CN108092718A - Visible soft exchange network communication system based on high-power illumination LED light - Google Patents
Visible soft exchange network communication system based on high-power illumination LED light Download PDFInfo
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- 238000005286 illumination Methods 0.000 title claims abstract description 56
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2854—Wide area networks, e.g. public data networks
- H04L12/2856—Access arrangements, e.g. Internet access
- H04L12/2869—Operational details of access network equipments
- H04L12/2878—Access multiplexer, e.g. DSLAM
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/44—Star or tree networks
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Abstract
The invention discloses a kind of visible soft exchange network communication systems based on high-power illumination LED light, it includes two visible light communication system units, it is access end adapter and pci client adapter PCI respectively, convenient, flexible can be realized using them and network-termination device is passed through into visible ray wireless connection Ethernet.The present invention utilizes existing illumination LED device and Ethernet facility, realize the visible ray wireless access network based on high-power LED illuminating lamp, illumination can be provided simultaneously to communicate with network insertion, there is easy to implement, simple structure, compared with Radio-Frequency Wireless Communication it is also energy-efficient, without the good advantage of electromagnetic interference, security.
Description
Technical field
It is particularly a kind of to be based on high-power photograph the present invention relates to technical field of visible light communication and wireless communication field
The visible soft exchange network communication system of bright LED light.
Background technology
Due to the sharp increase of wireless network traffic in Internet era, new challenge is proposed to wireless communication capacity,
And the Radio Spectrum Resource of radio communication is at full stretch, it is increasingly rare.A kind of mode of the visible ray as wireless communication, possesses
Huge frequency spectrum resource, and with the development of LED illumination industry, the improved efficiency of LED, price reduction, LED are becoming illumination
The main force.So carrying out visible light communication reply wireless flow demand using illumination LED becomes a feasible selection.
Meanwhile the essence that LED visible light communication is carried out data transmission using visible ray causes it to exist compared to radio communication
Electromagnetic interference and user's secure context have natural advantage, this can be used for for the higher place of electromagnetic requirements
(such as hospital, aircraft).And in terms of networking, it is seen that LED light communication can directly using LED illumination lamp as base station, compared to
For radio communication and infrared communication, the additional cost for establishing base station and wiring is eliminated, in the place for having LED illumination
LED visible light communication net is established, this causes LED visible light communication has can be by the basis of broad development.
On the other hand, Ethernet has become the most widely used standard of current LAN, the infrastructure of Ethernet
It is commonplace and perfect.Network equipment access network based on ethernet is realized using LED visible light communication system, realizes the network equipment
Wireless Internet function can both alleviate the frequency spectrum resource anxiety problem of Radio-Frequency Wireless Communication, can also make full use of Ethernet
Existing utility provides a kind of convenient, high speed and the extensive communication means in application scenario.
Therefore, it is necessary to a kind of systems that can utilize abundant existing Ethernet facility and lighting installation, it can not only be realized
Visible light communication, and can be it will be seen that optical communication system and Ethernet system efficiently connect, realization wired ethernet signal is via photograph
Bright transmission of visible light realizes reliable free-space optics access of the network equipment to Ethernet.
The content of the invention
The technical problem to be solved in the present invention：Visible light communication system is built using illumination LED, and realizes visible light communication
System is merged with existing Ethernet system, realizes the wireless optical networking of the network equipment.
The present invention solves its technical problem and uses following technical solution：
Visible soft exchange network communication system provided by the invention based on high-power illumination LED light, including two visible rays
Communication system units, are access end adapter and pci client adapter PCI respectively, are easily realized network-termination device using them
Pass through visible ray wireless connection Ethernet.
The access end adapter, including with the sequentially connected ethernet interface circuit of electric signal, encoding downlink signals
Module, downlink signal modulation module, downlink LED illumination and signal of communication drive module, downlink illumination LED and with electric signal
Sequentially connected uplink photoelectric signal transforming module, digital uplink signal recovery module, uplink signal demodulation module, uplink signal
Decoder module, multiple access AM access module.
