CN110071769A - A kind of optical communication method and its optical communication system based on association in time imaging - Google Patents
A kind of optical communication method and its optical communication system based on association in time imaging Download PDFInfo
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- CN110071769A CN110071769A CN201910250882.XA CN201910250882A CN110071769A CN 110071769 A CN110071769 A CN 110071769A CN 201910250882 A CN201910250882 A CN 201910250882A CN 110071769 A CN110071769 A CN 110071769A
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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
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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Abstract
The invention proposes a kind of optical communication methods based on association in time imaging, this method is by association in time imaging applications to optical communication field, the intensity modulated mode of association in time imaging is replaced into existing optic communication modulation system, the secrecy and noiseproof feature of association in time imaging, ensure that the safety and accuracy of transmission information.In addition, the present invention has further expanded channel coding method, using the intensity mode of association in time imaging method transmission information, bit information entrained by system is subjected to stepping according to intensity and improves optical communication capability and safety.The invention also provides a kind of optical communication systems based on association in time imaging.
Description
Technical field
The invention belongs to technical field of photo communication more particularly to it is a kind of based on association in time imaging optical communication method and its
Optical communication system.
Background technique
With the rapid development of the communication technology, big data era comes, and people are increasing for the demand of information resources,
Various information service flow demands promote optical communication system that must rapidly and accurately update transmission rate and capacity in time.For reality
The optical communication system of existing larger capacity, people are according to the different physical features of light, from frequency, polarization, time, phase, amplitude etc.
Aspect realizes the modulation and transmission of optic communication, has greatly expanded the capacity and distance of transmission.
Association in time imaging is expansion of the relevance imaging technology in time-domain, it, which is used, has random time strength fluctuation
Incoherent light source detection time object can reconstruct time signal well, then can be applied to optical communication field.
Existing optical communication method transmits to the signal of realization high-speed high capacity, it is clear that needs quite high sampling frequency in receiving end
Rate, while the safety to further ensure communication, it is also desirable to carry out scrambled, which increases the superfluous of transmission information
Remaining, these factors all limit the further genralrlization of technology.And association in time imaging applications realize a kind of line in optical communication field
To the transmission of point, i.e., without the accurate sampling in receiving end realization to each information, the energy value of transmission information need to be only received,
Transmission information can be reconstructed, has preferable interference free performance, while before reconstruct, transmission information guarantees at normal distribution
The safety of information.
It is real the object of the present invention is to provide a kind of optical communication method and optical communication system based on association in time imaging
Existing large capacity, safe data transmission, improves the resource utilization of optic communication.
Summary of the invention
A kind of optical communication method based on association in time imaging proposed by the present invention, comprising the following steps:
S1 step 1: information source passes through channel coding, and the encoded formation of the bit information of binary signal is by fourth gear signal structure
At information；
S2 step 2: using chaos light as the carrier of information, the information after coding is loaded on carrier and is transmitted to reception
End；
S3 step 3: the receiving end is constituted using the bucket detector without temporal resolution, and the bucket detector receives warp
Signal obtains signal light intensity information；
S4 step 4: signal light intensity information is demodulated through compressed sensing algorithm, according to the relevant threshold value of fourth gear signal into
Row analysis therefrom reconstructs the time series being made of fourth gear signal；
S5 step 5: time series is subjected to channel decoding, restores the bit information of binary signal.
In the optical communication method based on association in time imaging proposed by the present invention, the information source is to be constituted by 0 and 1
Binary sequence；It is that the binary sequence of 0 and 1 composition is subjected to stepping by the information that fourth gear signal is constituted, by 00 coding
It is 0,01 to be encoded to 1,10 and be encoded to 2,11 and be encoded to 3, constitutes the information that time series is T (t).
In the optical communication method based on association in time imaging proposed by the present invention, the chaos gloss Logistic
Time series T (t) is loaded on chaos light sequence I (t), and be transferred to reception by model of the model as this paper in transmission
End；Logistic mapping is indicated with following formula:
xn+1=μ xn(1-xn) (1)
Wherein, xnFor iteration initial value, and xn∈[0,1]；μ is system parameter, and μ ∈ [0,4]；When μ=4, Logistic
Mapping enters full mapping status, which has great randomness.
