CN107147598A - A kind of visible light communication methods, devices and systems under water - Google Patents
A kind of visible light communication methods, devices and systems under water Download PDFInfo
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- CN107147598A CN107147598A CN201710252313.XA CN201710252313A CN107147598A CN 107147598 A CN107147598 A CN 107147598A CN 201710252313 A CN201710252313 A CN 201710252313A CN 107147598 A CN107147598 A CN 107147598A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
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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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
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Abstract
This application discloses a kind of visible light communication methods, devices and systems under water, methods described includes：The signal sent by multiple LED of SPAD receiving end/sending ends, wherein, the signal that the multiple LED is sent is that the transmitting terminal performs the multiplex coding signal obtained after serioparallel exchange and signal processing operations to target data；Successive interference cancellation processing is carried out to the superposed signal for meeting Poisson distribution that the SPAD is exported and obtains the corresponding detection signals of the multiple LED；Detection signal corresponding to the multiple LED performs parallel-serial conversion operation and obtains the target data.The methods, devices and systems of the embodiment of the present application, it is possible to increase the detection performance of the receiving terminal of visible light communication system under water, effectively realize the reliable communication of visible light communication system under water.
Description
Technical field
The application is related to visible light communication field, more particularly to a kind of visible light communication methods, devices and systems under water.
Background technology
Visible light communication (Visible Light Communication, VLC) technology is used as a kind of emerging communication skill
Art, refers to the technology communicated using visible ray as information carrier.According to the optical transmission window characteristic of seawater, can utilize can
The blue green light seen in optical band realizes visible light communication under water.
Visible light communication system includes transmitting terminal and receiving terminal under water, and target data is passed through modulating-coding by transmitting terminal, carries
In the visible ray that frequency is sent to light emitting diode (Light Emitting Diode, LED), and then the visible ray that LED is sent
It is transmitted under water in optical channel；Receiving terminal receives the visible ray for carrying target data, and the visible ray received is entered
Row detection process, and then extract the target data carried in visible ray.
In the prior art, under water the transmitting terminal of visible light communication system generally by target data carrier frequency on single led
It is transmitted.But, because single led electro-optic conversion has nonlinear characteristic so that receiving terminal is in signal detection processing
When the bit error rate it is higher, so as to cause the detection performance of receiving terminal relatively low.
The detection performance of the receiving terminal of visible light communication system under water how is improved, is that the application technology to be solved is asked
Topic.
The content of the invention
The embodiment of the present application provides a kind of visible light communication methods, devices and systems under water, to solve in the prior art
The problem of detection performance of the receiving terminal of visible light communication system is relatively low under water.
The embodiment of the present application provides a kind of visible light communication method under water, and methods described is applied in receiving terminal, methods described
Including：
The signal sent by multiple LEDs of single-photon avalanche diode SPAD receiving end/sending ends, wherein,
The signal that the multiple LED is sent is that the transmitting terminal is more to what is obtained after target data execution serioparallel exchange and signal transacting
Road encoded signal；
Successive interference cancellation processing is carried out to the superposed signal for meeting Poisson distribution that the SPAD is exported and obtains described many
The corresponding detection signal of individual LED；
Detection signal corresponding to the multiple LED performs parallel-serial conversion operation and obtains the target data.
Alternatively, the successive interference cancellation processing includes successive ignition decoding operation, wherein, the successive ignition decoding
The m times decoding operate in operation is specifically included：
According to following step, the corresponding detection signals of k-th of LED are determined：
Determine that k-th of LED is corresponding according to the kth input signal for inputting the signal estimator by signal estimator to estimate
Count signal；
Performed by kth deinterleaver estimation signal corresponding to k-th of LED and deinterleave operation, determined k-th
The corresponding de-interleaved signals of LED, wherein, the kth deinterleaver with the transmitting terminal it is corresponding with k-th of LED hand over
Knit device corresponding；
The corresponding de-interleaved signal perform decodings of k-th of LED are operated by kth decoder, determined described k-th
The corresponding detection signals and decoded signal of LED, wherein, the kth decoder with the transmitting terminal and k-th of LED
Corresponding encoder is corresponding；
The operation that interweaves is performed to the corresponding decoded signals of k-th of LED by kth interleaver, and the behaviour that interweaves will be performed
Signal after work inputs the signal estimator as the input signal of kth+1, wherein, the kth interleaver with the hair
Sending end interleaver corresponding with k-th of LED is identical.
Alternatively, m=1 is worked as, during k=1, the 1st input signal is the superposed signal；
Work as m>When 1, k=1, the 1st input signal is the N+1 input signals determined in the m-1 times iterative decoding, its
In, N is the multiple LED number.
Alternatively, k-th of LED is determined according to the kth input signal for inputting the signal estimator by signal estimator
Corresponding estimation signal, including：
The signal estimator determines the corresponding estimation signals of k-th of LED by following formula：
Wherein, eESE(xk) the corresponding estimation signals of k-th of LED are represented, y represents the Poisson meter of the SPAD outputs
Number, cpRepresent the Photoelectric Detection sensitivity of the SPAD, nsThe number of photons that k-th of LED is sent is represented, h represents that Underwater Optical is believed
The channel parameter in road,Represent the corresponding poisson noises of k-th of LED determined according to the kth input signal.
Alternatively, the channel parameter h of the optical channel under water is just to be distributed very much lognormal models and illiteracy by logarithm
What special Carlow numerical simulation MCNS was determined.
