CN109890039A - It is general to interfere lower SWIPT relay resource distribution method - Google Patents
It is general to interfere lower SWIPT relay resource distribution method Download PDFInfo
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Abstract
The invention discloses a kind of general lower SWIPT relay resource distribution method of interference, the relay system based on DF is established optimization problem as target to maximize non-interrupted probability, and is solved using Fibonacci method, obtains optimal h2And maximum non-interrupted probability.It is shown by emulation experiment, under different parameters, the non-interrupted probability of relay system can be effectively improved using this method.
Description
Technical field
The present invention relates to relay resource distribution technique field, in more particularly to a kind of lower SWIPT of general interference
After resource allocation methods.
Background technique
With the arrival in 5G epoch and the expansion of wireless network scale, the number of nodes is being sharply increased.It passes
The network node of system uses battery supplied energy, this means that network node limited life cycle.In face of more and more saving
Point, a large amount of manpower and material resources will obviously be expended by replacing battery for them.However, letter can simultaneous interpretation (Simultaneous Wireless
Information and Powe rTransfer, SWIPT) emergence and development of technology provide new think of to solve this problem
Road.SWIPT technology can make the node in wireless network carry out collection of energy by radiofrequency signal, and utilize the energy being collected into
Carry out information reception.The drawbacks of this technique avoids frequent replacement batteries, and can greatly extend the longevity of nodes
Life.Therefore, the application of SWIPT technology in the wireless network is concerned.
SWIPT technology can effectively promote the availability of frequency spectrum of network, reduce delay, reduce power consumption, therefore, many scholars
Consider SWIPT technology being applied to relay communications system.And SWIPT is applied to relay system, needs to take reasonable resource point
Improve relay system performance with strategy.It is the period that existing SWIPT relay resource distribution method, which has generally only taken into account interference,
The case where information, however in practical applications, interference is frequently not periodically to occur, but random.
Therefore, how for general interference provide a kind of SWIPT relay resource distribution method be those skilled in the art urgently
Problem to be solved.
Summary of the invention
In view of this, the present invention provides a kind of general lower SWIPT relay resource distribution method of interference, this method can have
The non-interrupted probability of effect ground lifting system.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of lower SWIPT relay resource distribution method of general interference, comprising:
(1) the relay system model based on DF is established；
(2) model established based on step (1) defines the non-interrupted Probability p of whole linknon=p1p2；Wherein,For the non-interrupted probability of transmitted from transmitter to receiver；
For the non-interrupted probability for being relayed to receiver；Wherein, PsFor the mean power for emitting signal, PRFor the power of forward signal, r0For
Transmission rate threshold, ε are straight line h2With h axis intersection point, h1For the region DF and EH region segmentation line,h2
For resource allocation lineI is the performance number I, θ for interfering iIFor the expectation of I, θhFor the phase of channel gain h
It hopes, θgFor the expectation of channel gain g, and channel gain h and g obey index；
(3) optimization problem P5 is established as target to maximize non-interrupted probability:
(P5)max pnon(ε)=p1p2
(4) the optimization problem P5 in step (3) is solved using Fibonacci method, finds out optimal resource allocation point
Secant h2And maximum non-interrupted probability.
In order to further optimize the above technical scheme, step (4) specifically includes:
Step 1: the value interval [a, b] and precision e of given initialization ε；
Step 2: solution interval golden section point a1=a+ (1-0.618) (b-a), a2=a+0.618 (b-a)；
Step 3: if non-interrupted Probability pnon(a1) < pnon(a2), step 4 is jumped to, step 5 is otherwise jumped to；
Step 4: if a2-a1< e stops iteration, exports optimal solution x*=a1, the maximum non-interrupted probability of outputOtherwise, a=a is enabled1, a1=a2, a2=a+0.618 (b-a), jumps to step 3；
Step 5: if a2-a1< e stops iteration, exports optimal solution x*=a2, the maximum non-interrupted probability of outputOtherwise, b=a is enabled2, a2=a1, a1=a+ (1-0.618) (b-a), jumps to the 3rd step.
