CN107707302A - LED-based closely point-to-point high speed and bidirectional data transfers system - Google Patents
LED-based closely point-to-point high speed and bidirectional data transfers system Download PDFInfo
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- CN107707302A CN107707302A CN201610642641.6A CN201610642641A CN107707302A CN 107707302 A CN107707302 A CN 107707302A CN 201610642641 A CN201610642641 A CN 201610642641A CN 107707302 A CN107707302 A CN 107707302A
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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
Abstract
The present invention relates to a kind of LED-based closely point-to-point high speed and bidirectional data transfers system, including at least two data transmission terminals, data transmission terminal described in wherein at least one are mobile terminal；The data transmission terminal includes：Bidirectional data communication module, for sending and receiving LED light signal；Main control module, starts and control data is received by LED light signal and the communication process of transmission；Data memory module, for storing the data for receiving and sending；The bidirectional data communication module includes physical layer device, MAC layer device and data/address bus；The physical layer device includes LED light signal transmitting terminal, receiving terminal and power supply.The system of the present invention can realize two-way point-point and short-dis-tance high speed data transfer, and the high speed data transfer of more than 100Mbps actual transmissions bit rate can be realized in 1 10cm short range.
Description
Technical field
The invention belongs to LED visible light wireless communication technology field, and in particular to a kind of LED-based closely point-to-point
High speed and bidirectional data transfers system.
Background technology
1880, the photographone that American scientist Bel is invented using him was tested, and speech range has reached 200
Rice, the success of the experiment are to carry out information transfer using visible ray to open early stage thinking.By the visible ray for lighting field,
To realize the visible light communication system of voice and data service, the research of this respect is big with white LED lamp in the past 20 years
Scale illumination is applied and gradually formed.With the rapid development of economy, people are provided and high speed instant messaging services the energy
The active demand of two aspects increasingly increases；On the one hand, LED has safe and efficient, green, low-power consumption, generate heat low, body
The advantages such as the small, long lifespan of product, so the application of high brightness light emitting diode LED at present, complete from the display field of early stage
Current lighting field and light beautification field are extend to, and is referred to as the lighting engineering of new century；On the other hand, LED is also
Possess that response sensitivity is high, modulating performance is good, transmission power is big, support multiband light beam wavelength-division multiplex, information to be not easy to reveal, nothing
Electromagnetic radiation and without wireless frequency spectrum certification etc. outstanding properties and advantage, so, the visible ray based on LED light emitting diodes without
The research and application of line communication technology, in fast-developing.Although have at present using the technologies such as bluetooth carry out closely without
The application example of line low-speed data communication, but bluetooth equipment has that power consumption is high, the rate of information throughput is relatively low, communication distance
It is short, be easily disturbed, the shortcomings of easy leakage security burner is not good enough[1].Other the short distance wireless communication technologies also have Wi-Fi LANs
Technology, RFID radio-frequency techniques, UWB super-broadband tech, ZIGBEE sensor technologies etc..These technologies belong to microwave or radio frequency leads to
Letter field, have businessman or user equipment cost it is higher, it is not easy to install, need to use radio wave to produce certain radiation, information
Transmit the shortcomings of easy leakage security can be poor.
For come the communication system of transmission signal, before 2000, just there is researcher using LED light emitting diodes
The imagination for proposing the light that sends using LED to be communicated, and it is committed to experimental system.Wherein representative is that Hong Kong is big
Grantham Pang in the implementation of 1999, build and demonstrate the low speed based on visible LED by its experiment group
Transmitting voice signal device.When these scenarios propose at that time, LED does not find broad application also in lighting field, to LED
Many key technologies of visible light communication are also not carried out certain research, so its influence power is limited.