The embodiment of the present application also provides a kind of visible light communication method under water, and methods described is applied in transmitting terminal, the side
Method includes：
Receive target data to be sent；
Serioparallel exchange operation is performed to the target data and determines multiple signals；
Signal processing operations are performed to the multiple signals and obtain multiplex coding signal, and by with the multiplex coding
Multiple LED of signal same number send the multiplex coding signal to receiving terminal.
Alternatively, the signal processing operations include interleaving treatment, coded treatment and on-off keying OOK modulation treatments.
Alternatively, by multiple LED with the multiplex coding signal same number by the multiplex coding signal to connecing
Receiving end is sent, including：
By in single light fixture with multiple LED of the multiplex coding signal same number by the multiplex coding signal to
Receiving terminal is sent.
The embodiment of the present application also provides a kind of visible light communication device under water, and described device is applied in receiving terminal, the dress
Put including：Receiving unit, decoding unit and converting unit, wherein：
Receiving unit, for being sent out by multiple LEDs of single-photon avalanche diode SPAD receiving end/sending ends
The signal sent, wherein, the signal that the multiple LED is sent is that the transmitting terminal is performed at serioparallel exchange and signal to target data
The multiplex coding signal obtained after reason operation；
Decoding unit, the superposed signal for meeting Poisson distribution for being exported to the SPAD is used at successive interference cancellation
Reason obtains the corresponding detection signals of the multiple LED；
Converting unit, the target is obtained for performing parallel-serial conversion operation to the corresponding detection signals of the multiple LED
Data.
The embodiment of the present application also provides a kind of visible light communication device under water, and described device is applied in transmitting terminal, the dress
Put including：Receiving unit, converting unit, signal processing unit and transmitting element, wherein：
Receiving unit, the target data to be sent for receiving；
Converting unit, multiple signals are determined for performing serioparallel exchange operation to the target data；
Signal processing unit, multiplex coding signal is obtained for performing signal processing operations to the multiple signals；
Transmitting element, for being believed the multiplex coding by multiple LED with the multiplex coding signal same number
Number sent to receiving terminal.
The embodiment of the present application also provides a kind of visible light communication system under water, and the system includes：Apply in transmitting terminal
Visible light communication device and apply visible light communication device under water in receiving terminal under water.
At least one above-mentioned technical scheme that the embodiment of the present application is used can reach following beneficial effect：
The signal that the receiving terminal of visible light communication system is sent by multiple LED of SPAD receiving end/sending ends under water, wherein,
The signal that the multiple LED is sent is that the transmitting terminal is more to what is obtained after target data execution serioparallel exchange and signal transacting
Road encoded signal, carries out successive interference cancellation processing to the superposed signal for meeting Poisson distribution that the SPAD is exported and obtains described
The corresponding detection signal of multiple LED, and then parallel-serial conversion operation is performed to the corresponding detection signals of the multiple LED obtain described
Target data, so as to improve the detection performance of the receiving terminal of visible light communication system under water, effectively realizes visible ray under water
The reliable communication of communication system.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, this Shen
Schematic description and description please is used to explain the application, does not constitute the improper restriction to the application.In the accompanying drawings：
A kind of schematic flow sheet for method of visible light communication under water that Fig. 1 provides for the embodiment of the present application；
The schematic diagram for the first time iterative decoding that Fig. 2 provides for the embodiment of the present application；
A kind of schematic flow sheet for method of visible light communication under water that Fig. 3 provides for the embodiment of the present application；
The schematic diagram of the transmitting terminal for the visible light communication system under water that Fig. 4 provides for the embodiment of the present application；
A kind of schematic diagram for light fixture comprising multiple LED lamps that Fig. 5 provides for the embodiment of the present application；
A kind of schematic diagram for visible light communication system under water that Fig. 6 provides for the embodiment of the present application；
A kind of structural representation for device of visible light communication under water that Fig. 7 provides for the embodiment of the present application；
A kind of structural representation for device of visible light communication under water that Fig. 8 provides for the embodiment of the present application；
A kind of structural representation for visible light communication system under water that Fig. 9 provides for the embodiment of the present application.
Embodiment
In order to realize the purpose of the application, the embodiment of the present application provides a kind of visible light communication method, device under water and is
System, methods described includes：The letter that the receiving terminal of visible light communication system is sent by multiple LED of SPAD receiving end/sending ends under water
Number, wherein, the signal that the multiple LED is sent is after the transmitting terminal performs serioparallel exchange and signal transacting to target data
Obtained multiplex coding signal, successive interference cancellation processing is carried out to the superposed signal for meeting Poisson distribution that the SPAD is exported
The corresponding detection signals of the multiple LED are obtained, and then parallel-serial conversion operation is performed to the corresponding detection signals of the multiple LED
The target data is obtained, so as to improve the detection performance of the receiving terminal of visible light communication system under water, water is effectively realized
The reliable communication of lower visible light communication system.
Technical scheme is clearly and completely retouched with reference to the application specific embodiment and corresponding accompanying drawing
State.Obviously, described embodiment is only some embodiments of the present application, rather than whole embodiments.Based in the application
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made,
Belong to the scope of the application protection.
Below in conjunction with accompanying drawing, the technical scheme that each embodiment of the application is provided is described in detail.
Embodiment 1
A kind of schematic flow sheet for method of visible light communication under water that Fig. 1 provides for the embodiment of the present application.Methods described should
Used in receiving terminal, methods described can be with as follows.
Step 101：The letter sent by multiple LEDs of single-photon avalanche diode SPAD receiving end/sending ends
Number.