It can be seen via above technical scheme that compared with prior art, the present disclosure provides under a kind of general interference
SWIPT relay resource distribution method, the relay system based on DF establish optimization problem as target to maximize non-interrupted probability,
Optimal h is found out using Fibonacci method2And maximum non-interrupted probability.It is shown by emulation experiment, under different parameters,
The non-interrupted probability of relay system can be effectively improved using this method.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is SWIPT relay resource distribution method structural schematic diagram under general interference provided by the invention；
Fig. 2 is the relay system model schematic provided by the invention based on DF；
Fig. 3 is that relaying time slot provided by the invention divides schematic diagram；
Fig. 4 is h-I resource allocation coordinate system provided by the invention；
Fig. 5 is h provided by the invention2Method resource allocation schematic diagram；
Fig. 6 is the non-interrupted probability provided by the invention using TS Y-factor method Y relay system；
Fig. 7 is provided by the invention using h2The non-interrupted probability of method relay system；
Fig. 8 is different interrupt rate r provided by the invention0The maximum non-interrupted probability of lower relay system；
Fig. 9 is that different circuits provided by the invention consume power PcThe maximum non-interrupted probability of lower relay system；
Figure 10 is disturbance parameter θ provided by the inventionIThe maximum non-interrupted probability of lower relay system.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to attached drawing 1, the embodiment of the invention discloses a kind of general lower SWIPT relay resource distribution methods of interference, comprising:
(1) the relay system model based on DF is established；
(2) model established based on step (1) defines the non-interrupted Probability p of whole linknon=p1p2；Wherein,For the non-interrupted probability of transmitted from transmitter to receiver；
For the non-interrupted probability for being relayed to receiver；Wherein, PsFor the mean power for emitting signal, PRFor the power of forward signal, r0For
Transmission rate threshold, ε are straight line h2With h axis intersection point, h1For the region DF and EH region segmentation line,h2
For resource allocation lineI is the performance number I, θ for interfering iIFor the expectation of I, θhFor the phase of channel gain h
It hopes, θgFor the expectation of channel gain g, and channel gain h and g obey index；
(3) optimization problem P5 is established as target to maximize non-interrupted probability:
(P5)max pnon=p1p2
(4) the optimization problem P5 in step (3) is solved using Fibonacci method, finds out optimal resource allocation point
Secant h2And maximum non-interrupted probability.
In order to further disclose above-mentioned technical proposal, step (4) is specifically included:
Step (4) specifically includes:
Step 1: the value interval [a, b] and precision e of given initialization ε；
Step 2: solution interval golden section point a1=a+ (1-0.618) (b-a), a2=a+0.618 (b-a)；
Step 3: if non-interrupted Probability pnon(a1) < pnon(a2), step 4 is jumped to, step 5 is otherwise jumped to；
Step 4: if a2-a1< e stops iteration, exports optimal solution x*=a1, the maximum non-interrupted probability of outputOtherwise, a=a is enabled1, a1=a2, a2=a+0.618 (b-a), jumps to step 3；
Step 5: if a2-a1< e stops iteration, exports optimal solution x*=a2, the maximum non-interrupted probability of outputOtherwise, b=a is enabled2, a2=a1, a1=a+ (1-0.618) (b-a), jumps to the 3rd step.
In the case where existing interference is cycle information, relaying mostly uses AF pass-through mode, its advantage is that system structure
Simply, circuit consumption energy is small.But under general interference, AF pass-through mode is performed poor.Because being done in general interference environment
It disturbs and always exists, and aperiodicity occurs, and relays while amplifying to signal, also carries out interference signal and noise
Amplification, this will obviously make Signal-to-Noise reduce, be unfavorable for system information transmissions.And the advantages of DF, is, before forward signal,
Relaying first docking breath of collecting mail is decoded, this is filtered out interference in original signal and noise, avoids interference and noise
Further transmitting.Therefore, in general interference environment, relaying is more suitable for using DF pass-through mode.
