CN106658694B - A kind of methods, devices and systems of allocation of downlink power - Google Patents
A kind of methods, devices and systems of allocation of downlink power Download PDFInfo
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- CN106658694B CN106658694B CN201510469051.3A CN201510469051A CN106658694B CN 106658694 B CN106658694 B CN 106658694B CN 201510469051 A CN201510469051 A CN 201510469051A CN 106658694 B CN106658694 B CN 106658694B
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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
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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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
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
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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
- H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
- H04W52/283—Power depending on the position of the mobile
Abstract
The embodiment of the present invention provides a kind of methods, devices and systems of allocation of downlink power, and method includes: the position according to user in cell, determines the user for needing to match；It determines PDMA pattern matrix, distributes different PDMA pattern set of vectors for each user, power distribution pattern matrix is formed according to the PDMA pattern set of vectors；The power allocation factor for matching each user of centering is determined according to the power distribution pattern matrix, and the down transmitting power of each user is determined according to the power allocation factor.Under conditions of consideration user fairness, PDMA technology can be that user distributes different PDMA pattern set of vectors and power according to the position of user, the difference of encoding domain and power domain is made full use of to be received, reach and promotes that cell is average and edge customer spectrum efficiency, the purpose of raising cell access customer number.
Description
Technical field
The present invention relates to the technology of long evolving system, particularly relates to a kind of method, apparatus of allocation of downlink power and be
System.
Background technique
With traditional time division multiple acess (TDMA, Time Division Multiple Access), frequency division multiple access (FDMA,
Frequency Division Multiple Access), CDMA (CDMA, Code Division Multiple
Access) access technology is similar, and pattern divides multiple access and accesses (PDMA, Patten Division Multiple Access) skill
Key technology of the art as 5G can make multi-user in identical time-frequency domain, airspace transmitted over resources, and by encoding domain and
Power carries out the differentiation between user, and raising cell is averaged and edge customer spectrum efficiency, and promotes cell access customer number.
Long term evolution (LTE, Long Term Evolution) system down link uses power distributing technique, to guarantee
LTE has good forward compatibility, it is contemplated that the following 5G system down link will continue to use the technology.Due to PDMA can make it is more
User's superposed transmission on encoding domain and power domain, accordingly, there exist how to be multi-user in identical time-frequency domain and airspace resource
The problem of upper progress power distribution.
Traditional LTE downlink uses power distribution, power distribution determine downlink send each element of resource (RE,
Resource Element) energy.Firstly, descending power distribution needs to consider the demand of system covering, believe for downlink business
Road, broadcast channel, control channel and reference signal distribute suitable power, to meet the received signal quality of edge customer；Its
Secondary, descending power distribution should reduce down transmitting power as far as possible, to mitigate system interference.For downlink design, it is
The efficiency for guaranteeing power amplifier needs to guarantee different orthogonal frequency multiplexing technique (OFDM, Orthogonal as far as possible
Frequecy Devision Multiplexing) general power on symbol is consistent.The minimum of LTE downlink resource allocations is single
Position is Physical Resource Block (PRB, Physical Resource Block), according to the difference of each resource bearing user and fluxion,
Downlink transfer mode can be divided into single user list stream, single user multithread, multi-user's three classes.For single user single-stream transmission, often
Total down transmitting power on a PRB is down transmitting power of the user on the PRB, and for single user multithread or more
User is transmitted, and total down transmitting power on each PRB averagely will give each stream or user, with lifting system handling capacity
Energy.
The prior art has the following problems: traditional LTE system downlink power allocation is although it is contemplated that the position of user
Characteristic configures different power distribution parameters for different user, to promote the communication performance of edge customer, it is also considered that by power
It is averagely allocated to multithread or multi-user transmission, but the distribution of LTE descending power does not still make full use of encoding domain and power domain
Characteristic.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of methods, devices and systems of allocation of downlink power, solve existing
There is LTE descending power in technology to distribute the defect for still not making full use of the characteristic of encoding domain and power domain.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of method of allocation of downlink power, it is applied to base
It stands, method includes: the position according to user in cell, determines the user for needing to match；It determines PDMA pattern matrix, is every
A user distributes different PDMA pattern set of vectors, forms power distribution pattern matrix according to the PDMA pattern set of vectors；Root
According to the power distribution pattern matrix determine one match each user of centering power allocation factor, according to the power distribution because
Son determines the down transmitting power of each user.
