CN108430040A - Federated user is grouped with power distribution method and uses the base station of the method - Google Patents
Federated user is grouped with power distribution method and uses the base station of the method Download PDFInfo
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- CN108430040A CN108430040A CN201710078557.0A CN201710078557A CN108430040A CN 108430040 A CN108430040 A CN 108430040A CN 201710078557 A CN201710078557 A CN 201710078557A CN 108430040 A CN108430040 A CN 108430040A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/08—User group management
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
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Abstract
The present invention provide a kind of grouping of federated user with power distribution method and using the method base station, be suitable for cooperative Non-orthogonal Multiple and access (non orthogonal multiple access；NOMA) system.The method of the present invention includes the following steps：User apparatus is ranked up according to K channel gain between base station and K user apparatus, and establishes strong user's candidate group comprising K/2 user apparatus and includes weak user's candidate group of K/2 user apparatus；Each in strong user's candidate group is matched with each in weak user's candidate group, and calculates the corresponding power partition coefficient of two user apparatus in each combinations of pairs simultaneously, which is distinguished into K/2 group；And according to the corresponding power partition coefficient of K/2 group, transmit a message to the K user apparatus.
Description
Technical field
The present invention relates to a kind of federated user grouping (USER CLUSTERING) and power distribution methods, and more particularly to
One kind being suitable for downlink cooperative Non-orthogonal Multiple and accesses (non-orthogonal multiple access；NOMA) system
Federated user grouping in system and power distribution method.
Background technology
Since Non-orthogonal Multiple accesses (non-orthogonal multiple access；NOMA) technology is in same band
Efficiency of transmission more higher than conventional orthogonal multiple access technique can be provided under resource, be considered as the 5th generation wireless communication system
One of multiple access candidate technologies.
In NOMA systems, user's multiplexing can carry out in the power domain of transmission end, then use company in receiving terminal
(successive interference cancellation are eliminated in continuous property interference；SIC) technology opens multi-user signal separation
Come.Specifically, it is assumed that the user apparatus with poor channel conditions is the weak user in system, and has preferable channel condition
User apparatus be system in strong user.In order to correctly demodulate the multi-purpose of base station transmission at each user apparatus end
Family signal, NOMA systems are the more transimission power of weak user configuration, so that strong user is can perform SIC technologies and decode itself
Signal.It is worth noting that, strong user can detect that base station is intended to send the signal of weak user to during executing SIC programs, therefore
It is existing that strong user is arranged to serve as the relay node technology between base station and weak user, to improve the signal receiving quality of weak user.
The communication system architecture of cooperative is mainly combined by this technology with NOMA technologies, therefore can be described as cooperative again
NOMA systems.However, presently relevant technology all assumes that the transimission power of the user apparatus in cooperative NOMA systems is to fix
, to simplify performance evaluation.
In addition to this, in order to which NOMA systems to be applied in actual environment, multi-user interference is also one of them
It needs to overcome the problems, such as.Although existing be distinguished into multiple groups to mitigate the technology of multi-user interference, at present by user apparatus
Still there has been no propose relevant user grouping algorithm for the user apparatus in cooperative NOMA systems.
Therefore, known cooperative NOMA systems can lifting system performance in the case of, how in systems by multiple use
Family device is appropriate to be divided into multiple groups, and provides the optimization in terms of power partition coefficient simultaneously, actually those skilled in the art
One of subject under discussion of concern.
Invention content
A kind of federated user grouping of present invention offer and power distribution method, a base station suitable for cooperative NOMA systems
K user apparatus for being distinguished into N number of group is transmitted a message to, wherein K is the even number and N=K/2 more than or equal to 2.The method packet
Include the following steps：K user apparatus is ranked up from large to small according to the channel gain between base station and K user apparatus；
It is strong user's candidate group that the forward N number of user apparatus that sorts, which is arranged, and it is that weak user is candidate that other N number of user apparatus, which are arranged,
Person group；By each in strong user's candidate group in a manner of one-to-one with it is every in weak user's candidate group
One pairing, and the corresponding power partition coefficient of two user apparatus and transimission power in each combinations of pairs are calculated simultaneously, it will
The K user apparatus is distinguished into N number of group；And according to the corresponding transmission of user apparatus in N number of group after the completion of pairing
Power transmits a message to the K user apparatus.
In one embodiment of this invention, wherein the process in pairing calculates two user apparatus in each combinations of pairs simultaneously
The method of corresponding power partition coefficient and transimission power is：To above-mentioned each combinations of pairs, two user apparatus are being maximized
In the case of corresponding group's received signal to noise ratio, the corresponding power partition coefficient of two user apparatus and transimission power are calculated,
Wherein group's received signal to noise ratio is, for example, reckling in the corresponding received signal to noise ratio of two user apparatus, but not as
Limit；The second channel that first channel gain of the first user device in two user apparatus is more than second user device increases
Benefit；These transimission powers include being intended to send the first transimission power of the first signal of the first user device to, being intended to send this to
Second transimission power of the second signal of second user device, and be intended to transfer the solution of the second signal from the first user device
Code result gives the third transimission power of the second user device；First transimission power, second transimission power and the third pass
The summation of defeated power is less than or equal to an overall transmission power, and first transimission power, second transimission power and third transmission
Power is respectively greater than 0, furthermore second transimission power is more than first transimission power；And group's received signal to noise ratio is included in
First user device end decodes the first signal-to-noise ratio of the first signal, and the second of second signal is decoded at first user device end
Signal-to-noise ratio, and decode the third signal-to-noise ratio of second signal in second user device end.
In one embodiment of this invention, it wherein to above-mentioned each combinations of pairs, is corresponded to maximizing two user apparatus
Group's received signal to noise ratio in the case of, the step of calculating the corresponding power partition coefficient of two user apparatus and transimission power
Including：The α that corresponding first transimission power is overall transmission power is setnTimes, corresponding second transimission power is overall transmission power
βnTimes and corresponding third transimission power be overall transmission power (1- αn-βn) times, wherein αnFor the first power distribution system
Number and 0<αn<1, βnFor the second power partition coefficient and 0<βn<1；Corresponding first signal-to-noise ratio is characterized as to have first power
Corresponding second signal-to-noise ratio is characterized as having first power partition coefficient and second power by the first function of distribution coefficient
The second function of distribution coefficient, and corresponding third signal-to-noise ratio is characterized as with first power partition coefficient and second work(
The third function of rate distribution coefficient；Limit the first function and the second function the first crosspoint be equal to the first function with
Second crosspoint of the third function, to obtain the cubic function for being associated with first power partition coefficient；To the cubic function
It solves, one of solution is the optimum solution of first power partition coefficient；The optimum solution of first power partition coefficient is substituted into
Second function, to calculate the optimum solution of second power partition coefficient；And the optimum solution based on first power partition coefficient
First transimission power is calculated, the optimum solution based on second power partition coefficient calculates second transimission power, and being based on should
The optimum solution of first power partition coefficient and the optimum solution of second power partition coefficient calculate the third transimission power.
