CN102324974A - A kind of visible light communication system and device thereof based on the OCDMA technology - Google Patents
A kind of visible light communication system and device thereof based on the OCDMA technology Download PDFInfo
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Abstract
The present invention is applicable to indoor visible light communication field, proposes a kind of visible light communication system and device thereof based on the OCDMA technology.This communication system is made up of the client and server two large divisions.Wherein client is by client device (like PC, portable terminal), and OCDMA codec and light transceiver circuit are formed.Server is by server apparatus, and OCDMA codec and light transceiver circuit are formed.The system that the present invention proposes has realized the duplex communication and the secure communication of internal home network, and can enter the Internet, and uploads and data download to the internet.
Description
Technical field
The present invention relates to a kind of visible light communication system and device thereof, be applicable to indoor visible light communication network based on the OCDMA technology.Be particularly related to the two-way link realized communication, visible light communication system and the device thereof of secure communication and IP Over VLC (Visible Light Communication) based on the OCDMA technology.
Background technology
The visible light communication technology is a kind of emerging wireless light communication technology that grows up in the white light LEDs invention and after using.LED not only can provide room lighting, and can be applied to and satisfy indoor personal network's demand in the radio optical communication system.It is safer that visible light communication will offer people, easily communication environment.There is not electromagnetic radiation in it, and is more healthy to human body.The led light source that is used to communicate by letter can be installed in the place of any needs, can realize the high speed wireless data transmission easily, and need not radio-frequency spectrum card, no electromagnetic interference.
The main application of visible light wireless communication technology can be divided into outdoor communication and indoor communications two big classes.Present application also only limits to indoor communications, is mainly used in the indoor communications network, can realize simplex.For example will store good video source data, and send down with light signal through the white light LED array on indoor roof, near the equipment the ground can receive this light signal, and finally is reduced to the video data of transmission after handling, and it is played back in display.
At present, indoor visible light communication system has only been realized simplex, can carry out downlink communication.How to realize that two-way link communication becomes visible light communication Study on Technology focus, realize that duplex communication is that LED visible light communication practicability must solve.When system carried out downlink communication in addition, each equipment all can be received this signal, if data are not used to broadcast, then can't guarantee the confidentiality of data.And present indoor visible light communication system can't enter the Internet, and can not upload and data download to the internet, and these all are the shortcomings of system.
Summary of the invention
The objective of the invention is to the above-mentioned shortcoming on the prior art, propose a kind ofly can realize duplex communication, secure communication and can with the indoor visible light communication system and the device thereof of Internet exchange data.OCDMA is a kind of spread spectrum in the light territory, can the dynamic bandwidth allocation resource realize the direct multiplexing of light signal and exchange, good confidentiality, and antijamming capability is strong, is the multiple access technology with bright prospects.This communication system utilizes the OCDMA technology to solve two-way link communication issue and privacy problem, and can realize carrying out real-time communicating by letter, swap data with the internet.
The present invention also provides a kind of visible light communication system device based on the OCDMA technology, and as shown in Figure 1, this communication system is made up of the client and server two large divisions.Wherein client is by client device (like PC, portable terminal), and OCDMA codec and light transceiver circuit are formed.Server is by server apparatus, and OCDMA codec and light transceiver circuit are formed.Wherein the OCDMA coder structure is as shown in Figure 2, and the OCDMA decoder architecture is as shown in Figure 3.
The internal home network communication process of whole system is: communicate through the visible light communication technology based on OCDMA between the server and client side.During uplink communication, distribute one to carry out the required address of OCDMA coding according to communication protocol for each client, server goes out the data that relative client is sent according to corresponding address resolution.During downlink communication, when server needed broadcast message, for it distributes the public address that all clients are all known, all clients can parse the data that server sends like this.When server needs to communicate with some clients specially, then, have only this client just can parse the data that server sends like this for it distributes an address of having only this client and server just to know.For the ease of the receiving terminal separation signal, light orthogonal code is adopted in the OCDMA address of whole system.Communication system proposed by the invention is a two-way link, and the uplink communication process is that the data of client are at first encoded through the OCDMA encoder, and the signal behind the coding converts visible light signal to through optical transmission circuit again and propagates in indoor channel.After optical receiving circuit on the server receives light signal, convert thereof into the signal of telecommunication and send into the OCDMA decoder and decode, recover the initial data that client is sent at last, it is passed to server.The downlink communication process is that data in server is at first encoded through the OCDMA encoder, and the signal behind the coding converts visible light signal to through optical transmission circuit again and propagates in indoor channel.After optical receiving circuit on the client receives light signal, convert thereof into the signal of telecommunication and send into the OCDMA decoder and decode, recover the initial data that server sends at last, it is passed to client, so just realized indoor duplex communication and secure communication.
