CN105933062A - Remote underwater visible light communication method and system - Google Patents
Remote underwater visible light communication method and system Download PDFInfo
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- CN105933062A CN105933062A CN201610504423.6A CN201610504423A CN105933062A CN 105933062 A CN105933062 A CN 105933062A CN 201610504423 A CN201610504423 A CN 201610504423A CN 105933062 A CN105933062 A CN 105933062A
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- likelihood ratio
- visible light
- visible ray
- ray information
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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
-
- 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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
Abstract
The invention provides a remote underwater visible light communication method and system. The remote underwater visible light communication method comprises the steps of: according to a known transmission rate, detecting visible light information sent by a sending end, and after detecting the visible light information of a plurality of bits, calculating a log-likelihood ratio of each received bit; multiplying the log-likelihood ratios of all the received bits and constructing a combined discriminant criterion; according to the combined discriminant criterion, discriminating a value of each received bit. Therefore, according to the scheme of the application, after the visible light information of a plurality of bits are detected, the log-likelihood ratio of each received bit is calculated, the log-likelihood ratios of all the received bits are multiplied, and the combined discriminant criterion is constructed, so that the visible light information of a plurality of bits received by a receiving end can be subjected to combined detection; correlation between the received visible light information is sufficiently utilized; remote single photon detection performance is promoted; compared with hard decision demodulation of one single bit, the remote underwater visible light communication method can greatly improve detection performance of the receiving end.
Description
Technical field
The present invention relates to communication technical field, particularly to one visible light communication method the most under water
And system.
Background technology
Owing to sea water is much smaller to the decay of other band of light to the attenuation ratio of blue green light, this makes to utilize
Blue green light carries out submarine optical communication and is possibly realized.
Compared to short-range communication link, when visible light communication VLC for long-distance transmissions (beacon guides,
Underground monitoring system, deep-sea trunking traffic) time, the number of photons arriving receiving terminal is the most little, it is seen that light
Signal is possibly even buried in noise.
Therefore, when visible light communication VLC is for long-distance transmissions, the detection performance of receiving terminal is the lowest.
Summary of the invention
In view of this, the invention provides a kind of visible light communication method and system the most under water, with
Improve the detection performance of receiving terminal.
For achieving the above object, the present invention provides following technical scheme:
A kind of visible light communication method the most under water, including:
The visible ray information sent according to known transfer rate detection transmitting terminal, and multiple ratio detected
After special described visible ray information, calculate the log-likelihood ratio of each described bit received；
The described log-likelihood ratio of each described bit received is multiplied, builds associating criterion；
The value of each described bit received is differentiated according to described associating criterion.
Preferably, the described visible ray information sent according to known transfer rate detection transmitting terminal, including:
Utilize single-photon avalanche diode SPAD to build telecommunication link under water, and utilize double gamma
Function impulse models fitting actual channel pulse, detects described transmitting terminal according to known transfer rate and sends
Described visible ray information.
Preferably, the described described log-likelihood ratio by each described bit received is multiplied, and builds connection
Close criterion, including:
The described log-likelihood ratio of each described bit received is multiplied, calculates total log-likelihood ratio
Maximum, and build associating criterion according to described maximum.
Preferably, described visible ray information is to be used binary system on off keying OOK modulation by described transmitting terminal
Mode sends.
A kind of visible light communication system the most under water, including:
Detection module, for the visible ray information sent according to known transfer rate detection transmitting terminal, and
After the described visible ray information of multiple bit being detected, calculate the logarithm of each described bit received
Likelihood ratio；
Build module, for the described log-likelihood ratio of each described bit received is multiplied, build
Associating criterion；
Discrimination module, for differentiating the value of each described bit received according to described associating criterion.
Preferably, described detection module, specifically for:
Utilize single-photon avalanche diode SPAD to build telecommunication link under water, and utilize double gamma
Function impulse models fitting actual channel pulse, detects described transmitting terminal according to known transfer rate and sends
Described visible ray information.
Preferably, described structure module, specifically for:
The described log-likelihood ratio of each described bit received is multiplied, calculates total log-likelihood ratio
Maximum, and build associating criterion according to described maximum.
Preferably, described visible ray information is to be used binary system on off keying OOK modulation by described transmitting terminal
Mode sends.
