CN112087261A - Physical isolation one-way transmission equipment for visible light communication - Google Patents
Physical isolation one-way transmission equipment for visible light communication Download PDFInfo
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- CN112087261A CN112087261A CN202010997683.8A CN202010997683A CN112087261A CN 112087261 A CN112087261 A CN 112087261A CN 202010997683 A CN202010997683 A CN 202010997683A CN 112087261 A CN112087261 A CN 112087261A
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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
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
- H04B10/6971—Arrangements for reducing noise and distortion using equalisation
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention provides a physical isolation one-way transmission device for visible light communication. The apparatus comprises: sending end equipment and receiving end equipment, sending end equipment includes: send special treatment board of send end VLC and VLC send the drive plate, and receiving end equipment includes: receiving end VLC special processing board and VLC receive equalizer plate, VLC send the drive plate to include a plurality of VLC send module, VLC receive equalizer plate includes a plurality of VLC receive module, VLC receive module and VLC send module correspond the setting, VLC send module will modulate good signal loading to LED on, will be loaded with the visible light of signal through LED and launch to corresponding VLC receive module in free space. The visible light communication physical isolation one-way transmission equipment provided by the invention can realize effective communication between the equipment which are physically isolated from each other by utilizing visible light communication.
Description
Technical Field
The invention relates to the technical field of visible light communication, in particular to a physical isolation one-way transmission device for visible light communication.
Background
In the existing various communication systems, two parties participating in communication are not isolated from each other. Taking an optical fiber communication system as an example, a sending party and a receiving party are connected with each other through an optical fiber. Taking the bluetooth communication system as an example, the sender and the receiver are connected to each other through bluetooth wireless connection.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a visible light communication physical isolation one-way transmission device, which can realize effective communication between devices which are physically isolated from each other by using visible light communication.
In order to solve the above technical problem, the present invention provides a physical isolation unidirectional transmission device for visible light communication, comprising: sending end equipment and receiving end equipment, sending end equipment includes: send special treatment board of send end VLC and VLC send the drive plate, and receiving end equipment includes: receiving end VLC special processing board and VLC receive equalizer plate, VLC send the drive plate to include a plurality of VLC send module, VLC receive equalizer plate includes a plurality of VLC receive module, VLC receive module and VLC send module correspond the setting, VLC send module will modulate good signal loading to LED on, will be loaded with the visible light of signal through LED and launch to corresponding VLC receive module in free space.
In some embodiments, the sending end device is connected to the sending end computer through a GigaE portal, and the receiving end device is connected to the receiving end computer through a GigaE portal.
In some embodiments, the sending device communicates with the sending computer via ethernet frames, and the receiving device also communicates with the receiving computer via ethernet frames.
In some embodiments, the transmitting-end VLC special processing board performs protocol conversion on the received ethernet frame, and converts the original TCP protocol into a custom network protocol; then, the data after protocol conversion is processed by serial-parallel conversion, channel coding, line coding and M sequence addition; and finally transmitting the modulated data to a VLC sending module.
In some embodiments, the VLC transmit module also efficiently drives, pre-equalizes, the input data prior to loading the modulated signal onto the LEDs.
In some embodiments, after receiving the light waves loaded with signals, the VLC receiving module restores the light signals into electrical signals and transmits the electrical signals to the receiving end VLC special processing board after photoelectric conversion, multi-stage amplification and frequency domain equalization.
In some embodiments, the VLC special processing board performs operations of removing an M sequence, line decoding, and channel decoding on the received data, performs protocol conversion on the demodulated signal, and restores the customized network protocol to the TCP protocol; and finally, the recovered Ethernet frame is sent to a receiving end computer through the GigaE gigabit network port.
In some embodiments, the visible light communication physical isolation unidirectional transmission device has a file sending function, a text message sending function, a designated file retransmission function, a log reporting function, a local IO device management function, a trojan killing function, and a patch repairing function.
In some embodiments, the visible light communication physically isolates the data transmission rate of the unidirectional transmission device from 1000 Mbit/s.
In some embodiments, the bit error rate of the physical isolation unidirectional transmission equipment for visible light communication is not lower than 10-12。
After adopting such design, the invention has at least the following advantages:
(1) physical partition of transmission medium
The visible light one-way transmission equipment is spatially separated from the transceiver module, so that the transceiver module and the transceiver module are completely physically separated.
(2) Reverse optical signal optical suppression
The loss of the reverse optical signal mainly comes from the diffusion of the optical device to the reverse optical signal, and the loss of the reverse link is as high as 60dB according to the optical device adopted by the current product.
