CN110071770A - Visible light communication receiver - Google Patents
Visible light communication receiver Download PDFInfo
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- CN110071770A CN110071770A CN201910406965.3A CN201910406965A CN110071770A CN 110071770 A CN110071770 A CN 110071770A CN 201910406965 A CN201910406965 A CN 201910406965A CN 110071770 A CN110071770 A CN 110071770A
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- Prior art keywords
- visible light
- light communication
- lens
- communication receiver
- photodetector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Light Receiving Elements (AREA)
Abstract
The invention discloses a kind of visible light communication receivers, the visible light communication receiver is connect with extraneous visible light communication transmitter, the visible light communication transmitter includes transmitter circuit, the modulated light source being connect with the transmitter circuit, the visible light communication receiver includes acceptor circuit, the photodetector being connect with the acceptor circuit, and Fresnel Lenses, the acceptor circuit is connect with the photodetector, wherein, the Fresnel Lenses is convex, the Fresnel Lenses is used for the optical diffraction that generates the modulated light source to the photodetector, so that the photodetector receives optical signal under multiple focuses or at the different location of detector.Compared with the existing technology, present invention improves visible light communication efficiency, it is seen that the visual field of optical receiver coverage area.
Description
Technical field
The present invention relates to field of photoelectric devices more particularly to a kind of visible light communication receivers.
Background technique
As shown in Figure 1, current visible light communication system generally includes transmitter and acceptor circuit and light-emitting diodes
Pipe and photodetector, to send and receive data by optical link.When optical link becomes unavailable, Wi-Fi can choose
Link conduct is spare, and continuation sends and receives data.
Fig. 2 shows with the photodiode of acceptor circuit being connected in existing visible light communication system and one thoroughly
Mirror pairing, lens can increase luminous intensity to be received by photodiode.This increased luminous intensity will be converted into increase
By photodiode and the received power density of acceptor circuit, therefore further increase the signal-to-noise ratio (SNR) for receiving signal.This
It is the convergent beam for being converted into angle pencil of ray that there is minimum focus radius due to lens.
In current visible light communication system, transmitter and receiver usually require sight connect (LOS) in order to provide
High data transmission efficiency.
However, in a practical situation, sight connection is not always to always exist, because the visual field (FOV) of receiver may
If the position that can change it is moved.
If the reception signal orientation of receiver changes, may cause between the visual field of transmitter and receiver
Alignment line can not achieve.
Summary of the invention
It is a primary object of the present invention to propose a kind of visible light communication receiver, it is intended to improve visible light communication efficiency,
The reception power of visible light communication device is improved in the visual field of receiver coverage area.
To achieve the above object, the present invention provides a kind of visible light communication receiver, the visible light communication receiver with
Extraneous visible light communication transmitter connection, the visible light communication transmitter include transmitter circuit and the transmitter circuit
The modulated light source of connection, the visible light communication receiver includes acceptor circuit, the photoelectricity that connect with the acceptor circuit
Detector and Fresnel Lenses, the acceptor circuit are connect with the photodetector, wherein the Fresnel Lenses
For convex, the optical diffraction that the Fresnel Lenses is used to generate the modulated light source is to the photodetector, so that institute
It states photodetector and receives optical signal under multiple focuses or at the different location of detector.
Wherein, the light plane of incidence and photodetector that the photodetector is positioned at the modulated light source generation are most
High point.
Wherein, the modulated light source is light emitting diode or laser diode or laser or optical modulator
One of.
Wherein, the photodetector is photodiode, array photoelectric diode, array charge-coupled device, array
One of CMOS, avalanche photodide or APD detector array.
Wherein, the visible light communication receiver further includes the first microcontroller connecting with the acceptor circuit, institute
Stating visible light communication transmitter further includes the second microcontroller connecting with the transmitter circuit, first microcontroller with
Pass through WIFI connection between second microcontroller.
Wherein, the visible light communication receiver further includes the first modulator connecting with first microcontroller, institute
Stating visible light communication receiver further includes the second modulator connecting with second microcontroller.