Wherein, the signal that the multiple LED is sent is that the transmitting terminal is performed at serioparallel exchange and signal to target data
The multiplex coding signal obtained after reason.
In the embodiment of the present application, the signal sent by multiple LED of SPAD receiving end/sending ends, including：
Subsurface communication link is built using SPAD, the SPAD receives the letter that the multiple LED of the transmitting terminal is sent
Number.
Under water in long range visible light communication system, the visible ray for carrying target data is believed through long-distance Underwater Optical
After road decay, the number of photons for reaching receiving terminal is seldom.
Single-photon can be detected relative to traditional photodiode PD, SPAD, under water long range visible light communication
In system, subsurface communication link is built using SPAD, the traffic level of tens of Mbps in the range of thousands of rice can be realized.
In the embodiment of the present application, under water in visible light communication system, transmitting terminal carries out signal biography using the multiple LED
Defeated, receiving terminal receives the signal that the multiple LED is sent using the SPAD.
Step 102：Successive interference cancellation is carried out to the superposed signal for meeting Poisson distribution that the SPAD is exported to handle
To the corresponding detection signals of the multiple LED.
Because the SPAD has Poisson characteristics, therefore, the SPAD receive signal that the multiple LED sends it
Afterwards, output meets the superposed signal of Poisson distribution.
In the embodiment of the present application, the successive interference cancellation processing includes successive ignition decoding operation, the successive ignition
The m times decoding operate in decoding operate is specifically included：
According to following step, the corresponding detection signals of k-th of LED are determined：
Determine that k-th of LED is corresponding according to the kth input signal for inputting the signal estimator by signal estimator to estimate
Count signal；
Performed by kth deinterleaver estimation signal corresponding to k-th of LED and deinterleave operation, determined k-th
The corresponding de-interleaved signals of LED, wherein, the kth deinterleaver with the transmitting terminal it is corresponding with k-th of LED hand over
Knit device corresponding；
The corresponding de-interleaved signal perform decodings of k-th of LED are operated by kth decoder, determined described k-th
The corresponding detection signals and decoded signal of LED, wherein, the kth decoder with the transmitting terminal and k-th of LED
Corresponding encoder is corresponding；
The operation that interweaves is performed to the corresponding decoded signals of k-th of LED by kth interleaver, and the behaviour that interweaves will be performed
Signal after work inputs the signal estimator as the input signal of kth+1, wherein, the kth interleaver with the hair
Sending end interleaver corresponding with k-th of LED is identical.
In the embodiment of the present application, work as m=1, during k=1, the kth input signal is the superposed signal；
Work as m>When 1, k=1, the kth input signal is the N+1 input signals determined in the m-1 times iterative decoding, its
In, N is the multiple LED number.
In the embodiment of the present application, determined by signal estimator according to the kth input signal for inputting the signal estimator
The corresponding estimation signals of k-th of LED, including：
The signal estimator determines the corresponding estimation signals of k-th of LED by following formula：
Wherein, eESE(xk) the corresponding estimation signals of k-th of LED are represented, y represents the Poisson meter of the SPAD outputs
Number, cpRepresent the Photoelectric Detection sensitivity of the SPAD, nsThe number of photons that k-th of LED is sent is represented, h represents that Underwater Optical is believed
The channel parameter in road,Represent the corresponding poisson noises of k-th of LED determined according to the kth input signal.
Wherein, the underwater signal parameter h is just to be distributed very much lognormal models and Monte Carlo numerical value by logarithm
Emulate what MCNS was determined.
Specifically, the scattering of optical channel and absorption coefficient are determined by Monte Carlo numerical simulation MCNS under water, water
The turbulivity of lower optical channel is determined by logarithm just too distribution lognormal models.
The schematic diagram for the first time iterative decoding that Fig. 2 provides for the embodiment of the present application.
As shown in Fig. 2 SPAD receives the signal that 3 LED are sent, and export the superposed signal for meeting Poisson distribution, institute
Superposed signal is stated as the 1st input signal and inputs baseband signal estimator ESE, the baseband signal estimator ESE according to described
1st input signal determines the corresponding estimation signals of the 1st LED by following formula：
Wherein, eESE(x1) the corresponding estimation signals of the 1st LED are represented, y represents the Poisson meter of the SPAD outputs
Number, cpRepresent the Photoelectric Detection sensitivity of the SPAD, nsThe number of photons that the 1st LED is sent is represented, h represents that Underwater Optical is believed
The channel parameter in road,Represent the 1st corresponding poisson noise of LED determined according to the 1st input signal.
For example, according to the 1st input signal, by other interference informations outside the corresponding estimation signals of the 1st LED etc.
Effect obtains the 1st corresponding poisson noise of LED
1st LED is corresponding to estimate signal eESE(x1) the 1st deinterleaver of input1st deinterleaver
Estimation signal e corresponding to the 1st LEDESE(x1) deinterleaving operation is performed, determine that the corresponding solutions of the 1st LED are handed over
Knit signal lDEC(c1)。
Wherein, the 1st deinterleaverWith in transmitting terminal interleaver Π corresponding with the 1st LED1Phase
Correspondence.
The corresponding de-interleaved signal l of 1st LEDDEC(c1) the 1st decoder DECs of input1, the 1st decoder
DECs1De-interleaved signal l corresponding to the 1st LEDDEC(c1) perform decoding operation, determine that the 1st LED is corresponding
Detect signal u1(lb) and the corresponding decoded signal e of the 1st LEDDEC(c1)。
Wherein, the 1st decoder DECs1It is relative with transmitting terminal encoder corresponding with the 1st LED
Should.
