CN109818678B - Visible data transceiver terminal - Google Patents
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- CN109818678B CN109818678B CN201910276193.6A CN201910276193A CN109818678B CN 109818678 B CN109818678 B CN 109818678B CN 201910276193 A CN201910276193 A CN 201910276193A CN 109818678 B CN109818678 B CN 109818678B
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Abstract
The invention discloses a kind of visible data transceiver terminals, comprising: protocol interface unit, signal modulation and demodulating unit, signal send driving unit, LED light source, ambient noise light and eliminate unit and photoelectric conversion unit；Protocol interface unit is electrically connected to signal modulation and demodulating unit according to serial port protocol input/output digital signal；Signal modulation and demodulating unit are sent after digital signal is modulated or is demodulated, and at least there are three terminals for tool, and first terminal is input/output terminal, is electrically connected with protocol interface unit；Second terminal is output end, is electrically connected to the input terminal that signal sends driving unit；Third terminal is input terminal, is electrically connected to the output end that ambient noise light eliminates unit；Signal sends driving unit and is electrically connected to LED light source, and photoelectric conversion unit receives the optical signal of LED light source sending, is converted into electric signal；The input terminal that ambient noise light eliminates unit is electrically connected to the output end of photoelectric conversion unit.
Description
Technical field
The present invention relates to technical field of visible light communication, more particularly to a kind of visible light number that can eliminate ambient light interference
According to transceiver terminal.
Background technique
Visible light communication technology, mostly uses greatly white light LEDs as light source, and the signal of communication carried using LED lamplight is direct
The luminous intensity of LED is modulated to transmit information.Concrete implementation mode is driven generally by chip module is implanted into LED light
Dynamic LED issues the high speed light and shade flash signal being invisible to the naked eye, and then uses photoelectric sensor identification signal light in the system of reception
Line, LED, which extinguishes (no signal light), indicates digital " 0 ", and LED lights and (has signal light) expression number " 1 ", is achieved in digital signal
Transmission.
Visible light communication technology needs to consider a large amount of in outer visible light communication indoors using visible light as information carrier
Bias light interference.When encountering the interference of ambient noise light, receiving system cannot be distinguished signal light and noise light, can not analyze
Corresponding " 0 ", " 1 " data, and then influence communication efficiency.Ambient noise mostlys come from caused by natural light, lighting apparatus
Noise light.By analyzing various ambient noises, it can be found that in order to establish an efficient, reliable visible light communication
Receiver system just has to the anti-interference problem for first solving system.
At present in visible light communication technology frequently with ambient light anti-interference method have it is following several:
1, hood is installed additional to receive system light collecting part, the interference light in environment is blocked by hood.
2, increase optically filtering piece；Since visible light communication system mainly uses white light LEDs as emission system light source, institute
After increasing the filter plate for plating 622-770nm, 492-577mm, 435-480nm band logical film in optics receiving front-end, light-receiving system
System only allows three primary colours light to pass through, so that different frequency light in environment be filtered out.
3, increase emission system optical power；Since outdoor environment is complex, it is seen that optical power can be certainly in transmission process
Biggish decaying improves emission system power, can increase the signal-to-noise ratio of optical receiving system in specific environment, reduces communication
The bit error rate.
However, currently used ambient light anti-interference method has the disadvantage that
1, hood is installed additional to receive system light collecting part:
This mode can only block the part interference light in environment, can not filter environment noise light line completely, and
The signal light range of receiving of reception system can be reduced.
2, increase optically filtering piece:
This mode can only reduce bias light interference to a certain extent, can not filter environment noise light line completely；And
Band pass filter cost costly, can greatly promote Related product cost.In addition, this scheme is in order to by different frequency in environment
Light filters out, and only the light of band segment is allowed to pass through, this requires the photoelectric sensors in reception system equally to work right
It answers in frequency range, this reduces products to the range of choice of sensor component, improves product cost indirectly.
3, increase emission system optical power, improve signal-to-noise ratio:
Firstly, improving emission system power need that product cost can be promoted using more powerful driving chip；Secondly,
Many application scenarios of visible light communication technology require to realize wireless light communication on the basis of not influencing LED illumination, excessively high
Ground improves emission system power, increase LED luminance may have certain influence to illumination.That is, increasing the side of optical receiving system
On the one hand case makes optical system cost costly, on the other hand can also reduce the optical signal range of receiving of reception system.
