CN106658694A - Method, device and system for distributing downlink power - Google Patents

Abstract

An embodiment of the invention provides a method, a device and a system for distributing downlink power. The method comprises the steps of defining a user which requires pairing according to positions of users in a cell; defining a PDMA pattern matrix, distributing different PDMA pattern vector groups for each user, and forming a power distribution pattern matrix according to the PDMA pattern vector group; defining a power distribution factor of each user in one pair according to the power distribution pattern matrix, and defining the downlink transmitting power of each user according to the power distribution factor. On the condition that user fairness is considered, different PDMA pattern vector groups and powers can be distributed to the users according to the positions of the users through PDMA technology, and difference between a coding domain and a power domain is sufficiently used for receiving, thereby improving average and edge user spectrum effectiveness of the cell and increasing number of accessing users of the cell.

Description

A kind of methods, devices and systems of allocation of downlink power

Technical field

The present invention relates to the technology of long evolving system, particularly relates to a kind of method of allocation of downlink power, dress Put and system.

Background technology

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 be similar to, pattern segmentation multiple access access (PDMA, Patten Division Multiple Access) technology as 5G key technology, can cause multi-user identical time-frequency domain, Spatial domain transmitted over resources, and the differentiation between user is carried out by encoding domain and power, improve cell it is average and Edge customer spectrum efficiency, and lift cell access customer number.

Long Term Evolution (LTE, Long Term Evolution) system down link adopts power distributing technique, is Ensure that LTE has good forward compatibility, it is contemplated that following 5G system down links will continue to use the technology. Because PDMA can make multi-user's superposed transmission on encoding domain and power domain, accordingly, there exist and how to be Multi-user carries out the problem of power distribution on identical time-frequency domain and spatial domain resource.

Traditional LTE downlinks adopt power distribution, power distribution to determine that descending each resource of transmission will The energy of plain (RE, Resource Element).First, descending power distribution needs what consideration system was covered Demand, is that downlink traffic channel, broadcast channel, control channel and reference signal distribute suitable power, with Meet the received signal quality of edge customer；Secondly, descending power distribution should try one's best and reduce down transmitting power, To mitigate system interference.It is the efficiency for ensureing power amplifier for downlink design, needs to the greatest extent Amount ensures different orthogonal frequency multiplexing technique (OFDM, Orthogonal Frequecy Devision Multiplexing the general power) on symbol is consistent.The least unit of LTE downlink resource allocations is physics Resource Block (PRB, Physical Resource Block), according to each resource bearing user and the difference of fluxion, Downlink transfer pattern can be divided into single user single current, single user multithread, the class of multi-user three.For single user single current For transmission, the total down transmitting power on each PRB is downlink of the user on the PRB Power, and for single user multithread or multi-user transmission, the total down transmitting power on each PRB will Each stream or user are averagely given, with lift system throughput performance.

There are the following problems for prior art：Traditional LTE system downlink power allocation is although it is contemplated that use The position characteristic at family, is that different user configures different power distribution parameters, to lift the communication of edge customer Performance, it is also considered that power averaging is distributed to into multithread or multi-user transmission, but LTE descending powers divide With the characteristic for still not making full use of encoding domain and power domain.

The content 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 the characteristic that LTE descending powers distribution in prior art does not still make full use of encoding domain and power domain Defect.

To solve above-mentioned technical problem, embodiments of the invention provide a kind of method of allocation of downlink power, should For base station, method includes：Position according to user in cell, it is determined that needing the user of pairing；It is determined that PDMA pattern matrixes, are that each user distributes different PDMA pattern set of vectors, according to the PDMA Pattern set of vectors forms power distribution pattern matrix；One pairing is determined according to the power distribution pattern matrix In each user power allocation factor, the downlink of each user is determined according to the power allocation factor Power.

Described method, determines PDMA pattern matrixes, is that each user distributes different PDMA patterns Set of vectors, forms power distribution pattern matrix and specifically includes according to the PDMA patterns set of vectors：According to The total resource of the total number of users of cell and system, selectes the descending PDMA pattern matrixes of PDMA H_PDMA(M*N), M is the line number of PDMA pattern matrixes, and N is PDMA pattern matrix column numbers；Adopt With PDMA patterns matrix and power allocation factor matrixCalculate every The PDMA pattern set of vectors of individual user, forms power distribution pattern matrixK represents the use of descending pairing Amount, N₁,N₂,…,N_KThe user 1,2 ... of pairing is represented respectively, and K takes PDMA pattern matrix column numbers, And N=N₁+N₂+…+N_K, A₁,A₂,…,A_KRespectively represent user 1,2 ..., the power distribution pattern set of vectors of K, Dot product between representing matrixs.

