CN109525984A - A method of improving the safe rate of insincere relaying portable communications system - Google Patents
A method of improving the safe rate of insincere relaying portable communications system Download PDFInfo
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- CN109525984A CN109525984A CN201811203398.3A CN201811203398A CN109525984A CN 109525984 A CN109525984 A CN 109525984A CN 201811203398 A CN201811203398 A CN 201811203398A CN 109525984 A CN109525984 A CN 109525984A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
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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
- H04W40/04—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources
- H04W40/10—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources based on available power or energy
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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
Abstract
The invention belongs to field of information security technology, disclose a kind of method of safe rate for improving insincere relaying portable communications system, comprising: the model of the communication process of the bilateral relay network of one double bounce of building；The energy that the signal and own for calculating the first time slot relay forwarding are collected；Calculate the signal and their signal-to-noise ratio and channel capacity that two sources receive in the second time slot；The obtained instantaneous signal-to-noise ratio in two sources and corresponding channel capacity when calculating eavesdropping relaying；Calculate two sources to relaying channel safe rate；Safe rate is optimized, two optimal transmission powers in source of A and B are found out and relays the proportionality coefficient ρ of themselves capture energy.The present invention is distributed better than constant power, and safe rate reliability can be made to be optimal, and is suitable for insincere selfish relaying.
Description
Technical field
The invention belongs to field of information security technology more particularly to a kind of peaces for improving insincere relaying portable communications system
The method of full rate.
Background technique
Currently, the prior art commonly used in the trade is such that due to can be realized classification gain and expanding wireless network
Coverage area, relaying auxiliary cooperative transmission become a big research hotspot in recent years.But relaying is all assumed in general research
It is believable.In practice, due to the addition interference in the complexity and transmission of network structure, the safety of relaying is than signal source
It is low.Relaying is in practice likely to be listener-in or malice relays.Certain hidden danger is thus brought to secure communication.It is relayed in eavesdropping
Middle raising safety of physical layer just seems very necessary.Under conditions of general power is certain, how optimal power distribution side is found
Case is optimal the safe rate of system and performance, becomes present research direction." the X.He and of the prior art one
A.Yener,“Two-hop secure communication using an untrusted relay,”EURASIP
The boundary of secrecy rate is proposed in J.Wireless Commun.Netw., vol.2009, a pp.1-13,2009 " text.In addition, making
Person derives secrecy rate upper bound when insincere relaying.And illustrates that amplification forwarding (AF) is relayed and non-zero secrecy rate and high can be achieved
In decode-and-forward relay (DF).But energy caused by the relaying proposed is generated by oneself.In fact, although relaying
It is ready to transmit information to signal source, but it may be unwilling to be relayed using the power of oneself.In other words, in addition to potentially stealing
Hearer's identity, relaying may be selfish.It is ready to be relayed using the collection energy of two source signals.Therefore, it harvests
Energy (EH) can extend using the time and ensure the sustainability of signal.The prior art two " Z.Chen, L.X.Cai,
Y.Cheng,H.Shan,"Sustainable cooperative communication in wireless powered
networks with energy harvesting relay",IEEE Trans.Wireless Commun.,vol.16,
In no.12, pp.8175--8189, Oct.2017. " text, author studies one-way junction system, proposes a kind of excellent
The joint time scheduling and power distribution problems of change, to maximize the handling capacity of system.And it has studied by harvesting energy (EH)
The secret and safe problem rate of the cognition Internet of Things network of the insincere relaying carried out.But research achievement is only applicable in unidirectional
After system, how to be improved and distrusted with the safe rate of the bidirectional relay system of selfish relaying still by optimal energy allocation
It is not well solved.
In conclusion problem of the existing technology is:
(1) energy caused by the relaying of the prior art one is to be generated by oneself, and relaying may be unwilling using certainly
Oneself power relays, and in addition to potential listener-in's identity, relaying may be selfishness, can only use the receipts of two source signals
Collect energy to be relayed；Therefore original power distribution method is no longer applicable in, it is necessary to consider that a part of power will be relaying
Energy is provided, a part is received for signal.So needing to consider the power allocation factor of a relaying.
