downlink radiofrequency signal.Described radio-frequency power detection circuit 203 is used for surveying 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, produce two reverse control signals according to this detectable signal, its incoming end of conducting and downstream end (Tx) form described down going channel when signal downlink, its incoming end of conducting and upstream ends (Rx) form described data feedback channel when signal uplink.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 radio-frequency (RF) switch 110 and 123 in near-end node 103 and distant-end node 105, will after do further announcement.
Please in conjunction with Fig. 1 and Fig. 4, jointly disclose the down link of native system and the course of work of up link.
From access point 101 and interface 102 to cover antenna 106 descending WiFi and 3G radiofrequency signal, at first, the WiFi radiofrequency signal enters near-end radio-frequency (RF) switch 110, the power that the radio-frequency power detection circuit 203 of radio-frequency (RF) switch 110 detects the WiFi radiofrequency signal surpasses preset value, produce control signal, incoming end and the downstream end conducting of control radio-frequency (RF) switch 110, down going channel forms, and downstream signal is transferred to the descending mixer 111 that is electrically connected with radio-frequency (RF) switch 110 through this down going channel thereupon; And the 3G radiofrequency signal enters near-end duplexer 113, is also transferred to described descending mixer 111 by the down going channel by near-end duplexer 113.Then, descending mixer 111 will close the road from the WiFi signal of near-end radio-frequency (RF) switch 110 down going channels with from the 3G signal of near-end duplexer 113 down going channels, form descending mixed road signal, this descending mixed road signal is transferred to near-end electricity/light modular converter by descending mixer 111.Near-end electricity/light modular converter and then the down mixing signal is converted to light signal from the signal of telecommunication, then via a corresponding optical fiber 104 to the distant-end node transmission, transfer to far-end light/electric modular converter by this optical fiber 104.Far-end light/electric modular converter is converted into the signal of telecommunication behind the down mixing signal of receiving with optical signal transmission, after transfer to power amplifier 121 and carry out power amplification, the down mixing signal after the amplification is transferred to descending splitter 122.Descending splitter 122 and then this down mixing signal is separated into WiFi downstream signal and 3G downstream signal is transferred to respectively the down going channel of far end radio frequency switch 123 and the down going channel of far-end duplexer 126.The power that radio-frequency power detection circuit 303 in the far end radio frequency switch 123 detects signal in the down going channel surpasses preset value, produce control signal, control its downstream end and its incoming end is conducted thereupon, down going channel is connected thus, and the WiFi downstream signal is able to further be transferred to far-end combiner-divider 127 by far end radio frequency switch 123; Far-end duplexer 126 also transfers to far-end combiner-divider 127 with the 3G downstream signal through its down going channel.Far-end combiner-divider 127 and then WiFi downstream signal and 3G downstream signal closed the road covers with settling signal to space radiation through cover antenna.Thus, descending from access point 101 and interface 102 beginnings, the communication link that covers to the space from cover antenna at last namely consists of down link of the present invention.
In like manner, cover antenna 106 receives the up radiofrequency signal in space, and this radiofrequency signal has been mixed WiFi upward signal and 3G upward signal.This WiFi, 3G hybrid radio frequency signal at first enter far-end combiner-divider 127, are separated into separate WiFi upward signal and 3G upward signal, transfer to respectively the data feedback channel of far end radio frequency switch 123 and the data feedback channel of far-end duplexer 126.Because the normally off (acquiescence) of far end radio frequency switch 123 is for connecting its data feedback channel, so this WiFi upward signal is transferred to up mixer 125 then, meanwhile, the 3G upward signal is also transferred to up mixer 125 by far-end duplexer 126 through its data feedback channel.Up mixer 125 closes the road with WiFi upward signal and 3G upward signal then, forms to go on the way mixed signal and export low noise amplifier to and amplify.Up mixed signal after being exaggerated through far-end electricity/light modular converter switching signal standard, is looked logical through another optical fiber and near-end light/electric modular converter again.Near-end light/electric modular converter will send to up splitter 114 after will being converted to the signal of telecommunication from light signal from the up mixed signal of distant-end node 105.Up splitter 114 should up mixed signal be separated into WiFi upward signal and 3G upward signal then, was transferred to respectively the data feedback channel of near-end radio-frequency (RF) switch 110 and the data feedback channel of near-end duplexer 113.Because near-end radio-frequency (RF) switch 110 its data feedback channels of acquiescence conducting, so this WiFi upward signal namely is transmitted back WiFi access point 101, simultaneously, the 3G upward signal also is transferred to described interface 102 by near-end duplexer 113 along its data feedback channel.Thus, up from cover antenna 106 beginnings, the communication link that enters at last access point 101 or interface 102 namely consists of up link of the present invention.
