CN104219703B - A kind of two benches interference alignment schemes in isomery cellular network downlink communication - Google Patents
A kind of two benches interference alignment schemes in isomery cellular network downlink communication Download PDFInfo
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Abstract
The invention discloses the two benches interference alignment schemes in a kind of isomery cellular network downlink communication, mainly solve the descending interference problem in isomery cellular network.Implementation step is：(1) base station selected respective service user；(2) user measures each base station to the channel condition information of itself and feeds back to the base station for oneself service；(3) channel condition information is sent to macro base station by smallcell base stations, and (4) macro base station disturbs according to this information architecture two benches to align；(5) receiving filter for sending pre-coding matrix and user is sent to each smallcell base stations by macro base station；(6) receiving filter of user is sent to user and sends data to respective user by base station；(7) user receives data using the receiving filter received.The present invention devises new interference alignment schemes, adds the data fluxion of simultaneous transmission in network, improve network capacity according to the characteristic of isomery cellular network.
Description
Technical field
The present invention relates to wireless communication field, and in particular to the two benches interference alignment in isomery cellular network downlink communication
Method, available for the descending interference management in isomery cellular network.
Background technology
The fast development of wireless traffic causes the dilatation of cordless communication network to turn into a urgent problem.Study table
It is bright, can be economical by laying smallcell, such as relay, picocell, femtocell in existing macro cells
The capacity of effective lifting network.However, due to smallcell and macrocellular multiplexing identical frequency spectrum resource, this causes isomery
Interference problem in cellular network is very serious.
Due to smallcell introducing so that occur two kinds of new interference in isomery cellular network：Interlayer interference and
Intraformational interference.Intraformational interference refers to the interference of same level minizone in isomery cellular network, such as the interference between picocell；Interlayer
Interference refers to the interference of different levels minizone in isomery cellular network, such as the interference between macrocellular and picocell.It is existing
The method of interference management is mainly to be realized by the method for resource division.By distributing orthogonal money to the cell interfered
The purpose avoided is disturbed to reach in source.But this method can not realize full rate multiplexing, so greatly reducing the utilization of frequency spectrum
Efficiency.
Interference alignment schemes are considered as a kind of effective ways for solving network interferences.The basic thought of interference alignment is logical
Cross design send pre-coding matrix so that multiple interference signals snap on same subspace so that other subspaces can be with
Glitch-free transmission.Disturb alignment method can effectively in increase system parallel transmission data fluxion, be so as to increase
The capacity of system.Because smallcell numbers are more in isomery cellular network and the number of antennas of base station and user equipment is limited, such as
Fruit will reach perfect interference alignment, then only less number of links can be with simultaneous transmission, so as to limit the capacity of network.
The content of the invention
In view of the shortcomings of the prior art, the present invention is intended to provide the two benches in a kind of isomery cellular network downlink communication are done
Alignment schemes are disturbed, by making full use of the characteristic of isomery cellular network to propose a kind of new interference alignment schemes, to solve isomery
Descending interference problem in cellular network.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of two benches interference alignment schemes in isomery cellular network downlink communication, comprise the following steps：
Step 1, S grand users of macro base station selection are serviced, and each base station selected user of smallcell is taken
Business, wherein S≤M0, M0For the number of antennas of macro base station；
Step 2, selected user measures all base stations to the channel condition information (CSI) of itself, and feeds back to for certainly
The base station of oneself service；
Step 3, the CSI information received is sent to macro base station by each smallcell base stations；
Step 4, macro base station is labeled as 0, S grand user's marks of macro base station selection are { k1, k2..., kS}；Due to every
Individual smallcell base stations only select a user to be serviced, therefore mark it to be serviced with the numbering of smallcell base stations
User；Simultaneously as each cell only has a base station, therefore the numbering of smallcell base stations is also marking
smallcell；Smallcell base stations { 1,2 ..., L } form a group A, smallcell base stations { L+1, L+2 ..., L+
J } one group B of composition, wherein：
Δ=M+N- (S+1) d, M are the transmission antenna number of each smallcell base stations, all smallcell base stations tools
There is equal number of transmission antenna；N is the reception antenna number of each user, and there is all users identical to receive day in network
Line number mesh；D is the number of the data flow received by each smallcell user in each grand user and group A, i.e. macro base station
D data flow is sent to each grand user, user of each smallcell base stations also to its service sends d number in group A
According to stream；
Step 5, the macro base station designs the transmission pre-coding matrix of itself and the smallcell base stations in the group A；
Step 6, the macro base station designs the transmission pre-coding matrix of the smallcell base stations in the group B；
Step 7, macro base station filters the reception for sending pre-coding matrix and corresponding user of obtained each smallcell base stations
Ripple device is sent to corresponding smallcell base stations by back haul link；
Step 8, the receiving filter of its user is sent to corresponding user by macro base station with each smallcell base stations, and
Using the transmission pre-coding matrix obtained in step 5 and 6 data are sent to the user each serviced；
Step 9, each user is using the receiving filter received, to eliminate interference and receive data.