(2) what the prior art two considered is one-way junction system, and bilateral system is than one-way system that structure is complicated, and channel holds
Amount and safe capacity expression are complicated, so the technology is not particularly suited for bilateral system.For bidirectional relay system, structure again is needed
Rate of making contributions allocation optimization problems.
Solve the difficulty and meaning of above-mentioned technical problem:
Signal forwarding is carried out using the collection energy of two source signals due to relaying, it is different from traditional relay system, it needs
Channel capacity and safe capacity expression formula are updated, and increases an additional power factor, needs the function of source node
Rate carries out combined optimization.
Different from one-way junction system, in bidirectional relay system, two one-way communications carry out in a channel simultaneously,
Channel capacity and safe capacity expression are complicated, increase the solution difficulty of optimization problem.Bi-directional relaying can be from when 4 transmission
Gap is reduced to 2 transmission time slots, improves the availability of frequency spectrum of system.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of peaces for improving insincere relaying portable communications system
The method of full rate.
The invention is realized in this way a method of improve the safe rate of insincere relaying portable communications system, institute
State the mathematical model that the method for improving the safe rate of insincere relaying portable communications system establishes bidirectional relay system；In calculating
After the signal received in the first slot and the energy collected from source, then via the second obtained letter in time slot signal source
Number；Obtain the signal-to-noise ratio and channel capacity for the channel being relayed between two sources；If finally calculating relaying as listener-in is
Signal-to-noise ratio and channel capacity, obtain optimal solution more afterwards.
Further, it is described calculate first time slot relay reception to signal and the energy of collection specifically include: relaying r with
Channel gain between source a and b is h respectivelyAAnd hBIt indicates, the transmission power of a and b are respectively by PAAnd PBIt indicates；One when
In gap, a and b transmit a signal to relaying r simultaneously, the signal that relay reception arrives:
Wherein nRIt is zero to receive introducing mean value in relaying at r, variance is the additive white Gaussian noise of N0；Relay receiver
The signal received isThe energy of collection is ER=η ρ (PAgA+PBgB)；Wherein η is the decay factor of energy, and ρ is relaying
Power allocation factor, gA=| hA|2,gB=| hB|2。
Further, the signal that two sources receive in the second time slot of the calculating specifically includes: by the second time slot, relaying
Become after being amplified by collection of energyRelaying the unity power signal sent isWherein
nBRIt is the white Gaussian noise that zero variance is N0 for mean value；Then obtaining the signal that two sources a and b are received in the second time slot isWith
Further, the signal-to-noise ratio and channel capacity of the calculating source to relaying specifically include: a and b obtains themselves
Original signal finds out the signal-to-noise ratio of relaying r to a and b:
Obtain relaying r to a and b channel capacity:
Further, the signal-to-noise ratio calculated when eavesdropping relays and channel capacity specifically include:, will when r is listener-in
Attempt to intercept the information from information receiver.Calculate the signal-to-noise ratio of r to a and b are as follows:
Obtain the channel capacity of r to a and b when eavesdropping relaying:
Channel capacity when by relaying safely subtracts channel capacity when eavesdropping relaying, obtains the guarantor of half-duplex channel at this time
Close rate are as follows:
Further, the safe rate for calculating half-duplex channel specifically includes:
Finding optimal solution makes the sum of the channel capacity of two channels reach maximum, obtains:
It is obtained by using high s/n ratio to simplify objective function:
Further, the secrecy rate is split are as follows: the function of power and the function of ρ；
(1) power distribution optimal solution is calculated；
Objective function and constraint condition are as follows:
s.t.0≤PA+PB≤PT；
Obtain the Lagrangian of objective function are as follows:
The only one optimal solution of objective function can be acquired by lagrange's method of multipliers:
(2) optimal solution of relay power distribution factor:
S.t.0 < ρ < 1；
Zero is set by the derivative of objective function, obtaining optimal solution is Rootof (w1ρ4+w2ρ3+w3ρ2+w4ρ+w5),
The root of Rootof () representative polynomial.w1=2 η2gAgB-ηgA-ηgB, w2=-4 η2gAgB+5ηgA+5ηgB- 2, w3=-6 η gA-6η
gB+ 6, w4=2 η gA+2ηgB- 6, w5=2.
Another object of the present invention is to provide a kind of using the safety for improving insincere relaying portable communications system
The information safety control system of the method for rate.
