CN110190923A - A kind of latent communication system and method based on non-cooperation blind source signal - Google Patents
A kind of latent communication system and method based on non-cooperation blind source signal Download PDFInfo
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- CN110190923A CN110190923A CN201910468549.6A CN201910468549A CN110190923A CN 110190923 A CN110190923 A CN 110190923A CN 201910468549 A CN201910468549 A CN 201910468549A CN 110190923 A CN110190923 A CN 110190923A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/03—Protecting confidentiality, e.g. by encryption
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of latent communication system and method based on the blind source of non-cooperation, latent communication system include: that information coding and transmitting terminal, information receive and demodulating end and non-cooperation blind source signal；Using the blind source of non-cooperation as communication carrier, using double antenna or multiple antennas as receiving end, and the electromagnetic wave received is demodulated in receivers, to realize hided transmission and the passive transmission communication of information.Using technical solution of the present invention, it is not necessarily to signal emitting-source, carrier wave transmission power is saved, is not take up new frequency spectrum resource；Circuit structure is simplified, hardware cost is reduced；Covert communications have been ensured, it can be achieved that indoor orientation fixed service in physical layer；Information can be also sent to the sensor of the specific position in Internet of Things, energy is provided for RFID tag, improve radio communication quality.
Description
Technical field
The present invention relates to hidden, passive, passive, latent fields of communication technology, more particularly to one kind to be based on the blind source of non-cooperation
The latent communication system and method for signal are using field-programmable Meta Materials as transmitter important component, in space
The electromagnetic signals such as ubiquitous Wi-Fi, bluetooth, GPS are the passive communication mode of carrier wave.
Background technique
Currently, the modulation demodulation system that existing system uses is needed modulates baseband signals to load in wireless communication field
On wave.And to improving transmission rate and reducing the bit error rate, realize that normal communication efficiency and raising communication quality just have to
Consider the signal-to-noise ratio of raising system.Signal-to-noise ratio is improved at present there are three major routes, is improved carrier power and is reduced receiver and makes an uproar
Sonic system number, or exchange using spread spectrum communication etc. the particular modulation scheme of high s/n ratio for broadband.Improve carrier power this
Method is often limited to the amplifier performance of transmitter.And body effect is still not clear in electromagnetic radiation, for security consideration,
There is stringent limitation in country to the electromagnetic wave power of the transmitter transmitting in business communication system.Carrier power can not continue to lift up
Through a urgent problem to be solved for becoming current Communication System Design.A series of communication standards including 5G communication at present
In, the power consumption of transmitter depends on the power of transmitting carrier signal.Carrier frequency is higher and higher, and spectral occupancy is increasing,
The number of transmitter is more and more.How by power consumption control within an acceptable range, have become current Internet of Things, wireless sensing
One, the fields such as device, mobile communication, wearable device, industrial Informationization Manufacture are difficult to overcome the problems, such as.Existing wireless communication
There are all various deficiencies for systems technology.
The prior art, which is difficult to realize transmission power reduction, also can be carried out efficient communication.In order to improve noise, existing communication
System mostly uses greatly spread spectrum communication etc. to exchange the particular modulation scheme of high s/n ratio for broadband, causes originally and its valuable
Frequency spectrum resource becomes more crowded.Following communication technology is forced constantly to extend to higher frequencies sections such as millimeter waves even Terahertz,
However higher frequency range means the exponential increase of hardware cost.Transmitter in existing communication system needs to utilize mixing
Device and power amplifier realize modulates baseband signals demodulation, and the hardware cost of communication system is larger.
With the development of internet and cyberspace safety, covert communications have become a kind of heavy of information encryption transmission
Want mode.The reception terminal in the source and information that generate as information, the Covert Communication Technology of the interior space are it in weight
Weight.Covert communications, which refer to for confidential information to be hidden in a large amount of public informations, to be transmitted, and the extremely difficult perception road of unauthorized person is hidden
The presence of information, to substantially increase the safety of information.Existing Covert Communication Technology is broadly divided into time domain and (bursts logical
Letter), airspace (space division multiplexing communication mode and the beam communication etc. realized by the Beamforming technology of array antenna), frequency domain
(spread spectrum technic makes signal power make an uproar to be difficult to be noticeable less than signal bottom) three directions.Still lack for interior at present
The effective means of covert communications, it is difficult to which realization carries out on the transmission mechanism of information, transmission mode, transmission channel and transmission spectrum
Encrypted transmission.