The communication process of system and internet is: server apparatus has Ethernet interface, and is furnished with network interface card, can upload and data download to the internet, still adopts ICP/IP protocol when whole indoor communication system and internet communicate.The uplink communication process is the data of client at first are converted into physical layer through ICP/IP protocol a bit stream, again it is sent into the OCDMA encoder and encodes, and the signal behind the coding converts visible light signal to through optical transmission circuit again and propagates in indoor channel.After optical receiving circuit on the server receives light signal, convert thereof into the signal of telecommunication and send into the OCDMA decoder and decode, recover the physical layer bit stream that client is sent at last, it is passed to server, server is uploaded to the internet with it again.The downlink communication process be server after the Internet data, at first the physical layer bit stream is encoded through the OCDMA encoder, the signal behind the coding converts visible light signal to through optical transmission circuit again and propagates in indoor channel.After optical receiving circuit on the client receives light signal; Convert thereof into the signal of telecommunication, send into the OCDMA decoder and decode, recover the physical layer bit stream that server sends at last; It is passed to client, and client recovers the data from Internet according to ICP/IP protocol again.So just realized carrying out real-time communicating by letter, and can upload and data download to the internet with the internet.The sketch map of whole network is as shown in Figure 4.
The present invention has following technical advantage and beneficial effect:
1) utilize the OCDMA good confidentiality, antijamming capability is strong, can carry out the technical advantage that multiple access distributes, and has realized indoor two-way link communication.
2) realized the secure communication of data.
3) can carry out real-time communicating by letter with the internet, upload and data download, make the information source variation of communication system, flexibility to the internet.
Description of drawings
Through the description of carrying out below in conjunction with accompanying drawing to embodiment, above-mentioned and/or other purposes of the present invention and advantage will become apparent, wherein:
Fig. 1 illustrates the structure chart of visible light communication system.Wherein:
The 101st, client terminal device is used for the reception server data and sends data to server;
The 102nd, the OCDMA codec of client terminal device, when uplink communication, client terminal device sends to the OCDMA encoder with its data and encodes, and when downlink communication, client terminal device receives the decoded data of OCDMA decoder;
The 103rd, emission of the light of client terminal device and optical receiving circuit, when uplink communication, the signal of telecommunication after coded is converted into light signal and in indoor channel, propagates optical transmission circuit with the OCDMA encoder.When downlink communication, optical receiving circuit is converted into the signal of telecommunication with light signal and sends to the OCDMA decoder and decode;
The 104th, emission of the light of server unit and optical receiving circuit, when uplink communication, optical receiving circuit is converted into the signal of telecommunication with light signal and sends to the OCDMA decoder and decode.When downlink communication, the signal of telecommunication after coded is converted into light signal and in indoor channel, propagates optical transmission circuit with the OCDMA encoder;
The 105th, the OCDMA codec of server unit, when uplink communication, server unit receives the decoded data of OCDMA decoder.When downlink communication, server unit sends to the OCDMA encoder with its data and encodes, the N among the figure OCDMA codec, and corresponding N client is respectively the corresponding client end data and carries out encoding and decoding;
The 106th, server unit is used to receive client data and sends data to client, can upload and data download to the internet simultaneously.
Fig. 2 illustrates the structure chart of the OCDMA encoder of using in this communication system.Wherein:
The 201st, the electric pulse maker is used for producing the needed electric pulse of photoelectric coder, and the burst length width is a chip period;
The 202nd, photoelectric coder, it postpones different chip period respectively with electric pulse, thereby produces corresponding code word;
The 203rd, data source to be encoded.After the code word that it and photoelectric coder are generated multiplied each other through multiplier, the data after obtaining encoding were connected to optical transmission circuit with it again, are electrical signal conversion that light signal is propagated in indoor channel.
Fig. 3 illustrates the structure chart of the OCDMA decoder of using in this communication system.Wherein:
The 301st, electric signal amplifier, it amplifies the signal of telecommunication of optical receiving circuit output, is convenient to electric decoder and decodes.
The 302nd, electric decoder, it will produce the code word identical with photoelectric coder, and the signal of code word and electric signal amplifier output is carried out related operation, send into Data Recapture Unit at last.
The 303rd, Data Recapture Unit, it will sample and adjudicate the signal of electric decoder output, finally recover the initial data of OCDMA encoder before coded.