The visible light communication method and system the most under water provided by the present invention, according to known biography
The visible ray information that defeated speed detection transmitting terminal sends, and believe at the described visible ray multiple bit being detected
After breath, calculate the log-likelihood ratio of each described bit received；The each described bit that will receive
Described log-likelihood ratio be multiplied, build associating criterion；Differentiate according to described associating criterion and connect
The value of each described bit received.Visible, the application scheme is detecting the described visible of multiple bit
After optical information, calculate the log-likelihood ratio of each described bit received, each described by receive
The described log-likelihood ratio of bit is multiplied, and builds associating criterion, can receive receiving terminal many
The visible ray information of individual bit carries out joint-detection, makes full use of the phase between the visible ray information received
Guan Xing, promotes the detection performance of remote single photon, is compared to the hard decision demodulation of individual bit, energy
Enough it is greatly promoted the detection performance of receiving terminal.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the stream of the visible light communication method the most under water that the present invention the first specific embodiment provides
Journey schematic diagram；
Fig. 2 is the knot of the visible light communication system the most under water that the present invention the second specific embodiment provides
Structure schematic diagram.
Detailed description of the invention
The invention provides a kind of visible light communication method the most under water, and a kind of water at a distance
Lower visible light communication system, it is possible to promote the detection performance of receiving terminal.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
Referring to Fig. 1, Fig. 1 is that the visible ray the most under water that the present invention the first specific embodiment provides leads to
The schematic flow sheet of letter method.
The visible light communication method the most under water that the present invention the first specific embodiment provides, including following
Step:
S101: the visible ray information sent according to known transfer rate detection transmitting terminal, and detecting
After the described visible ray information of multiple bits, calculate the log-likelihood ratio of each described bit received；
The invention belongs to efficient detection technology based on visible light communication under water, specifically refer to coastal waters and harbour
Under the conditions of remote physical layer communication.
In the embodiment of the present application, described visible ray information is to be used binary system open-close bond by described transmitting terminal
Control OOK modulation system sends.At the visible ray letter sent according to known transfer rate detection transmitting terminal
During breath, it is to utilize single-photon avalanche diode SPAD to build telecommunication link under water, and utilizes double
Gamma function impulse models fitting actual channel pulse, detects described transmission according to known transfer rate
The described visible ray information that end sends.
Compared to conventional photodiode PD, single-photon avalanche diode SPAD can detect single-photon.
Presently disclosed material shows, when transfer rate is 1kb/s, the performance of SPAD is better than common PD about
46dB, when transfer rate is 1Mb/s, the performance of SPAD is better than common PD about 30.5dB.Utilize
SPAD builds telecommunication link under water, it is possible to achieve the traffic of tens of Mbps in the range of thousands of rice
Level.
The impulse response of the channel of visible light communication under water at coastal waters and harbour does not has the most pervasive enclosed to express
Formula, can only obtain the channel under specified conditions by numerical simulation and describe.Based in remote muddy water
Decay distance is big, and multiple scattering in the highest flight, can be come near by the closed expression of double Gamma functions
Like the shock response representing channel.The closed expression of double Gamma functions is:
For remote singl e photon detection system under water, transmitting terminal LED uses on-off keying OOK modulation
Mode, single-photon avalanche diode SPAD detection is number of photons, in a bit transmission time,
The number of photons that SPAD receives obeys Poisson distribution.For individual bit, if during detection not and
Adjacent several bits are correlated with, and the performance of detection will not be then optimum.
S102: be multiplied by the described log-likelihood ratio of each described bit received, builds associating differentiation
Criterion；
In the embodiment of the present application, the described log-likelihood ratio of each described bit received is being multiplied,
When building associating criterion, it is that the described log-likelihood ratio of each described bit received is multiplied,
Calculate the maximum of total log-likelihood ratio, and build associating criterion according to described maximum.
Concrete, the implementation condition of the detection method of the present invention is that transmitting terminal uses OOK modulation, physics bar
Part be due to subsurface communication under the conditions of, the change of the turbulent flow of current may be considered within fixing a period of time
Slowly varying, when the transfer rate of signal changes between hundreds of Mbps to thousands of Mbps, channel
Double gamma functions may be considered relative constancy.In other words, in the range of 1-100us, it is believed that
Channel h (t) is constant.After receiving terminal SPAD detects the information of several bits, carry out associating inspection
Survey.
