CN106454838A - Energy harvesting relay safety transmission method adopting artificial noise precoding - Google Patents
Energy harvesting relay safety transmission method adopting artificial noise precoding Download PDFInfo
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- CN106454838A CN106454838A CN201610858223.0A CN201610858223A CN106454838A CN 106454838 A CN106454838 A CN 106454838A CN 201610858223 A CN201610858223 A CN 201610858223A CN 106454838 A CN106454838 A CN 106454838A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/08—Access security
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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
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
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- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses an energy harvesting relay safety transmission method adopting artificial noise precoding, which is applied to a system including four nodes that are a source, a relay, a sink and a wiretapper. The system requires two time slots to complete transmission. In the first time slot, the source broadcasts signals, the sink and the wiretapper receive the signals, and the relay adopts the maximal ratio to combine received signals, harvest energy and receives a secrecy signal. In the second time slot, the relay obtains state information of a channel from the relay to the sink, an artificial noise auxiliary precoding strategy is adopted to carry out precoding of secrecy information and artificial noise, then an amplification forwarding protocol is used for forwarding coding signals, the sink and the wiretapper receive the coding signals, and the received signals during the two time slots are combined at the maximal ratio. The relay safety transmission method applies artificial noise auxiliary precoding to an energy harvesting relay adopting power distribution, so that the remote transmission system limited in energy is enabled to have the great safety transmission performance.
Description
Technical field
The present invention relates to radio communication and safety of physical layer field, more particularly to a kind of energy of employing man made noise precoding
Amount collection relaying safe transmission method.
Background technology
Further requirement of the user for being brought with the fast development of wireless communication technology to service quality, communication security
Become important focus.In wireless communications, traditional cipher mode is limited to stronger and stronger hardware and cloud meter
Calculation ability, it is difficult to adapt to the wireless security communication of following more high speed.If can protect to information in signal transmission,
The safety of information transfer can be just significantly increased, therefore, radio communication safety of physical layer technology is multiple using wireless channel environment
Miscellaneous spatial character and time-varying characteristics, directly ensure letter using the method such as man made noise's scrambling or opportunistic transmission from physical layer
The safe transmission of breath.Man made noise's auxiliary precoding is a kind of technology for adding man made noise in signal transmission, the technology profit
With the channel condition information of two trusted nodes, auxiliary is carried out using kernel vector and prelist, can be effectively to listener-in
Disturbed, improved the safe transmission performance of system.
In order to application of the radio communication on regional space is further expanded, and reduce the maintenance cost of system, improve and lead to
Service life of letter system etc., radio communication energy acquisition technology is widely paid close attention to.In region, the remote energy that is not suitable for is passed
In the defeated or moveable communication node built temporarily, can avoid changing the later stages such as battery, charging using energy acquisition technology
Maintenance cost, and be greatly enhanced mobility and the spatial adaptation ability of system.By energy acquisition Technology application to wirelessly
It is a very significant research contents in collaboration relay system, wireless cooperation junction network can expand the scope of communication,
And it is weak to be effectively improved the signal in communication process.In radio communication safety of physical layer, cooperative relaying network also plays important
Effect, such as by opportunistic relay selection, relaying man made noise's scrambling etc., can improve the security performance of system.Therefore, by energy
It is a research topic for meriting attention that amount acquisition technique is applied to cooperative relaying.
The design of pre-coding scheme is aided in cooperative relaying network using man made noise by energy acquisition relaying, this
A kind of bright energy acquisition relaying safe transmission scheme for proposing employing man made noise precoding.The scheme of the invention is in cooperative relaying
In, employing work(and divide energy acquisition technology and man made noise that the method that prelists is aided in, application amplification forwarding agreement carries out turning to signal
Send out, limit such that it is able to the safety for effectively improving information transfer and the regional space for breaking through wireless security communication.
