CN109347557A - A kind of multiple-input and multiple-output optical communication system and communication means based on filter effect - Google Patents
A kind of multiple-input and multiple-output optical communication system and communication means based on filter effect Download PDFInfo
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- CN109347557A CN109347557A CN201811422463.1A CN201811422463A CN109347557A CN 109347557 A CN109347557 A CN 109347557A CN 201811422463 A CN201811422463 A CN 201811422463A CN 109347557 A CN109347557 A CN 109347557A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/112—Line-of-sight transmission over an extended range
- H04B10/1121—One-way transmission
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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
- H04B10/1141—One-way transmission
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Abstract
The multiple-input and multiple-output optical communication system based on filter effect that the invention discloses a kind of, including transmitting terminal and receiving end.Transmitting terminal includes that light intensity modulator and the optical signal being attached thereto send array, and receiving end includes preposition device, filtering device, detector and signal processing unit.Wherein, preposition device makes optical signal send the different parts that the wherein light beam that each signal sending zone light source is issued in array is incident on filtering device surface with fixed angle respectively.The present invention is by being divided into many a unlike signal sending zones for optical signal transmission array, the signal light that each region inner light source is emitted is in the pixel elements being incident upon respectively in detector unlike signal receiving area after filtering, to carry out multiple signals parallel transmission using the modulation light that multiple light sources issue.Finally, by the way that pixel elements institute measured data in different zones is updated to multiple matrix equation release signals respectively.The technology can realize the transmission of large capacity signal while realizing illumination functions.
Description
Technical field
The present invention relates to a kind of optical communication system based on filter effect and its signal is sent and coding/decoding method, and it is logical to belong to light
Believe technical field.
Background technique
It can be seen that optical communication (VLC, Visible Light Communication) be exactly using the light of visible light wave range as
Information carrier directly transmits the communication mode of optical signal without the transmission medium of the wire channel such as optical fiber in air.It is simple next
Say, as long as thering is light to shine on the crown, theoretically either transmitting data information, online, or carry out voice, video calling,
Also or the switch of instrumentality networked devices, can easily realize, and by the transmission rate of superelevation, it is remote super using experience
WiFi and 4G network.
Thus it is clear that optical communication technology green low-carbon environment-friendly, can be realized almost zero energy consumption communication, also can effectively avoid
Signal leakage, can quickly construct anti-interference, anti-intercepting and capturing security information space.Tens billion of a lighting apparatus and others are set
Standby fusion will constitute a very large visible light communication network.It is expected that the whole world will have super more 50,000,000,000 equipment after 5 years
Internet is accessed, wherein most will will use wireless network, this will lead to Radio Spectrum Resource anxiety, and then influence to make
With.And VLC is using light wave that unconventional radio wave is communicated, while the bandwidth of VLC is the 1000 of radio-frequency spectrum
Times or more, it can solve the problem of frequency spectrum resource anxiety.Moreover, because LED (light emitting diode, Light Emitting
Diode, LED) lamp than previous fluorescent lamp and incandescent lamp can support faster switching speed.In this way by giving commonly
LED light installs microchip additional, LED light can be made to flash at a terrific speed, to can send number more quickly using LED light
According to.In order to further increase the signal transmission capacity in the unit time, many seminars attempt by multiple-input and multiple-output (MIMO,
Multiple-Input Multiple-Output) Radio Transmission Technology is combined with visible light communication technology.MIMO is logical
One important technology in letter field is broken through, it can double up wireless communication system in the case where not increasing bandwidth and power
Capacity.MIMO technology is transmitted by sending independent data flow in different emission sources with obtaining high speed high capacity data, is
One of key technology in new generation of wireless communication system.
The visible optical communication technology of multiple-input and multiple-output (VLC-MIMO) has huge market application prospect, but there is also one
A little problems.Such as: (1) in tradition VLC-MIMO technology different channels use the signal optical source of narrow-band spectrum, but such light source
Color is single, can not be using white light source used in traditional lighting.(2) although some VLC-MIMO technologies can use white light light
Source, but require each white light source frequency spectrum mutual be overlapped but it is not exactly the same, how many channel requires more in this way
Few different light source or filtering film, to improve the cost of system.(3) also some VLC-MIMO technologies use two dimensional code
Technology carries out Signal coding, but the coding rule of two dimensional code is complicated, therefore is arranged with particular/special requirement to light source, and signal emits
Light source can only use point light source, and can not use area source, reduce the comfort level of human eye.(4) there are also some seminars to use
Technology in, light emitting end needs the transmission mode of the wavelength of accurate control light carrier, polarization state or incident optical, in light-receiving
End using the biggish detector of volume and need to place specific angle, or using complicated demultiplexer by wavelength, polarization state,
And transmission mode is separated to restore to transmit data, therefore system structure is complicated, higher cost.In order to overcome disadvantage mentioned above,
We have proposed a kind of novel multiple-input-multiple-output communication systems and its communication means based on filter effect.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a kind of based on the more of filter effect
The optical communication system and its communication means of multi output are inputted, which can realize great Rong while realizing illumination functions
Signal transmission is measured, and of simple structure and low cost.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of multiple-input and multiple-output optical communication system based on filter effect, including optical signal launch end and optical signal receive
End:
The optical signal launch end includes light intensity modulator and the optical signal being attached thereto sends array, the optical signal hair
Sending array includes m × n light source, wherein every n distribution of light sources, in a signal sending zone, the optical signal sends array
Share m signal sending zone, the spectrum frequency range of n light source in each signal sending zone can overlap each other but spectrum again
Not exactly the same, the spectrum for adhering to any two light source in unlike signal sending zone separately can be identical, the light intensity modulator
The road m × n signal is modulated respectively on the light carrier emitted to m × n light source, generates corresponding modulated signal light, and not
Different signals is modulated in the same time, and wherein m, n are the integer greater than 1；
The optical signal receiving end includes preposition device, filtering device, detector, and at the signal connecting with detector
Manage unit；The preposition device is located at before filtering device, and preposition device issues the light source in each signal sending zone
Light beam be incident on the different parts on filtering device surface respectively with fixed angle, and other light are filtered out；The filter
Part can enable the incident light of identical frequency same intensity transmit the light intensity of filtering light after the different parts of filtering device not
Together, and the incident light of different frequency same intensity does not transmit the light intensity of filtering light also not after the same area of filtering device
It is identical；The detector is the detection core of array composed by at least m × n optical detection pixel elements that respond with same frequency spectrum
Piece, at least m signal receiving area in array detection chip, at least n light is visited in any signal receiving area
Pixel elements are surveyed, the optical detection pixel elements have response to the signal light being incident on pixel elements photosurface；Optical signal sends array
The signal light that interior unlike signal sending zone is emitted is incident upon in array detection chip respectively after by filtering device
Optical detection pixel elements in unlike signal receiving area；The signal processing unit is to the pixel elements in unlike signal receiving area
The data detected are analyzed and processed respectively, are carried out Data Analysis Services eventually by signal processing unit, are passed through solution
The method of matrix equation or system of linear equations decodes to obtain the signal that optical signal launch end is issued.
