CN108632816A - Safety of physical layer communication means and device based on time reversal technology - Google Patents
Safety of physical layer communication means and device based on time reversal technology Download PDFInfo
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- CN108632816A CN108632816A CN201810324403.XA CN201810324403A CN108632816A CN 108632816 A CN108632816 A CN 108632816A CN 201810324403 A CN201810324403 A CN 201810324403A CN 108632816 A CN108632816 A CN 108632816A
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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
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
- H04L9/0875—Generation of secret information including derivation or calculation of cryptographic keys or passwords based on channel impulse response [CIR]
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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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Abstract
A kind of safety of physical layer communication means and device based on time reversal technology provided in an embodiment of the present invention, applied to the signal sending end in communication system, according to the channel information in each path communicated with intended recipient end, using time reversal technology, the noise signal for being 0 in preset time point is obtained；The noise signal is superimposed in signal to be transmitted, coded signal is obtained；The coded signal is sent to intended recipient end.So that intended recipient end, when preset time point collects coded signal, noise is 0 in coded signal；And illegal receiving terminal is because of the difference of channel information and intended recipient end, no matter when coded signal is acquired, noise signal in coded signal is not 0, therefore, illicit reception end can be interfered by noise signal and can not identify signal to be transmitted from the coded signal of acquisition, to realize the secure communication under the shielding of time domain AN signals.
Description
Technical field
The present invention relates to fields of communication technology, are communicated more particularly to a kind of safety of physical layer based on time reversal technology
Method and device.
Background technology
With the development of the communication technology, people can not be limited by the region of conventional wireline communication system, pass through channel radio
Letter system quickly and conveniently transmits various information.Wireless communication technique is by the electromagnetic transmission communication information, and electromagnetic wave can
The listener-in that can be not belonging to communicating pair collects, thus there are the risks that the communication information is stolen hearer's eavesdropping.For this purpose, logical
It is often securely communicated using wireless communication system physical layer characteristic, takes precautions against eavesdropping risk.
The common safety of physical layer communication technology includes beamforming technique, by the space point for optimizing transmitted signal
Cloth enhances the channel quality of target user and inhibits the channel quality of listener-in, listener-in is avoided to collect the communication information.Example
Such as, the signal alignment target user for being sent to target user is avoided listener-in by transmitting terminal by multi-antenna beam figuration；Or
Person, transmitting terminal is by interfering alignment techniques that will be sent to the space except the signal alignment to listener-in's signal space of target user
To avoid listener-in.But when using the above method, in order to by transmitted signal alignment target user and avoid listener-in,
Transmitting terminal needs to obtain the channel state information (Channel State Information, abbreviation CSI) of user and listener-in.
When listener-in is more hidden, the CSI that will cause transmitting terminal that can not get listener-in also just cannot achieve secure communication.
In order to cope with the above problem, in corresponding technology, pass through spatial domain man made noise (Artificial Noise, referred to as
AN) signal shielding technology realizes secure communication.Specifically, transmitting terminal transmits signal to be transmitted in subscriber signal space, with
AN signals are sent except the signal space of family, any listener-in that may be present of active interference inhibits its receptivity, makes listener-in
The communication information can not be obtained from collected signal, to realize secure communication.
But if listener-in possesses mutiple antennas, or there are the days that multiple listener-ins combine eavesdropping and joint eavesdropping
Line total number is more than the transmission antenna number of transmitting terminal, and AN signals biography can be calculated in listener-in by enough antennas
Defeated matrix, to completely eliminate AN signals according to the matrix.Therefore, AN signals in spatial domain screen technology when for secure communication,
Still remain the risk being ravesdropping.
Invention content
The embodiment of the present invention be designed to provide a kind of safety of physical layer communication means based on time reversal technology and
Device, with realize securely communicated using the shielding of time domain AN signals, avoid traditional AN signals shielding technology for safety lead to
The risk being ravesdropping when letter.Specific technical solution is as follows：
In a first aspect, an embodiment of the present invention provides a kind of safety of physical layer communication means based on time reversal technology,
This method includes：
Obtain the channel information in each path communicated with intended recipient end；
Noise signal is obtained, noise signal is in preset time using time reversal technology according to the channel information in each path
Point is 0；
Noise signal is superimposed in signal to be transmitted, coded signal is obtained；
The coded signal is sent to intended recipient end.
Second aspect, an embodiment of the present invention provides a kind of safety of physical layer communication device based on time reversal technology,
The device includes：
Acquisition module, the channel information for obtaining each path communicated with intended recipient end；
First determining module, for obtaining noise signal using time reversal technology according to the channel information in each path,
Noise signal is 0 in preset time point；
Signal averaging module obtains coded signal for noise signal to be superimposed in signal to be transmitted；
Sending module sends coded signal to intended recipient end.
The third aspect, an embodiment of the present invention provides a kind of computer equipment, which includes：
Processor, communication interface, memory and communication bus, wherein processor, communication interface, memory pass through bus
Complete mutual communication；Memory, for storing computer program；Processor, for executing the journey stored on memory
Sequence, the step of realizing the safety of physical layer communication means based on time reversal technology that above-mentioned first aspect provides.
Fourth aspect, an embodiment of the present invention provides a kind of computer readable storage medium, storage in the storage medium
Have a computer program, the computer program realize that above-mentioned first aspect provides when being executed by processor based on time reversal skill
The step of safety of physical layer communication means of art.
A kind of safety of physical layer communication means and device based on time reversal technology provided in an embodiment of the present invention, application
Signal sending end in communication system, by the channel information for obtaining each path communicated with intended recipient end；According to each road
The channel information of diameter obtains the noise signal for being 0 in preset time point using time reversal technology；The noise signal is superimposed
To in signal to be transmitted, coded signal is obtained；The coded signal is sent to intended recipient end.Coded signal is transmitted to from transmitting terminal
When intended recipient end, there are propagation delay times can just collect completely by the propagation delay time in preset time point target receiving terminal
Coded signal, propagation delay time corresponds to the channel information in each path communicated with intended recipient end.It is based on connecing with target as a result,
Noise signal is designed as believing with intended recipient end by the channel information in each path of receiving end communication using time reversal technology
Information corresponding preset time point in road is 0, so that intended recipient end when preset time point collects coded signal, is encrypted
Noise is 0 in signal；And the difference of the channel information due to illicit reception end and intended recipient end, no matter when acquire encryption letter
Number, noise signal in coded signal is not 0, therefore, illicit reception end can be interfered by noise signal and can not be from acquisition
Signal to be transmitted is identified in coded signal, to realize the secure communication under the shielding of time domain AN signals, avoids traditional AN
The risk that signal shielding technology is used to be ravesdropping when secure communication.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described.
Fig. 1 is the flow signal of the safety of physical layer communication means based on time reversal technology of one embodiment of the invention
Figure；
Fig. 2 is intended recipient in the safety of physical layer communication means based on time reversal technology of one embodiment of the invention
Coded signal transmits schematic diagram at end；
Fig. 3 is illicit reception in the safety of physical layer communication means based on time reversal technology of one embodiment of the invention
Coded signal transmits schematic diagram at end；
Fig. 4 is the flow signal of the safety of physical layer communication means based on time reversal technology of another embodiment of the present invention
Figure；
Fig. 5 is the structural representation of the safety of physical layer communication device based on time reversal technology of one embodiment of the invention
Figure；
Fig. 6 is the structural representation of the safety of physical layer communication device based on time reversal technology of another embodiment of the present invention
Figure；
Fig. 7 is the structural schematic diagram of the computer equipment of one embodiment of the invention.
