CN106487482A - A kind of power dividing method that full duplex relaying wireless messages are transmitted with synchronous energy - Google Patents
A kind of power dividing method that full duplex relaying wireless messages are transmitted with synchronous energy Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
- H04W28/0221—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices power availability or consumption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention provides a kind of full duplex relaying wireless messages and the power dividing method of synchronous energy transmission, belong to field of wireless transmission.The power dividing method that a kind of this method full duplex relaying wireless messages are transmitted with synchronous energy, for full duplex relaying network, using the relay transceiver framework of power dividing, full duplex relaying node collecting energy from the radiofrequency signal of the source node receiving, realize wireless full-duplex information relaying；Power dividing based on full detail status information：Using the status information of the first jump, the second jump and relaying loop channel, by making end-to-end SINR maximize criterion or making the outage probability minimum criterion of system determine optimum power dividing ratio；Or the power dividing based on partial information status information：Jump and relay the status information of loop channel using first, by making end-to-end SINR maximize criterion or making the outage probability of system minimize the power dividing ratio that criterion determines optimum.
Description
Technical field
The invention belongs to field of wireless transmission is and in particular to a kind of full duplex relaying wireless messages and synchronous energy transmission
Power dividing method.
Background technology
In wireless application scene limited by physical condition or economic factor, energy acquisition technology has become as wireless cooperation
One of most important enabling tool in communication and radio sensing network.By carrying out EH, energy from the radiofrequency signal of context
Measure limited relaying or sensing node can avoid periodic power source charges or battery altering, this wireless biography to large scale deployment
Sense network has Great significance.Information and the phenomenon of energy, document can be carried in view of radiofrequency signal simultaneously
“Wireless information and power transfer:Architecture design and rate-energy
tradeoff,”(X.Zhou,R.Zhang,and C.K.Ho,IEEE Trans.Commun.,vol.61,no.11,pp.4754–
4767, Nov.2013.) propose based on time-switching (time switching, TS) and be based on power dividing (power
Splitting, PS) two kinds of systems that gear to actual circumstances receiver architecture, and in wireless messages and energy (power) synchronous transfer
Extensively adopted in (simultaneous wireless information and power transfer, SWIPT) technology
With.
In wireless relay network, SWIPT not only enables the via node of finite energy keep state of activation for a long time, and
And achieve remote or leaping over obstacles wireless messages relaying.For this application prospect, Nasir et al. proposes two apoplexy due to endogenous wind
Continue agreement, i.e. (TS-Based Relaying, the TSR) agreement of the relaying based on time-switching and the relaying based on power dividing
(PS-Based Relaying, PSR) agreement.For the collaborative network of spatial domain random distribution relaying, document " Wireless
information and power transfer in cooperative networks with spatially random
relays,”(Z.Ding,I.Krikidis,B.Sharif,and H.V.Poor,IEEE Trans.Wireless Commun.,
Vol.13, no.8, pp.4440 4453, Aug.2014) have studied interruption performance and the diversity performance of SWIPT.For in interference
Continue network, and document [13] proposes the SWIPT based on distributed power shunting.For existing in multiple source-destination nodes pair
Continue network, document " Power allocation strategies in energy harvesting wireless
cooperative networks,”(Z.Ding,S.M.Perlaza,I.Esnaola,and H.V.Poor,IEEE
Trans.Wireless Commun., vol.13, no.2, pp.846 860, Feb.2014) propose several power distribution sides
Method.At present, antenna switching and Antenna Selection Technology are also applied in junction network SWIPT.Turn for semiduplex amplification
Send out (Amplify-and-Forward, AF) junction network, document " Dynamic power splitting policies for
AF relay networks with wireless energy harvesting,”(L.Hu,C.Zhang,and Z.Ding,
In Proc.IEEE ICC 2015, London, UK, 8-12, June 2015, pp.1 5) propose one kind based on power distribution
SWIPT relaying technique.When individually not taken with transmitting due to the reception of full duplex relaying/frequency channel, its spectrum efficiency compares
Half-duplex relay is significantly increased, and the SWIPT for full duplex relaying network therefore suffers from paying attention to.Transmitted/received by independent connecing
Penetrate antenna and enter row information relaying and EH, document " Full-duplex wireless-powered relay with respectively
selfenergy recycling,”(Y.Zeng and R.Zhang,IEEE Wireless Commun.Lett.,vol.PP,
No.99, pp.1 1,2015) propose a kind of full duplex relaying method from self-interference.Document " Wireless
information and power transfer with full duplex relaying,”(C.Zhong,
H.Suraweera,G.Zheng,I.Krikidis,and Z.Zhang,IEEE Trans.Commun.,vol.62,no.10,
Pp.3447 3461, Oct.2014) then propose full duplex relaying SWIPT based on TSR agreement and the TS factor has been carried out excellent
Change design.Although the performance of PSR agreement is better than TSR agreement, in current full duplex relaying SWIPT, PSR agreement does not also have
The precedent of successful Application.