The method determines PDMA pattern matrix, different PDMA pattern set of vectors is distributed for each user, according to institute
It states PDMA pattern set of vectors formation power distribution pattern matrix to specifically include: according to the total money of the total number of users of cell and system
The PDMA pattern matrix H of PDMA downlink is selected in sourcePDMA(M*N), M is the line number of PDMA pattern matrix, and N is PDMA pattern matrix
Columns；Using PDMA pattern matrix and power allocation factor matrixIt calculates every
The PDMA pattern set of vectors of a user forms power distribution pattern matrixK indicates the user of downlink pairing
Number, N1,N2,…,NKThe user 1,2 ... of pairing is respectively indicated, K occupies PDMA pattern matrix column number, and N=N1+N2+…+
NK, A1,A2,…,AKRespectively indicate user 1,2 ..., the power distribution pattern set of vectors of K,Dot product between representing matrix.
The method, according to the power distribution pattern matrix determine the power distribution with each user of centering because
Son specifically includes: selected descending power distributes prioritization scheme；The PDMA pattern set of vectors current for each user and power
Distribution factor combines, and is according to the maximum criterion of PF weighted sum handling capacityAnd meet | | A | |1=1 is adjusted, and matches multi-user
PF weighted sum handling capacity later is maximum, wherein Tk(SINRk,A) indicate biography of the user k when power distribution pattern matrix is A
Defeated rate, by user k SINR and occupy the obtained transmitted bit number of resource impact and calculate, the SINR value of user k and
Power allocation factor in PDMA pattern matrix is related, BLERk(SINRk,A) indicate user k power distribution pattern matrix be A
When the Block Error Rate estimated, obtained by SINR and BLER mapping relations,Indicate user k t moment history Mean Speed, |
|A||1=1 indicates that down transmitting power is constant, | | | |1It indicates to sum to the element of power distribution pattern matrix；For any
User k, history Mean Speed calculation formula are Indicate the system at the current time of user k
Obtained history Mean Speed is counted,The history Mean Speed that the expression user k last time counts, Rk(t) it indicates to use
The present rate of family k, α indicate forgetting factor, when value be 1 when, indicate PF weighted sum handling capacity only with user's present rate phase
It closes.
The method, according to the power distribution pattern matrix determine the power distribution with each user of centering because
Son further include: selected descending power distributes the simplified mode；It is distinguished far by reference to signal reception power or reference signal SINR
End subscriber and near-end user；For remote subscriber distribute the first power, for near-end user distribute the second power, first power and
Second power corresponds to power allocation factor, and the first power is greater than the second power.
The method, according to the power distribution pattern matrix determine the power distribution with each user of centering because
Son comprises determining that power allocation factor of each user in PDMA pattern matrix on each PDMA pattern vector is equal；And really
The power allocation factor of fixed each user each row in each PDMA pattern vector in PDMA pattern matrix.
A kind of device of allocation of downlink power, comprising: pairing unit is determined for the position according to user in cell
The user for needing to match；Power distribution pattern matrix unit is distributed different for determining PDMA pattern matrix for each user
PDMA pattern set of vectors forms power distribution pattern matrix according to PDMA pattern set of vectors；Down transmitting power unit is used for root
According to the power distribution pattern matrix determine one match each user of centering power allocation factor, according to the power distribution because
Son determines the down transmitting power of each user.
The device, power distribution pattern matrix unit includes: PDMA pattern matrix module, for selecting PDMA downlink
PDMA pattern matrix HPDMA(M*N), M is the line number of PDMA pattern matrix, and N is PDMA pattern matrix column number；Power distribution
Pattern matrix chosen module, for using PDMA pattern matrix and power allocation factor matrixThe PDMA pattern set of vectors of each user is calculated, power distribution pattern square is formed
Battle arrayK indicates the use of downlink pairing
Amount, N1,N2,…,NKThe user 1,2 ... of pairing is respectively indicated, K occupies PDMA pattern matrix column number, and N=N1+N2+…+
NK, A1,A2,…,AKRespectively indicate user 1,2 ..., the power distribution pattern set of vectors of K,Dot product between representing matrix.