Above-mentioned access end adapter, wherein：
The downlink signal modulation module and uplink signal modulation module carry out base band tune to the network signal after coding
System, including symbol mapping, OFDM modulation and D/A conversions；
The downlink signal demodulation module and uplink signal demodulation module, to the letter by visible light communication system transmission
Number carry out base band demodulating, including synchronization, IQ demodulation, channel equalization, demapping operate；
The encoding downlink signals module and uplink signal coding module scramble network signal, add leading sequence
Row, channel code and interleaving encoding operation；
The downlink signal decoder module and uplink signal decoder module, to after visible light communication system transmits
Network signal carries out descrambling code, goes targeting sequencing, channel decoding and deinterleave operation, to extract MAC layer network signal.
Above-mentioned access end adapter, wherein：
The downlink LED illumination and signal of communication drive module and uplink LED communication signal driver module are inclined with direct current
Circuits and ac signal circuit are core, and data-signal in a manner of AC modulation is loaded into LED, has both realized the illumination of LED
Function, and data-signal is loaded on illuminating LED lamp, and maximally utilised the physics modulation band of great power LED
It is wide；
The downstream digital signal recovery module and digital uplink signal recovery module are respectively to downlink PD and uplink PD
The ultra-weak electronic signal detected is amplified, filters, A/D is converted, judgement recovers digital electric signal；Downlink photoelectric conversion module
In uplink photoelectric conversion module, row photodetectors (PD) and uplink PD are respectively equipped with, before wherein downlink PD and uplink PD
The filter plate of different colours is equipped with, and the filter plate before each uplink PD leaves effective bandwidth granularity, avoids downlink chain
Between road and uplink, interference is generated between uplink and uplink, realizes the wavelength-division multiplex of visible light communication, so as to
It realizes and can access more multi-client in visible LED spectral region.
The pci client adapter PCI, including with the sequentially connected equipment interface of electric signal, downlink signal decoder module, under
Row signal demodulation module, downstream digital signal recovery module, downlink photoelectric conversion module and with electric signal it is sequentially connected on
Row LED communication signal driver module, uplink signal modulation module, uplink signal coding module.
Above-mentioned pci client adapter PCI, wherein：
The downlink signal modulation module and uplink signal modulation module carry out base band tune to the network signal after coding
System, including symbol mapping, OFDM modulation and D/A conversions；
The downlink signal demodulation module and uplink signal demodulation module, to the letter by visible light communication system transmission
Number carry out base band demodulating, including synchronization, IQ demodulation, channel equalization, demapping operate；
Network signal is scrambled the encoding downlink signals module and uplink signal coding module plus leading sequence
Row, channel code and interleaving encoding operation；
The downlink signal decoder module and uplink signal decoder module, to after visible light communication system transmits
Network signal carries out descrambling code, goes targeting sequencing, channel decoding and deinterleave operation, to extract MAC layer network signal.
Above-mentioned pci client adapter PCI, wherein：
The downlink LED illumination and signal of communication drive module and uplink LED communication signal driver module are inclined with direct current
Circuits and ac signal circuit are core, and data-signal in a manner of AC modulation is loaded into LED, has both realized the illumination of LED
Function, and data-signal is loaded on illuminating LED lamp, and maximally utilised the physics modulation band of great power LED
It is wide；
The downstream digital signal recovery module and digital uplink signal recovery module are respectively to downlink PD and uplink PD
The ultra-weak electronic signal of conversion is amplified, filters, A/D is converted, judgement recovers digital electric signal；
In the downlink photoelectric conversion module and uplink photoelectric conversion module, row photodetectors (PD) are respectively equipped with
With the filter plate that different colours are equipped with before uplink PD, wherein downlink PD and uplink PD, and the filter plate before each uplink PD
Effective bandwidth granularity is left, avoids between downlink and uplink, interference is generated between uplink and uplink,
The wavelength-division multiplex of visible light communication is realized, so as to fulfill can access more multi-client in visible LED spectral region.
