CN105072621B - A kind of implementation method of the timesharing communication for coordination based on OFDM cognition network - Google Patents
A kind of implementation method of the timesharing communication for coordination based on OFDM cognition network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
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Abstract
The invention discloses a kind of implementation method of timesharing communication for coordination based on OFDM cognition network, this method is to belong to wireless communication technology field for the OFDM cognition network with collection of energy function.In traditional frequency spectrum sharing method, secondary user is perhaps using band communication primary user unappropriated band communication or occupied under the premise of ensuring primary user's communication quality using primary user.And time user's transmitter can not only decode forwarding primary user's signal to promote primary user's information to transmit in this method, to obtain the chance more communicated using primary user's frequency spectrum, energy can also be collected from the part primary user's signal received, transmit energy supply for the relay transmission of main user information and the information of time user itself.By the above method, the present invention is solved using the thinking of Duality Decomposition, more quickly obtains middle time and the optimum allocation of power of communication for coordination scheme, under the premise of ensuring primary user's service quality, effectively improves the power system capacity of time user.
Description
Technical field
The present invention relates to a kind of implementation methods of timesharing communication for coordination based on OFDM cognition network, belong to wireless communication skill
Art field.
Background technique
The evolution and rapid development of mobile communication system make its mobile subscriber provide ubiquitous wireless access and high speed width
Band wireless transmission is possibly realized, but is increasingly increased energy demand.The energy consumption upgraded rapidly not only increases communication system
Operating cost, while also having caused serious environmental problem.Green communications technology, especially energy collection technology increasingly by
To the concern of academia and industry.The wherein energy collection technology of radio signal, so that equipment in wireless network can be with
The skyborne radio signal of unrestrained cloth is converted to electric energy to be used, extends its life cycle；And radio signal is wide
It is general to be applied in wireless communication.Therefore, while providing wireless data access and wireless energy for mobile terminal has very big reason
By and application value.
In traditional frequency spectrum sharing method, secondary user is perhaps using the unappropriated band communication of primary user or true
The band communication occupied under the premise of protecting primary user's communication quality using primary user.And time user transmitter is not in this method
But forwarding primary user's signal can be decoded to promote primary user's information to transmit, more communicated using primary user's frequency spectrum to obtain
Chance, moreover it is possible to collect energy from the part primary user's signal received, relay transmission and time user for main user information
The information of itself transmits energy supply.By the above method, the present invention is solved using the thinking of Duality Decomposition, is more quickly cooperateed with
The middle time of communication plan and the optimum allocation of power effectively improve secondary under the premise of ensuring primary user's service quality
The power system capacity of user.
Summary of the invention
Present invention aims at solving above-mentioned the deficiencies in the prior art, recognized for the OFDM with collection of energy function
Radio net proposes a kind of realization side of the timesharing communication for coordination of OFDM (that is: orthogonal frequency division multiplexi) cognition network
Method, this method support the dual cooperation of energy and information between primary and secondary user, are to be based on system energy efficiency and transmission performance most
The co-allocation of the bigization execution resources such as time and power.
Cognitive radio technology is a kind of effective way for improving the availability of frequency spectrum: the frequency band that secondary user monitors primary user makes
With situation, the unappropriated gap of authorization frequency spectrum of primary user is selected to communicate；Or secondary user uses undelay mode,
In the case where not influencing primary user's normal communication, time user is allowed to use the authorization frequency spectrum of primary user, and at this point, in order not to right
Primary user receiving end generates significant harmful interference, and the transmission power of secondary user's transmitting terminal suffers from limitation.Not with the above method
Together, secondary user's transmitting terminal can be used as cooperative relaying decoding forwarding primary user's signal, and primary user's information is promoted to transmit and obtain more
The chance mostly communicated using primary user's frequency spectrum；Time user's transmitting terminal can also be from the part primary user's signal received simultaneously
Energy is collected, the information for cooperative relaying transmission and time user itself transmits energy supply.
