CN106211305B - A kind of power distribution method in amplification forwarding bidirectional relay system - Google Patents
A kind of power distribution method in amplification forwarding bidirectional relay system Download PDFInfo
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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
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
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Abstract
The present invention relates to the power distribution methods in a kind of amplification forwarding bidirectional relay system, using the total frequency spectrum efficiency of bidirectional relay system as point of penetration, introduce total power constraint, it establishes system total frequency spectrum efficiency and maximizes model, a series of geometry optimizations are solved the problems, such as using successive approximation algorithm, find out optimal power parameterPromote the spectrum efficiency of amplification forwarding bidirectional relay system.
Description
Technical field
The present invention relates to the communications fields, and in particular to the power distribution method in a kind of amplification forwarding bidirectional relay system.
Background technique
Bidirectional relay system effectively extends net by the way that relay station is arranged between base station and user or user and user
The coverage area of network provides space diversity, and reduces the energy loss of system.Compared with one-way junction system, bi-directional relaying system
System can be improved spectrum efficiency by about one time, but there is also between user the problem of serious interference for the system.According to existing literature
Report, has had many methods that can eliminate the interference between user, such as dirty paper code and some interference coordination techniques.But this
A little methods algorithm complexity with higher, is unfavorable for implementing in systems in practice.At the same time, extensive antenna technology because
Its outstanding interference rejection capability obtains the extensive concern of industry.Therefore, relay dispose extensive antenna be it is a kind of very
Potential and simple and easy disturbance coordination method.
The bidirectional relay system channel for disposing extensive antenna is asymptotic orthogonal, the increase resolution of aerial array, Ke Yixian
The spectrum efficiency for the system that improves that lands.But with the growth of explosive mobile data flow, to the frequency spectrum of bidirectional relay system
More stringent requirements are proposed for efficiency.The method that the spectrum efficiency of bidirectional relay system is improved in existing literature, mainly has: (1) excellent
Change beamformer, the direction of the launch of control base station end wave beam；(2) day line options are carried out in relay, is transmitted with optimum channel
Data carry out user's scheduling, and the good user of scheduling channel condition transmits data；(3) channel transitory state information is utilized, it is real
When adjust the transmission power of user and relaying.
After analyzing existing method, inventor's discovery: the method or excessively complicated, feasibility being previously mentioned in document
Aspect is lacking or the scope of application is narrow, has certain limitation.Method (1) needs to obtain whole channel informations, into
The solution of row optimal beam former, it is relatively complicated, it is not easy to realize；Day line options or user, which dispatch, in method (2) needs
It introduces communication between relaying and user and coordinates, increase unnecessary expense；Need to detect channel change in method (3) in real time
Change, can not implement in channel variation faster high mobile system.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide the function in a kind of amplification forwarding bidirectional relay system
Rate distribution method promotes the spectrum efficiency of amplification forwarding bidirectional relay system.
The present invention solves technical solution provided by above-mentioned technical problem are as follows:
A kind of power distribution method in amplification forwarding bidirectional relay system, includes the following steps:
1) N is to user TA,iAnd TB,iIn the coherence time τ of each channelcIt is interior at the same send mutually orthogonal length be τp's
Pilot frequency sequence to relaying TR, wherein 1≤i≤N；The relaying TRIt is equipped with M root antenna；
2) T is relayedRN is received to user TA,iAnd TB,iAfter the pilot frequency sequence of transmission, MMSE is used according to pilot sequence information
Linear Estimation obtains channel state information；
3) user T is calculated according to channel state informationA,iSpectrum efficiency RA,iWith user TB,iSpectrum efficiency RB,i, total frequency
Spectrum efficiency
4) total frequency spectrum efficiency is converted toEstablish power optimization problem；Introduce power control
Algorithm carries out solving optimization problem, obtains that total frequency spectrum efficiency R is made to reach maximum power distribution parameterWithInstitute
State pA,iFor user TA,iTransmission power, pB,iFor user TB,iTransmission power, prTo relay TRTransmission power；
5) amplification forwarding bidirectional relay system utilizes optimal power distribution parameterWithCarry out data biography
It is defeated.
Above-mentioned technical proposal provides a kind of with directive significance for the power distribution in amplification forwarding bidirectional relay system
Method and calculate the expression formula of total frequency spectrum efficiency that is, by relaying estimation channel state information, obey general power in system
Under conditions of constraint, while optimizing relaying and N to the transmission power of user, so that the total frequency spectrum efficiency of system is maximum.Compared to
It is traditional such as beam forming or the method for the raising spectrum efficiency of day line options, have algorithm complexity low, simply easily implement
Feature has catered to the demand that the following explosive mobile data increases.