The device, down transmitting power unit include: downlink mode chosen module, for selecting descending power distribution
Optimizing Mode；Optimizing Mode module, for the PDMA pattern set of vectors and power allocation factor group current for each user
It closes, is according to the maximum criterion of PF weighted sum handling capacityAnd
Meet | | A | |1=1 is adjusted, and the PF weighted sum handling capacity after matching multi-user is maximum, wherein Tk(SINRk,A) indicate
Transmission rate of the user k when power distribution pattern matrix is A, the transmission obtained by the SINR and occupancy resource impact of user k
Bit number calculates, and the SINR value of user k is related to the power allocation factor in PDMA pattern matrix, BLERk
(SINRk,A) indicate the Block Error Rate that user k is estimated when power distribution pattern matrix is A, it is obtained by SINR and BLER mapping relations
It arrives,Indicate user k t moment history Mean Speed, | | A | |1=1 indicates that down transmitting power is constant, | | | |1Table
Show the element summation to power distribution pattern matrix；For any user k, history Mean Speed calculation formula is Indicate the history Mean Speed that the statistics at the current time of user k obtains,
The history Mean Speed that the expression user k last time counts, Rk(t) indicate user k present rate, α indicate forget because
Son indicates that PF weighted sum handling capacity is only related to user's present rate when value is 1.
The device, down transmitting power unit include: the downlink mode chosen module, are also used to selected downlink function
Rate distributes the simplified mode；The simplified mode module is used for distinguishing distal end by reference to signal reception power or reference signal SINR
Family and near-end user；The first power is distributed for remote subscriber, near-end user distributes the second power；Traverse all multi-user's power
Distribution factor combination, determines the power allocation factor between user.
The device, the simplified mode module include: column count module, for determining each user in PDMA pattern square
The power allocation factor of battle array Nei Gelie；Transmission power module, for guaranteeing each user on the basis of determining user's general power
PDMA pattern rectangular array between total down transmitting power it is equal.
A kind of system of allocation of downlink power, comprising: base station, receiving end；The base station includes a kind of allocation of downlink power
Device, device includes: pairing unit, for the position according to user in cell, determines the user for needing to match；Power point
With pattern matrix unit, for determining PDMA pattern matrix, different PDMA pattern set of vectors is distributed for each user, according to
PDMA pattern set of vectors forms power distribution pattern matrix；Down transmitting power unit, for according to the power distribution pattern
Matrix determines the power allocation factor for matching each user of centering, is determined under each user according to the power allocation factor
Row transmission power；Receiving end receives machine testing using least mean-square error for being used as remote subscriber；As near-end user, make
Machine testing is received with serial interference elimination, first the interference of remote subscriber is deleted, then detects own signal again.
The advantageous effects of the above technical solutions of the present invention are as follows: PDMA technology can under conditions of considering user fairness
To be that user distributes different PDMA pattern set of vectors and power according to the position of user, encoding domain and power domain are made full use of
Difference is received, and is reached and is promoted that cell is average and edge customer spectrum efficiency, the purpose of raising cell access customer number.
Detailed description of the invention
The flow diagram for the method for allocation of downlink power that Fig. 1 shows a kind of in LTE system；
Fig. 2 indicates that PDMA technology is applied to the implementation process that LTE downlink carries out power distribution；
The implementation of Fig. 3 expression descending power the simplified mode.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
PDMA is multi-purpose by designing using the asymmetry of multiuser channel as novel non-orthogonal multiple access technology
The sparse coding matrix and coded modulation combined optimization mode of the family diversity such as not, realize time-frequency domain, code domain, power domain and airspace etc.
The non-orthogonality signal superposed transmission of various dimensions, i.e., mapped on multidimensional signal domain, forms the non-orthogonal codes of dividing multi-user
This pattern, to obtain higher multiuser multiplexing and diversity gain.The design philosophy of this technology is: code domain being superimposed and is passed
Defeated, multi-user is distinguished on identical running time-frequency resource using PDMA pattern matrix column；It is more for power domain superposed transmission
User is distinguished on identical running time-frequency resource using different transmission powers；For airspace superposed transmission, multi-user is in phase
It is distinguished on running time-frequency resource using data flow different in space.
The embodiment of the present invention is for downlink without the concern for power consumption, and therefore, target is the power distribution of determining user
The factor.For downlink, it is proximal end (being located at central area) that PDMA, which can be that edge customer distributes the first power in transmitting terminal,
User distributes the second power, and both allow be added to identical time-frequency, transmitted in the resource of airspace.The present invention provides PDMA
Power distributing technique when applied to LTE system downlink, design philosophy are as follows: under conditions of considering user fairness, close
Reason ground carries out power distribution between a plurality of users, to reduce the interference between user.
It is different user's distribution powers in order to which PDMA is applied to LTE downlink, the embodiment of the present invention provides one kind
The method of allocation of downlink power in LTE system is applied to base station, as shown in Figure 1, method includes:
Step 101, the position according to user in cell determines the user for needing to match；
Step 102, it determines PDMA pattern matrix, different PDMA pattern set of vectors is distributed for each user, according to PDMA
Pattern set of vectors forms power distribution pattern matrix；
Step 103, the power allocation factor for matching each user of centering is determined according to power distribution pattern matrix A, it is defeated
The down transmitting power of each user out.