Described method, according to the power distribution pattern matrix power with each user of centering is determined Distribution factor is specifically included：Selected descending power distributes prioritization scheme；It is current for each user PDMA patterns set of vectors and power allocation factor are combined, and are according to the criterion that PF weighted sums handling capacity is maximumAnd satisfaction | | A | |₁=1 is adjusted, and matches somebody with somebody multi-user PF weighted sums handling capacity to after is maximum, wherein, T_k(SINR_k,A) represent user k in power distribution pattern Transfer rate when matrix is A, the transmitted bit number obtained by the SINR and occupancy esource impact of user k Calculate, the SINR values of user k are related to the power allocation factor in PDMA pattern matrixes, BLER_k(SINR_k,A) represent user k Block Error Rates for estimating when power distribution pattern matrix is A, by SINR and BLER mapping relations are obtained,Represent history Mean Speeds of the user k in t, | | A | |₁Under=1 represents Row transmission power is constant, | | | |₁Represent that the element to power distribution pattern matrix is sued for peace；For any user k, History Mean Speed computing formula is Represent the current time of user k The history Mean Speed that statistics is obtained,The history Mean Speed that the last statistics of user k is obtained is represented, R_kT () represents the present rate of user k, α represents forgetting factor, when value is 1, represents PF weighted sums Handling capacity is only related to user's present rate.

Described method, according to the power distribution pattern matrix power with each user of centering is determined Distribution factor also includes：Selected descending power distributes the simplified mode；By reference to signal reception power or reference Signal SINR distinguishes remote subscriber and near-end user；Distribute the first power for remote subscriber, be that near-end is used The second power is distributed at family, and first power and the second power correspond to power allocation factor, and the first work( Rate is more than the second power.

Described method, according to the power distribution pattern matrix power with each user of centering is determined Distribution factor includes：Determine work(of each user on each PDMA patterns vector in PDMA pattern matrixes Rate distribution factor is equal；And, determine each user each PDMA patterns arrow in PDMA pattern matrixes The power allocation factor of each row in amount.

A kind of device of allocation of downlink power, including：Pairing unit, for the position according to user in cell Put, it is determined that needing the user of pairing；Power distribution pattern matrix unit, for determining PDMA pattern squares Battle array, is that each user distributes different PDMA pattern set of vectors, is formed according to PDMA pattern set of vectors Power distribution pattern matrix；Down transmitting power unit, for being determined according to the power distribution pattern matrix One power allocation factor with each user of centering, determines each user's according to the power allocation factor Down transmitting power.

Described device, power distribution pattern matrix unit includes：PDMA pattern matrix modules, are used for Selected PDMA descending PDMA pattern matrix Hs_PDMA(M*N), M is the row of PDMA pattern matrixes Number, N is PDMA pattern matrix column numbers；Power distribution pattern matrix chosen module, for adopting PDMA patterns matrix and power allocation factor matrixCalculate each The PDMA pattern set of vectors of user, forms power distribution pattern matrixK represents the use of descending pairing Amount, N₁,N₂,…,N_KThe user 1,2 ... of pairing is represented respectively, and K takes PDMA pattern matrix column numbers, And N=N₁+N₂+…+N_K, A₁,A₂,…,A_KRespectively represent user 1,2 ..., the power distribution pattern set of vectors of K, Dot product between representing matrixs.

Described device, down transmitting power unit includes：Downlink mode chosen module, it is descending for selecting Power distribution Optimizing Mode；Optimizing Mode module, for the PDMA pattern current for each user Set of vectors and power allocation factor are combined, and are according to the criterion that PF weighted sums handling capacity is maximumAnd satisfaction | | A | |₁=1 is adjusted, and matches somebody with somebody multi-user PF weighted sums handling capacity to after is maximum, wherein, T_k(SINR_k,A) represent user k in power distribution pattern Transfer rate when matrix is A, the transmitted bit number obtained by the SINR and occupancy esource impact of user k Calculate, the SINR values of user k are related to the power allocation factor in PDMA pattern matrixes, BLER_k(SINR_k,A) represent user k Block Error Rates for estimating when power distribution pattern matrix is A, by SINR and BLER mapping relations are obtained,Represent history Mean Speeds of the user k in t, | | A | |₁Under=1 represents Row transmission power is constant, | | | |₁Represent that the element to power distribution pattern matrix is sued for peace；For any user k, History Mean Speed computing formula is Represent the current time of user k The history Mean Speed that statistics is obtained,The history Mean Speed that the last statistics of user k is obtained is represented, R_kT () represents the present rate of user k, α represents forgetting factor, when value is 1, represents PF weighted sums Handling capacity is only related to user's present rate.