In the internet of things era, RFID label tag is because its is small in size and does not need the passive passive communication technical advantage of power supply power supply
It is widely used in daily life (such as campus card, subway card etc. " all-purpose card " technology), RFID label tag realizes quilt
Dynamic communication pattern key is that card reader is that near-field communication provides energy, and label itself then utilizes itself coil and variable resonant circuit
Realization carries out load modulation to the carrier wave received.This technology is only to serve as the side for receiving information in communicating pair
Realize " passive " concept.And communication distance is limited in electromagnetic wave near field range in current RFID technique, communication terminal
Quantity be also limited to one-to-one communication.The prior art is difficult to realize transmitter and receiver really passive passive communication,
The message capacity and communication distance of existing RFID technique are limited, and one-to-many communication is limited.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of non-conjunctions based on field-programmable Meta Materials
Make the latent communication system in blind source and its method.The present invention is not necessarily to signal emitting-source, saves carrier wave transmission power, is not take up new
Frequency spectrum resource；Circuit structure is simplified, hardware cost is reduced；Covert communications have been ensured, it can be achieved that indoor fixed in physical layer
To fixed service；Also information can be sent to the sensor of the specific position in Internet of Things, provide energy for RFID tag, change
Kind radio communication quality.
Communication system of the invention is using based on FPGA, (Field-Programmable Gate Array, i.e. scene can
Program gate array) field-programmable Meta Materials as message sink coding component, by random electromagnetic ubiquitous in space environment
Signal (signals such as WI-FI signal, bluetooth, cellphone GPS) is used as communication carrier, using double antenna or multiple antennas as receiving end,
And in receivers demodulated the modulated electromagnetic wave received using Analysis of Statistical Signal algorithm, to realize passive, quilt
Dynamic, hidden and orientation communication.Compared with existing communication system, the present invention eliminates signal emitting-source, saves carrier wave transmitting
Power.The information of this system transmitting directly modulates existing random electromagnetic signal in the environment, and the carrier wave that can not extract is special
Special demodulation method is levied and needed, has ensured covert communications in physical layer.Because of the electromagnetic wave of programmable Meta Materials reflection
Direction is controllable, and the variation using electromagnetic wave phase is needed in demodulation mode, indoor orientation fixed service may be implemented.In addition to hidden
Except the characteristics of communication, the present invention can also send information to the sensor of the specific position in Internet of Things, can also know for radio frequency
Distinguishing label provides energy, can also improve radio communication quality.It can be in the information peace of following military safety-security area, cyberspace
The full fields such as field and smart home, Internet of Things obtain broad application.
The technical solution adopted in the present invention is as follows:
A kind of latent communication system based on the blind source of non-cooperation, comprising: information coding and transmitting terminal, information are received and demodulated
End and non-cooperation blind source signal；It is specific as follows:
Information coding and transmitting terminal include transmitting terminal server (host), field-programmable Meta Materials and FPGA control panel.
Wherein, transmitting terminal server is generated for asymmetric encryption, message sink coding, Meta Materials control signal；Field-programmable Meta Materials
It is a kind of aerial array, including mutiple antennas unit；The electromagnetic property of each antenna element can have different state changes, different
Unit different conditions generate different coding, for regulating and controlling the electromagnetic wave in space；FPGA control panel is for receiving transmitting terminal clothes
Business device (host) controls data, according to the state of the control data switching each unit of field-programmable Meta Materials；Transmitting terminal service
Device (host) is connected to FPGA control panel by serial ports, and FPGA control panel is connected to field-programmable Meta Materials by parallel bus
Each unit.
It includes: two directional aerials, low-noise amplifier, bandpass filter, oscillograph or ADC that information, which is received with demodulating end,
(above section combines capture and signal condition of the realization to electromagnetic wave signal) and receiving end server (slave)；Its
In, receiving end server includes sampling judging module, source coding module, cross-correlation calculation module, asymmetric deciphering module；Letter
Breath is received uses two-way antenna to add amplifier that oscillograph is added directly to be mixed with 10Gsa/s sample rate or use with demodulating end
Amplified signal and 2.4Ghz microwave source are carried out down coversion by device, carry out low sampling rate again after filtering out inband signaling by filter
Sampling；
Non- cooperation blind source signal refers to the random electromagnetic signal for carrying out be completely independent work relative to communication system；Including but not
It is limited to the random WI-FI signal source in daily life, bluetooth, mobile communication signal, the public frequency in the world for working in 2.4/5G
The equipment etc. of section.