In the optical communication method based on association in time imaging proposed by the present invention, what the bucket detector received is
The energy intensity value of information is transmitted shown in following formula:
B=∫ dtI (t) T (t) (2)
By repeatedly to the transmission of time series T (t), obtaining a series of transmission information B (i).
In the optical communication method based on association in time imaging proposed by the present invention, transmission information B (i) and chaos light sequence
Column I (t) demodulated with compressed sensing, it is demodulated after time series indicated with following formula:
Tcs=arg min:| | T | |L1S.t.B=∫ dtI (t) T (t) (3)
Tcs is the information after demodulation, and T is time serial number, and L1 is L1 norm.
In the optical communication method based on association in time imaging proposed by the present invention, in step 5 further to demodulation after
Information average value is found out as threshold value using the difference method of average, composition stimulus threshold criterion.
In the optical communication method based on association in time imaging proposed by the present invention, in step 5, demodulated reconstruct
Information afterwards is converted into the sequence being made of 0 and 1 by channel coding for the sequence being made of 0,1,2,3 fourth gear signal, complete
At the transmission of information.
The invention also provides a kind of optical communication system based on association in time imaging, including information source, channel and the stay of two nights,
Channel encoding unit, modulation unit, receiving end, demodulating unit are set gradually between the information source and the stay of two nights and channel is counter compiles
Code unit；The information source is connect with the channel encoding unit, and the output of the channel encoding unit and the modulation unit connect
It connects, the modulation unit loads the information into chaos light, and channel is transferred to receiving end, and it is single that receiving end connects the demodulation
Member, demodulated signal is by the channel Gray code unit, and the channel Gray code unit after going back prime information for being sent to
The stay of two nights.
Compared with prior art, beneficial effects of the present invention: optical communication method of the present invention arrives association in time imaging applications
The intensity modulated mode of association in time imaging is replaced existing optic communication modulation system, association in time imaging by optical communication field
Secrecy and noiseproof feature, ensure that transmission information safety and accuracy.The present invention has further expanded channel coding
Mode, using association in time imaging method transmission information intensity mode, by bit information entrained by system according to intensity into
Row stepping, improves optical communication capability and safety.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of optical communication system of the present invention.
Fig. 2 is the waveform diagram that signal is divided into fourth gear signal.
Fig. 3 is transmission information histogram
Fig. 4 is demodulation reconstruct schematic diagram.
Fig. 5 is the flow chart of optical communication method of the present invention.
Specific embodiment
Below in conjunction with schematic diagram to the optical communication method proposed by the present invention based on association in time imaging and its optic communication
System is described in more detail, and which show the preferred embodiment of the present invention, it should be appreciated that those skilled in the art can be with
Invention described herein is modified, and still realizes advantageous effects of the invention.Therefore, following description should be understood as
Those skilled in the art's is widely known, and is not intended as limitation of the present invention.
The optical communication system based on association in time imaging in the present invention, structure is as shown in Figure 1, include information source, channel
And the stay of two nights, channel encoding unit, modulation unit, receiving end, demodulating unit are set gradually between the information source and the stay of two nights
With channel Gray code unit；The information source is connect with the channel encoding unit, the output of the channel encoding unit with it is described
Modulation unit connection, the modulation unit load the information into chaos light, and channel is transferred to receiving end, and receiving end connects institute
Demodulating unit is stated, demodulated signal is by the channel Gray code unit, and the channel Gray code unit is for going back prime information
After be sent to the stay of two nights.
The optical communication method of above-mentioned optical communication system is as shown in Figure 5:
Step 1: information source passes through channel coding, and the encoded formation of the bit information of binary signal is made of fourth gear signal
Information；
Step 2: using chaos light as the carrier of information, the information after coding is loaded on carrier and is transmitted to receiving end；
Step 3: the receiving end is constituted using the bucket detector without temporal resolution, and the bucket detector is received through believing
Number obtain signal light intensity information；
Step 4: signal light intensity information is demodulated through compressed sensing algorithm, is carried out according to the relevant threshold value of fourth gear signal
Analysis therefrom reconstructs the time series being made of fourth gear signal；
Step 5: time series is subjected to channel decoding, restores the bit information of binary signal.