Preferably, the preposition device includes preposition beam incident optical component, the first convex lens, the first aperture and second
Convex lens, the light emission that the light source in each signal sending zone is issued is to wherein one be emitted after the preposition beam incident optical component
Shu Guang is parallel to the primary optical axis of the first convex lens and the second convex lens, and the aperture gap setting is in the first convex lens and
At common focus between two convex lenses.
Preferably, the optical signal receiving end further includes light wavelength conversion member, and light wavelength conversion member setting is filtering
Before device or after filtering device, the light wavelength conversion member includes wavelength conversion layer, is wrapped in the wavelength conversion layer
Containing at least one wavelength converting optical material, some or all of described wavelength converting optical material absorption spectrum exceeds the battle array
The investigative range of column detection chip, the emission spectrum of wavelength converting optical material is all in the spy of the array detection chip
It surveys in range；The wavelength converting optical material is that all have the light for absorbing a kind of wavelength, and emit other different wavelengths of light
Characteristic material or these materials combination.
Preferably, the filtering device includes transparent substrates and the filtering membrane array for being attached to transparent substrates surface, institute
The pixel elements and its face for having at least one detection array chip per a piece of filtering film in filtering membrane array are stated, it is any
N filtering film wave band or array where signal light of at least n optical detection pixel elements institute face in signal receiving area
The transmission spectral line of the detecting band of detection chip is different.
Preferably, the filtering film uses microwave dyeing method, gelatin decoration method, one of method system of ink-jet printing
It is standby.
Preferably, optical color polyester film is prepared as filtering film, one of preparation method using microwave dyeing method
It is as follows:
(1) polyester original film is transferred into the stable disperse dyes suspension of water phase, while outstanding using microwave heating
Supernatant liquid is coloured, and heating temperature is 80 DEG C~85 DEG C, and coloration time is between 10 seconds~120 seconds；
(2) polyester film of coloring is washed, until thoroughly washing away the dye dispersant of film surface, water lotion is
The surfactant for being 0.1%~5% containing mass ratio；
(3) the pigmented polyester film after washing being cleaned again with solvent, solvent is low-boiling organic solvent, than
Preferable cleaning solvent includes that ethyl alcohol, acetone or acetic acid second are cruel, it is contemplated that toxic side effect and cleaning effect select ethyl alcohol most
It is good；
(4) the pigmented polyester film after solvent is washed is dried, 130 DEG C~170 DEG C of drying temperature, drying time exists
Between 10 seconds~120 seconds.
Preferably, each signal sending zone at the optical signal launch end includes the identical light source of n emission spectrum, often
A light source posts the transmission mutually different filtering film of wave spectrum respectively.
Preferably, when the light source needs to make lighting use, using visible light wave range white light source, and work as the light source
When not needing to make lighting use, the infrared band light source in.
Preferably, optical signal receiving end further includes the collimating element before being set to detector, and collimating element can enable edge
The light that is transmitted from filtering device to detector line direction pass through, and the light transmitted along other directions is filtered out, and can be with
Make the signal light that unlike signal sending zone is emitted in optical signal transmission array after by filtering device, is incident upon respectively
Optical detection pixel elements in detector unlike signal receiving area.
Preferably, the collimating element includes third convex lens, second orifice diaphragm and the 4th convex lens, and described second is small
Hole diaphragm gap setting is at the common focus between third convex lens and the 4th convex lens, the third convex lens and the 4th convex
The key light overlapping of axles of lens.
The communication signal of optical communication system described in any one technical solution as described above is sent and coding/decoding method, including following
Step:
Step 1: assuming that certain t moment is modulated hair to n light source in m signal sending zone by light intensity modulator
Signal S ' out1,S’2,…S’m×n, wherein m, n are integer, and the signal of transmitting is distinguished with the intensity size of light；
Step 2: assuming that the letter modulated through light intensity modulator that wherein n light source is emitted in k-th of signal sending zone
Number be S '1,S’2... S ', wherein k is 1 to integer between m；
Step 3: detector receives the issued light in optical signal launch end, wherein the signal that k-th of signal sending zone is sent out
Light passes through signal transmission space, then in optical signal receiving end successively through the front device, filtering device；Or successively through described
Front device, filtering device, light wavelength conversion member；Or successively through the front device, light wavelength conversion member, filter
Part；Or successively through the front device, filtering device, light wavelength conversion member, collimating element；Or successively through the preposition dress
It sets, light wavelength conversion member, filtering device, collimating element；Or successively through the front device, filtering device, collimating element, most
It is radiated in the optical detection pixel elements in signal receiving area corresponding to the signal sending zone eventually, if believing in t moment step 2
Light intensity received by least n optical detection pixel elements in signal receiving area corresponding to number sending zone is respectively I1,
I2,…In,…；
Step 4: by each optical detection pixel elements institute in signal receiving area corresponding to the signal sending zone in step 3
The light intensity received is removed respectively in each row unit for the augmented matrix for being updated to matrix equation after noise, and the signal is sent
Light source is lit with this by the value that above-mentioned each optical detection pixel elements are detected under each independent ignition condition of light source in region
The ratio that emissive porwer removes the two after noise respectively is updated to respectively in each unit of each row of coefficient matrix of matrix equation,
Since the coefficient matrix each unit data can be measured in advance by experiment, solves this matrix equation and obtain signal S1,
S2,…Sn；
Step 5: taking S1,S2,…SnThe average value of this n value is as decision threshold, by S1,S2,…SnWith decision threshold into
Row compares, and is set as " 1 " greater than the value, is set as " 0 " less than the value, can obtain t moment optical signal launch in optical signal receiving end
Hold the actual signal S ' of n light source transmission in wherein some signal sending zone1,S’2,…S’n；
Step 6: respectively by optical detection picture in each signal receiving area corresponding to signal each in step 1 sending zone
Primitive element institute's measured data substitutes into each matrix equation, and respectively repeats steps 2-5, can be believed by solving m matrix equation in light
Number receiving end receives signal S '1,S’2,…S’m×n；
Step 7: different signals being modulated in different moments by light intensity modulator, can be received in optical signal receiving end
The signal issued to optical signal launch end different moments.
