CN108365880A - A kind of multi-user's security information energy synchronous transmission method - Google Patents
A kind of multi-user's security information energy synchronous transmission method Download PDFInfo
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- CN108365880A CN108365880A CN201810076000.8A CN201810076000A CN108365880A CN 108365880 A CN108365880 A CN 108365880A CN 201810076000 A CN201810076000 A CN 201810076000A CN 108365880 A CN108365880 A CN 108365880A
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- information
- energy
- signal
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- acceptance person
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
-
- 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
Abstract
The invention discloses a kind of multi-user's security information energy synchronous transmission methods, include the following steps：The confidential information signal that artificial redundant signals are added by robust Beamforming technology while being sent to multiple information receivers, energy acceptance person and invalid information listener-in by the information energy sender equipped with more antennas, and multiple information receivers, energy acceptance person and invalid information listener-in is made to receive preset signal respectively.Information energy sender sends confidential information by the Beamforming technology of more antennas in the present invention, it orients to multiple legal information receivers and transmits confidential information signals, it is therefore an objective to enable that multiple legal information receivers receive stronger confidential information signal and energy acceptance person and listener-in on other directions receive weaker confidential information signal.
Description
Technical field
The present invention considers that the nonlinear energy closer to actual conditions receives model and has the channel parameter estimation item of error
Under part, a kind of multi-user's security information energy simultaneous interpretation for the safety of physical layer can adapt to the requirement of information energy simultaneous transmission is provided
Method.
Background technology
It is wireless take can communicate (Simultaneous Wireless Information and Power Transfer,
SWIPT it is) a kind of novel wireless communication type, is different from traditional wireless communication and only propagates information, wirelessly takes that can communicate can
To transmit energy signal when propagating conventional information class wireless signal, while to wireless device, energy signal is by with capacitation
After the wireless device of circuit receives, wireless energy can be stored in the battery of wireless device itself by a series of conversions,
The energy of these captures will be used for energy consumption and the energy capture circuit of the normal information exchange circuit of the wireless device
Energy consumption.After wirelessly taking the energy communication technology, it is possible to reduce electric wire, the cost of winding displacement can remove from and be replaced to wireless device
The trouble of battery.
It is wireless to take that communicate be by wireless energy transfer (Wireless Power Transfer, WPT) and wireless messages biography
The product that defeated (wireless information transmission, wit) is combined, and it is expected to " one-plus-one is more than two ".It will
WPT with wit technologies be combined be substance essential attribute embodiment, will further expand its respective application field, be people
Life bring far-reaching change.
This distinguishing feature is transmitted based on information and energy parallel, SWIPT technologies are expected to be widely used for high-speed radio-frequency label
Information exchange between (radio frequency identification, RFID), Internet of Things and all kinds of mobile terminals with
Energy transmission is expected to while realizing that high speed information exchanges, and the energy efficient in signal is received to various ends by extraction
End equipment is fed, inconvenient caused by traditional wire or battery powered to replace, and reduces the volume and cost of terminal device,
And greatly extend its stand-by time, particularly suitable for the application for the terminal node for needing to dispense on a large scale.
It is wireless to take that communicate mostly be based on linear energy collection model, the i.e. RF-EH (Radio of hypothesis energy acceptance person
Frequency Energy Harvesting, RF energy collecting circuit) radiofrequency signal is transformed into the conversion ratio of direct current is solid
Definite value.And it is demonstrated experimentally that the conversion ratio of practical RF-EH circuits is not fixed value, but with input rf signal changed power and
Variation.This so that collecting the wireless portable communications system design that model carries out based on linear energy deviates actual conditions, with reality
There is relatively large deviation in border application.And current wireless take can communicate mostly only one information receiver of consideration or recipient only
There is the case where single antenna, does not account for the information privacy transmission under occasion existing for illegal wiretapping person, this wirelessly to take energy
Communication system applications scene receives considerable restraint.And wireless portable communications system designs many at present assume that transmitting terminal can be completely
Channel parameter information is obtained, this is also impossible in practice.