The visible soft exchange network communication system of the present invention, wherein：The network signal of ethernet interface circuit output enters downlink
Signal coding module, network signal is scrambled Signal coding module plus targeting sequencing, channel code and interleaving coding behaviour
Make；Encoded output signal enters downlink signal modulation module, and symbol mapping, OFDM modulation and D/ are carried out in signal modulation module
A is converted, and the baseband modulation signal of signal modulation module output enters downlink LED illumination and signal of communication drive module；Downlink LED
Modulated network signal and DC bias signal are loaded on downlink LED by illumination and signal of communication drive module together, LED
Send the illumination light with the communication information；The optical signal of uplink carries out opto-electronic conversion at uplink PD；The simulation electricity of output
Signal enters digital uplink signal recovery module, be amplified, filter in digital signal recovery module, A/D conversion and judgement,
Export the digital electric signal recovered；The digital electric signal for recovering to rule out enters uplink signal demodulation module, is demodulated in signal
Digital electric signal is synchronized in module, IQ demodulation, channel equalization, demapping operation；Demodulated output signal enters uplink letter
Number decoder module carries out descrambling code in signal decoder module, goes targeting sequencing, channel decoding and deinterleave operation；It decodes defeated
Go out signal and enter multiple access AM access module, multiple access AM access module controls decoded output signal to enter Ethernet by time-division multiplexing method
Interface circuit carries out rate adaptation and formal argument in ethernet interface circuit, recovers MAC layer network signal and be input to ether
In net.
Visible soft exchange network communication system provided by the invention, is used for multiple access mode, using time-division and wavelength-division
Hybrid multiplex technology realizes the visible ray multiple access network of express network.
Present system is in application, can connect Ethernet, access end adapter, pci client adapter PCI with the network equipment
Get up, realize multiple network equipments while be wirelessly linked by visible ray in Ethernet；The system can profit
With existing illumination LED device and Ethernet facility, have the characteristics that enforcement difficulty is low, simple structure, lead to compared with wireless radiofrequency
Letter also whether there is the good advantage of electromagnetic interference, security.
The present invention has the advantages that following main compared with prior art：
1. providing a kind of method outside wireless radiofrequency access for network equipment access network based on ethernet, both take full advantage of existing
There is illumination LED, ensure to realize wireless optical networking while illuminating effect, the electromagnetic interference in wireless radiofrequency will not be generated, be
The special occasions such as aircraft, hospital realize a kind of practicable method of wireless communication.
2. access end adapter only needs to connect a cable, it can support the wireless access of multiple equipment, eliminate
Multi-user passes through the required complicated connection of wiring logging-on function.By the present invention program, actual verification accesses four tunnel terminals and sets simultaneously
It is standby, with 5 watts of illuminating LED lamps, in 5 meters of distances, the network synthesises such as HD video program request, file transmission, web page browsing can be completed
Business.
3. pci client adapter PCI can move, meets the needs of user's mobile Internet access, while the equipment of pci client adapter PCI
Interface circuit can carry out different customizations according to the difference of equipment interface, and the equipment of various interfaces is allowed to use the system.
4. access end adapter and pci client adapter PCI all realize the integration of transceiver module, full-duplex communication is supported.
Description of the drawings
Fig. 1 is the overall structure of the embodiment of the present invention and system composition schematic diagram.
Fig. 2 is the embodiment schematic diagram for the ethernet interface circuit that end adapter is accessed in the present invention.
Fig. 3 is Signal coding inside modules structure diagram in the present invention.
Fig. 4 is signal modulation module internal structure schematic diagram in the present invention.
Fig. 5 is drive module internal structure schematic diagram in the present invention.
Fig. 6 is digital signal recovery module internal structure schematic diagram in the present invention.
