CN105049117A - Intelligent traffic system based on visible light communication - Google Patents
Intelligent traffic system based on visible light communication Download PDFInfo
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- CN105049117A CN105049117A CN201510389409.1A CN201510389409A CN105049117A CN 105049117 A CN105049117 A CN 105049117A CN 201510389409 A CN201510389409 A CN 201510389409A CN 105049117 A CN105049117 A CN 105049117A
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Abstract
An intelligent traffic system based on visible light communication is disclosed. The invention relates to an intelligent traffic system and aims to provides high network access, satisfies the market demands, and solve the problem that a conventional traffic system is highly expensive in network access, wireless Wi-Fi technique has safety risk on crosstalk control passband and is low in feasibility. The intelligent traffic system comprises a Wi-Fi base station which comprises fiber links, establishes connection between an accessing terminal and an Internet terminal, processes electric signals, and receives and/or sends electric signals; a street lamp which comprises a photoelectric communication apparatus, receives the electric signals of the Wi-Fi base station, converts the electric signals into optical signals and sends the optical signals; and an automobile which comprises a photoelectric communication apparatus, receives the optical signals of the street lamp and/or sends optical signals to the street lamp. The intelligent traffic system is applicable to high speed network access on roads.
Description
Technical field
The present invention relates to intelligent transportation system, be specifically related to a kind of intelligent transportation system based on visible ray communication.
Background technology
In existing traffic system, passenger has strong demand to internet access during the journey in sleepiness.In prior art, usually, passenger individual uses LTE technology to carry out internet access, and 2G access speed is low, and 3G/4G campus network is too expensive; Secondly, the mobile Wi-Fi shared network major part of public transport belongs to local area network (LAN), accesses limited, and has an impact to public transport communication, there is potential safety hazard; Finally, satellite communication technology civil nature imperfection, feasibility makes us querying.In sum, in existing traffic system, can not realize the networking of intelligent transportation well, passenger can not obtain express network and experience, and the market demand can not meet.So the present invention discloses a kind of intelligent transportation system providing express network to access.
Summary of the invention
For above-mentioned prior art, the object of the invention is to provide a kind of intelligent transportation system based on visible ray communication, it aims to provide express network access, meet the need of market, and solve access to netwoks somewhat expensive in existing traffic system, there is the potential safety hazard of crosstalk control passband and the low inferior problem of feasibility in wireless Wi-Fi technology.
For achieving the above object, the technical solution used in the present invention is as follows:
Based on an intelligent transportation system for visible ray communication, comprise Li-Fi base station: comprising optical fiber link, set up the connection of access end and the Internet end, the process signal of telecommunication, receive and/or send the signal of telecommunication; Street lamp: comprising photoelectric communication device, receives the signal of telecommunication of Li-Fi base station and is converted to light signal transmission; Automobile: comprising photoelectric communication device, receives the light signal of street lamp and/or sends light signal to street lamp; Street lamp receives the light signal that automobile sends, and transmitting photo-signal is that the signal of telecommunication is uploaded to Li-Fi base station.
In such scheme, described optical fiber link, comprises signal transmitting path and Signal reception path.
In such scheme, described signal transmitting path, comprises ASIC: at least export two signals of telecommunication, each electrical signal rate is at least greater than 1Gbps/s; Equalizer: connect ASIC by ultrahigh speed Ethernet interface, receives the signal of telecommunication; CDR & deserializer: receive the signal of telecommunication after equalizer compensation, carry out clock and data recovery and unstring; Phase compensator: the signal of telecommunication receiving CDR & deserializer, carries out phase-fitting between the dynamic and stalic state signal of telecommunication; Serializer: the signal of telecommunication after the matching of receiving phase compensator, exports serial electric signal; Postemphasis driver: the signal of telecommunication receiving serializer, carries out postemphasising and amplifieroperation, exports the signal of telecommunication; FPGA: connect the driver that postemphasises by physical medium associated layers interface.Equalizer can equivalent high pass filter, to high communication number loss balancing in transmitting procedure, increases signal fidelity; High-speed serial signals is converted to parallel signal by deserializer, and CDR carries out recovery to clock in signal and data and encodes; Postemphasis driver, uses the amplitude of postemphasis mode inhibit signal rising edge and falling edge constant, and other ground square signals weaken, and adjustment signal to noise ratio, increases signal fidelity; FPGA adds system versatility, reduces system cost.