Content of the invention
It is an object of the invention to overcoming the deficiencies in the prior art, proposing a kind of energy using man made noise's precoding and adopting
Collection relaying safe transmission method, by cooperative relaying, pre- using power distribution energy acquisition technology and man made noise's auxiliary
Volume method, application amplification forwarding agreement is forwarded to signal, can effectively be resisted eavesdropping, listener-in be disturbed, is carried
The regional space of the safety of high information transfer and breakthrough wireless security communication is limited.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of employing man made noise precoding energy acquisition relaying safe transmission method, apply include information source, relaying,
In the wireless communication system of the stay of two nights and four nodes of listener-in, some antennas of the link deployment, remaining node all configures list
Antenna, the transmission of the wireless communication system is divided into two time slots and completes, and method includes：
In the first time slot, the secret signal of information source broadcast packet energy content, relay using maximum-ratio combing to secret signal
Carry out energy acquisition and reception；While the stay of two nights and listener-in also receive the signal of information source broadcast；
In the second time slot, relaying obtains the kernel vector of its channel condition information for arriving the stay of two nights and channel parameter, and
Carry out man made noise's auxiliary precoding, the signal after the energy amplification forwarding precoding for recycling the first time slot to be collected；Letter
Place and listener-in receive the signal after the precoding of relay forwarding；
The stay of two nights and listener-in are respectively adopted the reception signal of the first time slot described in maximum-ratio combing and second time slot, and
The received signal to noise ratio of the stay of two nights and the received signal to noise ratio of listener-in are obtained respectively；
The wireless communication system is calculated based on the received signal to noise ratio for receiving stay of two nights ratio and listener-in of the stay of two nights
Instantaneous safe rate；Ask mathematic expectaion to obtain average security speed to the instantaneous safe rate；
Based on the average security speed, the optimal energy collection power distribution of maximum average security speed is obtained further
The factor and optimum pre-coding power distribution factor.
Further, the energy that in the first time slot, relaying is collected is represented with following manner：
In first time slot relay reception to signal represented with following manner：
Wherein, 0<η<1, represent the efficiency of energy acquisition；T represents transmission time slot total length, dSRRepresent information source to relaying
Distance, m represents path-loss factor, PSRepresent information source transmit power；0<ρ<1, represent energy acquisition power allocation factor；hSRFor
1 × N-dimensional vector, represents information source to trunk channel vector, and wherein N is the antenna number of relaying；||hSR| | representing, 2- model is sought to vector
Number, x represents secret signal, subscriptRepresent and ask conjugate transpose, nRFor 1 × N vector, represent the additive white gaussian of relay reception
Noise vector.
Further, the information source broadcast singal that in the first time slot, the stay of two nights is received is represented with following manner：
The information source broadcast singal that in first time slot, listener-in receives is represented with following manner：
Wherein, dSDAnd dSERepresent information source to the stay of two nights and information source to the distance of listener-in, h respectivelySDAnd hSERepresent information source respectively
To the stay of two nights and information source to the channel coefficients of listener-in, nD1And nE1Represent the reception additive Gaussian white noise of the stay of two nights and listener-in respectively
Sound, variance is respectivelyWith
Further, the signal after the second time slot precoding is represented with following manner：
xR=w1yR+W2v
Wherein, w1=hRD/||hRD| |, hRDFor N × 1 dimensional vector, represent the channel vector for being relayed to the stay of two nights；W2For N × (N-
1) matrix is tieed up, represents hRDNull space matrix；V is the dimensional vector of (N-1) × 1, represents Human disturbance noise vector, each of which point
Measure as independent identically distributed additive white Gaussian noise coefficient, and variance isα represents that pre-coding power distributes
The factor,Represent the total transmit power of relaying.