Fig. 7 is signal demodulation module internal structure schematic diagram in the present invention.
Fig. 8 is signal decoder module internal structure schematic diagram in the present invention.
Fig. 9 is uplink and downlink optical link wavelength-division multiplex multiple access schematic diagram.
Specific embodiment
The invention discloses a kind of visible soft exchange network communication system based on high-power illumination LED light, including with
The too visible light communication system unit-access end adapter and pci client adapter PCI of net system connection.Access end adapter passes through
Twisted-pair feeder is connected with Ethernet.Pci client adapter PCI moves, and is connected by equipment interface with network-termination device.Incoming end and
Pass through visible ray wireless link circuitry between pci client adapter PCI.Access end adapter only needs to connect a cable, can
Support the free-space optics access of multiple network-termination devices being connected on pci client adapter PCI.The equipment interface of pci client adapter PCI
Circuit can carry out different customizations according to the difference of equipment interface, and the equipment of various interfaces is allowed to use the system.
The present invention utilizes existing illumination LED device and Ethernet facility, realizes the visible ray based on high-power LED illuminating lamp
Wireless access network can provide illumination simultaneously and communicate with network insertion, have the characteristics that easy to implement, simple structure, compared with penetrating
Frequency wireless communication is also energy-efficient, without the good advantage of electromagnetic interference, security.
With reference to embodiment and attached drawing, the invention will be further described, but does not limit the present invention.
Visible soft exchange network communication system provided by the invention based on high-power illumination LED light, structure such as Fig. 1 institutes
Show：Major part is two visible light communication system units, that is, accesses end adapter and pci client adapter PCI.It is fitted using incoming end
Orchestration and pci client adapter PCI can be realized easily passes through visible ray wireless connection Ethernet by network-termination device.
The access end adapter, including with the sequentially connected ethernet interface circuit of electric signal, encoding downlink signals mould
Block, downlink signal modulation module, downlink LED illumination and signal of communication drive module, downlink illumination LED and with electric signal according to
The uplink photoelectric signal transforming module of secondary connection, digital uplink signal recovery module, uplink signal demodulation module, uplink signal solution
Code module, multiple access AM access module.
The pci client adapter PCI, including with the sequentially connected equipment interface of electric signal, downlink signal decoder module, downlink
Signal demodulation module, downstream digital signal recovery module, downlink photoelectric conversion module and with the sequentially connected uplink of electric signal
LED communication signal driver module, uplink signal modulation module, uplink signal coding module.
In above-mentioned Unit two, downlink signal modulation module and uplink signal modulation module to the network signal after coding into
Row baseband modulation, including symbol mapping, OFDM modulation and D/A conversions.Downlink signal demodulation module and uplink signal demodulation module
Base band demodulating is carried out to the signal by visible light communication system transmission, including synchronization, IQ demodulation, channel equalization, demapping behaviour
Make.
In above-mentioned Unit two, encoding downlink signals module and uplink signal coding module scramble network signal,
Add targeting sequencing, channel code and interleaving encoding operation, downlink signal decoder module and uplink signal decoder module can to passing through
The network signal seen after optical communication system transmission carries out descrambling code, goes targeting sequencing, channel decoding and deinterleave operation, with extraction
Go out MAC layer network signal.
In above-mentioned Unit two, downlink LED illumination and signal of communication drive module and uplink LED communication signal driver module
Using DC bias circuit and ac signal circuit as core, data-signal in a manner of AC modulation is loaded into LED, was both realized
The illumination functions of LED, and data-signal is loaded on illuminating LED lamp, and maximally utilised the object of great power LED
Manage modulation bandwidth.Its downstream digital signal recovery module and digital uplink signal recovery module respectively visit downlink PD and uplink PD
The ultra-weak electronic signal measured is amplified, filters, A/D is converted, judgement recovers digital electric signal.