Existing power dividing method can be only applied to single-hop communication system and the SWIPT of half-duplex relay communication system, its
Spectrum efficiency is relatively low compared with full duplex relaying system.
Content of the invention
It is an object of the invention to solving a difficult problem present in above-mentioned prior art, provide a kind of full duplex relaying wireless communication
The power dividing method of breath and synchronous energy transmission is it is achieved that the wireless messages of full duplex relaying based on power dividing and energy
Synchronous transfer, and so that the outage probability of system is minimized, so that the spectrum efficiency of system is greatly improved.
The present invention is achieved by the following technical solutions：
A kind of power dividing method that full duplex relaying wireless messages are transmitted with synchronous energy, for full duplex relaying net
Network, using the relay transceiver framework of power dividing, full duplex relaying node gathers from the radiofrequency signal of the source node receiving
Energy, realizes wireless full-duplex information relaying；
Power dividing based on full detail status information：State using the first jump, the second jump and relaying loop channel
Information, by making end-to-end SINR maximize criterion or making the outage probability minimum criterion of system determine that the power of optimum divides
Flow ratio rate；
Or the power dividing based on partial information status information：Jump using first and the state of relaying loop channel is believed
Breath, by making end-to-end SINR maximize criterion or making the outage probability of system minimize the power dividing that criterion determines optimum
Ratio.
Described full duplex relaying network includes source node, destination node and full duplex relaying node；
Described source node and destination node are each configured with single antenna；Described full duplex relaying node is configured with reception antenna
And transmitting antenna；
The battery that the primary power of described full duplex relaying node is configured by it provides, and full duplex relaying node is from receiving
Radiofrequency signal in collecting energy, complete information relay processes.
Described full duplex relaying node is using the full duplex relaying node based on AF strategy.
It is provided with energy acquisition machine and baseband signal processor, from the radio frequency of source node on described full duplex relaying node
A signal part is admitted to energy acquisition machine, and another part is admitted to baseband signal processor.
Described it is realized in based on the power dividing of full detail status information：
It is assumed that via node can obtain complete CSI,
S1：Source node sending signal；
S2：Full duplex relaying node receipt signal；
S3：Obtain complete channel state information using channel estimation methods.
S4：Calculate the coefficient of biquadratic equation；
S5：Determine biquadratic equation；
S6：Solve biquadratic equation and determine power dividing ratio ρ；
S7：Full duplex relaying node is to the radiofrequency signal receiving by ρ：(1- ρ) carries out power dividing；
S8：The energy acquisition machine of full duplex relaying node carries out energy acquisition, and baseband signal processor carries out baseband signal
Process, and carry out signal amplification and forwarding using the energy of collection；
S9：The signal that destination node reception is sent by full duplex relaying node.
Described S4 is realized in：
Calculate the coefficient of biquadratic equation according to the following formula：
a0=1+ γSR,
a1=-2 (1+ η | f |2)(1+γSR),
a2=γSR-ηγRD+η2f|f|4(1+γSR)+η|f|2(5+γSR(4-ηγRD)),
a3=-2 η | f |2(γSR+η|f|2(2+γSR)-η(1+γSR)γRD),
a4=η2|f|2(η|f|2+γSR)(|f|2-γRD).
Wherein,
γSRSignal to noise ratio for source node-via node interchannel
γRDSignal to noise ratio for via node-destination node interchannel
F is relaying loop interference channel
η is energy conversion efficiency.
Described S5 is realized in：
Determine biquadratic equation according to the following formula：
Wherein, Q1(ρ)For determining the biquadratic equation of optimum power dividing ratio；
a1, a2, a3, a4, for calculating the biquadratic equation coefficient determining.
ρ is best power segregation ratio.
Described S6 is realized in：
Obtain the solution of biquadratic equation by Descartes-Euler-Cardano method or Ferrari-Lagrange method
Analysis solution, then determines power dividing ratio by following formula：
Wherein, γRDSignal to noise ratio for via node-destination node interchannel
F is relaying loop interference channel.