The technical scheme adopted by the invention to solve the technical problem is that: a kind of timesharing collaboration based on OFDM cognition network
The implementation method of communication, this method comprises the following steps:
Step 1: transmitting stage (that is: time slot τ in energy cooperation1,k), primary user's transmitting terminal PT passes through k-th of subcarrier, with
Power pp1,kTo primary user receiving end PUkWith secondary user's transmitting terminal STkBroadcast message xp1,k.Primary user receiving end PUkWith secondary user
Transmitting terminal STkReception signal be respectivelyWithIn this rank
Section, primary user receiving end PUkReception signal rate beAt the same time,
Received signal is converted to electric energy by secondary user's transmitting terminal, i.e.,
Step 2: being transmitted the stage in Cooperative For Information, secondary user's transmitting terminal is as relaying, with the decoding of semiduplex working method
Forward the signal of primary user's transmitting terminal.Specifically, in time slot τ21,k, primary user's transmitting terminal PT is by k-th of subcarrier, with power
pp2,kTo primary user receiving end PUkWith secondary user's transmitting terminal STkEmit signal xp2,k.Primary user receiving end PUkIt is sent with secondary user
Hold STkReception signal be respectivelyWithCorresponding letter
Number rate is respectivelyWith
In next time slot τ22,k, secondary user's transmitting terminal STkBy k-th of subcarrier, with power ps1,kIt is connect to primary user
Receiving end PUkDecoding forwarding xp2,k, primary user's transmitting terminal PT keeps idle state at this time.In this time slot, primary user receiving end PUk's
Receiving signal isSignal rate is accordinglyTherefore, the reachable signal rate in this cooperation stage primary user receiving end is
Step 3: individually transmitting stage τ in secondary user information3, it may be assumed that after guaranteeing that primary user's achievable rate requires, secondary user's hair
Sending end STkBy k-th of subcarrier, with power ps2,kSignal x is sent to secondary user receiving end SUs,k, primary user's transmitting terminal at this time
PT keeps idle state.It is in the reception signal in this stage, secondary user receiving end SUAccordingly may be used
It is up to rateAccording to constraint condition, keep time user's achievable rate maximumlly optimal
Resource allocation policy (τ3,ps2,k), it can be obtained by solving following formula, it may be assumed that
Step 4: above-mentioned non-convex problem being converted, p ' is enabledp1,k=pp1,kτ1,k, p 'p2,k=pp2,kτ21,k, p 's1,k=
ps1,kτ22,kWith p 's2,k=ps2,kτ3,k。Rp1,k(τ1,k,pp1,k),
Rs,k(τ3,k,ps2,k) can be expressed as about (τk Concave function, i.e., WithTo,
Non- convex problem is rewritten as convex problem.Its prove specific derivation process include:
Following form is all had by observing above-mentioned function,Wherein (x, t) be independent variable, α >=
0 is constant.Its Hessian matrix are as follows:
To given any reality vector z=[z1,z2], have
I.e.For negative semidefinite matrix, f (x, t) is the concave function about (x, t).Similarly, R can be provedp1,k
(τ1,k,p′p1,k),WithFor the convex of corresponding independent variable
Function.
Step 5: applying dual decomposition method, introduce dual variable for each constraint condition in above-mentioned convex problemAnd its Lagrangian L (s), entire problem can be disassembled into k subproblem Lk(sk,pk,τk),
That is:
In internal layer, fixed dual variable sk, to each Lagrangian Lk(sk,pk,τk) Parallel application KKT condition, it obtains
To the optimal value of corresponding former independent variableIn outer layer, each former independent variable is collected, is optimized according to subgradient algorithm whole
Body updates dual variable, i.e., For the lesser step-length of value.It iterates, until making the two simultaneously
It is optimal.Specifically, for internal layer iteration, by former independent variable (τk,p′k) it is divided into τkWith p 'kTwo groups of alternative optimizations.It is wherein solid
Determine τk, various can advanced optimize to obtain p ' by followingk；
Wherein ak=log (2) (γ+κk)αkβk,
bk=log (2) (γ+κk)(αk+βk)-(γ+κk)αkβk,ck=log (2) (γ+κk)-(λkβk+μkαk),
Then p ' is fixedk, various can advanced optimize to obtain τ by followingk, successively；Optimization reaches most simultaneously until the two
It is excellent, it may be assumed that
Step 4 of the present invention includes: to proveAnd Rs,k(τ3,k,p′s2,k) it is the specific of convex function
Derivation process are as follows:
Following form is all had by observing above-mentioned function,
Wherein (x, t) is independent variable, and α >=0 is constant, and Hessian matrix is
To given any reality vector z=[z1,z2], have
I.e.For negative semidefinite matrix, f (x, t) is the concave function about (x, t)；Similarly, R can be provedp1,k
(τ1,k,p′p1,k),And Rs,k(τ3,k,p′s2,k) it is corresponding independent variable
Convex function.