Summary of the invention
In order to overcome the drawbacks of the prior art, the technical problems to be solved by the present invention are: how to better solve visible
Ambient light interference problem in optical communication technique application.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
Visible data transceiver terminal, comprising: protocol interface unit, signal modulation and demodulating unit, signal send driving
Unit, LED light source/laser light source, ambient noise light eliminate unit and photoelectric conversion unit, wherein
The protocol interface unit is used for according to serial port protocol input/output digital signal, the protocol interface unit electricity
It is connected to the signal modulation and demodulating unit and mutually passes digital signal with the signal modulation and demodulating unit；
The signal modulation is with demodulating unit for sending after digital signal is modulated or is demodulated；The signal
Modulation and demodulation unit at least has there are three terminal, and first terminal is input/output terminal, is used for and protocol interface unit electricity
Connection；Second terminal is output end, and the input terminal of driving unit is sent for being electrically connected to the signal；Third terminal is input
The output end of unit is eliminated at end for being electrically connected to the ambient noise light；
The signal sends driving unit for driving LED light source/laser light source, and output end is electrically connected to the LED
Light source/laser light source；LED light source/the laser light source is for converting electrical signals to optical signal, issuing；The photoelectric conversion
Unit is used to receive the optical signal that the LED light source/laser light source issues, and converts optical signal into electric signal；The background is made an uproar
The input terminal that acousto-optic eliminates unit is electrically connected to the output end of the photoelectric conversion unit；
The ambient noise light is eliminated in unit and is equipped with phase integral circuit, by being filtered to electric signal, indirectly
Direct current light and frequency 1KHz noise light below in filtering environmental；
The same phase integral circuit includes: operational amplifier U1A and U1B, resistance R1~R9, capacitor C1~C4 and compares
Device U2, wherein photoelectric sensor is equipped in the photoelectric conversion unit being electrically connected with the same phase integral circuit；With the light
The first end electrical connection of electric transducer has: the first end of resistance R1, the first end of resistance R2, the first end of capacitor C1, capacitor
The first end of C2, the first end of capacitor C4, the non-inverting input terminal of the non-inverting input terminal of operational amplifier U1A and comparator U2,
Have with what the second end of the photoelectric sensor was electrically connected: the first end of resistance R3, the first end of resistance R4, resistance R5 first
The inverting input terminal at end, the first end of capacitor C3 and operational amplifier U1A；The second end of resistance R1 and the second end of capacitor C1
It is all electrically connected to power Vcc, the second end of the second end of resistance R2, the second end of resistance R4 and capacitor C2 is grounded, resistance R3's
The output end of second end, the second end of capacitor C3 and operational amplifier U1A is all electrically connected to the reverse input end of comparator U2,
The first end of the second end of capacitor C4, the first end of resistance R6 and resistance R9 is respectively electrically connected to the same of operational amplifier U1B
Phase input terminal, the second end of resistance R9 are electrically connected to the second end of resistance R5, and the second end of resistance R6 is electrically connected to comparator U2
Reverse input end, the reverse phase that the first end of resistance R7 and the first end of resistance R8 are respectively electrically connected to operational amplifier U1B is defeated
Enter end, the second end of resistance R8 is electrically connected to the second end of resistance R5, and the second end of resistance R7 is electrically connected to the same of comparator U2
Phase input terminal, the output end of operational amplifier U1B are electrically connected to the second end of resistance R5, and the output end of comparator U2 is electrically connected to
The third terminal of the signal modulation and demodulating unit.
Based on the above technical solution, the present invention can also be improved as follows.
Optionally, the photoelectric sensor is photodiode, silicon photocell or phototriode.
Preferably, optical antenna is provided at the LED light source/laser light source.
Preferably, the LED light source/laser light source is blue-green, is used for subsurface communication after installing waterproof case additional.
Preferably, OOK modulation-demodulation circuit is equipped in the signal modulation and demodulating unit.