Using provided technology, under conditions of considering user fairness, PDMA technology can be according to the position of user
User distributes different PDMA pattern set of vectors and power, makes full use of the difference of encoding domain and power domain to be received, reaches
Promotion cell is averaged and edge customer spectrum efficiency, improves the purpose of cell access customer number.
One PDMA pattern matrix can support multiple users to match transmission, by taking typical 3,7PDMA pattern matrix as an example,
One column of PDMA pattern matrix are a PDMA pattern vectors, and downlink maximum can support 7 users to match transmission.Scheme in PDMA
In sample matrix, in, one PDMA pattern set of vectors of each user occupancy, a PDMA pattern set of vectors be can be
One or more columns per page in PDMA pattern matrix, power distribution pattern matrix A are equal with the ranks of PDMA pattern matrix.
During PDMA technology is applied to LTE downlink progress power distribution, key is in the same pairing
In user select power distribution pattern matrix A come realize optimal power ratio and determine user's down transmitting power.
In a preferred embodiment, it determines PDMA pattern matrix, distributes different PDMA pattern vectors for each user
Group forms power distribution pattern matrix according to the PDMA pattern set of vectors and specifically includes:
According to the total resource of the total number of users of cell and system, the PDMA pattern matrix H of PDMA downlink is selectedPDMA(M*N),
M is the line number of PDMA pattern matrix, and N is PDMA pattern matrix column number；
Using PDMA pattern matrix and power allocation factor matrixDot product meter
The PDMA pattern set of vectors of each user is calculated, power distribution pattern matrix is formedK indicates the user of downlink pairing
Number, N1,N2,…,NKThe user 1,2 ... of pairing is respectively indicated, K occupies PDMA pattern matrix column number, and N=N1+N2+…+
NK, A1,A2,…,AKRespectively indicate user 1,2 ..., the power distribution pattern set of vectors of K,Dot product between representing matrix.
During PDMA technology is applied to LTE downlink progress power distribution, according to selection power distribution pattern
The difference of matrix A and the complexity of determining user's down transmitting power, there are Optimizing Modes and the simplified mode for descending power distribution
Two kinds, in a preferred embodiment, during PDMA is applied to LTE downlink progress power distribution, using optimization mould
Formula.The user for traversing each pairing, it is the location of in the cell different according to the user of pairing, it is the PDMA pattern of each user
Set of vectors distributes all power allocation factors that may be different, direct ratio (PF, Proportional after matching user
Fair) weighted sum handling capacity is maximum.Power distribution pattern matrix A is corresponding with PDMA pattern matrix, power allocation factor and PDMA
Pattern set of vectors is corresponding, and a PDMA pattern set of vectors can be the one or more columns per page of PDMA pattern matrix, power allocation factor
Refer to the sum of PDMA pattern set of vectors element.
Then during this, the power with each user of centering point is determined according to the power distribution pattern matrix A
It is specifically included with the factor:
Selected descending power distributes prioritization scheme；
The PDMA pattern set of vectors current for each user and power allocation factor combination, gulp down according to PF weighted sum
The maximum criterion of the amount of spitting isAnd meet | | A | |1=1 carries out
Adjustment, the PF weighted sum handling capacity after matching multi-user are maximum, wherein Tk(SINRk,A) indicate user k in power distribution
Transmission rate when pattern matrix is A, from the transmitted bit number calculating that the SINR and occupancy resource impact of user k are obtained,
The SINR value of user k is related to the power allocation factor in PDMA pattern matrix, BLERk(SINRk,A) indicate user k in function
The Block Error Rate that rate distribution pattern matrix is estimated when being A, is obtained by SINR and BLER mapping relations,Indicate user k in t moment
History Mean Speed, | | A | |1=1 indicates that down transmitting power is constant, | | | |1Indicate the member to power distribution pattern matrix
Element summation；
For any user k, history Mean Speed calculation formula is It indicates to use
The history Mean Speed that the statistics at the current time of family k obtains,Indicate that the history that the user k last time counts is average
Rate, Rk(t) present rate of user k is indicated, α indicates forgetting factor, when value is 1, indicates PF weighted sum handling capacity only
It is related to user's present rate.
In an application scenarios, as shown in Fig. 2, PDMA technology is applied to LTE downlink, distributed based on Optimizing Mode
The process of descending power includes:
Step 201, the position according to user in cell determines the user for needing to match.