It include: for internal layer iteration, by former independent variable (τ in step 5 of the present inventionk,p′k) it is divided into τkWith p 'kTwo groups
Alternative optimization, wherein fixed τk, various advanced optimize to obtain p ' by followingk, i.e.,；
Wherein ak=log (2) (γ+κk)αkβk,
bk=log (2) (γ+κk)(αk+βk)-(γ+κk)αkβk,ck=log (2) (γ+κk)-(λkβk+μkαk),
Then p ' is fixedk, various can advanced optimize to obtain τ by followingk, successively optimize until the two while reaching most
It is excellent, it may be assumed that
The present invention is applied in the cooperation transmission mode between the primary and secondary user under wireless messages and synchronous energy transmission scene,
Effectively improve the handling capacity of communication system and the efficiency of system.
The utility model has the advantages that
1, the present invention is by introducing time user as cooperating relay, effectively improving system transfer rate and expanding covering
Area has bright prospects in terms of the transmission performance for improving wireless communication system.
2, the present invention transmits scene for wireless messages and synchronous energy, passes through wireless messages and energy between introducing primary and secondary user
The dual cooperation transmission mode of amount, effectively improves the energy efficiency of wireless communication system.
Detailed description of the invention
Fig. 1 is the system block diagram of the OFDM cognition network in the embodiment of the present invention with collection of energy.
Fig. 2 is the schematic diagram of timesharing communication for coordination scheme between multiple primary and secondary users in OFDM cognition network.
Fig. 3 is the resource allocation process based on convex optimization in primary and secondary synergic user communication scheme in OFDM cognition network
Figure.
Specific embodiment
The invention is described in further detail with reference to the accompanying drawings of the specification.
As shown in Figure 1, including primary user's transmitting terminal PT, K primary user receiving ends PU, K user's hairs in network
Sending end ST, one customer objective receiving end SU.All primary and secondary users are single antenna.Wherein primary user's transmitting terminal PT and time
Customer objective receiving end SU sends and receives signal in K sub-carrier channels respectively；And primary user receiving end PUkIt is sent out with secondary user
Sending end STkIt works in k-th of subcarrier, and secondary user's transmitting terminal STkIt can be to primary user receiving end PUkInformation is decoded
Forwarding and from receiving to collect energy in signal.Secondary user sends STkAfter assisting primary user's transmitting terminal PT to complete communication, occupy each
Subcarrier transmits time user's self information to secondary user receiving end SU.
Step 1: transmitting stage (that is: time slot τ in energy cooperation1,k), primary user's PT transmitting terminal passes through k-th of subcarrier, with
Power pp1,kTo primary user receiving end PUkWith secondary user's transmitting terminal STkBroadcast message xp1,k.Primary user receiving end PUkWith secondary user
Transmitting terminal STkReception signal be respectivelyWithIn this rank
Section, the reception signal rate of primary user receiving end areAt the same time, secondary
Received signal is converted to electric energy by user's transmitting terminal, i.e.,
Step 2: being transmitted the stage in Cooperative For Information, secondary user's transmitting terminal is as relaying, with the decoding of semiduplex working method
Forward the signal of primary user's transmitting terminal.Specifically, in time slot τ21,k, primary user's transmitting terminal is by k-th of subcarrier, with power
pp2,kTo primary user receiving end PUkWith secondary user's transmitting terminal STkEmit signal xp2,k.Primary user receiving end PUkIt is sent with secondary user
Hold STkReception signal be respectivelyWithCorresponding letter
Number rate is respectively
With
In next time slot τ22,k, secondary user's transmitting terminal STkBy k-th of subcarrier, with power ps1,kIt is connect to primary user
Receiving end PUkDecoding forwarding xp2,k, primary user's transmitting terminal keeps idle state at this time.In this time slot, primary user receiving end PUkConnect
It collects mail and number isSignal rate is accordinglyTherefore, the reachable signal rate in this cooperation stage primary user receiving end is
Step 3: individually transmitting stage τ in secondary user information3, it may be assumed that after guaranteeing that primary user's achievable rate requires, secondary user's hair
Sending end STkBy k-th of subcarrier, with power ps2,kSignal x is sent to secondary user receiving end SUs,k, primary user's transmitting terminal at this time
Keep idle state.It is in the reception signal in this stage, secondary user receiving end SUAccordingly may be used
It is up to rateAccording to constraint condition, make time user achievable rate maximumlly most
Excellent resource allocation policy (τ3,ps2,k), it can be obtained by solving following formula, it may be assumed that
Step 4: above-mentioned non-convex problem being converted, p ' is enabledp1,k=pp1,kτ1,k, p 'p2,k=pp2,kτ21,k, p 's1,k=
ps1,kτ22,kWith p 's2,k=ps2,kτ3,k。Rp1,k(τ1,k,pp1,k),
RS, k(τ3, k,pS2, k) can be expressed as about (τk Concave function, i.e., WithTo,
Non- convex problem is rewritten as convex problem.