Described device, down transmitting power unit includes：The downlink mode chosen module, is additionally operable to choosing Fix row power distribution the simplified mode；The simplified mode module, for by reference to signal reception power or reference Signal SINR distinguishes remote subscriber and near-end user；Distribute the first power, near-end user point for remote subscriber With the second power；All of multi-user's power allocation factor combination is traveled through, the power distribution between user is determined The factor.

Described device, the simplified mode module includes：Column count module, for determining each user in PDMA The power allocation factor of pattern matrix Nei Gelie；Transmission power module, for it is determined that the base of user's general power On plinth, it is ensured that total down transmitting power is equal between the PDMA pattern rectangular arrays of each user.

A kind of system of allocation of downlink power, including：Base station, receiving terminal；The base station includes a kind of distribution The device of descending power, device includes：Pairing unit, for the position according to user in cell, it is determined that Need the user of pairing；Power distribution pattern matrix unit, is every for determining PDMA pattern matrixes Individual user distributes different PDMA pattern set of vectors, and according to PDMA patterns set of vectors power distribution is formed Pattern matrix；Down transmitting power unit, for determining a pairing according to the power distribution pattern matrix In each user power allocation factor, the downlink of each user is determined according to the power allocation factor Power；Receiving terminal, for as remote subscriber, using least mean-square error machine testing being received；As near-end User, using serial interference elimination machine testing is received, and first deletes the interference of remote subscriber, is then detected again Its own signal.

The above-mentioned technical proposal of the present invention has the beneficial effect that：Under conditions of considering user fairness, PDMA technologies can be the different PDMA patterns set of vectors of user's distribution and work(according to the position of user Rate, makes full use of encoding domain and the difference of power domain to be received, and reaches lifting cell averagely and edge customer Spectrum efficiency, improves the purpose of cell access customer number.

Description of the drawings

Fig. 1 represents a kind of schematic flow sheet of the method for the allocation of downlink power in LTE system；

Fig. 2 represents that what PDMA technologies were applied to that LTE downlinks carry out power distribution realizes flow process；

Fig. 3 represents the implementation of descending power the simplified mode.

Specific embodiment

To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with attached Figure and specific embodiment are described in detail.

PDMA, using the asymmetry of multiuser channel, leads to as new non-orthogonal multiple access technology The sparse coding matrix and coded modulation combined optimization pattern of the design multi-user diversity such as not are crossed, time-frequency is realized The non-orthogonality signal superposed transmission of the various dimensions such as domain, code domain, power domain and spatial domain, i.e., on multidimensional signal domain Mapped, formed the nonopiate code book pattern of dividing multi-user, to obtain higher multiuser multiplexing and divide Diversity gain.The design philosophy of this technology is：For code domain superposed transmission, multi-user provides in identical time-frequency Made a distinction using PDMA patterns matrix column on source；For power domain superposed transmission, multi-user exists Made a distinction using different transmission powers on identical running time-frequency resource；For spatial domain superposed transmission, multi-user Different data flows is making a distinction in utilization space on identical running time-frequency resource.

The embodiment of the present invention is directed to downlink without the concern for power consumption, therefore, target is to determine the work(of user Rate distribution factor.For downlink, PDMA can be that edge customer distributes the first power in transmitting terminal, Distribute the second power for near-end (be located at central area) user, and allow the two be added to identical time-frequency, spatial domain It is transmitted in resource.The invention provides power when PDMA is applied to LTE system downlink divides With technology, its design philosophy is：Under conditions of considering user fairness, reasonably enter between a plurality of users Row power distribution, to reduce the interference between user.

It is different user's distribution powers in order to PDMA is applied to into LTE downlinks, the present invention is implemented Example provides a kind of method of the 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, it is determined that needing the user of pairing；

Step 102, determines PDMA pattern matrixes, is that each user distributes different PDMA patterns arrows Amount group, according to PDMA patterns set of vectors power allocation factor is formed；

Step 103, according to power distribution pattern matrix A a power distribution with each user of centering is determined The factor, exports the down transmitting power of each user.