In view of this, a kind of closer practical RF-EH circuit characteristics of urgent need offer and the wireless of channel situation are taken and can be communicated
System design approach realizes one-to-many multi-user's security information energy synchronous transmission method.
Invention content
In order to solve the above-mentioned technical problem, there is provided a kind of multi-user's security information for the technical solution adopted in the present invention
Energy synchronous transmission method, includes the following steps：
The confidential information signal that artificial redundant signals are added is passed through Shandong by the information energy sender equipped with more antennas
Stick Beamforming technology is sent to multiple information receivers, energy acceptance person and invalid information listener-in simultaneously, makes respectively multiple
Information receiver, energy acceptance person and invalid information listener-in receive preset signal；Plurality of information receiver can
Confidential information is received by preset rate decoded signal, multiple energy acceptance persons can receive signal by preset power and be converted into
Energy but cannot by decode received signal obtain confidential information, multiple invalid information listener-ins can not pass through decode receive
Signal obtains confidential information.
In the above-mentioned methods, N is arranged in described information energy senderTSingle antenna, institute is arranged in root antenna, described information recipient
Stating energy acceptance, N is arranged in personRSingle antenna is arranged in root antenna, invalid information listener-in；N-th of information receiver is respectively represented with n, s, k,
S-th of energy acceptance person and k-th of invalid information listener-in, i.e.,
In the above-mentioned methods, information energy sender transmission signal is
Wherein,Received signal is preset for n-th of information receiver, without loss of generalityVector is shaped for respective beam；For first Gaussian distributed
Artificial redundant signalsShared L artificial redundant signals (NT≥
L)；
Information energy sender's transmission power is
N-th of information receiver's received signal be
Wherein,Received signal is preset for the n-th ' a information receiver,It does not lose
It is generalVector is shaped for respective beam；
S-th of energy acceptance person's received signal be
K-th of invalid information listener-in's received signal be
Wherein,Point
Not Wei n-th of information receiver, the additive white Gaussian noise at s-th of energy acceptance person and k-th of invalid information listener-in, σ2
For noise power.
4 in the above-mentioned methods, described information energy sender to information receiver, energy acceptance person and invalid information eavesdropping
The channel parameter vector of person is made of channel estimation and channel errors：
Channel estimation is respectivelyWith
Channel errors are respectivelyWith
Information energy sender and n-th of information receiver, between s-th of energy acceptance person and k-th of invalid information listener-in
Channel parameter vector is respectivelyWithAnd each channel errors are in certain model
Within enclosing, specially：
In the above-mentioned methods, n-th of information receiver's received signal Signal to Interference plus Noise Ratio is：
Wherein,For the corresponding beamforming vectors of m-th of information receiver,That is m can be with
For other N-1 information receiver in addition to n-th of information receiver；
S-th of energy acceptance person's received signal Signal to Interference plus Noise Ratio be：
K-th of invalid information listener-in's received signal Signal to Interference plus Noise Ratio be：
S-th of energy acceptance person receive RF signal powers be：
S-th of energy acceptance person receive energy be：
In formula, η is the conversion ratio that RF signals are transformed into direct current by RF-EH circuits, 0 η≤1 ＜；
In formula, ΨsForLogical function, MsIt is the collection of energy of s-th of energy acceptance person
The maximum direct current that circuit can export, as,bsIt is and the relevant constant of the energy collection circuit of s-th of energy acceptance person.