Specific implementation mode
In order to make those skilled in the art more fully understand the technical solution in the present invention, implement below in conjunction with the present invention
Attached drawing in example, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
The every other embodiment that art personnel are obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It is situated between first below to the safety of physical layer communication means based on time reversal technology of one embodiment of the invention
It continues.
Safety of physical layer communication means provided in an embodiment of the present invention based on time reversal technology, can be applied to can
The computer equipment of signal of communication is sent, which includes desktop computer, portable computer, server etc., is not made herein
It limits, any computer equipment that the embodiment of the present invention may be implemented belongs to the protection domain of the embodiment of the present invention.
As shown in Figure 1, the flow of the safety of physical layer communication means based on time reversal technology of one embodiment of the invention,
Applied to the signal sending end in communication system, may include：
S101 obtains the channel information in each path communicated with intended recipient end.
The channel information in each path that signal sending end is communicated with intended recipient end may include the channel increasing in each path
Benefit, propagation delay time.Channel information is that each path is intrinsic, and different receiving terminals has different paths, therefore, different receiving terminals
The channel information in path is also different.
The method for obtaining channel information can be specifically signal sending end according to the pilot signal for measurement received
It determines, can also be that signal sending end is determined according to the historical communication information with intended recipient end.It is any to be used to obtain mesh
The method of the channel information in tag splice receiving end path is used equally for the present invention, the present embodiment not to be restricted this.
S102 obtains noise signal, noise signal is pre- according to the channel information in each path using time reversal technology
If time point is 0.
Noise signal is superimposed in signal to be transmitted, obtains coded signal by S103.
S104 sends coded signal to intended recipient end.
Time reversal technology is specially using preset time reversion preconditioned functions and convolution algorithm, in preset time point
The channel gain for assembling each path makes the signal energy to be transmitted that the coded signal of each path transmission includes reach peak value, to
Sampling can obtain complete coded signal at the time point.Therefore, when being communicated using time reversal technology, receiving terminal meeting
In the time point sampling that signal is all assembled, to collect whole signals.Wherein, preset time reversion preconditioned functions are bases
What the channel information in each path determined, it is specifically as follows the conjugate form of the time reversal of channel impulse response.
Correspondingly, using the channel information of time reversal technology and each path, noise signal is determined as assembling in signal
Preset time point be 0, this noise signal and Signal averaging to be transmitted are obtained into coded signal, intended recipient end can be made to adopt
In the coded signal collected, noise signal 0.
A kind of safety of physical layer communication means based on time reversal technology provided in an embodiment of the present invention is applied to communication
Signal sending end in system, by the channel information for obtaining each path communicated with intended recipient end；According to the letter in each path
Road information obtains the noise signal for being 0 in preset time point using time reversal technology；The noise signal is superimposed to be passed
In defeated signal, coded signal is obtained；The coded signal is sent to intended recipient end.Coded signal is transmitted to target from transmitting terminal and connects
When receiving end, there are propagation delay times, and by the propagation delay time, complete encryption can be just collected in preset time point target receiving terminal
Signal, propagation delay time correspond to the channel information in each path communicated with intended recipient end.It is based on as a result, logical with intended recipient end
The channel information in each path of letter, using time reversal technology, by noise signal be designed as with intended recipient end channel information
Corresponding preset time point is 0, so that intended recipient end is when preset time point collects coded signal, in coded signal
Noise is 0；And the difference of the channel information due to illicit reception end and intended recipient end, coded signal no matter when is acquired, is added
Noise signal in secret letter number is not 0, and therefore, illicit reception end can be interfered by noise signal and can not be believed from the encryption of acquisition
Signal to be transmitted is identified in number, to realize the secure communication under the shielding of time domain AN signals, traditional AN signals is avoided to cover
The risk that shield technology is used to be ravesdropping when secure communication.
Optionally, in the S101 of embodiment illustrated in fig. 1 of the present invention, the channel information in each path may include：Each path
Channel gain.
Correspondingly, the S102 of embodiment illustrated in fig. 1 of the present invention, can specifically include：
According to the channel gain in each path, formula is determined using Preset Transfer coefficient, the noise letter in each path is calculated
Number transmission coefficient, wherein Preset Transfer coefficient determines that formula is formula one：
In formula one, L is the quantity in the path communicated with intended recipient end, and i is the number in path, hiFor the letter of path i
Road gain, niFor the noise signal transmission coefficient of path i.
When default initial noisc signal is discrete signal, according to noise signal transmission coefficient, the channel gain in each path
Noise signal is calculated using the first default noise signal calculation formula with default initial noisc signal, wherein first is pre-
If noise signal calculation formula is formula two：
A '={ h [k] * n [- k] } A,
In formula two, h [k] is channel gain hiSet, n [- k] be noise signal transmission coefficient niInverted order set, A
For default initial noisc signal, A ' is noise signal.
Alternatively, when default initial noisc signal is continuous signal, according to noise signal transmission coefficient, the channel in each path
Noise signal is calculated using the second default noise signal calculation formula in gain and default initial noisc signal, wherein the
Two default noise signal calculation formula are formula three：
In formula three, h (t) is channel gain hiSet, n (- t) be noise signal transmission coefficient niInverted order set.
In order to achieve the purpose that in preset time spot noise signal be 0, noise signal transmission coefficient is determined as meeting public
Formula one, that is, it is h to pass through L channel gainiTransmission after, when signal is assembled be 0.This is met into making an uproar for formula one
Transmission coefficient of the acoustical signal transmission coefficient as default initial noisc signal A, so that it may to obtain the noise when signal is assembled for 0
Signal A '.
The S103 of embodiment illustrated in fig. 1 of the present invention, can specifically include：
When original transmission signal is discrete signal, based on original transmission signal, preset time reversion preconditioned functions and
The channel gain in each path presets signal calculation formula to be transmitted using first, signal to be transmitted is calculated, wherein first
It presets signal to be transmitted and is calculated as formula four：
S '={ h [k] * h*[- k] } S,
In formula four, h*[- k] is that preset time inverts preconditioned functions, and S is original transmission signal, and S' is letter to be transmitted
Number.
Alternatively, when original transmission signal is continuous signal, based on original transmission signal, preset time reversion pretreatment letter
The channel gain of number and each path presets signal calculation formula to be transmitted using second, signal to be transmitted is calculated, wherein
Second presets signal calculation formula to be transmitted as formula five：
In formula five, h*(- t) is that preset time inverts preconditioned functions.
By carrying out time reversal pretreatment to original transmission signal, so that signal to be transmitted passes through each path transmission,
Preset time point is assembled.Certainly, in addition to time reversal pre-process other than, those skilled in the art can also according to common knowledge,
Wireless transmission pretreatment is carried out to original transmission signal, so that signal to be transmitted can be efficiently transmitted over a channel.
Using preset signals Superposition Formula, superimposed noise signal and signal to be transmitted obtain coded signal, wherein default
Signal averaging formula is formula six：S'+A'.