Compared with prior art, the present invention has the following technical effect that
1, anti-jamming effectiveness is best: the scheme that the present invention uses, and can exclude direct current light and 1KHz exchange light below
Line interference, can filter the daylight of environment noise light line, the lighting sources such as indoor incandescent lamp, fluorescent lamp and outdoor completely substantially
Communication capacity of the invention will not be had an impact；
2, low in cost: relative to the schemes such as increase bandpass filter, optical lens system, the increased cost of present invention institute
It is very cheap；
3, to visible light communication system without extra demand: such as to the sensor light acquisition range of the system of reception without wanting
It asks, more will not influence LED illumination effect；
4, highly sensitive using full-duplex communication mode, it can be in horizontal distance 5 in the case where extra optical equipment is not added
Rice and 1 meter of vertical missing in the case where realize communication.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of visible data transceiver terminal of the invention；
Fig. 2 is the circuit diagram in ambient noise light elimination unit of the invention with phase integral circuit.
In the accompanying drawings, list of designations represented by each label is as follows:
1 --- protocol interface unit；2 --- signal modulation and demodulating unit；3 --- signal sends driving unit；4——
LED light source/laser light source；5 --- ambient noise light eliminates unit；6 --- photoelectric conversion unit.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
It please refers to shown in Fig. 1, is the structural schematic diagram of visible data transceiver terminal of the invention.The visible light number
It include: protocol interface unit 1, signal modulation and demodulating unit 2, signal transmission driving unit 3, LED light source/swash according to transceiver terminal
Radiant 4, ambient noise light eliminate unit 5 and photoelectric conversion unit 6, wherein
The protocol interface unit 1 is used for according to serial port protocol input/output digital signal, the protocol interface unit 1
It is electrically connected to the signal modulation and demodulating unit 2 and mutually passes digital signal with the signal modulation and demodulating unit 2；
The signal modulation and demodulating unit 2 are used to that digital signal to be modulated or be demodulated according to OOK adjustment method, then
It sends；The signal modulation and demodulating unit 2 at least haves that there are three terminals, and first terminal is input/output terminal, be used for
The protocol interface unit 1 is electrically connected；Second terminal is output end, sends driving unit 3 for being electrically connected to the signal
Input terminal；Third terminal is input terminal, and the output end of unit 5 is eliminated for being electrically connected to the ambient noise light, described as a result,
Signal modulation and 2 one side of demodulating unit, which are used to for modulated digital signal to be sent to the signal, sends driving unit 3, separately
On the one hand it is demodulated for eliminating the digital signal that unit 5 is sent to the ambient noise light；
The signal sends driving unit 3 for driving LED light source, and output end is electrically connected to the LED light source/laser
Light source 4；LED light source/the laser light source 4 is for converting electrical signals to optical signal, issuing；The photoelectric conversion unit 6 is used
In the optical signal for receiving the sending of LED light source/laser light source 4, electric signal is converted optical signal into；The ambient noise light disappears
Except the input terminal of unit 5 is electrically connected to the output end of the photoelectric conversion unit 6, the ambient noise light is eliminated to be set in unit 5
There is same phase integral circuit, by being filtered to electric signal, direct current light and frequency 1KHz noise light below in filtering environmental indirectly
Line.
Preferably, it is provided with optical antenna at the LED light source/laser light source, can be greatly increased after installing optical antenna additional
Communication distance.
Preferably, the LED light source/laser light source selects blue-green, is used for subsurface communication after installing waterproof case additional.
Referring again to shown in Fig. 2, the circuit diagram in unit with phase integral circuit is eliminated for ambient noise light of the invention；
The same phase integral circuit includes: operational amplifier U1A and U1B, resistance R1~R9, capacitor C1~C4 and comparator U2,
In,
Photoelectric sensor, specifically, institute are equipped in the photoelectric conversion unit 6 being electrically connected with the same phase integral circuit
Stating photoelectric sensor may be, for example, photodiode (PD) or phototriode (PT) etc., used in Fig. 2 PD as label only
It is to be not intended as limiting to illustrate；Have with what the first end of the photoelectric sensor was electrically connected: the first end of resistance R1, electricity
Hinder the first end of R2, the first end of capacitor C1, the first end of capacitor C2, the first end of capacitor C4, the same phase of operational amplifier U1A
The non-inverting input terminal of input terminal and comparator U2 has with what the second end of the photoelectric sensor was electrically connected: the of resistance R3
One end, the first end of resistance R4, the first end of resistance R5, the first end of capacitor C3 and operational amplifier U1A anti-phase input
End；The second end of resistance R1 and the second end of capacitor C1 are all electrically connected to power Vcc, and the of the second end of resistance R2, resistance R4
The second end of two ends and capacitor C2 ground connection, the output of the second end of resistance R3, the second end of capacitor C3 and operational amplifier U1A
End is all electrically connected to the reverse input end of comparator U2, and the of the second end of capacitor C4, the first end of resistance R6 and resistance R9
One end is respectively electrically connected to the non-inverting input terminal of operational amplifier U1B, and the second end of resistance R9 is electrically connected to the second of resistance R5
End, the second end of resistance R6 are electrically connected to the reverse input end of comparator U2, the first end of resistance R7 and the first end of resistance R8
It is respectively electrically connected to the inverting input terminal of operational amplifier U1B, the second end of resistance R8 is electrically connected to the second end of resistance R5, electricity
The second end of resistance R7 is electrically connected to the non-inverting input terminal of comparator U2, and the output end of operational amplifier U1B is electrically connected to resistance R5
Second end, the output end of comparator U2 is electrically connected to the third terminal of the signal modulation Yu demodulating unit 2.