It is as shown in Figure 2 using the relay system model of DF pass-through mode.It should be noted that it is different from AF pass-through mode,
DF pass-through mode needs to be decoded information, needs to consume certain energy.The energy that system is collected into is divided into two parts,
A part is used for forwarding information, it is assumed that the power of forward signal is PR；Another part is consumed by decoding circuit, it is assumed that consumption energy
The power of amount is PC。
In Fig. 2, the transmitting signal of transmitter is usedIt indicates, mean power PS.Signal is arrived by wireless channel
Up to relaying, channel gain h, while reaching the also general interference signal i of relaying.yRIndicate the signal that relay reception arrives, nRIt is
Relay antenna noise.The signal of relay reception is divided into two-way by time-switching device, and upper road signal is for decoding forwarding, lower road letter
Number for collecting energy, and providing size for forward signal is PRAmplifying power is forwarded, is x by amplified signalR.Through
The wireless channel that channel gain is g is crossed, signal reaches receiver, and the signal received is represented as yD.Meanwhile receiver day
Line noiseIt is introduced into.
In general interference environment, the signal-to-noise ratio of relaying and receiver received signal is influenced by channel status, when
When channel status is good, the signal-to-noise ratio for receiving signal is high, conversely, the signal-to-noise ratio of signal can be very poor.Moreover, continuous with interference
Variation, the signal-to-noise ratio of signal can also fluctuate.In conjunction with attached drawing 2, channel gain h is considered, g is mutually independent random variables,
And it obeys be desired for θ respectivelyhAnd θgExponential distribution.Relaying uses TS operation reserve, relay at this time there are two types of operating mode,
It is respectively defined as decoding forwarding (DF) mode and collection of energy (EH) mode.Relaying can judge itself most according to h, I and g
Excellent working condition, wherein I is interference power values.As shown in figure 3, communication process is divided into several time slots, and assume that relaying can
To obtain channel state information, i.e. h, I and g.When a time slot arrives, for relaying by judging channel state information, determining will
The time slot allocation is to EH or DF.
Referring to attached drawing 2, first consider that under a certain channel status, relaying is terminated from transmitter to this communication process is relayed
The collection of letters number indicates are as follows:
The Signal-to-Noise are as follows:
At this point, prompting message rate can be expressed as
Relaying collection of energy power is
PEH=η (hPS+I)
Wherein, η is energy conversion efficiency, for convenience's sake, enables η=1 herein.
Consider delay limitation transmission, i.e. transmission rate is lower than threshold value r0When will lead to communication disruption, by transmitter to relaying
The outage probability of communication indicates are as follows:
Define non-interrupted Probability p1=1-pout, p1It can so indicate are as follows:
Consider further that under a certain channel status, receiver receives signal from this communication process of receiver is relayed in Fig. 2
Are as follows:
In formula, xRIndicating the forward signal of relaying, it is assumed that relaying can be correctly decoded information, thenTherefore
The signal-to-noise ratio of receiver reception signal are as follows:
At this point, being relayed to the prompting message rate of receiver can indicate are as follows:
It is also contemplated that threshold value is r0Delay limit transmission, be relayed to the non-interrupted Probability p of receiver2It can be expressed as follows:
Using h as the longitudinal axis, using I as horizontal axis, available h-I coordinate system, referred to as resource allocation coordinate system, as shown in Figure 4.
