CN104270196B - A kind of visible light communication system and method based on reflection - Google Patents
A kind of visible light communication system and method based on reflection Download PDFInfo
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- CN104270196B CN104270196B CN201410582633.8A CN201410582633A CN104270196B CN 104270196 B CN104270196 B CN 104270196B CN 201410582633 A CN201410582633 A CN 201410582633A CN 104270196 B CN104270196 B CN 104270196B
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Abstract
A kind of visible light communication system and method based on reflection, it is related to LED-based optical communication field, including carrying out mobile terminal and the incoming end of two-way communication, incoming end includes the first receiving unit and the first transmitting element, first transmitting element is sent to mobile terminal for data to be sent are converted to downlink optical signal, first receiving unit is used for receiving the uplink optical signal from mobile terminal, and is converted to the corresponding signal of telecommunication；Mobile terminal includes the second transmitting element, wavelength division multiplexer, the second receiving unit, collimating lens, collimating lens are used for focusing on and collimating upper and lower traveling optical signal, wavelength division multiplexer is used for leaching downlink optical signal transmission uplink optical signal, second transmitting element is used for the light for modulating data on up radio frequency channel wavelength, and the mode using reflection is transmitted to wavelength division multiplexer, the downlink optical signal that the second receiving unit is used for leaching wavelength division multiplexer is converted to the signal of telecommunication.
Description
Technical field
The present invention relates to LED-based optical communication field, in particular to a kind of visible light communication system based on reflection
System and method.
Background technology
LED (Lighting Emitting Diode) is referred to as forth generation lighting source or green light source, indoor providing
Apply also in radio optical communication system while illumination.
Under conditions of illumination and data communication is taken into account, simultaneously as information source and light source, data are from fixed and arranged for LED
To user's broadcast transmission (down direction) at LED.But when user data passes back to LED (on up direction), due to transmitting-receiving two
End is difficult to be accurately aimed at, if mobile terminal upstream data is launched upwards by LED, equipment can produce a large amount of dazzles, fixed access point
The uplink signal strength that receives is low and there is substantial amounts of crosstalk.Therefore, it is seen that optic communication lacks reasonable and practical up always
Channel solution, limits its reliable two-way communication.
For solving this problem, multiple up channel schemes have been proposed.For example up employing infrared transmission, although infrared
Light beam has preferable directivity, but remains a need for manually or automatically being aligned to ensure that up infrared beam alignment receiving terminal, this
The downstream transmission scheme of mixing is still complex and high cost.Another kind of scheme adopts the wireless technology uplink such as wifi, but
Due to having used wireless technology, it is little that the communication system of this mixing loses the signal security of visible light communication, spectral interference
Advantage.Therefore, it is seen that especially uplink scheme is the current difficult point that realizes to the transmitted in both directions of optic communication.
Content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of visible light communication based on reflection
System and method, simplify the hardware designs of user terminal, reduce energy resource consumption, and reduces cost saves receiving terminal light source simultaneously
Simplify signal transmitting registration mechanism.
For reaching object above, the present invention provides a kind of visible light communication system based on reflection, including carrying out two-way
The mobile terminal of letter and incoming end, incoming end include the first receiving unit and the first transmitting element, and the first transmitting element will be for will treat
Transmission data are converted to downlink optical signal and send to mobile terminal, and the first receiving unit is used for receiving the up light letter from mobile terminal
Number, and be converted to the corresponding signal of telecommunication；Mobile terminal includes the second transmitting element, wavelength division multiplexer, the second receiving unit, collimation thoroughly
Mirror, collimating lens are used for focusing on and collimating upper and lower traveling optical signal, and wavelength division multiplexer is used for leaching downlink optical signal and transmission is up
Optical signal, the second transmitting element are used for modulating data on the light of up radio frequency channel wavelength, and using reflection mode transmit to
Wavelength division multiplexer, the downlink optical signal that the second receiving unit is used for leaching wavelength division multiplexer are converted to the signal of telecommunication.
On the basis of above-mentioned technical proposal, the mobile terminal is located in the mobile device of user side, and incoming end is located at and builds
At lighting source in building, as fixed access point.
On the basis of above-mentioned technical proposal, first receiving unit includes light receiving unit and the first data receiver list
Unit, light receiving unit are used for receiving the uplink optical signal from mobile terminal, and are converted into the signal of telecommunication；First data receipt unit is used
In the demodulation signal of telecommunication, and the data for demodulating are sent into network.