(3) Unidirectional conduction of transmitting and receiving devices
The emitting device LED and the PD at the receiving end are both diodes, so that the LED has stronger one-way conductivity. Of course, the PD acts as a diode, and still has the possibility of emitting a weak optical signal, and similarly, the LED can also act as a receiving device. However, the PD radiates an extremely weak optical signal, and the LED also has an extremely weak receiving capability.
(4) Filtering of equipment equalization circuit
In order to extend the modulation bandwidth of the LED, a pre-equalization circuit is placed in the emission front-end, which has a 60dB attenuation in the low frequency band. If an optical signal is radiated from the reverse link and enters the LED to reach the equalization circuit, the signal is also attenuated by 60 dB.
In summary, compared with the optical fiber unidirectional lead-in device, the visible light unidirectional transmission device has higher safety, the visible light is physically separated, the reverse link isolation degree of the visible light unidirectional transmission device increases the loss of a reverse optical signal and the loss of a device equalization circuit, and the two losses are not possessed by the optical fiber unidirectional lead-in device. Compared with the lead-in mode of burning CD, the visible light one-way transmission equipment has the advantages of high speed, low cost and the like.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic structural diagram of a physical isolation unidirectional transmission device for visible light communication according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The equipment adopts a visible light communication special processing board and a visible light communication module to realize the one-way transmission of information. The visible light has good secrecy effect in the aspect of information transmission due to the characteristics of unidirectional transmission, easy shielding and the like. The device communicates with the computer through the Ethernet port, the sending end computer is connected with the GigaE (gigabit Internet port) of the product, the receiving end computer is connected with the other GigaE interface of the product, the communication process is unidirectional transmission from the physical layer to the application layer, the effect of physical isolation is achieved, the safety is high, the safe unidirectional transmission of data between different networks and devices is realized, namely, the data of the high-density network (device) is ensured not to be leaked to the low-density network (device).
As shown in the figure, the block diagram of the visible light communication physical isolation unidirectional transmission device mainly comprises a visible light transmitting device and a receiving device, wherein the transmitting device and the receiving device are independently powered. The visible light transmitting apparatus includes a VLC dedicated processing board (digital board) and a VLC transmitting drive board (analog board), and the receiving apparatus includes a VLC dedicated processing board (digital board) and a VLC receiving equalizing board (analog board). After the power-on is started, the sending end computer runs a sending program interface, a file in a computer disk is clicked through the program interface, a sending button is clicked after a specific file is selected, namely, a sending protocol program is informed to send a file to be transmitted, and the sending protocol program finally sends data to the VLC special processing board through a GigaE gigabit network port by using Socket. The VLC special processing board performs protocol conversion on the received Ethernet frame, and converts the original TCP protocol into a user-defined network protocol; then, the data after protocol conversion is processed by serial-parallel conversion, channel coding, line coding, M sequence addition and the like; and finally transmitting the modulated data to a VLC sending module. The transmitting optical module loads the modulated signal to the LED through the steps of efficient driving, pre-equalization and the like on the input data, and the visible light loaded with the signal is emitted in a free space through the LED. After receiving the light waves loaded with signals, the receiving optical module restores the optical signals into electric signals and transmits the electric signals to a VLC special processing board after the steps of photoelectric conversion, multistage amplification, frequency domain equalization and the like; the VLC special processing board removes M sequences, line decoding, channel decoding and other operations from the received data, performs protocol conversion on the demodulated signals, and restores the self-defined network protocol into a TCP (transmission control protocol); and finally, the recovered Ethernet frame is sent to a receiving terminal host through a GigaE gigabit network port, a receiving program interface is operated on the terminal, a receiving protocol analysis program can analyze data transmitted by the VLC special processing board through GigaE by using Socket and display a corresponding state, after the file is successfully received, the file is listed in the receiving program interface of the receiving terminal, and the file can be directly accessed at the receiving terminal.
The equipment is completely nationwide and has independent intellectual property rights. The visible light one-way transmission equipment adopts a domestic visible light chip, and the chip and the module matched with the visible light one-way transmission equipment are both domestic.
The equipment has the following functions:
(1) file delivery function
The check device supports unidirectional transmission of files, the files can comprise common office files such as Word, Excel, PPT, compressed packages and the like, and unidirectional transmission of files with different sizes is supported.
(2) Text messaging functionality
The verification device supports one-way transmission of text messages and maintains a history.
(3) Specified file retransmission function
The verification equipment has recording and reminding functions under the condition that the transmission file fails, and a user can personally select retransmission according to needs.