As aforesaid default conditions, when native system is in the state of signal uplink (Rx), perhaps system does not have under the state of signal uplink reception, descending transmission, be connected its data feedback channel of i.e. conducting between near-end radio-frequency (RF) switch 110 and far end radio frequency switch 123 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 104 of the present invention adopts general single mode fiber.
Exemplary embodiment cover antenna 106 of the present invention adopts omnidirectional antenna.
Exemplary embodiment optical fiber 104 of the present invention adopts two optical signal transmission fibers, and the optical fiber of top is used for transmission down mixing signal among Fig. 1, and the optical fiber of below is used for transmitting up mixed signal among Fig. 1.As a not shown embodiment of the present invention, when adopting wavelength-division multiplex technique, photoelectricity/electric light module 112,120 also can realize single fiber transmission uplink and downlink two-way signaling.
The alleged 3G mobile communication signal of exemplary embodiment of the present invention is contained present international mainstream agreement, comprises TD-SCDMA, WCDMA, CDMA2000 etc.
The alleged WiFi access point 101 of the present invention, containing may implementation to near-end radio-frequency (RF) switch 110 any of transmission WiFi radiofrequency signal of native system.
The alleged 3G interface 102 of the present invention is contained to any possibility implementation of the near-end duplexer 113 transmission 3G radiofrequency signals of native system, includes but not limited to the interface that base station, Remote Radio Unit, repeater etc. provide.
Fig. 2 illustrates the detailed diagram of the near-end node in the exemplary embodiment of the present invention.
Near-end node 103 is made of WiFi radiofrequency signal interface 201,3G radiofrequency signal interface 202, near-end radio-frequency (RF) switch 110, descending mixer 111, electricity/light modular converter (E/O) 210, light/electric modular converter (E/O) 220, near-end duplexer 113, up splitter 114.
Connect WiFi access point (AP) 101 and near-end node 103 by WiFi radiofrequency signal interface 201.WiFi radiofrequency signal interface 201 adopts the SMA interface in the exemplary embodiment of the present invention.
Connect 3G radiofrequency signal processing unit and near-end node 103 by 3G radiofrequency signal interface 202.3G radiofrequency signal interface 202 adopts the SMA interface in the exemplary embodiment of the present invention.
Near-end electricity/light modular converter (E/O) 210 is made of laser 211, optical modulator 212.Electricity/light modular converter (E/O) 210 realization WiFi and the 3G hybrid radio frequency signal of telecommunication are to the conversion of light signal.
Near-end light/electric modular converter (O/E) 220 comprises: photo-detector 223, filter 222, power back-off 221.Light/electric modular converter (O/E) 220 realizes that light signal is to the conversion of rf signal.
Fig. 3 illustrates the detailed diagram of the distant-end node in the exemplary embodiment of the present invention.
Distant-end node 105 is made of electricity/light modular converter (E/O) 310, light/electric modular converter (E/O) 320, power amplifier (PA) 121, low noise amplifier (LNA) 124, up mixer 125, descending splitter 122, far-end duplexer 126, far-end combiner-divider 127 and far end radio frequency switch 123.
Far-end electricity/light modular converter (E/O) 310 is made of laser 311, optical modulator 312.Electricity/light modular converter (E/O) 310 realization WiFi and the 3G hybrid radio frequency signal of telecommunication are to the conversion of light signal.
Far-end light/electric modular converter (O/E) 320 comprises: photo-detector 321, filter 322, power back-off 323.Light/electric modular converter (O/E) 320 realizes that light signal is to the conversion of rf signal.