Described it is realized in based on the power dividing of partial information status information：
It is assumed that via node can only obtain the first hop channel and the CSI of relaying loop channel,
N1：Source node sending signal；
N2：Full duplex relaying node receipt signal；
N3：Obtain impaction of partial channel state information using channel estimation methods；
N4：；Calculate the coefficient of biquadratic equation and determine biquadratic equation；
N5：Solve biquadratic equation and determine power dividing ratio；
N6：Full duplex relaying node carries out power dividing to receipt signal by the power dividing ratio that N5 provides；
N7：The energy acquisition machine of full duplex relaying node carries out energy acquisition, and baseband signal processor carries out baseband signal
Process, and carry out signal amplification and forwarding using the energy of collection；
N8：The signal that destination node reception is sent by via node.
Described N4 is realized in：
Calculate the coefficient of biquadratic equation according to the following formula：
c0=γSR-γ0, (29a)
c1=2 η γ0|f|2-2γSR(1+η|f|2(1+γ0)), (29b)
c2=γSR(1+η|f|2(4+η|f|2(1+γ0))-η2γ0|f|4, (29c)
c3=-2 η γSR|f|2(1+η|f|2)(1+γ0), (29d)
c4=η2γSR|f|4(1+γ0). (29e)
γSRSignal to noise ratio for source node-via node interchannel
F is relaying loop interference channel
η is energy conversion efficiency；
Then according to following formula determines biquadratic equation：
Q2(ρ)=c4ρ4+c3ρ3+c2ρ2+c1ρ+c0.
Wherein, Q2(ρ) it is the biquadratic equation determining optimum power dividing ratio；
ρ is best power segregation ratio.
Described N5 is realized in：
Described biquadratic equation is solved by Descartes-Euler-Cardano method or Ferrari-Lagrange method
Obtain three roots needing below, then according to following formula determines power dividing ratio：
Compared with prior art, the invention has the beneficial effects as follows：The present invention proposes based in the full duplex of power dividing
Continue transceiver architecture, and transmits for wireless messages and the synchronous energy of full duplex relaying it is achieved that via node is from receiving
Source node RF signal collection energy, thus reduce via node power supply is powered or battery charge dependence；And pass through
Utilization to channel condition information, devises the power dividing ratio of optimization, carries out signal forwarding using the energy collecting, real
Show the full duplex relaying communication in whole transmission time slot, drastically increase the spectrum efficiency of wireless relay communication system.
Brief description
Fig. 1. full duplex relaying system structure diagram
Fig. 2. outage probability vs γLI
Fig. 3. outage probability vs SNR
Fig. 4. outage probability vs d1
Fig. 5. the step block diagram of the inventive method.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further detail：
Because PSR agreement has ratio TSR agreement more preferably systematic function, the present invention is directed to full duplex relaying network and carries out base
In power dividing SWIPT research it is proposed that the concrete methods of realizing of full duplex relaying SWIPT based on power dividing.In order to
The outage probability of system is made to minimize, the present invention has separately designed and has been based on complete channel state information (Channel State
Information, CSI) and the power dividing method based on part CSI；To both power dividing methods, give biquadratic
The power dividing ratio of journey analytic solutions form；When determining power dividing ratio, the power dividing method based on part CSI need not
The CSI of the second hop link, significantly reduces CSI and estimates and feedback overhead.Simulation result shows, the carried power dividing of the present invention
Method achieves the interruption performance better than constant power shunt method.Additionally, when via node is located at source node and destination node
Centre position when, the interruption performance of system is worst.And the power dividing method based on impaction of partial channel state information is in relaying section
The interruption performance consistent with the power dividing method based on complete channel state information is achieved during the close destination node of point.
The present invention proposes a kind of wireless messages based on power dividing and energy full duplex synchronization transfer method.By adopting
With the relay transceiver framework of power dividing, via node is from the source node RF signal collection energy receiving it is achieved that wireless
Full duplex information relays.Outage probability for making system minimizes, and the method is according to complete channel state information and local channel
Status information dynamically optimizes power dividing ratio.In the case of there is the interference of strong loop, based on complete and local channel
The power dividing method of status information all achieves the interruption performance better than constant power shunt method, and is based on local channel shape
The power dividing method of state information need not the second hop link channel condition information.Test result indicate that, positioned at source node and mesh
The via node in node centre position achieve worst interruption performance, and the power dividing based on impaction of partial channel state information
Method achieves consistent with the power dividing method based on complete channel state information when via node is near destination node
Interruption performance.
Full duplex relaying network as shown in Figure 1, one of source node expectation sends its information to a destination node.