In the above-mentioned methods, the power of information energy sender minimum sends signal, then needs the setting wave beam optimized
Forming vector and artificial redundant signals vector, that is, determineOptimal solution,For N number of information receiver
The ordered set of N number of element of corresponding N number of beamforming vectors composition；For the artificial redundancy of L Gaussian distributed
The ordered set of L element of signal composition；Following constraintss should be met：
1）N-th of information receiver's received signal Signal to Interference plus Noise Ratio is more than preset threshold gamman, then n-th of information
Recipient smoothly can obtain information by decoded signal；
2）S-th of energy acceptance person's received signal Signal to Interference plus Noise Ratio is less than preset threshold value ωs, then s-th of energy
Recipient smoothly cannot obtain information by decoded signal, while the energy that s-th of energy acceptance person receives is more than preset,
Then s-th of energy acceptance person can obtain the energy of needs；
3）K-th of invalid information listener-in's received signal Signal to Interference plus Noise Ratio is less than preset threshold value φk, make k-th
Invalid information listener-in smoothly cannot obtain information by decoded signal, you can determine optimal solution.
In the above-mentioned methods, the constraints, which can be converted into, solves following formula P0：
The solution for solving P0 is specific as follows：
It enablesIt willWith
It substitutes into P0 and constraints is converted into semidefinite decoding (SEMI.DEFINITERELAXATION, SDR) form, converted
Problem P1 afterwards：
Introduce positive slack variableAnd utilize the S- in convex optimization tool
Procedure processing converts P1 to P2：
The optimal solution that P2 is directly found out with convex Optimization Solution tool isIfThen
Pass through rank-one matrix decompositionsIt acquiresObtain P2 optimal solutions；IfThen
It is obtained by Gaussian random process approximationObtain P2 approximate optimal solutions.
Information energy sender sends confidential information by the Beamforming technology of more antennas in the present invention, orients to more
A legal information receiver transmits confidential information signal, it is therefore an objective to multiple legal information receivers be enable to receive stronger machine
Secret letter information signal and energy acceptance person and listener-in on other directions receive weaker confidential information signal.
Information energy sender sends multiple artificial redundant signals by the Beamforming technology of more antennas
(multipleartificial redundant signal, MARS) is oriented to multiple energy acceptance persons and listener-in transmission people
Work redundant signals, it is therefore an objective to enable multiple energy acceptance persons and listener-in to receive stronger artificial redundant signals and multiple legal
Information receiver receives weaker artificial redundant signals.Operation in this way, legal information receiver receive strong machine
Secret letter information signal and weak artificial redundant signals, Signal to Interference plus Noise Ratio is high, can decode confidential information；And energy acceptance person and eavesdropping
Person receives weak confidential information signal and strong artificial redundant signals, and Signal to Interference plus Noise Ratio is low, can not decode confidential information, while energy
It measures recipient and carries out collection of energy using the strong artificial redundant signals received.
Description of the drawings
Fig. 1 is embodiment scene framework schematic diagram provided by the invention.
Specific implementation mode
The present invention provides a kind of multi-user's security information energy synchronous transmission method, one is may be implemented equipped with more antennas
Information energy sender pacifies to multiple legal information receivers (IR, information receiver) equipped with single antenna
Full transmission confidential information, and consider that the nonlinear energy closer to actual conditions receives model and has the channel parameter estimation of error
Under the conditions of, there is the design of the information energy simultaneous transmission system of the rate of information throughput and energy acceptance power constraint and information security,
Legal information receiver is set to receive information by the rate of design, and in addition to other recipients of legal information receiver
Physically (Signal to Interference plus Noise Ratio) cannot be correctly decoded information；Simultaneously to it is multiple equipped with more antennas energy acceptance person (ER,
Energy receiver) transmission energy, it is desirable that multiple energy acceptance persons can receive energy by the power of design；Transmit ring
There are multiple in the border invalid information listener-in (Eve, eavesdropper) equipped with single antenna, it is desirable that they are physically
(Signal to Interference plus Noise Ratio) can not obtain information.The present invention is made specifically with Figure of description With reference to embodiment
It is bright.