The corresponding decoded signal e of 1st LEDDEC(c1) the 1st interleaver Π of input1, the 1st interleaver Π1To institute
State the corresponding decoded signal e of the 1st LEDDEC(c1) operation that interweaves is performed, it is determined that performing the signal l after interweavingESE(x1), and will
The signal l performed after interweavingESE(x1) it is used as the 2nd input signal input baseband signal estimator ESE.
The baseband signal estimator ESE determines the 2nd LED correspondence according to the 2nd input signal by following formula
Estimation signal：
Wherein, eESE(x2) the corresponding estimation signals of the 2nd LED are represented, y represents the Poisson meter of the SPAD outputs
Number, cpRepresent the Photoelectric Detection sensitivity of the SPAD, nsThe number of photons that the 2nd LED is sent is represented, h represents that Underwater Optical is believed
The channel parameter in road,Represent the 2nd corresponding poisson noise of LED determined according to the 2nd input signal.
2nd LED is corresponding to estimate signal eESE(x2) the 2nd deinterleaver of input2nd deinterleaver
Estimation signal e corresponding to the 2nd LEDESE(x2) deinterleaving operation is performed, determine that the corresponding solutions of the 2nd LED are handed over
Knit signal lDEC(c2)。
Wherein, the 2nd deinterleaverWith in transmitting terminal interleaver Π corresponding with the 2nd LED2Phase
Correspondence.
The corresponding de-interleaved signal l of 2nd LEDDEC(c2) the 2nd decoder DECs of input2, the 2nd decoder
DECs2De-interleaved signal l corresponding to the 2nd LEDDEC(c2) perform decoding operation, determine that the 2nd LED is corresponding
Detect signal u2(lb) and the corresponding decoded signal e of the 2nd LEDDEC(c2)。
Wherein, the 2nd decoder DECs2It is relative with transmitting terminal encoder corresponding with the 2nd LED
Should.
The corresponding decoded signal e of 2nd LEDDEC(c2) the 2nd interleaver Π of input2, the 2nd interleaver Π2To institute
State the corresponding decoded signal e of the 2nd LEDDEC(c2) operation that interweaves is performed, it is determined that performing the signal l after interweavingESE(x2), and will
The signal l performed after interweavingESE(x2) it is used as the 3rd input signal input baseband signal estimator ESE.
The baseband signal estimator ESE determines the 3rd LED correspondence according to the 3rd input signal by following formula
Estimation signal：
Wherein, eESE(x3) the corresponding estimation signals of the 3rd LED are represented, y represents the Poisson meter of the SPAD outputs
Number, cpRepresent the Photoelectric Detection sensitivity of the SPAD, nsThe number of photons that the 3rd LED is sent is represented, h represents that Underwater Optical is believed
The channel parameter in road,Represent the 3rd corresponding poisson noise of LED determined according to the 3rd input signal.
3rd LED is corresponding to estimate signal eESE(x3) the 3rd deinterleaver of input3rd deinterleaver
Estimation signal e corresponding to the 3rd LEDESE(x3) deinterleaving operation is performed, determine that the corresponding solutions of the 3rd LED are handed over
Knit signal lDEC(c3)。
Wherein, the 3rd deinterleaverWith in transmitting terminal interleaver Π corresponding with the 3rd LED3Phase
Correspondence.
The corresponding de-interleaved signal l of 3rd LEDDEC(c3) the 3rd decoder DECs of input3, the 3rd decoder
DECs3De-interleaved signal l corresponding to the 3rd LEDDEC(c3) perform decoding operation, determine that the 3rd LED is corresponding
Detect signal u3(lb) and the corresponding decoded signal e of 3 LEDDEC(c3)。
Wherein, the 3rd decoder DECs3It is relative with transmitting terminal encoder corresponding with the 3rd LED
Should.
The corresponding decoded signal e of 3rd LEDDEC(c3) the 3rd interleaver Π of input3, the 3rd interleaver Π3To institute
State the corresponding decoded signal e of the 3rd LEDDEC(c3) operation that interweaves is performed, it is determined that performing the signal l after interweavingESE(x3), and will
The signal l performed after interweavingESE(x3) it is used as the 4th input signal input baseband signal estimator ESE.
So far, first time iterative decoding is completed, in this iterative decoding, the corresponding detection letters of 3 LED have been obtained
Number u1(lb)、u2(lb) and u3(lb)。
Using the 4th input signal again as the 1st input signal, the 2nd iterative decoding operation is performed, updates what is obtained
3 LED are corresponding to detect signal u1(lb)、u2(lb) and u3(lb)。
By that analogy, successive ignition decoding operation is carried out, after last time iterative decoding, described 3 LED pairs is obtained
The detection signal u answered1(lb)、u2(lb) and u3(lb)
Step 103：Detection signal corresponding to the multiple LED performs parallel-serial conversion operation and obtains the target data.
The corresponding detection signals of the multiple LED determined after operation are decoded for successive ignition and perform parallel-serial conversion behaviour
Make, obtain the target data.
Still by taking above-mentioned Fig. 2 as an example, believe for the corresponding detections of 3 LED determined after last time iterative decoding
Number u1(lb)、u2(lb) and u3(lb) parallel-serial conversion operation is performed, obtain target data u.