Because the distance between source node and destination node have the factors such as barrier farther out or between the two, system is based on using one
AF strategy full duplex relaying node come to enter row information relaying.Within the system, source node and destination node are respectively configured Dan Tian
Line, and via node is configured with a reception antenna and a transmitting antenna.It is assumed that via node carries out the initial of transmitting-receiving process
Energy is provided by the battery that via node configures, and via node must gather enough energy from the radiofrequency signal receiving, from
And support complete information relay processes.The channel of source node to via node and via node to destination node is designated as respectively
H and g, the loop interference channel of via node itself is designated as f.It is assumed that all channels meet quasistatic Rayleigh fading, then channel
Gain | h |2, | g |2With | f |2Meet exponential, its average can be designated as λ respectivelyh, λgWith λ x.By using based on request send/
Allow to send the channel estimation methods of (request-to-send/clear-to-send, RTS/CTS), CSI can be used for SWIPT
Realization.Current invention assumes that via node has the ability obtaining complete CSI or part CSI, power dividing ratio can be in relaying
Node is calculated and is updated.
In each transmission block, ρ: 1- ρ is divided into two parts to the signal that via node receives to the inventive method in proportion, its
Middle ρ (0 ＜ ρ ＜ 1) is power dividing ratio.In the present invention, via node works in a full-duplex mode, and via node is same
Frequency band receipt signal y simultaneouslyr(t) and transmission signal xrT (), it is sent into the signal of EH receiver and is represented by
Wherein, s (t) is source node sending signal, PsIt is source node transmission power, d1It is between source node and via node
Distance, m is path attenuation index.Via node collection energy be
WhereinIt is via node transmission power, T is the duration of each transmission block, η (0 ＜ η ＜
1) it is energy conversion efficiency coefficient, this coefficient depends on rectification and energy acquisition circuit [9].In via node, baseband sampling is believed
Number can be designated as
Wherein, k is symbolic label, and s (k) is the sampled signal of s (t), xrK () is xrThe sampled signal of (t), nrK () is equal
Value is zero contrast is σ2Additive white Gaussian noise (additive white Gaussian noises, AWGN).In formula (3)
In, on the right of equal sign, Section 2 is the loop interference of via node., using the energy collected, via node is to it for the inventive method
Receipt signal is amplified and forwards, and its forward signal is represented by
Wherein, β is trunking gain, and τ >=1 is that the process of via node postpones.By being iterated to formula (3) and formula (4)
Replace, the transmission signal of via node can be expressed as
The baseband signal that destination node receives is represented by
Wherein d2It is the distance from via node to destination node, nd(k) be average be zero variance be σ2AWGN.By formula
(5) substitute into formula (6), can get
To receiving signal ydK (), destination node can be detected to s (k- τ) using either standard detection program, then go up
In formula the 2nd and the 3rd is unexpected interference and noise.
SINR is specific as follows end to end：
The present invention is according to non-runout condition derivation relay transmission signal power end to end.Assume all signals and noise phase
Mutually independent, the transmission power of via nodeCan be expressed as according to formula (5)
For preventing via node from runout occurring and ensureing limited repeat transmitted power, trunking gain meets
Collect ENERGY E in via nodehIn the case of, maximum repeat transmitted power is represented by
Actual repeat transmitted power should be less than or is equal to maximum repeat transmitted power, that is,
Pr≤Pmax. (11)
Formula (8) is substituted into formula (11) with formula (10) by the present invention, and the trunking gain under maximum repeat transmitted power constraint is full
Foot
The signal noise ratio (signal-to-noise ratio, SNR) of the wherein first hop channel is defined asAdditionally, met the non-runout condition of formula (9) by formula proposed by the present invention (12).In signal and noise phase
Mutually under independent hypothesis, the received signal power of destination node can be expressed as by the present invention according to formula (6)The present invention can be further represented as expecting according to formula (5)
Signal, loop interference signal and noise sum, that is,:
According to formula (13), in the system of present invention work, Signal Interference and Noise Ratio (signal-to- end to end
Interference-plus-noise-ratio, SINR) it is represented by
The signal to noise ratio of the wherein second hop channel is defined as
In the present invention, the power dividing method based on complete CSI is as follows：
It is assumed that via node can obtain complete CSI, the present invention is designed to based on the power dividing of complete CSI.Foundation
Formula (13) and (14), same β and ρ of end-to-end SINR has extremely complex non-linear relation.To relaying control parameter design mesh
Mark is so that outage probability is minimized by parameters optimization { β, ρ }.In the case of complete CSI is available, this design object etc.