In above-mentioned Unit two, in downlink photoelectric conversion module and uplink photoelectric conversion module, downlink PD and upper is respectively equipped with
Row PD.The filter plate of different colours is equipped with before wherein downlink PD and uplink PD, and the filter plate before each uplink PD has left
The bandwidth granularity of effect avoids between downlink and uplink, interference is generated between uplink and uplink, and realization can
The wavelength-division multiplex of optic communication is seen, so as to fulfill can access more multi-client in visible LED spectral region.
Downlink illumination LED uses white-light illuminating great power LED in the access end adapter, also serves as illumination and communication is made
With.Uplink LED was both dry between anti-stop signal using the LED of different spectrum by wavelength-division multiplex requirement in the pci client adapter PCI
It disturbs, and ensures more client terminal accesses.It realizes multiple network equipment terminal access Ethernet, is on the one hand to use in the downlink
The data of all users are broadcast to all clients adapter by the broadcast mode of Statistical Time Division Multiplexing by downlink illumination LED；
On the other hand it is in the uplink, using time division multiplexing and wavelength-division multiplex hybrid multiplex technology, i.e., each network equipment terminal
It is connected using different time-gap and different wave length with access end adapter.
In the access end adapter, the ethernet signal of downlink transfer carries out network MAC layer in ethernet interface circuit
The extraction of signal and rate adaptation, as shown in Figure 2.
The network signal of ethernet interface circuit output enters encoding downlink signals module, and Signal coding module believes network
It number is scrambled plus targeting sequencing, channel code and interleaving encoding operation, as shown in Figure 3.Encoded output signal enters downlink letter
Number modulation module carries out symbol mapping, OFDM modulation and D/A conversions in signal modulation module, signal modulation module output
Baseband modulation signal enters downlink LED illumination and signal of communication drive module, as shown in Figure 4.Downlink LED illumination and signal of communication
Modulated network signal and DC bias signal are loaded on downlink LED by drive module together, and LED is sent with communication letter
The illumination light of breath.The optical signal of uplink carries out opto-electronic conversion at uplink PD, as shown in Figure 5.The analog electrical signal of output
Into digital uplink signal recovery module, it is amplified, filters in digital signal recovery module, A/D is converted and judgement, output
The digital electric signal recovered, as shown in Figure 6.The digital electric signal for recovering to rule out enters uplink signal demodulation module, is believing
Digital electric signal is synchronized in number demodulation module, IQ demodulation, channel equalization, demapping operation, as shown in Figure 7.It demodulates defeated
Go out signal and enter uplink signal decoder module, descrambling code is carried out in signal decoder module, goes targeting sequencing, channel decoding reconciliation
Interweave operation, as shown in Figure 8.Decoded output signal enters multiple access AM access module, and multiple access AM access module passes through time-division multiplexing method
Control decoded output signal enters ethernet interface circuit, and rate adaptation and formal argument are carried out in ethernet interface circuit, extensive
MAC layer of appearing again network signal is input in Ethernet.
In pci client adapter PCI, the optical signal of downlink transfer carries out opto-electronic conversion at downlink PD and obtains analog electrical signal,
Downstream digital signal recovery module is input to, is amplified, filters in digital signal recovery module as shown in Figure 6, A/D turns
It changes and adjudicates, the digital electric signal of output enters downstream modulation module, to digital electric signal in demodulation module as shown in Figure 7
Synchronize, IQ demodulation, channel equalization, demapping operation, the digital signal demodulated enters downlink signal decoder module,
Descrambling code is carried out in decoder module as shown in Figure 8, targeting sequencing, channel decoding is gone and deinterleaves operation.After decoding
The network signal arrived carries out signal form conversion and rate adaptation in equipment interface circuit, is entered by standard device interface
The network equipment completes the transmission of downlink.Up direction, the network equipment input network signal, warp by standard device interface
After crossing the conversion of rate and form of equipment interface circuit, into uplink signal coding module, in Signal coding as shown in Figure 3
Module scrambles network signal plus targeting sequencing, channel code and interleaving encoding operation, encodes the signal of output into upper
Row signal modulation module.Symbol mapping, OFDM modulation and D/A conversions are carried out in signal modulation module as shown in Figure 4.Such as figure
Drive module shown in 5 provides DC bias signal and modulation output signal, is loaded on uplink LED, uplink LED, which is sent, to be carried
The visible ray of signal of communication.
