CN107276670B - A kind of environmental monitoring intelligence visible light communication system and method - Google Patents
A kind of environmental monitoring intelligence visible light communication system and method Download PDFInfo
- Publication number
- CN107276670B CN107276670B CN201710300061.3A CN201710300061A CN107276670B CN 107276670 B CN107276670 B CN 107276670B CN 201710300061 A CN201710300061 A CN 201710300061A CN 107276670 B CN107276670 B CN 107276670B
- Authority
- CN
- China
- Prior art keywords
- visible light
- light communication
- module
- environmental monitoring
- pollutant concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
-
- 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
- H04B10/40—Transceivers
-
- 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
Abstract
The invention discloses a kind of environmental monitoring intelligence visible light communication system and methods, dual function with data transmission and environmental monitoring, including network access module, network signal processing module, the first and second visible light communication receiver-transmitter integrated modules, electronic signal processing module, local data processing module and cloud server module.Network signal enters after network signal processing module is converted into digital signal through network access module is sent into the first visible light communication receiver-transmitter integrated module, and the signal after electro-optic conversion reaches the second visible light communication receiver-transmitter integrated module through visible light channel by light emitting diode.Photodiode treated signal is sent into the network signal that electronic signal processing module obtains and is sent into processing locality and display module, realizes environmental monitoring by the function of fitting bit error rate and pollutant concentration, and result is uploaded cloud server module.Reliable data transmission and the monitoring to a variety of environment can be achieved in the present invention, realizes the intelligent transmission of visible light communication.
Description
Technical field
The present invention relates to a kind of visible light communication systems, more particularly to one kind to have data transmission and the dual function of environmental monitoring
The visible light communication system of energy.
Background technique
Visible light communication (Visible Light Communications, VLC) is in light emitting diode (Light
Emitting Diode, LED) etc. technically grow up the novel, short distance of one kind, high speed wireless communication technique.It with
LED is as light source, and using atmosphere or water etc. as transmission medium, what by sending naked eyes, imperceptible, high speed light and shade flashed can
Light-exposed signal transmits information, completes photoelectric conversion using photodiode (Photodiode, PD) in receiving end, then carries out
The transmitting of information is realized in the reception of electric signal, regeneration, demodulation.Compared with conventional wireless technology for radio frequency, VLC has frequency spectrum
It is resourceful and without application, not by electromagnetic interference, good confidentiality, green energy conservation, be harmful to human health, transmission rate height etc.
Advantage causes the extensive concern of academia and industrial circle in recent years.
From the point of view of current domestic and international present Research, the research emphasis of domestic and international expert and scholar focus primarily on high-speed
Under the development of VLC system and special environment condition on VLC systematic difference.In terms of the development of High Speed System, VLC communication system
Transmission rate from several million initial bits/s to a few Ji bits/s is constantly promoted, and has reached offline Ji bits/s up to a hundred now
Surprising rate, development prospect is very tempting.Application aspect in particular circumstances has been disclosed some special both at home and abroad
Benefit.Chinese patent CN105872449A, CN105911522A, CN105897529A, CN105933062A, CN205566308U points
Do not disclose visible light communication auto communication, wireless location, robot control, subsurface communication, in terms of answer
With.In addition, environmental pollution is serious for China certain areas, environmental monitoring seems extremely important.In terms of environmental monitoring, Chinese patent
CN201673121U disclose a kind of low detection limit, high-precision, the response time is very fast, can be used for it is a variety of detect occasions based on ring
The optical air quality detector in border can detect to continuous effective the environment such as NO, NO2, O3, CO and CO2, but problem is detection system
System is internal to be designed with measurement module to different types of gas, can inevitably increase the volume of product, reduce portable degree, fill
The process matched also can be more cumbersome, and cost can also be increase accordingly.2013/0278427 A1 of United States Patent (USP) US places sensor
In certain certain objects, and by detecting the environment around these certain objects with visible detection Environmental Technology.This
The problem of invention, is that the movement of object has very strong randomness and uncertainty, thus have in environment measurement it is very big not
Degree of certainty, and long range movement can allow sensor to receive a large amount of data information, but be not carried out the real-time biography with network
It is defeated, these information datas can be allowed to be difficult to be handled in time.It should be pointed out that Chinese patent CN201673121U and the U.S. are special
Sharp 2013/0278427 A1 of US is to need dedicated air quality detecting device or sensor, at high cost, expensive.