2000, the research team of Japanese KEIO (Qing Ying private schools charging no tuition) university M.Nakagawa professors proposed white light LEDs reality
The scheme of existing indoor visible light access, and be modeled and calculate for indoor visible light communication channel, realize 10Mbps rooms
The access scheme of interior visible light communication, this achievement are considered as visible light communication（VLC）The influential initiative in field is ground
Study carefully work.2001 festivals answer other researchers of university of private school charging no tuition have studied and carry out visible light communication using traffic lights, and to being
The characteristics such as the modulation system of system, required signal to noise ratio and traffic rate have carried out analysis and summary.2004, M.Nakagawa religions
Award research team further to analyze the feasibility of LED indoor visible light communication system, light source is modeled, simulated more
The lower indoor illumination distribution of small cup LED irradiation, channel impulse response, and to having indoor signal to noise ratio distribution in the case of direct projection, signal
Between interference etc. parameter studied；And on this Research foundation, it is indicated that the receiving terminal angle of visual field is sufficiently small and transmission range
In the case of near enough, it is seen that the signal rate of optic communication is expected to reach G bit number magnitudes, and the system can be used as of future generation near
Apart from the selection scheme of high-speed radiocommunication system.2008, German Heinrich research institute propose using visible ray with it is infrared
Communication set is theoretically studied and proved to its feasibility into the imagination of family lan, and by using DMT（From
Dissipate multitone modulation）Modulator approach, 300Mbps communications system transmission speed is reached.2012, by using RGB three-color LEDs
With DMT modulation systems, interior realizes single led 800Mbps traffic rate.U.S. government opens in October, 2008 and provided
Plan of the key name for " wisdom illuminate (smart-lighting) " is helped, specializes in visible light communication technology, it is desirable to by can
See light light beam（Light Beam）The communication between wireless device and LED illumination device is realized, the plan invests 100,008,000 altogether
Ten thousand dollars, 10 years by a definite date, the researcher for having more than 30 universities participated in.2013 to 2014 years, it was reported that Clyde thinks in Britain
The researcher of university and Edinburgh University is tested New LED for VISIBLE LIGHT SYSTEM, and the speed of communication system is successively
1.5Gbps and 3Gbps are reached, this has established solid foundation for the realization of high speed visible light communication system.
In China, it is seen that the research starting of optic communication is than later, but development situation is good.2006, Xi'an University of Technology
Fourth moral it is strong et al. start to introduce the principle of visible light communication, and Primary Study has been carried out to visible light communication key technology.Together
Year, Hu Guoyong of Ji'nan University et al. proposes simultaneously to analyze the indoor Radio Communication System of white light LEDs, it is indicated that white light LEDs enter
Signal of communication can be also carried while row illumination, builds indoor wireless data network.2013, research team of Fudan University led to
AWG (AWG) generation ACO-OFDM signals are crossed, is loaded into respectively in the LED chip of different colours and carries out visible ray
Communications, can be reached by demonstrating total transmission frequency by hundreds of megahertzs.In April, 2013, China " 12 " National 863 plan
" visible light communication system key technology research " theme project can be held in Zhengzhou, and meeting is primarily upon visible light communication key skill
The research of art, laid a good foundation for the industrialization of this novel green information technology.The project can accelerate domestic visible ray to lead to
Letter technology develops with having played important function in terms of commercial application, meanwhile, the visible light communication in China is also show from early stage
Simple Theory analysis and simulation stage, the experiment of the actual high-speed transfer under complicated modulation methods of progressively having marched toward and apply rank
Section.From 2008 so far, Zhu Na, Jiang Xiaoming of Jiangsu University's optoelectronic communication research institute et al., to LED visible light voice communication
Studied with data communication system, multiple application scenarios have carried out theory indoors, on traffic lights and in mine etc.
Calculate analysis to develop with experimental products, published several research papers, applied and authorize several domestic patents of invention.