Preferably, matrix equation can pass through convex optimized algorithm, Tikhonov regularization algorithm, L1 model in the step 4
Number regularization algorithms, genetic algorithm, crisscross multiplier method, the one of which in simulated annealing are solved, and can also be adopted
The bit error rate of signal is reduced with other known or unknown Mathematics Optimization Method solution matrix equation.
Compared with prior art, the invention has the following advantages:
1, the transmission of large capacity signal can be realized while lighting.Optical signal transmitting terminal of the present invention is had using a series of
The light source of certain frequency range, it is higher to human eye comfort level compared with the visible waveband light source of single-frequency, and due to light source
Spectrum frequency range can be overlapped, therefore the quantity of light source is not limited by visible light and infrared band total bandwidth.
2, the device architecture of the signal transmitting terminal and signal receiving end of system is simple, is easily achieved.The present invention is not required to volume
Larger, complicated multiplexing has mature product with demultiplexing optical device, light source and array detection chip, is rationally set
Meter transmits optical signal by shared channel, the transmission of the optical communication system by measuring multiple-input and multiple-output in advance
Matrix, so that the acquisition of solution matrix equation renews transmitting signal.
3, the present invention combines frequency division multiplexing with space division multiplexing technology, therefore can reduce system cost to the maximum extent
And improve channel capacity.With the light source of different spectrum in each signal sending zone, through transmission load on different light sources
Signal, the optical detection pixel elements at signal receiving end different location can measure different filtering light intensity signals, therefore can be with
Original transmitted signal is obtained by the method for dematrix equation, at the same time, adheres to any two in unlike signal sending zone separately
Its spectrum of a light source can be identical, therefore system cost is relatively low.And multiple signals light emits simultaneously, improves message capacity.
4, when not needing the system as lighting use, signal communication can also be carried out using infrared band light source, kept away
The defect that traditional visible light communication system must be illuminated in communication is exempted from, especially when the signal receiving end of system uses
It can overcome the arrays detection chips such as common silicon substrate CCD or CMOS that can not detect infrared band light when light wavelength conversion member
The shortcomings that.Therefore, which can both detect visible light signal using common silicon substrate CCD or detect infrared band light letter
Number, to further reduced the cost of building system while improving system performance.
5, filtering device cost of manufacture needed for the communication system is cheap, is conducive to realize batch production.
Detailed description of the invention
Fig. 1 is that the present invention is based on the principle schematic diagrams of the multiple-input and multiple-output optical communication system of filter effect；
Fig. 2 is the filtering film distributing position schematic diagram at the different filtering positions of the present invention；
Fig. 3 is that the structural schematic diagram after light wavelength conversion member and collimating element is added in the present invention in Fig. 1 structure basis；
Fig. 4 is the curve of spectrum of 9 kinds of different light sources used in some signal sending zone in the embodiment of the present invention.
Fig. 5 filters the transmission spectral lines of films for 16 kinds of differences of some signal receiving area institute face in the embodiment of the present invention.
Each label meaning is as follows in figure:
1 sends first signal sending zone in array for optical signal, and 2 send second signal hair in array for optical signal
Region is sent, 3 send third signal sending zone in array for optical signal, and 4 send the 4th signal hair in array for optical signal
Region is sent, 5 send m-th of signal sending zone in array for optical signal, and 6 be first filtering position in filtering device, and 7 be filter
Second filtering position in wave device, 8 filter position for third in filtering device, and 9 be the 4th filtering part in filtering device
Position, 10 be m-th of filtering position in filtering device, and 11 be first signal receiving area in array detection chip, and 12 be battle array
Second signal receiving area in column detection chip, 13 be third signal receiving area in array detection chip, and 14 are
4th signal receiving area in array detection chip, 15 be m-th of signal receiving area in array detection chip, and 16 are
Light intensity modulator, 17 send array for optical signal, and 18 be the signal light transmitted in signal transmission space, and 19 be the first convex lens,
20 be the second convex lens, and 21 be third convex lens, and 22 be the 4th convex lens, and 23 be aperture, and 24 be second orifice diaphragm, 25
It is light wavelength conversion member for detector, 26,27 send some signal sending zone in array for optical signal, and 28 send out for optical signal
End is penetrated, 29 be optical signal receiving end, and 30 be preposition device, and 31 be collimating element, and 32 be filtering device, and 33 be preposition beam incident optical
Component, 34 be filtering film.
Specific embodiment
The present invention using be easily obtained, low-cost LED light source composition optical signal send array 17 carry out multichannel letter
Number parallel transmission, and combine dematrix equation or linear equation using filtering device 32 and detector 25 (such as CCD, CMOS)
The method of group restores the multiple signals transmitted out.Light source of the present invention can be used to communicate and illuminate simultaneously, can also
Only to realize any one of them function.It will be illustrated and explained below by the non-limitative illustration of preferred embodiment.These
Embodiment is only the prominent example using technical solution of the present invention, all technologies taking equivalent replacement or equivalent transformation and being formed
Scheme is all fallen within the scope of protection of present invention.
Fig. 1 shows one of structure of the multiple-input and multiple-output optical communication system the present invention is based on filter effect.Such as
Shown in Fig. 1, a kind of multiple-input and multiple-output optical communication system based on filter effect, including optical signal launch end and optical signal are received
End.The optical signal launch end 28 includes that light intensity modulator 16 and the optical signal being attached thereto send array 17.The optical signal
Sending array includes m × n light source, and m, n are the integer greater than 1, and the value range of m, n can be thousands of.Optical signal is sent
In a signal sending zone 27, which can be m signal and sends every n distribution of light sources in array 17
First signal sending zone 1 in region is also possible to second signal sending zone 2 or third signal sending zone 3
Or the 4th signal sending zone 4 ... or m-th of signal sending zone 5.The spectrum of n light source in each signal sending zone
Frequency range can overlap each other but spectrum is again not exactly the same, adhere to the spectrum of any two light source in unlike signal sending zone separately
It can be identical.Light intensity modulator 16 modulates the road m × n signal on the light carrier emitted to m × n light source respectively, generates phase
The light modulating signal answered.M × n light source at a time sends the road m × n optical signal respectively, and each light source is sent wherein all the way
Signal.Also, different signals is modulated in different moments light intensity modulator.The signal light 18 that these signals are modulated passes through
" signal transmission space " transmission, is finally received by optical signal receiving end 29.The signal transmission space is in the present embodiment
Air, be also possible to water, silica or other can transmit the medium of light.