The beneficial effects of the present invention are: visible light communication receiver of the present invention is through the above technical solutions, using convex phenanthrene
Nie Er lens improve visible light communication efficiency, and improve the visual field of visible light receiver coverage area.Convex Fresnel is saturating
Mirror can be by being placed in the reception power that multiple focuses get off to improve visible light communication receiver for photodiode.Use convex
Fresnel lens further improves the transmission range between light emitting diode and photodiode.Convex Fresnel lens can also be double
To using, multiple focuses are manufactured in visible light communication receiver in the two sides of convex Fresnel lens.
Detailed description of the invention
Fig. 1 is the visible light communication transmitter of not Fresnel Lenses in the prior art and visible light communication receiver is
The block diagram for structure of uniting；
Fig. 2 is in the visible light communication system of the prior art, and convex lens and photodiode pairing are connected to receiver electricity
The schematic diagram on road；
Fig. 3 is that the present invention has the visible light communication transmitter of Fresnel Lenses and the system knot of visible light communication receiver
The block diagram of structure；
Fig. 4 is the block diagram of visible light communication receiver circuit, which has improved luxuriant and rich with fragrance alunite
Ear lens and photodiode, the photodiode are connected to microcontroller and demodulator.
Fig. 5 is the top view of convex Fresnel Lenses；
Fig. 6 is the bottom view of convex Fresnel Lenses；
Fig. 7 is the front view of convex Fresnel Lenses；
The focus schematic diagram of Fig. 8 existing minimum number when being using straight Fresnel Lenses；
The schematic diagram of Fig. 9 existing multiple focuses when being using convex Fresnel Lenses；
Figure 10 shows the Fresnel lens of a forming, it shows that incident optical signal is diffracted into multiple focuses；
Figure 11 (a) and 11 (b) figures illustrate various lens used in experiment to determine most effective Fresnel lens；
Figure 12 is showing for the experimental provision of the visible light communication system efficiency at the direct sight for determining different distance
It is intended to.
Figure 13 is the visible light communication system for determining different transmission of angle between light emitting diode and photodiode
The schematic diagram of the experimental provision of efficiency.
Figure 14 is the visible light communication system for determining different photodiode positions (not in the connection of direct sight)
The schematic diagram of the experimental provision of efficiency.
Figure 15 is the experiment dress for determining the visible light communication system efficiency in the overlay area of light emitting diode transmission
The schematic diagram set.
Figure 16 is for determining that the visible light communication efficiency of the light emitting diode overlay area in taper radius R works as photoelectricity two
The schematic diagram of the experimental provision for the situation that pole pipe is moved.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Please refer to Fig. 1 to Figure 16, the present invention proposes a kind of visible light communication receiver, the visible light communication receiver with
Extraneous visible light communication transmitter connection, the visible light communication transmitter include transmitter circuit and the transmitter circuit
The modulated light source of connection, the visible light communication receiver includes acceptor circuit, the photoelectricity that connect with the acceptor circuit
Detector and Fresnel Lenses, the acceptor circuit are connect with the photodetector, wherein the Fresnel Lenses
For convex.
It is understood that the optical diffraction that convex Fresnel Lenses can generate the modulated light source is visited to the photoelectricity
Device is surveyed, so that the photodetector receives optical signal under multiple focuses or at the different location of detector.
As an implementation, the photodetector is positioned at the light incidence that the modulated light source generates by the present invention
The highest point of plane and photodetector, thus, it is possible to improve the visual field of the visible light communication receiver detection.
Wherein, in one embodiment, used modulated light source can use the light emitting diode of standard, and photoelectricity
Detector then can be using highly sensitive silicon type photodiode.The modulated light source can also using laser diode or
Person's laser or optical modulator (SLM) or any modulated light source with backlight.In addition, photodetector can also use
Photodiode, array photoelectric diode, array charge-coupled device (CCD), array CMOS, avalanche photodide (APD)
Or one of APD detector array, to detect high bandwidth optical signal.Light-emitting diodes are mainly used with modulated light source below
Pipe, photodetector elaborate to the present invention for using photodiode.