At present, under the increasingly increased application background of mobile Internet data transmission demand, how both to have ensured that information communicated
Safety, and can realize the point-to-point quick mutually biography, and further realize real portable storage of the big file big data between good friend,
It is problem that is a series of very severe and meriting attention.Such as in smart mobile phone（And other intelligence systems）Utilization in：It is first
First, smart mobile phone possesses certain big file memory function, and how to realize the point-to-point fast and safely communications of big file
With information sharing, at present in terms of bottom communication, the method that can be used only has two major classes.The first kind is wire transmission, wired
In the case that transmission realizes that big data is shared, either transmitted by USB modes, or by wired network port transmission, all exist
：Cable carrying is inconvenient, leakage of information can only be easily caused by local network transport, point-to-point transmission needs to pass through twice very
To the interfaces such as multiple copy and forwarding, USB for the big file big data transmission rate of G bit-levels very low consumption when it is very long etc. many
Problem and limitation.Second class is is wirelessly transferred, as described in background section first paragraph, the near radio information transmission technology
Mainly there are bluetooth, Wi-Fi LANs, RFID radio frequencies, UWB ultra wide bands, ZIGBEE wireless sensers etc., these technologies all belong to
Microwave or radio communication, have：Businessman with user cost is higher, forwarding unit is not easy to install, needs to use radio wave to cause
Electromagnetic radiation, information security performance is poor, message transmission rate is low, Wi-Fi WLANs need campus network etc. is many to lack
Point.
LED-based high sensitivity modulating characteristic and the characteristic of point-to-point FSO, LED/PD communication systems
With the great ability for closely receiving and dispatching big data signal, a kind of emerging short distance high-speed radiocommunication system can be built.
Chinese patent CN103490812B discloses a kind of mobile phone near field communication system and method based on visible ray, physical layer data hair
Sending end is made up of the visible ray display screen of existing mobile device with light sensor and other auxiliary circuits, by for showing
System led screen regional luminance change, carry out the modulation transmissions data to be sent, receiving terminal is also by system led screen and light
Line sensor and auxiliary circuit receive.Because current system screen is larger, the brightness power that it is used to show is again smaller, can also
The problems such as low-power for LED screen occur shows light scattering serious interference, and the grade of brightness change is difficult to fast resolution, so should
Method can be used in the case where mobile payment, mobile phone match somebody with somebody reciprocity low bit rate information exchange, but must be quasi-optical more than 100,000,000
Under the weak modulation of light intensity of fiber communication speed, it is difficult to distinguish actual high speed reception signal, it is impossible to realize that closely G bit rates are at a high speed
Visible ray wireless data transmission.
The content of the invention
It is an object of the present invention to the defects of overcoming prior art to exist, there is provided one kind can be realized closely point-to-point
The high speed and bidirectional data transfers system of high speed transmission data.
To realize above-mentioned technical purpose, the present invention adopts the following technical scheme that：
A kind of LED-based closely point-to-point high speed and bidirectional data transfers system, the system pass including at least two data
Defeated terminal, data transmission terminal described in wherein at least one are mobile terminal；The data transmission terminal includes：
Bidirectional data communication module, for sending and receiving LED light signal；
Main control module, starts and control data is received by LED light signal and the communication process of transmission；
Data memory module, for storing the data for receiving and sending；
The bidirectional data communication module includes physical layer device, MAC layer device and data/address bus；The physical layer device includes
LED light signal transmitting terminal, receiving terminal and power supply；The LED light signal transmitting terminal includes signal modulation coding circuit chip, preposition
Amplification and pre-equalization circuit, LED drive circuit and LED light source；The data signals carry of MAC layer encapsulation passes through in data/address bus
Signal modulation coding circuit chip carries out carrier wave coded modulation and parallel-serial conversion, the signal after coding by preposition amplification with it is pre-
After the processing of circuit that weighs, as driving current, it is loaded on LED drive circuit, LED light source is sent optical signal；The LED light letter
Number receiving terminal includes PD light-sensitive detectors, PD light-sensitive detector circuits, analog-to-digital conversion and signal amplification and equalizing circuit and signal
Demodulating and decoding circuit chip；PD light-sensitive detectors receive optical signal, and the signaling bearer of reception passes through the photosensitive spies of PD in data/address bus
Survey device circuit and be converted into electric signal, the electric signal regeneration reducing of output is by analog to digital conversion circuit and signal amplification with equalizing circuit
Data signal, is then amplified and equalization filtering to signal, is decoded finally by signal demodulating and decoding circuit chip, then carry out
Receiving signal demodulation, and receiving terminal MAC layer is sent back to, recover the data of transmitting terminal transmission；The MAC layer and PHY physical layers
Between pass through MII interfaces carry out data interaction.