Fig. 4 illustrates the sketch map of visible light communication system.Wherein:
The 401st, server unit is used to receive client data and sends data to client, can upload and data download to the internet simultaneously;
The 402nd, the OCDMA codec of server unit, when uplink communication, server unit receives the decoded data of OCDMA decoder.When downlink communication, server unit sends to the OCDMA encoder with its data and encodes;
The 403rd, white light LED array is the optical transmission circuit of server unit, and when downlink communication, the signal of telecommunication after coded is converted into light signal and in indoor channel, propagates optical transmission circuit with the OCDMA encoder;
The 404th, the photodiode in the server unit optical receiving circuit, when uplink communication, optical receiving circuit is converted into the signal of telecommunication with light signal and sends to the OCDMA decoder and decode;
The 405th, PC is represented the client device of fixed-site.Its also should in succession OCDMA codec and light transceiver circuit omits in this figure;
The 406th, portable terminal like mobile phone, is being represented the transportable client device in position.Its also should in succession OCDMA codec and light transceiver circuit omits in this figure.
Embodiment
Through with reference to down in the face of the embodiment and the detailed description of accompanying drawing of exemplary indefiniteness, advantage of the present invention and characteristic and realize that method of the present invention can be easier to understanding.Yet the present invention can implement with multiple different form, and the embodiment that should not be construed as limited in this explaination.In addition, thus provide these embodiment this openly will be completely and completely, and will intactly design of the present invention be conveyed to those skilled in the art, the present invention will only be defined by accompanying claims.
In the present embodiment with client from Internet with to upload mail to the internet be example, be described in detail visible light communication system of the present invention and how device communicates by letter with reference to Fig. 1 and Fig. 4.As shown in Figure 4; When client during from Internet mail 1; Server is at first from Internet mail 1, lets PC and mobile phone all know the content of this envelope mail if desired, so the OCDMA coded address just all known with a PC and mobile phone this moment of server; For the ease of the receiving terminal separation signal, light orthogonal code is adopted in the OCDMA address of whole system.Such as code word is (49; 1,2,21,24).Server will be sent into the OCDMA encoder from the physical layer bit stream that Ethernet interface receives.The OCDMA encoder is according to code word (49; 1,2,21,24) with its coding, the signal after will encoding is then passed to optical transmission circuit and the signal of telecommunication is converted into light signal is propagated in indoor channel.After optical receiving circuit on PC and the mobile phone receives this light signal, be translated into the signal of telecommunication and send into the OCDMA decoder again, according to code word (49; 1,2,21,24) decode, recover the physical layer bit stream that server sends, according to ICP/IP protocol it is recovered mail 1 data at last.PC and mobile phone have just all been received mail 1 content from Internet like this.If mail 1 content is only wanted to let mobile phone know, server is (49 just with an OCDMA coded address of having only mobile phone just to know such as code word so; 1,3,14,18),, have only the mobile phone can enough code words (49 though the optical receiving circuit of PC and mobile phone has all been received this light signal like this; 1,3,14,18) recover the preceding data of coding.
When client when mail is uploaded in the internet, for example PC will be uploaded mail 2, mobile phone will be uploaded mail 3.At first mobile phone and PC are converted into the physical layer bit stream with the content of mail according to ICP/IP protocol, then it are sent into the OCDMA encoder.Can distinguish out for server is the data which client is sent, and mobile phone and PC will adopt different code word to encode, and adopts light orthogonal code, and for example the coding codeword of PC is (49; 1,6,13,22), the coding codeword of mobile phone is (49; 1,7,15,25).After the OCDMA encoder of PC and mobile phone is encoded with different code word respectively like this, signal is passed to optical transmission circuit be converted into light signal to the signal of telecommunication and propagate in indoor channel.After the optical receiving circuit of server receives this light signal, be translated into the signal of telecommunication and send into two OCDMA decoders more simultaneously, one according to code word (49; 1,6,13,22) decode, recover the physical layer bit stream that PC sends, its corresponding content of mail 2 is uploaded to the internet with it at last.Another OCDMA decoder is according to code word (49; 1,7,15,25) decode, recover the physical layer bit stream that mobile phone sends, its corresponding content of mail 3 is uploaded to the internet with it at last.
The invention is not restricted to the foregoing description, without departing from the present invention, can carry out various distortion and modification.As can change the coding codeword of PC into (49; 1,4,9,16).
Claims (7)
1. indoor visible light communication system, this communication system is grouped into by client part and department server.It is characterized in that:
Client part comprises: client device (like PC, portable terminal), OCDMA codec and light transceiver circuit.
Server section comprises: server apparatus, OCDMA codec and light transceiver circuit.