Further, the signal in the second time slot after the precoding of the relay forwarding that the stay of two nights is received is represented with following manner：
Signal in second time slot after the precoding of the relay forwarding that listener-in receives is represented with following manner：
Wherein, β is the amplification forwarding factor, to meet Table
Show and mathematic expectaion is sought, dRDAnd dRERepresent respectively and be relayed to the stay of two nights and be relayed to the distance of listener-in；hREFor N × 1 dimensional vector, table
Show the channel vector for being relayed to listener-in；nD2And nE2Represent the reception additive white Gaussian noise of the stay of two nights and listener-in, variance respectively
RespectivelyWith
Further, the received signal to noise ratio of the stay of two nights is represented with following manner：
The received signal to noise ratio of the listener-in is represented with following manner：
Further, the instantaneous safe rate is represented with following manner：
CS=max { CD-CE,0}
Wherein,
To CSMathematic expectaion is asked to obtain average security speed：
Further, the method that is looked for one's roots using numerical value is adjusted to the ρ and α, is obtained in preset energy collecting efficiency
Under conditions of, in information source transmit power, secret signal accounts for general power PSOptimal proportion and relaying when carrying out precoding mode and processing
Secret signal accounts for general power PROptimal proportion, and then obtain obtaining the best transmission scheme of maximum average security speed.
The present invention has the advantages that：
(1) present invention is relayed using energy acquisition, can effectively expansion relays range of application, and reduce practical application
Later maintenance cost；
(2) amplification forwarding trunk protocol and man made noise's auxiliary pre-coding scheme present invention employs, and improve transmission has
Effect property and reliability, such that it is able to the transmission safety of effective guarantee information；
(3) some antennas of link deployment of the present invention, improve the security performance of system further；
(4) by the acquisition of average security speed；The optimal energy for further obtaining obtaining maximum average security speed is adopted
Collection power allocation factor and optimum pre-coding power distribution factor.
Below in conjunction with drawings and Examples, the present invention is described in further detail, but one kind of the present invention is using manually making an uproar
The energy acquisition relaying safe transmission method of sound precoding is not limited to embodiment.
Description of the drawings
The system block diagram that Fig. 1 is applied by the inventive method；
Fig. 2 is the FB(flow block) of the inventive method；
Fig. 3 is the energy acquisition power distribution schematic diagram relevant with method for precoding in whole transmission time slot；
Fig. 4 is embodied as flow chart for the inventive method；
Fig. 5 is the average security speed of the inventive method with the average noise of relaying single antenna under different relay antenna numbers
Compare change schematic diagram；
Fig. 6 is the average security speed of the inventive method with energy acquisition under different relaying single antenna average signal-to-noise ratios
Power allocation factor change schematic diagram；
Fig. 7 aids in precoding with man made noise for the average security speed of the inventive method under different relay antenna numbers
Power allocation factor change schematic diagram.
Specific embodiment
As shown in Figure 1 to Figure 3, the energy acquisition relaying safe transmission method of a kind of employing man made noise precoding, application
In the wireless communication system for including information source S, relaying R, stay of two nights D and tetra- nodes of listener-in E, wherein, if the link deployment
Dry root antenna, remaining node all configures single antenna, and the transmission of the wireless communication system is divided into two time slots and completes one-way communication
Transmission.First time slot, the signal of information source broadcast packet energy content and security information, the stay of two nights and listener-in receive signal, and relaying is adopted
Maximum-ratio combing receives signal and collecting energy and reception secret signal；Second time slot, relaying obtains the channel shape which arrives the stay of two nights
State information, and security information is carried out with man made noise by precoding using man made noise's auxiliary precoding strategy, then with amplification
Retransmission protocol forwards the encoded signal, the stay of two nights and listener-in to receive the signal, and the reception using two time slots of maximum-ratio combing
Signal.Then the received signal to noise ratio of the stay of two nights and the received signal to noise ratio of listener-in are obtained；Reception stay of two nights ratio based on the stay of two nights and
The received signal to noise ratio of listener-in calculates the instantaneous safe rate of the wireless communication system；Again the instantaneous safe rate is asked
Mathematic expectaion obtains average security speed；Based on the average security speed, maximum average security speed is obtained further most
Excellent energy acquisition power allocation factor and optimum pre-coding power distribution factor.
As shown in figure 4, a kind of energy acquisition relaying safe transmission side of employing man made noise precoding of present invention offer
Method, specifically includes following steps：
Step 401, in the first time slot, the secret signal of information source broadcast packet energy content, relay using maximum-ratio combing pair
Secret signal carries out energy acquisition and reception；While the stay of two nights and listener-in also receive the signal of information source broadcast.