Information coding and transmitting terminal rely on the electromagnetic property of Meta Materials, regulate and control to the electromagnetic wave in space.Information is compiled
For code with transmitting terminal, the field-programmable Meta Materials used are the Meta Materials of the matrix of a N*N, have 2N*NA different volume
Code mode (pattern), (signal-to-noise ratio and directional properties in this communication system, information receive and are used to distinguish not in demodulating end
With symbol decision threshold value and judgement accuracy rate all by the restriction of N).Theoretically, each pattern represent one it is polynary
Code, each multi-element code represent n=log2L binary number, L are N*N i.e. array element numbers.But according to practical communication system
Indexs, the multicomponent codings such as cost requirement, the limitation of transmitter receiver performance and system signal noise ratio do not need to reach theoretical pole
It limits, a pair of pattern corresponding with " 0 " and " 1 " two logical values can be obtained according to environment optimization in actual use.
When it is implemented, information is received with decoding end, two directional aerials are respectively with different direction into reception space
Electromagnetic wave after it may be programmed Meta Materials regulation, and convert microwave signal for electromagnetic wave and transmitted backward through coaxial line.Microwave
Signal passes through low-noise amplifier and bandpass filter, and available signal is extracted amplification.Oscillograph ADC binary channels while reality
When sample, the information of the N number of point of single triggering collection, triggering the period be fixed as T, continuous trigger simultaneously saves data L times.Receiving end clothes
Business device reads the data that oscillograph saves, and carries out computing cross-correlation, draws amplitude and phase figure, according to the phase of dualization point
The phase threshold of the sampling decision device of cloth training receiving end server.Sampling decision device is for making decisions to obtain binary data
Stream.The sampling decision device of receiving end server carries out constant duration sampling；Error correcting code error correction and asymmetric decryption are carried out, then will
Obtained binary data is converted, and encryption information is demodulated.
Cooperated using above-mentioned latent communication system based on the blind source of non-cooperation, can be realized information hided transmission and
Passive transmission.When it is implemented, WI-FI signal can be used in the non-blind source of cooperation.Based on the passive of the blind source of non-cooperation (WI-FI signal)
Concealed communication method includes the following steps:
One, transmitting terminal server (host) is connected to FPGA control panel by serial ports, FPGA control panel passes through parallel total
Line is connected to each unit of field-programmable Meta Materials, configuration information coding and transmitting terminal.Information coding and transmitting terminal work
Process is as follows:
1) user is configured on the server (host) of information coding and transmitting terminal, selects secret number to be sent
According to, and setting information frame sends interval, information frame length, check bit digit, Transmit Bit Rate, programmable Meta Materials coding switching
The information such as cycle time T, pass through server (host) and control programmable Meta Materials.
2) confidential data is carried out asymmetric encryption by server.
3) encrypted data progress message sink coding (error correcting code coding) is obtained baseband signal by server.
4) baseband signal is divided into data frame by server, and addition frame head synchronizing sequence coding automatically, is obtained
Binary data stream.
5) information (binary data stream) that server will be obtained through above step, according to programmable Meta Materials battle array
Column unit quantity and shift register data flow direction be converted to information programmable by matrix transposition and matrix slice
Meta Materials encode (binary data stream) required for working normally.' 1 ' corresponding one group of programmable Meta Materials encode pattern,
' 0 ' corresponding another group of pattern.
6) relevant parameter that server is arranged according to step 1), can be with by programmable Meta Materials by corresponding timing
The coding (data flow) of identification is sent to FPGA control panel by serial ports.
7) FPGA control panel receives the data flow that server end is sent by serial ports, and interprets programmable Meta Materials coding
The cycle time T of switching.
8) FPGA control panel controls the switching that programmable Meta Materials carry out two kinds of difference pattern with cycle T, realizes to sky
Between middle electromagnetic field regulation.
Two, information is received adds amplifier that oscillograph is added directly to sample or use frequency mixer with demodulating end using two-way antenna
Amplified signal and microwave source are subjected to down coversion, carry out low sampling rate sampling again after filtering out inband signaling by filter；It is logical
It crosses receiving end server and is sampled judgement, source coding, cross-correlation calculation, asymmetric decryption；Information receives and demodulating end
Workflow is as follows:
1) two directional aerials respectively with different direction into reception space through may be programmed Meta Materials regulation after electromagnetism
Wave, and convert microwave signal for electromagnetic wave and transmitted backward through coaxial line.
