CN104270196A - Visible light communication system and method on basis of reflection - Google Patents

Visible light communication system and method on basis of reflection Download PDF

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Publication number
CN104270196A
CN104270196A CN201410582633.8A CN201410582633A CN104270196A CN 104270196 A CN104270196 A CN 104270196A CN 201410582633 A CN201410582633 A CN 201410582633A CN 104270196 A CN104270196 A CN 104270196A
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China
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data
optical signal
division multiplexer
wavelength division
receiving
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CN201410582633.8A
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Chinese (zh)
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CN104270196B (en
Inventor
刘武
杨超
杨奇
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武汉邮电科学研究院
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Publication of CN104270196A publication Critical patent/CN104270196A/en
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Abstract

The invention discloses a visible light communication system and a visible light communication method on the basis of reflection and relates to the field of optical communication of an LED (Light-Emitting Diode). The visible light communication system comprises a mobile end and a switch-in end which are used for carrying out bidirectional communication; the switch-in end comprises a first receiving unit and a first sending unit; the first sending unit is used for converting data to be sent into a downlink optical signal and sending the downlink optical signal to the mobile end; the first receiving unit is used for receiving an uplink optical signal from the mobile end and converting the uplink optical signal into a corresponding electric signal; the mobile end comprises a second sending unit, a wavelength division multiplexer, a second receiving unit and a collimating lens; the collimating lens is used for focusing and collimating the uplink and downlink optical signals; the wavelength division multiplexer is used for filtering out the downlink optical signal and transmitting the uplink optical signal; the second sending unit is used for modulating the data to light with an uplink channel wavelength and transmitting the light to the wavelength division multiplexer in a reflecting manner; the second receiving unit is used for converting the downlink optical signal filtered out by the wavelength division multiplexer into an electric signal.