If h and I must satisfy it is required that transmitter cannot be interrupted to relay transmission:
Abbreviation can obtain:
It enablesThe condition that transmitter to relay transmission does not interrupt is mapped to h-I
Coordinate system, then h in non-interrupted region, that is, Fig. 41Dash area above straight line.It will not be interrupted in this area transmissions information,
Relaying should work in DF mode, therefore the region is known as the region DF.In contrast, in h1Lower region, which carries out information transmission, to lead
It causes to interrupt, therefore, h1Lower zone relaying should work in EH mode, which is known as the region EH.Relay the energy quilt collected
It is divided into two parts, can be indicated with formula are as follows:
PEH=PC+PR
PEHFor collection of energy power, PCFor the constant power of circuit consumption, therefore, PRSize depend on relaying energy receive
Collect the size of power.For being relayed to receiver, communication, which is not interrupted, to be needed to meet RRD≥r0, i.e.,For
Different channel status g, relaying need different repeating powers just to can ensure that communication is not interrupted.Therefore, it is needed in Fig. 4 from solution
Code Relay Region marks off certain region for collection of energy.Define resource allocation line h2It is perpendicular to the straight line of h axis,
Intersection point with h axis is (0, ε), as shown in Figure 5.h2With h1Common upper area is divided for collection of energy out, h axis,
h1And h2The delta-shaped region collectively formed is for decoding forwarding.h1Intersection point with h axis is Transmitting
Machine is always for relay transmission information, therefore the delta-shaped region of dash area cannot be 0, then resource allocation line needs completely
FootThat is the value range of ε is
The region DF and the region EH distribution condition for Fig. 5, the non-interrupted probability of transmitted from transmitter to receiver can indicate are as follows:
Above formula integral representation are as follows:
Relay the mean power of collection of energy are as follows:
After obtaining the mean power of relaying collection of energy, according to PEH=PC+PR, the average repeating power of available relaying
Are as follows:
E[PR]=E [PEH]-PC
The non-interrupted probability for being relayed to receiver can be expressed as integration type:
The non-interrupted probability for defining whole link is pnon, whole link communication do not interrupt, it is necessary to while meeting transmitter and arriving
Relaying does not interrupt, and is relayed to receiver and does not interrupt, therefore the non-interrupted probability of whole link can indicate are as follows:
pnon=p1p2
At this point, establishing optimization problem P5 as target to maximize non-interrupted probability:
(P5)max pnon=p1p2
The optimization problem can be solved using Fibonacci method.
Technical solution provided by the present invention is described further below with reference to specific experiment emulation.
Subsequent description for convenience, referred to as by SWIPT relay resource distribution method under general interference provided by the invention
For h2Method.
The present invention is to h2Method carries out simulating, verifying, and is compared with the method for optimization TS coefficient.The emulation used
Parameter setting is as follows, PS=5, PC=0.5, r0=0.2, θh=1, θI=5, θg=1,
Referring to attached drawing 6, Fig. 6 is that can intuitively be found out from figure using the non-interrupted probability of TS Y-factor method Y relay system: when
TS coefficient increases, and the non-interrupted probability of system first increases to be reduced afterwards, and as α=0.22, and the non-interrupted rate of system reaches maximum,
pnon=0.59.
Fig. 7 is relaying using h2When method, the non-interrupted probability of system is with resource allocation line h2Variation analogous diagram.From figure
It can be seen that non-interrupted Probability p of the transmitter to relaying1As the increase of ε is gradually increased, this is because the increase of ε is so that Fig. 5
In the region DF increase, and p1It is to integrate on the area, therefore, p1It will increase.It is non-interrupted but after ε increases to certain value
Probability p1It is held essentially constant, this is because increasing in the widened DF integral domain of institute in ε, becomes to the integral of probability density function
It is bordering on 0.It is relayed to the non-interrupted Probability p for connecing the machine of penetrating2Reduce with the increase of ε, this is because the region EH in Fig. 5 reduces,
It relays the energy received to reduce, repeating power is caused to reduce, so that forward signal signal-to-noise ratio declines, non-interrupted probability drop
It is low.Optimal segmentation line, h can be found out using Fibonacci method2=6.43, the non-interrupted probability of system is p at this timenon=0.68.By
This is as it can be seen that using h2The non-interrupted probability of system can be improved 15.3% by method.
Under different parameters, h2Method shows different performances.As shown in figure 8, fixed system other parameters, adjust and interrupt
Rate r0.With r0Increase, using h2Method and be all gradually reduced using the non-interrupted probability of relaying of TS Y-factor method Y, this be because
For the raising of interrupt rate, so that system requires to improve to the signal-to-noise ratio of signal, therefore in the case where other conditions are constant, believe
Communication disruption can occur for relatively low signal of making an uproar, this also has led to the reduction of non-interrupted probability.However, it is possible to, it is evident that
Using h2The non-interrupted probability of relaying of method is greater than the h not used2The non-interrupted probability of the relaying of method, and the former decline
Speed is slow, and gap between the two is with r0Increase and increase.Therefore, the relay system high to delay transmission requirement is more suitable for
Using h2Method.