Using the technology for being provided, it is considered under conditions of user fairness, PDMA technologies can according to The position at family is the different PDMA patterns set of vectors of user's distribution and power, makes full use of encoding domain and work( The difference in rate domain is received, and reaches lifting cell averagely and edge customer spectrum efficiency, is improved cell and is accessed The purpose of number of users.

One PDMA patterns matrix can support multiple user's pairing transmission, with typical 3,7PDMA patterns As a example by matrix, a row of PDMA pattern matrixes are a PDMA pattern vectors, and descending maximum can be supported 7 user's pairing transmission.In PDMA pattern matrixes, matching somebody with somebody in, one PDMA of each CU Pattern set of vectors, PDMA patterns set of vectors can be the one or more columns per page in PDMA pattern matrixes, Power distribution pattern matrix A is equal with the ranks of PDMA pattern matrixes.

PDMA technologies are applied to during LTE downlinks carry out power distribution, it is critical only that be Same user with centering selects power distribution pattern matrix A to realize optimal power ratio and determination User's down transmitting power.

In a preferred embodiment, determine PDMA pattern matrixes, be that each user's distribution is different PDMA pattern set of vectors, forms power distribution pattern matrix concrete according to the PDMA patterns set of vectors Including：

According to the total resource of the total number of users of cell and system, the descending PDMA pattern squares of PDMA are selected Battle array H_PDMA(M*N), M is the line number of PDMA pattern matrixes, and N is PDMA pattern matrix column numbers；

Using PDMA patterns matrix and power allocation factor matrixPoint The PDMA pattern set of vectors for calculating each user is taken advantage of, power distribution pattern matrix is formedK represents the use of descending pairing Amount, N₁,N₂,…,N_KThe user 1,2 ... of pairing is represented respectively, and K takes PDMA pattern matrix column numbers, And N=N₁+N₂+…+N_K, A₁,A₂,…,A_KRespectively represent user 1,2 ..., the power distribution pattern set of vectors of K, Dot product between representing matrixs.

PDMA technologies are applied to during LTE downlinks carry out power distribution, according to selecting work( Rate is distributed pattern matrix A and determines the difference of the complexity of user's down transmitting power, descending power distribution There is two kinds of Optimizing Mode and the simplified mode, in a preferred embodiment, PDMA is applied under LTE During line link carries out power distribution, using Optimizing Mode.The user of each pairing is traveled through, according to pairing User in the cell location is different, be that the PDMA patterns set of vectors distribution of each user is all Possible different power allocation factor, makes direct ratio (PF, the Proportional Fair) weighting after user's pairing It is maximum with handling capacity.Power distribution pattern matrix A is corresponding with PDMA pattern matrixes, power allocation factor Corresponding with PDMA pattern set of vectors, a PDMA patterns set of vectors can be PDMA pattern matrixes One or more columns per page, power allocation factor refers to PDMA pattern set of vectors element sums.

Then during this, one is determined with each user of centering according to the power distribution pattern matrix A Power allocation factor specifically include：

Selected descending power distributes prioritization scheme；

The PDMA pattern set of vectors and power allocation factor current for each user is combined, according to PF The maximum criterion of weighted sum handling capacity isAnd meet ||A||₁=1 is adjusted, and makes the PF weighted sums handling capacity after multi-user's pairing maximum, wherein, T_k(SINR_k,A) Transfer rates of the user k when power distribution pattern matrix is A is represented, by the SINR and occupancy of user k The transmitted bit number that esource impact is obtained is calculated, SINR values and the PDMA pattern matrixes of user k In power allocation factor it is related, BLER_k(SINR_k,A) represent user k when power distribution pattern matrix is A The Block Error Rate estimated, is obtained by SINR and BLER mapping relations,Represent user's k going through in t History Mean Speed, | | A | |₁=1 represents that down transmitting power is constant, | | | |₁Represent the unit to power distribution pattern matrix Element summation；

For any user k, history Mean Speed computing formula is Table Show the history Mean Speed that the statistics at the current time of user k is obtained,Represent the last statistics of user k The history Mean Speed for obtaining, R_kT () represents the present rate of user k, α represents forgetting factor, works as value For 1 when, represent PF weighted sums handling capacity it is only related to user's present rate.

In an application scenarios, as shown in Fig. 2 PDMA technologies are applied to LTE downlinks, base Include in the flow process of Optimizing Mode allocation of downlink power：

Step 201, the position according to user in cell, it is determined that needing the user of pairing.

Step 202, the total resources of total number of users and system in cell, determines PDMA pattern squares Battle array.PDMA pattern matrixes are fixed after determining, and are not changed, therefore, PDMA figures PDMA pattern vectors in sample matrix are also not change.