The optical signal receiving end 29 includes preposition device 30, filtering device 32, detector 25, and is connected with detector 25
The signal processing unit (not shown in figure 1) connect, the preposition device 30 are located at before filtering device 32, it can make each letter
The wherein light beam that light source in number sending zone is issued is incident on the difference on 32 surface of filtering device with fixed angle respectively
Position, and other light are filtered out.In the technical scheme, the range of the fixed angle is -90 °~90 °.The filtering device 32
The incident light of identical frequency same intensity can be enabled to transmit the light intensity of filtering light after the different parts of filtering device 32 not
Together, and the incident light of different frequency same intensity transmits the light intensity for filtering light after the same area of filtering device 32
It is not identical.The detector 25 is that array composed by at least m × n optical detection pixel elements that respond with same frequency spectrum is visited
Survey chip.The CCD or CMOS of silicon substrate can be used in detector 25, and CCD is charge-coupled device, and CMOS complementary metal oxide is partly led
Body, detector uses CCD in the present embodiment.Each pixel elements spectral response characteristic having the same of the CCD, i.e., identical wave
When long, same intensity light is incident on these pixel elements, the data of each pixel elements output are identical.The photosensitive area of CCD is divided into m
A signal receiving area, i.e. first signal receiving area 11, second signal receiving area 12, third signal receiving area
13, the 4th m-th of signal receiving area 14 ... signal receiving area 15, at least p light is visited in either signal receiving area
It surveys pixel elements (p >=n, p are integer, and the value range of p can be thousands of), optical detection pixel elements are to being incident on optical detection pixel
Signal light on first photosurface has response.Signal processing unit is connected with detector 25, it connects 25 unlike signal of detector
The data that the pixel elements in region are detected are received to be analyzed and processed respectively.I.e. by by the picture in unlike signal receiving area
Primitive element data are updated to different matrix equations and solution matrix equation, and final decoding obtains the letter that optical signal launch end is issued
Number.
In the technical scheme, 30 preferred device structure of preposition device includes preposition beam incident optical component 33, first
Convex lens 19, the first aperture 23, the second convex lens 20, the light emission that the light source in each signal sending zone is issued is to described
The wherein light beam being emitted after preposition beam incident optical component 33 is parallel to the primary optical axis of the first convex lens 19 and the second convex lens 20,
The first aperture gap setting is at the common focus between the first convex lens 19 and the second convex lens 20, and described first
The key light overlapping of axles of convex lens and the second convex lens.The preposition beam incident optical component 33 can also be connected using object lens of large relative aperture
Continuous zoom pre-objective, tunable reflection microscope group, zooming liquid lens group, concavees lens, MEMS micromirror, automatic focusing liquid crystal lens
All existing or optical devices having or combinations thereof such as group so that the light emission that is issued of the light source in each signal sending zone to
The wherein light beam being emitted after the preposition beam incident optical component 33 is parallel to the master of the first convex lens 19 and the second convex lens 20
Optical axis.If using concave lens as preposition beam incident optical component 33, directive concave lens everywhere in light spectrum image-forming region to be measured
The light of focus will be reflected into directional light after concavees lens, which is parallel to the key light of the first convex lens and the second convex lens
Axis.Preferably, the preposition beam incident optical component 33 can also by adjust in preposition beam incident optical component lens or
The modes such as the focal length of reflecting mirror change the field angle of optical signal receiving end, so that although point of optical signal launch end inner light source
Cloth range is larger, and the wherein light beam that the light source in each signal sending zone is issued can be with fixation after preposition device
Angle is incident on the different parts on filtering device surface respectively.The preposition device 30 can be also other structures, in this technology side
The specific structure of the preposition device is not limited in case, as long as the light source in each signal sending zone is enabled to be issued
Wherein light beam is incident on the different parts on filtering device surface respectively with fixed angle, and other light are filtered out.
In preferred embodiment, the structure that filtering device uses is the filtering membrane array attached in a transparent substrates, and Fig. 2 is
The filtering film distributing position schematic diagram at difference filtering position.There is at least one institute per a piece of filtering film 34 in filtering membrane array
State the pixel elements and its face of detection array chip.At least p light is assumed in either signal receiving area in CCD photosurface
Detected pixel member, wherein p filtering film 34 of p optical detection pixel elements institute face wave band or array detection where signal light
The transmission spectral line of the detecting band of chip is different.
The smooth light absorping film in surface or Anti-reflective coating or anti-reflection film can be used in filtering film in the filtering membrane array.Light is inhaled
Winder is filtered using the principle of light absorption.When light absorption is that light passes through material, interact with material, the energy of light
It is partly converted into the physical process of other form of energy.Anti-reflective coating or the principle of anti-reflection film are to filter the front surface of film with after
Constructive interference or destructive interference occur for certain wavelength of surface reflection or the light of frequency.Regardless of why not together their principle has, he
Can make incident light through filtering film after, the curve of spectrum of transmitted light changes.
Microwave dyeing method, gelatin decoration method, the preparation of one of method of ink-jet printing can be used in the filtering film.This reality
It applies in example, optical color polyester film is prepared as filtering film using microwave dyeing method, preparation method is as follows:
(1) polyester original film is transferred into the stable disperse dyes suspension of water phase, while outstanding using microwave heating
Supernatant liquid is coloured, and heating temperature is 80 DEG C~85 DEG C, and coloration time is between 10 seconds~120 seconds；
(2) polyester film of coloring is washed, until thoroughly washing away the dye dispersant of film surface, water lotion is
The surfactant for being 0.1%~5% containing mass ratio；
(3) the pigmented polyester film after washing being cleaned again with solvent, solvent is low-boiling organic solvent, than
Preferable cleaning solvent includes that ethyl alcohol, acetone or acetic acid second are cruel, it is contemplated that toxic side effect and cleaning effect select ethyl alcohol most
It is good；
(4) the pigmented polyester film after solvent is washed is dried, 130 DEG C~170 DEG C of drying temperature, drying time exists
Between 10 seconds~120 seconds.