In one embodiment of this invention, wherein the first function be first power partition coefficient strictly increasing letter
Number, and the second function and the third function are all the strictly decreasing function of first power partition coefficient.
In one embodiment of this invention, wherein the second function be second power partition coefficient strictly increasing letter
Number, and the strictly decreasing function that the third function is second power partition coefficient.
In one embodiment of this invention, wherein in a manner of one-to-one by each in strong user's candidate group
With each pairing in weak user's candidate group, the step of which is distinguished into N number of group, includes：
By each in strong user's candidate group and each pairing in weak user's candidate group, and calculate corresponding to each
The equivalent received signal-to-noise ratio of combinations of pairs, the wherein equivalent received signal to noise ratio be, for example, corresponding to two user apparatus this
Two signal-to-noise ratio add first signal-to-noise ratio with smaller in the third signal-to-noise ratio, but are not limited thereto；And according to being calculated
The K user apparatus is distinguished into N number of group by the equivalent received signal-to-noise ratio gone out.
In one embodiment of this invention, wherein according to a calculated equivalent received signal-to-noise ratio, by the K user apparatus
The step of being distinguished into N number of group include：It is selected for each in strong user's candidate group and receives noise with maximum equivalent
First combinations of pairs of ratio and the second combinations of pairs with the second largest equivalent received signal-to-noise ratio；For strong user's candidate group
Each in group calculates the difference of the maximum equivalent received signal to noise ratio and the second largest equivalent received signal-to-noise ratio, referred to as equivalent noise
Than loss；This for choosing the user apparatus with maximum equivalent snr loss from strong user's candidate group first is matched
To being combined as one of N number of group；Strong user apparatus in first combinations of pairs being selected is distinguished with weak user apparatus
User's candidate group that improves oneself deletes with weak user's candidate group；And repeat the above steps, until the strong user is candidate
Person group is all empty with weak user's candidate group.
The present invention provides a kind of base station, is suitable for cooperative NOMA systems.This base station include transmission circuit, storage circuit with
And processing circuit.Transmission circuit is distinguished into K user apparatus of N number of group to transmit a message to, and wherein K is more than or equal to 2
Even number and N=K/2.Storage circuit stores multiple program codes.Processing circuit couples transmission circuit and storage circuit, and passes through
Configuration is to execute following operation：According to the channel gain between base station and K user apparatus from large to small to the K user apparatus
It is ranked up；It is strong user's candidate group that the forward N number of user apparatus that sorts, which is arranged, and other N number of user apparatus are arranged and are
Weak user's candidate group；By each in strong user's candidate group in a manner of one-to-one with weak user's candidate group
In each pairing, and calculate in each combinations of pairs the corresponding power partition coefficient of two user apparatus and transmission work(simultaneously
The K user apparatus is distinguished into N number of group by rate；And according to the corresponding transmission work(of the N number of group after the completion of pairing
Rate transmits a message to the K user apparatus.
In one embodiment of this invention, wherein processing circuit is further configured to execute：To above-mentioned each matched group
It closes, in the case of two user apparatus of maximization corresponding group's received signal to noise ratio, it is corresponding to calculate two user apparatus
Power partition coefficient transimission power, wherein group's received signal to noise ratio are, for example, the corresponding received signal to noise ratio of two user apparatus
Middle reckling, but be not limited thereto；First channel gain of the first user device in two user apparatus is more than second
The second channel gain of user apparatus；These transimission powers include be intended to send to the first signal of the first user device first
Transimission power is intended to send the second transimission power of the second signal of the second user device to, and is intended to fill from first user
Set the third transimission power for transferring the decoding result of the second signal to the second user device；First transimission power, this
The summation of two transimission powers and the third transimission power be less than or equal to an overall transmission power, and first transimission power, this second
Transimission power and the third transimission power are respectively greater than 0, furthermore second transimission power is more than first transimission power；And it should
Group's received signal to noise ratio is included in the first signal-to-noise ratio that first user device end decodes the first signal, at first user device end
The second signal-to-noise ratio of second signal is decoded, and the third signal-to-noise ratio of second signal is decoded in second user device end.
In one embodiment of this invention, wherein processing circuit is further configured to execute：It is arranged corresponding first to pass
Defeated power is the α of overall transmission powernTimes, corresponding second transimission power is the β of overall transmission powernAgain and corresponding third passes
Defeated power is (the 1- α of overall transmission powern-βn) times, wherein αnFor the first power partition coefficient and 0<αn<1, βnFor the second power point
Distribution coefficient and 0<βn<1；Corresponding first signal-to-noise ratio is characterized as the first function with first power partition coefficient, it will be right
The second signal-to-noise ratio answered is characterized as the second function with first power partition coefficient and second power partition coefficient, and will
Corresponding third signal-to-noise ratio is characterized as the third function with first power partition coefficient and second power partition coefficient；Limit
The first crosspoint for making the first function and the second function is equal to second crosspoint of the first function and the third function,
To obtain the cubic function for being associated with first power partition coefficient；The cubic function is solved, one of solution for this first
The optimum solution of power partition coefficient；The optimum solution of first power partition coefficient is substituted into second function, to calculate second work(
The optimum solution of rate distribution coefficient；And the optimum solution based on first power partition coefficient calculates first transimission power, is based on
The optimum solution of second power partition coefficient calculates second transimission power, and based on the optimum solution of first power partition coefficient
The third transimission power is calculated with the optimum solution of second power partition coefficient.
In one embodiment of this invention, wherein the first function be first power partition coefficient strictly increasing letter
Number, and the second function and the third function are all the strictly decreasing function of first power partition coefficient.
In one embodiment of this invention, wherein the second function be second power partition coefficient strictly increasing letter
Number, and the strictly decreasing function that the third function is second power partition coefficient.
In one embodiment of this invention, wherein processing circuit is further configured to execute：By strong user's candidate group
Each in group and each pairing in weak user's candidate group, and calculate and connect corresponding to the equivalent of each combinations of pairs
Signal-to-noise ratio is received, the wherein equivalent received signal to noise ratio is, for example, second signal-to-noise ratio and the third corresponding to two user apparatus
Smaller adds first signal-to-noise ratio in signal-to-noise ratio, but is not limited thereto；And according to the calculated equivalent received noise of institute
Than the K user apparatus is distinguished into N number of group.