Step 203, according to power allocation factor matrixFor each user Distribution and PDMA pattern set of vectors different before, according to PDMA patterns set of vectors power distribution is formed Pattern matrix, and, the down transmitting power of each user is determined according to power distribution pattern matrix.Here The situation of primary distribution PDMA patterns set of vectors and power allocation factor is described, is redistributed different PDMA patterns set of vectors and power allocation factor and primary allocation flow are identicals, wherein, work( Rate distribution factor matrix is change in adjusting each time.

Step 204, calculates the PF weighted sum handling capacities after multi-user's pairing.

Step 205, judges that current PF weighted sums handling capacity is compared with PF weighted sum handling capacities before No maximum, if current PF weighted sum handling capacities are not maximum compared with result before, return to step 23, if current PF weighted sum handling capacities are maximum, go to step 206；

Step 206, through the different PDMA patterns set of vectors and work(of the user of all pairings of above-mentioned traversal Rate distribution factor is combined, if having found the combination for making PF weighted sums handling capacity maximum, export now each The down transmitting power of user.

Under Optimizing Mode, when searching optimum power distribution pattern matrix, first have to select pairing user, so Distribute different power allocation factor matrixes for pairing user afterwards, and work(is obtained with reference to PDMA pattern matrixes Rate distributes pattern matrix, and whether PF weighted sums handling capacity is maximum further to judge the power distribution pattern matrix, Until finding the power distribution pattern matrix for causing PF weighted sums handling capacity maximum.

It is further reduction PDMA technology applications because the total down transmitting power during descending is limited The complexity of power distribution is carried out in LTE downlinks, descending power distributes the design philosophy of the simplified mode It is the down transmitting power phase for ensureing each user in its each row for having distributed PDMA pattern set of vectors Deng.In a preferred embodiment, the simplified mode of allocation of downlink transmission power includes：

Remote subscriber and near-end user are distinguished by reference to signal reception power or reference signal SINR；For remote End subscriber distributes the first power, and near-end user distributes the second power, and the first power is more than the second power；

The PDMA patterns set of vectors and power allocation factor combination of all users is traveled through, the work(of user is determined Rate distribution factor, this includes：It is determined that on the basis of total down transmitting power, determining each user in PDMA The power allocation factor of pattern matrix Nei Gelie is equal.

It is determined that on the basis of each row power allocation factor of each user, due in PDMA technologies respectively row Identical information is sent per row element, accordingly, it would be desirable to ensure power distribution of each user in each column on each row The factor is equal, therefore in a preferred embodiment, also includes：Determine each user in PDMA patterns In matrix in each column each row power allocation factor.

In an application scenarios, descending total down transmitting power is set as 1, the user that there is two pairings： First user and second user, as shown in figure 3, as a example by with PDMA pattern matrixes [3,7], PDMA figures Sample matrix isFirst user is located at cell edge, takes PDMA pattern matrixes The 2nd～4 row, second user be located at center of housing estate, take PDMA pattern matrixes the 5th～7 row.Adopt It is that first user and second user allocation of downlink power include with the simplified mode：

Step 1, first user is located at cell edge, therefore, the first power 0.8 of distribution, and second user Positioned at center of housing estate, distribute the second power 0.2；

Step 2, because first user and second user respectively account for three row, therefore, the power that first user is respectively arranged 0.8/3 is, the power that second user is respectively arranged is 0.2/3；

Step 3, because every row element power allocation factor is equal in PDMA technologies respectively row, therefore, the Power allocation factor average out to 0.8/3/2 in one user Ge Lie per row element, second user is often gone first in respectively arranging The power allocation factor of element is 0.2/3/1.

In a preferred embodiment, also include：Step 104, by multiple users in identical time-frequency domain and Superposed transmission is realized on spatial domain.Power distribution is reasonably carried out between remote subscriber and near-end user, PDMA superposed transmissions on power domain equivalent to multi-user, from system perspective, because multi-user's superposition is passed After defeated, the scheduling times of each user increase, and the impact very little that edge customer is brought due to power reduction, Therefore, cell is average and edge customer spectrum efficiency will be greatly improved.

In power distributing technique when the PDMA that the present invention is provided is applied to LTE system downlink, nothing By for Optimizing Mode or the simplified mode, in a preferred embodiment, in receiving terminal, for distal end is used Family, using least mean-square error (MMSE, Minimum Mean Square Error) machine testing is received；

For near-end user, using serial interference elimination (SIC, Successive Interference Cancellation) reception mechanism detection；First the interference of remote subscriber is deleted, its own signal is then detected again.

