CN209046647U - A kind of double detector visible light communication noise reduction system - Google Patents
A kind of double detector visible light communication noise reduction system Download PDFInfo
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- CN209046647U CN209046647U CN201821888297.XU CN201821888297U CN209046647U CN 209046647 U CN209046647 U CN 209046647U CN 201821888297 U CN201821888297 U CN 201821888297U CN 209046647 U CN209046647 U CN 209046647U
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- detector
- operational amplifier
- visible light
- signal
- amplifying circuit
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Abstract
The utility model relates to a kind of double detector visible light communication noise reduction system, system includes main auxiliary detector, across resistance amplifying circuit and high cmrr operational amplification circuit；The optical information with target information is received using main detector and with the optical information of interference information, auxiliary detector only receives the optical information with interference information；Detector carries out photoelectric conversion to the optical information received respectively, exports photoproduction current signal respectively；Amplify after two-way photogenerated current signal is separately converted to voltage signal；It is eliminated to there is the interference signal with interference information in two paths of signals jointly；Receive the signal for having target information.It solves the problems, such as that luminous environment locating for receiving end influences main signal there are multi-frequency modulation light and receives, for the visible light signal of different frequency modulation, generates the visible light communication under overlapping situation in the same area range and provide solution.Suitable for all kinds of scenes, i.e., high speed and low speed optical signal be closer and farther away scene.
Description
Technical field
The utility model relates to a kind of double detector visible light communication noise reduction system, the espespecially communications of visible light spectrum.
Background technique
Radio Spectrum Resource is abnormal crowded, expands visible light frequency band, realizes wireless optical using ubiquitous LED
Communication, is strategic development demand.
The visible light communication of OOK modulation system at present is surfed the Internet in LIFI household, and the scene of family multi-media transmission can reach
100Mbps transmission rate.But also need to control electrical equipment in many scenes, the demand of monitoring device etc., these controls only need
One relatively low speed carries out instruction and sends and receives.Tens, several hundred Kbps low speed receiving modules are in cost,
All far below the demand under high-speed module design in complexity.And the visible light communication receiving end of OOK modulation at present, if simultaneously
Have received high low speed signal then can not analytic signal, so needing high speed visible light signal and low speed visible light signal visible
Optic communication receiving end is completely isolated.
However, illuminate and communicated in multiplexing scene in actual needs, it can not two kinds of optical signals are completely isolated, it uses
It is extremely inconvenient.Settling mode in application at present, first, being that low speed signal is also carried out by High Speed Modulation mode by Software Coding
Transmission, and demand of the high speed receiving module in cost, under all being designed much higher than low-speed module in complexity.Second, be will be high
Speed and low speed light source are spatially completely isolated, are unable to satisfy needs high speed and the closer scene of low speed optical signal again in this way, such as
Simultaneously, another lamp sends low speed instruction control household electrical appliance again for a lamp high speed LIFI online in bedroom, and the two can generate
It interferes with each other, especially interference of the low speed signal to high speed signal also can be considered a noise like.
Utility model content
It is mutual in order to high speed visible light signal at effective and inexpensive solution receiving end and low speed visible light signal
The problem of interference, the utility model proposes a kind of double detector visible light communication noise reduction systems, are suitable for all kinds of scenes, i.e. high speed
The closer and farther away scene with low speed optical signal.
The technical solution of the utility model is to provide a kind of double detector visible light communication noise reduction system, including receives
End, electricity can also be amplified across resistance across resistance amplifying circuit, second including main detector, auxiliary detector, first by being characterized in that
Road and high cmrr operational amplification circuit；The output end of above-mentioned main detector meets Gao Gongmo across resistance amplifying circuit by first
Inhibit the first input end than operational amplification circuit；The output end of above-mentioned auxiliary detector connects height across resistance amplifying circuit by second
Second input terminal of common-mode rejection ratio operational amplification circuit；The output end of above-mentioned high cmrr operational amplification circuit and reception
End is connected；
Above-mentioned main detector is located within the scope of main signal light radiation, receives main signal and part interference signal, above-mentioned
Auxiliary detector deviates main signal light radiation range, primary recipient interference signal.Two paths of signals is passed through across resistance amplifying circuit, into height
Common-mode rejection ratio amplifying circuit, output are the difference of the two, thus efficiently separate out by interference signal.