In one embodiment of this invention, wherein processing circuit is further configured to execute：For strong user's candidate group
Each in group is selected the first combinations of pairs with maximum equivalent received signal to noise ratio and is believed with the second largest equivalent received
Make an uproar than the second combinations of pairs；It calculates the maximum equivalent received signal to noise ratio for each in strong user's candidate group and is somebody's turn to do
The difference of the second largest equivalent received signal-to-noise ratio, referred to as equivalent signal-to-noise ratio are lost；It chooses to have from strong user's candidate group and be somebody's turn to do
First combinations of pairs of the user apparatus of maximum equivalent snr loss is one of N number of group；By be selected this first
Strong user apparatus and weak user apparatus in combinations of pairs are improved oneself respectively in user's candidate group and weak user's candidate group
It deletes；And repeat the above steps, until strong user's candidate group and weak user's candidate group are all empty.
Based on above-mentioned, a kind of federated user grouping of proposition of the embodiment of the present invention and power distribution method and the use side
The base station of method；User apparatus is first divided into strong use by the base station of the method according to the channel gain of each user apparatus in system
Family candidate group and weak user's candidate group, then according to each and the weak user in strong user's candidate group
The corresponding group received signal to noise ratio of each each combinations of pairs constituted in candidate group calculates power distribution system
Then number and transimission power determine point of end user's device according to the corresponding equivalent received signal to noise ratio of each combinations of pairs
Group, and then a kind of quick method is provided to find sub-optimal user's combinations of pairs.Comprehensive speech, technology provided by the present invention
The complexity of user grouping in downlink cooperative NOMA systems can be effectively reduced, it also can be effectively promoted and transmit efficiency and be
System capacity.
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and attached drawing is coordinated to provide
Detailed description are as follows.
Description of the drawings
Fig. 1 is the downlink cooperative NOMA system schematics that an embodiment according to the present invention is drawn.
Fig. 2 is the power partition coefficient and transimission power for the calculating user apparatus that an embodiment according to the present invention is drawn
Method flow diagram.
Fig. 3 is the federated user grouping and power distribution method flow chart that an embodiment according to the present invention is drawn.
【Symbol description】
100：Downlink cooperative NOMA systems
110：Base station
120_1、120_N：Group
130_1、130_2、130_3、130_4、130_5、130_6、130_7、130_8、130_N-1、130_N、130_N+
1、130_K-1、130_K：User apparatus
S210、S220、S230、S240、S250、S260、S310、S320、S330、S340：Step
Specific implementation mode
Fig. 1 is the downlink cooperative NOMA system schematics that an embodiment according to the present invention is drawn.In the present invention
Embodiment in, downlink cooperative NOMA systems 100, including base station 110 and will be distinguished into N number of group K user dress
Set (that is, group 120_1 ..., 120_N and user apparatus 130_1,130_2 ..., 130_K-1,130_K), wherein different groups
Group is assigned orthogonal resource, and each group includes two user apparatus of shared same channel resource.Therefore, downlink chain
The number K of user apparatus in road cooperative NOMA systems 100 is the even number (that is, K >=2 and K is even number) more than or equal to 2, and N
=K/2.
In addition to this, in actual application, base station 110 and user apparatus 130_1,130_2 ..., 130_K-1,
130_K can be each configured with NTAnd NRRoot antenna, to form the downlink system of multiple-input and multiple-output NOMA (MIMO-NOMA)
100, wherein NTAnd NRIt can be the arbitrary positive integer more than 1.However, in next embodiment, 110 He of base station of the invention
User apparatus 130_1,130_2 ..., 130_K-1,130_K only with single antenna as exemplary, to simplify system tray
Structure.
In the present embodiment, user apparatus 130_1,130_2 ..., 130_K-1,130_K can for example realize to be (but unlimited
In) movement station, advanced movement station (advanced mobile station；AMS), server, user terminal, desktop PC,
Laptop computer, network computer, work station, personal digital assistant (personal digital assistant；PDA)、
It is tablet computer (tablet personal computer, tablet PC), scanner, telephone device, pager, mutually mechanical, electrical
Depending on, handheld video game device, music apparatus, wireless sensor etc., the present invention is limited not to this.
In the present embodiment, base station 110 may include (but not limited to), for example, eNB, household eNB (Home eNB), advanced
Base station (advanced base station；ABS), base station transceiver system (base transceiver system；BTS it), connects
Access point, one's original domicile base station (home BS), repeater, intermediate node, intermediate equipment and/or satellite-based communication base station, but this
The embodiment of invention is not limited to this.
From hardware point, base station 110 can include at least (but not limited to) transmission circuit, processing circuit and optionally select
Storage circuit.Transmission circuit may include transmitter circuit, analog to digital (analog-to-digital；A/D) converter, D/
A converters, low noise amplification, mixing, filtering, impedance matching, transmission line, power amplification, one or more antenna circuits and local
Storage medium element (but the present invention is not limited thereto) is used with providing Wireless transceiver/receive capabilities for base station 110 to described K
Family device (that is, user apparatus 130_1,130_2 ..., 130_K-1,130_K).Storage circuit be, for example, memory, hard disk or
It is any other to store the element of data, and may be configured to record multiple program codes or module.
Processing circuit is configured to processing digital signal and executes method proposed in the exemplary embodiments of the present invention
Function, processing routine or method and step.In addition, processing circuit be optionally coupled to memory circuit with store program code,
Device configuration, codebook, buffering or permanent data etc..The function of processing circuit can be used such as microprocessor, microcontroller,
The programmable units such as dsp chip, FPGA are implemented.The function of processing circuit also can use independent electronic or IC to implement, and locate
Reason circuit can also use hardware or software implementation.
On the other hand, the stages are transmitted comprising two in each group due to downlink cooperative NOMA systems 100,
The system model corresponding to each stage will be described in detail below in respectively NOMA stages and relay stages.
First, in the NOMA stages, it is assumed that user apparatus 130_1,130_2 ..., arbitrary two in 130_K-1,130_K
A user apparatus is assigned to same group, for example, k-th of user apparatus and first of user apparatus are assigned to n-th of group
(wherein 0<n<N).Since two user apparatus in same group share identical channel, base station 110 is intended to send to n-th
The signal of k-th of user apparatus and first of user apparatus in a group can be expressed as：
Wherein PS,nAnd PW,nRespectively transmission signal skAnd slTo the transmission work(of k-th of user apparatus and first of user apparatus
Rate.It should be noted that data-signal can be normalized for E [| sm|2]=1, m ∈ S, wherein E [] indicate statistical expectation.
In addition, the signal received in m-th of user apparatus can be expressed as：
ym=hmxn+wm, m ∈ k, l, equation (2)
Wherein hmThe transmission channel being expressed as between base station 110 and m-th of user apparatus, it is assumed herein that transmission channel is complete
The channel state information (channel state information) of office (global), wmIt then indicates in m-th user apparatus
Receive noise, wmFor example, additive white Gaussian noise (additive white Gaussian noise；AWGN), but it is of the invention
It is limited not to this.