Such as：The path communicated with intended recipient end has 3, with this 3 path l0、l1And l2Corresponding propagation delay time
Respectively 0, τ1And τ2, corresponding path gain is respectively h0、h1And h2.If one embodiment of the invention is based on time reversal
In the safety of physical layer communication means of technology, coded signal transmits schematic diagram at intended recipient end, shown in Fig. 2：Coded signal S'+
When A' is transmitted to intended recipient end from transmitting terminal, in channel gain 3 paths different with propagation delay time, in coded signal
There are different decaying for signal to be transmitted.And in fig. 2 at 0 corresponding preset time point, the channel gain in each path is assembled,
The channel gain exactly assembled strengthens signal to be transmitted with preset time reversion preconditioned functions, and signal energy to be transmitted is made to reach
Peak value is arrived, to obtain complete signal to be transmitted:
Or
Correspondingly, in fig. 2 at 0 corresponding preset time point, intended recipient end can collect complete encryption letter
Number：S'+A'=(| h0|2+|h1|2+|h2|2)S+(h0n0+h1n1+h2n2)A.Simultaneously as in coded signal noise signal biography
Defeated coefficient meets formula one：Preset Transfer coefficient determines formula:
Therefore, in fig. 2 at 0 corresponding preset time point, in coded signal, noise signal：
A'=∑s { h [k] * n [- k] } A=(h0n0+h1n1+h2n2) A=0, or
To make in the collected coded signal in intended recipient end containing only available for transmission signal：
S'+A'=S'+0=(| h0|2+|h1|2+|h2|2)S。
For illicit reception end, also by taking 3 paths as an example.With this 3 path le0、le1And le2Corresponding propagation delay time
Respectively 0e、τe1And τe2, corresponding channel gain is respectively he0、he1And he2.If one embodiment of the invention is based on the time
In the safety of physical layer communication means of inversion technique, coded signal transmits schematic diagram at illicit reception end, shown in Fig. 3：To transmission
End transmission coded signal S'+A' eavesdropped by illicit reception end, the channel gain at illicit reception end it is different with propagation delay time 3
In a path, there are different decaying for the signal to be transmitted in coded signal.And in figure 3, even 0eCorresponding time point
Place, due to preset time reversion preconditioned functions h*[- k] and h*(- t) is the path l according to intended recipient end0、l1And l2Point
Not corresponding channel gain h0、h1And h2Determining, therefore, for channel gain he0、he1And he2Not with intended recipient end
Same illicit reception end, can not pass through the channel gain in each path and preset time inverts preconditioned functions and reinforces letter to be transmitted
Number, the signal to be transmitted that the coded signal eavesdropped includes also just is still decaying, and the energy of signal to be transmitted is also with regard to nothing
Method reaches peak value, can only obtainAnd it is unable to get complete to be passed
Defeated signal (| h0 2+|h1|2+|h2|2)S.Meanwhile in figure 30eAt corresponding time point, due to noise signal in coded signal
The formula one that transmission coefficient is met：Preset Transfer coefficient determines formulaIt is also to increase with the channel at intended recipient end
Beneficial hiIt is corresponding, therefore, noise signal (h in the coded signal S'+A' that illicit reception end interceptse0n0+he1n1+he2n2)A
It is not 0.To not only make signal energy to be transmitted in the collected coded signal in illicit reception end be unable to reach peak value, Er Qiehui
It is interfered by noise signal, more None- identified goes out signal to be transmitted.And except 0eWhen other other than corresponding time point
Between at point, limited by noise signal, propagation delay time and time reversal technology, coded signal is also decaying and there are noise jammings
's.As it can be seen that point, illicit reception end can not all be identified to be transmitted by noise jamming from coded signal at any time
Signal.Also, it is further, though illicit reception end simulates the routing information at intended recipient end, but since noise signal is 0
Preset time point only have signal sending end and intended recipient end is known, and illegal receiving terminal can not determine that noise signal is 0
Preset time point is also difficult to acquire coded signal in the preset time point that noise signal is 0, and illicit reception end still can be by
Noise signal is interfered.To realize the secure communication under the shielding of time domain AN signals, traditional AN signals shielding technology is avoided to use
The risk being ravesdropping when secure communication.
As shown in figure 4, the stream of the safety of physical layer communication means based on time reversal technology of another embodiment of the present invention
Journey may include：
S401 obtains the channel information in each path communicated with intended recipient end.
S401 is the step identical as the S101 in embodiment illustrated in fig. 1, and details are not described herein, implements as shown in Figure 1 in detail
The description of example.
S402 determines formula according to multiple default first signal-to-noise ratio at intended recipient end and default safe rate, utilizes
Optimal resolving Algorithm is preset, the first preset quantity targeted security rate is calculated.
Safe rate is used to evaluate the communication security performance of communication system, by the signal-to-noise ratio at intended recipient end and and illegal
Signal-to-noise ratio at receiving terminal codetermines, and signal-to-noise ratio and each channel build-in attribute (such as：The channel white Gaussian noise in path)
It is related.Correspondingly, multiple paths can correspond to multiple signal-to-noise ratio respectively, multiple signal-to-noise ratio also allow for the safety speed of communication system
Rate is various.
It, can be according to multiple default the of intended recipient end in order to optimize the communication security performance of communication system based on this
One signal-to-noise ratio and default safe rate determine formula, and using default optimal resolving Algorithm, the first preset quantity mesh is calculated
Safe rate is marked, that is, from multiple safe rates, in contrast communication security performance more preferably target peace can be made by determining
Full rate.Wherein, it can be determined according to the historical information communicated with intended recipient end to preset the first signal-to-noise ratio, can also be
It is determined according to the ratio of signal power to be transmitted and noise power.Optimal resolving Algorithm is preset to be used for from multiple safe rates
Middle determining targeted security rate, is specifically as follows the method for exhaustion, hill-climbing algorithm or particle cluster algorithm etc..It is any can be from multiple peaces
Determine that the optimal resolving Algorithm of targeted security rate is used equally for the present invention, the present embodiment not to be restricted this in full rate.
S403 is determined and is preset with each from each path according to corresponding each default first signal-to-noise ratio of each targeted security rate
The corresponding each destination path of first signal-to-noise ratio.
Since safe rate is corresponding with the signal-to-noise ratio at intended recipient end, and signal-to-noise ratio is related to channel build-in attribute,
Accordingly, it is determined that targeted security rate, can also determine and each default first from each channel communicated with intended recipient end
The corresponding each destination path of signal-to-noise ratio.
S404 determines formula using goal-selling transmission coefficient, mesh is calculated according to the channel gain of each destination path
Mark noise signal transmission coefficient, wherein the goal-selling transmission coefficient determines that formula is formula seven：
In formula seven, njFor target noise signal transmission coefficient, M is the first preset quantity, and j is the number of destination path, hj
For the destination channel gain of destination path j.
S405, when default initial noisc signal is discrete signal, according to the target noise signal transmission of each destination path
Coefficient, destination channel gain and default initial noisc signal are calculated using the first goal-selling noise signal calculation formula
Target noise signal, wherein the first goal-selling noise signal calculation formula is formula eight：
A "={ ha[k]*na[- k] } A,
In formula eight, ha[k] is destination channel gain hjSet, na[- k] is target noise signal transmission coefficient nj's
Inverted order set, A " are target noise signal.
