CN109862600A - A kind of safe relay transmission system and method - Google Patents
A kind of safe relay transmission system and method Download PDFInfo
- Publication number
- CN109862600A CN109862600A CN201910212146.5A CN201910212146A CN109862600A CN 109862600 A CN109862600 A CN 109862600A CN 201910212146 A CN201910212146 A CN 201910212146A CN 109862600 A CN109862600 A CN 109862600A
- Authority
- CN
- China
- Prior art keywords
- user
- information
- intermediate node
- base station
- sent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention is suitable for mobile communication field, provides safe relay transmission system and method, the safe relay transmission system includes base station, and at least one intermediate node with the base station communication；Wherein, the base station, for the channel information for being sent to legitimate user to be sent to the intermediate node；According to the transmission rate of preset traffic rate thresholding and channel information, determine the intermediate node as relaying；The intermediate node, the channel information for being sent to legitimate user sent for receiving the base station；Processing is decoded to the channel information, obtains decoded information；The relay forwarding that the decoded information is determined by the base station is to legitimate user.It not only can effectively reduce the burden of intermediate node, reach the transmission range of channel information and the target that coverage area is bigger, also, under the premise of ensureing apart from user farther out's quality of security service, maximumlly improve the rate of the safe transmission for the user being closer.
Description
Technical field
The invention belongs to mobile communication field more particularly to a kind of safe relay transmission system and methods.
Background technique
Traditional orthogonal multiple access technique is no longer satisfied the transmission demand of growing mobile subscriber, very
Difficulty realizes very low propagation delay time and higher system transmission capacity while large-scale access.Non-orthogonal multiple connects
The utilization rate of frequency spectrum and the quantity of accessing user can effectively be improved by entering technology, but due to vulnerable to transmitting terminal power and skill
The limitation of art causes information transmission range and range to have very big limitation.Simultaneously because in the actual environment, hardly resulting in letter
The accurate channel information that breath transmission is utilized, therefore guarantee that the safe transmission of multi-user information is current a great problem.
It can be seen that existing non-orthogonal multiple access technology there is the transmission range for being directed to information and coverage area is smaller,
Accurately channel information cannot obtain completely simultaneously, not can guarantee asking for the safe transmission of information apart from transmitting terminal user farther out
Topic.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of safe relay transmission system, it is intended to solve existing non-orthogonal multiple
There is the transmission range for being directed to information in access technology and coverage area is smaller, while accurately channel information cannot obtain completely,
Not the problem of not can guarantee the safe transmission of information apart from transmitting terminal user farther out.
The embodiments of the present invention are implemented as follows, a kind of safe relay transmission system, including base station, and with the base station
At least one intermediate node of communication；
Wherein, the base station, for the channel information for being sent to legitimate user to be sent to the intermediate node；According to
The transmission rate of preset traffic rate thresholding and the channel information determines the intermediate node as relaying；
The intermediate node, the channel information for being sent to legitimate user sent for receiving the base station；To described
Channel information is decoded processing, obtains decoded information；The decoded information is given by the relay forwarding that the base station determines
Legitimate user.
The another object of the embodiment of the present invention is to provide a kind of safe relay transmission method, comprising:
The channel information for being sent to legitimate user is sent to the intermediate node by base station；
According to the transmission rate of preset traffic rate thresholding and the channel information, the intermediate node is determined
As relaying；
By the decoded information by the relay forwarding to legitimate user.
Safe relay transmission system provided in an embodiment of the present invention, by the case where non-orthogonal multiple accesses scene, it is contemplated that
User distance base station farther out the case where, while from multiple intermediate nodes, select a suitable intermediate node as relaying, no
The burden that only can effectively reduce intermediate node, has reached the transmission range of channel information and the target that coverage area is bigger,
Also, under the premise of ensureing apart from user farther out's quality of security service, maximumlly improve the user's being closer
The rate of safe transmission.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of safe relay transmission system provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of base station provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of relaying determination unit provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of another relaying determination unit provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of intermediate node provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of retransmission unit provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of the safe relay transmission system of another kind provided in an embodiment of the present invention；
Fig. 8 is a kind of implementation flow chart of safe relay transmission method provided in an embodiment of the present invention；
Fig. 9 is the implementation flow chart of the safe relay transmission method of another kind provided in an embodiment of the present invention；
Figure 10 is influence schematic diagram of the intermediate node number to system performance；
Figure 11 is jamming power and sends influence schematic diagram of the ratio of power to system secrecy outage probability；
Figure 12 is the theoretical value and Meng Te-Carlow actual value contrast schematic diagram of secrecy outage probability.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The term used in embodiments of the present invention is only to be not intended to be limiting merely for for the purpose of describing particular embodiments
The present invention.Packet is also intended in the "an" and "the" of the embodiment of the present invention and singular used in the attached claims
Most forms are included, unless the context clearly indicates other meaning.It is also understood that term "and/or" used herein is
Refer to and includes that one or more associated any or all of project listed may combine.
It will be appreciated that though various information may be described in embodiments of the present invention using term first, second etc., but
These information should not necessarily be limited by these terms.These terms are only used to for same type of information being distinguished from each other out.