It is same as so that SINR end to end is maximized, thus the relay and control parameter { β optimizing*, ρ*Can be obtained by solving problems with：
Understand, γ is not the joint convex function of β and ρ by γ is directed to the Hessian matrix analyses of parameter { β, ρ }, this
Solving-optimizing parameter { the β making*, ρ*Become abnormal difficult.Generally, can using traversal all possible { β, ρ } is combined into
Line search.
According to the maximum transmission power of relaying, trunking gain is set to the maximum of maximum transmission power permission by the present invention
Value, that is, adopt maximum trunking gain method.To given any ρ (0 ＜ ρ ＜ 1), the energy of relaying collection and maximum transmission power
It is all the numerical value determining, then trunking gain may be configured as
Formula (16) is substituted into formula (14), end-to-end SINR can be expressed as
WhereinBy above formula, the maximization problems of end-to-end SINR can be converted into the optimization to ρ.Logical
Cross using maximum trunking gain method, can verify and provide, by formula (17), the convex function that γ becomes ρ.Therefore, it can by asking
SolutionTo obtain the optimized power shunting ratio making end-to-end SINR maximum.By analysis, equationPermissible
It is reduced to Q1(ρ)=0, wherein
It is a biquadratic equation with canonical form, its each term coefficient is
a0=1+ γSR,
a1=-2 (1+ η | f |2)(1+γSR),
a2=γSR-ηγRD+η2|f|4(1+γSR)+η|f|2(5+γSR(4-ηγRD)),
a3=-2 η | f |2(γSR+η|f|2(2+γSR)-η(1+γSR)γRD),
a4=η2|f|2(η|f|2+γSR)(|f|2-γRD). (19)
To the biquadratic equation with canonical form shown in formula (18), Descartes-Euler-Cardano method can be passed through
Or Ferrari-Lagrange method obtains analytic solutions and (refer to S.Neumark, Solution of Cubic and
Quartic Equations.Oxford, NY：Pergamon Press, 1965).In view of constraints 0 ＜ ρ ＜ 1, optimization
Power dividing ratio is given by：
As shown in figure 5, during power dividing method based on complete channel state information in the embodiment of this invention, by following
Step is carried out：
Step 1：Source node sending signal
Step 2：Via node receipt signal
Step 3：Using channel estimation methods, that is, it is based on request to send/allowed to send (request-to-send/clear-
To-send, RTS/CTS) channel estimation methods, obtain complete channel state information.
Step 4：Calculate the coefficient of biquadratic equation by formula (19).
Step 5：Determine biquadratic equation by formula (18).
Step 6：The biquadratic equation of solution formula (18) simultaneously determines power dividing ratio ρ by formula (20).
Step 7：Ratio ρ that via node is given by step 6 to receipt signal: (1- ρ) carries out power dividing
Step 8：The energy acquisition machine of via node carries out energy acquisition, and signal processor carries out base band signal process, and
Energy using collection carries out signal amplification and forwarding.
Step 9：The signal that destination node reception is sent by via node.
Power dividing method based on part CSI is specific as follows：
CSI due to the second hop channel can only be estimated in destination node, the feedback overhead limit to the second hop channel CSI
Make the application of the power dividing method based on complete channel CSI.In view of this, the present invention is also based on part CSI, that is, in supposing
The node that continues can only obtain the first hop channel and the CSI of relaying loop channel, is optimized design to power dividing ratio.In part
Under conditions of CSI, the optimization problem of power dividing ratio is to find one to make the minimum power dividing ratio of condition break-point probability,
I.e.：
Wherein γ0It is desired target SINR of system.