Channel state information in the step 2) includes user TA,iWith relaying TR, user TB,iWith relaying TRChannel shape
State information, specifically:
Wherein, gAR,iAnd gRB,iRespectively indicate user TA,i、TB,iWith relaying TRBetween channel vector,WithRespectively
Indicate user TA,i、TB,iWith relaying TRBetween estimation channel vector, eAR,iAnd eRB,iFor the evaluated error vector of channel.
The estimation channel vectorWithIn each element to meet mean value respectively be 0, variance isWithMultiple Gauss distribution, wherein βAR,iFor user TA,iWith relaying TRIt is big
Scale fading factor, βRB,iFor user TB,iWith relaying TRThe large-scale fading factor, ppFor the transmission power of pilot frequency sequence.
User T in the step 3)A,iSpectrum efficiency RA,iAre as follows:
In formula,
Wherein, ai,j, bi,j, ci,j, di,jAnd eiFor known definite value.
User T in the step 3)B,iSpectrum efficiency RB,iAre as follows:
In formula,
Wherein, WithIt is known
Definite value.
Power optimization problem is established in the step 4) are as follows:
maximize R
pA,i≥0,pB,i>=0, i=1 ..., N
pr≥0
Wherein, P is the total power constraint of amplification forwarding bidirectional relay system.
It is further, described to establish the transformation of power optimization problem equivalent are as follows:
pA,i≥0,pB,i>=0, i=1 ..., N
pr≥0
Above-mentioned power optimization problem is auxiliary geometric programming problem, successive approximation algorithm can be used, by solving a system
The geometric programming problem of column finds out the approximate solution of former problem.
Power control algorithm is successive approximation algorithm in the step 4), comprising:
A) it initializes: defined parameters ε and θ；K=1 is enabled, initial value is set
B) it iteration k: calculatesWith
Then following geometric programming is solved the problems, such as:
pA,i≥0,pB,i>=0, i=1 ..., N
pr≥0
Optimal solution when kth time iteration is obtained, is expressed asWith
C) iteration stopping criterion: ifOrIteration stopping, output
The solution of geometric programming problem at this time isWithOtherwise, step d) is executed；
D) it updates initial value: enablingAnd k=k+1；Execute step b).
Data transmission refers in the step 5): user TA,iAnd TB,iTransmission power is respectivelyWithSignal in
After TR；Relay TRAfter receiving signal, progress maximum-ratio combing/high specific transmission linear process, and withPower amplification turn
Issue user TA,iAnd TB,i, realize user TA,iAnd TB,iBetween communication.
Compared with the existing technology, the beneficial effects of the present invention are embodied in:
(1) present invention sufficiently combines bidirectional relay system and extensive antenna technology, and bi-directional relaying system is not only utilized
Area coverage of uniting is extensive, and the low advantage of energy loss is also equipped with the stronger interference coordination ability of extensive antenna.
(2) present invention obtains the expression formula of total frequency spectrum efficiency, using gradually for the channel state information of relay estimation
Approximate algorithm obtains user's allocation of parameters by solving the problems, such as a series of geometric programmingsSo that the frequency of system
Spectrum efficiency is maximum, meets the demand of future mobile communication system.
Detailed description of the invention
Fig. 1 is communication structure figure in amplification forwarding bidirectional relay system in the embodiment of the present invention；
Fig. 2 is the power distribution method flow chart of amplification forwarding bidirectional relay system in the embodiment of the present invention；
Fig. 3 is that the power distribution method in the embodiment of the present invention is bent compared with the spectrum efficiency of average power allocation method
Line.
Specific embodiment
Below with reference to embodiment and Figure of description, the present invention is further described.
Amplification forwarding bidirectional relay system as shown in Figure 1, the system include the relaying T for being equipped with M root antennaRAnd it works and is putting
Under the mode forwarded greatly, N is to single-antenna subscriber TA,iAnd TB,i；User TA,iAnd TB,iBy relaying TRRealize communication, all channels
Scattering it is abundant, meet Rayleigh fading model.