The embodiment of the present application provide technical scheme, under water the receiving terminal of visible light communication system pass through SPAD receive send
The signal that multiple LED at end are sent, wherein, the signal that the multiple LED is sent is that the transmitting terminal performs string to target data
And change with the multiplex coding signal obtained after signal processing operations, the superposition for meeting Poisson distribution exported to the SPAD
Signal carries out successive interference cancellation processing and obtains the corresponding detection signals of the multiple LED, and then corresponding to the multiple LED
Detection signal performs parallel-serial conversion operation and obtains the target data, so as to improve the reception of visible light communication system under water
The detection performance at end, effectively realizes the reliable communication of visible light communication system under water.
Embodiment 2
A kind of schematic flow sheet for method of visible light communication under water that Fig. 3 provides for the embodiment of the present application.Methods described should
Used in transmitting terminal, methods described can be with as follows.
Step 301：Receive target data to be sent.
Step 302：Serioparallel exchange operation is performed to the target data and determines multiple signals.
In the embodiment of the present application, the target data to single channel high-speed transfer performs serioparallel exchange operation, and single channel is passed at a high speed
The defeated target data is divided into the signal of multi-path low speed transmission.
Step 303：Signal processing operations are performed respectively to the multiple signals and obtain multiplex coding signal.
In the embodiment of the present application, the signal processing operations include interleaving treatment, coded treatment and on-off keying OOK and adjusted
System processing.
A kind of schematic diagram of the transmitting terminal for visible light communication system under water that Fig. 4 provides for the embodiment of the present application.
As shown in figure 4, the transmitting terminal of visible light communication system receives target data u to be sent under water, to the target
Data u performs serioparallel exchange operation, obtains 3 signal u1、u2And u3。
Respectively to 3 signal u1、u2And u3Perform encoding operation, three signal c after being encoded1、c2And c3。
Different interleavers is respectively adopted to three signal c after the coding1、c2And c3The operation that interweaves is performed, is handed over
Three signal v after knitting1、v2And v3。
It should be noted that each the corresponding interleaver of signal is different, and it is specific interleaver, it is described each for distinguishing
Signal.
Respectively to three signal v after the intertexture1、v2And v3On-off keying OOK modulation operations are performed, three volumes are obtained
Code signal s1、s2And s3。
Step 304：By multiple LED with the multiplex coding signal same number by the multiplex coding signal to connecing
Receiving end is sent.
In the embodiment of the present application, by multiple LED with the multiplex coding signal same number by the multiplex coding
Signal is sent to receiving terminal, including：
By in single light fixture with multiple LED of the multiplex coding signal same number by the multiplex coding signal to
Receiving terminal is sent.
A kind of schematic diagram for light fixture comprising multiple LED lamps that Fig. 5 provides for the embodiment of the present application.
As shown in figure 5, comprising 5 LED lamps in single light fixture, being capable of 5 signals of simultaneous transmission.
Still by taking above-mentioned Fig. 4 as an example, three encoded signals are transmitted to receiving terminal using the light fixture comprising 3 LED lamps
s1、s2And s3。
The technical scheme that the embodiment of the present application is provided, under water the transmitting terminal of visible light communication system receive target to be sent
Data, serioparallel exchange operation is performed to the target data and determines multiple signals, the multiple signals are performed at signal respectively
Multiplex coding signal is obtained after reason operation, by multiple LED with the multiplex coding signal same number by the multichannel
Encoded signal is sent to receiving terminal, improves the transmission rate of visible light communication system under water, simultaneously so that receiving terminal is received
After the multiplex coding signal, successive interference cancellation processing and parallel-serial conversion operation can be carried out, the number of targets is obtained
According to effective to realize visible light communication system under water so as to improve the detection performance of the receiving terminal of visible light communication system under water
The reliable communication of system.
Embodiment 3
A kind of schematic diagram for visible light communication system under water that Fig. 6 provides for the embodiment of the present application.
As shown in fig. 6, the transmitting terminal of visible light communication system receives target data u to be sent under water, to the target
Data u performs serioparallel exchange operation, obtains 3 signal u1、u2And u3。
Respectively to 3 signal u1、u2And u3Perform encoding operation, three signal c after being encoded1、c2And c3。
Different interleavers is respectively adopted to three signal c after the coding1、c2And c3The operation that interweaves is performed, is handed over
Three signal v after knitting1、v2And v3。
Respectively to three signal v after the intertexture1、v2And v3On-off keying OOK modulation operations are performed, three volumes are obtained
Code signal s1、s2And s3。
Three encoded signal s are transmitted to receiving terminal using the light fixture comprising 3 LED lamps1、s2And s3。
Subsurface communication link is built using SPAD, is sent by the SPAD 3 LED for receiving the transmitting terminal
Signal s1、s2And s3。
The superposed signal for meeting Poisson distribution that the SPAD is exported is handled using successive interference cancellation, described 3 are obtained
The corresponding detection signal of individual LED, and then parallel-serial conversion operation is performed to the corresponding detection signals of 3 LED obtain the mesh
Mark data u.
Embodiment 4
Fig. 7 for the embodiment of the present application provide it is a kind of under water can be by the structural representation of optical communication apparatus.Device 700 is applied
In receiving terminal, described device 700 includes：Receiving unit 701, decoding unit 702 and converting unit 703, wherein：
Receiving unit 701, for multiple LEDs by single-photon avalanche diode SPAD receiving end/sending ends
The signal of transmission, wherein, the signal that the multiple LED is sent is that the transmitting terminal performs serioparallel exchange and signal to target data
The multiplex coding signal obtained after processing；
Decoding unit 702, the superposed signal for meeting Poisson distribution for being exported to the SPAD carries out stepwise derivation and disappeared
Except processing obtains the corresponding detection signals of the multiple LED；
Converting unit 703, the mesh is obtained for performing parallel-serial conversion operation to the corresponding detection signals of the multiple LED
Mark data.