The present invention provides a kind of multi-user's security information energy synchronous transmission methods, include the following steps：
Information energy sender equipped with more antennas will simultaneously be sent by the robust wave beam that artificial redundant signals are added
To multiple information receivers, energy acceptance person and listener-in, respectively connect multiple information receivers, energy acceptance person and listener-in
Receive preset information；Plurality of legal information receiver can receive information, multiple energy acceptances by preset rate
Person can be received energy by preset power and multiple illegal listening in information persons can not obtain the information of any transmission, purpose
It is to enable that multiple energy acceptance persons and listener-in receive stronger artificial redundant signals and multiple legal information receivers receive
Weaker artificial redundant signals.
Illustrate the present invention below by specific embodiment.
As shown in Figure 1, illustrate the present invention by taking Fig. 1 scenes as an example, including one is equipped with NTThe information energy of root antenna is sent
Person, N number of legal information receiver equipped with single antenna, S are equipped with NRThe energy acceptance person of root antenna and K are a equipped with single day
The invalid information listener-in of line.N-th of information receiver, s-th of energy acceptance person and k-th of invalid information are respectively represented with n, s, k
Listener-in, therefore
Respectively information receiver gathers, energy acceptance person set and invalid information listener-in set.The conjugate transposition of matrix A, order,
Mark, determinant use A respectivelyH, Rank (A), Tr (A) and det (A) indicate that the representing matrixes of A >=0 A is a positive semidefinite matrix
(positive semidefinite (PSD) matrix), I indicate unit matrix,Indicate the statistical expection of x,Indicate that complex field, N-dimensional be complex vector located, complex matrixs of N rows M row respectively,Expression mean value is the side x
Difference is the Gaussian Profile of y.
It enablesWithInformation energy sender is respectively represented to connect with n information
Receipts person, the channel parameter vector between s-th of energy acceptance person and k-th of invalid information listener-in.But in systems in practice, by
In channel fading, the variation of sending and receiving end relative position, the limitation of computing capability and feedback channel capacity, sender can not obtain accurately
Channel parameter vector, the channel parameter vector that information energy sender obtains is made of channel estimation and channel errors, therefore
Channel estimation is respectively WithChannel errors are respectively WithTherefore, information energy sender and n-th of information receiver, s-th of energy acceptance person and kth
Channel parameter vector between a invalid information listener-in is respectively WithAnd each letter
Road error within limits, specially：
Information energy sender sends signalIt is connect for n-th of information
Receipts person presets received signal, without loss of generality；Wherein,For respective beam shape to
Amount；For the artificial redundant signals of first of Gaussian distributedFor Gauss
The variance of distribution),Shared L artificial redundant signals (NT≥L).Wherein,
Then information energy sender transmission power is
N-th of information receiver's received signal be
Wherein,Received signal is preset for the n-th ' a information receiver,It does not lose
It is generalVector is shaped for respective beam.
S-th of energy acceptance person's received signal be
K-th of invalid information listener-in's received signal be
Wherein,Point
Not Wei n-th of information receiver, the additive white Gaussian noise at s-th of energy acceptance person and k-th of invalid information listener-in
(additive white Gaussian Noises, AWGN), σ2For noise power.
Then n-th of information receiver's received signal Signal to Interference plus Noise Ratio is：
Wherein,For the corresponding beamforming vectors of m-th of information receiver,That is m can be with
For other N-1 information receiver in addition to n-th of information receiver；
S-th of energy acceptance person's received signal Signal to Interference plus Noise Ratio be：
K-th of invalid information listener-in's received signal Signal to Interference plus Noise Ratio be：
S-th of energy acceptance person receive RF signal powers be：
S-th of energy acceptance person receive energy be
In formula, η is the conversion ratio that RF signals are transformed into direct current by RF-EH circuits, 0 η≤1 ＜.