It should be noted that in step 4, in the smallcell base stations and the group B in the group A
Smallcell base stations have following characteristic：
First, serious interference, i.e. smallcell i (i ∈ be present between the smallcell in the group A
{ 1 ..., L }) at least meet one in following condition：
(1) smallcell i base station is at least to one in the user of other smallcell base stations services in group A
User produces severe jamming, i.e.,PjFor smallcell base stations j transmission power, PiFor
Smallcell base stations i transmission power, HJ, iRepresent smallcell base station i to user j channel matrix, HJ, jArrived for base station j
Institute service user j direct channels matrix, ‖ ‖FThe F- norms of representing matrix, α are a threshold value, and value is in configuration system
Given during parameter；
(2) user in smallcell i is by least one base station in the base station of other smallcell in group A
Severe jamming, i.e.,HI, jRepresent smallcell base station j to user i interference channel matrix；
HI, jDirect channels matrix for base station i to institute service user i；
Secondly, the smallcell base stations in the group B cause very weak do to smallcell user in the group A
Disturb, i.e.,β is a threshold value, and value gives when configuring systematic parameter, and in group A
Very weak interference is caused in smallcell base stations to smallcell user in group B, i.e.,Together
When, very weak interference is caused in smallcell base stations to the user of other smallcell in group B in the group B, i.e.,I ∈ { L+1 ..., L+J }.
It should be noted that the step 5 specifically comprises the following steps：
Step 5.1, macro base station is calculated following matrix：
Wherein,HL+x, 0Represent from macro base station to the letter of the user L+x in group B
Road matrix, x=1,2 ..., q,The conjugate transposition operation of representing matrix, null () represent to seek the kernel of matrix；
Step 5.2, macro base station calculates smallcell bases in the macro base station and group A using layering interference alignment scheme
The transmission pre-coding matrix stood, in the process macro base station use following equivalent channel matrix
The layering interference alignment scheme specifically includes following process：
Smallcell base stations in step 5.2.1, the group A generate random pre-coding matrix Vj, VjMeet condition It is VjConjugate transposition, j=1,2 ..., L, IdFor d × d unit matrix；
Step 5.2.2, orderJ=1,2 ..., L；
Step 5.2.3, the transmission pre-coding matrix in step 5.2.2Calculate interference covariance matrix：Wherein, HI, jIt is channel matrixes of the base station j to user i, PjIt is base station j
Transmit power, i ∈ { k1..., kS, 1 ..., L }；
Step 5.2.4, judge interference leakage IfWhether interference leakage threshold value ε is less than, if it is, in step 5.2.2
Transmission pre-coding matrixTransmission pre-coding matrix as required for the j of base station, orderAnd enter step
5.2.7；Otherwise, into step 5.2.5；Wherein, interference leakageTr[IFi] it is step 5.2.3
The interference covariance matrix IFiMark, ε is that threshold value is revealed in given interference, is given when configuring systematic parameter；ε is one
Individual empirical value, it determines the iterations of this algorithm of layering interference alignment, if ε is smaller, then algorithm iteration number
Compare more, effect is preferable, conversely, iterations is less, effect is poor.Need to take a suitable value in practice, to take into account
Iterations and performance；
Step 5.2.5, based on the interference covariance matrix IF drawn in step 5.2.3i, calculate the reception filter of user
Ripple device：Ui=vd[IFi], i ∈ { k1..., kS, 1 ..., L }, wherein, UiFor user i receiving filter, vd[IFi] it is by doing