Power distribution method as shown in Figure 2, includes the following steps:
1) N is to user TA,iAnd TB,iIn the coherence time τ of each channelcIt is interior at the same send mutually orthogonal length be τp's
Pilot frequency sequence to relaying TR, wherein 1≤i≤N；The relaying TRIt is equipped with M root antenna；
2) T is relayedRN is received to user TA,iAnd TB,iAfter the pilot frequency sequence of transmission, MMSE is used according to pilot sequence information
Linear Estimation obtains channel state information；
3) user T is calculated according to channel state informationA,iSpectrum efficiency RA,iWith user TB,iSpectrum efficiency RB,i, total frequency
Spectrum efficiency
4) total frequency spectrum efficiency is converted toEstablish power optimization problem；Introduce power control
Algorithm carries out solving optimization problem, obtains that total frequency spectrum efficiency R is made to reach maximum power distribution parameterWithInstitute
State pA,iFor user TA,iTransmission power, pB,iFor user TB,iTransmission power, prTo relay TRTransmission power；
5) amplification forwarding bidirectional relay system utilizes optimal power distribution parameterWithCarry out data biography
It is defeated.
Channel state information in the step 2) includes user TA,iWith relaying TR, user TB,iWith relaying TRChannel shape
State information, specifically:
Wherein, gAR,iAnd gRB,iRespectively indicate user TA,i、TB,iWith relaying TRBetween channel vector,WithRespectively
Indicate user TA,i、TB,iWith relaying TRBetween estimation channel vector, eAR,iAnd eRB,iFor the evaluated error vector of channel.
The estimation channel vectorWithIn each element to meet mean value respectively be 0, variance isWithMultiple Gauss distribution, wherein βAR,iFor user TA,iWith relaying TRIt is big
Scale fading factor, βRB,iFor user TB,iWith relaying TRThe large-scale fading factor, ppFor the transmission power of pilot frequency sequence.
User T in the step 3)A,iSpectrum efficiency RA,iAre as follows:
In formula,
Wherein, ai,j, bi,j, ci,j, di,jAnd eiFor known definite value.
User T in the step 3)B,iSpectrum efficiency RB,iAre as follows:
In formula,
Wherein, WithIt is known
Definite value.
Power optimization problem is established in the step 4) are as follows:
maximize R
pA,i≥0,pB,i>=0, i=1 ..., N
pr≥0
Wherein, P is the total power constraint of amplification forwarding bidirectional relay system.
It is further, described to establish the transformation of power optimization problem equivalent are as follows:
pA,i≥0,pB,i>=0, i=1 ..., N
pr≥0
Above-mentioned power optimization problem is auxiliary geometric programming problem, successive approximation algorithm can be used, by solving a system
The geometric programming problem of column finds out the approximate solution of former problem.
Power control algorithm is successive approximation algorithm in the step 4), comprising:
A) it initializes: defined parameters ε and θ；K=1 is enabled, initial value is set
B) it iteration k: calculatesWith
Then following geometric programming is solved the problems, such as:
pA,i≥0,pB,i>=0, i=1 ..., N
pr≥0
Optimal solution when kth time iteration is obtained, is expressed asWith
C) iteration stopping criterion: ifOrIteration stopping, output
The solution of geometric programming problem at this time isWithOtherwise, step d) is executed；
D) it updates initial value: enablingAnd k=k+1；Execute step b).
Data transmission refers in the step 5): user TA,iAnd TB,iTransmission power is respectivelyWithSignal in
After TR；Relay TRAfter receiving signal, progress maximum-ratio combing/high specific transmission linear process, and withPower amplification forwarding
Give user TA,iAnd TB,i, realize user TA,iAnd TB,iBetween communication.
The technical effect that embodiment reaches are as follows:
Fig. 3 is the contrast effect figure of the successive approximation algorithm and average power allocation algorithm in the present embodiment.It is provided with
For random distribution N=5 to user, the large-scale fading factor is β in amplification forwarding bidirectional relay systemAR=[0.2688,0.0368,
] and β 0.00025,0.1398,0.0047RB=[0.0003,0.00025,0.0050,0.0794,0.0001], total power constraint
For P=10dB, it is p that pilot tone, which sends power,p=10dB.
It can be seen from the figure that optimal power allocation can effectively improve amplification compared with average power allocation scene
The spectrum efficiency of forward relay system, and trunking configuration gets over multiple antennas, promotes effect and is more obvious.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on are covered by the protection scope of the present invention.