In such scheme, described Signal reception path, comprises FPGA: receive the signal of telecommunication that street lamp is uploaded; Equalizer: receive the signal of telecommunication that FPGA sends equalizer in respective signal transmitting path; CDR: receive the signal of telecommunication after equalizer compensation, carry out clock and data recovery; Multiplexer: receive the signal of telecommunication after CDR recovers, export at least two Half Speed signals of telecommunication; Postemphasis driver: the Half Speed signal of telecommunication receiving multiplexer, carries out postemphasising and amplifieroperation; ASIC: connect the driver that postemphasises by ultrahigh speed Ethernet interface, at least receives two Half Speed signals of telecommunication.Multiplexer makes full use of the capacity of communication channel, greatly reduces the cost of system.
In such scheme, described photoelectric communication device, comprises LED driver: connect Li-Fi base station by transfer bus, exports control signal; LED: the control signal receiving LED driver, sends light signal according to signal of telecommunication particular sequence pattern; PIN photodiode: receiving optical signals, is converted to the signal of telecommunication; Trans-impedance amplifier: connect Li-Fi base station by transfer bus, receives the signal of telecommunication of PIN photodiode, exports Li-Fi base station to.Described trans-impedance amplifier, comprises cross-linked first pair of differential input transistor and second pair of differential input transistor.Realize the input and output of high frequency Fidelity signal, have more wide bandwidth and be not subject to control, trans-impedance amplifier structure is comparatively simple, and lower cost, can be mass and be installed in road street lamp.
In such scheme, described photoelectric communication device and Li-Fi base station, in optical communication process, use IEEE802.15.7 protocol definition physical layer and medium access control layer.Use in agreement " 0 " and " 1 " that Synchronization realizes in data.
In such scheme, described automobile, also comprise the processor connecting photoelectric communication device, processor is connected with Wi-Fi device.There is for existing mobile terminal device the technology status of Wi-Fi function mostly, and then complete prior art docking, and increase system universality.
In such scheme, described LED driver, comprises monostable trigger unit.Can energy savings when not using LED communication.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is trans-impedance amplifier circuit diagram in the present invention;
Fig. 3 is Signal reception sampling schematic diagram in the present invention;
In figure: 1a_EQ, 1b_EQ-equalizer, 2_CDR & SER.-clock and data recovery and deserializer, 3_DSW-phase compensator, the serializer of 4_20Gbps & SER.-20Gbps speed, 5_DE. & Drive, 9_DE. & Drive-postemphasises driver, 6_FPGA-field programmable gate array, 7_CDR-clock and data recovery, 8_MUX-multiplexer, 10-photoelectric communication device, 11_LEDDR.-LED drive, 12_TIA-trans-impedance amplifier, 13_LED-light-emitting diode, 14_PIND.-photodiode, 15_WiFi-wireless universal fidelity device, 16_CPU-central processing unit, 17_ASIC-application-specific integrated circuit (ASIC), Zpd-impedance, Vpd-impedance voltage, VDD-power supply, Q1, Q2, Q3, Q4-triode.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Below in conjunction with accompanying drawing, the present invention will be further described:
Fig. 1 is structural representation of the present invention, and a kind of intelligent transportation system based on visible ray communication, comprises Li-Fi base station 100: comprising optical fiber link, sets up the connection of access end and the Internet end, the process signal of telecommunication, receives and/or sends the signal of telecommunication; Street lamp 200: comprising photoelectric communication device 10, receives the signal of telecommunication of Li-Fi base station 100 and is converted to light signal transmission; Automobile 300: comprising photoelectric communication device 10, receives the light signal of street lamp 200 and/or sends light signal to street lamp 200; Street lamp 200 receives the light signal that automobile 300 sends, and transmitting photo-signal is that the signal of telecommunication is uploaded to Li-Fi base station 100.
Fig. 2 is trans-impedance amplifier circuit diagram in the present invention, described trans-impedance amplifier 12, comprises cross-linked first couple of differential input transistor Q1, Q2 and second couple of differential input transistor Q3, Q4; Each transistor base is connected with electric capacity, grounded emitter; Cross-coupled manner can under high frequency input, effectively reduce input signal response modes because of impedance Z pd1, impedance Z pd2 cause feature weaken effect; Resistance R3 and resistance R4 can provide dot peak detection and increase bandwidth.
Embodiment 1
Fig. 3 is Signal reception sampling schematic diagram in the present invention, and LED 13 sends packet, and photodiode 14 completes clock synchronous by connecting FPGA6 across sufficient amplifier 12, ensures the time accuracy that sampling occurs; LED driver 11 arranges the light period of LED13 in advance, keeps and the photodiode 14 same cycle, sends single data delay and be no more than 3ms in one-period.In receiving course, when 1/4, LED13 of the leading LED13 light period of photodiode 14 clock sends logical zero (lower optical densities), photodiode 14 starts to sample 1; When LED13 sends logical one (high light intensity), photodiode 14 starts to sample 2, FPGA6 and compares two samplings.