Compared to traditional cordless communication network, non-orthogonal multiple access technology (NOMA) can be passed to multiple users simultaneously
Defeated information has the very high availability of frequency spectrum and throughput of system, while the safety problem of information is also more complicated.In existing
After in the scene that cooperation NOMA primary user is transmitted, the strategy of multi-relay cooperation forwarding is generally used, using beam forming
Technology carries out the forwarding of information, and the characteristics of using multiple intermediate nodes, cooperative base station is transmitted, and setting intermediate node forwards
Beam forming matrix, the interference at eavesdropping user reach maximum, and the interference at legitimate user reaches minimum even force zero, but
Be because NOMA scene user it is very much, after force zero some user at, to other users may very greatly, so to wave beam
The design requirement for forming matrix is very high, has ignored the effective rate of utilization and cooperation efficiency of multiple relay nodes in this way.
The base station NOMA needs to multiple users while sending information, and in real life, the quantity of NOMA user is very more,
The power of base station is not able to satisfy multi-user and at a distance transmission, and the quality and distance for transmitting signal all have received very big limit
System, causes information transmission range and range to have very big limitation.Simultaneously because in the actual environment, hardly resulting in information transmission
The accurate channel information of the channel utilized, therefore guarantee that the safe transmission of multi-user information is a great problem.
Safe relay transmission system provided in an embodiment of the present invention, by the case where non-orthogonal multiple accesses scene, it is contemplated that
User distance base station farther out the case where, while from multiple intermediate nodes, select a suitable intermediate node as relaying,
It ensures under the premise of user farther out's quality of security service, maximumlly improves the safe transmission for the user being closer
Rate, can effectively reduce the burden of intermediate node, eliminate limitation of the Beamforming technology to grid, make transmission more
Add flexibly.
The technical means and efficacy taken in order to which the present invention is further explained for the predetermined goal of the invention of realization, below in conjunction with
Attached drawing and preferred embodiment, to specific embodiment, structure, feature and its effect according to the present invention, detailed description are as follows.
Fig. 1 shows a kind of structural representation of safe relay transmission system provided in an embodiment of the present invention, for the ease of saying
It is bright, part related to the embodiment of the present invention is only shown, details are as follows:
In embodiments of the present invention, the safe relay transmission system, including base station 101, and with the base station communication
At least one intermediate node 102.
Wherein, the base station 101, for the channel information for being sent to legitimate user to be sent to the intermediate node；
According to the transmission rate of preset traffic rate thresholding and the channel information, determine in the intermediate node conduct
After.
In embodiments of the present invention, the base station is public mobile communication base station, is a kind of form of radio station,
Refer in certain area of radio coverage, by carrying out information biography between mobile switching center, with mobile telephone terminal
The transceiving letter radio station passed, under normal circumstances, whole system transmission process is divided into two time slots, wherein the first time slot
Communication process is to distribute information to different user using power domain multiplexing technology by base station, and mixed information is transmitted to multiple
Decoded information is transmitted to legitimate user in a manner of forwarding intermediate node using decoding by intermediate node；Second time slot leads to
Letter process is to select an intermediate node, by decoded information, to use as relaying from the intermediate node that can be successfully decoded
The mode of power distribution identical with base station continues to be transmitted to legitimate user.
In embodiments of the present invention, the determination principle of relaying is: the channel state information due to not knowing eavesdropping user,
It therefore can only be an estimated value for the channel state information of each intermediate node to eavesdropping user, therefore in actual scene
In, the optimality in view of entire Transmission system performance is needed, i.e., when the channel for all intermediate nodes to eavesdropping user
When state is all estimated value, the nearly maximum intermediate node of subscriber channel mould square is chosen, can utmostly realize eavesdropping chain
The difference on road and legal link guarantees the security performance of system in a higher range.
Specifically, the channel status in source node to destination node is more excellent than the channel status of source node to eavesdropping user
When, there are a traffic rate thresholding Rth, as the transmission rate C of primary linkdWith the transmission rate C of eavesdropping linkeDifference CsGreatly
When this traffic rate, it is ensured that eavesdropping user guarantees the reliable transmission of primary user while can not eavesdropping information.
CS=Cd-Ce> Rth
All CeWhen being all estimated value, C is maximizeddValue, so that it may the C of realizationsIt maximizes.
The intermediate node 102, the channel information for being sent to legitimate user sent for receiving the base station；To institute
It states channel information and is decoded processing, obtain decoded information；The decoded information is passed through into the relay forwarding that the base station determines
To legitimate user.
In embodiments of the present invention, in the first slot, base station sends information to middle node by the way of power distribution
Point, therefore the information received at all intermediate nodes can indicate are as follows:
Wherein, the power of remote subscriber's information distribution is α1, the power of short distance user information distribution is α2, wherein α1
> α2, α1+α2=1, the transmission power of base station is Ps, x1、x2Respectively indicate the information that base station is sent to legitimate user, hi,jIt represents
Channel gain, wherein i ∈ (s, r, J), j ∈ (r, D1,D2, e), s indicates base station, and r indicates that intermediate node, J indicate interference, D2Table
Show nearly user, D1Indicate that remote user, e indicate eavesdropping user, i indicates that transmitting terminal, j indicate receiving end；niIndicate channel at node
It is 0 that white Gaussian noise, which is all obedience mean value, and variance isMultiple Gauss distribution variable.
In the second time slot, relaying recodes decoded signal, is sent using power distribution mode identical with base station
To destination node, meanwhile, therefore the eavesdropping by sending artificial noise jamming eavesdropping user receives at NOMA user
Information can indicate are as follows:
Wherein, xJIndicate the man made noise of interfering nodes, nDFor intermediate node to the white Gaussian noise of legitimate user's channel.