Equation (17) is substituted into Pout=Pr (γ ＜ γ0| h, f), then condition break-point probability is represented by
Wherein, G1(ρ)=a | h |2+ b, G2(ρ)=c | h |4+d|h|2And have
Due to | g |2It is consistently greater than a negative, whenP during for negative, in formula (22)outBecome 1.Therefore, pass through
ObserveSign and consider to constrain 0 ＜ ρ ＜ 1 and 0 ＜ η ＜ 1, PoutCan be reduced to
Wherein,
In formula (24), work as PoutWhen=1, can ρ=1 be set, so that relaying collecting energy as much as possible.WhenThe design object of system is to find the condition break-point probability of optimization.By 0 ＜ ρ ＜ 1
Substitute into F1And H1, CSI constraint { | f |2＜ F1and|h|2＞ H1Can be expressed as
ρ ＜ ρ1And C1, (25)
Wherein,
C1RepresentWhen CSI meet the constraint C1When it should in interval Ω1=ρ | 0 ＜ ρ
＜ ρ1In look for the power dividing ratio of optimization.When CSI meet the constraint
OrWhen it should in interval Ω2=ρ | ρ1＜ ρ ＜ 1 } orIn look for the power optimization ratio of optimization.Based on this sight
Examine, when CSI meet the constraint CiWhen (i=1,2,3), the outage probability of condition may be calculated
Due to makingMinimum is equal to be madeMaximize, then optimize
Power dividing ratio can obtain from following optimization problem：
In view of G (ρ) in interval CiIt is convex function in (i=1,2,3), optimize solution and can pass through solving equationObtain.Due toThere is extremely complex expression, the closed form optimizing solution is difficult to obtain
?.However, G (ρ) has the approximate value under the conditions of high SINRTherefore can be by solvingOptimize solution to obtain.Through mathematical operation, the power dividing ratio of optimization is given by：
Wherein, Q2(ρ)=c4ρ4+c3ρ3+c2ρ2+c1ρ+c0It is a biquadratic equation and have
c0=γSR- γ 0, (29a)
c1=2 η γ0|f|2-2γSR(1+η|f|2(1+γ0)), (29b)
c2=γSR(1+η|f|2(4+η|f|2(1+γ0))-η2γ0|f|4, (29c)
c3=-2 η γSR|f|2(1+η|f|2)(1+γ0), (29d)
c4=η2γSR|f|4(1+γ0). (29e)
During the power dividing ratio computationally stated, relaying needs to know h and f.By using the channel based on RTS/CTS
Method of estimation, before being transmitted, system can determine that power dividing ratio.
During power dividing method based on impaction of partial channel state information in the embodiment of this invention, carry out according to the following steps：
Step 1：Source node sending signal
Step 2：Via node receipt signal
Step 3：Obtain impaction of partial channel state information using channel estimation methods.
Step 4：Calculate the coefficient of biquadratic equation by formula (29) and determine biquadratic equation.
Step 5：Biquadratic equation that solution procedure 4 is given simultaneously determines power dividing ratio by formula (28).
Step 6：Via node carries out power dividing to receipt signal by the ratio that step 5 provides
Step 7：The energy acquisition machine of the node of relaying carries out energy acquisition, and signal processor carries out base band signal process,
And carry out signal amplification and forwarding using the energy of collection.
Step 8：The signal that destination node reception is sent by via node.
The effect of the present invention to be described below by experimental result：
By experimental result, power dividing method proposed by the invention is verified.In an experiment, the biography of source node
Defeated speed is R=3bps/Hz, leads to the end-to-end SINR thresholding interrupting occurring to be set to γ0=2R- 1, the energy of via node
Collecting efficiency is set to η=0.4.The mean set of channel gain is λh=λg=1, the average interference noise of loop interference channel
It is set as than (INR)The path loss factor of channel is set to m=3.The transmitting signal to noise ratio (SNR) of source node is fixed
Justice isIn an experiment, carried power dividing method and the constant power shunt method of document [3] are carried out
Contrast.
Fig. 2 gives the curve chart that outage probability changes with INR.In fig. 2, the transmission power of source node is 35dB.?
In actual full duplex relaying system, because via node is disturbed by extremely strong loop, its systematic function will greatly reduce.
From Fig. 2 it can be seen that, constant power shunts the outage probability of ratio approach in the very fast rising in high INR region, proposed by the invention
The interruption performance more excellent compared with constant power shunt method is achieved based on the power dividing method of complete CSI and part CSI.In figure
In 2, when outage probability is in 10-1During level, obtained based on the method that the power dividing method of complete CSI compares fixing ρ=0.7
The INR gain of about 5.5dB, the method comparing fixing ρ=0.5 achieves the INR gain of about 4.5dB, compares ρ=0.3
Method achieve the INR gain of about 3.5dB.In low INR scope be better than although being achieved based on the method for complete CSI
Based on the interruption performance of part CSI method, the gap between the two interruption performance is less.This shows to estimate in the less CSI of demand
The method based on part CSI of meter expense, can be close to the interruption performance of the method based on complete CSI.