Wherein, the communication distance of the visible light communication channel is between optical communication channel communication distance is 1cm--10cm,
Described device LED light signal transmitting end signal transmitting visual angle is no more than 30 degree.Because the internal illumination of intelligent mobile terminal is with leading to
The outer layer of letter LED possesses light shield technique, so described device is able to ensure that in optical communication channel communication distance be 1cm--10cm
Between when, LED light signal transmitting end signal transmitting visual angle and light PD signal receiving ends receive visual angle and are respectively less than or equal to 30
Degree.Maximum is no more than 30 degree.
The LED light source of the LED light signal transmitting terminal is white light LEDs light emitting diode or emitting led array；Its general power
Not less than 20 milliwatts.
Signal modulation coding circuit chip and signal the demodulating and decoding circuit chip selects ARM singlechip chips.
In order to prevent occurring excessive 0 in transmission and LED light source is not lighted, Signal coding is using Difference Manchester volume
Code, when signal is ' 1 ', it is encoded to ' 10 '；When signal is ' 0 ', ' 01 ' is encoded to, avoids the occurrence of long ' 1 ' or long ' 0 ' phenomenon.
The PD photosensitive detectors select PIN photodiode, and receiver wavelength range is 400nm ~ 700nm, peak response
Wavelength is 430nm ~ 550nm.
Signal amplification and the equalizing circuit of the transmitting terminal and receiving terminal use the master with automatic gain control function to put
Big device come realize signal among amplify.
The MAC layer is using raw socket transmitting-receiving mac frame.
As a further improvement on the present invention, the bidirectional data communication module can be installed in the form of external or be built-in
In the terminal, the terminal includes computer, mobile phone, flat board etc..
The bidirectional data communication module is installed in the form of built-in in the terminal, with the data/address bus of mobile terminal
Physical layer, MAC layer with network card chip are communication interface, the embedded bus modulated signal on the data/address bus of Mobile terminal main board
Drive circuit；Light source uses the light emitting LED lamp or luminous for being used for night illumination in mobile terminal and aiding in taking pictures under dark background
LED array.
The system of the present invention can realize the quick G bits between the point-to-point terminal of good friend in the epoch of mobile Internet
The real-time Transmission of the big file big data of rate, more than 100Mbps actual transmissions ratio can be realized in 1-10cm short range
The high speed data transfer of special rate, also, the use by LED visible light communication system in short-distance mobile phone interconnection, progressively take
For traditional wire cable, closely file transmits and realizes storage with radio magnetic wave.Due to strategy proposed by the present invention and method
And the physical layer and the specific technology on upper strata realize step, there is above-mentioned substantial amounts of early-stage Study basic and wide reality
Application scenarios, so, popularization and application of the invention, will there are wide prospect and significant advantage.
Brief description of the drawings
Fig. 1 is a kind of embodiment of the closely point-to-point high speed and bidirectional data transfers system of the present invention；
Fig. 2 is the another embodiment of the closely point-to-point high speed and bidirectional data transfers system of the present invention；
Fig. 3 is the structural representation of data transmission terminal of the embodiment of the present invention；
Fig. 4 is transmitting device physical layer schematic diagram of the present invention；
Fig. 5 is the waveform configuration figure after LED digital baseband signal channel codings；
Fig. 6 is the strong and weak modulation of LED light and driving circuit section structure；
Fig. 7 is apparatus of the present invention receiving terminal and control system schematic diagram；
Fig. 8 is the decoded oscillogram of PD light-sensitive detector digital baseband signal channels；
Fig. 9 is to be directly connected to transmitter/receiver circuit external connection module schematic diagram by ethernet line；
Figure 10 is the hierarchical structure schematic diagram of system；
Figure 11 is the main signal schematic flow sheet of MII interfaces；
Figure 12 is to be based on raw socket（Raw Socket）Rapid data point-to-point transmission protocol method software flow pattern.