Light wavelength conversion member 26 can be also arranged in the present invention before or after filtering device 32, and the optical wavelength turns
Changing component 26 includes wavelength conversion layer, includes at least one wavelength converting optical material in the wavelength conversion layer；The wavelength
Some or all of switchable optical material absorption spectrum exceeds the investigative range of the detector 25 (such as CCD), and emission spectrum is complete
Portion is in the investigative range of the detector 25.In order to guarantee the optical detection pixel elements in detector 25 to being incident on pixel elements sense
Signal light in smooth surface has response, and the frequency range that each light source in the optical signal launch end 28 goes out luminous spectrum must be
The investigative range of optical signal receiving end 29.The definition of the investigative range of optical signal receiving end 29 is: from light wavelength conversion member 26
Frequency is selected in the frequency range that the absorption spectrum and detector 25 for all wavelengths switchable optical material for being included can detect
Rate maximum value and frequency minima, the frequency range between the maximum frequency and frequency minima are that the optical signal connects
The investigative range of receiving end.The wavelength conversion material is that all have a kind of characteristic for the light emitting another kind wavelength for absorbing wavelength
Material or these materials combination.For example wavelength conversion material can be using up-conversion luminescent material or the luminous material of lower conversion
Material.Explained later once up-conversion luminescent material and down-conversion luminescent material: Stokes' law thinks that certain materials can be by
Light to high-energy excites, and issues the light of low energy, in other words, as wavelength it is short frequency it is high inspire the long frequency of wavelength
The low light of rate, such as ultraviolet light excite the material that can issue visible light, and such material is exactly down-conversion luminescent material.Phase
Instead, the illumination effect exactly the opposite with above-mentioned law may be implemented in some materials, and then we are called anti-Stokes luminescence,
Also known as up-conversion luminescence, such material are known as up-conversion luminescent material.
Light wavelength conversion member 26 of the present invention can make this patent before or after being set to filtering device
The means of communication are used for the optical communication of non-visible light frequency range, to overcome the visible optical communication of tradition that must carry out using visible light
The defect of illumination.But in view of the emission spectrum of most existing wavelength convert luminescent materials is relatively narrow, in order to enable light is by filtering
After device 32, light distribution difference of the light of different frequency on the surface formation formula detection chip (such as CCD) is more significant, i.e., by not
It is larger with obtained light intensity difference after filtering membrane filtration wave, to be conducive to receive by the method for solution matrix equation in signal
End is restored emits signal out, after light wavelength conversion member 26 is preferably set to filtering device 32 by the present invention, that is, is located at filtering
Between device 32 and array detection chip.The each filtered beam transmitted from filtering device 32 passes through a light wavelength conversion
After component, then pass through first pixel elements area that second the first preposition device 31 of optics is mapped to array detection chip thereafter respectively
Domain 11, second pixel member region 12,13, the 4th m-th of the pixel elements regions 14 ... in third pixel elements region pixel elements area
Domain 15.
Wavelength converting optical material in the present invention can be used it is existing or by have it is various it is upper conversion or lower transition material, only
Meet the investigative range that some or all of conversion or lower transition material absorption spectrum exceeds the array detection chip,
And emission spectrum then can effectively extend the signal of light communication system all in the investigative range of the array detection chip
The wavelength detection range of receiving end.Such as using infrared display in the model HCP-IR-1201 of color scientific and technological (HCP) production of dragon
Card, infrared display card is made using up-conversion luminescent material in this, and the Infrared irradiation of 0.3mW can inspire visible light, is had
Light excitation wave band is imitated mainly in 700nm~10600nm, luminous intensity and the proportional relation with increase of exciting power.If array
Detection chip uses the CCD chip of model SONY-ICX285AL, its detecting band is about 400nm~1000nm, so
Using infrared display card among the above as light wavelength conversion member, the wavelength of the signal receiving end of the light communication system may make to visit
Range extension is surveyed about to 400nm~10600nm, the wavelength detection range than silicon substrate CCD itself is wider.
Also a kind of 3 (H2MFDA=9,9- of lower switchable optical material (MOF) Eu3 (MFDA) 4 (NO3) (DMF) can be used
dimethylfluorene-2,7-dicarboxylic acid)[Xinhui Zhou et al,A microporous
luminescent europium metal–organic framework for nitro explosive sensing,
Dalton Trans., 2013,42,5718-5723], absorption spectrum ranges are about in 250nm~450nm, emission spectrum
Range is about in 590nm~640nm, if array detection chip uses the CCD chip of model SONY-ICX285AL,
Its detecting band is about 400nm~1000nm, so using light wavelength conversion portion made of above-mentioned lower switchable optical material
Part may make the wavelength detection range of the signal receiving end of the light communication system to extend about to 250nm~1000nm, compare silicon substrate
The detection wave-length coverage of CCD itself is wider.
Light wavelength conversion member is not required device in the present invention, when the optical signal receiving end of the light communication system is not adopted
When with light wavelength conversion device, the wavelength detection range of the optical signal receiving end of the light communication system is used array
The wavelength response range of detection chip.The letter of the light communication system is expanded using the purpose of light wavelength conversion member
The wavelength detection range of detector at number receiving end, but without light wavelength conversion member and by selecting suitable light source and detection
Device can similarly carry out signal communication.It is using the purpose of light wavelength conversion member: firstly, optical signal launch end and detector
Existing, common light source and array detection chip can be used, purchase special light sources and array can be thus saved
The cost of detection chip, and do not have to ensure that the wavelength detection range of array detection chip must include the launch wavelength of light source；
Secondly, can both detect visible light using the same array detection chip can also detect the light of non-visible light wave band,
It thus can make the communication system that can not only visible light be used to be communicated as carrier, can also use non-visible light as carrier
It is communicated, carrier can be communicated with both the above using same set of signal receiving end in this way and communicated, it is ensured that be not required to
It can also be communicated in the case of being illuminated using visible light.
When above-mentioned filtering device or light wavelength conversion member surface irregularity, scattering light may be generated, so that some
The light emission that the filtering film of pixel elements institute face is transmitted in signal receiving area is to the pixel in adjacent signal receiving area
In member.In order to avoid the crosstalk between channel, signal receiving end further includes being set between filtering device 32 and detector 25
Collimating element 31, collimating element 31 can be enabled to be passed through along the light transmitted from filtering device to detector line direction, and by edge
The light of other direction transmission filters out, and optical signal can be made to send the signal light that unlike signal sending zone is emitted in array
In the optical detection pixel elements by being incident upon in detector unlike signal receiving area respectively after filtering device.The collimator
One of structure of part includes third convex lens 21, second orifice diaphragm 24, the 4th convex lens 22, the second orifice diaphragm
24 gap settings are at the common focus between third convex lens 21 and the 4th convex lens 22, the third convex lens 21 and the 4th
The key light overlapping of axles of convex lens 22.The collimating element 31 can be also other structures, in the technical scheme not to the specific of this
Structure limits.Fig. 3 institute diagram is that have light wavelength conversion member and one of light communication system of the present invention of collimating element
Structure chart.