It is understood that the Fresnel Lenses of convex shape can provide multiple self-luminous in focus future in the present invention
The optical diffraction of diode is to photodiode.Thus, it is possible to photodiode be placed on to different positions, because of multiple focuses
Increase the light transmission angle in visible light communication receiver and the transmission range between light emitting diode and photodiode.
Compared with prior art, transmission range is elongated between light emitting diode and photodiode improves photodiode
Receive the efficiency of power.Relative transport angle between light emitting diode and photodiode is wider, also improves two pole of photoelectricity
The efficiency of pipe reception power.It should be noted that the Fresnel Lenses two-way can also use, in visible light in the present invention
Multiple focuses are provided in communication sink.
As an implementation, when manufacturing Fresnel Lenses, the container using particular size is needed, it is saturating by heating
The manufacturing processes of lens is completed in the combination of mirror or other mechanical devices or both.
Specifically, lens to be prepared are put into the container (such as bowl) equipped with preheating cooking oil, in 80 DEG C of -90 DEG C of temperature models
Interior heating 3-5min is enclosed, the lens to be prepared after heating are put into the container of preset diameters, applies pressure, in 10-12 seconds
Lens to be prepared are molded as preset shape, then the lens to be prepared for being molded as preset shape are cooled down at room temperature, obtain institute
State Fresnel Lenses.Wherein, the lens to be prepared after heating are put into the container of preset diameters, it can be with easy to produce different big
Small lens, and lens to be prepared are molded as preset shape in 10-12 seconds, it can be ensured that Fresnel Lenses keeps soft.
In other embodiments, the formation and improvement of Fresnel lens can also pass through other heating means, deposition side
Method or the forming of other mechanical means, or the two combination as needed.
Further, in the present invention, the visible light communication receiver further includes the connect with the acceptor circuit
One microcontroller, the visible light communication transmitter further includes the second microcontroller connecting with the transmitter circuit, described
Pass through WIFI connection between first microcontroller and second microcontroller.
Further, the visible light communication receiver further includes the first modulation connecting with first microcontroller
Device, the visible light communication receiver further include the second modulator connecting with second microcontroller.
Structure, the working principle of visible light communication receiver of the present invention are further elaborated below.
As shown in figure 3, the present invention proposes that a kind of visible light communication (VLC) being used together with visible light communication transmitter connects
Receive device.The visible light communication system for (using Fresnel lens) shown in (do not use lens) and Fig. 3 as shown in Figure 1 include one group and
The transceiver circuit of microcontroller (MCU) interface.Transmitter circuit is connect with modulated light source, acceptor circuit and photodetector
Connection.In this example, as shown in figure 3, Light-emitting diode LED is used as modulated light source, and photodiode is used as
For electric explorer.Input optical signal from Light-emitting diode LED is sensed by photodiode, and its optical signal is converted to electricity
Then signal handles the data sent by acceptor circuit.Two WiFi transceivers are on the circuit of transmitter and receiver
Communication link between two circuits of control is provided.
Fig. 4 further shows visible light communication receiver and includes photodiode and bend to the Fresnel that convex is modified
Lens, so that the light from Light-emitting diode LED allows optical signal more by generating multiple focuses when Fresnel Lenses diffraction
A focus is received by photodiode.
In other words, photodiode can be positioned at multiple focal points to receive incident optical signal.Which improve visible
The visual field (FOV) of the detection of optical communication receiver.However, it is noted that photodiode is generally positioned at so that light
Electric diode can receive highest reception power that be exactly incident optical signal it is opposite with photodiode plane of incidence at most
High point, that by be photodiode optimum position.Used Light-emitting diode LED is the business LED of standard, silicon point touching type
(PIN) photodiode is used since it is highly sensitive.Used light source can be further selected from laser diode, laser
Device, the spatial light modulator (SLM) with backlight or any modulated light source.In terms of used photodetector, Ke Yicong
Photodiode, photodiode array, charge-coupled device (CCD) array, CMOS of the detection high bandwidth optical signal of permission
It is selected in array, avalanche photodide (APD) and APD detector array etc..