R (k)=η (h (t) * p (t)) s (k)+η (h (t) * pnoise(t))+NDCR·T
R (k+1)=η (h (t+T) * p (t+T)) s (k+1)+η (h (+Tt) * pnoise(t+T))+NDCR·T
……
R (k+n-1)=η (h (t+ (n-1) T) * p (t+ (n-1) T)) s (k+1)+
η(h(t+(n-1)T)*pnoise(t+(n-1)T))+NDCR·T
Associating criterion
Wherein, r (k) represents that kth receives signal, and r (k+n-1) represents that kth+n receives signal, h (t) table
Reference road, s (k) characterizes and sends signal, and η represents conversion factor, NDCRFor dark counting, T is individual bit
The lasting later stage.
S103: differentiate the value of each described bit received according to described associating criterion.
Object of the present invention is to provide a kind of remote single photon many bits joint detection under water
Case, the program have employed the associated detecting method of multiple bits of a kind of novelty, improves the detection of system
Performance.This joint-detection scheme based on many bits is by calculating Soft Inform ation (probability), at transmitting terminal 0
When sending with 1 equiprobability, being equivalent to maximum likelihood ML detection, receiving terminal is equivalent to maximum likelihood and differentiates
Criterion.Be compared to individual bit hard decision demodulation, the program can obtain better performance gain.
In general, the present invention proposes the scheme that the high-effect long distance for underwater environment detects, and can promote
The performance of system, meaning of the present invention is that this.
This Maximum likelihood sequence detection technology based on Soft Inform ation, at applicable coastal waters and the environment at harbour
Double gamma function impulse models under, combine many bits by the number of photons that SPAD is received
Detection, after what receiving terminal SPAD detected obtains number of photons, uses logarithm logic likelihood ratio LLR to calculate many
The Soft Inform ation of the light number of words of individual bit, is greatly improved the performance of transmission system.In general, according to this
Many symbols joint demodulation algorithm that invention uses, is effectively guaranteed its direct application.
Additionally, present invention also offers a kind of above-mentioned at a distance corresponding remote of visible light communication method the most under water
The visible light communication system under water of distance, with reference to shown in Fig. 2, is that the present invention the second specific embodiment provides
The structural representation of at a distance visible light communication system the most under water.This system includes:
Detection module 1, for the visible ray information sent according to known transfer rate detection transmitting terminal, and
After the described visible ray information of multiple bit being detected, calculate the logarithm of each described bit received
Likelihood ratio；
Preferably, described visible ray information is to be used binary system on off keying OOK modulation by described transmitting terminal
Mode sends.
Preferably, described detection module 1, specifically for:
Utilize single-photon avalanche diode SPAD to build telecommunication link under water, and utilize double gamma
Function impulse models fitting actual channel pulse, detects described transmitting terminal according to known transfer rate and sends
Described visible ray information.
Build module 2, for the described log-likelihood ratio of each described bit received is multiplied, build
Associating criterion；
Preferably, described structure module 2, specifically for:
The described log-likelihood ratio of each described bit received is multiplied, calculates total log-likelihood ratio
Maximum, and build associating criterion according to described maximum.
Discrimination module 3, for differentiating each described bit received according to described associating criterion
Value.
The visible light communication system the most under water that the embodiment of the present application provides, can use said method
Visible light communication method the most under water in embodiment, concrete function is referred to any of the above-described method
Step in embodiment describes, and here is omitted.
The visible light communication method and system the most under water provided by the present invention, according to known biography
The visible ray information that defeated speed detection transmitting terminal sends, and believe at the described visible ray multiple bit being detected
After breath, calculate the log-likelihood ratio of each described bit received；The each described bit that will receive
Described log-likelihood ratio be multiplied, build associating criterion；Differentiate according to described associating criterion and connect
The value of each described bit received.Visible, the application scheme is detecting the described visible of multiple bit
After optical information, calculate the log-likelihood ratio of each described bit received, each described by receive
The described log-likelihood ratio of bit is multiplied, and builds associating criterion, can receive receiving terminal many
The visible ray information of individual bit carries out joint-detection, makes full use of the phase between the visible ray information received
Guan Xing, promotes the detection performance of remote single photon, is compared to the hard decision demodulation of individual bit, energy
Enough it is greatly promoted the detection performance of receiving terminal.
