CN106059662A - Ultraviolet communication device - Google Patents

Ultraviolet communication device Download PDF

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Publication number
CN106059662A
CN106059662A CN201610551462.1A CN201610551462A CN106059662A CN 106059662 A CN106059662 A CN 106059662A CN 201610551462 A CN201610551462 A CN 201610551462A CN 106059662 A CN106059662 A CN 106059662A
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CN
China
Prior art keywords
transmitting
antenna
conversion module
ultraviolet
receiving
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Pending
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CN201610551462.1A
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Chinese (zh)
Inventor
何华
姜静
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Xian University of Posts and Telecommunications
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Xian University of Posts and Telecommunications
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Priority to CN201610551462.1A priority Critical patent/CN106059662A/en
Publication of CN106059662A publication Critical patent/CN106059662A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses an ultraviolet communication device, relates to the technical field of wireless optical communication, and is used for solving the problem that the ultraviolet communication coverage range is small in the prior art. The device comprises a transmitting node and receiving nodes, wherein the transmitting node comprises an electric-optical conversion module and multiple transmitting antenna sub-arrays; each transmitting antenna sub-array comprises multiple transmitting antennas; the electric-optical conversion module is respectively connected to various transmitting antennas; the electric-optical conversion module converts an electric signal into an ultraviolet signal; the number of the receiving nodes is equal to the number of the transmitting antenna sub-arrays; the receiving nodes and the transmitting antenna sub-arrays are in one-to-one correspondence communication; each receiving node comprises a receiving antenna and a photoelectric conversion module; the receiving antenna is connected with the photoelectric conversion module; various transmitting antennas in the transmitting antenna sub-arrays are in optical communication connection with the receiving antennas of the corresponding receiving nodes; and, after being received by the receiving antennas, the ultraviolet signal is converted into a corresponding electric signal through the photoelectric conversion module.