Embodiment 2
In Fig. 3, the curve of photodiode PIN.D3, it is equal that photodiode PIN.D3 samples 1,2 energy, and LED13 and photodiode PIN.D3 clock phase exceed two sampling periods, occur that this kind of situation may be because ambient light is too weak, cause receiving optical density too low.Therefore, communication algorithm should comprise, and in two sampled signals, at least ensureing one is be detected as logical one.Such as, if sampled signal 1,2 does not exceed the threshold value determined, FPGA6 identifies that 2 cycles closed by clock, and row clock of going forward side by side adjusts; If after the adjustment, sampled signal 1,2 does not still exceed threshold value, be then judged to be do not have light source input sync signal pattern at present.
Embodiment 3
LED13 lamp choosing wavelength is interval at 850nm, 1310nm, 1490nm, CW-DM, 1550nm, DWDM; The mode of enabling is photoinduction startup, passive light startup, the selection of optoacoustic control combination technology, the mechanically integrated module of photoinduction and/or alternatives.
Embodiment 4
LED driver 11 is applicable to following MCU, DSP, CPU or GPU, the RISC framework of APU, ARM or x86 framework, quantum or the photon CPU choice of technology.There is technological incorporation in the technical development making a general survey of microprocessor: optical communication chip, and the invention of Graphene chip makes network Development hardware occur unknown mutation, and the progress of technology is the reference of selection standard.But for changing bad invention, or cost viewpoint, only from the selection of technical scheme of practicality.
Beneficial effect of the present invention: realize access to netwoks easily in transport process, meet the need of market, provide light communication system with low cost, expands communication bandwidth, has higher stability, fail safe and versatility.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly belongs to those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (8)
1. based on an intelligent transportation system for visible ray communication, it is characterized in that, comprise
Li-Fi base station (100): comprising optical fiber link, sets up the connection of access end and the Internet end, the process signal of telecommunication, receives and/or sends the signal of telecommunication;
Street lamp (200): comprising photoelectric communication device (10), receives the signal of telecommunication of Li-Fi base station (100) and is converted to light signal transmission;
Automobile (300): comprising photoelectric communication device (10), receives the light signal of street lamp (200) and/or sends light signal to street lamp (200);
Street lamp (200) receives the light signal that automobile (300) sends, and transmitting photo-signal is the signal of telecommunication and is uploaded to Li-Fi base station (100).
2. a kind of intelligent transportation system based on visible ray communication according to claim 1, is characterized in that, described optical fiber link, comprises signal transmitting path and Signal reception path.
3. a kind of intelligent transportation system based on visible ray communication according to claim 2, is characterized in that, described signal transmitting path, comprises
ASIC(17): at least export two signals of telecommunication, each electrical signal rate is at least greater than 1Gbps/s;
Equalizer (1a): connect ASIC(17 by ultrahigh speed Ethernet interface XLAUI), receive the signal of telecommunication;
CDR & deserializer (2): receive the signal of telecommunication after equalizer (1a) compensation, carry out clock and data recovery and unstring;
Phase compensator (3): the signal of telecommunication receiving CDR & deserializer (2), carries out phase-fitting between the dynamic and stalic state signal of telecommunication;
Serializer (4): the signal of telecommunication after receiving phase compensator (3) matching, exports serial electric signal;
Postemphasis driver (5): the signal of telecommunication receiving serializer (4), carries out postemphasising and amplifieroperation, exports the signal of telecommunication;
FPGA(6): connect by physical medium associated layers interface PMD the driver (5) that postemphasises.
4. a kind of intelligent transportation system based on visible ray communication according to claim 2, is characterized in that, described Signal reception path, comprises
FPGA(6): receive the signal of telecommunication that street lamp (200) is uploaded;
Equalizer (1b): receive the signal of telecommunication that FPGA sends equalizer (1a) in respective signal transmitting path;
CDR(7): receive the signal of telecommunication after equalizer (1b) compensation, carry out clock and data recovery;
Multiplexer (8): receive through CDR(7) recover after the signal of telecommunication, export at least two Half Speed signals of telecommunication;
Postemphasis driver (9): the Half Speed signal of telecommunication receiving multiplexer (8), carries out postemphasising and amplifieroperation;
ASIC(17): connect by ultrahigh speed Ethernet interface XLAUI the driver (9) that postemphasises, at least two Half Speed signals of telecommunication are received.