(4) Has log and report functions
The verification equipment has the function of recording user operation logs under the condition of being used, and has the function of alarming when errors occur in transmission.
(5) Local I/O device management functionality
The verification equipment has a local I/O equipment management function, and when the local I/O port is abnormal, the equipment stops working forcibly and records the working in a working log. Furthermore, the first boot device may have some I/O devices that may be disabled, and the PC software may check to see if disabled, and may control whether the I/O ports are disabled.
(6) Trojan checking and killing and patch repairing functions;
the verification equipment can be connected with some software (such as 360-degree security guards, Jinshan Powera and the like) for checking and killing Trojan and viruses, and can be networked to carry out operations such as 'virus update and killing' and 'system patch update' on the software, so that the intrusion of some viruses and Trojan is prevented, and the system is efficient and safe.
The performance indexes of the equipment are as follows:
the main performance indexes of the visible light unidirectional transmission equipment comprise: transmission rate: 1000 Mbit/s; bit error rate less than or equal to 10-12(ii) a The temperature of the working environment: -20 to 55 °; electromagnetic isolation: 3, grade; a data interface: 100M/1000M Ethernet port; reliability: MTBF (methyl tert-butyl ether)>80000h。
In order to verify the feasibility of the technical scheme, technical personnel perform test verification aiming at the function and performance indexes of the equipment.
The test environment should meet the following conditions: 1. ambient temperature: minus 20 ℃ to plus 55 ℃. 2. Relative humidity: 45 to 80 percent. 3. Atmospheric pressure: 86kPa to 106 kPa. 4. Indoor uniform light, no side light, direct light and no back light.
Verification of device functionality is first described.
First, a file sending function check is performed. The test process is as follows: the test environment was prepared according to the test conditions described above. The tester checks whether the equipment supports file unidirectional transmission, respectively tests common office files such as Word, Excel, PPT, compressed package and the like, and selects files of ten megabytes, hundred megabytes and gigabytes, and tests whether the equipment can transmit files of different sizes. And checking whether the result meets the requirement of the text sending function.
Second, a text messaging function check is performed. The test process is as follows: the test environment was prepared according to the test conditions described above. The tester tests the text message sending function of the equipment, detects whether the equipment has the message sending function through PC software, sends a large amount of messages and checks whether the equipment has a history record. It is checked whether the result meets the requirements of the text messaging function.
Then, a specified file retransmission function check is performed. The test process is as follows: the test environment was prepared according to the test conditions described above. The tester checks the history record transmitted by the equipment through PC software, and randomly appoints 5 files to retransmit new messages. And checking whether the result meets the requirement of the specified file retransmission function.
Then, log, reporting function checks are performed. The test process is as follows: the test environment was prepared according to the test conditions described above. After a large amount of transmissions are carried out through the PC software, a tester checks whether the PC software has the function of recording user operation logs or not, and tests whether the PC software has the alarm function or not when the transmission of the equipment is wrong. And checking whether the result meets the requirements of log and report functions.
Then, a local I/O device management function check is performed. The test process is as follows: the test environment was prepared according to the test conditions described above. The tester makes the equipment in working condition, inserts storage equipment on the computer of the first sending end respectively, checks whether the one-way transmission equipment of visible light stops working. The tester operates the PC software to see if the local I/O ports can be disabled or enabled. And checking whether the result meets the requirement of the management function of the local I/O equipment.
And then, Trojan checking and killing and patch repairing function inspection are performed. The test process is as follows: the test environment was prepared according to the test conditions described above. The tester checks whether the PC software has Trojan horse checking and killing and patch repairing functions, whether software for checking and killing Trojan horses and viruses can be connected, and the operation of 'updating and killing viruses' and 'updating system patches' is carried out on the software through networking. And checking whether the result meets the requirements of Trojan checking and killing and patch repairing functions.
Next, the performance index of the present apparatus is checked.
First, a transmission rate and bit error rate check is performed. The test process is as follows: the test environment was prepared according to the test conditions described above. A tester tests the single-channel transmission performance of the equipment and mainly performs the speed and waveform test of a physical layer baseband signal, the speed test of a sub-channel during self-crosstalk and the file transmission speed test of a file logistics roller. And checking whether the result meets the requirements of transmission rate and bit error rate.
Second, a working environment check is performed. The test process is as follows: the test environment was prepared according to the test conditions described above. The tester carries out the environmental suitability test, mainly includes following several aspects: 1) temperature test, 2) impact test, 3) vibration test, 4) damp heat test. And checking whether the result meets the requirements of the working environment.
