CN104639243A - Modulation system for LED (Light-Emitting Diode) visible light communication uplink and building method thereof - Google Patents
Modulation system for LED (Light-Emitting Diode) visible light communication uplink and building method thereof Download PDFInfo
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- CN104639243A CN104639243A CN201510056018.8A CN201510056018A CN104639243A CN 104639243 A CN104639243 A CN 104639243A CN 201510056018 A CN201510056018 A CN 201510056018A CN 104639243 A CN104639243 A CN 104639243A
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Abstract
The invention discloses a modulation system for an LED (Light-Emitting Diode) visible light communication uplink. The modulation system comprises a driving end and a driven end, wherein the driving end consists of a photoelectric detector and an LED light source; light beams emitted from the LED light source are used for inquiring the driven end; the photoelectric detector is used for detecting and receiving reverse reflected light at the driven end; the driven end is fixed in the effective illuminating area of the light LED source; the driven end comprises a moving coil; a reflecting film is attached to the center of the vibrating surface of the moving coil; an oval lens is fixed above the moving coil; an out-of-focus modulation structure is constructed under the light converging actions of the reflecting film and the oval lens; incident light is modulated and reversely emitted back to an effective detection area; a reflected light signal is detected and received through the driving end. According to the modulation system, an MRR (Modulating Retro-reflector) technology is applied to an LED-VLC (Visible Light Communication) system to realize the establishment of an LED-VLC system uplink, so that the LED-VLC uplink does not need any light source, and the size of an LED-VLC uplink emitting terminal is reduced.
Description
Technical field
The invention belongs to visible ray communication technique field, relate to a kind of modulating system of LED visible light communication up link, also relate to a kind of method for building up of LED visible light communication up link.
Background technology
VLC is a kind of technology realizing utilizing the flicker frequency of illumination light to carry out transfer of data, also claims " Li-Fi " (Light Fidelity) technology; LED is a kind of novel energy-conserving light source, be a kind of can be the solid-state semiconductor device of visible ray by electric energy conversion.Along with the proposition of " Li-Fi " concept and the growing of LED illumination technology, LED-VLC system is paid close attention to widely.If the communication base station of indoor and LED illumination device can be combined, and be accessed other communication network, realize a collection illumination and the cordless communication network being in communication in one, communication service economic, at a high speed will be provided for people.VLC has without electromagnetic interference advantage, can be applied to the electromagnetism constrained environment such as aircraft cabin, hospital, and due to the not penetrability of light, makes VLC also have secret, safe advantage.
Two terminals of domestic and international existing LED-VLC system respectively have respective modulation, launch, receive and demodulate module.But because a terminal of LED-VLC system is generally mounted in LED illumination lamp, another is generally directly connected with the mini-plant such as computer, TV, mobile phone, lightness and miniaturization are the necessary demands of system.
In existing relevant report, MRR modulation technique is mainly used in free space optical communication (Free Space Optical Communication, FSO) system, as: 1996, the MRR-FSO that Utah, USA state university Space Dynamics Laboratory and Karen Phillips laboratory are successfully made based on ferroelectric liquid crystals tests, and achieves the half-duplex laser communication link of 20Kbps between 31km aerostat and ground base station.2004, the Shay etc. of University of New Mexico of the U.S. achieved full duplex laser communication link first with the MRR that liquid crystal and corner reflector are formed, and had built the link of traffic rate 10Kbps between ground and satellite.2007, research defence administration of Sweden utilized bandwidth to achieve MRR-FSO system more than the Multiple Quantum Well modulator of 10Mbps and Large visual angle opal optical system, and has carried out the MRR-FSO communication experiment of indoor 90m and outdoor 160m.2008, U.S. NRL, in the test of TridentWarrior sea, utilized bimodulus light emission system and MRR module to establish warship-warship MRR link.Wherein active link length is 4.5km, and bit rate is 2Mbps two-way link, and the MRR angle of visual field is 60 °, only needs rough tracking to set up link.Domestic aspect, 2007, the Zhang Junling of University of Electronic Science and Technology used 650nm lasing light emitter and giant magnetostrictive material and silicon gel as corner reflector, achieves the intensity modulated of echo optical signal 1Kbps.Afterwards, open innovation, carry out the people such as line and just discuss the MRR technology of FSO system and the key technology of existence in theory.
Therefore, how MRR technology is applied to LED-VLC system, makes LED-VLC up link without the need to light source, the foundation for LED-VLC up link provides a kind of new method to become the trend of VLC development.