R1, R2, C1, C2 provide the stable reference ground voltage that a voltage is VCC/2 as a result,.Amplifier U1A, R3, C3 structure
At transreactance amplifier, the value of feedback resistance R3 determines the gain of analog portion, and feedback capacity C3 can inhibit oscillation.Amplifier
U1B, R6, R7, R8, R9, C4 constitute noninverting integrator.For general Transimpedance amplifier be often difficult to take into account it is highly sensitive and
Wide dynamic range: if the high gain of circuit, high sensitivity, circuit is easily saturated under strong light；Conversely, if it is desired to can be strong
Signal is detected under bias light, then circuit gain must reduce.This circuit design uses this integrator design, realizes to photoelectric current
The active absorption of DC component.Meanwhile this integrator is but also entire circuit has high pass characteristic, so that the direct current in environment
Light and common Hz noise light (such as daylight light) can obtain very effective inhibition.
The present invention realizes the wireless transmission communication of digital signal by the way of visible light communication.Pass through serial acquisition user
Data are based on OOK modulation system, by driving LED light source/laser light source light on and off to become after signal processing unit modulation treatment
Change, transmitting visible light signal: when LED/ laser light source is illuminating state, indicating digital signal " 1 ", when LED/ laser light source is
It when OFF state, indicates digital signal " 0 ", digital signal is transmitted by the quick light and shade flashing of LED light source/laser light source.
Optical signal is sent to number of users on serial ports using demodulation with enhanced processing later after being received by photoelectric sensor (PD)
According to reduction.Communication mode of the invention is for duplex communication, it can be achieved that the bidirectional data transmission function of transceiver.
Visible data transceiver terminal (VLC-901D) of the invention be it is a based on visible light communication technology without line number
According to communication equipment, digital signal is transmitted by the flashing of driving LED lamp bead high speed light and shade.Product environment resistant light with super strength
Interference function, antificielle light source and will not have an impact communication capacity in outdoor sunray.Product communication mode tool
There is the features such as electromagnetic-radiation-free, secret and safe, positioning transceiving.It can be applicable to the occasion sensitive to electromagnetic signal, such as aircraft, doctor
Under institute, mine, Industry Control etc..It can apply in the concerning security matters units such as military-political, can be used for the inaccessiable water of radiofrequency signal
Lower communication scenes.The blank of these application fields wireless communication can be made up.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. visible data transceiver terminal characterized by comprising protocol interface unit, signal modulation and demodulating unit, signal
It sends driving unit, LED light source/laser light source, ambient noise light and eliminates unit and photoelectric conversion unit, wherein
The protocol interface unit is used for according to serial port protocol input/output digital signal, the protocol interface unit electrical connection
Digital signal is mutually passed to the signal modulation and demodulating unit and with the signal modulation and demodulating unit；
The signal modulation is with demodulating unit for sending after digital signal is modulated or is demodulated；The signal modulation
Terminal there are three at least having with demodulating unit, first terminal is input/output terminal, for being electrically connected with the protocol interface unit
It connects；Second terminal is output end, and the input terminal of driving unit is sent for being electrically connected to the signal；Third terminal is input
The output end of unit is eliminated at end for being electrically connected to the ambient noise light；
The signal sends driving unit for driving LED light source/laser light source, output end be electrically connected to the LED light source/
Laser light source；LED light source/the laser light source is for converting electrical signals to optical signal, issuing；The photoelectric conversion unit is used
In receiving the LED light source/laser light source sending optical signal, electric signal is converted optical signal into；The ambient noise light disappears