Claims (5)
1. the power distribution method in a kind of amplification forwarding bidirectional relay system, which comprises the steps of:
1) N is to user TA,iAnd TB,iIn the coherence time τ of each channelcIt is interior at the same send mutually orthogonal length be τpPilot tone
Sequence to relaying TR, wherein 1≤i≤N；The relaying TRIt is equipped with M root antenna；
2) T is relayedRN is received to user TA,iAnd TB,iAfter the pilot frequency sequence of transmission, linearly estimated according to pilot sequence information using MMSE
Meter, obtains channel state information；
Channel state information in the step 2) includes user TA,iWith relaying TR, user TB,iWith relaying TRChannel status letter
Breath, specifically:
Wherein, gAR,iAnd gRB,iRespectively indicate user TA,i、TB,iWith relaying TRBetween channel vector,WithIt respectively indicates
User TA,i、TB,iWith relaying TRBetween estimation channel vector, eAR,iAnd eRB,iFor the evaluated error vector of channel；
The estimation channel vectorWithIn each element to meet mean value respectively be 0, variance is
WithMultiple Gauss distribution, wherein βAR,iFor user TA,iWith relaying TRThe large-scale fading factor, βRB,i
For user TB,iWith relaying TRThe large-scale fading factor, ppFor the transmission power of pilot frequency sequence；
3) user T is calculated according to channel state informationA,iSpectrum efficiency RA,iWith user TB,iSpectrum efficiency RB,i, total frequency spectrum effect
Rate
User T in the step 3)A,iSpectrum efficiency RA,iAre as follows:
In formula,
Wherein,
User T in the step 3)B,iSpectrum efficiency RB,iAre as follows:
In formula,
Wherein,
4) total frequency spectrum efficiency is converted toEstablish power optimization problem；Introduce power control algorithm
Solving optimization problem is carried out, obtains that total frequency spectrum efficiency R is made to reach maximum power distribution parameterWithThe pA,i
For user TA,iTransmission power, pB,iFor user TB,iTransmission power, prTo relay TRTransmission power；
5) amplification forwarding bidirectional relay system utilizes optimal power distribution parameterWithCarry out data transmission.
2. the power distribution method in amplification forwarding bidirectional relay system according to claim 1, which is characterized in that described
Power optimization problem is established in step 4) are as follows:
maximize R
pA,i≥0,pB,i>=0, i=1 ..., N
pr≥0
Wherein, P is the total power constraint of amplification forwarding bidirectional relay system.
3. the power distribution method in amplification forwarding bidirectional relay system according to claim 2, which is characterized in that described
Establish the transformation of power optimization problem equivalent are as follows:
pA,i≥0,pB,i>=0, i=1 ..., N
pr≥0。
4. the power distribution method in amplification forwarding bidirectional relay system according to claim 3, which is characterized in that described
Power control algorithm is successive approximation algorithm in step 4), comprising:
A) it initializes: defined parameters ε and θ；K=1 is enabled, initial value is set
B) it iteration k: calculatesWith
Then following geometric programming is solved the problems, such as:
pA,i≥0,pB,i>=0, i=1 ..., N
pr≥0
Optimal solution when kth time iteration is obtained, is expressed asWith
C) iteration stopping criterion: ifOrIteration stopping, output is at this time
The solution of geometric programming problem isWithOtherwise, step d) is executed；
D) it updates initial value: enablingAnd k=k+1；Execute step b).
5. the power distribution method in amplification forwarding bidirectional relay system according to claim 1, which is characterized in that described
Data transmission refers in step 5): user TA,iAnd TB,iTransmission power is respectivelyWithSignal to relaying TR；Relay TRIt receives
To after signal, progress maximum-ratio combing/high specific transmission linear process, and withPower amplification be transmitted to user TA,iWith
TB,i, realize user TA,iAnd TB,iBetween communication.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110020352A (en) * | 2009-08-24 | 2011-03-03 | 서울대학교산학협력단 | Apparatus and method of cooperative interference mitigation and resource management in wireless dual-hop relay systems with multiple antennas |
| JP2011250023A (en) * | 2010-05-25 | 2011-12-08 | Panasonic Electric Works Co Ltd | Wireless communication system |
| JP2012165275A (en) * | 2011-02-08 | 2012-08-30 | Nippon Telegr & Teleph Corp <Ntt> | Radio communication system, transceiver station, and relay station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110020352A (en) * | 2009-08-24 | 2011-03-03 | 서울대학교산학협력단 | Apparatus and method of cooperative interference mitigation and resource management in wireless dual-hop relay systems with multiple antennas |
| JP2011250023A (en) * | 2010-05-25 | 2011-12-08 | Panasonic Electric Works Co Ltd | Wireless communication system |
| JP2012165275A (en) * | 2011-02-08 | 2012-08-30 | Nippon Telegr & Teleph Corp <Ntt> | Radio communication system, transceiver station, and relay station |
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