Summary of the invention
The object of this invention is to provide a kind of LED visible light communication up-line system, use this system successfully to establish up link, make LED-VLC up link without the need to light source, reduce the volume of LED-VLC uplink transmit terminal.
Another object of the present invention is to provide a kind of method for building up of LED visible light communication up link.
The technical solution adopted in the present invention is: the modulating system of LED visible light communication up link, comprise drive end and Partner, drive end is made up of photodetector and LED light source, LED light source transmitted beam is inquired Partner, and photodetector carries out detection to Partner retrodirective reflection light and receives; Partner is fixed in the effective lighting region of LED light source, Partner comprises moving-coil, reflectance coating is posted at the center, vibrations face of moving-coil, ellipsoid lens are fixed with above moving-coil, the convergence effect composition out of focus modulated structure of reflectance coating and ellipsoid lens on light, incident light to be modulated and effective search coverage is returned in reverse transmitting, by drive end, detection is carried out to reflected light signal and receive.
Feature of the present invention is also,
Photodetector is fixed on the side of LED light source.
Reflectance coating is that PET aluminizes reflectance coating.
The diameter of reflectance coating is 1mm.
Ellipsoid lens major diameter 50mm, major axis curvature 100mm, minor axis diameter 25mm, minor axis curvature 20mm.
Another technical scheme of the present invention is: the method for building up of LED visible light communication up link, based on the modulating system of LED visible light communication up link, comprises the following steps:
Step 1: the LED light source lighting drive end, LED light source transmitted beam is inquired Partner;
Step 2: paste reflectance coating to the vibrations center surface of moving-coil;
Step 3: will drive the signal loading of moving-coil on the lead-in wire of moving-coil, then the surface of moving-coil can be shaken along with the change of signal;
Step 4: the beams converge utilizing ellipsoid lens to be sent by LED light source is at reflectance coating center, drive end is got back to by reflecting film reflects, photodetector carries out detection to retrodirective reflection light and receives, and modulation signal will be loaded on the reflective light intensity of unit are, on the photodetector searching surface area of now drive end, light intensity change just can restore modulation signal, realizes information transmission.
Feature of the present invention is also,
The modulating system of described LED visible light communication up link comprises drive end and Partner, drive end is made up of photodetector and LED light source, LED light source transmitted beam is inquired Partner, and photodetector carries out detection to Partner retrodirective reflection light and receives; Partner is fixed in the effective lighting region of LED light source, Partner comprises moving-coil, reflectance coating is posted at the center, vibrations face of moving-coil, ellipsoid lens are fixed with above moving-coil, the convergence effect composition out of focus modulated structure of reflectance coating and ellipsoid lens on light, incident light to be modulated and effective search coverage is returned in reverse transmitting, by drive end, detection is carried out to reflected light signal and receive.
Photodetector is fixed on the side of LED light source.
Reflectance coating is that PET aluminizes reflectance coating, and the diameter of reflectance coating is 1mm.
Ellipsoid lens major diameter 50mm, major axis curvature 100mm, minor axis diameter 25mm, minor axis curvature 20mm.
The invention has the beneficial effects as follows: the modulating system of LED visible light communication up link of the present invention, MRR technology is applied to LED-VLC system, elliposoidal lens and moving-coil is utilized information source to be converted to the strong changes in amplitude of LED light, realize the foundation of LED-VLC system up-link, LED-VLC up link can be made without the need to light source, the modulation rate of this modulator approach has nothing to do with LED power and model, the LED meeting arbitrarily the luminous model of lambert can be modulated, use elliposoidal lens, moving-coil and reflectance coating carry out out of focus modulation to light source incidence light, make echo power along with signal intensity, not only successfully can set up up link, greatly can also reduce the volume of LED-VLC uplink transmit terminal, be conducive to LED-VLC is practical and market-oriented.
Accompanying drawing explanation
Fig. 1 is the modulating system structural representation of LED visible light communication up link of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the modulating system schematic diagram of LED visible light communication up link of the present invention;
Fig. 4 is the modulating system Received signal strength curve chart of LED visible light communication up link of the present invention.