Specifically, ignore the trickle energy being lost during signals collecting, relay gathered energy and the signal difference for receiving
It is expressed as：
Wherein, η (0<η<1) represent the efficiency of energy acquisition, T represents transmission time slot total length, dSRRepresent information source to relaying
Distance, m be path-loss factor, PSFor information source transmit power, ρ (0<ρ<1) be collection energy and receive signal shared by energy
The ratio (i.e. energy acquisition power allocation factor) of amount, hSR(1 × N-dimensional) is the antenna of relaying for information source to trunk channel vector, N
Number, | | | | representing and 2- norm being sought to vector, x represents secret signal, subscriptRepresent and ask conjugate transpose, nRFor relay reception
1 × N-dimensional additive white Gaussian noise vector.
The information source that the stay of two nights is received and the broadcast singal that listener-in receives are represented with following manner respectively：
Wherein, dSDAnd dSERepresent information source to the stay of two nights and information source to the distance of listener-in, h respectivelySDAnd hSERepresent information source respectively
To the stay of two nights and information source to the channel coefficients of listener-in, nD1And nE1Represent the reception additive Gaussian white noise of the stay of two nights and listener-in respectively
Sound, variance is respectivelyWith
Step 402, in the second time slot, relaying obtains the kernel of its channel condition information for arriving the stay of two nights and channel parameter
Vector, and man made noise's auxiliary precoding is carried out, after the energy amplification forwarding precoding for recycling the first time slot to be collected
Signal；The stay of two nights and listener-in receive the signal after the precoding of relay forwarding.
Specifically, relaying obtains the channel condition information which arrives the stay of two nights, and carries out man made noise's auxiliary precoding, is compiled
Signal after code is xR=w1yR+W2V, wherein, w1=hRD/||hRD| |, hRD(N × 1 dimension) is the channel vector for being relayed to the stay of two nights,
W2(N × (N-1) dimension) is hRDNull space matrix, v (dimension of (N-1) × 1) for artificial interference noise vector, each of which component is
Independent identically distributed additive white Gaussian noise coefficient, and variance isα is to account for for the power of secret signal
The ratio (i.e. pre-coding power distribution factor) of total transmit power is relayed,For relaying total transmit power,
Followed by the amplification forwarding protocol forward signal.
Signal after the precoding of the relay forwarding that the stay of two nights and listener-in receive is represented with following manner respectively：
Wherein, β is the amplification forwarding factor, to meet Table
Show and mathematic expectaion is sought, dRDAnd dRERepresent respectively and be relayed to the stay of two nights and be relayed to the distance of listener-in, hRE(N × 1 dimension) is for being relayed to
The channel vector of listener-in, nD2And nE2Represent the reception additive white Gaussian noise of the stay of two nights and listener-in respectively, variance is respectivelyWith
Step 403, the stay of two nights and listener-in are respectively adopted connecing for the first time slot described in maximum-ratio combing and second time slot
The collection of letters number, and obtain the received signal to noise ratio of the stay of two nights and the received signal to noise ratio of listener-in respectively.
Specifically, based on step 401 and step 402, the stay of two nights and listener-in are using the reception of two time slots of maximum-ratio combing
Signal, therefore, received signal to noise ratio is expressed as
Step 404, calculates the channel radio based on the received signal to noise ratio for receiving stay of two nights ratio and listener-in of the stay of two nights
The instantaneous safe rate of letter system；Ask mathematic expectaion to obtain average security speed to the instantaneous safe rate.
Specifically, the instantaneous safe rate of wireless communication system of the present invention is CS=max { CD-CE, 0 }, wherein,To CSMathematic expectaion is asked to obtain average security speed：
Step 405, based on the average security speed, obtains the optimal energy collection of maximum average security speed further
Power allocation factor and optimum pre-coding power distribution factor.
Specifically, the method that is looked for one's roots using numerical value is adjusted to the ρ and α, is obtained in preset energy collecting efficiency
Under the conditions of, in information source transmit power, secret signal accounts for general power PSOptimal proportion and relaying carry out when precoding mode is processed protect
Secret letter number accounts for general power PROptimal proportion, and then obtain obtaining the best transmission scheme of maximum average security speed.