Description

A kind of ultraviolet communication device
Technical field
The present invention relates to wireless light communication technical field, more particularly relate to a kind of ultraviolet communication device.
Background technology
FSO is the means of communication that a kind of development prospect is good.The spectrum of solar radiation according to wavelength from greatly Being followed successively by infrared light, visible ray and ultraviolet light to little, they can serve as the carrier of information in communication.
The shortcoming of infrared communication is very strict, much to alignment request to transmitting terminal and receiving terminal of communication equipment In the case of cannot meet, when especially having barrier between transmitting-receiving two-end；Visible ray is affected by bias light when communication to be compared More serious, therefore the signal to noise ratio of receiving terminal is relatively low；And ultraviolet light exactly can overcome infrared light to show when communicating with visible ray Shortcoming out, it is not only able to relax transmitting terminal and communicates with the non-direct-view that carries out alignment request of receiving terminal, and is utilizing When " day is blind " wave band ultraviolet light of 200nm～280nm communicates, owing to background noise is minimum, it is obtained in that relatively at receiving terminal High signal to noise ratio, but owing to ultraviolet wavelength is shorter, air is stronger to absorption and the scattering process of ultraviolet light so that ultraviolet light Energy attenuation quickly, cannot detect outside certain coverage.
In sum, there is the problem that coverage is little in existing ultraviolet communication.
Summary of the invention
The embodiment of the present invention provides a kind of ultraviolet communication device, covers in order to solve to there is ultraviolet communication in prior art The problem that lid scope is little.
The embodiment of the present invention provides a kind of ultraviolet communication device, including: transmitting node and multiple receiving node；
Described transmitting node includes electrooptic conversion module and multiple transmitting sub-array antenna, each described transmitting antenna submatrix Comprising multiple transmitting antenna in row, described electrooptic conversion module is connected with each described transmitting antenna respectively, described electro-optic conversion Module converts electrical signals to ultraviolet signal, and by the output of described ultraviolet signal to each described transmitting antenna；
The quantity of described receiving node is equal with the quantity of described transmitting sub-array antenna, described receiving node and described Penetrating sub-array antenna one_to_one corresponding to communicate, each described receiving node all includes reception antenna and photoelectric conversion module, institute State reception antenna to be connected with described photoelectric conversion module；
Each described transmitting antenna in described transmitting sub-array antenna all with the reception sky of corresponding described receiving node Linear light communicates to connect, and described reception antenna is converted to corresponding electricity by described photoelectric conversion module after receiving described ultraviolet signal Signal.
It is preferred that a length of 200nm～280nm of light wave of described electrooptic conversion module output.
In the embodiment of the present invention, it is provided that a kind of ultraviolet communication device, this device is in order to expand the covering of ultraviolet communication Scope, combines ultraviolet communication with MIMO multi-antenna technology, utilizes the space diversity in multi-antenna technology and spatial reuse Strategy, can meet communication range simultaneously and expand and the demand of multi-user communication；Further, on the basis of point-to-point ultraviolet communication On, application MIMO beam antenna is oriented communication can increase capacity and the frequency of network of ultraviolet light non-direct-view communication system Rate utilization rate, by the combination with SDMA technology, utilizes the space propagation path that ultraviolet signal is different, can effectively distinguish phase Same time slot, same frequency, the ultraviolet signal of identical address code, MIMO technology is tied mutually with " day is blind " ultra-violet optical communication system Close, the inherent shortcoming of ultraviolet communication can be compensated for.
Accompanying drawing explanation
A kind of ultraviolet communication apparatus structure schematic diagram that Fig. 1 provides for the embodiment of the present invention.
Communication between single node based on ultraviolet communication device and multinode that Fig. 2 provides for the embodiment of the present invention is shown It is intended to.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.
What Fig. 1 was exemplary shows a kind of ultraviolet communication device that the embodiment of the present invention provides.As it is shown in figure 1, this A kind of ultraviolet communication device that bright embodiment provides, including: transmitting node and multiple receiving node.
Specifically, transmitting node includes electrooptic conversion module and multiple transmitting sub-array antenna, each transmitting antenna submatrix Comprising multiple transmitting antenna in row, electrooptic conversion module is connected with each transmitting antenna respectively, and electrooptic conversion module is by the signal of telecommunication Be converted to ultraviolet signal, and by ultraviolet signal output to each transmitting antenna.
Specifically, the quantity of receiving node is equal with the quantity launching sub-array antenna, receiving node and transmitting antenna Array one_to_one corresponding communicates, and each receiving node all includes reception antenna and photoelectric conversion module, reception antenna and photoelectricity Modular converter connects；
Specifically, launch each transmitting antenna in sub-array antenna all to lead to the reception antenna light of corresponding receiving node Letter connects, and reception antenna is converted to the corresponding signal of telecommunication by photoelectric conversion module after receiving ultraviolet signal.
It should be noted that the transmitting antenna in transmitting sub-array antenna uses space diversity technology to carry out same signal Multichannel is transmitted simultaneously；Launching the transmitting antenna between sub-array antenna uses space multiplexing technique to realize a transmitting node with multiple Receiving node communicates simultaneously, and wherein, the transmitting angle of divergence of transmitting node is with the field of view of receiver angle of corresponding receiving node aloft Produce common scattering object.
It is preferred that electrooptic conversion module output be wavelength be 200nm～280nm " day is blind " wave band ultraviolet light, in profit When communicating with " day is blind " wave band ultraviolet light of 200nm～280nm, background noise is minimum, is obtained in that higher at receiving terminal Signal to noise ratio.
It should be noted that the beam direction launching sub-array antenna is oppositely arranged in opposite directions with corresponding reception antenna, can To realize the beam communication of space diversity.
It should be noted that the horizontal dimensions direction of each transmitting antenna in transmitting sub-array antenna is consistent, difference exists Different, on the beam shaping of the most each transmitting antenna to different height in vertical dimensions.
It should be noted that install multiaerial system on each ultraviolet communication node, multiaerial system will be according to need Want, complete the purpose of space diversity and spatial reuse.