2) microwave signal passes through low-noise amplifier and bandpass filter, and available signal is extracted amplification.
3) real-time sampling, the information of N number of point of single triggering collection are time domain data x to oscillograph ADC binary channels simultaneously1 i
(t), x2 i(t) (t ∈ { 1, N }, i ∈ { 1, L }), t is sampling time variable；The triggering period is fixed as T, and continuous trigger simultaneously saves number
According to L times.
4) receiving end server reads the data that oscillograph saves, and contains N number of information of voltage for what two channels were adopted
L group time domain data x1 i(t), x2 i(t) (t ∈ { 1, N }, i ∈ { 1, L }) transforms to frequency domain xi(t)→Xi(f), two channel values exist
Frequency point fsThe mutually multiplied Y of complex valuesi(fs)=X1 i(fs)·X2 i(fs), the Y that will be obtainedi(fs) (i ∈ { 1, L }), fsFrequency is represented,
L is identical as sense discussed above, draws amplitude and phase figure as shown in Fig. 2, according to the phase distribution of dualization training sampling decision device
Phase threshold Pth(P ∈ {-Π ,+Π }), wherein be the value range of threshold value in bracket.
5) the sampling decision device of receiving end server is according to obtained phase threshold PthTo Yi(fs) (i ∈ { 1, N }) progress
Judgement, obtains binary data stream Di(i ∈ { 1, L }).
6) the sampling decision device of receiving end server is according to time domain data x1 i(t), x2 i(t) when i-th of data is corresponding in
Between labelIt carries out data time interval to adjust again, obtains Di(i ∈ { 1, L }), to guarantee Yi(fs) (i ∈ { 1, L }) approximation etc.
Effect is that constant duration samples.Time tag is carried by oscillograph acquisition data.
7) the sampling decision device of receiving end server determines sampling homing sequence label i using synchronizing frame headstart, and to Di
(i ∈ { 1, L }) (for example, can be using 5 symbols as a cycle) be sampled judgement and obtain binary data stream Mn(n ∈ 1,
K }, K≤L), symbol is adjudicated marked as in=istart+ p*n (n ∈ { 1, K }).
8) to Mn(n ∈ { 1, K }) carries out error correcting code error correction and asymmetric decryption, obtain binary data, then will obtain
Binary data is converted, and encryption information can be demodulated.
Wherein, information receive the decode end use before need first to calibrate reception end position, optimization Meta Materials coding is connecing
After fixation is set in receipts seat in the plane, the electromagnetic wave signal in environment is also at a steady random state, it would be desirable to be directed to receiver
The position of two antennas carries out complex optimum to pattern, makes electromagnetic field while focusing on two antennas of receiver, with
For BPSK modulation system, when switching between two different pattern of representative ' 0 ' and ' 1 ', two antennas of receiver are received
Amplitude to signal should be roughly the same, and counted phase difference should have the variation of 180 degree after the signal that receiver receives is related.
The bit error rate could be controlled in a reasonable range in this way.
Compared with prior art, the beneficial effects of the present invention are:
The invention proposes a kind of latent system and methods based on non-cooperation blind source signal；The present invention has following excellent
Point:
(1) the programmable Meta Materials modulation technique of use site of the present invention believes that transmitter completely without carrier wave is sent
Number (the main energy consumption reason of transmitter) makes transmitter power consumption depend entirely on the energy of logical device switch motion consumption, will
The several orders of magnitude of communication system lower power consumption, have gone beyond energy consumption problem in existing wireless communications technology.Present invention reduces logical
The energy consumption of news system thereby reduces the cost of communication system.Reduce transmission power, in this embodiment it is not even necessary to which oneself sends carrier signal
It just can be carried out communication, huge power cost will be saved.
(2) method proposed by the present invention does not occupy new frequency spectrum resource additionally, solves frequency spectrum resource occupation problem.Pole
Valuable frequency spectrum resource has been saved greatly.The present invention does not emit carrier signal actively, but by the information coding for needing to transmit to now
On field programmable Meta Materials, different symbols corresponds to the reflection coefficient of one group of different metamaterial units, existing WI- in space
The signals such as FI have partial dispersion field and are irradiated on field-programmable Meta Materials to generate the high-frequency signal modulated, and are equivalent to
The up-conversion of baseband signal is realized using signal source unknown in environment and being randomly generated.It is directly adopted when reception with oscillograph
Sample, or directly demodulated the modulated signals such as the WI-FI propagated in space using technologies such as SDR (software-defined radios)
Baseband signal is to interpret the information of transmission.The advantage that this method had both remained modulation /demodulation in existing communication mode (is received
Hair antenna volume is small, and fading channel is small, availability of frequency spectrum height etc.), and increase a new information transmitting dimension.