Step 202, according to the total resources of total number of users in cell and system, PDMA pattern matrix is determined.PDMA pattern
Matrix be after having determined it is fixed, do not change, therefore, the PDMA pattern vector in PDMA pattern matrix is also not send out
Raw change.
Step 203, according to power allocation factor matrixFor each user point
With from PDMA pattern set of vectors different before, according to PDMA pattern set of vectors formed power distribution pattern matrix, and, according to
Power distribution pattern matrix determines the down transmitting power of each user.There has been described primary distribution PDMA pattern set of vectors and
The situation of power allocation factor redistributes the distribution of different PDMA pattern set of vectors and power allocation factor and first time
Process is identical, wherein power allocation factor matrix is variation in adjustment each time.
Step 204, the PF weighted sum handling capacity after multi-user's pairing is calculated.
Step 205, judge whether current PF weighted sum handling capacity is maximum compared with PF weighted sum handling capacity before, if
Current PF weighted sum handling capacity is not maximum compared with result before, then return step 203, if current PF weighted sum
Handling capacity is maximum, goes to step 206；
Step 206, the different PDMA pattern set of vectors and power allocation factor of the user by all pairings of above-mentioned traversal
Combination, if having found makes the maximum combination of PF weighted sum handling capacity, exports the down transmitting power of each user at this time.
Under Optimizing Mode, when searching optimal power distribution pattern matrix, selection pairing user is first had to, is then pairing
User distributes different power allocation factor matrixes, and obtains power distribution pattern matrix in conjunction with PDMA pattern matrix, further
Determining the power distribution pattern matrix, whether PF weighted sum handling capacity is maximum, until finding so that PF weighted sum handling capacity is maximum
Power distribution pattern matrix.
Since total down transmitting power during downlink is limited, to further decrease PDMA technology applied to LTE downlink
Link carries out the complexity of power distribution, and the design philosophy of descending power distribution the simplified mode is to guarantee that each user has divided at it
Down transmitting power in each column with PDMA pattern set of vectors is equal.In a preferred embodiment, allocation of downlink emits function
The simplified mode of rate includes:
Remote subscriber and near-end user are distinguished by reference to signal reception power or reference signal SINR；For remote subscriber point
With the first power, near-end user distributes the second power, and the first power is greater than the second power；
The PDMA pattern set of vectors and power allocation factor combination for traversing all users, determine the power distribution of user because
Son, this includes: to determine each user in the function of PDMA pattern matrix Nei Gelie on the basis of determination total down transmitting power
Rate distribution factor is equal.
On the basis of determining each column power allocation factor of each user, due to PDMA technology respectively arrange in every row element hair
Identical information is sent, therefore, it is necessary to guarantee that power allocation factor of each user in each column on each row is equal, therefore it is excellent at one
It selects in embodiment, further includes: determine the power allocation factor of each user each row in each column in PDMA pattern matrix.
In an application scenarios, set the total down transmitting power of downlink as 1, the user matched there are two: first uses
Family and second user, as shown in figure 3, for PDMA pattern matrix [3,7], PDMA pattern matrix isFirst user is located at cell edge, occupies the 2nd~4 column of PDMA pattern matrix, second user
Positioned at center of housing estate, the 5th~7 column of PDMA pattern matrix are occupied.The simplified mode is used to distribute for the first user and second user
Descending power includes:
Step 1, the first user is located at cell edge, therefore, distributes the first power 0.8, and second user is located in cell
The heart distributes the second power 0.2；
Step 2, due to the first user and each Zhan Sanlie of second user, the power of the first user Ge Lie is 0.8/
3, the power that second user respectively arranges is 0.2/3；
Step 3, due to PDMA technology respectively arrange in every row element power allocation factor it is equal, in the first user Ge Lie
The power allocation factor average out to 0.8/3/2 of every row element, second user respectively arrange in the power allocation factor of every row element be
0.2/3/1。
In a preferred embodiment, further includes: step 104, multiple users are real on identical time-frequency domain and airspace
Existing superposed transmission.Power distribution is reasonably carried out between remote subscriber and near-end user, PDMA is equivalent to multi-user in power
Superposed transmission on domain, from system perspective, after multi-user's superposed transmission, the scheduling times of each user increase, and edge
User influences very little since power reduces bring, cell is average and edge customer spectrum efficiency will obtain greatly
It is promoted.
In power distributing technique when PDMA provided by the invention is applied to LTE system downlink, no matter for optimization
Mode or the simplified mode, in a preferred embodiment, in receiving end, for remote subscriber, using least mean-square error
(MMSE, Minimum Mean Square Error) receives machine testing；
For near-end user, serial interference elimination (SIC, Successive Interference is used
Cancellation) reception mechanism detects；First the interference of remote subscriber is deleted, then detects own signal again.