Disturb covariance matrix IFiThe matrix that characteristic vector corresponding to d minimum characteristic value is formed；
Step 5.2.6, user's receiving filter in step 5.2.5, according to equation belowCalculation base station j transmission pre-coding matrix and return to step 5.2.2；Its
In, UiFor the receiving filter of user i in step 5.2.5, j=1,2 ..., L；
Step 5.2.7, based on the interference covariance matrix IF drawn in step 5.2.3i, calculate the reception filter of user
Ripple device：Ui=vd[IFi], i ∈ { k1..., kS, 1 ..., L }；
Step 5.2.8, calculate the pre-coding matrix of macro base station：
Wherein s=1,2..., S, then the transmission pre-coding matrix of macro base station be：
It should be noted that the step 6 comprises the following specific steps that：
Step 6.1, the transmission pre-coding matrix of smallcell base stations { L+1, L+2 ..., L+q } is designed, is specially：
Step 6.1.1, macro base station are calculated as follows matrix：
Step 6.1.2, macro base station carry out singular value decomposition to following matrix：
Wherein matrix ΛjDiagonal element be matrixSingular value, smallcell base stations j transmission pre-coding matrix
I.e.J=L+1 ..., L+q, its user j serviced receiving filter isJ=L+1 ..., L+
q；
The transmission pre-coding matrix of step 6.2. designs smallcell base stations { L+q ..., L+J }, it is specially：
Step 6.2.1, macro base station are calculated as follows matrix
Step 6.2.2, macro base station carry out singular value decomposition to following matrix
Smallcell base stations j transmission pre-coding matrix isJ=L+q ..., L+J, it is serviced
User j receiving filter beJ=L+q ..., L+J.
The beneficial effects of the present invention are：
1st, the present invention makes full use of geographical space according to the low power characteristic of smallcell base stations in isomery cellular network
Resource so that more smallcell base stations with simultaneous transmission data, can add the handling capacity of network.
2nd, the present invention takes full advantage of the isomery characteristic of isomery cellular network, i.e. macro base station has more transmission antennas：
By making full use of the antenna of macro base station to reduce interference of the macro base station to smallcell base stations, so as to add gulping down for network
The amount of telling.
3rd, the present invention sends pre-coding matrix by designing, and not only allows macro base station and more smallcell bases
Stand simultaneous transmission, also eliminate interlayer interference and intraformational interference in isomery cellular network simultaneously.
Brief description of the drawings
Fig. 1 be the present invention realize general flow chart；
Fig. 2 is the flow chart that two benches interference alignment is built in Fig. 1.
Embodiment
Below with reference to accompanying drawing, the invention will be further described, but it should be recognized that the present embodiment is with this technology
Premised on scheme, detailed embodiment and implementation steps are provided, but be not limited to the present embodiment.
Reference picture 1, specific implementation step of the invention are as follows：
Step 1, S grand users of macro base station selection are serviced, and one user of each base station selected selections of smallcell enters
Row service, wherein S≤M0, M0For the number of antennas of macro base station；
Step 2, selected user measures all base stations to the channel condition information (CSI) of itself, and feeds back to for certainly
The base station of oneself service.
The channel condition information CSI is channel matrix HI, j, i ∈ { k1..., kS, 1 ..., L, L+1 ..., L+J, j
∈ { 1 ..., L, L+1 ..., L+J }.
Step 3：The CSI information received is sent to macro base station by each smallcell base stations.