For convenience of description, it is divided into various unit to be respectively described with function when describing apparatus above.Certainly,
The function of each unit can be realized in same or multiple softwares and/or hardware when implementing the application.
Each embodiment in this specification all uses the mode gone forward one by one to describe, identical between each embodiment
Similar part sees mutually, and what each embodiment stressed is different from other embodiments
Part.For device or system embodiment, owing to it is substantially similar to embodiment of the method,
So describing fairly simple, relevant part sees the part of embodiment of the method and illustrates.Above retouched
The Apparatus and system embodiment stated is only schematically, the wherein said unit illustrated as separating component
Can be or may not be physically separate, the parts shown as unit can be or also may be used
Not to be physical location, i.e. may be located at a place, or can also be distributed on multiple NE.
Some or all of module therein can be selected according to the actual needs to realize the mesh of the present embodiment scheme
's.Those of ordinary skill in the art, in the case of not paying creative work, are i.e. appreciated that and implement.
Professional further appreciates that, respectively shows in conjunction with what the embodiments described herein described
The unit of example and algorithm steps, it is possible to electronic hardware, computer software or the two be implemented in combination in,
In order to clearly demonstrate the interchangeability of hardware and software, the most general according to function
Describe composition and the step of each example.These functions perform with hardware or software mode actually,
Depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can be to each specific
Should be used for use different methods to realize described function, but this realization is it is not considered that beyond this
The scope of invention.
The method described in conjunction with the embodiments described herein or the step of algorithm can directly use hardware,
The software module that processor performs, or the combination of the two implements.Software module can be placed in and deposit at random
Reservoir (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electric erasable can be compiled
Appointing well known in journey ROM, depositor, hard disk, moveable magnetic disc, CD-ROM or technical field
In the storage medium of other form of anticipating.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (8)
1. a remote visible light communication method the most under water, it is characterised in that including:
The visible ray information sent according to known transfer rate detection transmitting terminal, and multiple ratio detected
After special described visible ray information, calculate the log-likelihood ratio of each described bit received；
The described log-likelihood ratio of each described bit received is multiplied, builds associating criterion；
The value of each described bit received is differentiated according to described associating criterion.
Method the most according to claim 1, it is characterised in that described according to known transfer rate
The visible ray information that detection transmitting terminal sends, including:
Utilize single-photon avalanche diode SPAD to build telecommunication link under water, and utilize double gamma
Function impulse models fitting actual channel pulse, detects described transmitting terminal according to known transfer rate and sends
Described visible ray information.
Method the most according to claim 1, it is characterised in that described each described by receive
The described log-likelihood ratio of bit is multiplied, and builds associating criterion, including:
The described log-likelihood ratio of each described bit received is multiplied, calculates total log-likelihood ratio
Maximum, and build associating criterion according to described maximum.
Method the most according to claim 1, it is characterised in that described visible ray information is by described
Transmitting terminal uses binary system on off keying OOK modulation system to send.
5. a remote visible light communication system the most under water, it is characterised in that including:
Detection module, for the visible ray information sent according to known transfer rate detection transmitting terminal, and
After the described visible ray information of multiple bit being detected, calculate the logarithm of each described bit received
Likelihood ratio；
Build module, for the described log-likelihood ratio of each described bit received is multiplied, build
Associating criterion；
Discrimination module, for differentiating the value of each described bit received according to described associating criterion.
System the most according to claim 5, it is characterised in that described detection module, specifically for:
Utilize single-photon avalanche diode SPAD to build telecommunication link under water, and utilize double gamma
Function impulse models fitting actual channel pulse, detects described transmitting terminal according to known transfer rate and sends
Described visible ray information.
System the most according to claim 5, it is characterised in that described structure module, specifically for:
The described log-likelihood ratio of each described bit received is multiplied, calculates total log-likelihood ratio
Maximum, and build associating criterion according to described maximum.
System the most according to claim 5, it is characterised in that described visible ray information is by described
Transmitting terminal uses binary system on off keying OOK modulation system to send.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107147598A (en) * | 2017-04-18 | 2017-09-08 | 东莞信大融合创新研究院 | A kind of visible light communication methods, devices and systems under water |
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