Another object of the present invention is to provide a kind of using the safety for improving insincere relaying portable communications system
The relaying of the method for rate assists collaborative transmission system.
Another object of the present invention is to provide a kind of using the safety for improving insincere relaying portable communications system
The information data processing terminal of the method for rate.
In conclusion advantages of the present invention and good effect are as follows: the present invention considers the collection of energy of relaying, when relaying is logical
When crossing collection of energy, guarantees the sustainability of signal and be easily achieved；Secrecy rate optimization problem is divided into two independent to ask
Topic: transmission power assignment problem and power splitter optimization problem；Two problems are solved respectively, realize closing form
Solution, and by computer simulation, it proposes and how to determine that the position of relaying r is optimal secrecy rate.Consider simultaneously
Insincere and selfish factor is relayed, the optimization when relaying is listener-in to communication system security rate is proposed.
The invention proposes in the presence of insincere and selfish relaying, need to obtain energy from signal source when relaying
When amount, the problem of how carrying out safe rate of the collection of energy of power distribution and relaying to improve bidirectional relay system.This hair
It is bright existing for the insincere and selfish relaying under the conditions of, make the safety speed that bidirectional relay system is improved under EH relay condition
Rate.
Detailed description of the invention
Fig. 1 is the method flow of the safe rate provided in an embodiment of the present invention for improving insincere relaying portable communications system
Figure.
Fig. 2 is that the method for the safe rate provided in an embodiment of the present invention for improving insincere relaying portable communications system is
System model schematic.
Fig. 3 is the reality of the method for the safe rate provided in an embodiment of the present invention for improving insincere relaying portable communications system
Existing flow chart.
Fig. 4 is the bidirectional relay system schematic diagram of hypothesis provided in an embodiment of the present invention；
In figure: a and b is respectively source, and r is relaying.
Fig. 5 is that the relationship of intermediate position and safe rate is illustrated under the conditions of signal-to-noise ratio provided in an embodiment of the present invention is 15dB
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
It can only be relayed using the collection energy of two source signals for the prior art；Relaying can be by using battery
Or the modes such as charging are supplemented energy and are extended using the time, but it is expensive and extremely inconvenient；The energy damage of signal is not accounted for
The problem of consumption；The present invention improves the algorithm of safety of physical layer rate in the case where providing the insincere selfish junction network of raising；?
It can be applied in bi-directional relaying, so that instantaneous safe rate and energy be made to reach Pareto optimality.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, the side of the safe rate provided in an embodiment of the present invention for improving insincere relaying portable communications system
Method the following steps are included:
S101: the model of the communication process of the bilateral relay network of a double bounce is built；
S102: the energy that the signal and own for calculating the first time slot relay forwarding are collected；
S103: the signal and their signal-to-noise ratio and channel capacity that two sources receive in the second time slot are calculated；
S104: the eavesdropping relaying obtained instantaneous signal-to-noise ratio in two sources and corresponding channel capacity in calculating；
S105: the secrecy rate of the channel in two sources of calculating to relaying；
S106: optimizing secrecy rate, finds out two optimal transmission powers in source of A and B and relaying themselves capture energy
Proportionality coefficient.
Application principle of the invention is further described with reference to the accompanying drawing.
The model of communication system that the present invention establishes is that there are three the double bounce half-duplex relay networks of node for tool.System is by two
Source a and b and bi-directional relaying r are constituted.All nodes all have single antenna and work in a half duplex mode.R is turned using amplification
Agreement is sent out to relay the signal of active transmission.In all trunk protocols, amplification forwarding (AF) is forwarded compared to decoding
Than when it is the simplest, i.e., relaying only needs to amplify the signal that receives and is transmitted to receiving end.Specific system diagram is shown in Fig. 4.