On the basis of above-mentioned technical proposal, first transmitting element includes light transmitting element and the first data is activation list
Unit, the first data transmission unit receive the data for carrying out automatic network, and light transmitting element includes LED and its drive circuit, for by institute
State data and be converted to downlink optical signal and send.
On the basis of above-mentioned technical proposal, second receiving unit includes the second data receipt unit and optical detection
Device, photo-detector are used for detecting the downlink optical signal that wavelength division multiplexer is leached, and are converted to electric signal output and connect to the second data
Receive unit.
On the basis of above-mentioned technical proposal, second transmitting element includes the second data transmission unit, reflection type optical
Manipulator and corner reflector, and reflective light modulators are located at the reflecting surface of corner reflector；Second data transmission unit is used for sending out
Data, reflective light modulators are sent to be used for the light of the data modulation of the second data transmission unit to up radio frequency channel wavelength, angle
Reflector is by uplink optical signal reflected in parallel to wavelength division multiplexer.
On the basis of above-mentioned technical proposal, second transmitting element includes the second data transmission unit, transmission-type light
Manipulator and corner reflector, transmission-type photomodulator are located between corner reflector and wavelength division multiplexer, the second data transmission unit
For sending data to transmission-type photomodulator, the light of the up radio frequency channel wavelength that wavelength division multiplexer is leached by corner reflector is reflected back
Go, after transmission-type photomodulator modulates data on the light of up radio frequency channel wavelength, form uplink optical signal and be sent to wavelength-division multiplex
Device.
On the basis of above-mentioned technical proposal, second transmitting element includes the second data transmission unit, reflection type optical
Manipulator and focus device, focus device are located between reflective light modulators and wavelength division multiplexer, and focus device is used for ripple
The light of the up radio frequency channel wavelength that division multiplexer is leached focuses on reflective light modulators, and the second data transmission unit is used for sending number
According to reflective light modulators are given, after reflective light modulators modulate data on the light of up radio frequency channel wavelength, up light letter is formed
Number line focus device is sent to wavelength division multiplexer.
The present invention also provides a kind of visible light communication method based on reflection, and down direction, the first transmitting element will be pending
Send data to be converted to downlink optical signal to send to mobile terminal, by the incoming wavelength division multiplexer of collimating lens, wavelength division multiplexer is leached
The light and downlink optical signal of not modulated up radio frequency channel wavelength, downlink optical signal are sent to the second receiving unit, and second connects
Receiving unit carries out opto-electronic conversion to downlink optical signal；Data waiting for transmission are loaded into up by up direction, the second transmitting element
The light modulation of radio frequency channel wavelength is into uplink optical signal, and the mode using reflection is transmitted to wavelength division multiplexer, wavelength division multiplexer transmission
Uplink optical signal to be sent, and sent by collimating lens to the first receiving unit of incoming end, the first receiving unit is to upper
After traveling optical signal carries out opto-electronic conversion, network is sent into.
The beneficial effects of the present invention is：Visible light communication system and method based on reflection, is only had using incoming end
Single light source, mobile terminal do not have light source, and mobile terminal is realized between incoming end by reflecting receiving light and modulating upstream data
Simple and reliable uplink communication links, simplify the hardware designs of user terminal, achieve two-way different ripples based on wavelength-division technology
Long data transfer；Receiving terminal light source is saved, energy resource consumption, reduces cost is reduced.
Description of the drawings
Fig. 1 is block diagram of the present invention based on the visible light communication system first embodiment of reflection；
Fig. 2 is the distribution schematic diagram of visible light of the present invention；
Fig. 3 is the structural representation of mobile terminal first embodiment of the present invention；
Fig. 4 is the structural representation of mobile terminal second embodiment of the present invention；
Fig. 5 is the structural representation of mobile terminal 3rd embodiment of the present invention.
Reference：
1- incoming ends, the first receiving units of 11-, 111- light receiving units, the first data receipt units of 112-, 12- first
Transmitting element, 121- light transmitting elements, the first data transmission units of 122-；
2- mobile terminals, the second transmitting elements of 21-, the second data transmission units of 211-, 212- photomodulators, 213- corner reflections
Device, 214- focus devices, the second receiving units of 22-, the second data receipt units of 221-, 222- photo-detectors, 23- wavelength-division multiplex
Device, 24- collimating lens；
100- downlink optical signals, 200- uplink optical signals.
Specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
As shown in figures 1 and 3, visible light communication system first embodiment of the present invention based on reflection, two-way including carrying out
The mobile terminal 2 of communication and incoming end 1, mobile terminal 2 are usually located in the mobile device of user side, and incoming end 1 is usually located at building
In the position such as lighting source, used as fixed access point, and the lighting source can be LED.
Incoming end 1 includes the first receiving unit 11 and the first transmitting element 12, and the first transmitting element 12 is used for will be to be sent
Data are converted to downlink optical signal and send to mobile terminal 2, and the first receiving unit 11 is used for receiving the up light letter from mobile terminal 2
Numbers 200, and be converted to the corresponding signal of telecommunication.Specifically, the first receiving unit 11 includes that light receiving unit 111 and the first data connect
Unit 112 is received, light receiving unit 111 includes photoelectric switching circuit, for receiving the uplink optical signal 200, carry out photoelectricity and turn
Become the signal of telecommunication after changing；First data receipt unit 112 is used for the signal of telecommunication after demodulating conversion, and the data for demodulating are sent into
Network.First transmitting element 12 includes connected light transmitting element 121 and the first data transmission unit 122, the first data
Transmitting element 122 is connected to network, receives the data for carrying out automatic network, and light transmitting element 121 includes LED and its drive circuit, uses
Send in downlink optical signal 100 is converted the data to.
Mobile terminal 2 includes the second transmitting element 21, the second receiving unit 22, wavelength division multiplexer 23, collimating lens 24, collimation
Lens 24 are used for focusing on and collimating upper and lower traveling optical signal, and wavelength division multiplexer is used for leaching downlink optical signal 100, and the up light of transmission
Signal 200, that is, leach the light of up radio frequency channel wavelength；Second transmitting element 21 is used for modulating data onto into uplink optical signal 200, and
Transmitted to wavelength division multiplexer 23 using the mode of reflection, second receives the single 22 yuan descending light for being used for leaching wavelength division multiplexer 23
Signal 100 carries out opto-electronic conversion, is converted to the signal of telecommunication.Specifically, in the present embodiment, second transmitting element 21 includes second
Data transmission unit 211, photomodulator 212 and corner reflector 213, and photomodulator 212 is reflective light modulators, positioned at angle
The reflecting surface of reflector 213；Second data transmission unit 211 is used for sending data, and reflective light modulators are used for controlling light path
The data modulation of the second data transmission unit 211 is become uplink optical signal 200, corner reflector on up radio frequency channel light by break-make
213 by 200 reflected in parallel of uplink optical signal to wavelength division multiplexer 23.Second receiving unit 22 includes the second data receiver list
Unit 221 and photo-detector 222, photo-detector 222 are used for detecting the downlink optical signal 100 that wavelength division multiplexer 23 is leached, and change
It is electric signal output to the second data receipt unit 221.
In said system, the visible light communication method based on reflection is as follows：
Data to be sent are converted to downlink optical signal 100 and are sent to mobile terminal 2 by down direction, the first transmitting element 12,
By 24 incoming wavelength division multiplexer 23 of collimating lens, wavelength division multiplexer 23 leach the light of not modulated up radio frequency channel wavelength and
Downlink optical signal 100, and send to the second receiving unit 22, the second receiving unit 22 carries out photoelectricity and turns to downlink optical signal 100
Change；
Data waiting for transmission are loaded on the light of up radio frequency channel wavelength by up direction, the second transmitting element 21, are modulated into
Uplink optical signal 200, and the mode using reflection transmitted to wavelength division multiplexer 23, to be sent up of 23 transmission of wavelength division multiplexer
Optical signal 200, and sent by collimating lens 24 to the first receiving unit 11 of incoming end 1, the first receiving unit 11 is to up
After optical signal 200 carries out opto-electronic conversion, by conversion after data send into network.