It is contemplated that collecting model, i.e. η not instead of fixed values, with input rf signal closer to actual nonlinear energy
Changed power and change, then s-th of energy acceptance person receive energy be represented by：
ΨsForLogical function, MsFor the energy collection circuit energy of s-th of energy acceptance person
The maximum direct current of output, as,bsIt is and the relevant constant of the energy collection circuit of s-th of energy acceptance person.
In the present embodiment, to make the power of information energy sender minimum send signal, then problem to be solved
It is the setting beamforming vectors how to optimize and artificial redundant signals vector, that is, determinesIt is optimal
Solution, should meet following conditions：
1), n-th of information receiver's received signal Signal to Interference plus Noise Ratio is more than preset threshold gamman, then n-th of information
Recipient smoothly can obtain information by decoded signal；
2), s-th of energy acceptance person's received signal Signal to Interference plus Noise Ratio is less than preset threshold value ωs, then s-th of energy
Recipient smoothly cannot obtain information by decoded signal, while the energy that s-th of energy acceptance person receives is more than preset threshold
Value, then s-th of energy acceptance person can obtain the energy of needs；
3), k-th of invalid information listener-in's received signal Signal to Interference plus Noise Ratio is less than preset threshold value φk, make k-th
Invalid information listener-in smoothly cannot obtain information by decoded signal, you can determine optimal solution.
The problem of the above-mentioned setting beamforming vectors how to optimize and artificial redundant signals vector can be converted into solution
Following formula P0：
The solution for solving above-mentioned formula is specific as follows：
It enablesIt willWith
It substitutes into P0 and constraints is converted into semidefinite decoding (SemiDefiniteRelaxation, SDR) form, after obtaining conversion
Formula P1：
By introducing positive slack variableAnd utilize the S- in convex optimization tool
Procedure processing converts formula P1 to P2：
Above-mentioned P2 is the convex optimization problem of standard, is directly found out with convex Optimization Solution tool (CVX, SeduMi) optimal
Xie WeiIfRank-one matrix decompositions can be passed throughIt acquires
Then obtain former problem P0 optimal solutions；IfThen pass through Gaussian random process (Gaussian
Randomization procedure) approximation acquisitionThen obtain former problem P0 approximate optimal solutions.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn that the knots made under the inspiration of the present invention
Structure changes, and the technical schemes that are same or similar to the present invention are each fallen within protection scope of the present invention.
Claims (7)
1. a kind of multi-user's security information energy synchronous transmission method, which is characterized in that include the following steps：Equipped with more antennas
The confidential information signal that artificial redundant signals are added by robust Beamforming technology while being sent to by information energy sender
Multiple information receivers, energy acceptance person and invalid information listener-in make multiple information receivers, energy acceptance person and non-respectively
Method listening in information person receives preset signal；Plurality of information receiver can be by preset rate decoded signal receiver
Confidential information, multiple energy acceptance persons can be received the letter that signal is converted into energy but cannot be received by decoding by preset power
Number obtain confidential information, multiple invalid information listener-ins can not pass through decode received signal obtain confidential information.
2. the method as described in claim 1, which is characterized in that N is arranged in described information energy senderTRoot antenna, described information connect
Single antenna is arranged in receipts person, and N is arranged in the energy acceptance personRSingle antenna is arranged in root antenna, invalid information listener-in；With n, s, k points
N-th of information receiver, s-th of energy acceptance person and k-th of invalid information listener-in are not represented, i.e., Respectively information receiver gathers, energy acceptance
Person gathers and invalid information listener-in set.
3. method as claimed in claim 2, which is characterized in that information energy sender sends signal and is
Wherein,Received signal is preset for n-th of information receiver, without loss of generality Vector is shaped for respective beam；For the artificial redundant signals of first of Gaussian distributedΣl>=0 is the variance of Gaussian Profile；Shared L artificial redundant signals (NT
≥L)；
Information energy sender's transmission power is
N-th of information receiver's received signal be
Wherein,Received signal is preset for the n-th ' a information receiver,It does not lose general
PropertyVector is shaped for respective beam；
S-th of energy acceptance person's received signal be
K-th of invalid information listener-in's received signal be
Wherein,Respectively
Additive white Gaussian noise at n-th of information receiver, s-th of energy acceptance person and k-th of invalid information listener-in, σ2To make an uproar
Acoustical power.