It is worth noting that, it is assumed herein that k-th of user apparatus channel gain be more than first of user apparatus channel
Gain (that is, | hk|2>|hl|2), therefore it is strong user to define k-th of user apparatus, and first of user apparatus is weak user.According to
The principle of NOMA technologies should be less than the transimission power distribution of the signal of strong user the transimission power of the signal for weak user
Distribute (i.e. PS,n<PW,n).Then, for weak user, subtle disruption caused by the signal by strong user can be considered as making an uproar
Sound, therefore the data-signal of itself can be directly decoded out.And strong user then can simply be removed by SIC programs and decoded
Weak user signal.In the case of without loss of generality, all noise variance numbers hypothesis is all identical and is represented by σ2,
But the present invention is limited not to this.Therefore, during SIC programs, weak use is decoded for strong user (k-th of user apparatus)
The signal s at family (first of user apparatus)lReceived signal to noise ratio (signal to noise ratio；SNR it) can be expressed as：
In the signal s of weak user (first of user apparatus)lAfter decoded and removed, for strong user (k-th of user
Device) decode the data-signal s of itselfkReceived signal to noise ratio can be expressed as：
Next, in relay stages, decoding is applied to strong user with biography (decode-and-forward) strategy is turned
End, to help to turn to pass the signal s decodedlTo weak user.Therefore, first of user apparatus is received in relay stages
Signal can be expressed as：
Wherein PR,nTo improve oneself, user terminal transmits signal slTo the transimission power of first of user apparatus, gk,lTo be used at k-th
Rayleigh fading channel (Rayleigh fading channel) coefficient between family device and first of user apparatus, vlThen indicate
In the reception noise of first of user apparatus, vlFor example, additive white Gaussian noise, but the present invention is limited not to this.
After this stage, max ratio combined (maximum ratio for example may be used in first of user apparatus
combining；MRC the signal for) being incorporated in the NOMA stages and being received in relay stages, but the present invention is limited not to this
System.Therefore, the signal s of itself is decoded for weak user (first of user apparatus)lReceived signal to noise ratio can be expressed as：
In summary two transmission stages, when k-th of user apparatus and first of user apparatus are assigned to the same group
Equivalent received signal-to-noise ratio can be expressed as：
γk,l≡SNRk,k+min{SNRk,l,SNRl,lEquation (7)
Further, two indicator variable ψ are defined if downlink cooperative NOMA systems 100k,lTo refer to
Show the packet mode of K user apparatus：
And assume K user apparatus according to itself channel gain it is descending sort successively (that is, | h1|2>|h2|2
>...>|hk|2), then the whole equivalent received signal-to-noise ratio of downlink cooperative NOMA systems 100 can be expressed as：
In order to effectively promote the performance of downlink cooperative NOMA systems 100, the present invention wishes by for user
Device distribution transimission power appropriate simultaneously maximizes the equivalent received noise of system entirety in conjunction with preferable user grouping mode
Than.In the case, downlink cooperative NOMA systems are maximized in conjunction with the restrictive conditions such as user grouping and power distribution
The optimization problem of 100 whole equivalent received signal-to-noise ratio, can be expressed as：
Limitation
PS,n+PW,n+PR,n≤PTEquation (10d)
PS,n,PW,n,PR,n>0,PW,n>PS,nEquation (10e)
WhereinIndicate the pairing matrix of particular demographic distribution,Indicate power distribution matrix.In this optimization problem,
Equation (10b) and (10c) to ensure user apparatus can with itself other than the pairing of only one user apparatus.Equation (10d)
To be limited for the overall transmission power of single group.Equation (10e) reacts base station 110 and uses non-zero transimission power with strong user
Come the fact that transmit signal.
In order to seek preferable user grouping mode in the case where optimizing equation (10) and be associated with each
The power distribution method of user apparatus, the present invention it will be assumed at this can be in two user apparatus in maximizing any group
The corresponding transimission power of two user apparatus is calculated in the case of one group's received signal to noise ratio.And then it finds and can reach equation
The combinations of pairs of the user grouping of (10a).
In the present embodiment, the present invention calculates n-th group by optimizing equivalent received signal-to-noise ratio shown in equation (7)
The corresponding transimission power of two user apparatus in group, wherein 0<n<N.It should be noted that for a given group, based on strong
User terminal has used decoding and has turned to pass strategy, needs strong user completely to decode base station 110 and is intended to send the signal of weak user to,
Base station 110 should also be provided enough reception SNR to strong user and weak user and is decoded with the signal to itself simultaneously.Cause
This maximizes single group's received signal to noise ratio by following equation (11), also can get above-mentioned equation from the perspective of justice
(7) equivalent received signal-to-noise ratio shown in：
Limit PS,n+PW,n+PR,n≤PTEquation (11b)
PS,n,PW,n,PR,n>0,PW,n>PS,nEquation (11c)
According to equation (11a), k-th of user apparatus transmission corresponding with first of user apparatus in n-th of group
Power, including be intended to send the signal s of k-th of user apparatus tokTransimission power PS,n, be intended to send the letter of first of user apparatus to
Number slTransimission power PW,n, and will be from k-th of user apparatus transmission signal slTo the transimission power P of first of user apparatusR,n。
According to equation (11b) and (11c), transimission power PS,n、PW,nAnd PR,nSummation be less than or equal to an overall transmission power PT, transmit work(
Rate PS,n、PW,nAnd PR,nRespectively greater than 0, and PW,nMore than PS,n.In addition to this, above-mentioned group's received signal to noise ratio is included in k-th of use
Family device end decodes signal skSignal to Noise Ratio (SNR)k,k, signal s is decoded at first of user apparatus endlSignal to Noise Ratio (SNR)l,l,
And decode signal s at k-th of user apparatus endlSignal to Noise Ratio (SNR)k,l。
Illustrate how that the group of two user apparatus connects in maximizing any group using equation (11) to become apparent from
In the case of receiving signal-to-noise ratio, the transimission power of two user apparatus is calculated, Fig. 2 shows an embodiment institute according to the present invention
The method flow diagram for calculating user apparatus corresponding power partition coefficient and transimission power of drafting, and the method for Fig. 2 can be by base
Stand 110 execute.