In order to improve the performance of above-mentioned visible light communication system, improve visible light communication receiver using Fresnel lens
Visual field.Fig. 5 shows that the top view of improved Fresnel lens, Fig. 6 show the bottom view of improved Fresnel lens.Figure
7 show modification after diameter reduce Fresnel lens front view.
Fig. 8 and Fig. 9 shows the difference of influence of the Fresnel lens to the optical signal passed through.Fig. 8 is shown known to one
Fresnel lens, for by optical signal, to generate the focus of minimum number.When straight Fresnel Lenses receives incident light letter
Number when, the parallel incident light of lens convergent beams is known as prime focus in a point.Fig. 9 is shown to be modified by curved lens
Fresnel lens.Reduce the diameters of lens due to carrying out shaping to Fresnel lens, incident collimated light beam will with
Machine mode is assembled because crosslights (as shown in Figure 10) is to generate multiple focuses in different positions.This and Fresnel lens
Known usage it is different, the focus that Fresnel lens generates is less.This optical Fourier effect can be improved signal quality, lead to
It crosses various wavefront radiation and generates multiple optical focus through Fresnel lens.Being using the advantages of improvement lens can be a photoelectricity two
Pole pipe is placed on different positions so as to the light transmission angle in increase system, and increases Light-emitting diode LED and two pole of photoelectricity
Different distance between pipe.See in this experiment that will can be carried out below.
As shown in table 1 below, table 1 shows that 7 kinds of different types of Fresnel Lenses, these lens are real in following experiment
With, as Figure 11 (a) lens modification before and Figure 11 (b) lens modification after shown in.
Figure 12 shows the experimental provision of optics visible light communication receiver, wherein photodiode is directly placed at hair
In the sight of optical diode LED (0 ° of angle between Light-emitting diode LED and photodiode).Improved Fresnel lens is put
It sets in the same sight before photodiode.Photodiode is connected further to acceptor circuit.Transmitter circuit and
Acceptor circuit is connected further to computer to generate signal and processing and receive signal.By adjusting Light-emitting diode LED and light
The distance between electric diode is tested between 30 centimetres to 285 centimetres.
In order to determine lens performance, this experiment is sent to by different size of file or data from Light-emitting diode LED
Acceptor circuit.
Table 1
As shown in table 2, table 2 shows experimental result, wherein lens B and lens C be modified also and meanwhile obtain efficiency
Highest Fresnel Lenses.Chart 2 shows overall lens effect when 0 ° of angle between LED (101) and photodiode (105)
Rate (30 centimetres to 285 centimetres of distance ranges)
Figure 13 shows the similar experimental provision of optics visible light communication receiver, and wherein photodiode is directly placed
Within the sight of Light-emitting diode LED.
In this setting, angle between Light-emitting diode LED and photodiode with 10 degree of increasing amount adjustments by angle from
10 are gradually tuned as 100.Used non-automatic/method for moving manually adjust Light-emitting diode LED and photodiode it
Between angle thus reach required angle.In order to determine lens performance, experiment will be by different size of file or data from hair
Optical diode LED is sent to acceptor circuit.
| Lens (lens) | VLC Efficiency (visible light communication system efficiency) |
| Without lens | 13.70% |
| Lens A | 62.47% |
| Lens B | 94.08% |
| Lens C | 98.96% |
| Lens D | 53.83% |
| Lens E | 50.00% |
| Lens F | 50.00% |
| Lens G | 48.799% |
Table 2
As shown in table 3, table 3 is shown in the lens efficiency under fixing 75 cm distances and under conditions of the different angle of departure
Or total visible light communication system efficiency
Table 3 shows experimental result, and wherein lens B and C is the improvement Fresnel lens with peak efficiency.
Figure 14 shows the similar experimental provision of optics visible light communication receiver, wherein photodiode be placed on from
The specified distance of Light-emitting diode LED sight is opened, so that the angle between Light-emitting diode LED and photodiode is with 10 degree
Angle is gradually tuned as 100 ° from 10 by increasing amount adjustment.The example of the specific distance used is 40.5 centimetres.Experiment is luminous two
It is carried out under 30 centimetres of fixed range between pole pipe LED and photodiode.