4. method as claimed in claim 3, which is characterized in that described information energy sender to information receiver, energy connect
The channel parameter vector of receipts person and invalid information listener-in are made of channel estimation and channel errors：
Channel estimation is respectivelyWith
Channel errors are respectivelyWith
Information energy sender and n-th of information receiver, the letter between s-th of energy acceptance person and k-th of invalid information listener-in
Road parameter vector is respectivelyWithAnd each channel errors are in certain model
Within enclosing, specially：
5. method as claimed in claim 3, which is characterized in that n-th of information receiver's received signal Signal to Interference plus Noise Ratio be：
Wherein,For the corresponding beamforming vectors of m-th of information receiver,That is m can be except
Other N-1 information receiver outside n-th of information receiver；
S-th of energy acceptance person's received signal Signal to Interference plus Noise Ratio be：
K-th of invalid information listener-in's received signal Signal to Interference plus Noise Ratio be：
S-th of energy acceptance person receive radiofrequency signal (RF, Radio Frequency) power be：
S-th of energy acceptance person receive energy be：Φs=η Ps (ER),
In formula, η is that radiofrequency signal is transformed into the conversion ratio of direct current, 0 η≤1 ＜ by the RF-EH circuits of energy acceptance person；
Consider to collect model, i.e. η not instead of fixed values, with input rf signal changed power closer to actual nonlinear energy
And change, then the energy that s-th of energy acceptance person receives is represented by：
In formula, ΨsForLogical function, MsIt is the energy collection circuit energy of s-th of energy acceptance person
The maximum direct current of output, as,bsIt is and the relevant constant of the energy collection circuit of s-th of energy acceptance person.
6. method as claimed in claim 5, which is characterized in that the power of information energy sender's minimum sends signal, then
The setting beamforming vectors that need to be optimized and artificial redundant signals vector, that is, determineOptimal solution,For the ordered set of N number of element of the corresponding N number of beamforming vectors composition of N number of information receiver；It is L
The ordered set of L element of the artificial redundant signals composition of Gaussian distributed, should meet following constraintss：
1) n-th of information receiver's received signal Signal to Interference plus Noise Ratio is more than preset threshold gamman, then n-th of information receiver
Smoothly confidential information can be obtained by decoded signal；
2) s-th of energy acceptance person's received signal Signal to Interference plus Noise Ratio is less than preset threshold value ωs, then s-th of energy acceptance person
Smoothly confidential information cannot be obtained by decoded signal, while the energy that s-th of energy acceptance person receives is more than preset threshold valueThen s-th of energy acceptance person can obtain the energy of needs；
3) k-th of invalid information listener-in's received signal Signal to Interference plus Noise Ratio is less than preset threshold value φk, make k-th of illegal letter
Ceasing listener-in smoothly cannot obtain confidential information by decoded signal, you can determine optimal solution.
7. method as claimed in claim 6, which is characterized in that the constraints, which can be converted into, solves following formula P0：
The method for solving P0 is specific as follows：
It enablesIt willWith
It substitutes into P0 and constraints is converted into semidefinite decoding (SemiDefinite Relaxation, SDR) form, converted
Problem P1 afterwards：
Introduce positive slack variableAnd utilize the S-procedure in convex optimization tool
Processing, converts problem P1 to P2：
The optimal solution that P2 is directly found out with convex Optimization Solution tool isIfThen pass through
Rank-one matrix decompositionsIt acquiresObtain P2 optimal solutions；IfThen pass through height
This random process approximation obtainsObtain P2 approximate optimal solutions.
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