In receiving end, since edge customer power is higher, least mean-square error (MMSE, Minimum Mean can be used
Square Error) machine testing is received, and successive interference cancellation (SIC, Successive then can be used in central user
Interference Cancellation) reception mechanism detection, the edge customer of the first power transmission is first deleted, is then examined again
Survey own signal.Encoding domain and power domain characteristic can be made full use of in this way, and increase is adjusted simultaneously in identical time-frequency, airspace resource
The number of users of degree, and then promote cell and averagely improved with edge customer spectrum efficiency, the spectrum efficiency of raising cell accessing user
Cell access customer number.
The embodiment of the present invention provides a kind of device of allocation of downlink power in LTE system, comprising:
Pairing unit determines the user for needing to match for the position according to user in cell；
Power distribution pattern matrix unit distributes different PDMA figures for each user for determining PDMA pattern matrix
Sample set of vectors forms power distribution pattern matrix A according to PDMA pattern set of vectors；
A down transmitting power unit, for determining that is matched each user of centering according to the power distribution pattern matrix A
Power allocation factor, the down transmitting power of each user is determined according to the power allocation factor.
In a preferred embodiment, power distribution pattern matrix unit includes:
PDMA pattern matrix module, for selecting the PDMA pattern matrix H of PDMA downlinkPDMA(M*N), M is PDMA pattern
The line number of matrix, N are PDMA pattern matrix column numbers；
Power distribution pattern matrix chosen module, for using PDMA pattern matrix and power allocation factor matrixThe PDMA pattern set of vectors of each user is calculated, power distribution pattern square is formed
Battle arrayK indicates the use of downlink pairing
Amount, N1,N2,…,NKThe user 1,2 ... of pairing is respectively indicated, K occupies PDMA pattern matrix column number, and N=N1+N2+…
+NK, A1,A2,…,AKRespectively indicate user 1,2 ..., the power distribution pattern set of vectors of K,Dot product between representing matrix.
In a preferred embodiment, power distribution pattern matrix unit includes:
Downlink mode chosen module, for selecting descending power distribution Optimizing Mode；
Optimizing Mode module, for the PDMA pattern set of vectors and power allocation factor group current for each user
It closes, is according to the maximum criterion of PF weighted sum handling capacityAnd
Meet | | A | |1=1 is adjusted, and the PF weighted sum handling capacity after matching multi-user is maximum, wherein Tk(SINRk,A) indicate
Transmission rate of the user k when power distribution pattern matrix is A, the transmission obtained by the SINR and occupancy resource impact of user k
Bit number calculates, and the SINR value of user k is related to the power allocation factor in PDMA pattern matrix, BLERk
(SINRk,A) indicate the Block Error Rate that user k is estimated when power distribution pattern matrix is A, it is obtained by SINR and BLER mapping relations
It arrives,Indicate user k t moment history Mean Speed, | | A | |1=1 indicates that down transmitting power is constant, | | | |1Table
Show the element summation to power distribution pattern matrix；
For any user k, history Mean Speed calculation formula is It indicates to use
The history Mean Speed that the statistics at the current time of family k obtains,Indicate that the history that the user k last time counts is average
Rate, Rk(t) present rate of user k is indicated, α indicates forgetting factor, when value is 1, indicates PF weighted sum handling capacity only
It is related to user's present rate.
In a preferred embodiment, power distribution pattern matrix unit includes:
Downlink mode chosen module, for selecting descending power distribution the simplified mode；
The simplified mode module, for distinguishing remote subscriber and proximal end by reference to signal reception power or reference signal SINR
User；The first power is distributed for remote subscriber, near-end user distributes the second power；Traverse all multi-user's power allocation factors
Combination, determines the power allocation factor between user.
In a preferred embodiment, the simplified mode module includes:
Column count module, for determining each user in the power allocation factor of PDMA pattern matrix Nei Gelie；
Transmission power module, on the basis of determining user's general power, guaranteeing the PDMA pattern matrix of each user
Total down transmitting power is equal between column.
The embodiment of the present invention provides a kind of system of allocation of downlink power, comprising: base station, receiving end；The base station includes
A kind of device of allocation of downlink power, device include:
Pairing unit determines the user for needing to match for the position according to user in cell；
Power distribution pattern matrix unit distributes different PDMA figures for each user for determining PDMA pattern matrix
Sample set of vectors forms power distribution pattern matrix according to PDMA pattern set of vectors；
Down transmitting power unit, for determining that one is matched each user's of centering according to the power distribution pattern matrix
Power allocation factor determines the down transmitting power of each user according to the power allocation factor；
Receiving end receives machine testing using least mean-square error for being used as remote subscriber；As near-end user, use
Serial interference elimination receives machine testing, first deletes the interference of remote subscriber, then detects own signal again.