Average security speed that the present invention suggested plans is given as shown in Figure 5 with relaying under different relay antenna numbers
The situation of the average signal-to-noise ratio change of each antenna, in figure abscissaRepresent the additive white Gaussian noise of relay reception
The variance of each element in vector,Represent and send signal to noise ratio.Wherein, each channel is rayleigh fading channel, Suo Youjie
The reception noise variance of each time slot of point is all 1, path loss index m=3, energy acquisition efficiency eta=0.4, and work(divides energy to adopt
Power allocation factor ρ=0.6 of collection, man made noise aids in pre-coding power distribution factor α=0.5, in the Europe of each channel is several
Obtain distance：dSD=dSE=1, dSR=dRD=dRE=0.4.As a result show that the carried safe transmission scheme of the present invention can be obtained preferably
Safe transmission performance, meanwhile, by increasing the antenna number that relays, average security speed can be improved further, improve system
Security performance.
Average security speed that the present invention suggested plans is given as shown in Figure 6 in the average of each antenna of different relaying
Divide the situation that the power allocation factor of energy acquisition changes, in figure with work(under signal to noise ratioRepresent and send signal to noise ratio.Wherein,
Each channel is rayleigh fading channel, antenna number N=6 of relaying, and the reception noise variance of all each time slots of node is all 1,
Path loss index m=3, energy acquisition efficiency eta=0.4, man made noise aids in pre-coding power distribution factor α=0.5, each
The Euclidean distance of channel：dSD=dSE=1, dSR=dRD=dRE=0.4.As a result show that average security speed is sent out with information source
Send the increase of power and increase, meanwhile, the timing of other specification one, can obtain optimum work(divide the power distribution of energy acquisition because
Son, has great importance so as to the best transmission scheme to obtaining maximum average security speed.
Average security speed that the present invention suggested plans is given as shown in Figure 7 with artificial under different relay antenna numbers
The situation of noise auxiliary pre-coding power distribution factor change.Wherein, each channel is rayleigh fading channel, the antenna number of relaying
N=6, the reception noise variance of all each time slots of node is all 1, path loss index m=3, and work(divides the power of energy acquisition
Distribution factor ρ=0.6, the Euclidean distance of each channel：dSR=dRD=dRE=0.4, dSD=dSE=1.As a result show to put down
All safe rate increase with the increase of relay antenna number, meanwhile, one timing of other specification, manually making an uproar for optimum can be obtained
Sound aids in pre-coding power distribution factor, has important guiding so as to the best transmission scheme to obtaining maximum average security speed
Meaning.
Presently preferred embodiments of the present invention is these are only, not in order to limit the present invention, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvement that is made etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of energy acquisition relaying safe transmission method of employing man made noise precoding, applies including information source, relaying, letter
In the wireless communication system of place and four nodes of listener-in, it is characterised in that some antennas of the link deployment, remaining node
Single antenna is all configured, and the transmission of the wireless communication system is divided into two time slots and completes, and method includes：
In the first time slot, the secret signal of information source broadcast packet energy content, relaying is carried out to secret signal using maximum-ratio combing
Energy acquisition and reception；While the stay of two nights and listener-in also receive the signal of information source broadcast；
In the second time slot, relaying obtains the kernel vector of its channel condition information for arriving the stay of two nights and channel parameter, and carries out
Man made noise aids in precoding, the signal after the energy amplification forwarding precoding for recycling the first time slot to be collected；The stay of two nights and
Listener-in receives the signal after the precoding of relay forwarding；
The stay of two nights and listener-in are respectively adopted the reception signal of the first time slot described in maximum-ratio combing and second time slot, and difference
Obtain the received signal to noise ratio of the stay of two nights and the received signal to noise ratio of listener-in；
The instantaneous of the wireless communication system is calculated based on the received signal to noise ratio for receiving stay of two nights ratio and listener-in of the stay of two nights
Safe rate；Ask mathematic expectaion to obtain average security speed to the instantaneous safe rate；
Based on the average security speed, the optimal energy collection power allocation factor of maximum average security speed is obtained further
With optimum pre-coding power distribution factor.