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 for the signal of telecommunication decay that the compensation signal of telecommunication causes after changing through electricity/light conversion, optical fiber, light/electricity, and power compensating unit both can integrate with any one light/electric modular converter, can integrate with power amplifier 121 again.
Radio-frequency (RF) switch 110 of the present invention is consulted Fig. 4.Radio frequency directive overrurrent relay detection circuit 203 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 respectively state of control switch pipe Q2, Q3 and Q1, Q4.Radio-frequency (RF) switch 123 adopts close circuit with radio-frequency (RF) switch 110, difference is, what the power detection circuit 203 of radio-frequency (RF) switch 110 was surveyed is the power that transmits of incoming end Cx, and the power detection circuit of radio-frequency (RF) switch 123 is the power of the signal of its downstream end of direct detection Tx then.Because radio-frequency (RF) switch 110 and 123 is close, so do not show separately accompanying drawing for radio-frequency (RF) switch 123, those skilled in the art can realize the physical circuit of radio-frequency (RF) switch 123 easily in conjunction with description of the invention and Fig. 4.
The equipment (access point or cover antenna) that connects when incoming end Cx is upper is not when working, and switching tube Q2 and Q3 are closed, and Q1 and Q4 disconnect, and incoming end Cx and upstream ends Rx connect;
When incoming end Cx reception signal, two reverse control signals of drive circuit 402 outputs make switching tube Q2 and Q3 closed, 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 203 outputs through shaping circuit 401 and drive circuit 402, was exported two reverse control signals, made switching tube Q1 and Q4 closed, and Q2 and Q3 disconnect, and incoming end Cx and downstream end Tx connect.
According to the physical circuit of radio-frequency (RF) switch shown in Figure 4, according to the aforesaid concrete annexation of native system, can assist the system of the present invention that realizes.
Above show the bidirectional analog optical fiber transmission system that exemplary embodiment of the present invention provides a kind of WiFi of mixing, 3G signal with being described clearly, this system adopts Radio of Fiber Technology, realizes the half-duplex of WiFi radiofrequency signal, remote fiber distribution.
Distant-end node 105 has used power amplifier (PA) 121, low noise amplifier (LNA) 124 in the exemplary embodiment of the present invention, is used for improving the signal cover of distant-end node 105.When required radiofrequency signal coverage hour, power amplifier (PA) 121 and low noise amplifier (LNA) 124 in the described distant-end node 105 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 realize that WiFi and the hybrid fiber of 3G (TD-SCDMA, WCDMA, CDMA2000) arrange net, also can (hybrid fiber of 2.3GHz~2.4GHz) be arranged net for WiFi and 4G.
Further, enlarge photoelectricity/electrooptic conversion module 112,120 signal bandwidth, can realize that also the hybrid fiber of WiFi and 2G signal is arranged net.
The 3G duplexer adopts the time division duplex device in the exemplary embodiment of the present invention, also can adopt frequency division duplex device, compatible different 3G standards.
By an antenna 106 radiation WiFi and 3G radiofrequency signal, also can connect respectively radio-frequency (RF) switch 123 and 3G duplexer 126 by two antennas in the exemplary embodiment of the present invention, respectively radiation WiFi radiofrequency signal and 3G radiofrequency signal.