Step 1: calculating the energy of first time slot the relay reception signal arrived and collection
If the channel gain relayed between r and source a and b is h respectivelyAAnd hBIndicate, the transmission power of a and b respectively by PA and
PB is indicated.Then a time slot in, a and b transmit a signal to relaying r simultaneously, the signal that relay reception arrives:
Wherein nRIt is zero to receive introducing mean value in relaying at r, variance is the additive white Gaussian noise of N0.In view of relaying
The collecting signal from source, therefore the signal received is divided into two parts, the signal that relay receiver receives isIt is received
The energy integrated is ER=η ρ (PAgA+PBgB).Wherein η is the decay factor of energy, and ρ is the power allocation factor of relaying.gA=| hA
|2,gB=| hB|2。
Step 2: calculating the signal that two sources receive in the second time slot；
By the second time slot, relaying becomes after being amplified by collection of energyThen the unit power letter of transmission is relayed
Number it isWherein nBRIt is the white Gaussian noise that zero variance is N0 for mean value.It then obtains two in the second time slot
The signal that a source a and b is received isWith
Step 3: signal-to-noise ratio and channel capacity of the source of calculating to relaying；
It is assumed that a and b can obtain themselves original signal, the signal-to-noise ratio of relaying r to a and b can be found out:
And then relaying r to a and b channel capacity can be obtained:
Step 4: signal-to-noise ratio and channel capacity when calculating eavesdropping relaying:
When r is listener-in, it will attempt to intercept the information from information receiver.Calculate the letter of r to a and b at this time
It makes an uproar ratio are as follows:
It can obtain the channel capacity of r to a and b when eavesdropping relaying:
Channel capacity when at this time by relaying safely subtracts channel capacity when eavesdropping relaying, available at this time unidirectional
The secrecy rate in channel are as follows:
Step 5: the safe rate of half-duplex channel is calculated:
Finding optimal solution makes the sum of the channel capacity of two channels reach maximum, obtains:
Due to objective function complexity, objective function is simplified by using high s/n ratio, is obtained:
It can be split as two parts to secrecy rate at this time, a part is the function of power, i.e. transmission power assignment problem, another
Part is the function of ρ, i.e. the optimization problem of relaying collection energy.
A, power distribution optimal solution is calculated
Objective function and constraint condition are as follows:
s.t.0≤PA+PB≤PT；
The Lagrangian of available objective function are as follows:
The only one optimal solution of objective function can be acquired by lagrange's method of multipliers:
B, the optimal solution of relay power distribution factor:
S.t.0 < ρ < 1；
Zero is set by the derivative of objective function, it is Rootof (w that optimal solution, which can be obtained,1ρ4+w2ρ3+w3ρ2+w4ρ+w5), this
In Rootof () representative polynomial root.w1=2 η2gAgB-ηgA-ηgB, w2=-4 η2gAgB+5ηgA+5ηgB- 2, w3=-6 η gA-
6ηgB+ 6, w4=2 η gA+2ηgB- 6, w5=2.
Application effect of the invention is explained in detail below with reference to emulation.
In embodiment, by computer simulation come real proposed power distribution image.The present invention sets three sections
Point is located in a straight line, and relaying is located between two source nodes.Loss of signal η=0.9, signal transmit slow fading loss factor
Normalized cumulant between A and B is unified and uses d by τ=3RIndicate the normalized cumulant of A to R.
Intermediate position d under the conditions of 15dB signal-to-noise ratio is designated in Fig. 5RPass between corresponding safe rate
System.In order to compare, the result of constant power distribution is also given.It can be seen that the power proposed divides regardless of intermediate position
It is distributed with constant power is superior to.Secrecy rate is in dRReach optimum performance when=0.5, the power distribution proposed at this time may be implemented
Insincere relaying portable communications system is optimal by group rate.
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 (10)
1. a kind of method for the safe rate for improving insincere relaying portable communications system, which is characterized in that the raising can not
The method of the safe rate of letter relaying portable communications system establishes the mathematical model of bidirectional relay system；Relaying is calculated at first
The signal received in gap and the energy collected from source, then via the second obtained signal in time slot signal source；It is relayed
To the signal-to-noise ratio and channel capacity of the channel between two sources；If finally calculating signal-to-noise ratio and letter that relaying is as listener-in
Road capacity, obtains optimal solution more afterwards.