Alternatively, when default initial noisc signal is continuous signal, according to the target noise signal of each destination path
Transmission coefficient, destination channel gain and default initial noisc signal are calculated using the second goal-selling noise signal calculation formula
Obtain target noise signal, wherein the second goal-selling noise signal calculation formula is formula nine：
In formula nine, ha(t) it is destination channel gain hjSet, na(- t) is the target noise signal transmission coefficient
njInverted order set.
S406 is located when original transmission signal is discrete signal based on original transmission signal, goal-selling time reversal in advance
The destination channel gain for managing function and each destination path is preset echo signal calculation formula to be transmitted using first, is calculated
Echo signal to be transmitted, wherein first presets echo signal calculation formula to be transmitted as formula ten：
In formula ten,Preset time inverts preconditioned functions, and S " is echo signal to be transmitted.
Alternatively, when original transmission signal is continuous signal, located in advance based on original transmission signal, goal-selling time reversal
The destination channel gain for managing function and each destination path is preset echo signal calculation formula to be transmitted using second, is calculated
Echo signal to be transmitted, wherein second presets echo signal calculation formula to be transmitted as formula 11：
In formula 11,For the goal-selling time reversal preconditioned functions.
S407 is superimposed target noise signal and echo signal to be transmitted, obtains mesh using goal-selling Signal averaging formula
Mark coded signal, wherein goal-selling Signal averaging formula is formula 12：S”+A”.
S408 sends target coded signal to intended recipient end.
Compared with the mode for sending coded signal, in embodiment illustrated in fig. 4, using targeted security rate as foundation, it will encrypt
Signal to be transmitted and noise signal in signal are determined as being 0 in the transmission of each destination channel, in non-targeted channel, that is, send out
Target coded signal is sent, to which the path for making to transmit coded signal in communication system is target corresponding with targeted security rate road
Diameter further promotes the communication security performance of communication system.
Such as：The 3 path l communicated with intended recipient end0、l1And l2Corresponding default first signal-to-noise ratio is respectively
SNRd0、SNRd1And SNRd2, according to these three signal-to-noise ratio and default safe rate calculation formula, using default optimal resolving Algorithm,
It is R that targeted security rate, which is calculated,s0、Rs1.So according to targeted security rate Rs0、Rs1Corresponding default first noise
Compare SNRd0、SNRd1, determine that destination path is l0、l1.According to destination path l0、l1Corresponding destination channel gain h0、h1,
Formula is determined using goal-selling transmission coefficientTarget noise signal transmission coefficient n is calculated0、n1.Root
According to the target noise signal transmission coefficient n of each destination path0、n1, destination channel gain h0、h1With default initial noisc signal A,
Using the first goal-selling noise signal calculation formula formula eight or the first goal-selling noise signal calculation formula formula nine,
Target noise signal A " is calculated.Preconditioned functions are inverted based on original transmission signal S, preset timeWith each mesh
Mark the destination channel gain h in path0、h1, it is default to preset echo signal calculation formula formula ten or second to be transmitted using first
Echo signal calculation formula formula 11 to be transmitted, is calculated echo signal S " to be transmitted.Utilize goal-selling Signal averaging
12 S of formula formula "+A " is superimposed target noise signal and echo signal to be transmitted, obtains target coded signal.
Optionally, the S402 in embodiment illustrated in fig. 4 of the present invention may include：
According to the total transmission power of itself, using predetermined power allocation algorithm, multiple signal powers to be transmitted and more are determined
A noise power.
For each signal power to be transmitted and each noise power, by the signal power to be transmitted and corresponding noise
The ratio of signal power is determined as default first signal-to-noise ratio.
Due to presetting the ratio that the first signal-to-noise ratio is signal power to be transmitted and corresponding noise power, it can
Before determining multiple default first signal-to-noise ratio, to determine multiple signal powers to be transmitted and multiple noise powers.Wherein,
Signal power to be transmitted and noise power can be allocated determination by the total transmission power to signal sending end.Believing
One timing of total transmission power of number transmitting terminal itself, predetermined power allocation algorithm can be to be divided according to predetermined power distribution ratio
Match, can also be and the specific requirements of noise power and signal power to be transmitted are allocated according to user.Certainly, consider
To the influence of the build-in attribute (such as the channel white Gaussian noise in path) to signal-to-noise ratio in each path, in practical application, noise letter
Number power can be the power for the overall noise that channel white Gaussian noise is added after noise signal.
According to each default first signal-to-noise ratio and multiple default second signal-to-noise ratio at illicit reception end, default safety speed is utilized
Rate determines formula, and multiple safe rates are calculated.
Due to the difference of illicit reception end corresponding path build-in attribute and intended recipient end, for illicit reception end
Default second signal-to-noise ratio at place, can be preset as different from default first signal-to-noise ratio.
The size for comparing each safe rate determines that the first preset quantity is pacified according to the sequence of safe rate from big to small
Full rate, as targeted security rate.
Wherein, default safe rate determines that formula is formula 13：
Rs=[log2(1+SNRd)-log2(1+SNRe)]+,
In formula 13, SNRdTo preset the first signal-to-noise ratio, SNReIt makes an uproar ratio for default second.
Such as：According to the total transmission power of itself 3 signal powers to be transmitted are determined using predetermined power allocation algorithm
Ps1、Ps2And Ps3And 3 noise power Pn1、Pn2And Pn3.By signal power P to be transmitteds1With noise power
Pn1Ratio be determined as default first Signal to Noise Ratio (SNR)d0, by signal power P to be transmitteds2With noise power Pn2Ratio it is true
It is set to default first Signal to Noise Ratio (SNR)d1, by signal power P to be transmitteds3With noise power Pn3Ratio be determined as default the
One Signal to Noise Ratio (SNR)d2.According to default first Signal to Noise Ratio (SNR)d0、SNRd1And SNRd2, and it is equal with this 3 default first signal-to-noise ratio
Default second Signal to Noise Ratio (SNR) of 3 of different illicit reception ende0、SNRe1And SNRe2, determined using default safe rate
Formula Rs=[log2(1+SNRd)-log2(1+SNRe)]+, 3 safe rate R are calculateds0、Rs1And Rs2.Compare to obtain each
The size of safe rate is Rs0＞ Rs1＞ Rs2, according to the sequence of safe rate from big to small, determine 2 safe rate Rs0、Rs1
As targeted security rate.
Optionally, the above-mentioned total transmission power according to itself determines multiple letters to be transmitted using predetermined power allocation algorithm
It the step of number power and multiple noise powers, can specifically include：
When judging that the total transmission power of itself is less than or equal to default total power threshold, based on the total transmitting work(of itself
Rate and multiple preset signals power-division ratios, using predetermined power distribute formula, be calculated multiple signal powers to be transmitted and
Multiple noise powers, wherein it is formula 14 that predetermined power, which distributes formula,：
In formula 14,For preset signals signal power distribution ratio, P is the total transmission power of itself, PsIt is to be transmitted
Signal power, PnFor noise power.
In practical applications, the total emission power of unlike signal transmitting terminal is of different sizes, total emission power is less than or
Person is equal to the signal sending end of default total power threshold, and distributable total emission power is limited, therefore, can be according to default work(
Rate distribution ratio determines signal power to be transmitted and noise power.Wherein, multiple predetermined power distribution ratios can be basis
Historical experience setting, default total power threshold can be arranged according to practical application scene, such as can be by given size base
The total emission power stood is as default total power threshold.