It is using the advantage after this programme: in multiuser downstream transmission process, using PDMA technology in encoding domain and function
Rate distinguishes on domain, carries out superposed transmission in identical time-frequency domain, airspace resource, by reasonable allocation of downlink power,
Cell access customer number can be not only promoted, but also effectively increases that cell is average and edge customer spectrum efficiency.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of method of allocation of downlink power, it is applied to base station, which is characterized in that method includes:
According to position of the user in cell, the user for needing to match is determined；
It determines PDMA pattern matrix, different PDMA pattern set of vectors is distributed for each user, according to the PDMA pattern vector
Group forms power distribution pattern matrix；Wherein PDMA is that pattern divides multiple access access；
The power allocation factor for matching each user of centering is determined according to the power distribution pattern matrix, according to the power
Distribution factor determines the down transmitting power of each user；
Different PDMA pattern set of vectors is distributed for each user, and power distribution pattern is formed according to the PDMA pattern set of vectors
Matrix specifically includes:
According to the total resource of the total number of users of cell and system, the PDMA pattern matrix H of PDMA downlink is selectedPDMA(M*N), M is
The line number of PDMA pattern matrix, N are PDMA pattern matrix column numbers；
Using PDMA pattern matrix and power allocation factor matrixIt calculates each
The PDMA pattern set of vectors of user forms power distribution pattern matrixK indicates the user of downlink pairing
Number, N1,N2,…,NKThe user 1,2 ... of pairing is respectively indicated, K occupies PDMA pattern matrix column number, and N=N1+N2+…+
NK, A1,A2,…,AKRespectively indicate user 1,2 ..., the power distribution pattern set of vectors of K,Dot product between representing matrix.
2. the method according to claim 1, wherein determining a pairing according to the power distribution pattern matrix
In the power allocation factor of each user specifically include:
Selected descending power distributes prioritization scheme；
The PDMA pattern set of vectors current for each user and power allocation factor combination, most according to PF weighted sum handling capacity
Big criterion isAnd meet | | A | |1=1 is adjusted, and makes
PF weighted sum handling capacity after multi-user's pairing is maximum, wherein Tk(SINRk,A) indicate user k in power distribution pattern matrix
Transmission rate when for A, by user k SINR and occupy from the transmitted bit number that resource impact obtains calculates, user k's
SINR value is related to the power allocation factor in PDMA pattern matrix, BLERk(SINRk,A) indicate user k in power distribution figure
The Block Error Rate that sample matrix is estimated when being A, is obtained by SINR and BLER mapping relations,Indicate that user k is flat in the history of t moment
Equal rate, | | A | |1=1 indicates that down transmitting power is constant, | | | |1It indicates to sum to the element of power distribution pattern matrix；
For any user k, history Mean Speed calculation formula is Indicate user k's
The history Mean Speed that the statistics at current time obtains,The history Mean Speed that the expression user k last time counts,
Rk(t) indicate user k present rate, α indicate forgetting factor, when value be 1 when, indicate PF weighted sum handling capacity only with user
Present rate is related.
3. the method according to claim 1, wherein determining a pairing according to the power distribution pattern matrix
In each user power allocation factor further include:
Selected descending power distributes the simplified mode；
Remote subscriber and near-end user are distinguished by reference to signal reception power or reference signal SINR；
The first power is distributed for remote subscriber, distributes the second power for near-end user, first power and the second power are right
Power allocation factor is answered, and the first power is greater than the second power.
4. according to the method described in claim 3, it is characterized in that, determining a pairing according to the power distribution pattern matrix
In the power allocation factor of each user include:
Determine that power allocation factor of each user in PDMA pattern matrix on each PDMA pattern vector is equal；
And determine the power allocation factor of each user each row in each PDMA pattern vector in PDMA pattern matrix.