5. a kind of intelligent transportation system based on visible ray communication according to claim 1, is characterized in that, described photoelectric communication device (10), comprises
LED driver (11): connect Li-Fi base station (100) by transfer bus, exports control signal;
LED (13): the control signal receiving LED driver (11), sends light signal according to signal of telecommunication particular sequence pattern;
PIN photodiode (14): receiving optical signals, is converted to the signal of telecommunication;
Trans-impedance amplifier (12): connect Li-Fi base station (100) by transfer bus, receives the signal of telecommunication of PIN photodiode (14), exports Li-Fi base station (100) to.
6. a kind of intelligent transportation system based on visible ray communication according to claim 5, it is characterized in that, described trans-impedance amplifier (12), comprises cross-linked first pair of differential input transistor (Q1, Q2) and second pair of differential input transistor (Q3, Q4).
7. a kind of intelligent transportation system based on visible ray communication according to claim 1, it is characterized in that, described photoelectric communication device (10) and Li-Fi base station (100), in optical communication process, use IEEE802.15.7 protocol definition physical layer and medium access control layer.
8. a kind of intelligent transportation system based on visible ray communication according to claim 1, it is characterized in that, described automobile (300), also comprise the processor (16) connecting photoelectric communication device (10), processor (16) is connected with Wi-Fi(15) device.
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Cited By (11)
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| CN106060141A (en) * | 2016-06-16 | 2016-10-26 | 泉州鑫彩贸易有限公司 | City road lamp management system based on LiFi (Light Fidelity) technology |
| CN107889075A (en) * | 2017-10-23 | 2018-04-06 | 林楚莲 | A kind of information of vehicles Transmission system based on Li Fi technologies |
| CN108494483A (en) * | 2018-03-20 | 2018-09-04 | 东南大学 | A kind of highway light wireless communication method |
| CN108521297A (en) * | 2018-04-26 | 2018-09-11 | 杨春花 | A kind of point-to-point wireless communication module based on LI-Fi |
| CN106230505B (en) * | 2016-07-19 | 2018-11-13 | 中国科学技术大学 | Optimal input distribution acquiring method in a kind of intelligent transportation system based on visible light communication |
| CN108833011A (en) * | 2018-04-26 | 2018-11-16 | 苏州大贝岩电子科技有限公司 | A kind of communication control system based on LI-Fi communications protocol |
| CN108880677A (en) * | 2018-04-26 | 2018-11-23 | 卢思雨 | A kind of long range intelligent transportation system aggravated based on data |
| CN108880676A (en) * | 2018-04-26 | 2018-11-23 | 苏州灵亿易电子科技有限公司 | A kind of communication system based on FPGA and ASIC |
| CN108881870A (en) * | 2018-04-26 | 2018-11-23 | 肖剑 | A kind of intelligent transportation system based on optical communication |
| CN108880678A (en) * | 2018-04-26 | 2018-11-23 | 高路生 | A kind of intelligent transportation system based on the covering of platform formula |
| CN111987784A (en) * | 2018-04-26 | 2020-11-24 | 肖剑 | Stereo garage system based on bluetooth equipment and LI-Fi wireless transmission |
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| CN106060141A (en) * | 2016-06-16 | 2016-10-26 | 泉州鑫彩贸易有限公司 | City road lamp management system based on LiFi (Light Fidelity) technology |
| CN106230505B (en) * | 2016-07-19 | 2018-11-13 | 中国科学技术大学 | Optimal input distribution acquiring method in a kind of intelligent transportation system based on visible light communication |
| CN107889075A (en) * | 2017-10-23 | 2018-04-06 | 林楚莲 | A kind of information of vehicles Transmission system based on Li Fi technologies |
| CN108494483A (en) * | 2018-03-20 | 2018-09-04 | 东南大学 | A kind of highway light wireless communication method |
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| CN108881870A (en) * | 2018-04-26 | 2018-11-23 | 肖剑 | A kind of intelligent transportation system based on optical communication |
| CN108880678A (en) * | 2018-04-26 | 2018-11-23 | 高路生 | A kind of intelligent transportation system based on the covering of platform formula |
| CN111987784A (en) * | 2018-04-26 | 2020-11-24 | 肖剑 | Stereo garage system based on bluetooth equipment and LI-Fi wireless transmission |
| CN108521297A (en) * | 2018-04-26 | 2018-09-11 | 杨春花 | A kind of point-to-point wireless communication module based on LI-Fi |
| CN111987784B (en) * | 2018-04-26 | 2021-12-10 | 高燕妮 | Stereo garage system based on bluetooth equipment and LI-Fi wireless transmission |
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