Embodiment
Below in conjunction with brief description of the drawings and embodiment, technical scheme is further described.
A kind of LED-based closely point-to-point high speed and bidirectional data transfers system, the system include at least two numbers
According to transmission terminal, data transmission terminal described in wherein at least one is mobile terminal.As Figure 1-Figure 2, two in the system
The terminal of individual data transfer can be the mobile terminals of two transmission data, or the fixed terminal such as mobile terminal and computer.
As shown in figure 3, the data transmission terminal includes：Bidirectional data communication module, for sending and receiving LED light letter
Number；Main control module, starts and control data is received by LED light signal and the communication process of transmission；Data memory module, it is used for
The data that storage is received and sent.
As shown in figure 4, the bidirectional data communication module includes signal transmitting terminal and receiving terminal this two parts, belong to two
Different threads, respective independent operating are independent of each other, and form full-duplex communication Transmission system.
Transmitting terminal：LED light signal transmitting terminal include signal modulation coding circuit chip, it is preposition amplification with pre-equalization circuit,
LED drive circuit and LED light source；The data signals carry of MAC layer encapsulation passes through signal modulation coding circuit core in data/address bus
Piece carries out carrier wave coded modulation and parallel-serial conversion, the signal after coding by preposition amplification with after pre-equalization circuit processing, as
Driving current, it is loaded on LED drive circuit, LED light source is sent optical signal.
Transmitting terminal connection 5V or so DC voltage, by biasing voltage-stabilizing device, ensures that the voltage on emitter is
3.3V.MAC layer encapsulation needs the baseband digital signal for the big file big data transmitted, and carries out the modulation of OFDM high speeds sub-carrier code
With parallel-serial conversion, then LED drive circuit is loaded into using the signal after Difference Manchester channel coding as driving current again
On, light source is triggered by high-frequency transistor circuit in LED drive circuit and sends strong and weak different optical signal, so as to by can
See the corresponding data-signal of optical signal transmission.In order to prevent occurring excessive 0 in transmission and lamp is not lighted, compiled using graceful Chester
Code, when signal is ' 1 ', it is encoded to ' 10 '；When signal is ' 0 ', ' 01 ' is encoded to, the way is advantageous to system clock extraction,
The communication quality of raising system, avoid the occurrence of long ' 1 ' or long ' 0 ' phenomenon.After LED light special digital baseband signal channel coding
Waveform configuration is as shown in Figure 5.
Accompanying drawing 6 is the strong and weak modulation of LED light and driving circuit section structure.Modulation circuit is according to the LED light on and off thresholdings of calculating
Magnitude of voltage Vg is designed, and is completed illumination and is shared with data signal transmission.When signal is ' 1 ', the voltage at LED both ends reaches higher than Vg
It is shinny to normal working voltage scope, LED；When signal is ' 0 ', the voltage at LED both ends is less than Vg, and LED extinguishes.Bi-directional data
When communication module is built in the systems such as mobile phone, to ensure system led light source night normal illumination when no signal inputs, be
Solve this problem and design modulation circuit.The circuit workflow is：When no signal, modulation circuit disconnects, lighting circuit work
Make；And when having signal, lighting circuit disconnects, modulation circuit work, as shown in Figure 6.