(3) present invention greatly simplify the structure of traditional transmitter, reduce system structure complexity and hardware at
This, improves the integrated level and digitized degree of communication system hardware part, has bright application in fields such as smart homes
Prospect.The third technical problem that the present invention solves is reduction of the structure complexity of system, this communication system can using scene
Meta Materials are programmed, directly in the electromagnetic signal that modulates baseband signals are ubiquitous into real life, such as WI-FI signal.
Instead of transmitter in conventional communication system, do not need to can be achieved with modulates baseband signals using frequency mixer and power amplifier
Demodulation, has greatly saved the hardware cost of communication system.
(4) the invention proposes a kind of new latent, covert communications realization approach, latent, covert communications are realized.It will
Confidential information concealment is universal due to WI-FI signal on the open public frequency band electromagnetic wave such as ubiquitous WI-FI signal
Property, WI-FI signal transmit in the channel after randomness, cracker is difficult to extract in the information of such large redundancy useful
Information.Cooperate the asymmetric encryption mode in information security, in the transmission mechanism of information, transmission mode, transmission channel and transmission
Encrypted transmission is realized on frequency spectrum, substantially increases the safety of indoor confidential information transmission.
(5) information coding proposed by the present invention and the passive passive communication technology of transmitting terminal, i.e., information is compiled in communication process
Code does not generate carrier signal with transmitting terminal；Compared to RFID label tag passive communication technology, transmitter and reception are really realized
The passive passive communication of machine.It, can be with using with the field-programmable Meta Materials to the focusing capability of electromagnetic beam in the present invention
RFID passive communication technology combines, and by the energy centralization to RFID label tag of server-side transmitting, can be realized transmitter and connects
The real passive passive communication of receipts machine, and then the message capacity and communication distance of existing RFID technique are greatly improved, it realizes a pair of
Multi-pass letter.
(6) communication system uses the modulation means such as similar BPSK, and using phase information as criterion, signal-to-noise ratio is high, is not easy
It is influenced by changes in channel characteristics, communication anti-interference capability is strong.
(7) core component uses field-programmable Meta Materials, and switching coding rate is fast, and traffic rate is high, message capacity
Greatly.
It (eight) is also wearable device and Internet of Things because field-programmable Meta Materials have the focusing capability to electromagnetic beam
The power supply of the terminals such as the wireless sensor in net and smart home provides a kind of new solution.
Detailed description of the invention
Fig. 1 is communication system block diagram of hiding the present invention is based on the blind source of non-cooperation of WI-FI signal；
Fig. 2 is that the present invention is based on the flow diagrams of the demodulating process of the latent communication means in the blind source of non-cooperation of WI-FI signal；
Fig. 3 is that communication system is hidden using hardware component in the blind source of non-cooperation based on WI-FI signal in the embodiment of the present invention
Schematic diagram.
Specific embodiment
With reference to the accompanying drawing, the present invention, the model of but do not limit the invention in any way are further described by embodiment
It encloses.
The present invention provides a kind of latent communication system and communication means based on the blind source of non-cooperation, and system includes: that information is compiled
Code receives and demodulating end and non-cooperation blind source signal with transmitting terminal, information.The present invention is using the blind source of non-cooperation as communication carrier, benefit
It uses double antenna or multiple antennas as receiving end, and in receivers demodulates the electromagnetic wave received, to realize information
Hided transmission and passive transmission communication.
Embodiment one
In the present embodiment, the latent communication system block diagram in the blind source of non-cooperation based on WI-FI signal is as shown in Figure 1.It is based on
The latent communications system demodulation process in the blind source of non-cooperation of WI-FI signal is as shown in Figure 2.Wherein, based on the non-cooperation of WI-FI signal
The latent communication system information coding in blind source sends information as shown in Fig. 2 Far Left with transmitting terminal, and information receiving end finally decodes letter
Breath is as shown in the middle section Fig. 2.
In this example, hide in the blind source of non-cooperation based on WI-FI signal device such as Fig. 3 institute used in communication system real
Show.