Alternatively, the successive interference cancellation processing includes successive ignition decoding operation, wherein, the successive ignition decoding
The m times decoding operate in operation is specifically included：
According to following step, the corresponding detection signals of k-th of LED are determined：
Determine that k-th of LED is corresponding according to the kth input signal for inputting the signal estimator by signal estimator to estimate
Count signal；
Performed by kth deinterleaver estimation signal corresponding to k-th of LED and deinterleave operation, determined k-th
The corresponding de-interleaved signals of LED, wherein, the kth deinterleaver with the transmitting terminal it is corresponding with k-th of LED hand over
Knit device corresponding；
The corresponding de-interleaved signal perform decodings of k-th of LED are operated by kth decoder, determined described k-th
The corresponding detection signals and decoded signal of LED, wherein, the kth decoder with the transmitting terminal and k-th of LED
Corresponding encoder is corresponding；
The operation that interweaves is performed to the corresponding decoded signals of k-th of LED by kth interleaver, and the behaviour that interweaves will be performed
Signal after work inputs the signal estimator as the input signal of kth+1, wherein, the kth interleaver with the hair
Sending end interleaver corresponding with k-th of LED is identical.
Alternatively, m=1 is worked as, during k=1, the kth input signal is the superposed signal；
Work as m>When 1, k=1, the kth input signal is the N+1 input signals determined in the m-1 times iterative decoding, its
In, N is the multiple LED number.
Alternatively, k-th of LED is determined according to the kth input signal for inputting the signal estimator by signal estimator
Corresponding estimation signal, including：
The signal estimator determines the corresponding estimation signals of k-th of LED by following formula：
Wherein, eESE(xk) the corresponding estimation signals of k-th of LED are represented, y represents the Poisson meter of the SPAD outputs
Number, cpRepresent the Photoelectric Detection sensitivity of the SPAD, nsThe number of photons that k-th of LED is sent is represented, h represents that Underwater Optical is believed
The channel parameter in road,Represent the corresponding poisson noises of k-th of LED determined according to the kth input signal.
Alternatively, the channel parameter h of the optical channel under water is just to be distributed very much lognormal models and illiteracy by logarithm
What special Carlow numerical simulation MCNS was determined.
According to a kind of visible light communication device under water applied in receiving terminal, receiving unit, which is used to receive by SPAD, to be sent
The signal that multiple LED at end are sent, wherein, the signal that the multiple LED is sent is that the transmitting terminal performs string to target data
And change and the multiplex coding signal obtained after signal transacting；The Poisson that meets that decoding unit is used to export the SPAD is divided
The superposed signal of cloth carries out successive interference cancellation processing and obtains the corresponding detection signals of the multiple LED；Converting unit be used for pair
The multiple LED is corresponding to detect that signal performs parallel-serial conversion operation and obtains the target data, under water may be used so as to improve
See the detection performance of the receiving terminal of optical communication system, effectively realize the reliable communication of visible light communication system under water.
Embodiment 5
Fig. 8 for the embodiment of the present application provide it is a kind of under water can be by the structural representation of optical communication apparatus.Device 800 is applied
In transmitting terminal, described device 800 includes：Receiving unit 801, converting unit 802, signal processing unit 803 and transmitting element
804, wherein：
Receiving unit 801, the target data to be sent for receiving；
Converting unit 802, multiple signals are determined for performing serioparallel exchange operation to the target data；
Signal processing unit 803, multiplex coding signal is obtained for performing signal processing operations to the multiple signals；
Transmitting element 804, for by multiple LED with the multiplex coding signal same number by the multiplex coding
Signal is sent to receiving terminal.
Alternatively, the signal processing operations include interleaving treatment, coded treatment and on-off keying OOK modulation treatments.
Alternatively, by multiple LED with the multiplex coding signal same number by the multiplex coding signal to connecing
Receiving end is sent, including：
By in single light fixture with multiple LED of the multiplex coding signal same number by the multiplex coding signal to
Receiving terminal is sent.
According to a kind of visible light communication device under water applied in transmitting terminal, receiving unit is used to receive target to be sent
Data；Converting unit is used to determine multiple signals to target data execution serioparallel exchange；Signal processing unit is used for institute
State multiple signals execution signal transacting and obtain multiplex coding signal；Transmitting element is used for by identical with the multiplex coding signal
Multiple LED of number send the multiplex coding signal to receiving terminal, improve the transmission speed of visible light communication system under water
Rate, simultaneously so that receiving terminal is received after the multiplex coding signal, can carry out successive interference cancellation processing and and go here and there
Conversion operation, obtains the target data, so as to improve the detection performance of the receiving terminal of visible light communication system under water, has
Effect realizes the reliable communication of visible light communication system under water.
Embodiment 6
A kind of structural representation for visible light communication system under water that Fig. 9 provides for the embodiment of the present application.System 900 is wrapped
Include：Apply receiving terminal a kind of device of visible light communication under water 700 and apply a kind of visible light communication under water in transmitting terminal
Device 800.
In the 1990s, for a technology improvement can clearly distinguish be on hardware improvement (for example,
Improvement to circuit structures such as diode, transistor, switches) or software on improvement (for the improvement of method flow).So
And, with the development of technology, the improvement of current many method flows can be considered as directly improving for hardware circuit.