The communication process of communication system as shown in Figure 3 is summarized below: optical signal sends array 17 in light intensity modulator
Under the action of 16, by each signal sending zone (first signal sending zone 1, second signal sending zone 2, third
Signal sending zone 3, the 4th signal sending zone 4 ... m-th of signal sending zone 5) issue signal beams, these light beams
By being projected to each position in 32 surface of filtering device after preposition device 30 respectively, filtering device 32, which can enable between incident light, to be occurred
Filter effect, each filtered beam transmitted from filtering device 32 is after a light wavelength conversion member 26, then passes through standard
The signal receiving area of first signal receiving area 11, second of array detection chip thereafter is mapped to after straight device 31 respectively
12, third signal receiving area 13, the 4th m-th of signal receiving area 14 ... signal receiving area 15, then by above each
Each pixel elements in signal receiving area are detected, and last signal processing unit carries out data point to each pixel elements institute's measured data
Analysis and processing.
Detailed description are as follows for optical communication system signal transmission and signal decoding method of the one of the above based on filter effect:
Step 1: assuming that certain t moment is modulated hair to n light source in m signal sending zone by light intensity modulator
Signal S ' out1,S’2,…S’m×n, wherein m, n are integer, and the signal of transmitting is distinguished with the intensity size of light, such as: " light
Source shines or the big Mr. Yu's threshold value of luminous intensity " representation signal " 1 ", " light source does not shine or the small Mr. Yu's threshold value of luminous intensity " representation signal
"0"；
Step 2: assuming that the letter modulated through light intensity modulator that wherein n light source is emitted in k-th of signal sending zone
Number be S '1,S’2,…S’n, the above k is 1 to integer between m；
Step 3: detector receives the issued light in optical signal launch end, wherein the signal that k-th of signal sending zone is sent out
Light passes through signal transmission space, then in signal receiving end successively through the preposition device, filtering device and light wavelength conversion portion
Part, collimator apparatus, eventually impinge in the optical detection pixel elements in signal receiving area corresponding to the signal sending zone (more than
Light wavelength conversion member and collimator apparatus in signal receiving end can be omitted), if corresponding to k-th of signal sending zone of t moment
Signal receiving area in p optical detection pixel elements received by light intensity be respectively I1,I2,…Ip, wherein p >=n, p are whole
Number, the value range of p can be thousands of；
In order to which signal receiving area corresponding to signal sending zone is described in detail, as shown in Figure 1, first signal is sent
The signal light that region 1 is issued eventually impinges the of array detection chip by first filtering position 6 of filtering device
One signal receiving area 11, therefore the corresponding first signal receiving area 11 in first signal sending zone 1；Second signal
The signal light that sending zone 2 is issued eventually impinges array detection chip by second filtering position 7 of filtering device
Second signal receiving area 12, therefore the corresponding second signal receiving area 12 in second signal sending zone 2；Third
The signal light that signal sending zone 3 is issued filters position 8 by the third of filtering device, eventually impinges array detection
The third signal receiving area 13 of chip, therefore the corresponding third signal receiving area 13 in third signal sending zone 3；The
The signal light that four signal sending zones 4 are issued eventually impinges array by the 4th filtering position 9 of filtering device
4th signal receiving area 14 of detection chip, therefore the corresponding 4th signal receiving area in the 4th signal sending zone 4
14；And so on, the signal light that m-th of signal sending zone 5 is issued, by m-th of filtering position 10 of filtering device, most
It is mapped to m-th of signal receiving area 15 of array detection chip, therefore corresponding m-th of the signal in m-th of signal sending zone 5 eventually
Receiving area 15.Using the optical signal launch end and optical signal receiving end, optical signal sends array either signal sending zone
Light can only project in one of signal receiving area of its corresponding detector, without project other signals receive
Region.
Step 4: each optical detection pixel elements in signal receiving area corresponding to k-th of signal sending zone are received
To light intensity remove the augmented matrix for being updated to matrix equation after noise respectively each row unit in, and by the signal sending zone
It is lit the transmitting of light source under the interior independent ignition condition of each light source with this by value that above-mentioned each optical detection pixel elements are detected
The ratio that intensity removes the two after noise respectively is updated to respectively in each unit of each row of coefficient matrix of matrix equation, due to
The coefficient matrix each unit data can be measured in advance by experiment, therefore pass through solution matrix equation (or system of linear equations)
Method obtains signal S1,S2,…Sn；
In order to which the solution procedure of the matrix equation is described in detail, it is assumed that letter corresponding to k-th of signal sending zone of t moment
Having light intensity received by p optical detection pixel elements (p > n, wherein p is integer) in number receiving area is respectively I1,I2,…Ip,
It is moved back by convex optimized algorithm, Tikhonov regularization algorithm, L1 norm regularization, genetic algorithm, crisscross multiplier method, simulation
The one of which of the optimization algorithms such as fiery algorithm or their improved method solve following matrix equation and obtain S1,S2,…Sn。
WhereinFor transmission square
Battle array.
One of element H in formula, in channel transfer matrices Hij(i=1,2 ... p) (j=1,2 ... n) indicates k-th of letter
Transmission space of the optical signal that j-th of light source is emitted in number sending zone Jing Guo MIMO optical communication system, by i-th in CCD
Transmission coefficient received by pixel elements, the i.e. optical signal that j-th of light source individually issues in k-th of signal sending zone pass through
After MIMO optical communication system subtracts ambient noise by the intensity that ith pixel member detects in CCD and the light source emission intensity
Ratio.For a certain specific MIMO optical communication system, channel transfer matrices H is uniquely determined, in channel transfer matrices
Each element, that is, transmission coefficient be that can first pass through in advance experiment to obtain, above-mentioned matrix equation can be updated to.
Step 5: taking S1,S2,…SnThe average value of this n value is as decision threshold, by S1,S2,…SnWith decision threshold into
Row compares, and is set as " 1 " greater than the value, is set as " 0 " less than the value, can obtain t moment optical signal launch in optical signal receiving end
Hold the actual signal S ' of n light source transmission in wherein k-th of signal sending zone1,S’2,…S’n；
Step 6: by the way that k is got always m from 1, i.e., respectively being surveyed optical detection pixel elements in each signal receiving area
Data are substituted into respectively in each matrix equation, and respectively repeat steps 2-5, can be connect by solving m matrix equation in optical signal
Receiving end receives signal S '1,S’2,…S’m×n；
Step 7: different signals being modulated in different moments by light intensity modulator, can be received in optical signal receiving end
The signal issued to optical signal launch end different moments.