Multiple access mode in uplink optical link using wavelength-division multiplex technique, realizes visible ray multiple access network.
As shown in Figure 9.
The present invention connects Ethernet, access end adapter, pci client adapter PCI and the network equipment, realizes multiple
The network equipment is wirelessly linked into Ethernet simultaneously by visible ray.The system can utilize existing illumination LED to fill
Put with Ethernet facility, have the characteristics that enforcement difficulty is low, simple structure, electromagnetism also whether there is compared with Radio-Frequency Wireless Communication and is done
It disturbs, the advantage that security is good.
The visible ray access point, network communication system that the present invention develops, data transfer bandwidth 100Mbps, communication distance reach 5
Meter or more, single base station communication coverage receiving terminal reaches practical implementation requirement, complex art up to 5 square metres or more
Performance indicator is in a leading position in homogeneous system.
Visible soft exchange network communication system provided by the invention based on high-power illumination LED light, the course of work are as follows：
It can be seen that the realization process of light wireless communication is, on down direction, the access end adapter that is connected with Ethernet will be with
Too net signal carries out rate adaptation and form conversion process, and network signal is enable effectively to be modulated in downlink LED light, and can be
Transmitting is realized in visible light communication system.Network signal after visible light communication system transmits, by client orchestration
Downlink optical detector (PD) detect and carry out opto-electronic conversion, hence into client orchestration.Client orchestration is to receiving
Network signal recovered, adjudicated, being demodulated, decoded after, signal form conversion and rate adaptation are carried out, to meet heterogeneous networks
The requirement of equipment interface signal transmission, finally enters the network terminal by network device interface, completes the transmission of downlink signal.
Downlink is using broadcast mode, and multiple equipment shares a downlink, and each equipment is for downlink chain
The cut-in method on road is Statistical Time Division Multiplexing.Each equipment can all receive all broadcast singals, according to the broadcast received
Destination address information in signal determines whether to receive the broadcast singal.More one downlink of collaborative share, simplify down
Line link is built, and avoids the interference between multiple downlink.The downlink LED of downlink using white-light illuminating LED,
Visible light communication is carried out while realizing and illuminating.Be equipped with blue light filter before the downlink PD of downlink, with prevent by
To the interference of uplink optical signal.
On up direction, the client orchestration that is connected with the network equipment, the network signal that equipment is sent carries out signal shape
The conversion of formula and rate adaptation so that network signal removes modulation uplink LED with the optimised form of suitable LED physical characteristics, and real
Transmitting in present illumination LED visible light communication system.The uplink optical detector (PD) of incoming end orchestration is to what is received
Uplink visible ray carries out opto-electronic conversion and obtains electric signal, and electric signal is by the recovery of incoming end adaptation unit, judgement, demodulation, solution
Active block signal is obtained after the operations such as code, finally by signal form conversion and rate adaptation, in the control of multiple access AM access module
System is lower to return to Ethernet by Ethernet interface, completes the transmission of uplink signal.
For uplink using star network topology, each network equipment accesses an incoming end by optical link jointly
Adapter.Each road uplink signal enters Ethernet interface electricity under the control of multiple access AM access module, using time-multiplexed method
Road obtains the access right of up channel.Uplink LED uses the LED of different color light, and corresponding color is equipped with before uplink PD
Filter plate, that realizes each uplink optical link does not interfere with each other transmission.
Visible soft exchange network communication system provided by the invention based on high-power illumination LED light, has the characteristics that：
1. on the basis of high-power LED illuminating lamp, merged network insertion communication function, at the same realize illumination with can
See optical communication capabilities, and communication system make use of mains lighting supply, save the energy, realizes green illumination and communicates with environmental protection.