In receiving terminal, due to edge customer power it is higher, can using least mean-square error (MMSE, Minimum Mean Square Error) machine testing is received, and central user then can be disappeared using stepwise derivation Except the detection of (SIC, Successive Interference Cancellation) reception mechanism, first delete the first power and send out The edge customer for sending, then detects again its own signal.Encoding domain and power domain characteristic can be so made full use of, Increase in identical time-frequency, spatial domain resource the simultaneously number of users of scheduling, and then lift that cell is average and edge User's spectrum efficiency, improves the spectrum efficiency of cell accessing user, improves cell access customer number.

The embodiment of the present invention provides a kind of device of the allocation of downlink power in LTE system, including：

Pairing unit, for the position according to user in cell, it is determined that needing the user of pairing；

Power distribution pattern matrix unit, is that each user distributes not for determining PDMA pattern matrixes Same PDMA pattern set of vectors, according to PDMA patterns set of vectors power distribution pattern matrix A is formed；

Down transmitting power unit, for determining one with centering according to the power distribution pattern matrix A The power allocation factor of each user, according to the power allocation factor downlink work(of each user is determined Rate.

In a preferred embodiment, power distribution pattern matrix unit includes：

PDMA pattern matrix modules, the PDMA pattern matrix descending for selecting PDMA H_PDMA(M*N), M is the line number of PDMA pattern matrixes, and N is PDMA pattern matrix column numbers；

Power distribution pattern matrix chosen module, for using PDMA patterns matrix and power allocation factor MatrixThe PDMA pattern set of vectors of each user is calculated, is formed Power distribution pattern matrixK Represent the number of users of descending pairing, N₁,N₂,…,N_KThe user 1,2 of pairing is represented respectively ..., K takes PDMA Pattern matrix column number, and N=N₁+N₂+…+N_K, A₁,A₂,…,A_KUser 1,2 is represented respectively ..., the work(of K Rate distributes pattern set of vectors, the dot product between representing matrixs.

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 current for each user point With combinations of factors, it is according to the criterion that PF weighted sums handling capacity is maximumAnd satisfaction | | A | |₁=1 is adjusted, and matches somebody with somebody multi-user PF weighted sums handling capacity to after is maximum, wherein, T_k(SINR_k,A) represent user k in power distribution pattern Transfer rate when matrix is A, the transmitted bit number obtained by the SINR and occupancy esource impact of user k Calculate, the SINR values of user k are related to the power allocation factor in PDMA pattern matrixes, BLER_k(SINR_k,A) represent user k Block Error Rates for estimating when power distribution pattern matrix is A, by SINR and BLER mapping relations are obtained,Represent history Mean Speeds of the user k in t, | | A | |₁Under=1 represents Row transmission power is constant, | | | |₁Represent that the element to power distribution pattern matrix is sued for peace；

For any user k, history Mean Speed computing formula is Table Show the history Mean Speed that the statistics at the current time of user k is obtained,Represent the last statistics of user k The history Mean Speed for obtaining, R_kT () represents the present rate of user k, α represents forgetting factor, works as value For 1 when, represent PF weighted sums handling capacity it is only 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, uses for distinguishing distal end by reference to signal reception power or reference signal SINR Family and near-end user；Distribute the first power for remote subscriber, near-end user distributes the second power；Traversal is all Multi-user's power allocation factor combination, determine the power allocation factor between user.

In a preferred embodiment, the simplified mode module includes：

Column count module, for determine each user PDMA pattern matrix Nei Gelie power distribution because Son；

Transmission power module, for it is determined that on the basis of user's general power, it is ensured that the PDMA of each user Total down transmitting power is equal between pattern rectangular array.

The embodiment of the present invention provides a kind of system of allocation of downlink power, including：Base station, receiving terminal；It is described Base station includes a kind of device of allocation of downlink power, and device includes：

Pairing unit, for the position according to user in cell, it is determined that needing the user of pairing；

Power distribution pattern matrix unit, is that each user distributes not for determining PDMA pattern matrixes Same PDMA pattern set of vectors, according to PDMA patterns set of vectors power distribution pattern matrix is formed；

Down transmitting power unit, for according to the power distribution pattern matrix determine one with centering each The power allocation factor of user, according to the power allocation factor down transmitting power of each user is determined；

Receiving terminal, for as remote subscriber, using least mean-square error machine testing being received；Use as near-end Family, using serial interference elimination machine testing is received, and first deletes the interference of remote subscriber, is then detected again certainly Body signal.