By principles above and step it is found that the communication system peak signal transmission rate is limited by the array detection chip
Frame per second, the response rate of light source, the modulation rate of light intensity modulator, the sum of optical signal launch end light source etc..In general, it improves
Although the working transmission in the unit time can be improved in signal transmission rate, but the bit error rate can also improve.
Optical communication system of the invention does not need multiplexing and demultiplexing optical device using complex and expensive, and light source therein can
Using the most common LED light source, and if necessary to the light source with different emission spectrum, in addition to using different size model
Outside LED light source, different filtering film or filtering cover can also be sticked at identical LED light source rear；The knot of filtering device
Structure is simple, various informative, and the technique preparation of existing simple maturation can be used more；Photodetector array can directly adopt mature
CCD or cmos device.Therefore, the cost of implementation of MIMO optical communication system of the present invention is lower.
Different from traditional wavelength-division multiplex or frequency division multiplexing light communication system, broadband light can be used in the light source in the present invention
Source, the spectrum for the light source for adhering to unlike signal sending zone separately in signal sending end do not need different, the same signal hair
Sending the spectrum frequency range of the light source in region can also overlap each other.For example the signal sending end moment needs 72 road of simultaneous transmission to believe
Number, m=8, n=9 can be taken, 8 signal sending zones is shared at this time, there are 9 LED in each signal sending zone, pass through light
72 road signals are loaded on 72 LED light sources by strong modulator respectively.And the spectrum of this 72 LED light sources does not need completely not
Together, it is possible to use only 9 kinds of light sources (curve of spectrum is as shown in Fig. 4) with the different curves of spectrum form a signal and send area
Domain, and other signal sending zones use identical 9 kinds of light sources.Also, there are different spectrum in the same signal sending zone
9 light sources of curve can also be by adopting other than using the LED light source of different size model (having the different curves of spectrum)
Stick on different filtering film or filtering cover acquisition with 9 kinds of LED light sources of same model (with same spectra curve) and behind.
The method for sticking on different filtering film or filtering cover can equally obtain 9 kinds of different emission spectrum.
By taking the LED light source using 9 kinds of different models as an example.Abscissa is wavelength in attached drawing 4, and ordinate is normalization spectrum
Power, each curve in figure represent the curve of spectrum of different LED light sources.This 9 kinds of LED light sources send area in the same signal
Domain, and other signals sending zone uses same 9 kinds of LED light sources, a total of 8 signal sending zones, therefore just by this 9 kinds
LED light source is divided into 8 groups, sends 72 road signals simultaneously by this 72 LED light source LED light source consisting arrays.The CCD of signal receiving end
There are million pixel elements on array, these pixel elements are divided into 8 signal detection regions, each signal detection region face
Filtering device in have 16 filtering films.As shown in figure 5,16 in the filtering device of one of signal detection region face
A filtering film is different in the transmission spectral line of LED emission band or CCD detection wave band.However, unlike signal search coverage is just
Pair filtering device in filtering film the transmission spectral line of LED emission band or CCD detection wave band can be identical.Each signal is visited
Survey all at least 16 pixel elements filtering film faces different from 16 in region.Therefore, in one of signal sending zone
The signal light sent out of 9 kinds of LED simultaneously after 16 different filtering films, respectively by face in some signal detection region
16 pixel elements are received, in the augmented matrix for the matrix equation that 16 pixel elements the data obtaineds are updated in above-mentioned steps 4,
And solve the matrix equation.Finally, by receiving each pixel elements institute measured data in 8 signal detection regions, 8 matrix sides are solved
Journey obtains the solving result of 8 matrix equations, so that it may which decoding obtains 8 signal sending zone institutes of the time-ofday signals transmitting terminal
The data of transmission.
Still there are many embodiment, all technical sides formed using equivalents or equivalent transformation by the present invention
Case is within the scope of the present invention.
Claims (10)
1. a kind of multiple-input and multiple-output optical communication system based on filter effect, including optical signal launch end and optical signal receive
End, it is characterised in that:
The optical signal launch end includes light intensity modulator and the optical signal being attached thereto sends array, and the optical signal sends battle array
Column include m × n light source, wherein every n distribution of light sources, in a signal sending zone, it is shared that the optical signal sends array
The spectrum frequency range of m signal sending zone, n light source in each signal sending zone can overlap each other but spectrum is again endless
Exactly the same, the spectrum for adhering to any two light source in unlike signal sending zone separately can be identical, the light intensity modulator by m ×
The road n signal is modulated respectively on the light carrier emitted to m × n light source, generates corresponding modulated signal light, and in different moments
Different signals is modulated, wherein m, n are the integer greater than 1；
The optical signal receiving end includes preposition device, filtering device, detector, and the signal processing list connecting with detector
Member；The preposition device is located at before filtering device, and preposition device makes one that the light source in each signal sending zone is issued
Shu Guang is incident on the different parts on filtering device surface with fixed angle respectively, and other light are filtered out；The filtering device can
The light intensity for enabling the incident light of identical frequency same intensity transmit filtering light after the different parts of filtering device is different, and
The light intensity that the incident light of different frequency same intensity transmits filtering light after the same area of filtering device is not also identical；
The detector is array detection chip composed by at least m × n optical detection pixel elements that respond with same frequency spectrum, battle array
At least m signal receiving area in column detection chip, at least n optical detection pixel in any signal receiving area
Member, the optical detection pixel elements have response to the signal light being incident on pixel elements photosurface；Optical signal sends different in array
The signal light that signal sending zone is emitted is incident upon in array detection chip different letters after by filtering device respectively
Optical detection pixel elements in number receiving area；The signal processing unit detects the pixel elements in unlike signal receiving area
To data be analyzed and processed respectively, eventually by signal processing unit carry out Data Analysis Services, by solution matrix side
Journey or the method for system of linear equations decode to obtain the signal that optical signal launch end is issued.
2. a kind of multiple-input and multiple-output optical communication system based on filter effect according to claim 1, it is characterised in that:
The preposition device includes preposition beam incident optical component, the first convex lens, the first aperture and the second convex lens, each signal hair
The light emission for sending the light source in region to be issued is parallel to first to the wherein light beam being emitted after the preposition beam incident optical component
The primary optical axis of convex lens and the second convex lens, the aperture gap setting is between the first convex lens and the second convex lens
At common focus.