In step S210, transimission power P is arranged in base station 110S,nFor overall transmission power PTαnTimes, transimission power PW,nFor
Overall transmission power PTβnTimes and transimission power PR,nFor overall transmission power PT(1- αn-βn) times.In this implementation example, αn
For transimission power PS,nPower partition coefficient, and 0<αn<1。βnFor transimission power PW,nPower partition coefficient, and 0<βn<1。
In step S220, base station 110 is by Signal to Noise Ratio (SNR)k,kIt is characterized as with power partition coefficient αnFirst function
SNRk,k(αn), by Signal to Noise Ratio (SNR)k,lIt is characterized as with power partition coefficient αnWith power partition coefficient βnSecond function SNRk,l
(αn,βn), and by Signal to Noise Ratio (SNR)l,lIt is characterized as with power partition coefficient αnWith power partition coefficient βnThird function SNRl,l
(αn,βn)。
In the present embodiment, about first function SNRk,k(αn), second function SNRk,l(αn,βn) and third function SNRl,l
(αn,βn) representation can refer to following equation (12), (13) and (14) respectively.
SNRk,k(αn)=ρ | hk|2αnEquation (12)
Base this, the optimization problem of the single group's received signal to noise ratio of maximization about the present embodiment can also αnAnd βn's
Function representation, as shown below：
Limit αn+βn<1 equation (15b)
βn>αn>0 equation (15c)
Significantly, since first function SNRk,k(αn) it is power partition coefficient αnA strictly increasing function, and
Second function SNRk,l(αn,βn) and third function SNRl,l(αn,βn) it is all power partition coefficient αnA strictly decreasing function, institute
With for the angle of mathematics, second function SNRk,l(αn,βn) and third function SNRl,l(αn,βn) will in first function
SNRk,k(αn) there are two crosspoints, it is represented by respectively：
In addition to this, second function SNRk,l(αn,βn) it is power partition coefficient βnA strictly increasing function, and third letter
Number SNRl,l(αn,βn) it is with | gk,l|2>|hl|2/(ρ|hl|2αn+ 1) power partition coefficient βnA strictly decreasing function.On
State | gk,l|2>|hl|2/(ρ|hl|2αn+ 1) condition be indicate due to using have decoding with turn crossing after MRC technologies in weak use
Combination receives signal during two stages at family, and foot should be provided with enough intensity for the channel gain in two stages
The enough good signal quality for detection.In the case, when equation (16) is equal with (17), equation (15a) can be made
Object function maximizes.
Therefore, in step S230, base station 110 limits first function SNRk,k(αn) and second function SNRk,l(αn,βn)
First crosspoint is equal to first function SNRk,k(αn) and third function SNRl,l(αn,βn) the second crosspoint, to obtain association
In power partition coefficient αnA cubic function (cubic function).
In the present embodiment, this letter shows and can be expressed as three timesWherein a=ρ | hk|2|hl
|2|gk,l|2, b=ρ | gk,l|2(|hk|2+2|hl|2), c=| hk|2-|hl|2+ρ|hl|2|gk,l|2And d=- | gk,l|2。
In step S240, base station 110 solves cubic function, and wherein one of solution of this cubic function is power
Distribution coefficient αnOptimum solution
In the present embodiment, triangle (trigonometric) method will be used to solve cubic function, but the present invention is not
It is only limitted to this.Three kinds of solutions of this cubic function can be expressed as：
Wherein e=(- b3/27a3)-(d/2a)+(bc/6a2) and f=(c/3a)-(b2/9a2)。
The present invention by discriminate by being expressed as δ=e2+f3To check the solution of above-mentioned cubic function.Work as δ>When 0, letter three times
Number is several with a Real Number Roots and two conjugate complexes.As δ=0, there are three Real Number Roots for cubic function tool.Work as δ<When 0, letter three times
There are three different Real Number Roots for number tool.Due to α1,nα2,nα3,n=-d/a>0 display cubic function at least have there are one positive real number
Root, and α1,n+α2,n+α3,n=-b/a<0 shows that the real part of other two roots is negative.In other words, in three kinds of solutions,
Only there are one solutions can be used as power partition coefficient, therefore can get power partition coefficient αnOptimum solutionFor：
In step s 250, base station 110 is by by power partition coefficient αnOptimum solutionSubstitute into second function SNRk,l
(αn,βn), to calculate power partition coefficient βnOptimum solutionIn the present embodiment, equation (21) is substituted into equation (16), i.e.,
Power partition coefficient β can be calculatednOptimum solutionFor：
In step S260, base station 110 is based on power partition coefficient αnOptimum solutionCalculate transimission power PS,n, base
In power partition coefficient βnOptimum solutionCalculate transimission power PW,n, and it is based on power partition coefficient αnOptimum solutionAnd power partition coefficient βnOptimum solutionCalculate transimission power PR,n。
Accordingly, via above-mentioned steps S210~S260, base station 110 can be in the feelings for maximizing single group's received signal to noise ratio
Under condition, the corresponding optimal transmission power of two user apparatus is calculated in a group (that is, transimission power PS,n、PW,nAnd PR,n)。
In addition to this, the equivalent received signal-to-noise ratio of two user apparatus for being assigned to same group also can be by power distribution system
Number αnOptimum solutionAnd power partition coefficient βnOptimum solutionEquation (12)~(14) are substituted into respectively by by equation (7)
And it obtains.
Next, after determining for the corresponding optimal transmission power of two user apparatus in single group, base station
110 can reach searching the combinations of pairs of the user grouping of equation (10a).
Significantly, since it is determined that go out the corresponding optimal transmission power of two user apparatus in single group, it is
Preferably distributing user device is to each group, it is considered herein that a given user is to the object function in equation (12)
Particular value T, that is, work as SNRk,k(αnWhen)=T, power partition coefficient αnIt can be expressed as：
Work as SNRk,l(αn,βnWhen)=T, equation (23) is substituted into equation (13), power partition coefficient βnIt can be expressed as：
In addition, equation (23) and (24) are substituted into equation (14), available the following conditions are realized into T：
Equation (25) implys that the channel gain between strong user and weak user | gk,l|2It is specific to have to be larger than some
Value, to obtain certain performance.Further, since | gk,l|2>0, the denominator of the lower limit of equation (25) also has to be larger than 0, thus can
Push away to obtain ρ | hk|2>(T2+2T).That is, the signal-to-noise ratio ρ when transmission increases, can reduce between strong user and weak user
Channel gain | gk,l|2Lower limit reach particular value T, will make | gk,l|2The condition of equation (25) can readily be met.Therefore,
The upper limit of received signal to noise ratio for giving a user couple can be expressed as：
The upper limit of equation (26) show the corresponding received signal to noise ratio of the user be only dependent upon base station and strong user it
Between the signal-to-noise ratio and channel gain that transmit.In other words, not only the channel gain of the strong user in each group will influence
The performance of user grouping, strong user will also determine the maximum received signal to noise ratio of a group.
Base this, Fig. 3 is the federated user grouping and power distribution method flow chart that an embodiment according to the present invention is drawn.
The method of Fig. 3 can also be executed by base station 110.Illustrate federated user grouping and the work(of Fig. 3 hereinafter with reference to the system architecture of Fig. 1
Each step of rate distribution method.