In order to determine lens performance, experiment will be sent to by different size of file or data from Light-emitting diode LED
Acceptor circuit.
| Lens (lens) | Total VLC Efficiency (total visible light communication system efficiency) |
| Without lens | 0.00% |
| Lens A | 82.19% |
| Lens B | 92.86% |
| Lens C | 89.46% |
| Lens D | 86.60% |
| Lens E | 80.00% |
| Lens F | 85.89% |
| Lens G | 70.26% |
Table 3
As shown in table 4, lens efficiency between Light-emitting diode LED and photodiode under 30 centimetres of fixed range into
Row, Light-emitting diode LED overlay area moving photoconductor diode location.
Table 4 shows that almost all of lens all show efficient experimental result.
Figure 15 shows the experimental provision of optics visible light communication receiver, to determine the covering of Light-emitting diode LED
The detection visual field (FOV) of area and visible light communication system receiver.Experiment be Light-emitting diode LED and photodiode it
Between carried out using three of 30 centimetres, 150 centimetres and 225 centimetres different fixed ranges.As shown in figure 16, photodiode and
Fresnel Lenses is mobile in the Light-emitting diode LED taper overlay area radius R.
In order to determine lens performance, experiment will be sent to by different size of file or data from Light-emitting diode LED
Different photodiode positions.
| Lens (lens) | Total VLC Efficiency (total visible light communication system efficiency) |
| Without lens | 61.09% |
| Lens A | 100.00% |
| Lens B | 100.00% |
| Lens C | 100.00% |
| Lens D | 100.00% |
| Lens E | 100.00% |
| Lens F | 100.00% |
| Lens G | 98.51% |
Table 4
Table 5 shows the experimental result using lens B and lens C.Lens B and C is in Light-emitting diode LED and two pole of photoelectricity
Optimal largest beam angle is shown in contrast with when not using lens when pipe distance is 150 centimetres, while being possessed with more
Big radius is 121 centimetres or 130 centimetres.
Therefore, modified Fresnel lens is providing compared with other lenses or in contrast improvement without using lens
Visual field.
Table 5
As shown in table 6, table 6 shows lens B and lens C shows highest efficiency in visible light communication receiver.
| Lens | Overall VLC Efficiency% (total visible light communication system efficiency) | |
| 1 | B | 94.341% |
| 2 | C | 89.530% |
| 3 | A | 81.280% |
| 4 | F | 77.782% |
| 5 | D | 72.609% |
| 6 | E | 70.059% |
| 7 | G | 61.843% |
| 8 | Without lens | 33.292% |
As shown in table 7 and table 8, the performance that table 7 provides lens B in visible light communication receiver is summarized, and Fig. 8 is provided can
The performance of lens C is summarized in light-exposed communication sink.
Table 7
Table 8
As shown in table 9, table 9 presents feature shown in the improved Fresnel Lenses of experimental result.
Table 9
It is understood that Fresnel Lenses employed in the present invention can be also suitably used for mixed type visible light communication system
System, Li-Fi is used for transmission down link data within the system, and WiFi is used for transmission uplink data.
Li-Fi is used for transmission downlink transmission under normal circumstances, and when the link is blocked or hinders, that is mixed
Collaboration, which is united, will automatically switch to the use of WiFi.
The data that microcontroller processing LiFi sends or receives are handled, modulation and demodulation.Mixed type visible light communication
System provides safety more better than pure WiFi system, because mixed type visible light communication system is not easy to recognize personal data quilt
Access.Mixed type visible light communication system additionally provides bandwidth ability more broader than existing WiFi system and to electromagnetic interference
(EMI) higher immunity.Application of the Fresnel lens in mixed type visible light communication system may make system balance not have
There is the case where sight connection.