Safe relay transmission system provided in an embodiment of the present invention, by the case where non-orthogonal multiple accesses scene, it is contemplated that
User distance base station farther out the case where, while from multiple intermediate nodes, select a suitable intermediate node as relaying,
It ensures under the premise of user farther out's quality of security service, maximumlly improves the safe transmission for the user being closer
Rate, can effectively reduce the burden of intermediate node, solve existing non-orthogonal multiple access technology and exist for information
Transmission range and coverage area it is smaller, accurate channel information cannot obtain completely, and apart from transmitting terminal, user farther out can not
Guarantee the safe transmission problem of information.
Fig. 2 is the structural schematic diagram of base station provided in an embodiment of the present invention, for ease of description, is only shown and present invention reality
The relevant part of example is applied, details are as follows:
In embodiments of the present invention, the base station includes transmission unit 201 and relaying determination unit 202.
Transmission unit 201, for the channel information for being sent to legitimate user to be sent to the intermediate node.
In embodiments of the present invention, the channel information for being sent to legitimate user is sent to the intermediate node is to use
The mode of power distribution.
Determination unit 202 is relayed, for the transmission rate according to preset traffic rate thresholding and the channel information,
Determine the intermediate node as relaying.
In embodiments of the present invention, the determination principle of relaying is: the channel state information due to not knowing eavesdropping user,
It therefore can only be an estimated value for the channel state information of each intermediate node to eavesdropping user, therefore in actual scene
In, the optimality in view of entire Transmission system performance is needed, i.e., when the channel for all intermediate nodes to eavesdropping user
When state is all estimated value, the nearly maximum intermediate node of subscriber channel mould square is chosen, can utmostly realize eavesdropping chain
The difference on road and legal link guarantees the security performance of system in a higher range.
Specifically, the channel status in source node to destination node is more excellent than the channel status of source node to eavesdropping user
When, there are a traffic rate thresholding Rth, as the transmission rate C of primary linkdWith the transmission rate C of eavesdropping linkeDifference CsGreatly
When this traffic rate, it is ensured that eavesdropping user guarantees the reliable transmission of primary user while can not eavesdropping information.
CS=Cd-Ce> Rth
All CeWhen being all estimated value, C is maximizeddValue, so that it may the C of realizationsIt maximizes.
Fig. 3 is that the structural representation of relaying determination unit provided in an embodiment of the present invention is only shown and this for ease of description
The relevant part of inventive embodiments, details are as follows:
In embodiments of the present invention, the relaying determination unit includes data obtaining module 301 and the first relaying confirmation
Module 302.
Data obtaining module 301, the difference for obtaining the transmission rate of primary link and the transmission rate of eavesdropping link are big
In the information of preset traffic rate thresholding.
First relaying confirmation module 302, for according to the transmission rate of the primary link and the transmission rate of eavesdropping link
Difference be greater than the information of preset traffic rate thresholding, determine the intermediate node as relaying.
In embodiments of the present invention, the determination principle of relaying is: the channel state information due to not knowing eavesdropping user,
It therefore can only be an estimated value for the channel state information of each intermediate node to eavesdropping user, therefore in actual scene
In, the optimality in view of entire Transmission system performance is needed, i.e., when the channel for all intermediate nodes to eavesdropping user
When state is all estimated value, the nearly maximum intermediate node of subscriber channel mould square is chosen, can utmostly realize eavesdropping chain
The difference on road and legal link guarantees the security performance of system in a higher range.
Specifically, the channel status in source node to destination node is more excellent than the channel status of source node to eavesdropping user
When, there are a traffic rate thresholding Rth, as the transmission rate C of primary linkdWith the transmission rate C of eavesdropping linkeDifference CsGreatly
When this traffic rate, it is ensured that eavesdropping user guarantees the reliable transmission of primary user while can not eavesdropping information.
CS=Cd-Ce> Rth
All CeWhen being all estimated value, C is maximizeddValue, so that it may the C of realizationsIt maximizes.
Fig. 4 is that the structural representation of another relaying determination unit provided in an embodiment of the present invention is only shown for ease of description
Part related to the embodiment of the present invention out, details are as follows:
In embodiments of the present invention, the relaying determination unit includes that channel gain obtains module 401 and the second relaying
Confirmation module 402.
Channel gain obtains module 401, for the transmission according to preset traffic rate thresholding and the channel information
Rate is obtained apart from short distance subscriber channel gain.
Second relaying confirmation module 402, being used for will be apart from the maximum intermediate node conduct of short distance subscriber channel yield value
Relaying.
In embodiments of the present invention, the determination principle of relaying is: the channel state information due to not knowing eavesdropping user,
It therefore can only be an estimated value for the channel state information of each intermediate node to eavesdropping user, therefore in actual scene
In, the optimality in view of entire Transmission system performance is needed, i.e., when the channel for all intermediate nodes to eavesdropping user
When state is all estimated value, the nearly maximum intermediate node of subscriber channel mould square is chosen, can utmostly realize eavesdropping chain
The difference on road and legal link guarantees the security performance of system in a higher range.
Fig. 5 is the structural representation of intermediate node provided in an embodiment of the present invention, for ease of description, is only shown and the present invention
The relevant part of embodiment, details are as follows:
In embodiments of the present invention, the intermediate node includes receiving unit 501, decoding unit 502 and retransmission unit
503。
Receiving unit 501, the channel information for being sent to legitimate user sent for receiving the base station.