As shown in Fig. 2 LED-based visible light of the invention is distributed, concrete principle is：Visible light is divided into descending
Radio frequency channel and up radio frequency channel, uplink and downlink data take different radio frequency channels respectively, do not interfere with each other between the two.Send from incoming end
Downlink optical signal 100, only modulates downlink data in descending radio frequency channel, and up radio frequency channel does not add modulation.Wavelength division multiplexer 23 is to descending light
Signal 100 is filtered, and makes the descending radio frequency channel of loading downlink data be separated to photo-detector 222, and not modulated upgoing wave
Road transmission, reflect through corner reflector 213, reflective light modulators modulation after, load upstream data, become uplink optical signal
200, then after being transmitted through wavelength division multiplexer 23 and collimating lens 24, incoming incoming end 1.
Second embodiment：
Visible light communication system in the present embodiment based on reflection is roughly the same with first embodiment, and difference part is to move
The structure setting of moved end 2.As shown in figure 4, the second transmitting element 21 includes the second data transmission unit described in the present embodiment
211st, photomodulator 212 and corner reflector 213, and photomodulator 212 is transmission-type photomodulator, positioned at corner reflector 213
And wavelength division multiplexer 23 between.Second data transmission unit 21 sends data to transmission-type photomodulator, and corner reflector 213 is by ripple
The light of the up radio frequency channel wavelength that division multiplexer 23 is leached is reflected back, and transmission-type photomodulator modulates data on up radio frequency channel ripple
After long light, form uplink optical signal 200 and be sent to wavelength division multiplexer 23；Other modes and first embodiment phase in the present embodiment
With here is omitted.
3rd embodiment：
Visible light communication system in the present embodiment based on reflection is roughly the same with the first two embodiment, and difference part is
The structure setting of mobile terminal 2.As shown in figure 5, second transmitting element 21 includes the second data transmission unit 211, light modulation
Device 212 and focus device 214, and photomodulator 212 is reflective light modulators, and focus device 214 is positioned at reflection type optical tune
Between device processed and wavelength division multiplexer 23, the light of the up radio frequency channel wavelength that wavelength division multiplexer 23 is leached by focus device 214 is focused on
Reflective light modulators, the second data transmission unit 21 send data to reflective light modulators, and reflective light modulators are by number
After light according to modulation to up radio frequency channel wavelength, form 200 line focus device 214 of uplink optical signal and be sent to wavelength division multiplexer 23；
Remaining mode is identical with first embodiment, and here is omitted.
The present invention is not limited to above-mentioned embodiment, for those skilled in the art, without departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (6)
1. a kind of based on the visible light communication system for reflecting, including carrying out mobile terminal and the incoming end of two-way communication, its feature exists
In：
Incoming end includes that the first receiving unit and the first transmitting element, the first transmitting element are used for being converted to down data to be sent
Traveling optical signal is sent to mobile terminal, and the first receiving unit is used for receiving the uplink optical signal from mobile terminal, and is converted to corresponding
The signal of telecommunication；
Mobile terminal includes that the second transmitting element, wavelength division multiplexer, the second receiving unit, collimating lens, collimating lens are used for focusing on
With collimate upper and lower traveling optical signal, wavelength division multiplexer is used for leaching downlink optical signal transmission uplink optical signal, the second transmitting element
For modulating data on the light of up radio frequency channel wavelength, and the mode using reflection is transmitted to wavelength division multiplexer, and second receives
The downlink optical signal that unit is used for leaching wavelength division multiplexer is converted to the signal of telecommunication；
Second transmitting element includes the second data transmission unit, reflective light modulators and focus device, focus device position
Between reflective light modulators and wavelength division multiplexer, focus device is used for the up radio frequency channel wavelength for leaching wavelength division multiplexer
Light focuses on reflective light modulators, and the second data transmission unit is used for sending data to reflective light modulators, reflection type optical
After manipulator modulates data on the light of up radio frequency channel wavelength, form uplink optical signal line focus device and be sent to wavelength-division multiplex
Device.
2. as claimed in claim 1 based on the visible light communication system for reflecting, it is characterised in that：The mobile terminal is located at user side
Mobile device in, incoming end be located at building in lighting source at, as fixed access point.
3. as claimed in claim 1 based on the visible light communication system for reflecting, it is characterised in that：First receiving unit includes
Light receiving unit and the first data receipt unit, light receiving unit are used for receiving the uplink optical signal from mobile terminal, and change
Into the signal of telecommunication；First data receipt unit is used for demodulating the signal of telecommunication, and the data for demodulating are sent into network.