In step S310, base station 110 from large to small uses K according to its channel gain between K user apparatus
Family device is ranked up.
In this example, it is assumed that base station 110 respectively with user apparatus 130_1,130_2 ..., 130_K-1,130_K
Sequential is channel gain from large to small | h1|2>|h2|2>...>|hK|2, then base station 110 is by user apparatus 130_1,130_
2 ..., 130_K-1,130_K are ranked sequentially according to this.
In step s 320, the setting of base station 110 sorts forward N number of user apparatus as the last one user's candidate group, and
Setting other users device is weak user's candidate group.
In the present embodiment, since the channel gain of the strong user in each known group will influence the property of user grouping
Can, thus base station 110 by channel gain sort top n user apparatus (that is, user apparatus 130_1,130_2 ..., 130_N-1,
130_N) be set as strong user's candidate group, by remaining user apparatus (that is, user apparatus 130_N+1 ..., 130_K-1,
130_K) it is set as weak user's candidate group.It should be noted that since base station 110 in a subsequent step is intended to strong to use
Each in the candidate group of family makes K use in a manner of one-to-one with each pairing in weak user's candidate group
Family device is divided into a group, therefore above-mentioned N=K/2 two-by-two.
In step S330, base station 110 by each in strong user's candidate group in a manner of one-to-one with weak use
Each pairing in the candidate group of family, and the corresponding power distribution system of two user apparatus in each combinations of pairs is calculated simultaneously
Number and transimission power, N number of group is distinguished by K user apparatus.
In the present embodiment, base station 110 can by each in strong user's candidate group respectively with weak user's candidate
All user apparatus pairing in group, and calculate group's received signal to noise ratio corresponding to each pairing.It should be noted that each
Group's received signal to noise ratio of pairing can be by the corresponding power partition coefficient point of two user apparatus in the obtained group of Fig. 2 steps
Not Dai Ru equation (12)~(14) obtained by by equation (7).It is noted that in order to simplify the complexity of system, on
In power partition coefficient Formula Solution and equation (12)~(14) stated channel gain (that is, | hk|2、|hl|2And | gk,l|2) also may be used
Replaced by the characteristic of channel of stable state, the present invention is limited not to this.
Next, base station 110 can be determined according to group received signal to noise ratio in strong user's candidate group each with it is weak
The combinations of pairs of each in user's candidate group, N number of group is distinguished by K user apparatus.Specifically, base station
110 can be that group with maximum value receives in the user apparatus that each selection in strong user's candidate group is matched with it
Signal-to-noise ratio.In addition, base station 110 can also be to have in the user apparatus that each selection in strong user's candidate group is matched with it
Group's received signal to noise ratio of some Second Largest Values.Then, base station 110 can be each calculating one in strong user's candidate group
Equivalent signal-to-noise ratio loses, and equivalent signal-to-noise ratio loss is the difference of maximum group's received signal to noise ratio and second largest group's received signal to noise ratio.
Base station 110 is matched by the user apparatus in the strong user candidate group person for selecting the equivalent signal-to-noise ratio with maximum value to lose for one
The candidate of the weak user corresponding to group's received signal to noise ratio with maximum value is matched to a strong user in combination, and with it
One weak user of user apparatus in group person combinations of pairs thus, and by this combinations of pairs as N number of group wherein it
One.This means that such user's distribution can make in group's received signal to noise ratio with maximum value with the strong user in
User apparatus in candidate group is matched with the user apparatus in weak user's candidate group, and can be waited to avoid strong user
Weak user's candidate group with centering of group's received signal to noise ratio of user apparatus and the Second Largest Value having in Xuan Zhe groups
User apparatus pairing (that is, avoiding poor equivalent signal-to-noise ratio) in group.
Later, the strong user that above-mentioned pairing is completed is improved oneself and is removed in user's candidate group by base station 110, and is matched above-mentioned
The weak user of completion is removed from weak user's candidate group.In this way, base station 110 will repeat the above steps, until
Strong user's candidate group and weak user's candidate group are sky.Thus, which base station 110 can be by strong user's candidate group
In each in a manner of one-to-one with each pairing in weak user's candidate group, by the differentiation of K user apparatus
At N number of group.
It should be noted that although user packet method set forth above may can't always be the optimization for ensureing equation (10)
Problem is best state, but it can provide quick method to find sub-optimal user couple.
In one embodiment of this invention, each in strong user's candidate group and weak user's candidate group are determined
In the pairing of each, by K user apparatus be distinguished into N number of group can by matrix in a manner of implement, but the present invention
It is limited not to this.In this example, it is assumed that downlink cooperative NOMA systems 100 have 8 user apparatus
(that is, user apparatus 130_1,130_2 ..., 130_8), and strong user's candidate group include user apparatus 130_1,130_2,
130_3,130_4, and weak user's candidate group includes user apparatus 130_5,130_6,130_7,130_8.In order to make to use by force
A dimension is established in each and the pairing of each in weak user's candidate group, base station 110 in the candidate group of family
Matrix is matched for 4 × 4 the first userAs follows：
Wherein the first user matches matrixIn element definition be qi,j=γi,j+4, i, j ∈ { 1,2,3,4 } indicate to work as
The equivalent received signal-to-noise ratio that i-th of user apparatus and (j+4) a user apparatus are assigned to same group (can refer to equation
(7) it calculates).For example, q1,1=γ1,5Indicate the user apparatus 130_1 in strong user's candidate group and weak user candidate
The equivalent received signal-to-noise ratio corresponding to user apparatus 130_5 pairings in person group.
In equation (27), it is assumed that q1,3、q2,4、q3,1And q4,1Matching each row in matrix Q for the first user has most
The element being worth greatly, and assume q1,1、q2,3、q3,3And q4,4Matrix is matched for the first userIn each row there is Second Largest Value
Next element establishes another second user pairing matrix according to this, as follows：
Wherein second user matches matrixEach row be defined to correspond to each in strong user's candidate group
Equivalent signal-to-noise ratio loss.
Assuming that (q1,3-q1,1) be four value in the maximum, base station 110 will select the use in strong user's candidate group
Family device 130_1 is a strong user in a combinations of pairs, and selects the user apparatus in weak user's candidate group
One weak user of 130_5 combinations of pairs thus, and by the combinations of pairs as one of 4 groups.Later, base station
110, which will remove the first user, matches matrixIn the 1st row with the 3rd row.In this way, base station 110 will repeat above-mentioned distribution
Step matches matrix until the first userFor an empty matrix.Thus, which base station 110 can be by downlink cooperative
8 user apparatus in NOMA systems 100 are distinguished into 4 groups.