Decoding unit 502 obtains decoded information for being decoded processing to the channel information.
In embodiments of the present invention, in the first slot, base station sends information to middle node by the way of power distribution
Point, therefore the information received at all intermediate nodes can indicate are as follows:
Wherein, the power of remote subscriber's information distribution is α1, the power of short distance user information distribution is α2, wherein α1
> α2, α1+α2=1, the transmission power of base station is Ps, x1、x2Respectively indicate the information that base station is sent to legitimate user, hi,jIt represents
Channel gain, wherein i ∈ (s, r, J), j ∈ (r, D1,D2, e), s indicates base station, and r indicates that intermediate node, J indicate interference, D2Table
Show nearly user, D1Indicate that remote user, e indicate eavesdropping user, i indicates that transmitting terminal, j indicate receiving end；niIndicate channel at node
It is 0 that white Gaussian noise, which is all obedience mean value, and variance isMultiple Gauss distribution variable.
Retransmission unit 503, the relay forwarding for determining the decoded information by the base station is to legitimate user.
In embodiments of the present invention, in the second time slot, relaying recodes decoded signal, using identical with base station
Power distribution mode is sent to destination node, meanwhile, the eavesdropping of eavesdropping user is interfered by man made noise, therefore, is used in NOMA
The information received at family can indicate are as follows:
Wherein, xJIndicate the man made noise of interfering nodes, nDFor intermediate node to the white Gaussian noise of legitimate user's channel,
The power of relay forwarding is Pr, the transmission power of interfering nodes is Pz。
Fig. 6 is the structural representation of retransmission unit provided in an embodiment of the present invention, for ease of description, is only shown and the present invention
The relevant part of embodiment, details are as follows:
In embodiments of the present invention, the retransmission unit includes nearly user's sending module 601 and remote user's sending module
602。
In embodiments of the present invention, the legitimate user is divided into nearly user and remote uses according at a distance from intermediate node
Intermediate node is considered as an entirety, therefore this criteria for classifying here by family are as follows: the whole intermediate node of legitimate user's distance away from
From it is farther away be short distance user, being closer is short distance user.
Nearly user's sending module 601, it is true by the base station for the decoded information to be based on self-interference technology for eliminating
Fixed relay forwarding gives short distance user, so that the short distance user obtains itself corresponding informance.
In embodiments of the present invention, (SIC) technology is eliminated using self-interference at short distance user, first decodes the letter of remote user
Breath, after elimination, decoding obtains the information of itself.
Remote user's sending module 602, the relay forwarding for determining the decoded information by the base station is to long distance
From user, so that the remote subscriber obtains itself corresponding informance.
In embodiments of the present invention, after remote subscriber receives itself signal, the information needed is decoded.
Fig. 7 shows the structural representation of the safe relay transmission system of another kind provided in an embodiment of the present invention, for the ease of
Illustrate, only show part related to the embodiment of the present invention, details are as follows:
The embodiment of the present invention is similar with embodiment one, the difference is that: the safe relay transmission system further includes doing
Disturb node 701.
The interfering nodes 701, for turning the decoded information by the relaying that the base station determines when intermediate node
When issuing legitimate user, eavesdropping user is interfered.
In embodiments of the present invention, interfering nodes are only arranged one, because multiple interfering nodes may cause between node
Interfere with each other, the performance of interference declines instead.Due to the presence of interference, the letter of the relay forwarding received at eavesdropping user
Breath are as follows:
Wherein, the power of remote subscriber's information distribution is α1, the power of short distance user information distribution is α2, wherein α1
> α2, α1+α2=1, the transmission power of base station is Ps, the power of relay forwarding is Pr, the transmission power of interfering nodes is Pz；x1、x2
Respectively indicate the information that base station is sent to legitimate user, hi,jRepresent channel gain, wherein i ∈ (s, r, J), j ∈ (r, D1,D2,
E), s indicates base station, and r indicates that intermediate node, J indicate interference, D2Indicate nearly user, D1Indicate that remote user, e indicate eavesdropping user, i
Indicate that transmitting terminal, j indicate receiving end；niIt is 0 that the white Gaussian noise of channel at expression node, which is all obedience mean value, and variance is
Multiple Gauss distribution variable.
Traditional interfering nodes base station individually sends the independent information of legitimate user, can be by node-node transmission mode
The force zero of interference is realized in setting at legitimate user, but in non-orthogonal multiple access technology scene, due to the increasing of user
More, the information of user mixes transmission simultaneously, the force zero at some user, may other users interference it is stronger instead, therefore
Need to consider all there is the case where interference；And since non-orthogonal multiple access technology allows more user access networks,
Disturbance state at different users is different, and the embodiment of the present invention is according to eavesdropping user apart from the remote of legitimate user's distance
Closely, all it is rayleigh fading channel according to the channel of hypothesis, obeys with distribution, considers that user is divided into different shapes by the distance of distance
State.
Safe relay transmission system provided in an embodiment of the present invention, by the way that interfering nodes and relay selection are combined,
The eavesdropping for weakening eavesdropping user while improving legitimate user's information transmission quality, that is, pass through the setting of interfering nodes, Ke Yibao
Demonstrate,prove channel capacity of legitimate user's channel capacity always greater than eavesdropping user.