The step 1 specifically, information source be by 0 and 1 binary sequence constituted, by channel coding in the present invention,
The binary sequence of 0 and 1 composition is subjected to stepping, 0,01 is encoded to by 00 and is encoded to 1,10 and is encoded to 2,11 and be encoded to 3.This
Sample completes the stepping to original series, and signal length reduces half, and the time series of composition is T (t).Traditional channel coding side
Formula essence is to add redundancy, although realizing that redundancy check ensure that the accuracy of information, also increases transmission total amount, reduces biography
Defeated rate.
In addition progressive extension may be implemented in coding mode of the invention, and the letter of three bits is such as replaced with 0 to 15,16 grade
Breath, i.e., 000, which represents 0,001, represents 1,010 and represents 2, and so on.
The step 2 is specifically, chaos light has controllable randomness of good time and second-order time relevance, simultaneously
With good Cryptographic Properties, therefore as transmission light source.Here using the Logistic model being simply but widely used
As the model of this paper, Logistic mapping is defined as follows
xn+1=μ xn(1-xn) (1)
Wherein, xnFor iteration initial value, and xn∈[0,1]；μ is system parameter, and μ ∈ [0,4].Theoretical proof, μ=4
When, Logistic mapping enters full mapping status, which has great randomness.
In transmission, time series T (t) is loaded on chaos light sequence I (t), and be transferred to receiving end.
The step 3 is received specifically, the information to come by transmission by the bucket detector of no temporal resolution.
What bucket detector received here is the energy intensity value for transmitting information, is shown below
B=∫ dtI (t) T (t) (2)
I.e. a string of time serial numbers pass through transmission, receive an intensity value by bucket detector.Association in time imaging is originally
Multi collect is needed in matter, can reconstruct information, therefore, using chaos light repeated loading information and is transferred to receiving end.
By repeatedly to the transmission of time series T (t), obtaining a series of transmission information B (i).It is a kind of base that essence, which is imaged, in time ghost
In the High order correletion imaging technique of fluctuation of optical field intensity characteristic, it is being used for optic communication, to compare conventional communication mode, realizes in receiving end
Point-to-point detection has preferable interference free performance.
In addition modulation system of the invention belongs to intensity modulated, not to the phase of carrier light source, frequency, polarization, amplitude etc.
It is modulated.Information after coding is loaded on light source, receiving end, the bucket detection of the no temporal resolution in receiving end are transferred to
Device receives, this barrel of detector can be avalanche diode.In addition, the sample rate of bucket detector can the low frequency with carrier wave light source
Rate, i.e. carrier frequency are 10Gb/s, and the sample frequency of that barrel of detector can be 1Gb/s.Because bucket detector itself is received
It is intensity value, is carried out without each value to carrier signal corresponding.
The step 4 is specifically, be decoded a series of transmission information B (i) that bucket detector receives, transmission letter
Breath shows the situation of normal distribution, as shown in Figure 3, it is clear that only from transmission information, effective information can not be got,
This has also ensured the safety of information.Transmission information B (i) is decoded with chaos light sequence I (t) with compressed sensing,
Tcs=arg min:| | T | |L1S.t.B=∫ dtI (t) T (t) (3)
TcsFor decoding and reconstituting information, T is time serial number, and L1 is L1 norm.The application of compressed sensing algorithm may be implemented
In the case that transmission information is less, the accurate reconstruct to signal is realized.Due in transmission process, by noise the problems such as is dry
It disturbs, the information after information and coding after demodulation can not be completely the same.Therefore, the present invention is using the difference method of average as threshold value
Judgment criteria for that is, 0 and 1 threshold decision, extracts the minimum value greater than 1 and the minimum value greater than 0 from the information of demodulation,
Assuming that respectively 0.05 and 1.21, both take the average as threshold value of difference, i.e., 0.58, it is judged as 0 when numerical value is less than 0.58,
When being greater than 0,58, further determine whether to be 1.And so on, it realizes and 0,1,2,3 threshold value is differentiated, complete pair signals
Demodulation reconstruct.Reconstruction result is as shown in Figure 4.