Finally, in step S340, base station 110 is according to the corresponding transimission power of user apparatus in above-mentioned N number of group, according to this
Transmit a message to K user apparatus.
In the present embodiment, a group of two user apparatus in maximizing each group is received noise by base station 110
Than in the case of, the transimission power of two user apparatus is calculated, to obtain the transimission power corresponding to K user apparatus.Value
One be mentioned that, a user apparatus in above-mentioned each group will be associated with strong user's candidate group, and another user
Device will be associated with weak user's candidate group, therefore meet and calculate two user apparatus in any one group in the step in figure 2
Corresponding power partition coefficient and transimission power restrictive condition (i.e. | hk|2>|hl|2Or PS,n<PW,n).Therefore, above-mentioned N number of group
The step of power partition coefficient corresponding to each user apparatus in group can be based on Fig. 2 with transimission power calculates, and then makes
K user apparatus can be transmitted a message to according to this by obtaining base station 110.
In conclusion the embodiment of the present invention proposes that a kind of federated user is grouped with power distribution method and uses the side
The base station of method；User apparatus is first divided into strong use by the base station of the method according to the channel gain of each user apparatus in system
Family candidate group and weak user's candidate group, then according to each and the weak user's candidate in strong user's candidate group
Group's received signal to noise ratio corresponding to the combinations of pairs of each in group determines the grouping of user, and then provides a kind of fast
The method of speed finds sub-optimal user's combinations of pairs.In addition, group of the base station of the method in maximizing single group connects
In the case of receiving signal-to-noise ratio, the corresponding transimission power of two user apparatus in each group is calculated.Comprehensive speech, the present invention is carried
The technology of confession can effectively reduce the complexity of user grouping in downlink cooperative NOMA systems, also can effectively promote its transmission
Efficiency and power system capacity.
Although the present invention is disclosed as above with embodiment, however, it is not to limit the invention；Those skilled in the art,
Do not depart from the spirit and scope of the present invention, when can carry out it is appropriate change and retouch, so these change and retouch and all still should be
Appended claims is covered.
Claims (14)
1. a kind of federated user grouping and power distribution method, are suitable for cooperative Non-orthogonal Multiple and access (non-
orthogonal multiple access；NOMA) base station transmits a message to the K user dress for being distinguished into N number of group in system
It sets, wherein K is the even number and N=K/2 more than or equal to 2, which is characterized in that the method includes：
The K user apparatus is arranged from large to small according to K channel gain between the base station and the K user apparatus
Sequence；
It is strong user's candidate group that the forward N number of user apparatus of the sequence, which is arranged, and it is weak that other N number of user apparatus, which are arranged,
User's candidate group；
Each in strong user's candidate group is matched with each in weak user's candidate group, and same
When calculate the corresponding power partition coefficient of two user apparatus and transimission power in each combinations of pairs, by the K user apparatus
It is distinguished into N number of group；And
According to the corresponding transimission power of user apparatus in N number of group after the completion of pairing, K user's dress is transmitted a message to
It sets.
2. the method as described in claim 1, which is characterized in that each and this in described pair of strong user's candidate group
Each in weak user's candidate group is matched, and calculates the corresponding work(of two user apparatus in each combinations of pairs simultaneously
The method of rate distribution coefficient and transimission power is：
To each combinations of pairs, in the case where maximizing the corresponding group's received signal to noise ratio of two user apparatus, meter
The corresponding power partition coefficient of two user apparatus and transimission power are calculated,
The first user device of wherein two user apparatus is associated with strong user's candidate group, and second user device closes
It is coupled to weak user's candidate group,
Group's received signal to noise ratio is reckling in the corresponding received signal to noise ratio of two user apparatus,
First channel gain of the first user device is more than the second channel gain of the second user device,
These transimission powers include being intended to send the first transimission power of the first signal of the first user device to, being intended to send this to
Second transimission power of the second signal of second user device, and be intended to transfer the solution of the second signal from the first user device
Code result gives the third transimission power of the second user device,
The summation of first transimission power, second transimission power and the third transimission power is less than or equal to overall transmission power, should
First transimission power, second transimission power and the third transimission power are respectively greater than 0, and second transimission power be more than this
One transimission power,
The corresponding received signal to noise ratio of two user apparatus is included in first signal that the first user device end decodes
First signal-to-noise ratio is filled in the second signal-to-noise ratio of the second signal that the first user device end decodes, and in the second user
Set the third signal-to-noise ratio that end decodes the second signal.
3. method as claimed in claim 2, which is characterized in that any of the above-described combinations of pairs, maximizing two user's dresses
In the case of setting corresponding group's received signal to noise ratio, the corresponding power partition coefficient of two user apparatus and transimission power are calculated
The step of include：
The α that corresponding first transimission power is the overall transmission power is setnTimes, which is the overall transmission power
βnTimes, and (the 1- α that the third transimission power is the overall transmission powern-βn) times, wherein 0<αn<1 is known as the first power distribution
Coefficient, and 0<βn<1 is known as the second power partition coefficient；
First signal-to-noise ratio is characterized as to the first function of first power partition coefficient, by second signal-to-noise ratio be characterized as this
The second function of one power partition coefficient and second power partition coefficient, and the third signal-to-noise ratio is characterized as first power
The third function of distribution coefficient and second power partition coefficient；
The first crosspoint for limiting the first function and the second function is equal to the second of the first function and the third function
Crosspoint, to obtain the cubic function for being associated with first power partition coefficient；
The cubic function is solved, one of solution is the optimum solution of first power partition coefficient；
The first power partition coefficient optimum solution is substituted into the second function, to calculate the best of second power partition coefficient
Solution；And
Optimum solution based on first power partition coefficient calculates first transimission power, based on second power partition coefficient
Optimum solution calculates second transimission power, and the optimum solution based on first power partition coefficient and second power partition coefficient
Optimum solution calculate the third transimission power.
4. method as claimed in claim 3, which is characterized in that the first function is that the stringent of first power partition coefficient is passed
Increasing function, and the second function and the third function are all the strictly decreasing function of first power partition coefficient.
5. method as claimed in claim 3, which is characterized in that the second function is that the stringent of second power partition coefficient is passed
Increasing function, and the strictly decreasing function that the third function is second power partition coefficient.
6. method as claimed in claim 3, which is characterized in that each and the weak use in strong user's candidate group
Each in the candidate group of family is matched, and the step of which is distinguished into N number of group includes：
Each in strong user's candidate group is matched with each in weak user's candidate group, and according to
It is calculated according to optimum solution of first power partition coefficient and the optimum solution of second power partition coefficient of each combinations of pairs
These corresponding received signal to noise ratio；And
The corresponding equivalent received signal-to-noise ratio of two use devices in each combinations of pairs is calculated, wherein the effect received signal to noise ratio is
Second signal-to-noise ratio corresponding to two user apparatus and smaller in the third signal-to-noise ratio add first signal-to-noise ratio, and according to
The K user apparatus is distinguished into N number of group.