Description

A kind of visible light communication system based on reflection and method
Technical field
The present invention relates to LED-based optical communication field, specifically relate to a kind of visible light communication system based on reflection and method.
Background technology
LED (Lighting Emitting Diode) is called as forth generation lighting source or green light source, also can be applicable in radio optical communication system while providing room lighting.
Under the condition taking into account illumination and data communication, as information source and light source LED while, data are from the LED of fixed and arranged to user's broadcasting transmitting (down direction).But when user data passes back to LED (on up direction), because transmitting-receiving two-end is difficult to accurate aligning, if mobile terminal upstream data is upwards launched by LED, equipment can produce a large amount of dazzle, and the uplink signal strength that fixed access point receives is low and there is a large amount of crosstalks.Therefore, visible light communication lacks reasonable and practical up channel solution always, limits its reliable two-way communication.
For addressing this problem, the multiple up channel scheme of existing proposition.Such as up employing infrared transmission, although infrared beam has good directivity, but still need to aim at manually or automatically to ensure that receiving terminal aimed at by up infrared beam, the downstream transmission scheme of this mixing is still complicated and cost is high.Another kind of scheme adopts the wireless technology uplink such as wifi, but owing to employing wireless technology, and the communication system of this mixing loses the signal security of visible light communication, advantage that spectral interference is little.Therefore, the transmitted in both directions especially uplink scheme of visible light communication is the difficult point realized at present.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of visible light communication system based on reflection and method, simplify the hardware designs of user terminal, reduce energy resource consumption, reduce costs, save receiving terminal light source and simplify signal transmitting registration mechanism simultaneously.
For reaching above object, the invention provides a kind of visible light communication system based on reflection, comprise the mobile terminal and incoming end of carrying out two-way communication, incoming end comprises the first receiving element and the first transmitting element, first transmitting element is used for that data to be sent are converted to downlink optical signal and is sent to mobile terminal, first receiving element for receiving the uplink optical signal from mobile terminal, and is converted to the corresponding signal of telecommunication; Mobile terminal comprises the second transmitting element, wavelength division multiplexer, the second receiving element, collimating lens, collimating lens is used for focusing on and collimation up-downgoing light signal, wavelength division multiplexer is used for leaching downlink optical signal and transmission uplink optical signal, second transmitting element is for modulating data on the light of up radio frequency channel wavelength, and utilizing the mode of reflection to transfer to wavelength division multiplexer, the downlink optical signal that the second receiving element is used for wavelength division multiplexer to leach is converted to the signal of telecommunication.
On the basis of technique scheme, described mobile terminal is arranged in the mobile device of user side, and incoming end is arranged in the lighting source place of building, as fixed access point.
On the basis of technique scheme, described first receiving element comprises light receiving unit and the first data receipt unit, and light receiving unit for receiving the uplink optical signal from mobile terminal, and converts the signal of telecommunication to; First data receipt unit is used for the demodulation signal of telecommunication, and the data demodulated are sent into network.
On the basis of technique scheme, described first transmitting element comprises light transmitting element and the first data transmission unit, first data transmission unit receives the data of automatic network, and light transmitting element comprises LED and drive circuit thereof, sends for described data are converted to downlink optical signal.
On the basis of technique scheme, described second receiving element comprises the second data receipt unit and photo-detector, and photo-detector is used for the downlink optical signal that leaches of probing wave division multiplexer, and is converted to the signal of telecommunication and exports the second data receipt unit to.
On the basis of technique scheme, described second transmitting element comprises the second data transmission unit, reflective light modulators and corner reflector, and reflective light modulators is positioned at the reflecting surface of corner reflector; Second data transmission unit for sending data, reflective light modulators for by the light of the Data Modulation of the second data transmission unit to up radio frequency channel wavelength, corner reflector by uplink optical signal reflected in parallel to wavelength division multiplexer.
On the basis of technique scheme, described second transmitting element comprises the second data transmission unit, transmission-type optical modulator and corner reflector, transmission-type optical modulator is between corner reflector and wavelength division multiplexer, second data transmission unit is used for sending data to transmission-type optical modulator, the light of the up radio frequency channel wavelength that wavelength division multiplexer leaches by corner reflector reflects back, after transmission-type optical modulator modulates data on the light of up radio frequency channel wavelength, form uplink optical signal and send to wavelength division multiplexer.