Summary of the invention
Technical problem: the present invention provide one kind while carrying out information transmission, can also carry out environmental monitoring based on
The environmental monitoring intelligence visible light communication system of data transmission and environmental monitoring, the system can detect a variety of environment, wrap
Include smokescope, the muddy degree of sewage etc. in atmosphere.Present invention simultaneously provides a kind of environmental monitoring intelligence visible light communications
Method.
Technical solution: environmental monitoring intelligence visible light communication system of the invention, including transmitting terminal, receiving end and be located at institute
The visible light channel between transmitting terminal and receiving end for the two visible light communication is stated, the transmitting terminal includes network insertion mould
Block, network signal processing module and the first visible light communication receiver-transmitter integrated module, the receiving end are received including the second visible light
Send out integrated module, electronic signal processing module, data processing module；The network access module to receive network signal and by its
Be sent to network signal processing module, the network signal processing module to by network signal be converted to digital signal and by its
It is sent to the first visible light communication receiver-transmitter integrated module, the first visible light communication receiver-transmitter integrated module is to by digital signal
It is converted to optical signal and it is sent to the second visible light communication receiver-transmitter integrated module by visible light channel, while receiving second
The optical signal that visible light communication receiver-transmitter integrated module is sent through visible light channel, the second visible light communication transceiver mould
Block is to receive optical signal that the first visible light communication receiver-transmitter integrated module is sent and be sent at electric signal after being converted
Module is managed, the electronic signal processing module is to convert digital signals into network signal and send it to data processing mould
Block, the data processing module obtain the pollutant concentration of preset test environment to handle the result of environmental monitoring.
Further, in present system, at least provided with a LED in two visible light communication receiver-transmitter integrated modules
With a PD, PD pairs of the LED of a visible light communication receiver-transmitter integrated module and another visible light communication receiver-transmitter integrated module
It answers, respectively constituted the forward link carried out data transmission and carries out the reverse link of Signalling exchange.
Environmental monitoring intelligence visible light communication method of the invention, comprising the following steps:
1) by the network access module of transmitting terminal, network signal processing module and the first visible light communication transceiver machine,
And the second visible integrated module of optical transceiver and electronic signal processing module of receiving end are placed on the adjustable training of pollutant concentration
In environment, fitting obtains pollutant concentration function, specifically: pollutant concentration given first, receiving end send a control letter
The bit sequence for allowing transmitting terminal to send a string of regular lengths is enabled, then receiving end receives bit information and calculates bit error rate, connects
Change pollutant concentration, obtain a series of bit error rate value with identical method, obtain the bit error rate and become with pollutant concentration
The curve of change obtains the pollutant concentration function that independent variable is bit error rate finally by the method for Function Fitting；
2) environmental monitoring intelligence visible light communication system is placed in true test environment, receiving end sends a control
Signaling processed allows transmitting terminal to send the bit sequence of a string of regular lengths, and then receiving end calculates according to the bit information received and misses
Bit rate, the independent variable then obtained with the step 1) are that the pollutant concentration function of bit error rate is calculated, and are obtained
Functional value is the pollutant concentration of preset test environment.
Further, in the method for the present invention, the Function Fitting in step 1) is Polynomial curve-fit.
Thinking of the invention is: firstly, building can carry out data transmission visible in the good situation of channel circumstance
Optical communication system；Then, when channel circumstance becomes environment to be detected, the bit error rate of receiving end is calculated, then fitting misses ratio
Curve between special rate and practical pollutant concentration estimates the concentration of current contamination according to gained bit error rate.
Technical solution of the present invention is divided into two parts: the technical solution of data-transformation facility and the skill of environment monitoring function
Art scheme.