In figure, 1. photodetector, 2.LED light source, 3. effective search coverage, 4. ellipsoid lens, 5. reflectance coating, 6. moving-coil, 7. drive end, 8. Partner.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The modulating system of LED visible light communication up link of the present invention, as shown in Figure 1, comprise drive end 7 and Partner 8, drive end 7 is made up of photodetector 1 and LED light source 2, photodetector 1 is fixed on the side of LED light source 2, LED light source 2 is generally fixed on top, room as room lighting light source, and LED light source 2 transmitted beam is inquired Partner 8, and photodetector 1 pair of Partner 8 retrodirective reflection light carries out detection and receives; Partner 8 is fixed in the effective lighting region of LED light source 2, Partner 8 comprises moving-coil 6, reflectance coating 5 is posted at the center, vibrations face of moving-coil 6, reflectance coating 5 is that the PET of diameter 1mm aluminizes reflectance coating, ellipsoid lens 4 are fixed with above moving-coil 6, ellipsoid lens 4 major diameter 50mm, major axis curvature 100mm, minor axis diameter 25mm, minor axis curvature 20mm, reflectance coating 5 and ellipsoid lens 4 are to the convergence effect composition out of focus modulated structure of light, incident light to be modulated and effective search coverage 3 is returned in reverse transmitting, carry out detection by drive end 7 pairs of reflected light signals and receive.
The method for building up of LED visible light communication up link, based on the modulating system of above-mentioned LED visible light communication up link, comprises the following steps:
Step 1: the LED light source 2 lighting drive end 7, LED light source 2 transmitted beam is inquired Partner 8;
Step 2: shake PET that center surface pastes diameter 1mm to moving-coil 6 and to aluminize reflectance coating 5;
Step 3: will drive the signal loading of moving-coil 6 on the lead-in wire of moving-coil 6, then the surface of moving-coil 6 can be shaken along with the change of signal;
Step 4: utilize light collection that LED light source 2 sends by ellipsoid lens 4 (ellipsoid lens major diameter 50mm, major axis curvature 100mm, minor axis diameter 25mm, minor axis curvature 20mm) at reflectance coating 5 center, the place that namely vibration amplitude is maximum.According to the reverse modulation of optics (MRR) principle, the light that LED light source 2 sends can be reflected back into drive end 7 by reflectance coating 5, and modulation signal will be loaded on the reflective light intensity of unit are.Now, on the photodetector 1 searching surface area of drive end 7, light intensity change just can restore modulation signal, realizes information transmission, and forms the ellipse light spot of a fine strip shape at reflector space, as shown in Figure 2, enough spaces are provided for installing photodetector 1.
In the present invention, the operation principle of MRR modulation technique is as follows: as shown in Figure 3, drive end sends a branch of light beam, focused on by ellipsoid lens at Partner, information source correspondence is converted into the defocusing amount at focus place speculum (or reflectance coating), and beam reflection is returned drive end, now information has just been carried in the light intensity of Returning beam, eventually through the echo power change detecting drive end, realizes information transmission.
Use the inventive method successfully to establish LED visible light communication up link, complete in indoor 2m distance the transfer of data that modulation rate is 100bps, the curve chart of experiment Received signal strength as shown in Figure 4.
The invention has the beneficial effects as follows:
(1) use ellipsoid lens 4 in the present invention, make echo beam form larger oval hot spot, under the prerequisite not affecting modulation effect, providing enough installing spaces for installing photodetector 1, being convenient to install;
(2) curvature due to every bit on ellipsoid lens 4 minute surface is different, and the reflectance coating 5 on moving-coil 6 surface is not strict sphere, therefore can form the ellipse light spot of a fine strip shape at reflector space, provides enough spaces for installing photodetector 1;
(3) the present invention can make the signal launch terminal of LED-VLC system up-link only need install passive modulation module and without the need to light source, greatly reduce equipment volume.
Claims (10)
- The modulating system of 1.LED visible light communication up link, it is characterized in that, comprise drive end (7) and Partner (8), described drive end (7) is made up of photodetector (1) and LED light source (2), LED light source (2) transmitted beam is inquired Partner (8), and photodetector (1) carries out detection to Partner (8) retrodirective reflection light and receives; Described Partner (8) is fixed in the effective lighting region of LED light source (2), Partner (8) comprises moving-coil (6), reflectance coating (5) is posted at the center, vibrations face of described moving-coil (6), described moving-coil (6) top is fixed with ellipsoid lens (4), reflectance coating (5) and ellipsoid lens (4) are to the convergence effect composition out of focus modulated structure of light, incident light to be modulated and effective search coverage (3) is returned in reverse transmitting, by drive end (7), detection is carried out to reflected light signal and receive.
- 2. the modulating system of LED visible light communication up link as claimed in claim 1, it is characterized in that, described photodetector (1) is fixed on the side of LED light source (2).
- 3. the modulating system of LED visible light communication up link as claimed in claim 1, is characterized in that, described reflectance coating (5) to be aluminized reflectance coating for PET.