On the basis of technique scheme, described second transmitting element comprises the second data transmission unit, reflective light modulators and focus device, focus device is between reflective light modulators and wavelength division multiplexer, the light that focus device is used for the up radio frequency channel wavelength leached by wavelength division multiplexer focuses on reflective light modulators, second data transmission unit is used for sending data to reflective light modulators, after reflective light modulators modulates data on the light of up radio frequency channel wavelength, form uplink optical signal line focus device and send to wavelength division multiplexer.
The present invention also provides a kind of visible light communication method based on reflection, down direction, data to be sent are converted to downlink optical signal and are sent to mobile terminal by the first transmitting element, wavelength division multiplexer is imported into by collimating lens, wavelength division multiplexer leaches light and the downlink optical signal of not modulated up radio frequency channel wavelength, downlink optical signal is sent to the second receiving element, and the second receiving element carries out opto-electronic conversion to downlink optical signal; Up direction, Data import waiting for transmission is become uplink optical signal to the light modulation of up radio frequency channel wavelength by the second transmitting element, and utilize the mode of reflection to transfer to wavelength division multiplexer, the uplink optical signal that wavelength division multiplexer transmission is to be sent, and the first receiving element of incoming end is sent to by collimating lens, after first receiving element carries out opto-electronic conversion to uplink optical signal, send into network.
Beneficial effect of the present invention is: based on visible light communication system and the method for reflection, incoming end is only used to have single light source, mobile terminal does not have light source, mobile terminal is by reflecting reception light and modulating upstream data, and realize simple and reliable uplink communication links between incoming end, simplify the hardware designs of user terminal, achieve the transfer of data of two-way different wave length based on wavelength-division technology; Save receiving terminal light source, reduce energy resource consumption, reduce costs.
Accompanying drawing explanation
Fig. 1 is the block diagram of visible light communication system first embodiment that the present invention is based on 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 of the present invention embodiment;
Fig. 4 is the structural representation of mobile terminal second of the present invention embodiment;
Fig. 5 is the structural representation of mobile terminal of the present invention 3rd embodiment.
Reference numeral:
1-incoming end, 11-first receiving element, 111-light receiving unit, 112-first data receipt unit, 12-first transmitting element, 121-light transmitting element, 122-first data transmission unit;
2-mobile terminal, 21-second transmitting element, 211-second data transmission unit, 212-optical modulator, 213-corner reflector, 214-focus device, 22-second receiving element, 221-second data receipt unit, 222-photo-detector, 23-wavelength division multiplexer, 24-collimating lens;
100-downlink optical signal, 200-uplink optical signal.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in figures 1 and 3, the present invention is based on visible light communication system first embodiment of reflection, comprise the mobile terminal 2 and incoming end 1 of carrying out two-way communication, mobile terminal 2 is usually located in the mobile device of user side, incoming end 1 is usually located at the positions such as the lighting source in building, as fixed access point, and this lighting source can be LED.
Incoming end 1 comprises the first receiving element 11 and the first transmitting element 12, first transmitting element 12 is sent to mobile terminal 2 for data to be sent are converted to downlink optical signal, first receiving element 11 for receiving the uplink optical signal 200 from mobile terminal 2, and is converted to the corresponding signal of telecommunication.Concrete, the first receiving element 11 comprises light receiving unit 111 and the first data receipt unit 112, and light receiving unit 111 comprises photoelectric switching circuit, for receiving described uplink optical signal 200, becomes the signal of telecommunication after carrying out opto-electronic conversion; The data demodulated for the signal of telecommunication after demodulation conversion, and are sent into network by the first data receipt unit 112.Described first transmitting element 12 comprises connected light transmitting element 121 and the first data transmission unit 122, first data transmission unit 122 is connected to network, receive the data of automatic network, light transmitting element 121 comprises LED and drive circuit thereof, sends for described data are converted to downlink optical signal 100.