Finally, an electromagnetic compatibility check is performed. The test process is as follows: the test environment was prepared according to the test conditions described above. The tester carries out the electromagnetic compatibility test, mainly includes following several aspects: 1) conducting emission test of a CE10125Hz-10KHz power line; 2) conducting emission test of a CE10210KHz-10MHz power line; 3) RE10125Hz-100KHz magnetic field radiation emission test; 4) RE10210KHz-18GHz electric field radiation emission test; 5) CS11410KHz-400MHz cable bundle injection conduction sensitivity test. And checking whether the result meets the requirement of electromagnetic compatibility.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (10)
1. A device for physically isolating unidirectional transmission of visible light communications, comprising: sending end equipment and receiving end equipment, sending end equipment includes: send special treatment board of send end VLC and VLC send the drive plate, and receiving end equipment includes: receiving end VLC special processing board and VLC receive equalizer plate, VLC send the drive plate to include a plurality of VLC send module, VLC receive equalizer plate includes a plurality of VLC receive module, VLC receive module and VLC send module correspond the setting, VLC send module will modulate good signal loading to LED on, will be loaded with the visible light of signal through LED and launch to corresponding VLC receive module in free space.
2. The physical isolation unidirectional transmission device for visible light communication of claim 1, wherein the sending end device is connected to the sending end computer through a GigaE internet access, and the receiving end device is connected to the receiving end computer through a GigaE internet access.
3. The device of claim 2, wherein the sending device communicates with the sending computer via ethernet frames and the receiving device communicates with the receiving computer via ethernet frames.
4. The device of claim 3, wherein the VLC special processing board at the transmitting end performs protocol conversion on received ethernet frames, and converts an original TCP protocol into a custom network protocol; then, the data after protocol conversion is processed by serial-parallel conversion, channel coding, line coding and M sequence addition; and finally transmitting the modulated data to a VLC sending module.
5. The device of claim 1, wherein the VLC sending module further drives and pre-equalizes the input data efficiently before loading the modulated signal onto the LED.
6. The device as claimed in claim 1, wherein the VLC receiving module receives the light waves loaded with signals, and after performing photoelectric conversion, multi-stage amplification and frequency domain equalization, restores the light signals into electrical signals to be transmitted to the VLC dedicated processing board at the receiving end.
7. The physical isolation unidirectional transmission device for visible light communication according to claim 3, wherein the VLC special processing board performs operations of removing M sequence, line decoding, channel decoding from the received data, performs protocol conversion on the demodulated signal, and restores the customized network protocol to the TCP protocol; and finally, the recovered Ethernet frame is sent to a receiving end computer through the GigaE gigabit network port.
8. The device of claim 1, wherein the device has a file sending function, a text message sending function, a designated file retransmission function, a log reporting function, a local IO device management function, a trojan killing function, and a patch repair function.
9. The apparatus of claim 1, wherein the data transmission rate of the apparatus is 1000 Mbit/s.
10. The isolated physical unidirectional transmission device of claim 1, wherein the bit error rate of the isolated physical unidirectional transmission device is not less than 10-12。
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| CN202010997683.8A CN112087261A (en) | 2020-09-21 | 2020-09-21 | Physical isolation one-way transmission equipment for visible light communication |
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| CN202010997683.8A CN112087261A (en) | 2020-09-21 | 2020-09-21 | Physical isolation one-way transmission equipment for visible light communication |
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| CN107070553A (en) * | 2017-04-18 | 2017-08-18 | 东莞信大融合创新研究院 | A kind of unidirectional transmission system and its method based on visible light communication |
| CN206542411U (en) * | 2017-03-17 | 2017-10-03 | 河南省中远科技有限公司 | A kind of one-way data transfer equipment based on VLC |
| CN206673968U (en) * | 2017-03-17 | 2017-11-24 | 河南省中远科技有限公司 | A kind of one-way safety transmitting device based on VLC |
| CN110838877A (en) * | 2019-11-15 | 2020-02-25 | 安徽中骄智能科技有限公司 | One-way data transmission equipment of visible light |
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2020
- 2020-09-21 CN CN202010997683.8A patent/CN112087261A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106788718A (en) * | 2017-03-17 | 2017-05-31 | 河南省中远科技有限公司 | A kind of one-way safety transmitting device, system and method based on VLC |
| CN206542411U (en) * | 2017-03-17 | 2017-10-03 | 河南省中远科技有限公司 | A kind of one-way data transfer equipment based on VLC |
| CN206673968U (en) * | 2017-03-17 | 2017-11-24 | 河南省中远科技有限公司 | A kind of one-way safety transmitting device based on VLC |
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Application publication date: 20201215 |