(1) technical solution of data-transformation facility
Environmental monitoring intelligence visible light communication system of the present invention as shown in Figure 1, include transmitting terminal, visible light channel and
Receiving end.The transmitting terminal includes network access module, network signal processing module and the first visible light communication transceiver mould
Block；The receiving end include the second visible light communication receiver-transmitter integrated module, electronic signal processing module, local data processing module with
And cloud server module.
In transmitting terminal, the network access module is responsible for internet signal being linked into this system.The network
Signal processing module is responsible for handling network signal, is converted into digital signal.The first visible light communication transmitting-receiving one
Module executes electro-optic conversion, digital electric signal is converted into visible light signal, then light intensity signal is sent out by least one LED
It is shot out.
Then, optical signal is transmitted by visible light channel.The visible light channel is wireless channel, and becomes channel to be slow.
Under the free space environment of environment good (i.e. contamination-free), when transmitting-receiving end position is given, it is seen that the channel of optic communication increases
Benefit is constant.
Visible light signal reaches receiving end after visible light channel is transmitted.In receiving end, second visible light is logical
Believe that receiver-transmitter integrated module executes the operation opposite with the first visible light communication receiver-transmitter integrated module, namely carries out photoelectric conversion, it will
Light intensity signal is converted into digital signal.Then, by processing such as the electronic signal processing module amplification, filtering, demodulation, restore
Original digital signal out, to realize reliable transmission of the network signal on visible light medium.
(2) technical solution of environment monitoring function
In the good situation of channel circumstance, visible light communication system constructed by the present invention can be counted reliably
According to transmission.However, (such as: becoming cloudy in atmosphere full of smog, water) when channel circumstance deteriorates, channel gain can be deteriorated, and be
The performance of BER of system can be remarkably decreased.The concentration of pollutant and system bit error rate exist to correspond and close in adverse condition
System.Using this feature, the contaminated degree of environment can be monitored.
In order to realize environmental monitoring, the first visible light communication receiver-transmitter integrated module and the transmitting-receiving of the second visible light communication
Integrated module also at least places a PD and LED for constituting reverse link respectively and realizes the transmission of control signaling.
Specifically, environment monitoring function of this system based on bit error rate can be realized by following steps:
1. system is placed in the adjustable environment of pollutant concentration (referred to as training environment)
A) under training environment, the concentration of current contamination is set as h=0.
B) control signaling is sent out to transmitting terminal by reverse link in receiving end.Specifically, second visible light communication
Control signaling is sent at least the one of the first visible light communication receiver-transmitter integrated module by least one LED by receiver-transmitter integrated module
A PD.
C it is N's that) transmitting terminal, which sends a string length by least one LED of the first visible light communication receiver-transmitter integrated module,
Sequence of data bits.
D) in the system, the bit sequence that transmitting terminal known to receiving end is sent.The data bit of transmission is by visible
Reach the second visible light communication receiver-transmitter integrated module after optical channel transmission, the second visible light communication transceiver mould at least one
PD receives signal and after photoelectric conversion, is sent into processing locality and display module, and the bit number of mistake of statistics is Ne, thus
To bit error rate BER=Ne/N。
E h=h+D) is enabled, if h < 1, goes to step B)；Otherwise, step F is gone to).
F bit error rate) is drawn with the change curve of pollutant concentration；
G) curve obtained is fitted, obtains the pollutant concentration function that independent variable is bit error rate.
2. system is placed in true environment (referred to as prediction environment)
H gained pollutant concentration function) is stored in processing locality and display module；
I) utilize step B)-D) and method calculate bit error rate, then bring bit error rate into step G) in pollutant
Concentration function, gained functional value are predicted pollutant concentration.
J the information such as the bit error rate, pollutant concentration under current environment) are uploaded into cloud server module, are convenient for user
Real time access and inquiry at any time and any place.
The intelligence of present system is embodied in while carrying out data transmission, it can be achieved that environmental monitoring.Ring to be monitored
Border is between the first visible integrated module of optical transceiver and the second visible integrated module of optical transceiver, when pollutant concentration increases,
Channel is deteriorated, and system bit error rate can improve.There are one-to-one relationships with bit error rate for pollutant concentration in environment.It is described
System carries out environmental monitoring using this relationship.Present system can monitor a variety of environment, such as: the degree of smog, dirt in atmosphere
Muddy degree of water etc..