It is using the advantage after this programme：In multiuser downstream transmitting procedure, existed using PDMA technologies Make a distinction on encoding domain and power domain, in identical time-frequency domain, spatial domain resource superposed transmission is carried out, lead to Rational allocation of downlink power is crossed, cell access customer number not only can be lifted, and effectively increase cell Average and edge customer spectrum efficiency.

The above is the preferred embodiment of the present invention, it is noted that for the common skill of the art For art personnel, on the premise of without departing from principle of the present invention, some improvements and modifications can also be made, These improvements and modifications also should be regarded as protection scope of the present invention.

Claims (11)

1. a kind of method of allocation of downlink power, is applied to base station, it is characterised in that method includes：

Position according to user in cell, it is determined that needing the user of pairing；

Determine PDMA pattern matrixes, be that each user distributes different PDMA pattern set of vectors, according to The PDMA patterns set of vectors forms power distribution pattern matrix；

One power allocation factor with each user of centering, root are determined according to the power distribution pattern matrix Determine the down transmitting power of each user according to the power allocation factor.

2. method according to claim 1, it is characterised in that determine PDMA pattern matrixes, be Each user distributes different PDMA pattern set of vectors, and according to the PDMA patterns set of vectors work(is formed Rate distribution pattern matrix is specifically included：

According to the total resource of the total number of users of cell and system, the descending PDMA pattern squares of PDMA are selected Battle array H_PDMA(M*N), M is the line number of PDMA pattern matrixes, and N is PDMA pattern matrix column numbers；

Using PDMA patterns matrix and power allocation factor matrixMeter The PDMA pattern set of vectors of each user is calculated, power distribution pattern matrix is formedK represents the use of descending pairing Amount, N₁,N₂,…,N_KThe user 1,2 ... of pairing is represented respectively, and K takes PDMA pattern matrix column numbers, And N=N₁+N₂+…+N_K, A₁,A₂,…,A_KRespectively represent user 1,2 ..., the power distribution pattern set of vectors of K, Dot product between representing matrixs.

3. method according to claim 2, it is characterised in that according to the power distribution pattern square Battle array determines that a power allocation factor with centering each user is specifically included：

Selected descending power distributes prioritization scheme；

The PDMA pattern set of vectors and power allocation factor current for each user is combined, according to PF The maximum criterion of weighted sum handling capacity is $A_{opt}=\underset{A}{\arg \max }\left\{\underset{k=1}{\overset{K}{\Σ}}\frac{T_k\left({\mathrm{SINR}}_{k,A}\right)\·(1-{\mathrm{BLER}}_k({\mathrm{SINR}}_{k,A}))}{{\stackrel{\‾}{R}}_k\left(t\right)}\right\},$ And meet ||A||₁=1 is adjusted, and makes the PF weighted sums handling capacity after multi-user's pairing maximum, wherein, T_k(SINR_k,A) Transfer rates of the user k when power distribution pattern matrix is A is represented, by the SINR and occupancy of user k The transmitted bit number that esource impact is obtained is calculated, SINR values and the PDMA pattern matrixes of user k In power allocation factor it is related, BLER_k(SINR_k,A) represent user k when power distribution pattern matrix is A The Block Error Rate estimated, is obtained by SINR and BLER mapping relations,Represent user's k going through in t History Mean Speed, | | A | |₁=1 represents that down transmitting power is constant, | | | |₁Represent the unit to power distribution pattern matrix Element summation；

For any user k, history Mean Speed computing formula is Table Show the history Mean Speed that the statistics at the current time of user k is obtained,Represent the last statistics of user k The history Mean Speed for obtaining, R_kT () represents the present rate of user k, α represents forgetting factor, works as value For 1 when, represent PF weighted sums handling capacity it is only related to user's present rate.

4. method according to claim 2, it is characterised in that according to the power distribution pattern square Battle array determines that a power allocation factor with centering each user also includes：

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；

Distribute the first power for remote subscriber, be that near-end user distributes the second power, first power and the Two power correspond to power allocation factor, and the first power is more than the second power.

5. method according to claim 4, it is characterised in that according to the power distribution pattern square Battle array determines that a power allocation factor with centering each user includes：

Determine power allocation factor of each user on each PDMA patterns vector in PDMA pattern matrixes It is equal；

And, determine the work(of each user each row in each PDMA patterns vector in PDMA pattern matrixes Rate distribution factor.