2. the energy acquisition of employing man made noise precoding according to claim 1 relays safe transmission method, its feature
It is, the energy that in the first time slot, relaying is collected is represented with following manner：
In first time slot relay reception to signal represented with following manner：
Wherein, 0<η<1, represent the efficiency of energy acquisition；T represents transmission time slot total length, dSRRepresent information source to the distance of relaying,
M represents path-loss factor, PSRepresent information source transmit power；0<ρ<1, represent energy acquisition power allocation factor；hSRFor 1 × N
Dimensional vector, represents information source to trunk channel vector, and wherein N is the antenna number of relaying；||hSR| | representing, 2- norm, x is asked to vector
Represent secret signal, subscriptRepresent and ask conjugate transpose, nRFor 1 × N vector, represent the additive white Gaussian noise of relay reception
Vector.
3. the energy acquisition of employing man made noise precoding according to claim 2 relays safe transmission method, its feature
It is, the information source broadcast singal that in the first time slot, the stay of two nights is received is represented with following manner：
The information source broadcast singal that in first time slot, listener-in receives is represented with following manner：
Wherein, dSDAnd dSERepresent information source to the stay of two nights and information source to the distance of listener-in, h respectivelySDAnd hSERepresent information source to letter respectively
Place and information source are to the channel coefficients of listener-in, nD1And nE1Represent the reception additive white Gaussian noise of the stay of two nights and listener-in, side respectively
Difference is respectivelyWith
4. the energy acquisition of employing man made noise precoding according to claim 3 relays safe transmission method, its feature
It is,
Signal after second time slot precoding is represented with following manner：
xR=w1yR+W2v
Wherein, w1=hRD/||hRD| |, hRDFor N × 1 dimensional vector, represent the channel vector for being relayed to the stay of two nights；W2Tie up for N × (N-1)
Matrix, represents hRDNull space matrix；V is the dimensional vector of (N-1) × 1, represents Human disturbance noise vector, and each of which component is
Independent identically distributed additive white Gaussian noise coefficient, and variance isα represents pre-coding power distribution factor,Represent the total transmit power of relaying.
5. the energy acquisition of employing man made noise precoding according to claim 4 relays safe transmission method, its feature
It is, the signal in the second time slot after the precoding of the relay forwarding that the stay of two nights is received is represented with following manner：
Signal in second time slot after the precoding of the relay forwarding that listener-in receives is represented with following manner：
Wherein, β is the amplification forwarding factor, to meet Expression is asked
Mathematic expectaion, dRDAnd dRERepresent respectively and be relayed to the stay of two nights and be relayed to the distance of listener-in；hREFor N × 1 dimensional vector, in expression
Continue the channel vector of listener-in；nD2And nE2Represent the reception additive white Gaussian noise of the stay of two nights and listener-in respectively, variance is respectively
ForWith
6. the energy acquisition of employing man made noise precoding according to claim 5 relays safe transmission method, its feature
It is, the received signal to noise ratio of the stay of two nights is represented with following manner：
The received signal to noise ratio of the listener-in is represented with following manner：
7. the energy acquisition of employing man made noise precoding according to claim 6 relays safe transmission method, its feature
It is, the instantaneous safe rate is represented with following manner：
CS=max { CD-CE,0}
Wherein,
To CSMathematic expectaion is asked to obtain average security speed：
8. the energy acquisition of employing man made noise precoding according to claim 7 relays safe transmission method, its feature
It is, the method that is looked for one's roots using numerical value is adjusted to the ρ and α, obtains under conditions of preset energy collecting efficiency, information source
In transmit power, secret signal accounts for the P of general powerSOptimal proportion and relaying carry out secret signal when precoding mode is processed and account for always
Power PROptimal proportion, and then obtain obtaining the best transmission scheme of maximum average security speed.
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| CN111786918A (en) * | 2020-06-05 | 2020-10-16 | 中国人民解放军国防科技大学 | Energy acquisition interference unit assisted cooperative non-orthogonal multiple access secure transmission method |
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