Although the above has shown exemplary embodiments more of the present invention, but it should be appreciated by those skilled in the art that, in 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. bidirectional analog optical fiber transmission system that mixes WiFi, 3G signal is used for realizing the long-distance transmissions of the signal of WiFi and 3G signal source it is characterized in that it comprises:
Respectively be arranged at the radio-frequency (RF) switch of near-end and far-end, for one road WiFi signal being separated into down going channel and data feedback channel to realize half-duplex transmission; Respectively be arranged at the duplexer of near-end and far-end, for one road 3G signal being separated into down going channel and data feedback channel to realize full duplex or half-duplex transmission;
Descending mixer is used for and will closes the road to form the down mixing signal from the WiFi signal source and through the WiFi signal of near-end radio-frequency (RF) switch down going channel output with from the 3G signal source and through the 3G signal of the output of near-end duplexer; Descending splitter is used for the down mixing signal is separated into WiFi downstream signal and 3G downstream signal, and the down going channel through far end radio frequency switch and far-end duplexer transmits respectively;
The far-end combiner-divider, be transferred to cover antenna after the 3G downstream signal that is used for when signal downlink WiFi downstream signal and the far-end duplexer of the output of far end radio frequency switch being exported closes the road and finish covering, and the signal that when signal uplink cover antenna is received is separated into WiFi upward signal and 3G upward signal, and the data feedback channel through far end radio frequency switch and far-end duplexer transmits respectively;
Up mixer is used for the WiFi upward signal of far end radio frequency switch output and the 3G upward signal of far-end duplexer output are closed the road to form up mixed signal; Up splitter is used for up mixed signal is separated into WiFi upward signal and 3G upward signal, and the data feedback channel through near-end radio-frequency (RF) switch and near-end duplexer transmits back signal source respectively;
Optical fiber component is connected between descending mixer and the descending splitter, and is connected between up mixer and the up splitter, realizes the transmission of described down mixing signal and described up mixed signal.
2. the bidirectional analog optical fiber transmission system of mixing according to claim 1 WiFi, 3G signal is characterized in that described near-end radio-frequency (RF) switch and/or far end radio frequency switch comprise:
The radio-frequency power detection circuit for the signal power of surveying the radio-frequency (RF) switch down going channel, 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 down going channel of conducting when signal downlink according to this detectable signal; Its data feedback channel of acquiescence conducting when signal uplink.
3. the bidirectional analog optical fiber transmission system of mixing according to claim 1 and 2 WiFi, 3G signal is characterized in that described optical fiber component comprises:
Near-end electricity/light modular converter is used for the down mixing signal of descending mixer output is converted to light signal from the signal of telecommunication; Downlink optical fiber is for the down mixing signal that transmits described light signal form; Far-end light/electric modular converter is used for the down mixing signal of described light signal form is converted to electrical signal form and is transferred to described descending splitter;
Far-end electricity/light modular converter is used for the up mixed signal of up mixer output is converted to light signal from the signal of telecommunication; Uplink optical fibers is for the up mixed signal of transmitting described light signal form; Near-end light/electric modular converter is used for the up mixed signal of described light signal form is converted to electrical signal form and is transferred to described up splitter.
4. the bidirectional analog optical fiber transmission system of mixing WiFi according to claim 3,3G signal is characterized in that: be serially connected with power amplifier between described far-end light/electric modular converter and the far end radio frequency switch, be used for the down mixing signal is amplified.
5. the bidirectional analog optical fiber transmission system of mixing WiFi according to claim 3,3G signal is characterized in that: be serially connected with low noise amplifier between described far end radio frequency switch and the far-end electricity/light modular converter, be used for up mixed signal is amplified.
6. the bidirectional analog optical fiber transmission system of mixing WiFi according to claim 1 and 2,3G signal is characterized in that: described cover antenna employing omnidirectional antenna.
7. the bidirectional analog optical fiber transmission system of mixing according to claim 3 WiFi, 3G signal, it is characterized in that: in described near-end or the far-end, the signal bandwidth of its light/electric modular converter or electricity/light modular converter is confined to any number between 1700MHz~2700MHz.
8. the bidirectional analog optical fiber transmission system of mixing according to claim 3 WiFi, 3G signal, it is characterized in that: described uplink optical fibers and downlink optical fiber are monomode fiber.
9. the bidirectional analog optical fiber transmission system of mixing according to claim 3 WiFi, 3G signal 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. the bidirectional analog optical fiber transmission system of mixing according to claim 3 WiFi, 3G signal 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.
CN2010102131589A 2010-06-24 2010-06-24 Bidirectional analog optical fiber transmission system with mixed WiFi and 3G signals CN101902318B (en)

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CN102739315B (en) * 2011-04-02 2015-04-15 矽玛科技股份有限公司 Hybrid transmission system capable of transmitting signals of different directions
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CN102523035B (en) * 2011-12-15 2015-03-04 成都芯通科技股份有限公司 Method and device for radio-frequency transmission of TDD (Time Division Duplex) switching signal
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
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