Fig. 8 shows a kind of implementation process of safe relay transmission method provided in an embodiment of the present invention, for the ease of saying
It is bright, part related to the embodiment of the present invention is only shown, details are as follows:
In step S801, the channel information for being sent to legitimate user is sent to by the intermediate node by base station.
In embodiments of the present invention, the base station is public mobile communication base station, is a kind of form of radio station,
Refer in certain area of radio coverage, by carrying out information biography between mobile switching center, with mobile telephone terminal
The transceiving letter radio station passed, under normal circumstances, whole system transmission process is divided into two time slots, wherein the first time slot
Communication process is to distribute information to different user using power domain multiplexing technology by base station, and mixed information is transmitted to multiple
Decoded information is transmitted to legitimate user in a manner of forwarding intermediate node using decoding by intermediate node；Second time slot leads to
Letter process is to select an intermediate node, by decoded information, to use as relaying from the intermediate node that can be successfully decoded
The mode of power distribution identical with base station continues to be transmitted to legitimate user.
In step S802, according to the transmission rate of preset traffic rate thresholding and the channel information, one is determined
A intermediate node is as relaying.
In embodiments of the present invention, the determination principle of relaying is: the channel state information due to not knowing eavesdropping user,
It therefore can only be an estimated value for the channel state information of each intermediate node to eavesdropping user, therefore in actual scene
In, the optimality in view of entire Transmission system performance is needed, i.e., when the channel for all intermediate nodes to eavesdropping user
When state is all estimated value, the nearly maximum intermediate node of subscriber channel mould square is chosen, can utmostly realize eavesdropping chain
The difference on road and legal link guarantees the security performance of system in a higher range.
Specifically, the channel status in source node to destination node is more excellent than the channel status of source node to eavesdropping user
When, there are a traffic rate thresholding Rth, as the transmission rate C of primary linkdWith the transmission rate C of eavesdropping linkeDifference CsGreatly
When this traffic rate, it is ensured that eavesdropping user guarantees the reliable transmission of primary user while can not eavesdropping information.
CS=Cd-Ce> Rth
All CeWhen being all estimated value, C is maximizeddValue, so that it may the C of realizationsIt maximizes.
In step S803, the relay forwarding that the decoded information is determined by the base station is to legitimate user.
Safe relay transmission method provided in an embodiment of the present invention, by the case where non-orthogonal multiple accesses scene, it is contemplated that
User distance base station farther out the case where, while from multiple intermediate nodes, select a suitable intermediate node as relaying,
It ensures under the premise of user farther out's quality of security service, maximumlly improves the safe transmission for the user being closer
Rate, can effectively reduce the burden of intermediate node, solve existing non-orthogonal multiple access technology and exist for information
Transmission range and coverage area it is smaller, accurate channel information cannot obtain completely, and apart from transmitting terminal, user farther out can not
Guarantee the safe transmission problem of information.
Fig. 9 shows the implementation process of the safe relay transmission method of another kind provided in an embodiment of the present invention, for the ease of
Illustrate, only show part related to the embodiment of the present invention, details are as follows:
Its is similar to the above embodiments, the difference is that, further includes:
It is right when the decoded information is passed through the relay forwarding to legitimate user by intermediate node in step S901
Eavesdropping user is interfered.
In embodiments of the present invention, due to the presence of interference, the information of the relay forwarding received at eavesdropping user are as follows:
Wherein, the power of remote subscriber's information distribution is α1, the power of short distance user information distribution is α2, wherein α1
> α2, α1+α2=1, the transmission power of base station is Ps, the power of relay forwarding is Pr, the transmission power of interfering nodes is Pz；x1、x2
Respectively indicate the information that base station is sent to legitimate user, hi,jRepresent channel gain, wherein i ∈ (s, r, J), j ∈ (r, D1,D2,
E), s indicates base station, and r indicates that intermediate node, J indicate interference, D2Indicate nearly user, D1Indicate that remote user, e indicate eavesdropping user, i
Indicate that transmitting terminal, j indicate receiving end；niIt is 0 that the white Gaussian noise of channel at expression node, which is all obedience mean value, and variance is
Multiple Gauss distribution variable.
Safe relay transmission method provided in an embodiment of the present invention, by mutually tying perturbation technique with relay selection technology
It closes, weakens the eavesdropping of eavesdropping user while improving legitimate user's information transmission quality, it is ensured that legitimate user's channel holds
Measure the channel capacity always greater than eavesdropping user.
Performance verification is carried out to safe relay transmission system provided in an embodiment of the present invention below:
Assuming that the embodiment of the present invention has K intermediate node, in decoding forwarding state, all nodes are all single antenna for work
, interfering nodes will not generate interference to the information of base station to intermediate node, and all channels are all rayleigh fading channels, not know
The power of the channel state information of road eavesdropping user, remote user information distribution is α1, the power of nearly user information distribution is α2,
Middle α1> α2, α1+α2=1, the transmission power of base station is Ps, the power of relay forwarding is Pr, the transmission power of interfering nodes is Pz；
x1、x2Respectively indicate the information that base station is sent to legitimate user, hi,jChannel gain is represented, wherein i ∈ (s, r, J), j ∈ (r, D1,
D2, e), s indicates base station, and r indicates that intermediate node, J indicate interference, D2Indicate nearly user, D1Indicate that remote user, e indicate that eavesdropping is used
Family, i indicate that transmitting terminal, j indicate receiving end；niIndicate the white Gaussian noise of channel at node., all be obey mean value be 0, variance
ForMultiple Gauss distribution variable.The present invention is for signal x1、x2The safe transmission rate threshold of setting is respectively R1、R2(this
The safe transmission thresholding assumed that, wherein Cth1=2^ (2*R1), Cth1=2^ (2*R2))。
It is fixed in the channel for interfering with destination node, it is not known that the instantaneous channel state information of tapping channel only knows system
When counting channel state information, it is exactly to maximize that the secrecy rate for maximizing nearly user, which is converted to mathematical analysis, | hr,D2|2, therefore select
Select apart from the best intermediate node max of nearly subscriber channel gain (| hr,D2|2) relaying is used as to carry out forwarding information, it thus can be most
Change the secrecy rate of nearly user greatly.