In the technology based on environmental monitoring, conventional method needs special instrument to be detected, at high cost, price.
Different from the patent of above-mentioned environmental monitoring, the present invention does not use dedicated detection device to carry out environmental monitoring, but according to wireless
Communication channel characteristics are monitored environment.The present invention is a visible light communication network first, can carry out normal network
Data transmission.The present invention can carry out environmental monitoring by the variation of receiver bit error rate while carrying out data transmission,
It kills two birds with one stone, the cost of system can be reduced to a certain extent, and realize intelligentized information transmission.
The utility model has the advantages that compared with prior art, the present invention having the advantage that
The present invention realizes reliable transmission of the network signal on visible light medium.The system is wireless transmission, thus
Efficiently avoid the complicated processes of traditional cable wiring；The system using visible light spectrum communicate, avoid traditional wifi,
Serious electromagnetic interference problem in the twireless radio-frequency communications such as 3G, 4G；Visible light communication has very big bandwidth, is rare biography
System twireless radio-frequency communication provides effective supplement, has well solved the problem of frequency spectrum resource shortage；Visible light communication is to human body
It is harmless, it can be safe to use.
The system does not need special environment monitoring device, but reflects dirt indirectly by system bit error rate index
The concentration for contaminating object, significantly reduces system cost.
The system has the dual function of data transmission and environmental monitoring, it can be achieved that big while data transmission
The real-time monitoring of the environment such as gas, sewage, it is powerful, improve the limitation that existing system has a single function.
The system can be convenient for user's real time access, in time in environmental monitoring data real-time storage to Cloud Server
Understand the contaminated situation of environment.After environment is contaminated is more than threshold value, warning message can also be sent.
Detailed description of the invention
Environmental monitoring intelligence visible light communication system block diagram of the Fig. 1 based on data transmission and environmental monitoring.
Fig. 2 environmental monitoring intelligence visible light communication system monitors sewage muddiness degree flow chart.
Fig. 3 environmental monitoring intelligence visible light communication system monitors atmosphere smokescope flow chart.
Specific embodiment
Below with reference to embodiment and Figure of description, the present invention is further illustrated.
Embodiment 1: sewage muddiness degree monitoring
Fig. 2 gives environmental monitoring intelligence visible light communication system monitoring sewage muddiness degree flow chart, which can divide
For following steps:
1) training environment is set, fills a certain amount of clear water (h=0 at this time) in a uncovered cuboid glass container,
And the container is placed among sending and receiving end.The transmission medium of visible light signal is water.
2) control signaling is sent out to transmitting terminal by reverse link in receiving end.
3) transmitting terminal sends the sequence of data bits that a string length is N.
4) receiving end receives sequence, and the bit number of mistake of statistics is Ne, calculate bit error rate BER=Ne/N。
5) ink, mud or other visible particle objects is added into existing glass container to change concentration of wastewater, makes concentration
Become h=h+D, if h < 1, goes to step 2)；Otherwise, it goes in next step.
6) bit error rate is drawn with the change curve of pollutant concentration.
7) curve obtained is fitted, obtains the sewage muddiness degree function that independent variable is bit error rate.
8) system is placed in true sewage detection environment, gained sewage muddiness degree function is stored in processing locality
And display module.
9) according to step 2) -4) the method calculates current bit error rate, and is brought into sewage muddiness degree function, institute
Obtain the muddy degree value that functional value is predicted sewage.Then monitoring data information is uploaded into cloud server module.
Embodiment 2: smokescope monitors in atmosphere
Fig. 3 gives environmental monitoring intelligence visible light communication system monitoring atmosphere smokescope flow chart.The process can divide
For following steps:
1) training environment is set, is full of air (h=0 at this time) in a cuboid closed glass container, and by the appearance
Device is placed among sending and receiving end.The transmission medium of visible light signal is atmosphere.
2) control signaling is sent out to transmitting terminal by reverse link in receiving end.