2. improving the method for the safe rate of insincere relaying portable communications system as described in claim 1, which is characterized in that
It is described calculate first time slot relay reception to signal and the energy of collection specifically include: the letter between relaying r and source a and b
Road gain is h respectivelyAAnd hBIt indicates, the transmission power of a and b are respectively by PAAnd PBIt indicates；A time slot in, a and b are simultaneously
Relaying r is transmitted a signal to, the signal that relay reception arrives:
Wherein nRIt is zero to receive introducing mean value in relaying at r, variance is the additive white Gaussian noise of N0；Relay receiver receives
To signal beThe energy of collection is ER=η ρ (PAgA+PBgB)；Wherein η is the decay factor of energy, and ρ is the function of relaying
Rate distribution factor, gA=| hA|2,gB=| hB|2。
3. improving the method for the safe rate of insincere relaying portable communications system as described in claim 1, which is characterized in that
The signal that two sources receive in the second time slot of the calculating specifically includes: by the second time slot, relaying is put by collection of energy
Become after bigRelaying the unity power signal sent isWherein nBRIt is zero side for mean value
Difference is the white Gaussian noise of N0；Then obtaining the signal that two sources a and b are received in the second time slot isWith
4. improving the method for the safe rate of insincere relaying portable communications system as described in claim 1, which is characterized in that
The signal-to-noise ratio and channel capacity of the calculating source to relaying specifically include: a and b obtains themselves original signal, finds out
After the signal-to-noise ratio of r to a and b:
Obtain relaying r to a and b channel capacity:
5. improving the method for the safe rate of insincere relaying portable communications system as described in claim 1, which is characterized in that
The signal-to-noise ratio calculated when eavesdropping relays and channel capacity specifically include: when r is listener-in, will attempt to intercept and carry out self-information
The information of recipient；Calculate the signal-to-noise ratio of r to a and b are as follows:
Obtain the channel capacity of r to a and b when eavesdropping relaying:
Channel capacity when by relaying safely subtracts channel capacity when eavesdropping relaying, obtains the secrecy rate of half-duplex channel at this time
Are as follows:
6. improving the method for the safe rate of insincere relaying portable communications system as claimed in claim 5, which is characterized in that
The safe rate for calculating half-duplex channel specifically includes:
Finding optimal solution makes the sum of the channel capacity of two channels reach maximum, obtains:
It is obtained by using high s/n ratio to simplify objective function:
7. improving the method for the safe rate of insincere relaying portable communications system as claimed in claim 5, which is characterized in that
The secrecy rate is split are as follows: the function of power and the function of ρ；
(1) power distribution optimal solution is calculated；
Objective function and constraint condition are as follows:
s.t.0≤PA+PB≤PT；
Obtain the Lagrangian of objective function are as follows:
The only one optimal solution of objective function can be acquired by lagrange's method of multipliers:
(2) optimal solution of relay power distribution factor:
S.t.0 < ρ < 1；
Zero is set by the derivative of objective function, obtaining optimal solution is Rootof (w1ρ4+w2ρ3+w3ρ2+w4ρ+w5), Rootof
The root of () representative polynomial；w1=2 η2gAgB-ηgA-ηgB, w2=-4 η2gAgB+5ηgA+5ηgB- 2, w3=-6 η gA-6ηgB+ 6,
w4=2 η gA+2ηgB- 6, w5=2.
8. a kind of safe rate using the insincere relaying portable communications system of raising described in claim 1~7 any one
The information safety control system of method.
9. a kind of safe rate using the insincere relaying portable communications system of raising described in claim 1~7 any one
The relaying of method assists collaborative transmission system.
10. a kind of safe rate using the insincere relaying portable communications system of raising described in claim 1~7 any one
The information data processing terminal of method.
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| CN111246577A (en) * | 2020-01-08 | 2020-06-05 | 浙江工业大学 | Method for maximizing transmission and rate in wireless energy-carrying communication relay network |
| CN111246577B (en) * | 2020-01-08 | 2023-06-13 | 浙江工业大学 | Method for maximizing transmission and speed in wireless energy-carrying communication relay network |
| CN113473566A (en) * | 2021-06-24 | 2021-10-01 | 河南大学 | Robust wireless energy-carrying relay cooperation safety communication method |
| CN114302490A (en) * | 2021-12-31 | 2022-04-08 | 杭州电子科技大学 | Relay power setting method for guaranteeing information transmission safety considering relay trust degree |
| CN114302490B (en) * | 2021-12-31 | 2024-04-02 | 杭州电子科技大学 | Relay power setting method for guaranteeing information transmission safety by considering relay trust |
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