Further, above-mentioned high cmrr operational amplification circuit includes the first operational amplifier, the second operation amplifier
Device and differential operational amplifier, the input terminal of above-mentioned first output the first operational amplifier of termination across resistance amplifying circuit are above-mentioned
Second across resistance amplifying circuit output termination second operational amplifier input terminal, the output end of above-mentioned first operational amplifier with
The non-inverting input terminal of differential operational amplifier connects, the output end of above-mentioned second operational amplifier and differential operational amplifier it is anti-
The connection of phase input terminal, the output end of above-mentioned differential operational amplifier are connected with receiving end.
Further, above-mentioned main detector and auxiliary detector are PIN detector.
Further, described first is by low input impedance, high speed across resistance amplifying circuit across resistance amplifying circuit and second
Electric current turn voltage TIA amplifier composition, such as: be made of ADA4899 across resistance amplifying circuit.
Further, the first operational amplifier and second operational amplifier are high input impedance, low noise operational amplification
Device, such as: ADA4899 operational amplifier, differential operational amplifier are ADA4937 operational amplifier.
First and second operational amplifier is the operational amplifier of high gain-bandwidth product.
The beneficial effects of the utility model are:
1, the utility model is in the visible light communication scene that OOK is modulated, from receiving end separation high speed visible light signal and
The design of low speed visible light signal is set out, and in receiving end, setting two-way detector receives primary and secondary signal, and passes through high cmrr
Amplifying circuit carries out the isolation of primary and secondary signal, and solving luminous environment locating for receiving end, there are multi-frequency modulation lights to influence main letter
Number receive the problem of, for different frequency modulation visible light signal, the same area range generate overlapping situation under visible light
Communication provides solution.
2, only need two-way detection system that the separation of high speed visible light signal and low speed visible light signal, operation side can be realized
Just, at low cost.
3, the utility model effectively improves visible light communication to the anti-interference ability of environment light, reduces the bit error rate, is promoted
Traffic rate.
Detailed description of the invention
Fig. 1 is the block diagram of transmitting terminal in embodiment；
Fig. 2 is the block diagram of receiving end in embodiment.
Specific embodiment
The utility model is further described below in conjunction with drawings and the specific embodiments.
Such as Fig. 1, transmitting terminal includes target signal source and interference signal source, and echo signal is modulated onto tool through overmodulated circuit
Have on the first LED light emitting source of certain modulation bandwidth, interference signal is modulated onto through overmodulated circuit with certain modulation bandwidth
The 2nd LED light emitting source on.The visible light of transmitting carrying target information after first LED light emitting source is modulated by echo signal, second
LED light emitting source is disturbed signal modulation, and transmitting carries the visible light of interference information.
Such as Fig. 2, receiving end include main detector, auxiliary detector, first across resistance amplifying circuit, second across resistance amplifying circuit
And high cmrr operational amplification circuit；The output end of main detector is connect with the first input terminal across resistance amplifying circuit, auxiliary
The output end of detector is helped to connect with the second input terminal across resistance amplifying circuit；High cmrr operational amplification circuit includes the
One operational amplifier, second operational amplifier and differential operational amplifier, first the first fortune of output termination across resistance amplifying circuit
The input terminal of amplifier, the input terminal of the second output termination second operational amplifier across resistance amplifying circuit are calculated, the first operation is put
The non-inverting input terminal of the output termination differential operational amplifier of big device, the output termination calculus of differences amplification of second operational amplifier
The output end of the inverting input terminal of device, differential operational amplifier is connected with receiving end.Main detector is located at echo signal radiation model
In enclosing, auxiliary detector deviates echo signal radiation scope.
Main detector and auxiliary detector are PIN detector in the present embodiment, first across resistance amplifying circuit and second across
Amplifying circuit is hindered by low input impedance, and high speed electric current turns voltage TIA amplifier composition, and first across resistance amplification electricity in the present embodiment
Road is to be made of ADA4899 across resistance amplifying circuit across resistance amplifying circuit with second.First operational amplifier is put with the second operation
Big device is by high input impedance, low noise operational amplifier composition.The first operational amplifier of the present embodiment and the second operation amplifier
Device uses ADA4899 operational amplifier, and differential operational amplifier is ADA4937 operational amplifier.