Step 5: applying dual decomposition method, introduce dual variable for each constraint condition in above-mentioned convex problemAnd its Lagrangian L (s), entire problem can be disassembled into k subproblem Lk(sk,pk,τk),
Such as following formula.In internal layer, fixed dual variable sk, to each Lagrangian Lk(sk,pk,τk) Parallel application KKT condition, it obtains
The optimal value of corresponding original independent variableIn outer layer, each former independent variable is collected, is optimized according to subgradient algorithm whole
Dual variable is updated, i.e., For the lesser step-length of value.It iterates, until making the two while reaching
To optimal.
Specifically, for internal layer iteration, by former independent variable (τk,p′k) it is divided into τkWith p 'kTwo groups of alternative optimizations.Wherein fix
τk, various can advanced optimize to obtain p ' by followingk；
Wherein ak=log (2) (γ+κk)αkβk,
bk=log (2) (γ+κk)(αk+βk)-(γ+κk)αkβk,ck=log (2) (γ+κk)-(λkβk+μkαk),
Then p ' is fixedk, various can advanced optimize to obtain τ by followingk, successively；Optimization reaches most simultaneously until the two
It is excellent.
Finally, former independent variable (τ, p ') and dual variable s are optimal simultaneously, and thus calculate the reachable of time user and
Rate.
Further, in step 4 of the present invention, it was demonstrated that Rp1,k(τ1,k,p′p1,k), And Rs,k(τ3,k,p′s2,k) be convex function specific derivation process are as follows:
Following form is all had by observing above-mentioned function,
Wherein (x, t) is independent variable, and α >=0 is constant, and Hessian matrix is
To given any reality vector z=[z1,z2], have
I.e.For negative semidefinite matrix, f (x, t) is the concave function about (x, t)；Similarly, R can be provedp1,k
(τ1,k,p′p1,k),And Rs,k(τ3,k,p′s2,k) it is corresponding independent variable
Convex function.
Further, in step 5 of the present invention, for internal layer iteration, by former independent variable (τk,p′k) it is divided into τkWith
p′kTwo groups of alternative optimizations, wherein fixed τk, various advanced optimize to obtain p ' by followingk, i.e.,；
Wherein ak=log (2) (γ+κk)αkβk
bk=log (2) (γ+κk)(αk+βk)-(γ+κk)αkβk,ck=log (2) (γ+κk)-(λkβk+μkαk),
Then p ' is fixedk, various can advanced optimize to obtain τ by followingk, successively optimize until the two while reaching most
It is excellent；
Embodiments described herein are only preferred embodiment, and the not restriction of the scope of the present invention, Ren Heji
In improvement or equivalent replacement that spirit of that invention is done, as long as it does not depart from the spirit of the invention and range, should all cover at this
Within invention protection scope.