The latent communication system in the blind source of non-cooperation based on WI-FI signal includes following three groups in this example as shown in Figure 3
At part:
(1) information coding and transmitting terminal
1, comprising a server (host), programmable Meta Materials and FPGA control panel.Information coding and transmitting terminal work
Process is as follows
1) user selects confidential data to be sent, and setting information frame sends interval, information frame length, check bit position
Number, Transmit Bit Rate may be programmed the information such as the cycle time T of Meta Materials coding switching.
2) confidential data is carried out asymmetric encryption by server.
3) encrypted data progress message sink coding (error correcting code coding) is obtained baseband signal by server.
4) baseband signal is divided into data frame by server, and addition frame head synchronizing sequence coding automatically.
5) information (binary data stream) that server will be obtained through above step, according to programmable Meta Materials battle array
Column unit quantity and shift register data flow direction be converted to required for programmable Meta Materials normal work to information
Coding (binary data stream).' 1 ' corresponding one group of programmable Meta Materials encode pattern, ' 0 ' corresponding another group of pattern.
6) relevant parameter that server is arranged with step 1 can be known programmable Meta Materials by corresponding timing
Other coding is sent to FPGA control panel by serial ports.
7) FPGA control panel receives the data flow that server end is sent by serial ports, and interprets programmable Meta Materials coding
The cycle time T of switching.
8) FPGA control panel controls the switching that programmable Meta Materials carry out two kinds of difference pattern with cycle T.
(2) information reception and demodulating end
2, there are two types of hardware implementation modes for receiver in the present invention
1) two-way antenna is used to add amplifier that oscillograph is added directly to sample with 10Gsa/s.
2) amplified signal and 2.4Ghz microwave source are subjected to down coversion using frequency mixer, are filtered out by filter with interior letter
Low sampling rate sampling is carried out after number again.
3, information receives as follows with the workflow of demodulating end
1) two (orientation) antennas and respectively with different direction into reception space after programmable Meta Materials regulation
Electromagnetic wave, and convert microwave signal for electromagnetic wave and transmitted backward through coaxial line.
2) microwave signal passes through low-noise amplifier and bandpass filter, and available signal is extracted amplification.
3) oscillograph binary channels is simultaneously with 10GSa/s sample rate real-time sampling, N=1000 point of single triggering collection
Information x1 i(t), x2 i(t) (t ∈ { 1, N }, i ∈ { 1, L }), triggering period are fixed as T=40ms, and continuous trigger simultaneously saves data L
=1000 times.
4) receiving end server reads the data that oscillograph saves, and carries out computing cross-correlation, the Y that will be obtainedi(fs)(i∈
{ 1, L }) amplitude and phase figure is drawn as shown in Fig. 2, according to the phase threshold of the phase distribution of dualization training sampling decision device
Pth(P ∈ {-Π ,+Π }).
5) the phase threshold P that the sampling decision device partial code of receiving end server is obtained according to step 4thTo Yi(fs)(i
∈ { 1, N }) it makes decisions to obtain binary data stream Di(i ∈ { 1, L }).
6) the sampling decision device partial code of receiving end server is according to time domain data x1 i(t), x2 i(t) i-th of data in
Corresponding time tag ti, carry out data time interval and adjust to obtain D againi(i ∈ { 1, L }), to guarantee Yi(fs) (i ∈ { 1, L })
Approximate Equivalent is constant duration sampling.
7) the sampling decision device partial code of receiving end server determines sampling homing sequence label using synchronizing frame head
istart, and be a cycle to D using 5 symbolsi(i ∈ { 1, L }) is sampled judgement and obtains binary data stream Mn(n ∈ 1,
K }, K=100), symbol is adjudicated marked as in=istart+ 5*n (n ∈ { 1, K }).
8) to Mn(n ∈ { 1, K }) carries out error correcting code error correction and asymmetric decryption, then obtained binary data is turned
It changes, the black and white encryption information that a resolution ratio is 10 × 10 can be demodulated.
(3) non-cooperation blind source signal
Non- cooperation blind source signal refers to the random electromagnetic signal for carrying out be completely independent work relative to communication system.Including but
The random WI-FI signal source that is not limited in daily life, bluetooth, mobile communication signal, work in 2.4/5G the world it is public
The equipment etc. of frequency range.
Three component parts, which cooperate, can be realized the hided transmission and passive transmission of information.
It is finally noted that the purpose for publicizing and implementing example is to help to further understand the present invention, but this field
Technical staff be understood that without departing from the spirit and scope of the invention and the appended claims, it is various replacement and repair
It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is to weigh
Subject to the range that sharp claim defines.