Designer nearly all obtains corresponding hardware circuit by the way that improved method flow is programmed into hardware circuit.Cause
This, it cannot be said that the improvement of a method flow cannot be realized with hardware entities module.For example, PLD
(Programmable Logic Device, PLD) (such as field programmable gate array (Field Programmable Gate
Array, FPGA)) it is exactly such a integrated circuit, its logic function is determined by user to device programming.By designer
Voluntarily programming comes a digital display circuit " integrated " on a piece of PLD, without asking chip maker to design and make
Special IC chip.Moreover, nowadays, substitution manually makes IC chip, and this programming is also used instead mostly " patrols
Volume compiler (logic compiler) " software realizes that software compiler used is similar when it writes with program development,
And the source code before compiling also write by handy specific programming language, this is referred to as hardware description language
(Hardware Description Language, HDL), and HDL is also not only a kind of, but have many kinds, such as ABEL
(Advanced Boolean Expression Language)、AHDL(Altera Hardware Description
Language)、Confluence、CUPL(Cornell University Programming Language)、HDCal、JHDL
(Java Hardware Description Language)、Lava、Lola、MyHDL、PALASM、RHDL(Ruby
Hardware Description Language) etc., VHDL (Very-High-Speed are most generally used at present
Integrated Circuit Hardware Description Language) and Verilog.Those skilled in the art also should
This understands, it is only necessary to slightly programming in logic and be programmed into method flow in integrated circuit with above-mentioned several hardware description languages,
The hardware circuit for realizing the logical method flow can be just readily available.
Controller can be implemented in any suitable manner, for example, controller can take such as microprocessor or processing
Device and storage can by the computer of the computer readable program code (such as software or firmware) of (micro-) computing device
Read medium, gate, switch, application specific integrated circuit (Application Specific Integrated Circuit,
ASIC), the form of programmable logic controller (PLC) and embedded microcontroller, the example of controller includes but is not limited to following microcontroller
Device：ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20 and Silicone Labs C8051F320, are deposited
Memory controller is also implemented as a part for the control logic of memory.It is also known in the art that except with
Pure computer readable program code mode is realized beyond controller, can be made completely by the way that method and step is carried out into programming in logic
Obtain controller and come real in the form of gate, switch, application specific integrated circuit, programmable logic controller (PLC) and embedded microcontroller etc.
Existing identical function.Therefore this controller is considered a kind of hardware component, and various for realizing to including in it
The device of function can also be considered as the structure in hardware component.Or even, can be by for realizing that the device of various functions is regarded
For that not only can be the software module of implementation method but also can be the structure in hardware component.
System, device, module or unit that above-described embodiment is illustrated, can specifically be realized by computer chip or entity,
Or realized by the product with certain function.It is a kind of typically to realize that equipment is computer.Specifically, computer for example may be used
Think personal computer, laptop computer, cell phone, camera phone, smart phone, personal digital assistant, media play
It is any in device, navigation equipment, electronic mail equipment, game console, tablet PC, wearable device or these equipment
The combination of equipment.
For convenience of description, it is divided into various units during description apparatus above with function to describe respectively.Certainly, this is being implemented
The function of each unit can be realized in same or multiple softwares and/or hardware during application.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can be used in one or more computers for wherein including computer usable program code
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
In a typical configuration, computing device includes one or more processors (CPU), input/output interface, net
Network interface and internal memory.
Internal memory potentially includes the volatile memory in computer-readable medium, random access memory (RAM) and/or
The forms such as Nonvolatile memory, such as read-only storage (ROM) or flash memory (flash RAM).Internal memory is computer-readable medium
Example.
Computer-readable medium includes permanent and non-permanent, removable and non-removable media can be by any method
Or technology come realize information store.Information can be computer-readable instruction, data structure, the module of program or other data.
The example of the storage medium of computer includes, but are not limited to phase transition internal memory (PRAM), static RAM (SRAM), moved
State random access memory (DRAM), other kinds of random access memory (RAM), read-only storage (ROM), electric erasable
Programmable read only memory (EEPROM), fast flash memory bank or other memory techniques, read-only optical disc read-only storage (CD-ROM),
Digital versatile disc (DVD) or other optical storages, magnetic cassette tape, the storage of tape magnetic rigid disk or other magnetic storage apparatus
Or any other non-transmission medium, the information that can be accessed by a computing device available for storage.Define, calculate according to herein
Machine computer-readable recording medium does not include temporary computer readable media (transitory media), such as data-signal and carrier wave of modulation.
It should also be noted that, term " comprising ", "comprising" or its any other variant are intended to nonexcludability
Comprising so that process, method, commodity or equipment including a series of key elements are not only including those key elements, but also wrap
Include other key elements being not expressly set out, or also include for this process, method, commodity or equipment intrinsic want
Element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that wanted including described
Also there is other identical element in process, method, commodity or the equipment of element.
The application can be described in the general context of computer executable instructions, such as program
Module.Usually, program module includes performing particular task or realizes routine, program, object, the group of particular abstract data type
Part, data structure etc..The application can also be put into practice in a distributed computing environment, in these DCEs, by
Remote processing devices connected by communication network perform task.In a distributed computing environment, program module can be with
Positioned at including in the local and remote computer-readable storage medium including storage device.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiment.It is real especially for system
Apply for example, because it is substantially similar to embodiment of the method, so description is fairly simple, related part is referring to embodiment of the method
Part explanation.