The step 5 is specifically, information after demodulated reconstruct, for the sequence constituted by 0,1,2,3, by channel
The encoded translated sequence to be made of 0 and 1, completes the transmission of information.
The above is only a preferred embodiment of the present invention, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of not departing from technical solution of the present invention, to the invention discloses technical solution and
Technology contents make the variation such as any type of equivalent replacement or modification, belong to the content without departing from technical solution of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (8)
1. a kind of optical communication method based on association in time imaging, which comprises the following steps:
Step 1: information source passes through channel coding, and the bit information of binary signal is encoded to form the letter being made of fourth gear signal
Breath；
Step 2: using chaos light as the carrier of information, the information after coding is loaded on carrier and is transmitted to receiving end；
Step 3: the receiving end is constituted using the bucket detector without temporal resolution, and the bucket detector reception is obtained through signal
Obtain signal light intensity information；
Step 4: signal light intensity information is demodulated through compressed sensing algorithm, is analyzed according to the relevant threshold value of fourth gear signal
Therefrom reconstruct the time series being made of fourth gear signal；
Step 5: time series is subjected to channel decoding, restores the bit information of binary signal.
2. the optical communication method according to claim 1 based on association in time imaging, which is characterized in that the information source is served as reasons
The binary sequence of 0 and 1 composition；It is to be divided the binary sequence of 0 and 1 composition by the information that fourth gear signal is constituted
Shelves, are encoded to 0,01 for 00 and are encoded to 1,10 and are encoded to 2,11 and be encoded to 3, constitute the information that time series is T (t).
3. the optical communication method according to claim 1 based on association in time imaging, which is characterized in that the chaos gloss
Use Logistic model that time series T (t) is loaded on chaos light sequence I (t) in transmission as the model of this paper, and
It is transferred to receiving end；Logistic mapping is indicated with following formula:
xn+1=μ xn(1-xn) (1)
Wherein, xnFor iteration initial value, and xn∈[0,1]；μ is system parameter, and μ ∈ [0,4]；When μ=4, Logistic mapping
Into full mapping status, which has great randomness.
4. the optical communication method according to claim 3 based on association in time imaging, which is characterized in that the bucket detector
What is received is to transmit the energy intensity value of information shown in following formula:
B=∫ dtI (t) T (t) (2)
By repeatedly to the transmission of time series T (t), obtaining a series of transmission information B (i).
5. the optical communication method according to claim 4 based on association in time imaging, which is characterized in that transmission information B (i)
Demodulated with chaos light sequence I (t) with compressed sensing, it is demodulated after time series indicated with following formula:
Tcs=arg min:| | T | |L1S.t.B=∫ dtI (t) T (t) (3)
Tcs is the information after demodulation, and T is time serial number, and L1 is L1 norm.
6. the method according to claim 5 based on association in time imaging, which is characterized in that step 5 further comprises:
Average value is found out as threshold value using the difference method of average to the information after demodulation, constitutes stimulus threshold criterion.
7. the method according to claim 2 based on association in time imaging, which is characterized in that demodulated in step 5
Information after reconstruct is converted into the sequence being made of 0 and 1 by channel coding for the sequence being made of 0,1,2,3 fourth gear signal
Column, complete the transmission of information.
8. a kind of optical communication system based on association in time imaging, including information source, channel and the stay of two nights, which is characterized in that described
Channel encoding unit, modulation unit, receiving end, demodulating unit and channel Gray code list are set gradually between information source and the stay of two nights
Member；The information source is connect with the channel encoding unit, and the output of the channel encoding unit is connect with the modulation unit, institute
It states modulation unit to load the information into chaos light, channel is transferred to receiving end, and receiving end connects the demodulating unit, through solving
The signal of tune is by the channel Gray code unit, and the channel Gray code unit is for being sent to the letter after going back prime information
Place.
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Application publication date: 20190730 |