Receiving terminal：LED light signal receiving terminal includes PD light-sensitive detectors, PD light-sensitive detector circuits, analog-to-digital conversion and letter
Number amplification with equalizing circuit and signal demodulating and decoding circuit chip；PD light-sensitive detectors receive optical signal, the signaling bearer of reception
In data/address bus, electric signal, analog to digital conversion circuit and signal amplification and equalizing circuit are converted into by PD light-sensitive detector circuits
It is data signal by the electric signal regeneration reducing of output, then signal is amplified and equalization filtering, finally by signal solution
The decoding of code circuit chip is reconciled, then carries out receiving signal demodulation, and sends back to receiving terminal MAC layer, recovers transmitting terminal transmission
Data.
As shown in fig. 7, PD light-sensitive detectors collect the optical signal for having modulated data that LED light emitting diodes are sent.Photoelectricity
Modular converter converts optical signals into current signal, and electric signal is amplified, the output signal of photoelectric detector, before first passing through
Amplifier denoising amplification is put, then suitable level value is further amplified to by rear class main amplifier, reception signal is in decoding
It is preceding also to carry out data clock recovery.The encoded signal of regeneration carries out Difference Manchester channel decoding through decoder, and decoding is former
Reason is as shown in Figure 8.It is further described below for the Photoelectric Detection of core with drive module and amplification, balanced decision circuit.
1st, Photoelectric Detection and driving（Light-receiving/opto-electronic conversion）
The effect of PD light-sensitive detectors is that the optical signal received is converted to electric current, and the requirement to photoelectric detector is that high photoelectricity turns
Change efficiency, low additional noise and quick response.Photoelectric detector selection silicon PIN photoelectric diode in the present embodiment, received wave
Long scope is 400nm ~ 700nm, can filter out infrared light interference, peak response wavelength is 430nm~550nm（Bluish-green wave band, white light
Main launch wavelength during LED normal works）.
2nd, amplification, balanced decision circuit
Photoelectric current caused by PD light-sensitive detectors is fainter, signal is correctly adjudicated, it is necessary to amplifying, being balanced, after filtering
Electric signal afterwards first passes around preposition amplification.The output voltage of signal after preposition amplification is typically relatively low, can not meet follow-up equal
Input voltage requirement needed for weighing apparatus and decision circuit is, it is necessary to further signal amplification.In the present embodiment, using with AGC
（Automatic growth control）The main amplifier of function come realize signal among amplify.
The system of the present invention can connect the bidirectional data communication module of data transmission terminal in system as external device
To other systems, for the mobile terminal in system, in terms of physical layer device, using the USB interface of mobile terminal, access is originally
The bidirectional data communication module of invention, for fixed PC and PAD, using its network interface or USB port, access the two-way of the present invention
Data communication module；To reach big file big data quickly transmission and the purpose further effectively stored.Outside using fixed network interface
The structural representation for connecing apparatus of the present invention is as shown in Figure 9.
System proposed by the present invention, normal premise is connected at a high speed in data transmission terminal physical layer short distance dual-thread
Under, it is also proposed that it is related to match system schema of the MAC layer with software control application layer.System physical layer realize good friend's system it
Between the mode of closely high-rate data stream transmit；MAC layer realizes that data are packaged in units of frame, and carries out adjacent set
Port numbers docking between standby, in order to eliminate too fat to move data traffic control, it is proposed that the method for rapid data transmission forwarding；It is soft
Part control application layer is responsible for establishing between the big file of big data, coordinates the supporting raw socket Socket of MAC layer connection to hold
Hand control protocol.The hierarchical structure schematic diagram of system is as shown in Figure 10.
Between the MAC layer and PHY physical layers of system business under above-mentioned application scenarios, mainly MII interfaces are used
（Medium Independent Interface, media independent layer interface）Carry out data interaction, it is ensured that the transmitting-receiving of data frame
Integrality, correctness.During interlayer communication, the main signal that MII interfaces are related to is as shown in Figure 8.In figure, arrow
Point to the direction of transfer between the MAC layer and physical layer that represent signal.Wherein prefix represents MAC layer to PHY for the signal of " TX "
The signal used is needed when layer sends data, prefix " RX " represents to need the signal used when MAC layer receives the data of PHY layer.