2. on visible light communication system, using time-division and wavelength-division hybrid multiplex technology, the mostly objective of express network is realized
Family terminal access, has effectively expanded the spectrum utilization factor of great power LED, on modulation bandwidth limited high-power illumination LED,
The availability of frequency spectrum is improved, simplifies system, reduces cost.
3. using data flow control and signal switch technology, high speed data network and high-power illumination LED light chain are realized
The adaptation on road is successfully realized the engineer application of high-power illumination LED visible light communication.
Claims (10)
1. a kind of visible soft exchange network communication system based on high-power illumination LED light, it is characterized in that leading to including two visible rays
Believe system unit, be access end adapter and pci client adapter PCI respectively, easily realized using them and lead to network-termination device
Cross visible ray wireless connection Ethernet.
2. visible soft exchange network communication system according to claim 1, it is characterised in that the access end adapter, bag
It includes with the sequentially connected ethernet interface circuit of electric signal, encoding downlink signals module, downlink signal modulation module, downlink LED
Illuminate simultaneous signal of communication drive module, downlink illumination LED and with the sequentially connected uplink photosignal modulus of conversion of electric signal
Block, digital uplink signal recovery module, uplink signal demodulation module, uplink signal decoder module, multiple access AM access module.
3. visible soft exchange network communication system according to claim 2, it is characterised in that：
The downlink signal modulation module and uplink signal modulation module carry out baseband modulation to the network signal after coding,
Including symbol mapping, OFDM modulation and D/A conversions；
The downlink signal demodulation module and uplink signal demodulation module, to by visible light communication system transmission signal into
Row base band demodulating, including synchronization, IQ demodulation, channel equalization, demapping operation；
The encoding downlink signals module and uplink signal coding module scramble network signal, add targeting sequencing, letter
Road encodes and interleaving encoding operation；
The downlink signal decoder module and uplink signal decoder module, to the network after visible light communication system transmits
Signal carries out descrambling code, goes targeting sequencing, channel decoding and deinterleave operation, to extract MAC layer network signal.
4. visible soft exchange network communication system according to claim 2, it is characterised in that：
The downlink LED illumination and signal of communication drive module and uplink LED communication signal driver module are with direct current biasing electricity
Road and ac signal circuit are core, and data-signal in a manner of AC modulation is loaded into LED, has both realized the illumination functions of LED,
Data-signal is loaded on illuminating LED lamp again, and has maximally utilised the physics modulation bandwidth of great power LED；
The downstream digital signal recovery module and digital uplink signal recovery module respectively detect downlink PD and uplink PD
To ultra-weak electronic signal be amplified, filter, A/D conversions, judgement recover digital electric signal, PD is the English of photodetector
Abbreviation；In downlink photoelectric conversion module and uplink photoelectric conversion module, be respectively equipped with downlink PD and uplink PD, wherein downlink PD and
The filter plate of different colours is equipped with before uplink PD, and the filter plate before each uplink PD leaves effective bandwidth granularity, keeps away
Exempt between downlink and uplink, interference is generated between uplink and uplink, realize the wavelength-division of visible light communication
Multiplexing, so as to fulfill can access more multi-client in visible LED spectral region.
5. visible soft exchange network communication system according to claim 1, it is characterised in that the pci client adapter PCI, bag
It includes extensive with the sequentially connected equipment interface of electric signal, downlink signal decoder module, downlink signal demodulation module, downstream digital signal
It answers module, downlink photoelectric conversion module and is believed with the sequentially connected uplink LED communication signal driver module of electric signal, uplink
Number modulation module, uplink signal coding module.