At intermediate node, needs to be successfully decoded the information of remote user and the information of nearly user respectively, just can guarantee in this way
Therefore successful forwarding information, the not omission of information can be decomposed into the new probability formula that two independences can multiply are as follows:
Pth2=P (1+ α2ρ|hs,r|2> Cth2)
Wherein, Pth1、Pth2, P, ρ be respectively remote user information the probability that is successfully decoded, being successfully decoded for nearly user information be general
Rate, what P was represented is exactly the symbol of probability, and ρ is the ratio for sending power and white Gaussian noise.
Remote user can safe transmission, while maximizing the mathematic(al) representation of the safe transmission rate probability of nearly user, can
To obtain:
Wherein, P1、P2, P, ρ be respectively remote user information safe transmission probability, the safe transmission of nearly user information it is general
Rate, what P was represented is exactly the symbol of probability, and ρ is the ratio for sending power and white Gaussian noise.ρzFor jamming power and Gauss white noise
The ratio of sound.
Assuming that there is K intermediate node, an intermediate node can be successfully decoded information and guarantee the safe transmission of system
Probability is Pr1*Pth, it is assumed that there is r intermediate node that can guarantee to be successfully decoded in the first time slot while in second time slot
Ensure information safety transmission, therefore the secrecy outage probability (SOP) of system can indicate are as follows:
The transmission process of safe relay transmission system provided by the invention is divided into two time slots, and communication process is as follows:
First time slot, information is distributed to different users using power domain multiplexing technology in base station, and mixed information is forwarded
To multiple intermediate nodes, interfering nodes will not generate interference to intermediate node at this time, by the way of intermediate node is forwarded using decoding,
Decoded information simultaneously prepares to be transmitted to destination node.
B) the second time slot selects an intermediate node will decoding as relaying from the intermediate node that can be successfully decoded
Information, using and the identical power distribution in base station by the way of continue to be transmitted to destination node, while eavesdropping user eavesdropping relaying
The information of forwarding, interfering nodes transmitted noise interfere eavesdropping user, after remote user receives the signal of itself, decode
To the information of needs, nearly user after decoding the signal of remote user and deletion, decodes itself in such a way that self-interference eliminates SIC
Information.It is respectively R that safe transmission thresholding, which is arranged,1、R2, it is contemplated that the non-perfect channel state information of eavesdropping user, therefore protecting
Under the premise of the safe transmission for demonstrate,proving remote user, an intermediate node best with nearly User Status is selected to carry out signal as relaying
Forwarding.
Wherein, in the first slot, base station sends information to intermediate node by the way of power distribution, thus it is all in
The information received at intermediate node can indicate are as follows:
Relaying receives information by the way of decoding forwarding, the base station information received is decoded forwarding, in centre
At node, using self-interference technology for eliminating decoded information, therefore, for signal x1Signal to Interference plus Noise Ratio and x2Signal-to-noise ratio (SINR)
It is as follows respectively:
In the second time slot, relaying recodes decoded signal, is sent using power distribution mode identical with base station
To destination node, meanwhile, interfering nodes send the eavesdropping of artificial noise jamming eavesdropping user, therefore, receive at NOMA user
To information can indicate are as follows:
Self-interference technology for eliminating is used at nearly user, first decodes the information of remote user, after elimination, decoding obtains the letter of itself
Breath, therefore signal x2Signal to Interference plus Noise Ratio are as follows:
Likewise, due to the presence of interference, the information of the relay forwarding received at eavesdropping user are as follows:
Present invention assumes that eavesdropping user has better decoding capability, therefore, for signal x1、x2, at eavesdropping user
SINR expression formula is respectively as follows:
The purpose of Signal to Interference plus Noise Ratio and signal-to-noise ratio is that the transmission capacity of system, legitimate user and eavesdropping use can be calculated
The ratio of the signal-to-noise ratio at family is exactly the transmission capacity of system.Integrating to it can be in the hope of the secrecy outage probability of system.
According to intermediate node number in above-mentioned secrecy outage probability (SOP) expression formula research safety relay transmission system to being
The influence for performance of uniting, the results are shown in Figure 10, it can be seen that with the increase of intermediate node number, system performance is to be continuously improved
, but be also required to consider that node increases bring resource consumption simultaneously, therefore select suitable intermediate node number can be more
The security performance for the raising system changed greatly.In addition, due to present invention assumes that the base station NOMA does not have legal link, institute to destination node
With when intermediate node number is 0, system is to interrupt, when intermediate node number is 1, at this moment, whole system becomes biography
The safety of physical layer relay forwarding system of system does not need to carry out relay selection, only one intermediate node is in forwarding legal signal.