Such as：Using the total emission power 40W of common scale base as default total power threshold, the total transmitting of itself is judged
Power PsIt is less than default total power threshold 40W for 20W.Therefore, based on the total transmission power 20W of itself and 3 preset signals work(
Rate distribution ratioAndFormula is distributed using predetermined powerIt is calculated 3
A signal power P to be transmitteds1=10W, Ps2=12W and Ps3=14W and 3 noise power Pn1=10W, Pn2=8W
And Pn3=6W.
Corresponding to above method embodiment, one embodiment of the invention additionally provides the physical layer based on time reversal technology
Secure communication device.
As shown in figure 5, the structure of the safety of physical layer communication device based on time reversal technology of one embodiment of the invention,
May include：
Acquisition module 501, the channel information for obtaining each path communicated with intended recipient end.
First determining module 502 obtains noise letter for the channel information according to each path using time reversal technology
Number, noise signal is 0 in preset time point.
Signal averaging module 503 obtains coded signal for noise signal to be superimposed in signal to be transmitted.
Sending module 504 sends coded signal to intended recipient end.
Optionally, the channel information in each path may include：The channel gain in each path.
First determining module 502, is specifically used for：
According to the channel gain in each path, formula is determined using Preset Transfer coefficient, the noise letter in each path is calculated
Number transmission coefficient, wherein Preset Transfer coefficient determines that formula is formula one：
In formula one, L is the quantity in the path communicated with the intended recipient end, and i is the number in path, the hiFor road
The channel gain of diameter i, niFor the noise signal transmission coefficient of path i.
When default initial noisc signal is discrete signal, according to noise signal transmission coefficient, the channel gain in each path
Noise signal is calculated using the first default noise signal calculation formula with default initial noisc signal, wherein first is pre-
If noise signal calculation formula is formula two：
A '={ h [k] * n [- k] } A,
In formula two, h [k] is channel gain hiSet, n [- k] be noise signal transmission coefficient niInverted order set, A
For default initial noisc signal, A ' is noise signal.
Alternatively, when default initial noisc signal is continuous signal, according to noise signal transmission coefficient, the channel in each path
Noise signal is calculated using the second default noise signal calculation formula in gain and default initial noisc signal, wherein the
Two default noise signal calculation formula are formula three：
In formula three, h (t) is channel gain hiSet, n (- t) be noise signal transmission coefficient niInverted order set.
Signal averaging module 503, is specifically used for：
When original transmission signal is discrete signal, based on original transmission signal, preset time reversion preconditioned functions and
The channel gain in each path presets signal calculation formula to be transmitted using first, signal to be transmitted is calculated, wherein first
Preset time reversion pretreatment formula is formula four：
S '={ h [k] * h*[- k] } S,
In formula four, h*[- k] is that preset time inverts preconditioned functions, and S is original transmission signal, and S' is letter to be transmitted
Number.
Alternatively, when original transmission signal is continuous signal, based on original transmission signal, preset time reversion pretreatment letter
The channel gain of number and each path presets signal calculation formula to be transmitted using second, signal to be transmitted is calculated, wherein
Second presets signal calculation formula to be transmitted as formula five：
In formula five, h*(- t) is that preset time inverts preconditioned functions.
Using preset signals Superposition Formula, superimposed noise signal and signal to be transmitted obtain coded signal, wherein default
Signal averaging formula is formula six：S'+A'.
As shown in fig. 6, the knot of the safety of physical layer communication device based on time reversal technology of another embodiment of the present invention
Structure may include：
Acquisition module 601, the channel information for obtaining each path communicated with intended recipient end.
601 with the 501 of embodiment illustrated in fig. 5 of the present invention be identical module.
Second determining module 602, for according to multiple default first signal-to-noise ratio at the intended recipient end and default peace
Full rate determines formula, and using default optimal resolving Algorithm, the first preset quantity targeted security rate is calculated；According to each mesh
Corresponding each default first signal-to-noise ratio of safe rate is marked, from each path, determines and presets the corresponding each mesh of the first signal-to-noise ratio with each
Mark path；
First determining module 603, is specifically used for：
According to the channel gain of each destination path, determines formula using goal-selling transmission coefficient, target is calculated and makes an uproar
Acoustical signal transmission coefficient, wherein goal-selling transmission coefficient determines that formula is formula seven：
In formula seven, njFor target noise signal transmission coefficient, M is the first preset quantity, and j is the number of destination path, hj
For the destination channel gain of destination path j.
First determining module 603, is additionally operable to：
When default initial noisc signal is discrete signal, according to the target noise signal transmission coefficient of each destination path,
Target is calculated using the first goal-selling noise signal calculation formula in destination channel gain and default initial noisc signal
Noise signal, wherein the first goal-selling noise signal calculation formula is formula eight：
A "={ ha[k]*na[- k] } A,
In formula eight, ha[k] is destination channel gain hjSet, na[- k] is target noise signal transmission coefficient nj's
Inverted order set, A " are target noise signal.
Alternatively, when default initial noisc signal is continuous signal, according to the target noise signal of each destination path
Transmission coefficient, destination channel gain and default initial noisc signal are calculated using the second goal-selling noise signal calculation formula
Obtain target noise signal, wherein the second goal-selling noise signal calculation formula is formula nine：
In formula nine, ha(t) it is destination channel gain hjSet, na(- t) is the target noise signal transmission coefficient
njInverted order set.
Signal averaging module 604, is specifically used for：
When original transmission signal is discrete signal, based on original transmission signal, preset time reversion preconditioned functions and
The destination channel gain of each destination path presets echo signal calculation formula to be transmitted using first, mesh to be transmitted is calculated
Mark signal, wherein first presets echo signal calculation formula to be transmitted as formula ten：
In formula ten,Preset time inverts preconditioned functions, and S " is echo signal to be transmitted.
Alternatively, when original transmission signal is continuous signal, based on original transmission signal, preset time reversion pretreatment letter
The destination channel gain of number and each destination path is preset echo signal calculation formula to be transmitted using second, is calculated to be passed
Defeated echo signal, wherein second presets echo signal calculation formula to be transmitted as formula 11：
In formula 11,Preconditioned functions are inverted for the preset time.
Signal averaging module 604, is additionally operable to：
Using goal-selling Signal averaging formula, it is superimposed the target noise signal and the echo signal to be transmitted, is obtained
To target coded signal, wherein goal-selling Signal averaging formula is formula 12：S”+A”.
Sending module 605, is specifically used for：
Target coded signal is sent to intended recipient end.
Optionally, the second determining module 602, is specifically used for：
According to the total transmission power of itself, using predetermined power allocation algorithm, multiple signal powers to be transmitted and more are determined
A noise power.
For each signal power to be transmitted and each noise power, by the signal power to be transmitted and corresponding noise
The ratio of signal power is determined as default first signal-to-noise ratio.
According to each default first signal-to-noise ratio and multiple default second signal-to-noise ratio at illicit reception end, default safety speed is utilized
Rate determines formula, and multiple safe rates are calculated.
The size for comparing each safe rate determines that the first preset quantity is pacified according to the sequence of safe rate from big to small
Full rate, as targeted security rate.