Except the input terminal of unit is electrically connected to the output end of the photoelectric conversion unit；
The ambient noise light is eliminated to be equipped in unit and be filtered out indirectly with phase integral circuit by being filtered to electric signal
Direct current light and frequency 1KHz noise light below in environment；
The same phase integral circuit includes: operational amplifier U1A and U1B, resistance R1~R9, capacitor C1~C4 and comparator
U2, wherein
Photoelectric sensor is equipped in the photoelectric conversion unit being electrically connected with the same phase integral circuit；
Have with what the first end of the photoelectric sensor was electrically connected: the first end of resistance R1, the first end of resistance R2, capacitor C1
First end, the first end of capacitor C2, the first end of capacitor C4, the non-inverting input terminal of operational amplifier U1A and comparator U2
Non-inverting input terminal has with what the second end of the photoelectric sensor was electrically connected: the first end of resistance R3, the first end of resistance R4,
The inverting input terminal of the first end of resistance R5, the first end of capacitor C3 and operational amplifier U1A；The second end and electricity of resistance R1
The second end for holding C1 is all electrically connected to power Vcc, the second termination of the second end of resistance R2, the second end of resistance R4 and capacitor C2
The output end on ground, the second end of resistance R3, the second end of capacitor C3 and operational amplifier U1A is all electrically connected to comparator U2's
Reverse input end, the first end of the second end of capacitor C4, the first end of resistance R6 and resistance R9 are respectively electrically connected to operation and put
The non-inverting input terminal of big device U1B, the second end of resistance R9 are electrically connected to the second end of resistance R5, the second end electrical connection of resistance R6
To the reverse input end of comparator U2, the first end of resistance R7 and the first end of resistance R8 are respectively electrically connected to operational amplifier
The inverting input terminal of U1B, the second end of resistance R8 are electrically connected to the second end of resistance R5, and the second end of resistance R7 is electrically connected to ratio
Compared with the non-inverting input terminal of device U2, the output end of operational amplifier U1B is electrically connected to the second end of resistance R5, the output of comparator U2
End is electrically connected to the third terminal of the signal modulation and demodulating unit.
2. visible data transceiver terminal according to claim 1, which is characterized in that the photoelectric sensor is photoelectricity two
Pole pipe, silicon photocell or phototriode.
3. visible data transceiver terminal according to claim 1, which is characterized in that at the LED light source/laser light source
It is provided with optical antenna.
4. visible data transceiver terminal according to claim 1, which is characterized in that the LED light source/laser light source is
Blue-green is used for subsurface communication after installing waterproof case additional.
5. visible data transceiver terminal according to claim 1, which is characterized in that the signal modulation and demodulating unit
In be equipped with OOK modulation-demodulation circuit.
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| CN205179051U (en) * | 2015-12-02 | 2016-04-20 | 贵州省计量测试院 | Visible light communication's fast signal restore circuit |
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| CN100344084C (en) * | 2005-04-25 | 2007-10-17 | 南京大学 | Device for conducting position detection using modulation light beam and detection method |
| CN103546214A (en) * | 2013-10-19 | 2014-01-29 | 西安邮电大学 | Image communication system based on visible light |
| CN104980217B (en) * | 2015-06-19 | 2017-12-19 | 邹骁 | A kind of visible light communication system, method and relevant device |
| CN205005324U (en) * | 2015-10-22 | 2016-01-27 | 中国计量学院 | Eliminate photoelectricity receiving sensor background light influences's circuit |
| CN205407826U (en) * | 2016-03-08 | 2016-07-27 | 深圳光启智能光子技术有限公司 | Light is made an uproar and is got rid of circuit and optical receiver |
| CN107888295A (en) * | 2017-12-29 | 2018-04-06 | 江苏世杰光电有限公司 | A kind of dim light communication control processor and communication means based on photon counting |
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| CN205179051U (en) * | 2015-12-02 | 2016-04-20 | 贵州省计量测试院 | Visible light communication's fast signal restore circuit |
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