3. a kind of multiple-input and multiple-output optical communication system based on filter effect according to claim 1, it is characterised in that:
The optical signal receiving end further includes light wavelength conversion member, and light wavelength conversion member is arranged before filtering device or filters
After device, the light wavelength conversion member includes wavelength conversion layer, is turned in the wavelength conversion layer comprising at least one wavelength
Optical material is changed, some or all of described wavelength converting optical material absorption spectrum exceeds the spy of the array detection chip
Range is surveyed, the emission spectrum of wavelength converting optical material is all in the investigative range of the array detection chip；The wave
Long switchable optical material has the light for absorbing a kind of wavelength for all, and emits the material of the characteristic of other different wavelengths of light, or
The combination of these materials.
4. a kind of multiple-input and multiple-output optical communication system based on filter effect according to claim 1, it is characterised in that:
The filtering device includes transparent substrates and the filtering membrane array for being attached to transparent substrates surface, in the filtering membrane array
Per a piece of pixel elements and its face for filtering film and having at least one detection array chip, in either signal receiving area extremely
N filtering film wave band or probing wave of array detection chip where signal light of rare n optical detection pixel elements institute face
The transmission spectral line of section is different.
5. a kind of multiple-input and multiple-output optical communication system based on filter effect according to claim 4, it is characterised in that:
The filtering film is using microwave dyeing method, gelatin decoration method, the preparation of one of method of ink-jet printing；Using microwave dyeing
Method prepare optical color polyester film production filtering film the preparation method is as follows:
(1) polyester original film is transferred into the stable disperse dyes suspension of water phase, while utilizes microwave heating suspension
It is coloured, heating temperature is 80 DEG C~85 DEG C, and coloration time is between 10 seconds~120 seconds；
(2) polyester film of coloring is washed, until thoroughly wash away the dye dispersant of film surface, water lotion be containing
The surfactant that mass ratio is 0.1%~5%；
(3) the pigmented polyester film after washing is cleaned again with solvent, solvent is low-boiling organic solvent, relatively good
Cleaning solvent include that ethyl alcohol, acetone or acetic acid second are cruel, it is contemplated that toxic side effect and cleaning effect, select ethyl alcohol it is best；
(4) the pigmented polyester film after solvent is washed is dried, 130 DEG C~170 DEG C of drying temperature, drying time was at 10 seconds
Between~120 seconds.
6. a kind of multiple-input and multiple-output optical communication system based on filter effect according to claim 1, it is characterised in that:
When the light source needs to make lighting use, using visible light wave range white light source, and when the light source does not need to be used as illumination
When way, the infrared band light source in.
7. a kind of multiple-input and multiple-output optical communication system based on filter effect according to claim 1 or 3, feature exist
It further include the collimating element before being set to detector in: the optical signal receiving end, collimating element can be enabled along from filtering
Device passes through to the light that detector line direction is transmitted, and the light transmitted along other directions is filtered out, and can make optical signal
The signal light that unlike signal sending zone is emitted in transmission array is incident upon detector not after by filtering device respectively
With the optical detection pixel elements in signal receiving area.
8. a kind of multiple-input and multiple-output optical communication system based on filter effect according to claim 7, it is characterised in that:
The collimating element includes third convex lens, second orifice diaphragm and the 4th convex lens, the second orifice diaphragm gap setting
At common focus between third convex lens and the 4th convex lens, the primary optical axis weight of the third convex lens and the 4th convex lens
It closes.
9. the communication signal of optical communication system described in any one claim is sent as described above and coding/decoding method, feature exist
In: the following steps are included:
Step 1: assuming that certain t moment is modulated sending letter to n light source in m signal sending zone by light intensity modulator
Number S '1,S’2,…S’m×n, wherein m, n are integer, and the signal of transmitting is distinguished with the intensity size of light；
Step 2: assuming that the signal through light intensity modulator modulation that wherein n light source is emitted in k-th of signal sending zone is
S’1,S’2... S ', wherein k is 1 to integer between m；
Step 3: detector receives the issued light in optical signal launch end, wherein the signal light warp that k-th of signal sending zone is sent out
Signal transmission space is crossed, then in optical signal receiving end successively through the front device, filtering device；Or successively through described preposition
Device, filtering device, light wavelength conversion member；Or successively through the front device, light wavelength conversion member, filtering device；Or
Successively through the front device, filtering device, light wavelength conversion member, collimating element；Or successively through the front device, light wave
Long converting member, filtering device, collimating element；It is final to irradiate or successively through the front device, filtering device, collimating element
In optical detection pixel elements in the signal receiving area corresponding to the signal sending zone, if signal is sent in t moment step 2
Light intensity received by least n optical detection pixel elements in signal receiving area corresponding to region is respectively I1,I2,…
In,…；
Step 4: each optical detection pixel elements in signal receiving area corresponding to the signal sending zone in step 3 are received
To light intensity remove the augmented matrix for being updated to matrix equation after noise respectively each row unit in, and by the signal sending zone
It is lit the transmitting of light source under the interior independent ignition condition of each light source with this by value that above-mentioned each optical detection pixel elements are detected
The ratio that intensity removes the two after noise respectively is updated to respectively in each unit of each row of coefficient matrix of matrix equation, due to
The coefficient matrix each unit data can be measured in advance by experiment, therefore solved this matrix equation and obtained signal S1,S2,…Sn；
Step 5: taking S1,S2,…SnThe average value of this n value is as decision threshold, by S1,S2,…SnCompared with decision threshold
Compared with, be set as " 1 " greater than the value, be set as " 0 " less than the value, can optical signal receiving end obtain t moment optical signal launch end its
In in some signal sending zone the transmission of n light source actual signal S '1,S’2,…S’n；
Step 6: respectively by optical detection pixel elements in each signal receiving area corresponding to signal each in step 1 sending zone
Institute's measured data substitutes into each matrix equation, and respectively repeats steps 2-5, can be connect by solving m matrix equation in optical signal
Receiving end receives signal S '1,S’2,…S’m×n；
Step 7: different signals being modulated in different moments by light intensity modulator, light can be received in optical signal receiving end
The signal that signal transmitting terminal different moments are issued.
10. the communication signal of optical communication system described in any one claim as described above according to claim 11 is sent
With coding/decoding method, it is characterised in that: matrix equation can be calculated by convex optimized algorithm, Tikhonov regularization in the step 4
Method, L1 norm regularization algorithm, genetic algorithm, crisscross multiplier method, the one of which in simulated annealing are solved,
Also other known or unknown Mathematics Optimization Method solution matrix equation can be used to reduce the bit error rate of signal.
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