The invention has the advantages that visible light communication receiver of the present invention is through the above technical solutions, using convex phenanthrene
Nie Er lens improve visible light communication efficiency, and improve the visual field of visible light receiver coverage area.Convex Fresnel is saturating
Mirror can be by being placed in the reception power that multiple focuses get off to improve visible light communication receiver for photodiode.Use convex
Fresnel lens further improves the transmission range between Light-emitting diode LED and photodiode.Convex Fresnel lens can also
With two-way use, multiple focuses are manufactured in visible light communication receiver in the two sides of convex Fresnel lens.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (6)
1. a kind of visible light communication receiver, which is characterized in that the visible light communication receiver and extraneous visible light communication are sent out
Emitter connection, the visible light communication transmitter includes transmitter circuit, the modulated light source that connect with the transmitter circuit, institute
Stating visible light communication receiver includes acceptor circuit, the photodetector and Fresnel that connect with the acceptor circuit
Lens, the acceptor circuit are connect with the photodetector, wherein the Fresnel Lenses is convex, the Fresnel
The optical diffraction that lens are used to generate the modulated light source is to the photodetector, so that the photodetector is multiple
Optical signal is received under focus or at the different location of detector.
2. visible light communication receiver according to claim 1, which is characterized in that the photodetector is positioned at described
The highest point of light plane of incidence and photodetector that modulated light source generates.
3. visible light communication receiver according to claim 2, which is characterized in that the modulated light source is light-emitting diodes
Pipe or laser diode or one of laser or optical modulator.
4. visible light communication receiver according to claim 2, which is characterized in that the photodetector is two pole of photoelectricity
In pipe, array photoelectric diode, array charge-coupled device, array CMOS, avalanche photodide or APD detector array
One kind.
5. visible light communication receiver according to claim 1, which is characterized in that the visible light communication receiver also wraps
The first microcontroller connecting with the acceptor circuit is included, the visible light communication transmitter further includes and the transmitter electricity
Second microcontroller of road connection, passes through WIFI connection between first microcontroller and second microcontroller.
6. visible light communication receiver according to claim 5, which is characterized in that the visible light communication receiver also wraps
The first modulator connecting with first microcontroller is included, the visible light communication receiver further includes and second micro-control
Second modulator of device connection processed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110557201A (en) * | 2019-08-09 | 2019-12-10 | 华南理工大学 | Multi-angle receiving device of underwater visible light communication mobile node |
| WO2021040626A1 (en) * | 2019-08-30 | 2021-03-04 | Agency For Science, Technology And Research | Li-fi communication device |
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| CN203984609U (en) * | 2014-03-06 | 2014-12-03 | 鄢其力 | Based on the wireless sound box of LED visible light communication |
| US20170346559A1 (en) * | 2016-05-26 | 2017-11-30 | The Florida International University Board Of Trustees | System and method for visible light communications with multi-element transmitters and receivers |
| CN208299801U (en) * | 2018-05-09 | 2018-12-28 | 广东金鉴检测科技有限公司 | A kind of reception terminal based on visible light communication |
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| CN203984609U (en) * | 2014-03-06 | 2014-12-03 | 鄢其力 | Based on the wireless sound box of LED visible light communication |
| US20170346559A1 (en) * | 2016-05-26 | 2017-11-30 | The Florida International University Board Of Trustees | System and method for visible light communications with multi-element transmitters and receivers |
| CN208299801U (en) * | 2018-05-09 | 2018-12-28 | 广东金鉴检测科技有限公司 | A kind of reception terminal based on visible light communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110557201A (en) * | 2019-08-09 | 2019-12-10 | 华南理工大学 | Multi-angle receiving device of underwater visible light communication mobile node |
| CN110557201B (en) * | 2019-08-09 | 2023-03-24 | 华南理工大学 | Multi-angle receiving device of underwater visible light communication mobile node |
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Address after: 312000 station 13, office 106, building 2, gateway living room, Caoe street, Shangyu District, Shaoxing City, Zhejiang Province Applicant after: Shaoxing Aifenghuan Communication Equipment Co.,Ltd. Address before: Workplace No. 13, 106 Office, Building 2, Gateway Living Room, e You Town, Cao'e Street, Shangyu City, Shaoxing City, Zhejiang Province, 312000 Applicant before: Shaoxing Aifenghuan Communication Equipment Co.,Ltd. |
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