Specifically, space diversity technology can carry out multichannel to same signal and transmit simultaneously, can effectively evade communication The interruption of link, it is to avoid all roads signal is simultaneously by having a strong impact on that air declines.Space diversity technology is to study how to fill Divide the multipath signal energy utilized in transmission, to improve the reliability of transmission.It is a basic parameter utilizing signal time How territory, frequency domain, with spatial domain, disperse the most collected technology.Some separate branch roads are obtained at receiving terminal After signal, diversity gain can be obtained by folding.This ultraviolet light MIMO multi-user system uses equal gain combining Reception diversity, is only corrected the phase offset of signal and amplitude is not corrected.Its output result Shi Ge road signal width The superposition of value.
It should be noted that launching diversity is to use multiple transmitting antennas to launch identical information at transmitting terminal, receiving End obtains the signal to noise ratio higher than single antenna.
Specifically, space multiplexing technique is primarily to improve the transfer rate of system, by launching mutually at transmitting terminal Independent signal, and carry out AF panel by precoding.Launch the spacing between antenna and reception antenna more than correlation distance Being the essential condition realizing spatial reuse, each subchannel in such guarantee sending and receiving end is the uncorrelated channel of independent decline.If Each dual-mode antenna is separate to the path fading between it, then can build multiple parallel spatial sub-channel, at this Transmitting different flow of information between the most parallel subchannel, data transmission rate can be obtained by promoting.Spatial reuse at transmitting terminal and Receiving terminal all uses many antennas, makes full use of the multipath component in spatial transmission, only makes the transmitting signal of multiple data channel Take a frequency band, so that incremental and linearly increasing along with number of antennas of channel capacity.This channel is being not take up volume Outer bandwidth and while increasing channel capacity, also will not consume extra transmitting power, be therefore a kind of improve channel capacity and The effective scheme of systematic function.
It should be noted that spatial reuse is to realize by launching separate signal on different antennas simultaneously The High Data Rate of MlMO system and high spectrum utilization. the high-speed data-flow of transmitting is divided into several parallel low speed data Stream, launches from multiple antennas at same frequency band simultaneously. and due to multipath transmisstion, each transmitting antenna produces for receiver Different spatial signature, receiver utilizes these different signatures to isolate independent data stream, reverts to original number the most again According to stream. message transmission rate can be significantly improved.
Further, spatial reuse can make a certain node communicate with multiple nodes simultaneously, as long as transmitting node Launch the angle of divergence and can aloft produce common scattering object with the field of view of receiver angle of corresponding receiving node, it is possible to communication.
It should be noted that SDMA is the letter that space division multiple access accesses (Spatial Divided Multiple Access) Claim.
Communication between single node based on ultraviolet communication device and multinode that Fig. 2 provides for the embodiment of the present invention is shown It is intended to.As in figure 2 it is shown, illustrate a kind of ultraviolet communication device Principle of Communication that the embodiment of the present invention provides.
It is assumed that known node A, the positional information of B, C, D, then, can will be assigned to the sub antenna of node B on A node Array utilizes beam shaping, is adjusted to the direction of this sub antenna array beams towards B node, and B node is by the reception of oneself Antenna is towards A node.So, A node and B node are achieved that beam communication, and achieve the beam communication of space diversity.? When node A and node B carries out space diversity beam communication, A distributes to the sub-array antenna beam shaping by this array antenna of B Direction is adjusted on B direction, and the horizontal dimensions direction of each antenna element on subarray is consistent, and difference is vertical dimensions, The beam shaping on each antenna element on subarray on different height, the channel model that is thusly-formed as in figure 2 it is shown, Transmitting node A and receiving node B, C, D the most aloft define common scattering object.
It should be noted that the every both threads in Fig. 2 represents that the dash area in an antenna element, and Fig. 2 represents altogether Same scattering object.
It should be noted that by the relative position knowing receiving node B, C, D and transmitting node A, b by transmitting node The launching beam beam shaping of A in receiving node B, C, D orientation, can calculate transmitting node A to receiving node B, C, D Launching power, concrete reckoning process is as follows:
If the coordinate of transmitting node A point is that (x, y), the coordinate of receiving node B point, C point and D point is respectively B (x to AB,yB), C (xC,yC) and D (xD,yD), and the coordinate of B point, C point and D point can be as the rectangular coordinate system centered by A point, A to be obtained Point is assigned to the beam shaping of each reception subarray antenna to the direction of B point, C point and D point, should take corresponding angle and distinguish For:
θ B A = a r c t a n ( y B - y x B - x ) , θ C A = a r c t a n ( y C - y x C - x ) , θ D A = a r c t a n ( y D - y x D - x ) .
A point is as follows to the channel model of B point:
r B = ( x B - x ) 2 + ( y B - y ) 2 ,
r B 1 = ( x B - x ) 2 + ( y B - y ) 2 · sinθ B 2 sinθ B S ,
r B 2 = ( x B - x ) 2 + ( y B - y ) 2 · sinθ B 1 sinθ B S ,
θBS=θB1+θB2。
Wherein, HBATransmitting power for A point to B point；PtPower is always launched for transmitting node；PsFor Scattering Phase Function；Ks For scattering coefficient；ArFor receiving aperture size；λ is ultraviolet wavelength；KeFor absorptance；rBFor the distance between A point and B point； rB1Distance for A point Yu common scattering object；rB2Distance for common scattering object Yu B point；V is common with what B point was formed by A point The volume of scattering object；θB1For the transmitting drift angle of A point between A point and B point；θB2For the reception drift angle of B point between A point and B point； For launching the angle of divergence；For field of view of receiver angle；The value of n depend on A point distribute to B point make diversity subarray antenna Number.
By that analogy, it is possible to obtain the transmitting power H of A point to C pointCA, and A point is to the channel parameter transmitting power of D point.
In sum, a kind of ultraviolet communication device that the embodiment of the present invention provides, this device leads to expand ultraviolet light The coverage of letter, combines ultraviolet communication with MIMO multi-antenna technology, utilize space diversity in multi-antenna technology with Spatial reuse strategy, can meet communication range simultaneously and expand and the demand of multi-user communication；Further, lead at point-to-point ultraviolet light On the basis of letter, application MIMO beam antenna be oriented communication can increase ultraviolet light non-direct-view communication system capacity and The frequency efficiency of network, by the combination with SDMA technology, utilizes the space propagation path that ultraviolet signal is different, Ke Yiyou Effect distinguishes identical time slot, same frequency, and the ultraviolet signal of identical address code, by MIMO technology and " day is blind " ultraviolet communication system System combines, and can compensate for the inherent shortcoming of ultraviolet communication.
The several specific embodiments being only the present invention disclosed above, the present invention can be carried out by those skilled in the art Various changes and modification without departing from the spirit and scope of the present invention, if the present invention these amendment and modification belong to the present invention Within the scope of claim and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (2)