Embodiments herein is the foregoing is only, the application is not limited to.For those skilled in the art
For, the application can have various modifications and variations.It is all any modifications made within spirit herein and principle, equivalent
Replace, improve etc., it should be included within the scope of claims hereof.
Claims (11)
1. a kind of visible light communication method under water, it is characterised in that methods described is applied in receiving terminal, and methods described includes：
The signal sent by multiple LEDs of single-photon avalanche diode SPAD receiving end/sending ends, wherein, it is described
The signal that multiple LED are sent is that the transmitting terminal is more to what is obtained after target data execution serioparallel exchange and signal processing operations
Road encoded signal；
Successive interference cancellation processing is carried out to the superposed signal for meeting Poisson distribution that the SPAD is exported and obtains the multiple LED
Corresponding detection signal；
Detection signal corresponding to the multiple LED performs parallel-serial conversion operation and obtains the target data.
2. the method as described in claim 1, it is characterised in that the successive interference cancellation processing includes successive ignition decoding behaviour
Make, wherein, the m times decoding operate in the successive ignition decoding operation is specifically included：
According to following step, the corresponding detection signals of k-th of LED are determined：
Determine that the corresponding estimations of k-th of LED are believed according to the kth input signal for inputting the signal estimator by signal estimator
Number；
By kth deinterleaver it is corresponding to k-th of LED estimation signal perform deinterleave operation, determine k-th LED pairs
The de-interleaved signal answered, wherein, the kth deinterleaver with transmitting terminal interleaver phase corresponding with k-th of LED
Correspondence；
The corresponding de-interleaved signal perform decodings of k-th of LED are operated by kth decoder, k-th of LED is determined
Corresponding detection signal and decoded signal, wherein, the kth decoder is corresponding with k-th of LED with the transmitting terminal
Encoder it is corresponding；
The operation that interweaves is performed to the corresponding decoded signals of k-th of LED by kth interleaver, and the operation that interweaves will be performed
Signal afterwards inputs the signal estimator as the input signal of kth+1, wherein, the kth interleaver with the transmitting terminal
Interleaver corresponding with k-th of LED is identical.
3. method as claimed in claim 2, it is characterised in that
Work as m=1, during k=1, the kth input signal is the superposed signal；
Work as m>When 1, k=1, the kth input signal is the N+1 input signals determined in the m-1 times iterative decoding, wherein, N
For the multiple LED number.
4. method as claimed in claim 2, it is characterised in that by signal estimator according to the input signal estimator
Kth input signal determines the corresponding estimation signals of k-th of LED, including：
The signal estimator determines the corresponding estimation signals of k-th of LED by following formula：
Wherein, eESE(xk) the corresponding estimation signals of k-th of LED are represented, y represents that the Poisson of the SPAD outputs is counted, cp
Represent the Photoelectric Detection sensitivity of the SPAD, nsRepresent the number of photons that k-th of LED is sent, h represents optical channel under water
Channel parameter,Represent the corresponding poisson noises of k-th of LED determined according to the kth input signal.
5. method as claimed in claim 4, it is characterised in that the channel parameter h of the optical channel under water be by logarithm just
Too distribution lognormal models and Monte Carlo numerical simulation MCNS are determined.
6. a kind of visible light communication method under water, it is characterised in that methods described is applied in transmitting terminal, and methods described includes：
Receive target data to be sent；
Serioparallel exchange operation is performed to the target data and determines multiple signals；
Signal processing operations are performed to the multiple signals and obtain multiplex coding signal, and by with the multiplex coding signal
Multiple LED of same number send the multiplex coding signal to receiving terminal.
7. method as claimed in claim 6, it is characterised in that the signal processing operations include interleaving treatment, coded treatment
And on-off keying OOK modulation treatments.
8. method as claimed in claim 6, it is characterised in that by multiple with the multiplex coding signal same number
LED sends the multiplex coding signal to receiving terminal, including：
By in single light fixture with multiple LED of the multiplex coding signal same number by the multiplex coding signal to reception
End is sent.
9. a kind of visible light communication device under water, it is characterised in that described device is applied in receiver section, and described device includes：Connect
Unit, decoding unit and converting unit are received, wherein：
Receiving unit, sends for multiple LEDs by single-photon avalanche diode SPAD receiving end/sending ends
Signal, wherein, the signal that the multiple LED is sent is that the transmitting terminal performs serioparallel exchange to target data and signal transacting is grasped
The multiplex coding signal obtained after work；
Decoding unit, the superposed signal for meeting Poisson distribution for being exported to the SPAD carries out successive interference cancellation and handled
To the corresponding detection signals of the multiple LED；
Converting unit, the target data is obtained for performing parallel-serial conversion operation to the corresponding detection signals of the multiple LED.
10. a kind of visible light communication device under water, it is characterised in that methods described is applied in transmitting terminal, and described device includes：Connect
Unit, converting unit, signal processing unit and transmitting element are received, wherein：
Receiving unit, the target data to be sent for receiving；
Converting unit, multiple signals are determined for performing serioparallel exchange operation to the target data；
Signal processing unit, multiplex coding signal is obtained for performing signal processing operations to the multiple signals；
Transmitting element, for by multiple LED with the multiplex coding signal same number by the multiplex coding signal to
Receiving terminal is sent.
11. a kind of visible light communication system under water, it is characterised in that the system includes：Apply in the visible under water of transmitting terminal
Optical communication apparatus and apply visible light communication device under water in receiving terminal.
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