4. as claimed in claim 1 based on the visible light communication system for reflecting, it is characterised in that：First transmitting element includes
Light transmitting element and the first data transmission unit, the first data transmission unit receive the data for carrying out automatic network, light transmitting element bag
LED and its drive circuit is included, is sent for converting the data to downlink optical signal.
5. as claimed in claim 1 based on the visible light communication system for reflecting, it is characterised in that：Second receiving unit includes
Second data receipt unit and photo-detector, photo-detector are used for detecting the downlink optical signal that wavelength division multiplexer is leached, and change
It is electric signal output to the second data receipt unit.
6. a kind of visible light communication method based on system described in claim 1 based on reflection, it is characterised in that：
Data to be sent are converted to downlink optical signal and are sent to mobile terminal by down direction, the first transmitting element, by collimation thoroughly
The incoming wavelength division multiplexer of mirror, wavelength division multiplexer leach the light and downlink optical signal of not modulated up radio frequency channel wavelength, descending
Optical signal is sent to the second receiving unit, and the second receiving unit carries out opto-electronic conversion to downlink optical signal；
The light modulation that data waiting for transmission are loaded into up radio frequency channel wavelength is believed by up direction, the second transmitting element into up light
Number, and transmitted to wavelength division multiplexer, wavelength division multiplexer transmission uplink optical signal to be sent using the mode for reflecting, and pass through standard
Straight lens are sent to the first receiving unit of incoming end, and the first receiving unit is carried out to uplink optical signal after opto-electronic conversion, are sent into
Network.
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| CN201410582633.8A CN104270196B (en) | 2014-10-27 | 2014-10-27 | A kind of visible light communication system and method based on reflection |
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| CN201410582633.8A CN104270196B (en) | 2014-10-27 | 2014-10-27 | A kind of visible light communication system and method based on reflection |
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| CN104270196B true CN104270196B (en) | 2017-03-15 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601236A (en) * | 2015-01-19 | 2015-05-06 | 陈宇廷 | Reflection principle based visible light communication system and method |
| CN104601237A (en) * | 2015-01-19 | 2015-05-06 | 陈宇廷 | Underground positioning system and method based on visible-light two-way communication |
| CN105306855A (en) * | 2015-10-22 | 2016-02-03 | 武汉邮电科学研究院 | Projection system and method based on visible light communication |
| CN110226298B (en) * | 2017-02-03 | 2022-02-18 | 三菱电机株式会社 | Information acquisition system and device |
| CN107425908A (en) * | 2017-05-02 | 2017-12-01 | 中国人民解放军信息工程大学 | A kind of visible light communication devices, systems, and methods |
| DE102017209103A1 (en) * | 2017-05-31 | 2018-12-06 | Osram Gmbh | PROVIDING A WIRELESS COMMUNICATION CONNECTION BETWEEN AT LEAST ONE COMMUNICATION TERMINAL POSITIONED IN A PREFERABABLE ROOM AREA AND A COMMUNICATION NETWORK |
| CN109143212A (en) * | 2018-06-06 | 2019-01-04 | 西安理工大学 | Tunnel personnel location system and method based on the reverse modulation technique of visible light |
| CN109361459A (en) * | 2018-12-10 | 2019-02-19 | 朱新宁 | A kind of optic communication intelligence system and method |
| CN110855361A (en) * | 2019-11-15 | 2020-02-28 | 安徽中骄智能科技有限公司 | LED visible light communication network structure and front terminal system |
| CN111211836B (en) * | 2020-01-09 | 2021-04-20 | 中国人民解放军战略支援部队信息工程大学 | Symmetrical carrier cancellation optical communication method, visible light transceiver and visible light communication terminal |
| CN116418407A (en) * | 2021-12-30 | 2023-07-11 | 华为技术有限公司 | Optical wireless device, communication method, and communication system |
| CN115296744B (en) * | 2022-09-29 | 2023-01-03 | 常州联影智融医疗科技有限公司 | Two-way communication device |
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| KR20140118181A (en) * | 2013-03-28 | 2014-10-08 | 인텔렉추얼디스커버리 주식회사 | Visible light communication system and method for controlling of the system |
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Address after: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee after: Wuhan post and Telecommunications Science Research Institute Co., Ltd. Address before: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee before: Wuhan Inst. of Post & Telecom Science |