5. a kind of device of allocation of downlink power characterized by comprising
Pairing unit determines the user for needing to match for the position according to user in cell；
Power distribution pattern matrix unit distributes different PDMA pattern arrows for each user for determining PDMA pattern matrix
Amount group forms power distribution pattern matrix according to PDMA pattern set of vectors；
Down transmitting power unit, for determining the power for matching each user of centering according to the power distribution pattern matrix
Distribution factor determines the down transmitting power of each user according to the power allocation factor；Wherein PDMA is that pattern segmentation is more
Location access；
Power distribution pattern matrix unit includes:
PDMA pattern matrix module, for selecting the PDMA pattern matrix H of PDMA downlinkPDMA(M*N), M is PDMA pattern matrix
Line number, N are PDMA pattern matrix column numbers；
Power distribution pattern matrix chosen module, for using PDMA pattern matrix and power allocation factor matrixThe PDMA pattern set of vectors of each user is calculated, power distribution pattern square is formed
Battle arrayK indicates the use of downlink pairing
Amount, N1,N2,…,NKThe user 1,2 ... of pairing is respectively indicated, K occupies PDMA pattern matrix column number, and N=N1+N2+…+
NK, A1,A2,…,AKRespectively indicate user 1,2 ..., the power distribution pattern set of vectors of K,Dot product between representing matrix.
6. device according to claim 5, which is characterized in that down transmitting power unit includes:
Downlink mode chosen module, for selecting descending power distribution Optimizing Mode；
Optimizing Mode module combines, root for the PDMA pattern set of vectors current for each user and power allocation factor
It is according to the maximum criterion of PF weighted sum handling capacityAnd meet |
|A||1=1 is adjusted, and the PF weighted sum handling capacity after matching multi-user is maximum, wherein Tk(SINRk,A) indicate user k
Transmission rate when power distribution pattern matrix is A, the transmitted bit number obtained by the SINR and occupancy resource impact of user k
It calculates, the SINR value of user k is related to the power allocation factor in PDMA pattern matrix, BLERk(SINRk,A) indicate
The Block Error Rate that user k is estimated when power distribution pattern matrix is A, is obtained by SINR and BLER mapping relations,It indicates to use
Family k t moment history Mean Speed, | | A | |1=1 indicates that down transmitting power is constant, | | | |1It indicates to power distribution figure
The element of sample matrix is summed；
For any user k, history Mean Speed calculation formula is Indicate user k's
The history Mean Speed that the statistics at current time obtains,The history Mean Speed that the expression user k last time counts,
Rk(t) indicate user k present rate, α indicate forgetting factor, when value be 1 when, indicate PF weighted sum handling capacity only with user
Present rate is related.
7. device according to claim 6, which is characterized in that down transmitting power unit includes:
The downlink mode chosen module is also used to selected descending power distribution the simplified mode；
The simplified mode module, for distinguishing remote subscriber and proximal end use by reference to signal reception power or reference signal SINR
Family；The first power is distributed for remote subscriber, near-end user distributes the second power；Traverse all multi-user's power allocation factor groups
It closes, determines the power allocation factor between user.
8. device according to claim 7, which is characterized in that the simplified mode module includes:
Column count module, for determining each user in the power allocation factor of PDMA pattern matrix Nei Gelie；
Transmission power module, between the PDMA pattern rectangular array on the basis of determining user's general power, guaranteeing each user
Total down transmitting power is equal.
9. a kind of system of allocation of downlink power, comprising: base station and receiving end；The base station includes a kind of allocation of downlink power
Device, device include:
Pairing unit determines the user for needing to match for the position according to user in cell；
Power distribution pattern matrix unit distributes different PDMA pattern arrows for each user for determining PDMA pattern matrix
Amount group forms power distribution pattern matrix according to PDMA pattern set of vectors；Wherein PDMA is that pattern divides multiple access access；
Down transmitting power unit, for determining the power for matching each user of centering according to the power distribution pattern matrix
Distribution factor determines the down transmitting power of each user according to the power allocation factor；
Receiving end receives machine testing using least mean-square error for being used as remote subscriber；As near-end user, using serial
Interference cancellation receiver detection, the interference of remote subscriber is first deleted, then detect own signal again；
Wherein, power distribution pattern matrix unit includes:
PDMA pattern matrix module, for selecting the PDMA pattern matrix H of PDMA downlinkPDMA(M*N), M is PDMA pattern matrix
Line number, N are PDMA pattern matrix column numbers；
Power distribution pattern matrix chosen module, for using PDMA pattern matrix and power allocation factor matrixThe PDMA pattern set of vectors of each user is calculated, power distribution pattern square is formed
Battle arrayK indicates the use of downlink pairing
Amount, N1,N2,…,NKThe user 1,2 ... of pairing is respectively indicated, K occupies PDMA pattern matrix column number, and N=N1+N2+…+
NK, A1,A2,…,AKRespectively indicate user 1,2 ..., the power distribution pattern set of vectors of K,Dot product between representing matrix.
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