Invention further contemplates under fixed higher transmission power, jamming power and the ratio pair for sending power
The influence of system secrecy outage probability, as a result as shown in figure 11, it can be seen that with the increase of ratio, system secrecy outage probability
First quickly reduce, then slowly increase, at δ ≈ 0.225, obtains minimum value.I.e. with the increase of jamming power, system
Security performance first improves, and is slowly deteriorated, therefore selects suitable jamming power, can effectively improve the performance of system.
Meanwhile for the analysis to system robustness, the present invention further analyzes the probability of non-zero secrecy achievable rate
(PNASR)。
Calculated by above-mentioned formula it is available, in this case, it is possible to the safe transmission rate reached greater than zero it is general
Rate is constant 1 always, this is illustrated, as long as there is the presence of man made noise, so that it may guarantee in the NOMA scheme, legitimate user's
Channel capacity of the channel capacity always greater than eavesdropping user, that is to say, that the channel of legitimate user can always be better than eavesdropping user
Channel, whole system has good robustness.
The embodiment of the present invention considers the premise that channel information in actual environment is difficult accurately to obtain, it is contemplated that non-perfect letter
The influence of the premise of road information and the eavesdropping user of passiveness to system, increases extra interference node, transmitted noise is to eavesdropping
User interferes, at the same can be eliminated at destination node from traditional mobile network's interference it is different, due to non-orthogonal multiple
Access technology allows more user access networks, therefore the disturbance state at different users is different, and the present invention is real
The characteristics of example has made a concrete analysis of interference is applied, a suitable intermediate node forwarding information is selected from multiple intermediate nodes, is ensured
Distance under the premise of the quality of security service of user, maximizes the speed for improving the safe transmission for the user being closer farther out
Rate.
To sum up, compared with existing relay cooperative and beamforming schemes, the embodiment of the present invention provides safe relay transmission
The resource utilization of system is lower, selects one to be transmitted from multiple intermediate nodes as suitable relaying, can be effective
The remaining intermediate node of release resource, while compared with single relay forwarding, secrecy outage probability of the invention is obviously improved,
When intermediate node number is 10, the secrecy interruption performance of system improves about 21%.As long as in addition, there is depositing for interfering nodes
, so that it may guarantee channel capacity of legitimate user's channel capacity always greater than eavesdropping user, that is to say, that the letter of legitimate user
Road is always better than the channel of eavesdropping user, therefore the suitable transmission available higher safe transmission probability of thresholding is arranged.
The following are the simulation examples of safe relay transmission system provided in an embodiment of the present invention:
Using Meng Te-Carlow experiment, actual NOMA scene is emulated, repeats experiment 10W times, it is available to fail
The number of Successful transmissions, this quantity are exactly actual secrecy outage probability divided by total degree.Using Matlab, theory is calculated
Value and the comparison of Meng Te-Carlow actual value.
As a result as shown in figure 12, a1, a2 are far and near user power distribution coefficient, and R1, R2 are the safe transmission thresholding of system,
Under the setting of different transimission power distribution coefficient and interference threshold, in high s/n ratio, theoretical value and simulation value are almost weighed
It closes, illustrates under high s/n ratio, the safe relay transmission system that the present invention puts forward, system performance theory analysis and reality
Environment is very close, can be effectively applied in true environment, while demonstrating above-mentioned to safe relay transmission system
The correctness of performance verification theory analysis can replace actual value to be analyzed, keep away in subsequent performance evaluation with theoretical value
Exempt from largely repeat testing.
Although should be understood that various embodiments of the present invention flow chart in each step according to arrow instruction successively
It has been shown that, but these steps are not that the inevitable sequence according to arrow instruction successively executes.Unless expressly state otherwise herein,
There is no stringent sequences to limit for the execution of these steps, these steps can execute in other order.Moreover, each embodiment
In at least part step may include that perhaps these sub-steps of multiple stages or stage are not necessarily multiple sub-steps
Completion is executed in synchronization, but can be executed at different times, the execution in these sub-steps or stage sequence is not yet
Necessarily successively carry out, but can be at least part of the sub-step or stage of other steps or other steps in turn
Or it alternately executes.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of safe relay transmission system, which is characterized in that including base station, and with the base station communication at least one in
Intermediate node；
Wherein, the base station, for the channel information for being sent to legitimate user to be sent to the intermediate node；According to default
Traffic rate thresholding and the channel information transmission rate, determine the intermediate node as relaying；
The intermediate node, the channel information for being sent to legitimate user sent for receiving the base station；To the channel
Information is decoded processing, obtains decoded information；The relay forwarding that the decoded information is determined by the base station is to legal
User.
2. safe relay transmission system according to claim 1, which is characterized in that the base station specifically includes:
Transmission unit, for the channel information for being sent to legitimate user to be sent to the intermediate node；And
It relays determination unit and determines one for the transmission rate according to preset traffic rate thresholding and the channel information
A intermediate node is as relaying.
3. safe relay transmission system according to claim 2, which is characterized in that the relaying determination unit is specifically wrapped
It includes:
Data obtaining module, the difference for obtaining the transmission rate of primary link and the transmission rate of eavesdropping link are greater than preset
The information of traffic rate thresholding；And
First relaying confirmation module, the difference for transmission rate and the transmission rate of eavesdropping link according to the primary link are big
In the information of preset traffic rate thresholding, determine the intermediate node as relaying.