3) transmitting terminal sends the sequence of data bits that a string length is N.
4) receiving end receives sequence, and the bit number of mistake of statistics is Ne, calculate bit error rate BER=Ne/N。
5) modes such as smog are filled with into existing glass container to change the smokescope in atmosphere, concentration is made to become h=h
+ D goes to step 2) if h < 1；Otherwise, it goes in next step.
6) bit error rate is drawn with the change curve of pollutant concentration.
7) curve obtained is fitted, obtains the smokescope function curve that independent variable is bit error rate.
8) system is placed in true Smoke Detection environment, gained smokescope function curve is stored in processing locality
And display module.
9) according to step 2) -4) the method calculates current bit error rate, and is brought into smokescope function, gained letter
Numerical value is predicted smokescope value.Then monitoring data information is uploaded into cloud server module.
Above-described embodiment is only the preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill of the art
For personnel, without departing from the principle of the present invention, several improvement and equivalent replacement can also be made, these are to the present invention
Claim improve with the technical solution after equivalent replacement, each fall within protection scope of the present invention.
Claims (2)
1. a kind of environmental monitoring intelligence visible light communication method, which is characterized in that method includes the following steps:
1) by the network access module of transmitting terminal, network signal processing module and the first visible light communication transceiver machine, and
The visible integrated module of optical transceiver of the second of receiving end and electronic signal processing module are placed on the adjustable training environment of pollutant concentration
In, fitting obtains pollutant concentration function, specifically: pollutant concentration given first, receiving end sends a control signaling and allows
Transmitting terminal sends the bit sequence of a string of regular lengths, and then receiving end receives bit information and calculates bit error rate, then changes
Become pollutant concentration, obtains a series of bit error rate value with identical method, obtain what the bit error rate changed with pollutant concentration
Curve obtains the pollutant concentration function that independent variable is bit error rate finally by the method for Function Fitting；
2) environmental monitoring intelligence visible light communication system is placed in true test environment, receiving end sends a control letter
The bit sequence for allowing transmitting terminal to send a string of regular lengths is enabled, then receiving end calculates errored bit according to the bit information received
Rate is then calculated with the pollutant concentration function that the independent variable that the step 1) obtains is bit error rate, obtained function
Value is the pollutant concentration of preset test environment.
2. environmental monitoring intelligence visible light communication method according to claim 1, which is characterized in that in the step 1)
Function Fitting is Polynomial curve-fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710300061.3A CN107276670B (en) | 2017-05-02 | 2017-05-02 | A kind of environmental monitoring intelligence visible light communication system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710300061.3A CN107276670B (en) | 2017-05-02 | 2017-05-02 | A kind of environmental monitoring intelligence visible light communication system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107276670A CN107276670A (en) | 2017-10-20 |
| CN107276670B true CN107276670B (en) | 2019-08-02 |
Family
ID=60074283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710300061.3A Active CN107276670B (en) | 2017-05-02 | 2017-05-02 | A kind of environmental monitoring intelligence visible light communication system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107276670B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109147391A (en) * | 2018-09-06 | 2019-01-04 | 南京邮电大学 | Based on visible light communication intelligent transportation system and alarm method and spacing keeping method |
| CN112165358B (en) * | 2020-11-11 | 2023-08-15 | 上海第二工业大学 | Utilize haze of visible light technique to detect car networking |
| CN117554299B (en) * | 2024-01-09 | 2024-03-29 | 深圳华创芯光科技有限公司 | Visible light communication water quality monitoring method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986632A (en) * | 2014-06-03 | 2014-08-13 | 青岛东软载波科技股份有限公司 | Method for adding device to network through visible light |