2. communication system according to claim 1 is characterized in that: client device is used for transmitting and receive data, and can accomplish the mutual conversion between application layer data and the physical layer bit stream according to ICP/IP protocol.Server apparatus has Ethernet interface, and is furnished with network interface card, can upload and data download to the internet.
3. communication system according to claim 1 is characterized in that: the OCDMA codec can carry out encoding and decoding to the signal of telecommunication, and its structure such as Figure of description 2 are with shown in Figure 3.The light transceiver circuit can be accomplished the conversion of photosignal.
4. communication system according to claim 1 is characterized in that: during uplink communication, distribute one to carry out the required address of OCDMA coding according to communication protocol for each client, server goes out the data that relative client is sent according to corresponding address resolution.During downlink communication, when server needed broadcast message, for it distributes the public address that all clients are all known, all clients can parse the data that server sends like this.When server needs to communicate with some clients specially, then, have only this client just can parse the data that server sends like this for it distributes an address of having only this client and server just to know.For the ease of the receiving terminal separation signal, light orthogonal code is adopted in the OCDMA address of whole system.
5. communication system according to claim 1; It is characterized in that: when internal home network communicates; The uplink communication process is that the data of client are at first encoded through the OCDMA encoder, and the signal behind the coding converts visible light signal to through optical transmission circuit again and propagates in indoor channel.After optical receiving circuit on the server receives light signal, convert thereof into the signal of telecommunication and send into the OCDMA decoder and decode, recover the initial data that client is sent at last, it is passed to server.The downlink communication process is that data in server is at first encoded through the OCDMA encoder, and the signal behind the coding converts visible light signal to through optical transmission circuit again and propagates in indoor channel.After optical receiving circuit on the client receives light signal, convert thereof into the signal of telecommunication and send into the OCDMA decoder and decode, recover the initial data that server sends at last, it is passed to client.
6. communication system according to claim 1; It is characterized in that: the communication process of system and internet is: server apparatus has Ethernet interface; And is furnished with network interface card; Can upload and data download to the internet, still adopt ICP/IP protocol when whole indoor communication system and internet communicate.The uplink communication process is the data of client at first are converted into physical layer through ICP/IP protocol a bit stream, again it is sent into the OCDMA encoder and encodes, and the signal behind the coding converts visible light signal to through optical transmission circuit again and propagates in indoor channel.After optical receiving circuit on the server receives light signal, convert thereof into the signal of telecommunication and send into the OCDMA decoder and decode, recover the physical layer bit stream that client is sent out at last, it is passed to server, server is uploaded to the internet with it again.The downlink communication process be server after the Internet data, at first the physical layer bit stream is encoded through the OCDMA encoder, the signal behind the coding converts visible light signal to through optical transmission circuit again and propagates in indoor channel.After optical receiving circuit on the client receives light signal; Convert thereof into the signal of telecommunication, send into the OCDMA decoder and decode, recover the physical layer bit stream that server is sent out at last; It is passed to client, and client recovers the data from Internet according to ICP/IP protocol again.So just realized carrying out real-time communicating by letter, and can upload and data download to the internet with the internet.
7. communication system according to claim 1 is characterized in that: this visible light communication system can be realized duplex communication and secure communication, and can enter the Internet, and uploads and data download to the internet.
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| CN102710329A (en) * | 2012-05-09 | 2012-10-03 | 中国人民解放军信息工程大学 | Method and system for transparently transmitting full-IP (internet protocol) visible light data |
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| CN102904638A (en) * | 2012-10-23 | 2013-01-30 | 江苏学府医疗科技有限公司 | LED (light-emitting diode)-based indoor wireless optical communication OCDMA (Optical Code Division Multiple Access) upstream communication system |
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| CN106850077A (en) * | 2017-01-11 | 2017-06-13 | 北京大学 | A kind of wireless coherent CDMA optical communication system and communication means |
| CN109004978A (en) * | 2017-06-07 | 2018-12-14 | 天津职业技术师范大学 | A kind of LED based indoor visible light communication application system |
| TWI686061B (en) * | 2017-07-07 | 2020-02-21 | 張清亮 | Wireless optical communication method for realizing image encryption and decryption |
| CN109756265A (en) * | 2017-11-03 | 2019-05-14 | 天津职业技术师范大学 | Real time full duplex connecting internet system based on LED visible light communication |
| CN109194401A (en) * | 2018-10-25 | 2019-01-11 | 华南理工大学 | A kind of visible light communication system and communication means with function of keeping secret |
| CN111211835A (en) * | 2018-11-21 | 2020-05-29 | 绍兴钠钇光电有限公司 | Visible light communication method based on hidden channel |
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