Step 4：For statement it is easy for the sake of, macro base station is labeled as 0 by us, S grand user's marks of macro base station selection for
{k1, k2..., kS}.Smallcell base stations in group A are { 1,2 ..., L }, and the smallcell base stations in group B are { L+
1, L+2 ..., L+J }, wherein：
Δ=M+N- (S+1) d, M are the transmission antenna number of each smallcell base stations, all smallcell base stations tools
There is equal number of transmission antenna；N is the reception antenna number of each user, and there is all users identical to receive day in network
Line number mesh；D is the number of the data flow received by each smallcell user in each grand user and group A, i.e. macro base station
D data flow is sent to each grand user, user of each smallcell base stations also to its service sends d number in group A
According to stream；Because each smallcell base stations only select a user service, compiled used here as with smallcell base stations identical
Number mark the user of each base station service；Simultaneously as each cell only has a base station, therefore the volume of smallcell base stations
Number also marking smallcell.
In step 4, smallcell has following characteristic in smallcell and group B in group A：
First, serious interference, i.e. smallcell i (i ∈ be present between the smallcell in the group A
{ 1 ..., L }) at least meet one in following condition：
(1) smallcell i base station is at least to one in the user of other smallcell base stations services in group A
User produces severe jamming, i.e.,PjFor smallcell base stations j transmission power, PiFor
Smallcell base stations i transmission power, HJ, iRepresent smallcell base station i to user j channel matrix, HJ, jArrived for base station j
Institute service user j direct channels matrix, | | | |FThe F- norms of representing matrix, α are a threshold value, and value is in configuration
Given during parameter of uniting；
(2) user in smallcell i is by least one base station in the base station of other smallcell in group A
Severe jamming, i.e.,HI, jRepresent smallcell base station j to user i interference channel matrix；
HI, jDirect channels matrix for base station i to institute service user i；
Secondly, the smallcell base stations in the group B cause very weak do to smallcell user in the group A
Disturb, i.e.,β is a threshold value, and value gives when configuring systematic parameter, and in group A
Very weak interference is caused in smallcell base stations to smallcell user in group B, i.e.,Together
When, very weak interference is caused in smallcell base stations to the user of other smallcell in group B in the group B, i.e.,I ∈ { L+1 ..., L+J }.
As shown in Fig. 2 the flow of structure two benches interference alignment scheme is as follows：
Step 5：The stage one of structure two benches interference alignment is realized, i.e. macro base station is designed in itself and group A
The pre-coding matrix of samllcell base stations；
Step 5.1, macro base station is calculated as follows matrix：
Wherein,HL+x, 0Represent the channel square from macro base station user L+x into group B
Battle array, x=1,2 ..., q.The conjugate transposition operation of representing matrix, null () represent to seek the kernel of matrix；
Step 5.2, macro base station calculates smallcell base stations in macro base station and group A using layering interference alignment scheme
Pre-coding matrix.Macro base station uses following equivalent channel matrix in the process
The layering interference alignment scheme realizes that step is as follows：
Smallcell base stations generate random pre-coding matrix V in step 5.2.1, group Aj, VjMeet conditionIt is VjConjugate transposition, j=1,2 ..., L, IdFor d × d unit matrix；
Step 5.2.2, orderJ=1,2 ..., L；
Step 5.2.3, the transmission pre-coding matrix in step 5.2.2Calculate interference covariance matrix：
Wherein, HI, jIt is channel matrixes of the base station j to user i, PjIt is base station j transmit power, i ∈ { k1..., kS,
1 ..., L }；
Step 5.2.4, judge interference leakage IfWhether interference leakage threshold value ε is less than, if it is, in step 5.2.2
Transmission pre-coding matrixTransmission pre-coding matrix as required for the j of base station, orderAnd enter step
5.2.7；Otherwise, into step 5.2.5.Wherein, interference leakageTr[IFi], Tr [IFi] it is the step
5.2.3 interference covariance matrix IFiMark, ε is that threshold value is revealed in given interference, is given when configuring systematic parameter；
Step 5.2.5, based on the interference covariance matrix IFi, calculate the receiving filter of user：
Ui=vd[IFi], i ∈ { k1..., kS, 1 ..., L }；
Wherein, UiFor user i receiving filter, vd[IFi] it is by interference covariance matrix IFiD minimum characteristic value
The matrix that corresponding characteristic vector is formed；
Step 5.2.6, the user's receiving filter drawn according to step 5.2.5, according to formula
Calculation base station j transmission pre-coding matrix, and return to step 5.2.2, wherein, UiFor the user i drawn in step 5.2.5
Receiving filter, j=1,2 ..., L；
Step 5.2.7, based on the interference covariance matrix IF in step 5.2.3i, calculate the receiving filter of user：Ui=
vd[IFi], i ∈ { k1..., kS, 1 ..., L }；
Step 5.2.8, calculate the transmission pre-coding matrix of macro base station：
Matrix is calculated as follows first：
Wherein s=1,2 ..., S.