Wherein, default safe rate determines that formula is formula 13：
Rs=[log2(1+SNRd)-log2(1+SNRe)]+,
In formula 13, SNRdFor default first signal-to-noise ratio, SNReIt makes an uproar ratio for described default second.
Optionally, the second determining module 602, is additionally operable to：
When judging that the total transmission power of itself is less than or equal to default total power threshold, based on the total transmitting work(of itself
Rate and multiple preset signals power-division ratios, using predetermined power distribute formula, be calculated multiple signal powers to be transmitted and
Multiple noise powers, wherein it is formula 14 that predetermined power, which distributes formula,：
In formula 14,For preset signals signal power distribution ratio, P is the total transmission power of itself, PsIt is to be transmitted
Signal power, PnFor noise power.
A kind of safety of physical layer communication device based on time reversal technology provided in an embodiment of the present invention is applied to communication
Signal sending end in system, by the channel information for obtaining each path communicated with intended recipient end；According to the letter in each path
Road information obtains the noise signal for being 0 in preset time point using time reversal technology；The noise signal is superimposed to be passed
In defeated signal, coded signal is obtained；The coded signal is sent to intended recipient end.Coded signal is transmitted to target from transmitting terminal and connects
When receiving end, there are propagation delay times, and by the propagation delay time, complete encryption can be just collected in preset time point target receiving terminal
Signal, propagation delay time correspond to the channel information in each path communicated with intended recipient end.It is based on as a result, logical with intended recipient end
The channel information in each path of letter, using time reversal technology, by noise signal be designed as with intended recipient end channel information
Corresponding preset time point is 0, so that intended recipient end is when preset time point collects coded signal, in coded signal
Noise is 0；And the difference of the channel information due to illicit reception end and intended recipient end, coded signal no matter when is acquired, is added
Noise signal in secret letter number is not 0, and therefore, illicit reception end can be interfered by noise signal and can not be believed from the encryption of acquisition
Signal to be transmitted is identified in number, to realize the secure communication under the shielding of time domain AN signals, traditional AN signals is avoided to cover
The risk that shield technology is used to be ravesdropping when secure communication.
One embodiment of the invention additionally provides a kind of computer equipment, as shown in fig. 7, comprises processor 701, communication interface
702, memory 703 and communication bus 704, wherein processor 701, communication interface 702, memory logical 703 cross communication bus
704 complete mutual communication；
The memory 703, for storing computer program；
The processor 701 when for executing the computer program stored on the memory 703, realizes above-mentioned base
In all steps of the safety of physical layer communication means of time reversal technology.
A kind of computer equipment provided in an embodiment of the present invention passes through acquisition as the signal sending end in communication system
The channel information in each path communicated with intended recipient end；It is obtained using time reversal technology according to the channel information in each path
The noise signal for being 0 in preset time point；The noise signal is superimposed in signal to be transmitted, coded signal is obtained；To target
Receiving terminal sends the coded signal.When coded signal is transmitted to intended recipient end from transmitting terminal, there are propagation delay times, by the biography
Defeated time delay can just collect complete coded signal in preset time point target receiving terminal, and propagation delay time corresponds to be connect with target
The channel information in each path of receiving end communication.Channel information as a result, based on each path communicated with intended recipient end, when utilization
Between inversion technique, by noise signal be designed as preset time point be 0 so that intended recipient end with intended recipient end believe
When information corresponding preset time point in road collects coded signal, noise is 0 in coded signal；And due to the letter at illicit reception end
No matter when the difference of road information and intended recipient end acquires coded signal, and the noise signal in coded signal is not 0, because
This, illicit reception end can be interfered by noise signal and can not identify signal to be transmitted from the coded signal of acquisition, to real
The secure communication under the shielding of time domain AN signals is showed, has been ravesdropping when traditional AN signals shielding technology being avoided to be used for secure communication
Risk.
The communication bus that above computer equipment is mentioned can be Peripheral Component Interconnect standard (Peripheral
Component Interconnect, abbreviation PCI) bus or expanding the industrial standard structure (Extended Industry
Standard Architecture, abbreviation EISA) bus etc..The communication bus can be divided into address bus, data/address bus, control
Bus processed etc..It for ease of indicating, is only indicated with a thick line in figure, it is not intended that an only bus or a type of total
Line.
Communication interface is for the communication between above computer equipment and other equipment.
Memory may include random access memory (Random Access Memory, abbreviation RAM), can also include
Nonvolatile memory (Non-Volatile Memory, abbreviation NVM), for example, at least a magnetic disk storage.Optionally, it deposits
Reservoir can also be at least one storage device for being located remotely from aforementioned processor.
Above-mentioned processor can be general processor, including central processing unit (Central Processing Unit,
Abbreviation CPU), network processing unit (Network Processor, abbreviation NP) etc.；It can also be digital signal processor
(Digital Signal Processor, abbreviation DSP), application-specific integrated circuit (Application Specific
Integrated Circuit, abbreviation ASIC), field programmable gate array (Field-Programmable Gate Array,
Abbreviation FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware components.
One embodiment of the invention additionally provides a kind of computer readable storage medium, the computer readable storage medium memory
Computer program is contained, when which is executed by processor, realizes the above-mentioned physical layer peace based on time reversal technology
All steps of full communication method.
Computer readable storage medium provided in an embodiment of the present invention, including signal sending end in a communications system, is deposited
When the computer program of storage is executed by processor, the channel information for obtaining each path communicated with intended recipient end may be implemented；
According to the channel information in each path, using time reversal technology, the noise signal for being 0 in preset time point is obtained；By the noise
In Signal averaging to signal to be transmitted, coded signal is obtained；The coded signal is sent to intended recipient end.Coded signal is from transmission
When end is transmitted to intended recipient end, there are propagation delay times can just adopt by the propagation delay time in preset time point target receiving terminal
Collect complete coded signal, propagation delay time corresponds to the channel information of each channel communicated with intended recipient end.It is based on as a result,
The channel information in each path communicated with intended recipient end, using time reversal technology, by noise signal be designed as with mesh
The corresponding preset time point of tag splice receiving end channel information is 0, so that intended recipient end collects encryption in preset time point
When signal, noise is 0 in coded signal；And the difference of the channel information due to illicit reception end and intended recipient end, no matter what
When acquire coded signal, the noise signal in coded signal be 0, therefore, illicit reception end can by noise signal interfere and
Signal to be transmitted can not be identified from the coded signal of acquisition, it is logical to realize the safety under the shielding of time domain AN signals
Letter avoids risk of traditional AN signals shielding technology for being ravesdropping when secure communication.
Each embodiment in this specification is all made of relevant mode and describes, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments.Especially for device and
For computer equipment embodiment, since it is substantially similar to the method embodiment, so description is fairly simple, related place ginseng
See the part explanation of embodiment of the method.
Herein, relational terms such as first and second and the like be used merely to by an entity or operation with it is another
One entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this reality
Relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of safety of physical layer communication means based on time reversal technology, which is characterized in that be applied in communication system
Signal sending end, the method includes：
Obtain the channel information in each path communicated with intended recipient end；
Noise signal is obtained, the noise signal is in preset time using time reversal technology according to the channel information in each path
Point is 0；
The noise signal is superimposed in signal to be transmitted, coded signal is obtained；
The coded signal is sent to the intended recipient end.