6. a kind of device of allocation of downlink power, it is characterised in that include：

Pairing unit, for the position according to user in cell, it is determined that needing the user of pairing；

Power distribution pattern matrix unit, is that each user distributes not for determining PDMA pattern matrixes Same PDMA pattern set of vectors, according to PDMA patterns set of vectors power distribution pattern matrix is formed；

Down transmitting power unit, for according to the power distribution pattern matrix determine one with centering each The power allocation factor of user, according to the power allocation factor down transmitting power of each user is determined.

7. device according to claim 6, it is characterised in that power distribution pattern matrix unit bag Include：

PDMA pattern matrix modules, the PDMA pattern matrix descending for selecting PDMA H_PDMA(M*N), M is the line number of PDMA pattern matrixes, and N is PDMA pattern matrix column numbers；

Power distribution pattern matrix chosen module, for using PDMA patterns matrix and power allocation factor MatrixThe PDMA pattern set of vectors of each user is calculated, is formed Power distribution pattern matrixK Represent the number of users of descending pairing, N₁,N₂,…,N_KThe user 1,2 of pairing is represented respectively ..., K takes PDMA Pattern matrix column number, and N=N₁+N₂+…+N_K, A₁,A₂,…,A_KUser 1,2 is represented respectively ..., the work(of K Rate distributes pattern set of vectors, the dot product between representing matrixs.

8. device according to claim 7, it is characterised in that down transmitting power 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 current for each user point With combinations of factors, it is according to the criterion that PF weighted sums handling capacity is maximum $A_{opt}=\underset{A}{\arg \max }\left\{\underset{k=1}{\overset{K}{\Σ}}\frac{T_k\left({\mathrm{SINR}}_{k,A}\right)\·(1-{\mathrm{BLER}}_k({\mathrm{SINR}}_{k,A}))}{{\stackrel{\‾}{R}}_k\left(t\right)}\right\},$ And satisfaction | | A | |₁=1 is adjusted, and matches somebody with somebody multi-user PF weighted sums handling capacity to after is maximum, wherein, T_k(SINR_k,A) represent user k in power distribution pattern Transfer rate when matrix is A, the transmitted bit number obtained by the SINR and occupancy esource impact of user k Calculate, the SINR values of user k are related to the power allocation factor in PDMA pattern matrixes, BLER_k(SINR_k,A) represent user k Block Error Rates for estimating when power distribution pattern matrix is A, by SINR and BLER mapping relations are obtained,Represent history Mean Speeds of the user k in t, | | A | |₁Under=1 represents Row transmission power is constant, | | | |₁Represent that the element to power distribution pattern matrix is sued for peace；

For any user k, history Mean Speed computing formula is Table Show the history Mean Speed that the statistics at the current time of user k is obtained,Represent the last statistics of user k The history Mean Speed for obtaining, R_kT () represents the present rate of user k, α represents forgetting factor, works as value For 1 when, represent PF weighted sums handling capacity it is only related to user's present rate.

9. device according to claim 7, it is characterised in that down transmitting power unit includes：

The downlink mode chosen module, is additionally operable to select descending power distribution the simplified mode；

The simplified mode module, uses for distinguishing distal end by reference to signal reception power or reference signal SINR Family and near-end user；Distribute the first power for remote subscriber, near-end user distributes the second power；Traversal is all Multi-user's power allocation factor combination, determine the power allocation factor between user.

10. device according to claim 9, it is characterised in that the simplified mode module includes：

Column count module, for determine each user PDMA pattern matrix Nei Gelie power distribution because Son；

Transmission power module, for it is determined that on the basis of user's general power, it is ensured that the PDMA of each user Total down transmitting power is equal between pattern rectangular array.

A kind of 11. systems of allocation of downlink power, including：Base station and receiving terminal；The base station includes one kind The device of allocation of downlink power, device includes：

Pairing unit, for the position according to user in cell, it is determined that needing the user of pairing；

Power distribution pattern matrix unit, is that each user distributes not for determining PDMA pattern matrixes Same PDMA pattern set of vectors, according to PDMA patterns set of vectors power distribution pattern matrix is formed；

Down transmitting power unit, for according to the power distribution pattern matrix determine one with centering each The power allocation factor of user, according to the power allocation factor down transmitting power of each user is determined；

Receiving terminal, for as remote subscriber, using least mean-square error machine testing being received；Use as near-end Family, using serial interference elimination machine testing is received, and first deletes the interference of remote subscriber, is then detected again certainly Body signal.