Fig. 3 gives the curve that outage probability launches SNR change with source node.In an experiment, setting loop interference INR is
γLI=40dB.From figure 3, it can be seen that proposed by the invention achieves best interruption based on the power dividing method of complete CSI
Performance.For example, it is in 10 in outage probability-2The side of fixing ρ=0.7 during level, is compared based on the power dividing method of complete CSI
Method achieves the SNR gain of about 4.5dB, and the method comparing fixing ρ=0.5 achieves the SNR gain of 3dB, compares ρ=0.3
Method achieve the SNR gain of 1.8dB.When source node transmitting SNR becomes very high, power dividing side proposed by the invention
Interruption performance gap between method and constant power shunt method is reduced to a more stable less difference.Additionally, the portion of being based on
The power dividing method dividing CSI achieves the interruption performance closely with the method based on complete CSI.Due to based on part
The method of CSI need not the second hop link CSI, thus the method is more suitable for the system less with overhead.
Fig. 4 gives the curve that outage probability changes with intermediate position.In an experiment, SNR=45dB, γ are setLI=
35dB, d1+d2=2 and d1Change to 0.9 from 0.1.As shown in figure 4, the outage probability of maximum occurs in d1At=1.Therefore, in
The node that continues should be disposed close to the position of source node or destination node, thus reducing outage probability.In the diagram, institute of the present invention
Carry achieves optimal interruption performance based on the power dividing method of complete CSI.When via node is placed near destination node
When, achieved and the interruption performance almost consistent based on complete CSI method based on the power dividing method of part CSI.Cause this
The reason phenomenon, is：To the power dividing method based on part CSI, end to end SINR depend primarily on collection energy and
Loop is disturbed；When via node is away from source node, the power dividing method based on CSI is done only in accordance with the first hop channel and loop
Disturb the CSI of channel to calculate power dividing ratio.This test result indicate that：Power dividing method based on part CSI is more suitable
Together in the position being positioned over via node near destination node.
The wireless messages that the present invention is directed in full duplex relaying network and synchronous energy transmission are it is proposed that be based on complete CSI
With the power dividing method based on part CSI.Both power dividing methods are in the case of there is strong loop interference, right
Power dividing ratio optimizes, so that the outage probability of system minimizes.Test result indicate that, two kinds of power proposed by the present invention
Shunt method achieves and shunts the more excellent interruption performance of ratio approach than constant power.In the situation only needing less overhead
Under, based on the power dividing method of part CSI can obtain close to the interruption performance based on complete CSI method.To invented
Both power dividing methods, when via node is positioned at the centre position of source node and destination node, system obtains worst
Interruption performance.To the power dividing method based on part CSI, when via node is near destination node, can obtain and be based on
The almost consistent interruption performance of CSI method completely.
Technique scheme is one embodiment of the present invention, for those skilled in the art, at this
On the basis of disclosure of the invention application process and principle it is easy to make various types of improve or deform, be not limited solely to this
Invent the method described by above-mentioned specific embodiment, therefore previously described mode simply preferably, and does not have restriction
The meaning of property.
Claims (10)
1. a kind of power dividing method that full duplex relaying wireless messages are transmitted with synchronous energy, for full duplex relaying network,
It is characterized in that：Using the relay transceiver framework of power dividing, full duplex relaying node is believed from the radio frequency of the source node receiving
Collecting energy in number, realizes wireless full-duplex information relaying；
Power dividing based on full detail status information：Using the status information of the first jump, the second jump and relaying loop channel,
Criterion is maximized by end-to-end SINR or the outage probability of system minimizes the power dividing ratio determination that criterion determines optimum
Optimum power dividing ratio；
Or the power dividing based on partial information status information：Jump and relay the status information of loop channel using first, lead to
The power dividing ratio crossing the outage probability minimum criterion determination optimum that end-to-end SINR maximizes criterion or system determines
Excellent power dividing ratio.
2. the power dividing method that full duplex relaying wireless messages according to claim 1 are transmitted with synchronous energy, it is special
Levy and be：Described full duplex relaying network includes source node, destination node and full duplex relaying node；
Described source node and destination node are each configured with single antenna；Described full duplex relaying node is configured with reception antenna and sends out
Penetrate antenna；
The primary power of described full duplex relaying node is provided by the battery that it configures, and full duplex relaying node is from penetrating of receiving
Collecting energy in frequency signal, completes information relay processes.
3. the power dividing method that full duplex relaying wireless messages according to claim 2 are transmitted with synchronous energy, it is special
Levy and be：Described full duplex relaying node is using the full duplex relaying node based on AF strategy.
It is provided with energy acquisition machine and baseband signal processor, from the radiofrequency signal of source node on described full duplex relaying node
A part is admitted to energy acquisition machine, and another part is admitted to baseband signal processor.