Fixed system other parameters adjust circuit and consume power PC, different non-interrupted probability is obtained, as shown in Figure 9.With
PCIncrease, using h2The non-interrupted probability of relaying of method and use TS Y-factor method Y is all gradually reduced, this is because circuit consumes
On the one hand the raising of power makes relaying need to distribute more resources for collection of energy, to reduce the region DF in Fig. 5
Area.On the other hand, for the power P of forward signalRReduce, reduces the signal-to-noise ratio of forward signal.Therefore in other conditions
In the case where constant, this also has led to the reduction for relaying non-interrupted probability.However, it can be seen from fig. 9 that using h2Method
The non-interrupted probability of relaying to be significantly greater than the non-interrupted probability using TS Y-factor method Y.
As shown in Figure 10, fixed system other parameters adjust interference parameter θI.With θIIncrease, using h2It method and adopts
It is all gradually reduced with the non-interrupted probability of the relaying of TS Y-factor method Y, this is because the raising of jamming power, so that System relays receive
The signal-to-noise ratio of signal declines, therefore in the case where other conditions are constant, and non-interrupted probability reduces.But it can be with from Figure 10
, it is evident that using h2The non-interrupted probability of relaying of method is greater than the non-interrupted probability using TS Y-factor method Y, and uses h2Side
The non-interrupted probability decline of method is very slow.This is because interfere it is stronger when or channel status it is poor, relaying can be switched to receipts energy
Mode；When interfering weaker or channel status preferable, relaying is switched to decoding forward mode.And for using TS Y-factor method Y
Relaying for, no matter interfere size, the quality of channel status, relaying can only carry out energy according to regular time handoff factor
The conversion with decoding forwarding, therefore state larger for some jamming powers or that channel status is poor are collected, using TS system
The relay system of number method is likely to be at decoding forward mode, this also allows for relay reception signal or receiver received signal letter
It makes an uproar lower than very, eventually leads to the non-interrupted probability decline of relaying.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (2)
1. a kind of lower SWIPT relay resource distribution method of general interference characterized by comprising
(1) the relay system model based on DF is established；
(2) model established based on step (1) defines the non-interrupted Probability p of whole linknon=p1p2；Wherein,For the non-interrupted probability of transmitted from transmitter to receiver；
For the non-interrupted probability for being relayed to receiver；Wherein, PsFor the mean power for emitting signal, PRFor the power of forward signal, r0For
Transmission rate threshold, ε are straight line h2With h axis intersection point, h1For the region DF and EH region segmentation line,h2
For resource allocation lineI is the performance number I, θ for interfering iIFor the expectation of I, θhFor the phase of channel gain h
It hopes, θgFor the expectation of channel gain g, and channel gain h and g obey index；
(3) optimization problem P5 is established as target to maximize non-interrupted probability:
(P5)max pnon(ε)=p1p2
(4) the optimization problem P5 in step (3) is solved using Fibonacci method, finds out optimal resource allocation cut-off rule
h2And maximum non-interrupted probability.
2. SWIPT relay resource distribution method under general interference according to claim 1, which is characterized in that step (4) tool
Body includes:
Step 1: the value interval [a, b] and precision e of given initialization ε；
Step 2: solution interval golden section point a1=a+ (1-0.618) (b-a), a2=a+0.618 (b-a)；
Step 3: if non-interrupted Probability pnon(a1) < pnon(a2), step 4 is jumped to, step 5 is otherwise jumped to；
Step 4: if a2-a1< e stops iteration, exports optimal solution x*=a1, the maximum non-interrupted probability of outputOtherwise, a=a is enabled1, a1=a2, a2=a+0.618 (b-a), jumps to step 3；
Step 5: if a2-a1< e stops iteration, exports optimal solution x*=a2, the maximum non-interrupted probability of outputOtherwise, b=a is enabled2, a2=a1, a1=a+ (1-0.618) (b-a), jumps to step 3.
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| CN111225399A (en) * | 2020-02-26 | 2020-06-02 | 电子科技大学 | Relay forwarding and resource allocation method in wireless data energy simultaneous transmission cooperative communication |
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