In conjunction with Fig. 1 and Fig. 2, main detector receives the optical information with target information that the first LED light emitting source issues, while again
The optical information with interference information of the 2nd LED light emitting source sending is had received, auxiliary detector only receives the 2nd LED light emitting source
The optical information with interference information issued, main detector and auxiliary detector carry out photoelectric conversion to the optical signal received,
Respectively output photoproduction current signal to first across resistance amplifying circuit and auxiliary across resistance amplifying circuit, first across resistance amplifying circuit and auxiliary
Help across resistance amplifying circuit pass through respectively sampling resistor by main detector and auxiliary detector output current signal be converted into voltage
Signal realizes level amplification using level-one amplifier；Amplified voltage signal enters high cmrr amplifying circuit, into
The same phase and inverting input terminal that differential amplifier circuit is respectively enterd after the secondary amplification of row inhibit common mode component, i.e., common to the two
Existing interference signal is eliminated, output echo signal to receiving end.
Claims (5)
1. a kind of double detector visible light communication noise reduction system, including receiving end, it is characterised in that: further include main detector, auxiliary
Help detector, first across resistance amplifying circuit, second across resistance amplifying circuit and high cmrr operational amplification circuit；The main spy
The output end for surveying device connects the first input end of high cmrr operational amplification circuit by first across resistance amplifying circuit；It is described auxiliary
The output end of detector is helped to connect the second input terminal of high cmrr operational amplification circuit across resistance amplifying circuit by second；Institute
The output end for stating high cmrr operational amplification circuit is connected with receiving end；
The main detector is located within the scope of main signal light radiation, and the auxiliary detector deviates main signal light radiation range.
2. double detector visible light communication noise reduction system according to claim 1, it is characterised in that: the high common mode inhibition
It include the first operational amplifier, second operational amplifier and differential operational amplifier than operational amplification circuit, described first across resistance
The input terminal of output the first operational amplifier of termination of amplifying circuit, described second the second fortune of output termination across resistance amplifying circuit
The input terminal of amplifier is calculated, the output end of first operational amplifier and the non-inverting input terminal of differential operational amplifier connect,
The output end of the second operational amplifier and the inverting input terminal of differential operational amplifier connect, the differential operational amplifier
Output end be connected with receiving end.
3. double detector visible light communication noise reduction system according to claim 2, it is characterised in that: the main detector with
Auxiliary detector is PIN detector.
4. double detector visible light communication noise reduction system according to claim 2, it is characterised in that: described first puts across resistance
Big circuit is to be made of ADA4899 across hindering amplifying circuit across resistance amplifying circuit with second.
5. double detector visible light communication noise reduction system according to claim 2, it is characterised in that: the first operational amplifier
It is all made of ADA4899 operational amplifier with second operational amplifier, differential operational amplifier is ADA4937 operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821888297.XU CN209046647U (en) | 2018-11-15 | 2018-11-15 | A kind of double detector visible light communication noise reduction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821888297.XU CN209046647U (en) | 2018-11-15 | 2018-11-15 | A kind of double detector visible light communication noise reduction system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209046647U true CN209046647U (en) | 2019-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821888297.XU Expired - Fee Related CN209046647U (en) | 2018-11-15 | 2018-11-15 | A kind of double detector visible light communication noise reduction system |
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| Country | Link |
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| CN (1) | CN209046647U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327259A (en) * | 2018-11-15 | 2019-02-12 | 中国科学院西安光学精密机械研究所 | A kind of double detector visible light communication noise-reduction method and system |
-
2018
- 2018-11-15 CN CN201821888297.XU patent/CN209046647U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327259A (en) * | 2018-11-15 | 2019-02-12 | 中国科学院西安光学精密机械研究所 | A kind of double detector visible light communication noise-reduction method and system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190628 Termination date: 20211115 |
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| CF01 | Termination of patent right due to non-payment of annual fee |