- 4. the modulating system of the LED visible light communication up link as described in claim 1 or 3, is characterized in that, the diameter of described reflectance coating (5) is 1mm.
- 5. the modulating system of LED visible light communication up link as claimed in claim 1, is characterized in that, described ellipsoid lens (4) major diameter 50mm, major axis curvature 100mm, minor axis diameter 25mm, minor axis curvature 20mm.
- The method for building up of 6.LED visible light communication up link, is characterized in that, based on the modulating system of LED visible light communication up link, comprises the following steps:Step 1: the LED light source (2) lighting drive end (7), LED light source (2) transmitted beam is inquired Partner (8);Step 2: paste reflectance coating (5) to the vibrations center surface of moving-coil (6);Step 3: will drive the signal loading of moving-coil (6) on the lead-in wire of moving-coil (6), then the surface of moving-coil (6) can be shaken along with the change of signal;Step 4: utilize beams converge that LED light source (2) sends by ellipsoid lens (4) at reflectance coating (5) center, drive end (7) is reflected back into by reflectance coating (5), photodetector (1) carries out detection to retrodirective reflection light and receives, and modulation signal will be loaded on the reflective light intensity of unit are, on photodetector (1) the searching surface area of now drive end (7), light intensity change just can restore modulation signal, realizes information transmission.
- 7. the method for building up of LED visible light communication up link as claimed in claim 6, it is characterized in that, the modulating system of described LED visible light communication up link comprises drive end (7) and Partner (8), described drive end (7) is made up of photodetector (1) and LED light source (2), LED light source (2) transmitted beam is inquired Partner (8), and photodetector (1) carries out detection to Partner (8) retrodirective reflection light and receives; Described Partner (8) is fixed in the effective lighting region of LED light source (2), Partner (8) comprises moving-coil (6), reflectance coating (5) is posted at the center, vibrations face of described moving-coil (6), described moving-coil (6) top is fixed with ellipsoid lens (4), reflectance coating (5) and ellipsoid lens (4) are to the convergence effect composition out of focus modulated structure of light, incident light to be modulated and effective search coverage (3) is returned in reverse transmitting, by drive end (7), detection is carried out to reflected light signal and receive.
- 8. the method for building up of LED visible light communication up link as claimed in claim 7, it is characterized in that, described photodetector (1) is fixed on the side of LED light source (2).
- 9. the method for building up of LED visible light communication up link as claimed in claims 6 or 7, is characterized in that, described reflectance coating (5) to be aluminized reflectance coating for PET, and the diameter of reflectance coating (5) is 1mm.
- 10. the method for building up of LED visible light communication up link as claimed in claims 6 or 7, is characterized in that, described ellipsoid lens (4) major diameter 50mm, major axis curvature 100mm, minor axis diameter 25mm, minor axis curvature 20mm.
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| CN105897337A (en) * | 2016-06-27 | 2016-08-24 | 复旦大学 | Micron LED array based visible light communication system and construction method thereof |
| CN106209229A (en) * | 2016-08-26 | 2016-12-07 | 深圳前海霍曼科技有限公司 | Data transmission device based on light and method |
| CN108809421A (en) * | 2018-05-25 | 2018-11-13 | 南京艾凯特光电科技有限公司 | Visible light duplex channel device |
| 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 |
| CN109217924A (en) * | 2018-08-03 | 2019-01-15 | 中国人民解放军陆军工程大学 | For the two-dimensional signal modulation-demodulation device and method of reverse modulation space optical communication |
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| US10666357B2 (en) | 2016-11-23 | 2020-05-26 | Agency For Science, Technology And Research | Light emitting diode communication device, method of forming and operating the same |
| CN113285752A (en) * | 2021-03-24 | 2021-08-20 | 西安理工大学 | Communication method of single RGB-LED miniaturized full-duplex multi-user VLC |
| CN113726879A (en) * | 2021-08-30 | 2021-11-30 | 河南大学 | Hybrid data center network structure VHCN based on VLC link |
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| CN105071854A (en) * | 2015-08-03 | 2015-11-18 | 中国人民解放军理工大学 | Single-light-source full-duplex retro-modulating wireless optical communication device and method |
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| CN113285752A (en) * | 2021-03-24 | 2021-08-20 | 西安理工大学 | Communication method of single RGB-LED miniaturized full-duplex multi-user VLC |
| CN113726879A (en) * | 2021-08-30 | 2021-11-30 | 河南大学 | Hybrid data center network structure VHCN based on VLC link |
| CN113726879B (en) * | 2021-08-30 | 2023-10-24 | 河南大学 | Hybrid data center network system VHCN based on VLC link |
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