2. according to the method described in claim 1, it is characterized in that, the channel information in each path includes：The letter in each path
Road gain；
The channel information according to each path obtains noise signal using time reversal technology, including：
According to the channel gain in each path, formula is determined using Preset Transfer coefficient, the noise signal that each path is calculated passes
Defeated coefficient, wherein the Preset Transfer coefficient determines that formula is：
The L is the quantity in the path communicated with the intended recipient end, and the i is the number in path, the hiFor path i's
Channel gain, the niFor the noise signal transmission coefficient of path i；
When default initial noisc signal is discrete signal, according to the noise signal transmission coefficient in each path, channel gain and pre-
If initial noisc signal, using the first default noise signal calculation formula, noise signal is calculated, wherein described first is pre-
If noise signal calculation formula is：
A '={ h [k] * n [- k] } A,
The h [k] is the channel gain hiSet, the n [- k] be the noise signal transmission coefficient niInverted order collection
It closes, the A is the default initial noisc signal, and the A ' is the noise signal；
Alternatively, when default initial noisc signal is continuous signal, according to noise signal transmission coefficient, the channel gain in each path
Noise signal is calculated using the second default noise signal calculation formula with default initial noisc signal, wherein described
Two default noise signal calculation formula are：
The h (t) is the channel gain hiSet, the n (- t) be the noise signal transmission coefficient niInverted order collection
It closes；
It is described that the noise signal is superimposed in signal to be transmitted, coded signal is obtained, including：
When original transmission signal is discrete signal, based on original transmission signal, preset time reversion preconditioned functions and Ge Lu
Signal to be transmitted is calculated using the first signal calculation formula to be transmitted in the channel gain of diameter, wherein described first is to be passed
Defeated signal calculation formula is：
S '={ h [k] * h*[- k] } S,
The h*[- k] is that the preset time inverts preconditioned functions, and the S is the original transmission signal, and the S' is institute
State signal to be transmitted；
Alternatively, when original transmission signal is continuous signal, based on original transmission signal, preset time reversion preconditioned functions and
The channel gain in each path presets signal calculation formula to be transmitted using second, signal to be transmitted is calculated, wherein described
Second, which presets signal calculation formula to be transmitted, is：
The h*(- t) is that the preset time inverts preconditioned functions；
Using preset signals Superposition Formula, it is superimposed the noise signal and the signal to be transmitted, obtains coded signal, wherein
The preset signals Superposition Formula is：
S'+A'。
3. according to the method described in claim 2, it is characterized in that, in each path for obtaining and being communicated with intended recipient end
After channel information, the method further includes：
Determine formula according to multiple default first signal-to-noise ratio at the intended recipient end and default safe rate, using it is default most
The first preset quantity targeted security rate is calculated in excellent resolving Algorithm；
According to corresponding each default first signal-to-noise ratio of each targeted security rate, from each path, determine and each default first noise
Than corresponding each destination path；
The channel gain according to each path determines formula using Preset Transfer coefficient, and the noise letter in each path is calculated
Number transmission coefficient, including：
According to the channel gain of each destination path, determines formula using goal-selling transmission coefficient, target is calculated and makes an uproar
Acoustical signal transmission coefficient, wherein the goal-selling transmission coefficient determines that formula is：
The njFor the target noise signal transmission coefficient, the M is first preset quantity, and the j is the target road
The number of diameter, the hjFor the destination channel gain of destination path j；
It is described according to the noise signal transmission coefficient in each path, channel gain and default initial noisc signal, utilize default noise
Noise signal is calculated in signal calculation formula, including：
When default initial noisc signal is discrete signal, according to the target noise signal transmission coefficient of each destination path,
Target is calculated using the first goal-selling noise signal calculation formula in destination channel gain and default initial noisc signal
Noise signal, wherein the first goal-selling noise signal calculation formula is：
A "={ ha[k]*na[- k] } A,
The ha[k] is the destination channel gain hjSet, the na[- k] is the target noise signal transmission coefficient nj
Inverted order set, the A " be target noise signal；
Alternatively, when default initial noisc signal is continuous signal, according to the target noise signal transmission of each destination path
Coefficient, destination channel gain and default initial noisc signal are calculated using the second goal-selling noise signal calculation formula
Target noise signal, wherein the second goal-selling noise signal calculation formula is：
The ha(t) it is the destination channel gain hjSet, the na(- t) is the target noise signal transmission coefficient nj
Inverted order set；
The channel gain that preconditioned functions and each path are inverted based on original transmission signal, preset time, utilization are to be transmitted
Signal to be transmitted is calculated in signal calculation formula, including：
When original transmission signal is discrete signal, based on original transmission signal, goal-selling time reversal preconditioned functions and
The destination channel gain of each destination path presets echo signal calculation formula to be transmitted using first, mesh to be transmitted is calculated
Mark signal, wherein described first, which presets echo signal calculation formula to be transmitted, is：
It is describedFor the goal-selling time reversal preconditioned functions, the S " is echo signal to be transmitted；
Alternatively, when original transmission signal is continuous signal, letter is pre-processed based on original transmission signal, goal-selling time reversal
The destination channel gain of number and each destination path is preset echo signal calculation formula to be transmitted using second, is calculated to be passed
Defeated echo signal, wherein described second, which presets echo signal calculation formula to be transmitted, is：
It is describedFor the goal-selling time reversal preconditioned functions；
It is described to utilize preset signals Superposition Formula, it is superimposed the noise signal and the signal to be transmitted, obtains coded signal, is wrapped
It includes：
Using goal-selling Signal averaging formula, it is superimposed the target noise signal and the echo signal to be transmitted, obtains mesh
Mark coded signal, wherein the goal-selling Signal averaging formula is：
S”+A”；
It is described to send the coded signal to the intended recipient end, including：
The target coded signal is sent to the intended recipient end.
4. according to the method described in claim 3, it is characterized in that, described default according to multiple the first of the intended recipient end
Signal-to-noise ratio and default safe rate determine formula, and using default optimal resolving Algorithm, the first preset quantity target is calculated
Safe rate, including：
According to the total transmission power of itself, using predetermined power allocation algorithm, determines multiple signal powers to be transmitted and multiple make an uproar
Acoustical signal power；
For each signal power to be transmitted and each noise power, by the signal power to be transmitted and corresponding noise signal
The ratio of power is determined as default first signal-to-noise ratio；
It is true using default safe rate according to each default first signal-to-noise ratio and multiple default second signal-to-noise ratio at illicit reception end
Determine formula, multiple safe rates are calculated；
The size for comparing each safe rate determines the first preset quantity safety speed according to the sequence of safe rate from big to small
Rate, as targeted security rate；
Wherein, default safe rate determines that formula is：
Rs=[log2(1+SNRd)-log2(1+SNRe)]+,
The SNRdFor default first signal-to-noise ratio, the SNReIt makes an uproar ratio for described default second.
5. according to the method described in claim 4, it is characterized in that, the total transmission power according to itself, utilizes default work(
Rate allocation algorithm determines multiple signal powers to be transmitted and multiple noise powers, including：
When judging that the total transmission power of itself is less than or equal to default total power threshold, based on the total transmission power of itself and
Multiple preset signals power-division ratios distribute formula using predetermined power, multiple signal powers to be transmitted and multiple are calculated
Noise power, wherein the predetermined power distributes formula and is：
It is describedFor the preset signals signal power distribution ratio, the P is the total transmission power of itself, the PsFor institute
State signal power to be transmitted, the PnFor the noise power.