Claims (9)
1. a kind of latent communication system based on the blind source of non-cooperation, comprising: information coding and transmitting terminal, information receives and demodulating end
With non-cooperation blind source signal；It is characterized in that:
The information coding and transmitting terminal include transmitting terminal server, field-programmable Meta Materials and FPGA control panel；Wherein, it sends out
Sending end server is generated as host for asymmetric encryption, message sink coding, Meta Materials control signal；The super material of field-programmable
Material is the aerial array for including mutiple antennas unit, regulates and controls the electromagnetic wave in space；FPGA control panel is for receiving transmitting terminal clothes
The control data of business device, according to the state of the control data switching each unit of field-programmable Meta Materials；Transmitting terminal server is logical
It crosses serial ports and is connected to FPGA control panel, FPGA control panel is connected to each list of field-programmable Meta Materials by parallel bus
Member；The field-programmable Meta Materials are the Meta Materials of the matrix of N*N, have 2N*NA different coding mode, each coding
Mode represents a multi-element code, and each multi-element code represents n=log2L binary number, L are N*N i.e. array element numbers；
The information is received with demodulating end
Receiving end server, including sampling decision device, source decoder, cross-correlation calculation device and symmetric decryptor；
Two directional aerials, low-noise amplifier, bandpass filter, oscillograph or ADC, for electromagnetic wave signal capture and
Signal condition；
Two directional aerials are used for the electromagnetic wave with different direction into reception space after it may be programmed Meta Materials regulation respectively,
And microwave signal is converted by electromagnetic wave and is transmitted backward through coaxial line；Microwave signal passes through low-noise amplifier and bandpass filtering
Available signal is extracted amplification by device；Oscillograph ADC binary channels while real-time sampling, the letter of the N number of point of single triggering collection
Breath, fixed triggering period continuous trigger simultaneously save data L times；Receiving end server reads the data that oscillograph saves, and carries out
Computing cross-correlation draws amplitude and phase figure, the phase threshold of the sampling decision device of training receiving end server；Sampling decision device
For making decisions to obtain binary data stream；The sampling decision device of receiving end server carries out constant duration sampling；It carries out
Error correcting code error correction and asymmetric decryption, then obtained binary data is converted, demodulate encryption information；
The non-cooperation blind source signal is the random electromagnetic signal for being completely independent work, including but not limited to WI-FI signal source, indigo plant
Tooth, mobile communication signal, international public frequency band device signal.
2. the latent communication system as described in claim 1 based on the blind source of non-cooperation, characterized in that the latent communication system
Multicomponent coding is optimized for a pair of of coding mode.
3. the latent communication system as described in claim 1 based on the blind source of non-cooperation, characterized in that field-programmable Meta Materials
In aerial array, the electromagnetic property of each antenna element has different state changes, and different units different conditions generate different volumes
Code.
4. a kind of collaboration working method of the latent communication system based on the blind source of non-cooperation is carried the blind source of non-cooperation as communication
Wave using double antenna or multiple antennas as receiving end, and in receivers demodulates the electromagnetic wave received, to realize
The hided transmission and passive transmission of information communicate；Include the following steps:
One, transmitting terminal server is connected to FPGA control panel by serial ports, FPGA control panel is connected to by parallel bus
Each unit of field-programmable Meta Materials, configuration information coding and transmitting terminal；Information coding is performed the following operations with transmitting terminal:
1) transmitting terminal server is configured on transmitting terminal server as host, selects confidential data to be sent, and set
Parameter information is set, field-programmable Meta Materials are controlled by transmitting terminal server；
2) confidential data is carried out asymmetric encryption by transmitting terminal server；
3) encrypted data is carried out message sink coding by transmitting terminal server, obtains baseband signal；
4) baseband signal is divided into data frame by transmitting terminal server, and automatically addition frame head synchronizing sequence coding, obtain two into
Data flow processed；
5) binary data stream that transmitting terminal server obtains step 4), according to programmable Meta Materials array element quantity and shifting
Bit register data flow converts information by matrix transposition and matrix slice, and obtained binary data stream is can
Program coding required for Meta Materials；
6) parameter information that transmitting terminal server is arranged according to step 1), the data for identifying programmable Meta Materials by corresponding time sequence