CLK represents that clock signal is examined, and " TX-EN " represents that encapsulation starts, and " TX-ER " represents that encapsulation terminates, and " RX-DV " represents decapsulation
Start, " RX-ER " represents that decapsulation terminates, " CRS " and " COL " respectively as carrier sense and the indication signal of collision detection,
To MAC layer fed-back channel status.MDC and MDIO signals are the two-way PLC signal of data transfer.
The invention also provides a kind of new based on raw socket（Raw Socket）The point-to-point biography of rapid data
Defeated protocol method, this method are particularly well suited for use under the application scenarios described in present system, can eliminate TCP/UDP
Too fat to move data traffic control process, realize point-to-point double ended system business software docking layer between data flow quickly pass
Defeated, because the Point-to-Point Data Transmission based on udp protocol, its efficiency is much larger than Transmission Control Protocol, but its shortcoming is because UDP is face
To connectionless mode, easily produce packet loss and sorted the problems such as chaotic with receiving terminal.The present invention proposes docking operation and uses original
Beginning socket raw socket, the UDP under this application scene head addition flag bit, to realize that customized software docks
The data structure of layer.So on software docking layer, the sequence and packet loss that realize receiving terminal retransmit.It is of the present invention
Udp protocol software flow pattern is as shown in figure 12, and idiographic flow is as follows：After initialization apparatus, selection needs the file sent, obtains
Fileinfo, fileinfo is read, after the fileinfo progress data compression of reading, create original socket, detection receives
Whether the original socket in side creates, if do not created, repeats to detect, if created, self-defined UDP heads, starts text
Part is sent, and gives file to corresponding original socket, whether detection file is sent completely, if do not sent, continues to connect
Receive, and whether inspection data is correct, if error in data, it is required that retransmission data, data are correct, then the data of reception are carried out
Sequence decompression, writes file, after file is sent completely, flow terminates afterwards.The software algorithm has given up conventional TCP in point-to-point biography
The too fat to move algorithm of the limitation transmission speeds such as defeated middle flow control, both ensure that the rapidity of data connection, and had taken into account connection again
The correctness of reliability and pp file transmission.
The system of the present invention can realize the closely high-speed communication between terminal device.The existing LED illumination lamp of utilisation system
The wireless visible ray optical transport of high-speed data signal is carried out, bottom communication and upper strata reduced form are carried out by using LED visible light
Data docking calculation, come complete the real-time point-to-point of big file big data wireless transmission and receive, can be bigger in life
Scope, using ubiquitous smart mobile phone and intelligence system come transmission information with store big file big data, reach illumination,
Communicate and be used in combination, realize the recycling of resource.In addition, radiofrequency signal is harmful can not unrestrictedly to increase transmission power.
And what LED illumination light source was sent is visible ray, more green, safety, Communication Jamming is few, and without radio-frequency spectrum.So this
System also has the features such as safety and environmental protection, Applied economy, easy-to-use energy-conservation.