4. safe relay transmission system according to claim 2, which is characterized in that the relaying determination unit is specifically wrapped
It includes:
Channel gain obtains module and obtains for the transmission rate according to preset traffic rate thresholding and the channel information
It takes apart from short distance subscriber channel gain；And
Second relaying confirmation module, for relaying will to be used as apart from the maximum intermediate node of short distance subscriber channel yield value.
5. safe relay transmission system according to claim 1, which is characterized in that the intermediate node specifically includes:
Receiving unit, the channel information for being sent to legitimate user sent for receiving the base station；
Decoding unit obtains decoded information for being decoded processing to the channel information；And
Retransmission unit, the relay forwarding for determining the decoded information by the base station is to legitimate user.
6. safe relay transmission system according to claim 3, which is characterized in that the retransmission unit specifically includes:
Nearly user's sending module, for the decoded information to be based on self-interference technology for eliminating, by the determination of the base station
After being transmitted to short distance user, so that the short distance user obtains itself corresponding informance；And
Remote user's sending module, relay forwarding for determining the decoded information by the base station to remote subscriber,
So that the remote subscriber obtains itself corresponding informance.
7. safe relay transmission system according to claim 1, which is characterized in that the system also includes interfering nodes；
The interfering nodes, the relay forwarding for determining the decoded information by the base station when intermediate node is to legal
When user, eavesdropping user is interfered.
8. a kind of safe relay transmission method characterized by comprising
The channel information for being sent to legitimate user is sent to the intermediate node by base station；
According to the transmission rate of preset traffic rate thresholding and the channel information, the intermediate node conduct is determined
Relaying；
By the decoded information by the relay forwarding to legitimate user.
9. safe relay transmission method according to claim 1, which is characterized in that the method also includes:
When the decoded information is passed through the relay forwarding to legitimate user by intermediate node, eavesdropping user is interfered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910212146.5A CN109862600A (en) | 2019-03-20 | 2019-03-20 | A kind of safe relay transmission system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910212146.5A CN109862600A (en) | 2019-03-20 | 2019-03-20 | A kind of safe relay transmission system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109862600A true CN109862600A (en) | 2019-06-07 |
Family
ID=66901254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910212146.5A Pending CN109862600A (en) | 2019-03-20 | 2019-03-20 | A kind of safe relay transmission system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109862600A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111510987A (en) * | 2020-03-13 | 2020-08-07 | 西安电子科技大学 | Relay selection method based on safety cooperation NOMA network |
-
2019
- 2019-03-20 CN CN201910212146.5A patent/CN109862600A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111510987A (en) * | 2020-03-13 | 2020-08-07 | 西安电子科技大学 | Relay selection method based on safety cooperation NOMA network |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Jorswieck et al. | Broadcasting into the uncertainty: Authentication and confidentiality by physical-layer processing | |
| Cumanan et al. | Physical layer security jamming: Theoretical limits and practical designs in wireless networks | |
| Yang et al. | Covert transmission and secrecy analysis of RS-RIS-NOMA-aided 6G wireless communication systems | |
| Guo et al. | Outage performance of relay-assisted cognitive-radio system under spectrum-sharing constraints | |
| Yang et al. | Efficient full-duplex relaying with joint antenna-relay selection and self-interference suppression | |
| KR101124720B1 (en) | Techniques for receiver beamforming and yielding-threshold adjustments in peer-to-peer networks | |
| JP2011193466A (en) | Supplemental node transmission assistance in wireless communication network | |
| Liao et al. | On security-delay trade-off in two-hop wireless networks with buffer-aided relay selection | |
| Wang et al. | Outage probability of full-duplex AF relaying with processing delay and residual self-interference | |
| Zhang et al. | Secrecy outage analysis with Kth best relay selection in dual-hop inter-vehicle communication systems | |
| El-Keyi et al. | MIMO VANETs: Research challenges and opportunities | |
| Yu et al. | Jammer-aided secure communications for cooperative NOMA systems | |
| Qiao et al. | Buffer-aided relay systems under delay constraints: Potentials and challenges | |
| Nomikos et al. | When buffer-aided relaying meets full duplex and NOMA | |
| Wan et al. | Buffer-aided two-hop secure communications with power control and link selection | |
| CN105813081B (en) | The method that selective enhancement recognizes the relay node of junction network security performance | |
| Lakshmanan et al. | Securing wireless data networks against eavesdropping using smart antennas | |
| Yadav et al. | A review of transmission rate over wireless fading channels: Classifications, applications, and challenges | |
| Altubaishi et al. | Performance analysis of spectrally efficient amplify‐and‐forward opportunistic relaying scheme for adaptive cooperative wireless systems | |
| Ju et al. | Energy-Efficient Cooperative Secure Communications in mmWave Vehicular Networks Using Deep Recurrent Reinforcement Learning | |
| Xu et al. | AN-aided secure beamforming design for correlated MISO wiretap channels | |
| Awad et al. | Secrecy enhancement of cooperative NOMA networks with two-way untrusted relaying | |
| CN109862600A (en) | A kind of safe relay transmission system and method | |
| Levorato et al. | Physical layer approximations for cross–layer performance analysis in MIMO-BLAST ad hoc networks | |
| Benedict et al. | Secrecy analysis of a cognitive radio network with an energy harvesting AF relay |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190607 |