Mobile terminal 2 comprises the second transmitting element 21, second receiving element 22, wavelength division multiplexer 23, collimating lens 24, collimating lens 24 is for focusing on and collimation up-downgoing light signal, wavelength division multiplexer is used for leaching downlink optical signal 100, and transmission uplink optical signal 200, namely leach the light of up radio frequency channel wavelength; Second transmitting element 21 for Data Modulation is become uplink optical signal 200, and utilizes the mode of reflection to transfer to wavelength division multiplexer 23, and second receives single 22 yuan carries out opto-electronic conversion for the downlink optical signal 100 leached by wavelength division multiplexer 23, is converted to the signal of telecommunication.Concrete, in the present embodiment, described second transmitting element 21 comprises the second data transmission unit 211, optical modulator 212 and corner reflector 213, and optical modulator 212 is reflective light modulators, is positioned at the reflecting surface of corner reflector 213; Second data transmission unit 211 is for sending data, reflective light modulators is for controlling light path break-make, the Data Modulation of the second data transmission unit 211 is become uplink optical signal 200 to up radio frequency channel light, corner reflector 213 by uplink optical signal 200 reflected in parallel to wavelength division multiplexer 23.Described second receiving element 22 comprises the second data receipt unit 221 and photo-detector 222, the downlink optical signal 100 that photo-detector 222 leaches for probing wave division multiplexer 23, and is converted to the signal of telecommunication and exports the second data receipt unit 221 to.
In said system, the visible light communication method based on reflection is as follows:
Down direction, data to be sent are converted to downlink optical signal 100 and are sent to mobile terminal 2 by the first transmitting element 12, wavelength division multiplexer 23 is imported into by collimating lens 24, wavelength division multiplexer 23 leaches light and the downlink optical signal 100 of not modulated up radio frequency channel wavelength, and be sent to the second receiving element 22, second receiving element 22 pairs of downlink optical signals 100 and carry out opto-electronic conversion;
Up direction, second transmitting element 21 by Data import waiting for transmission on the light of up radio frequency channel wavelength, be modulated into uplink optical signal 200, and utilize the mode of reflection to transfer to wavelength division multiplexer 23, the uplink optical signal 200 that wavelength division multiplexer 23 transmission is to be sent, and after carrying out opto-electronic conversion by the first receiving element 11, first receiving element 11 pairs of uplink optical signals 200 that collimating lens 24 is sent to incoming end 1, the data after conversion are sent into network.
As shown in Figure 2, the present invention is based on the visible light distribution of LED, concrete principle is: visible light is divided into descending radio frequency channel and up radio frequency channel, and uplink and downlink data take different radio frequency channels respectively, do not interfere with each other between the two.From the downlink optical signal 100 that incoming end sends, only at descending radio frequency channel modulation downlink data, up radio frequency channel does not add modulation.Wavelength division multiplexer 23 pairs of downlink optical signals 100 carry out filtering, the descending radio frequency channel of loading downlink data is made to be separated to photo-detector 222, and not modulated up radio frequency channel 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, import incoming end 1 into.
Second embodiment:
Visible light communication system based on reflection in the present embodiment is roughly the same with the first embodiment, and difference part is the vibrational power flow of mobile terminal 2.As shown in Figure 4, described in the present embodiment, the second transmitting element 21 comprises the second data transmission unit 211, optical modulator 212 and corner reflector 213, and optical modulator 212 is transmission-type optical modulator, between corner reflector 213 and wavelength division multiplexer 23.Second data transmission unit 21 sends data to transmission-type optical modulator, the light of the up radio frequency channel wavelength that wavelength division multiplexer 23 leaches by corner reflector 213 reflects back, after transmission-type optical modulator modulates data on the light of up radio frequency channel wavelength, form uplink optical signal 200 and send to wavelength division multiplexer 23; In the present embodiment, other modes are identical with the first embodiment, repeat no more herein.
3rd embodiment:
Visible light communication system based on reflection in the present embodiment is roughly the same with the first two embodiment, and difference part is the vibrational power flow of mobile terminal 2.As shown in Figure 5, described second transmitting element 21 comprises the second data transmission unit 211, optical modulator 212 and focus device 214, and optical modulator 212 is reflective light modulators, focus device 214 is between reflective light modulators and wavelength division multiplexer 23, the light of the up radio frequency channel wavelength that wavelength division multiplexer 23 leaches by focus device 214 focuses on reflective light modulators, second data transmission unit 21 sends data to reflective light modulators, after reflective light modulators modulates data on the light of up radio frequency channel wavelength, form uplink optical signal 200 line focus device 214 and send to wavelength division multiplexer 23, all the other modes are identical with the first embodiment, repeat no more herein.
The present invention is not limited to above-mentioned execution mode, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.