1. a ultraviolet communication device, it is characterised in that including: transmitting node and multiple receiving node；
Described transmitting node includes electrooptic conversion module and multiple transmitting sub-array antenna, in each described transmitting sub-array antenna Comprising multiple transmitting antenna, described electrooptic conversion module is connected with each described transmitting antenna respectively, described electrooptic conversion module Convert electrical signals to ultraviolet signal, and by the output of described ultraviolet signal to each described transmitting antenna；
The quantity of described receiving node is equal with the quantity of described transmitting sub-array antenna, described receiving node and described transmitting sky Line subarray one_to_one corresponding communicates, and each described receiving node all includes reception antenna and photoelectric conversion module, described in connect Receive antenna to be connected with described photoelectric conversion module；
Each described transmitting antenna in described transmitting sub-array antenna all with the reception antenna light of corresponding described receiving node Communication connection, described reception antenna is converted to corresponding telecommunications by described photoelectric conversion module after receiving described ultraviolet signal Number.
2. device as claimed in claim 1, it is characterised in that a length of 200nm of light wave of described electrooptic conversion module output～ 280nm。
CN201610551462.1A 2016-07-13 2016-07-13 Ultraviolet communication device Pending CN106059662A (en)

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CN112910552A (en) * 2019-12-03 2021-06-04 Oppo广东移动通信有限公司 LiFi communication device and electronic equipment

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CN103346835A (en) * 2013-07-10 2013-10-09 唐笛恺 High-speed visible light multiple-input multiple-output system and communication method thereof
CN104919716A (en) * 2013-02-15 2015-09-16 英特尔公司 Methods for energy-efficient unicast and multicast transmission in a wireless communication system
CN104980216A (en) * 2015-06-10 2015-10-14 清华大学 Multiple-input-multiple-output visible light MIMO system
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CN103023612A (en) * 2012-11-30 2013-04-03 南京邮电大学 Precoding MU-MIMO (Multiuser-Multiple Input Multiple Output) indoor visible light communication system based on white light LED (Light-emitting Diode)
CN104919716A (en) * 2013-02-15 2015-09-16 英特尔公司 Methods for energy-efficient unicast and multicast transmission in a wireless communication system
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112910552A (en) * 2019-12-03 2021-06-04 Oppo广东移动通信有限公司 LiFi communication device and electronic equipment
CN112910552B (en) * 2019-12-03 2023-09-01 Oppo广东移动通信有限公司 LiFi communication device and electronic equipment

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