Stream encryption is sent to FPGA control panel by serial ports；
7) FPGA control panel receives the data flow that server end is sent by serial ports, and interprets programmable Meta Materials coding switching
Cycle time；
8) FPGA control panel controls the period switching that programmable Meta Materials carry out different coding mode, realizes to electromagnetic field in space
Regulation；
Two, it includes receiving end server that information, which is received with demodulating end,；Two directional aerials, low-noise amplifier, bandpass filter,
Oscillograph or ADC；Information receive with demodulating end use two-way antenna add amplifier to add oscillograph directly samples or use is mixed
Amplified signal and microwave source are carried out down coversion by device, carry out low sampling rate sampling again after filtering out inband signaling by filter；
Judgement, source coding, cross-correlation calculation, asymmetric decryption are sampled by receiving end server；It performs the following operations:
1) two directional aerials respectively with different direction into reception space through may be programmed Meta Materials regulation after electromagnetic wave, and
Microwave signal is converted by electromagnetic wave to transmit backward through coaxial line；
2) microwave signal passes through low-noise amplifier and bandpass filter, and available signal is extracted amplification；
3) real-time sampling, the information of N number of point of single triggering collection are time domain data x to oscillograph ADC binary channels simultaneously1 i(t), x2 i
(t) (t ∈ { 1, N }, i ∈ { 1, L }), triggering period are fixed as T, and continuous trigger simultaneously saves data L times；
4) receiving end server reads the data that oscillograph saves, and the L group containing N number of information of voltage that two channels are adopted
Time domain data transforms to frequency domain: xi(t)→Xi(f), by two channel values in frequency point fsComplex values be multiplied to obtain Yi(fs), i ∈ 1,
L }, fsRepresent frequency；According to Yi(fs) amplitude and phase figure is drawn, according to the phase threshold of phase distribution training sampling decision device
Pth；
5) the sampling decision device of receiving end server is according to obtained phase threshold PthTo Yi(fs) make decisions, obtain binary system
Data flow Di(i ∈ { 1, L })；
6) the sampling decision device of receiving end server is according to time domain data x1 i(t), x2 i(t) the corresponding time mark of i-th of data in
LabelIt carries out data time interval to adjust again, obtains Di(i ∈ { 1, L }), so that Yi(fs) (i ∈ { 1, L }) be approximately the equal times
Interval sampling；
7) the sampling decision device of receiving end server determines sampling homing sequence label i using synchronizing frame headstart, and to Di(i∈
{ 1, L }) it is sampled judgement, obtain binary data stream Mn(n ∈ { 1, K }, K≤L) adjudicates symbol marked as in=istart+
P*n (n ∈ { 1, K })；
8) to Mn(n ∈ { 1, K }) carries out error correcting code error correction and asymmetric decryption, obtains binary data, then the binary system that will be obtained
Data are converted, that is, demodulate encryption information；
Through the above steps, the collaborative work of the latent communication system based on the blind source of non-cooperation is realized.
5. the collaboration working method of the latent communication system as claimed in claim 4 based on the blind source of non-cooperation, characterized in that step
4) in, by two channel values in frequency point fsComplex values be multiplied indicate are as follows: Yi(fs)=X1 i(fs)·X2 i(fs)；According to phase distribution
The phase threshold P of training sampling decision devicethSpecially Pth(P ∈ {-Π ,+Π }), wherein {-Π ,+Π } is the value of threshold value
Range.
6. the collaboration working method of the latent communication system as claimed in claim 4 based on the blind source of non-cooperation, characterized in that described
The non-blind source of cooperation is the random electromagnetic signal for being completely independent work, including but not limited to WI-FI signal source, bluetooth, mobile communication
With signal, international public frequency band device signal.
7. the collaboration working method of the latent communication system as claimed in claim 4 based on the blind source of non-cooperation, characterized in that information
Receiving end and decoding end use preceding first calibration reception end position, optimization Meta Materials coding；After receiver location is fixed, in environment
Electromagnetic wave signal be in a steady random state.
8. the collaboration working method of the latent communication system as claimed in claim 4 based on the blind source of non-cooperation, characterized in that be directed to
The position of two antennas of receiver optimizes coding mode, so that electromagnetic field focuses on two antennas of receiver simultaneously
On.
9. the collaboration working method of the latent communication system as claimed in claim 4 based on the blind source of non-cooperation, characterized in that specific
Ground, information is received to be used two-way antenna that amplifier is added to add oscillograph directly with 10Gsa/s sample rate or to make with demodulating end
Amplified signal and 2.4Ghz microwave source are subjected to down coversion with frequency mixer, filtered out by filter carried out after inband signaling again it is low
Sample rate.
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