Claims (10)
1. a kind of LED-based closely point-to-point high speed and bidirectional data transfers system, it is characterised in that the system is included extremely
Few two data transmission terminals, data transmission terminal described in wherein at least one is mobile terminal；The data transmission terminal bag
Include：
Bidirectional data communication module, for sending and receiving LED light signal；
Main control module, starts and control data is received by LED light signal and the communication process of transmission；
Data memory module, for storing the data for receiving and sending；
The bidirectional data communication module includes physical layer device, MAC layer device and data/address bus；The physical layer device includes
LED light signal transmitting terminal, receiving terminal and power supply；The LED light signal transmitting terminal includes signal modulation coding circuit chip, preposition
Amplification and pre-equalization circuit, LED drive circuit and LED light source；The data signals carry of MAC layer encapsulation passes through in data/address bus
Signal modulation coding circuit chip carries out carrier wave coded modulation and parallel-serial conversion, the signal after coding by preposition amplification with it is pre-
After the processing of circuit that weighs, as driving current, it is loaded on LED drive circuit, LED light source is sent optical signal；The LED light letter
Number receiving terminal includes PD light-sensitive detectors, PD light-sensitive detector circuits, analog-to-digital conversion and signal amplification and equalizing circuit and signal
Demodulating and decoding circuit chip；PD light-sensitive detectors receive optical signal, and the signaling bearer of reception passes through the photosensitive spies of PD in data/address bus
Survey device circuit and be converted into electric signal, the electric signal regeneration reducing of output is by analog to digital conversion circuit and signal amplification with equalizing circuit
Data signal, is then amplified and equalization filtering to signal, is decoded finally by signal demodulating and decoding circuit chip, then carry out
Receiving signal demodulation, and receiving terminal MAC layer is sent back to, recover the data of transmitting terminal transmission；The MAC layer and PHY physical layers
Between pass through MII interfaces carry out data interaction.
2. closely point-to-point high speed and bidirectional data transfers system according to claim 1, it is characterised in that described visible
Within the communication distance of optical communication channel is between 1cm -10cm, the data transmission terminal LED light signal transmitting end signal hair
Penetrate visual angle and receive visual angle no more than 30 degree with LED light signal receiving end signal.
3. closely point-to-point high speed and bidirectional data transfers system according to claim 1, it is characterised in that the LED
The LED light source at optical signal launch end is white light LEDs light emitting diode or emitting led array, and its general power is not less than 20 milliwatts.
4. closely point-to-point high speed and bidirectional data transfers system according to claim 1, it is characterised in that the signal
Modulating-coding circuit chip and signal demodulating and decoding circuit chip select ARM singlechip chips.
5. closely point-to-point high speed and bidirectional data transfers system according to claim 1, it is characterised in that Signal coding
Using Differential Manchester Encoding, when signal is ' 1 ', ' 10 ' are encoded to；When signal is ' 0 ', ' 01 ' is encoded to.
6. closely point-to-point high speed and bidirectional data transfers system according to claim 1, it is characterised in that the PD light
Responsive detectors select PIN photodiode, and receiver wavelength range is 400nm ~ 700nm, peak response wavelength be 430nm ~
550nm。
7. closely point-to-point high speed and bidirectional data transfers system according to claim 1, it is characterised in that the transmitting
The amplification of the signal of end and receiving terminal realizes signal with equalizing circuit using the main amplifier with automatic gain control function
Centre amplification.
8. closely point-to-point high speed and bidirectional data transfers system according to claim 1, it is characterised in that the MAC
Layer is using raw socket transmitting-receiving mac frame.
9. the closely point-to-point high speed and bidirectional data transfers system according to any one of claim 1 ~ 8, it is characterised in that
The bidirectional data communication module is installed in the terminal in the form of external or be built-in.
10. closely point-to-point high speed and bidirectional data transfers system according to claim 9, it is characterised in that described double
Installed in the terminal in the form of built-in to data communication module, with the data/address bus of mobile terminal and the thing of network card chip
Manage layer, MAC layer is communication interface, the drive circuit of embedded bus modulated signal on the data/address bus of Mobile terminal main board；Light
Source, which uses, is used for night illumination and the light emitting LED lamp for aiding in taking pictures under dark background or emitting led array in mobile terminal.
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| CN201610642641.6A CN107707302A (en) | 2016-08-08 | 2016-08-08 | LED-based closely point-to-point high speed and bidirectional data transfers system |
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| CN113037375A (en) * | 2019-12-09 | 2021-06-25 | Oppo广东移动通信有限公司 | LiFi communication control method, device, equipment and medium for electronic equipment |
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| CN114040351A (en) * | 2021-10-21 | 2022-02-11 | 郑州大学第一附属医院 | Wearable children breathe monitored control system based on near field communication |
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