4. the power dividing method that full duplex relaying wireless messages according to claim 3 are transmitted with synchronous energy, it is special
Levy and be：Described it is realized in based on the power dividing of full detail status information：
It is assumed that via node can obtain complete CSI,
S1：Source node sending signal；
S2：Full duplex relaying node receipt signal；
S3：Obtain complete channel state information using channel estimation methods；
S4：Calculate the coefficient of biquadratic equation；
S5：Determine biquadratic equation；
S6：Solve biquadratic equation and determine power dividing ratio ρ；
S7：Full duplex relaying node is to the radiofrequency signal receiving by ρ：(1- ρ) carries out power dividing；
S8：The energy acquisition machine of full duplex relaying node carries out energy acquisition, and baseband signal processor carries out base band signal process,
And carry out signal amplification and forwarding using the energy of collection；
S9：The signal that destination node reception is sent by full duplex relaying node.
5. the power dividing method that full duplex relaying wireless messages according to claim 4 are transmitted with synchronous energy, it is special
Levy and be：Described S4 is realized in：
Calculate the coefficient of biquadratic equation according to the following formula：
a0=1+ γSR,
a1=-2 (1+ η | f |2)(1+γSR),
a2=γSR-ηγRID+η2|f|4(1+γSR)
+η|f|2(5+γSR(4-ηγRD)),
a3=-2 η | f |2(γSR+η|f|2(2+γSR)-η(1+γSR)γRID),
a4=η2|f|2(η|f|2+γSR)(|f|2-γRD).
Wherein,
γSRSignal to noise ratio for source node-via node interchannel
γRDSignal to noise ratio for via node-destination node interchannel
F is relaying loop interference channel
η is energy conversion efficiency.
6. the power dividing method that full duplex relaying wireless messages according to claim 5 are transmitted with synchronous energy, it is special
Levy and be：Described S5 is realized in：
Determine biquadratic equation according to the following formula：
Wherein, Q1(ρ)For determining the biquadratic equation of optimum power dividing ratio；
a1, a2, a3, a4, for calculating the biquadratic equation coefficient determining,
ρ is best power segregation ratio.
7. the power dividing method that full duplex relaying wireless messages according to claim 6 are transmitted with synchronous energy, it is special
Levy and be：Described S6 is realized in：
Obtain the parsing of biquadratic equation by Descartes-Euler-Cardano method or Ferrari-Lagrange method
Solution, then determines power dividing ratio by following formula：
Wherein, γRDSignal to noise ratio for via node-destination node interchannel
F is relaying loop interference channel.
8. the power dividing method that full duplex relaying wireless messages according to claim 3 are transmitted with synchronous energy, it is special
Levy and be：Described it is realized in based on the power dividing of partial information status information：
It is assumed that via node can only obtain the first hop channel and the CSI of relaying loop channel,
N1：Source node sending signal；
N2：Full duplex relaying node receipt signal；
N3：Obtain impaction of partial channel state information using channel estimation methods；
N4：；Calculate the coefficient of biquadratic equation and determine biquadratic equation；
N5：Solve biquadratic equation and determine power dividing ratio ρ；
N6：Full duplex relaying node presses ρ to receipt signal：(1- ρ) carries out power dividing；
N7：The energy acquisition machine of full duplex relaying node carries out energy acquisition, and baseband signal processor carries out base band signal process,
And carry out signal amplification and forwarding using the energy of collection；
N8：The signal that destination node reception is sent by via node.
9. the power dividing method that full duplex relaying wireless messages according to claim 8 are transmitted with synchronous energy, it is special
Levy and be：Described N4 is realized in：
Calculate the coefficient of biquadratic equation according to the following formula：
c0=γSR-γ0, (29a)
c1=2 η γ0|f|2-2γSR(1+η|f|2(1+γ0)), (29b)
c2=γSR(1+η|f|2(4+η|f|2(1+γ0))-η2γ0|f|4(29c)
c3=-2 η γSR|f|2(1+η|f|2)(1+γ0), (29d)
c4=η2γSR|f|4(1+γ0). (29e)
γSRSignal to noise ratio for source node-via node interchannel
F is relaying loop interference channel
η is energy conversion efficiency；
Then according to following formula determines biquadratic equation：
Q2(ρ)=c4ρ4+c3ρ3+c2ρ2+c1ρ+c0.
Wherein, Q2(ρ) it is the biquadratic equation determining optimum power dividing ratio；
ρ is best power segregation ratio.
10. the power dividing method that full duplex relaying wireless messages according to claim 9 are transmitted with synchronous energy, it is special
Levy and be：Described N5 is realized in：
Determine power dividing ratio according to the following formula：
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