6. a kind of safety of physical layer communication device based on time reversal technology, which is characterized in that described device is applied to communication
Signal sending end in system, described device include：
Acquisition module, the channel information for obtaining each path communicated with intended recipient end；
First determining module, it is described for obtaining noise signal using time reversal technology according to the channel information in each path
Noise signal is 0 in preset time point；
Signal averaging module obtains coded signal for the noise signal to be superimposed in signal to be transmitted；
Sending module sends the coded signal to the intended recipient end.
7. device according to claim 6, which is characterized in that the channel information in each path includes：The letter in each path
Road gain；
First determining module, is specifically used for：
According to the channel gain in each path, formula is determined using Preset Transfer coefficient, the noise signal that each path is calculated passes
Defeated coefficient, wherein the Preset Transfer coefficient determines that formula is：
The L is the quantity in the path communicated with the intended recipient end, and the i is the number in path, the hiFor path i's
Channel gain, the niFor the noise signal transmission coefficient of path i；
When default initial noisc signal is discrete signal, according to the noise signal transmission coefficient in each path, channel gain and pre-
If initial noisc signal, using the first default noise signal calculation formula, noise signal is calculated, wherein described first is pre-
If noise signal calculation formula is：
A '={ h [k] * n [- k] } A,
The h [k] is the channel gain hiSet, the n [- k] be the noise signal transmission coefficient niInverted order collection
It closes, the A is the default initial noisc signal, and the A ' is the noise signal；
Alternatively, when default initial noisc signal is continuous signal, according to noise signal transmission coefficient, the channel gain in each path
Noise signal is calculated using the second default noise signal calculation formula with default initial noisc signal, wherein described
Two default noise signal calculation formula are：
The h (t) is the channel gain hiSet, the n (- t) be the noise signal transmission coefficient niInverted order collection
It closes；
The Signal averaging module, is specifically used for：
When original transmission signal is discrete signal, based on original transmission signal, preset time reversion preconditioned functions and Ge Lu
The channel gain of diameter presets signal calculation formula to be transmitted using first, signal to be transmitted is calculated, wherein described first
Presetting signal calculation formula to be transmitted is：
S '={ h [k] * h*[- k] } S,
The h*[- k] is that the preset time inverts preconditioned functions, and the S is the original transmission signal, and the S' is institute
State signal to be transmitted；
Alternatively, when original transmission signal is continuous signal, based on original transmission signal, preset time reversion preconditioned functions and
The channel gain in each path presets signal calculation formula to be transmitted using second, signal to be transmitted is calculated, wherein described
Second, which presets signal calculation formula to be transmitted, is：
The h*(- t) is that the preset time inverts preconditioned functions；
Using preset signals Superposition Formula, it is superimposed the noise signal and the signal to be transmitted, obtains coded signal, wherein
The preset signals Superposition Formula is：
S'+A'。
8. device according to claim 7, which is characterized in that described device further includes：
Second determining module, for true according to multiple default first signal-to-noise ratio at the intended recipient end and default safe rate
Determine formula, using default optimal resolving Algorithm, the first preset quantity targeted security rate is calculated；According to each targeted security speed
Corresponding each default first signal-to-noise ratio of rate determines from each path and presets the corresponding each destination path of the first signal-to-noise ratio with each；
First determining module, is specifically used for：
According to the channel gain of each destination path, determines formula using goal-selling transmission coefficient, target is calculated and makes an uproar
Acoustical signal transmission coefficient, wherein the goal-selling transmission coefficient determines that formula is：
The njFor the target noise signal transmission coefficient, the M is first preset quantity, and the j is the target road
The number of diameter, the hjFor the destination channel gain of destination path j；
First determining module, is additionally operable to：
When default initial noisc signal is discrete signal, according to the target noise signal transmission coefficient of each destination path,
Target is calculated using the first goal-selling noise signal calculation formula in destination channel gain and default initial noisc signal
Noise signal, wherein the first goal-selling noise signal calculation formula is：
A "={ ha[k]*na[- k] } A,
The ha[k] is the destination channel gain hjSet, the na[- k] is the target noise signal transmission coefficient nj
Inverted order set, the A " be target noise signal；
Alternatively, when default initial noisc signal is continuous signal, according to the target noise signal transmission of each destination path
Coefficient, destination channel gain and default initial noisc signal are calculated using the second goal-selling noise signal calculation formula
Target noise signal, wherein the second goal-selling noise signal calculation formula is：
The ha(t) it is the destination channel gain hjSet, the na(- t) is the target noise signal transmission coefficient nj
Inverted order set；
The Signal averaging module, is specifically used for：
When original transmission signal is discrete signal, based on original transmission signal, goal-selling time reversal preconditioned functions and
The destination channel gain of each destination path presets echo signal calculation formula to be transmitted using first, mesh to be transmitted is calculated
Mark signal, wherein described first, which presets echo signal calculation formula to be transmitted, is：
It is describedFor the goal-selling time reversal preconditioned functions, the S " is echo signal to be transmitted；
Alternatively, when original transmission signal is continuous signal, based on original transmission signal, preset time reversion preconditioned functions and
The channel gain in each path presets signal calculation formula to be transmitted using second, signal to be transmitted is calculated, wherein described
Second, which presets signal calculation formula to be transmitted, is：
It is describedFor the goal-selling time reversal preconditioned functions；
The Signal averaging module, is additionally operable to：
Using goal-selling Signal averaging formula, it is superimposed the target noise signal and the echo signal to be transmitted, obtains mesh
Mark coded signal, wherein the goal-selling Signal averaging formula is：
S″+A″；
The sending module, is specifically used for：
The target coded signal is sent to the intended recipient end.
9. device according to claim 8, which is characterized in that second determining module is specifically used for：
According to the total transmission power of itself, using predetermined power allocation algorithm, determines multiple signal powers to be transmitted and multiple make an uproar
Acoustical signal power；
For each signal power to be transmitted and each noise power, by the signal power to be transmitted and corresponding noise signal
The ratio of power is determined as default first signal-to-noise ratio；
It is true using default safe rate according to each default first signal-to-noise ratio and multiple default second signal-to-noise ratio at illicit reception end
Determine formula, multiple safe rates are calculated；
The size for comparing each safe rate determines the first preset quantity safety speed according to the sequence of safe rate from big to small
Rate, as targeted security rate；
Wherein, default safe rate determines that formula is：
Rs=[log2(1+SNRd)-log2(1+SNRe)]+,
The SNRdFor default first signal-to-noise ratio, the SNReIt makes an uproar ratio for described default second.
10. device according to claim 9, which is characterized in that second determining module is additionally operable to：
When judging that the total transmission power of itself is less than or equal to default total power threshold, based on the total transmission power of itself and
Multiple preset signals power-division ratios distribute formula using predetermined power, multiple signal powers to be transmitted and multiple are calculated
Noise power, wherein the predetermined power distributes formula and is：
It is describedFor the preset signals signal power distribution ratio, the P is the total transmission power of itself, the PsFor institute
State signal power to be transmitted, the PnFor the noise power.
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