Claims (4)
1. a kind of implementation method of the timesharing communication for coordination based on OFDM cognition network, which is characterized in that the method includes with
Lower step:
Step 1: transmitting the stage in energy cooperation, it may be assumed that time slot τ1,k, primary user's transmitting terminal PT is by k-th of subcarrier, with power
pp1,kTo primary user receiving end PUkWith secondary user's transmitting terminal STkBroadcast message xp1,k；Primary user receiving end PUkIt is sent with secondary user
Hold STkReception signal be respectivelyWithIn this stage,
The reception signal rate of primary user receiving end isAt the same time, secondary user
Received signal is converted to electric energy by transmitting terminal, i.e.,
Step 2: being transmitted the stage in Cooperative For Information, secondary user's transmitting terminal is decoded with semiduplex working method and forwarded as relaying
The signal of primary user's transmitting terminal；In time slot τ21,k, primary user's transmitting terminal PT is by k-th of subcarrier, with power pp2,kTo primary user
Receiving end PUkWith secondary user's transmitting terminal STkEmit signal xp2,k；Primary user receiving end PUkWith secondary user's transmitting terminal STkReception letter
Number be respectivelyWithCorresponding signal rate difference
Are as follows:
With
In next time slot τ22,k, secondary user's transmitting terminal STkBy k-th of subcarrier, with power ps1,kTo primary user receiving end
PUkDecoding forwarding xp2,k, primary user's transmitting terminal PT keeps idle state at this time, in this time slot, primary user receiving end PUkReception
Signal isSignal rate is accordingly
Reachable signal rate in this cooperation stage primary user receiving end is
Step 3: individually transmitting stage τ in secondary user information3,k, it may be assumed that after guaranteeing that primary user's achievable rate requires, secondary user is sent
Hold STkBy k-th of subcarrier, with power ps2,kSignal x is sent to secondary user receiving end SUs,k, primary user's transmitting terminal PT at this time
Keep idle state；It is in the reception signal in this stage, secondary user receiving end SUIt is corresponding reachable
Rate isAccording to constraint condition, keep time user's achievable rate maximumlly optimal
Resource allocation policy (τ3,ps2,k), it is obtained by solving following formula:
Step 4: above-mentioned non-convex problem being converted, p ' is enabledp1,k=pp1,kτ1,k, p 'p2,k=pp2,kτ21,k, p 's1,k=ps1,k
τ22,kWith p 's2,k=ps2,kτ3,k, Rp1,k(τ1,k,pp1,k),Rs,k
(τ3,k,ps2,k) be expressed as about (τk p′kConcave function, it may be assumed that WithTo,
Non- convex problem is rewritten as convex problem；
Step 5: applying dual decomposition method, introduce dual variable for each constraint condition in above-mentioned convex problemAnd its Lagrangian L (s), entire problem is disassembled into k subproblem Lk(sk,pk,τk), it may be assumed that
In internal layer, fixed dual variable sk, to each Lagrangian Lk(sk,pk,τk) Parallel application KKT condition, it obtains pair
Answer the optimal value of former independent variableIn outer layer, each former independent variable is collected, it is whole more according to subgradient algorithm optimization
New dual variable, i.e., It for the lesser step-length of value, iterates, until making the two while reaching
It is optimal.
2. a kind of implementation method of timesharing communication for coordination based on OFDM cognition network according to claim 1, feature
It is, the step 4 includes: to prove Rp1,k(τ1,k,p′p1,k),
And Rs,k(τ3,k,p′s2,k) be convex function specific derivation process are as follows:
Following form is all had by observing above-mentioned function,
Wherein (x, t) is independent variable, and α >=0 is constant, and Hessian matrix is
To given any reality vector z=[z1,z2], have
I.e.For negative semidefinite matrix, f (x, t) is the concave function about (x, t)；Similarly, R can be provedp1,k(τ1,k,
p′p1,k),And Rs,k(τ3,k,p′s2,k) be corresponding independent variable convex letter
Number.
3. a kind of implementation method of timesharing communication for coordination based on OFDM cognition network according to claim 1, feature
It is, the step 5 includes: for internal layer iteration, by former independent variable (τk,p′k) it is divided into τkWith p 'kTwo groups of alternative optimizations, wherein
Fixed τk, various advanced optimize to obtain p ' by followingk, i.e.,；
Wherein ak=log (2) (γ+κk)αkβk,
bk=log (2) (γ+κk)(αk+βk)-(γ+κk)αkβk,ck=log (2) (γ+κk)-(λkβk+μkαk),
Then p ' is fixedk, various can advanced optimize to obtain τ by followingk, successively optimize until the two while being optimal,
That is:
4. a kind of implementation method of timesharing communication for coordination based on OFDM cognition network according to claim 1, feature
It is: in the cooperation transmission mode that the method is applied between the primary and secondary user under wireless messages and synchronous energy transmission scene.
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| CN106304112B (en) * | 2016-08-14 | 2019-09-03 | 正链科技(深圳)有限公司 | A kind of cellular network energy efficiency optimization method based on relay cooperative |
| CN106658528B (en) * | 2016-12-01 | 2023-08-25 | 广东技术师范学院 | Renewable energy source based cognitive wireless network cooperative transmission method and device |
| CN107332602B (en) * | 2017-06-20 | 2018-03-27 | 华中科技大学 | Full duplex relaying energy under the conditions of energy constraint reclaims communication means and system certainly |
| CN107707290A (en) * | 2017-10-11 | 2018-02-16 | 中山大学新华学院 | Based on two-channel trunking method |
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