6. visible soft exchange network communication system according to claim 5, it is characterised in that：
The downlink signal modulation module and uplink signal modulation module carry out baseband modulation to the network signal after coding,
Including symbol mapping, OFDM modulation and D/A conversions；
The downlink signal demodulation module and uplink signal demodulation module, to by visible light communication system transmission signal into
Row base band demodulating, including synchronization, IQ demodulation, channel equalization, demapping operation；
Network signal is scrambled the encoding downlink signals module and uplink signal coding module plus targeting sequencing, letter
Road encodes and interleaving encoding operation；
The downlink signal decoder module and uplink signal decoder module, to the network after visible light communication system transmits
Signal carries out descrambling code, goes targeting sequencing, channel decoding and deinterleave operation, to extract MAC layer network signal.
7. visible soft exchange network communication system according to claim 5, it is characterised in that：
The downlink LED illumination and signal of communication drive module and uplink LED communication signal driver module are with direct current biasing electricity
Road and ac signal circuit are core, and data-signal in a manner of AC modulation is loaded into LED, has both realized the illumination functions of LED,
Data-signal is loaded on illuminating LED lamp again, and has maximally utilised the physics modulation bandwidth of great power LED；
The downstream digital signal recovery module and digital uplink signal recovery module respectively convert downlink PD and uplink PD
Ultra-weak electronic signal be amplified, filter, A/D conversion, judgement recover digital electric signal；
In the downlink photoelectric conversion module and uplink photoelectric conversion module, downlink PD and uplink PD are respectively equipped with, wherein under
It is equipped with the filter plate of different colours before row PD and uplink PD, and the filter plate before each uplink PD is left between effective bandwidth
Every, avoid between downlink and uplink, between uplink and uplink generate interference, realize visible light communication
Wavelength-division multiplex, so as to fulfill can access more multi-client in visible LED spectral region；PD is the English contracting of photodetector
It writes.
8. visible soft exchange network communication system according to claim 1, it is characterised in that：Ethernet interface circuit output
Network signal enters encoding downlink signals module, and network signal is scrambled Signal coding module plus targeting sequencing, channel are compiled
Code and interleaving encoding operation；Encoded output signal enters downlink signal modulation module, and symbol is carried out in signal modulation module and is reflected
It penetrates, OFDM modulation and D/A conversions, the baseband modulation signal of signal modulation module output enter downlink LED illumination and signal of communication
Drive module；Downlink LED illumination and signal of communication drive module add modulated network signal and DC bias signal together
It is downloaded on downlink LED, LED sends the illumination light with the communication information；The optical signal of uplink carries out photoelectricity at uplink PD
Conversion, PD is the english abbreviation of photodetector；The analog electrical signal of output enters digital uplink signal recovery module, in number
Be amplified, filter in signal recovery module, A/D conversion and judgement, export the digital electric signal recovered；Recover what is ruled out
Digital electric signal enters uplink signal demodulation module, digital electric signal is synchronized in signal demodulation module, IQ is demodulated, letter
Trace equalization, demapping operation；Demodulated output signal enters uplink signal decoder module, is descrambled in signal decoder module
Code goes targeting sequencing, channel decoding and deinterleaves operation；Decoded output signal enters multiple access AM access module, multiple access AM access module
By time-division multiplexing method decoded output signal is controlled to enter ethernet interface circuit, carrying out rate in ethernet interface circuit fits
Match somebody with somebody and formal argument, recover MAC layer network signal and be input in Ethernet.
9. the application of any visible soft exchange network communication system in claim 1 to 8, it is characterized in that for multiple access
Mode using time-division and wavelength-division hybrid multiplex technology, realizes the visible ray multiple access network of express network.
10. application according to claim 9, it is characterized in that by Ethernet, accessing end adapter, pci client adapter PCI and net
Network equipment connects, and realizes multiple network equipments while is wirelessly linked by visible ray in Ethernet；It should
System can utilize existing illumination LED device and Ethernet facility, have the characteristics that enforcement difficulty is low, simple structure, compared with
Radio-Frequency Wireless Communication also whether there is the good advantage of electromagnetic interference, security.
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