| CN104104448A (en) * | 2014-07-16 | 2014-10-15 | 上海航天电子通讯设备研究所 | Visible light communication receiving and transmitting integrated device based on Ethernet |
| CN104618019A (en) * | 2015-01-23 | 2015-05-13 | 东南大学 | WiFi (wireless fidelity) access system based on visible light transmission and data frame transformation method |
| CN105588606A (en) * | 2014-10-24 | 2016-05-18 | 无锡蓝阳谐波科技有限公司 | Plant environmental monitoring system |
| CN106290089A (en) * | 2015-05-12 | 2017-01-04 | 杜晨光 | A kind of high-precision miniaturization particulate matter sensors |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130278427A1 (en) * | 2012-04-22 | 2013-10-24 | Michael Setton | Method and system for visually reporting a local environmental condition |
-
2017
- 2017-05-02 CN CN201710300061.3A patent/CN107276670B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986632A (en) * | 2014-06-03 | 2014-08-13 | 青岛东软载波科技股份有限公司 | Method for adding device to network through visible light |
| CN104104448A (en) * | 2014-07-16 | 2014-10-15 | 上海航天电子通讯设备研究所 | Visible light communication receiving and transmitting integrated device based on Ethernet |
| CN105588606A (en) * | 2014-10-24 | 2016-05-18 | 无锡蓝阳谐波科技有限公司 | Plant environmental monitoring system |
| CN104618019A (en) * | 2015-01-23 | 2015-05-13 | 东南大学 | WiFi (wireless fidelity) access system based on visible light transmission and data frame transformation method |
| CN106290089A (en) * | 2015-05-12 | 2017-01-04 | 杜晨光 | A kind of high-precision miniaturization particulate matter sensors |
Non-Patent Citations (1)
| Title |
|---|
| 水下可见光通信技术发展与应用;夏庆生;《水雷战与舰船防护》;20160531;37-42页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107276670A (en) | 2017-10-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107276670B (en) | A kind of environmental monitoring intelligence visible light communication system and method | |
| CN204886965U (en) | No linear light communication system based on photon counting | |
| Cailean et al. | Visible light communications cooperative architecture for the intelligent transportation system | |
| NO20023699L (en) | Monitoring transmitter power in a high-speed communication system | |
| CN205068129U (en) | Aquaculture quality of water intelligent monitoring system based on networking of wifi thing | |
| Ismail et al. | A review of visible light communication (VLC) technology | |
| CN110995347B (en) | LED visible light communication system suitable for road traffic safety | |
| CN108040339A (en) | Offline network-building method and its system based on LoRa | |
| Kumar | Visible light communication based traffic information broadcasting systems | |
| CN103873626A (en) | Mobile phone with function of monitoring oxygen content of air in real time | |
| CN108400821A (en) | Intelligent transportation system based on PPM modulation and intelligent transportation system | |
| CN103036616B (en) | Atmosphere wireless laser communication self-adaptation threshold judgment method based on pulse spectroscopic amplitude encoding/decoding | |
| DE60043949D1 (en) | Method and device for changing the transmission rate of a communication channel | |
| CN102208943B (en) | Demodulation method used for laser communication | |
| CN204421992U (en) | A kind of combustible gas metering arrangement and supervisory system | |
| CN204168552U (en) | A kind of street lamp with optical fiber wifi interface | |
| CN202918295U (en) | Single-channel ultraviolet (uv) light communication system | |
| CN102404049A (en) | Wireless optical communication system based on cloud scattering | |
| CN116030591A (en) | Intelligent inspection alarm system and method for mine external fire disaster based on Internet of things | |
| CN204204189U (en) | A kind of water quality monitoring system based on Internet of Things | |
| Qiang et al. | Indoor parking navigation system using visible LED light communication | |
| Scopigno et al. | The potential benefits of on-board Li-Fi for the cooperation among vehicles | |
| CN111313977B (en) | Information transmission method and device for quantum entanglement time sequence collapse | |
| CN205120993U (en) | Rainfall monitoring station based on 433 wireless transmission | |
| CN106712847A (en) | LIFI light based one-way transmission device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201028 Address after: Room 2, No.2, No.2, Kechuang Road, NO.201, Qixia District, Nanjing, Jiangsu Province Patentee after: Nanjing huaruizhiguang Information Technology Research Institute Co., Ltd Address before: 210003, No. 66, new exemplary Road, Nanjing, Jiangsu Patentee before: NANJING University OF POSTS AND TELECOMMUNICATIONS |
|
| TR01 | Transfer of patent right |