Claims (9)

1., based on a visible light communication system for reflection, comprise the mobile terminal and incoming end of carrying out two-way communication, it is characterized in that:
Incoming end comprises the first receiving element and the first transmitting element, and the first transmitting element is used for that data to be sent are converted to downlink optical signal and is sent to mobile terminal, and the first receiving element for receiving the uplink optical signal from mobile terminal, and is converted to the corresponding signal of telecommunication;
Mobile terminal comprises the second transmitting element, wavelength division multiplexer, the second receiving element, collimating lens, collimating lens is used for focusing on and collimation up-downgoing light signal, wavelength division multiplexer is used for leaching downlink optical signal and transmission uplink optical signal, second transmitting element is for modulating data on the light of up radio frequency channel wavelength, and utilizing the mode of reflection to transfer to wavelength division multiplexer, the downlink optical signal that the second receiving element is used for wavelength division multiplexer to leach is converted to the signal of telecommunication.
2., as claimed in claim 1 based on the visible light communication system of reflection, it is characterized in that: described mobile terminal is arranged in the mobile device of user side, incoming end is arranged in the lighting source place of building, as fixed access point.
3. as claimed in claim 1 based on the visible light communication system of reflection, it is characterized in that: described first receiving element comprises light receiving unit and the first data receipt unit, light receiving unit for receiving the uplink optical signal from mobile terminal, and converts the signal of telecommunication to; First data receipt unit is used for the demodulation signal of telecommunication, and the data demodulated are sent into network.
4. as claimed in claim 1 based on the visible light communication system of reflection, it is characterized in that: described first transmitting element comprises light transmitting element and the first data transmission unit, first data transmission unit receives the data of automatic network, light transmitting element comprises LED and drive circuit thereof, sends for described data are converted to downlink optical signal.
5. as claimed in claim 1 based on the visible light communication system of reflection, it is characterized in that: described second receiving element comprises the second data receipt unit and photo-detector, photo-detector is used for the downlink optical signal that leaches of probing wave division multiplexer, and is converted to the signal of telecommunication and exports the second data receipt unit to.
6., as claimed in claim 1 based on the visible light communication system of reflection, it is characterized in that: described second transmitting element comprises the second data transmission unit, reflective light modulators and corner reflector, and reflective light modulators is positioned at the reflecting surface of corner reflector; Second data transmission unit for sending data, reflective light modulators for by the light of the Data Modulation of the second data transmission unit to up radio frequency channel wavelength, corner reflector by uplink optical signal reflected in parallel to wavelength division multiplexer.
7. as claimed in claim 1 based on the visible light communication system of reflection, it is characterized in that: described second transmitting element comprises the second data transmission unit, transmission-type optical modulator and corner reflector, transmission-type optical modulator is between corner reflector and wavelength division multiplexer, second data transmission unit is used for sending data to transmission-type optical modulator, the light of the up radio frequency channel wavelength that wavelength division multiplexer leaches by corner reflector reflects back, after transmission-type optical modulator modulates data on the light of up radio frequency channel wavelength, form uplink optical signal and send to wavelength division multiplexer.
8. as claimed in claim 1 based on the visible light communication system of reflection, it is characterized in that: described second transmitting element comprises the second data transmission unit, reflective light modulators and focus device, focus device is between reflective light modulators and wavelength division multiplexer, the light that focus device is used for the up radio frequency channel wavelength leached by wavelength division multiplexer focuses on reflective light modulators, second data transmission unit is used for sending data to reflective light modulators, after reflective light modulators modulates data on the light of up radio frequency channel wavelength, form uplink optical signal line focus device and send to wavelength division multiplexer.
9., based on the visible light communication method based on reflection of system described in claim 1, it is characterized in that:
Down direction, data to be sent are converted to downlink optical signal and are sent to mobile terminal by the first transmitting element, wavelength division multiplexer is imported into by collimating lens, wavelength division multiplexer leaches light and the downlink optical signal of not modulated up radio frequency channel wavelength, downlink optical signal is sent to the second receiving element, and the second receiving element carries out opto-electronic conversion to downlink optical signal;
Up direction, Data import waiting for transmission is become uplink optical signal to the light modulation of up radio frequency channel wavelength by the second transmitting element, and utilize the mode of reflection to transfer to wavelength division multiplexer, the uplink optical signal that wavelength division multiplexer transmission is to be sent, and the first receiving element of incoming end is sent to by collimating lens, after first receiving element carries out opto-electronic conversion to uplink optical signal, send into network.
CN201410582633.8A 2014-10-27 2014-10-27 A kind of visible light communication system and method based on reflection CN104270196B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
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
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
CN109361459A (en) * 2018-12-10 2019-02-19 朱新宁 A kind of optic communication intelligence system and method
CN110710333A (en) * 2017-05-31 2020-01-17 欧司朗有限责任公司 Providing a wireless communication connection between at least one communication terminal positioned in a predefinable spatial area and a communication network
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
CN111211836A (en) * 2020-01-09 2020-05-29 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

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JP4653828B2 (en) * 2008-09-12 2011-03-16 株式会社東芝 Visible light communication system and visible light communication apparatus
CN102957479A (en) * 2011-08-31 2013-03-06 深圳光启高等理工研究院 LED visible light communication system and light receiving antenna
KR20140118181A (en) * 2013-03-28 2014-10-08 인텔렉추얼디스커버리 주식회사 Visible light communication system and method for controlling of the system

Cited By (8)

* Cited by examiner, † Cited by third party
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
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
CN110710333A (en) * 2017-05-31 2020-01-17 欧司朗有限责任公司 Providing a wireless communication connection between at least one communication terminal positioned in a predefinable spatial area and a communication network
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
CN111211836A (en) * 2020-01-09 2020-05-29 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

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