7. method as claimed in claim 6, which is characterized in that connect according to the corresponding effect of the calculated each combinations of pairs of institute
Signal-to-noise ratio is received, the step of which is distinguished into N number of group includes：
It is every in strong user's candidate group according to the corresponding effect received signal to noise ratio of the calculated each combinations of pairs of institute
One the first combinations of pairs selected with maximum equivalent received signal to noise ratio and with the second largest equivalent received signal-to-noise ratio
Two combinations of pairs；
Equivalent signal-to-noise ratio loss is calculated for each in strong user's candidate group, wherein the effect snr loss is should
The difference of maximum equivalent received signal to noise ratio and the second largest equivalent received signal-to-noise ratio；
First pairing having corresponding to the effect snr loss maximum value person is chosen from strong user's candidate group
It is combined as one of N number of group；
Two user apparatus in first combinations of pairs being selected are weak with this from strong user's candidate group respectively
It is deleted in user's candidate group；And
It repeats the above steps, until strong user's candidate group and weak user's candidate group are all empty.
8. a kind of base station is suitable for cooperative Non-orthogonal Multiple access system, which is characterized in that the base station includes：
Transmission circuit, to transmit a message to K user apparatus for being distinguished into N number of group, wherein K is the even number more than or equal to 2
And N=K/2；
Storage circuit stores multiple program codes；And
Processing circuit couples the transmission circuit and the storage circuit, and is configured to execute following operation：
The K user apparatus is arranged from large to small according to K channel gain between the base station and the K user apparatus
Sequence；
It is strong user's candidate group that the forward N number of user apparatus of the sequence, which is arranged, and it is weak that other N number of user apparatus, which are arranged,
User's candidate group；
Each in strong user's candidate group is matched with each in weak user's candidate group, and same
When calculate the corresponding power partition coefficient of two user apparatus and transimission power in each combinations of pairs, by the K user apparatus
It is distinguished into N number of group；And
According to the corresponding transimission power of user apparatus in N number of group after the completion of pairing, K user's dress is transmitted a message to
It sets.
9. base station as claimed in claim 8, which is characterized in that the processing circuit is further configured to hold each combinations of pairs
The following method of row：
To each combinations of pairs, in the case where maximizing the corresponding group's received signal to noise ratio of two user apparatus, meter
The corresponding power partition coefficient of two user apparatus and transimission power are calculated,
The first user device of wherein two user apparatus is associated with strong user's candidate group, and second user device closes
It is coupled to weak user's candidate group,
Group's received signal to noise ratio is reckling in the corresponding received signal to noise ratio of two user apparatus,
First channel gain of the first user device is more than the second channel gain of the second user device,
These transimission powers include being intended to send the first transimission power of the first signal of the first user device to, being intended to send this to
Second transimission power of the second signal of second user device, and be intended to transfer the solution of the second signal from the first user device
Code result gives the third transimission power of the second user device,
The summation of first transimission power, second transimission power and the third transimission power is less than or equal to overall transmission power, should
First transimission power, second transimission power and the third transimission power are respectively greater than 0, and second transimission power be more than this
One transimission power；And
The corresponding received signal to noise ratio of two user apparatus is included in first signal that the first user device end decodes
First signal-to-noise ratio is filled in the second signal-to-noise ratio of the second signal that the first user device end decodes, and in the second user
Set the third signal-to-noise ratio that end decodes the second signal.
10. base station as claimed in claim 9, which is characterized in that the processing circuit is further configured to each match to above-mentioned
The following steps are executed to combination：
The α that corresponding first transimission power is the overall transmission power is setnTimes, which is the overall transmission power
βnTimes, and (the 1- α that the third transimission power is the overall transmission powern-βn) times, wherein 0<αn<1 is known as the first power distribution
Coefficient, and 0<βn<1 is known as the second power partition coefficient；
First signal-to-noise ratio is characterized as to the first function of first power partition coefficient, by second signal-to-noise ratio be characterized as this
The second function of one power partition coefficient and second power partition coefficient, and the third signal-to-noise ratio is characterized as first power
The third function of distribution coefficient and second power partition coefficient；
The first crosspoint for limiting the first function and the second function is equal to the second of the first function and the third function
Crosspoint, to obtain the cubic function for being associated with first power partition coefficient；
The cubic function is solved, one of solution is the optimum solution of first power partition coefficient；
The first power partition coefficient optimum solution is substituted into the second function, to calculate the best of second power partition coefficient
Solution；And
Optimum solution based on first power partition coefficient calculates first transimission power, based on second power partition coefficient
Optimum solution calculates second transimission power, and the optimum solution based on first power partition coefficient and second power partition coefficient
Optimum solution calculate the third transimission power.
11. base station as claimed in claim 10, which is characterized in that the first function is the stringent of first power partition coefficient
Increasing function, and the second function and the third function are all the strictly decreasing function of first power partition coefficient.
12. base station as claimed in claim 10, which is characterized in that the second function is the stringent of second power partition coefficient
Increasing function, and the strictly decreasing function that the third function is second power partition coefficient.
13. base station as claimed in claim 10, which is characterized in that the processing circuit is further configured to execute：
Each in strong user's candidate group is matched with each in weak user's candidate group, and according to
It is calculated according to optimum solution of first power partition coefficient and the optimum solution of second power partition coefficient of each combinations of pairs
These corresponding received signal to noise ratio；And
The corresponding equivalent received signal-to-noise ratio of two use devices in each combinations of pairs is calculated, wherein the effect received signal to noise ratio is
Second signal-to-noise ratio corresponding to two user apparatus and smaller in the third signal-to-noise ratio add first signal-to-noise ratio, and according to
The K user apparatus is distinguished into N number of group.
14. base station as claimed in claim 13, which is characterized in that the processing circuit is further configured to execute：
It is every in strong user's candidate group according to the corresponding effect received signal to noise ratio of the calculated each combinations of pairs of institute
One the first combinations of pairs selected with maximum equivalent received signal to noise ratio and with the second largest equivalent received signal-to-noise ratio
Two combinations of pairs；
Equivalent signal-to-noise ratio loss is calculated for each in strong user's candidate group, wherein the effect snr loss is should
The difference of maximum equivalent received signal to noise ratio and the second largest equivalent received signal-to-noise ratio；
First pairing having corresponding to the effect snr loss maximum value person is chosen from strong user's candidate group
It is combined as one of N number of group；
Two user apparatus in first combinations of pairs being selected are weak with this from strong user's candidate group respectively
It is deleted in user's candidate group；And
It repeats the above steps, until strong user's candidate group and weak user's candidate group are all empty.
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