Then the transmission pre-coding matrix of macro base station is：
Step 6：The stage two of structure two benches interference alignment is realized, i.e. macro base station designs the smallcell bases in group B
The transmission pre-coding matrix stood.
Specific design method is as follows：
The first step：Design the transmission pre-coding matrix of smallcell base stations { L+1, L+2 ..., L+q }
Macro base station is calculated as follows matrix：
Then macro base station carries out singular value decomposition to following matrix：
Wherein matrix ΛjDiagonal element be matrixSingular value.Smallcell base stations j transmission pre-coding matrix
AsJ=L+1 ..., L+q, its user j serviced receiving filter isJ=L+
1 ..., L+q；
Second step：Design the transmission pre-coding matrix of smallcell base stations { L+q ..., L+J }：
Macro base station is calculated as follows matrix：
Then macro base station carries out singular value decomposition to following matrix：
Smallcell base stations j transmission pre-coding matrix isJ=L+q ..., L+J, it is serviced
User j receiving filter beJ=L+q ..., L+J.
Step 7：Macro base station sends pre-coding matrix and the correspondingly reception of user by the smallcell base stations being calculated
Wave filter is sent to each smallcell base stations by back haul link.
Step 8：The receiving filter of its user is sent to user by macro base station with smallcell base stations, and uses step 5
With the transmission pre-coding matrix obtained in step 6 data are sent to the user each serviced；
Step 9：The receiving filter matrix received is taken conjugate transposition by each user, and is multiplied by the signal received, with
The elimination to interference is realized, and is properly received the signal of oneself.
For those skilled in the art, technical scheme that can be more than and design, provide various corresponding
Change and deform, and all these change and deformation should be construed as being included within the protection domain of the claims in the present invention.
Claims (1)
1. the two benches interference alignment schemes in a kind of isomery cellular network downlink communication, it is characterised in that methods described includes
Following steps：
Step 1, S grand users of macro base station selection are serviced, wherein S≤M0, M0For the number of antennas of macro base station；Each
The base station selected user of smallcell is serviced；
Step 2, selected user measures all base stations to the channel condition information (CSI) of itself, and feeds back to and taken for oneself
The base station of business；
Step 3, the CSI information received is sent to macro base station by each smallcell base stations；
Step 4, macro base station is labeled as 0, S grand user's marks of macro base station selection are { k1,k2,...,kS}；Due to each
Smallcell base stations only select a user to be serviced, therefore serviced with the numbering of smallcell base stations to mark it
User；Simultaneously as each cell only has a base station, therefore the numbering of smallcell base stations is also corresponding to mark
smallcell；Smallcell base stations { 1,2 ..., L } form a group A, smallcell base stations { L+1, L+2 ..., L+
J } one group B of composition, wherein：
Δ=M+N- (S+1) d, M are the transmission antenna number of each smallcell base stations, and all smallcell base stations all have
Equal number of transmission antenna；N is the reception antenna number of each user, and all users in network are respectively provided with identical reception
Number of antennas；D is the number of the data flow received by each smallcell user in each grand user and group A, i.e., grand base
Stand and send d data flow to each grand user, user of each smallcell base stations also to its service sends d in group A
Data flow；The smallcell in smallcell and the group B in the group A has following characteristic：
First, serious interference, i.e. smallcelli (i ∈ { 1 ..., L }) between the smallcell in the group A be present
At least meet one in following condition：
(1) smallcell i base station is at least to a generation in the user of other smallcell base stations services in group A
Severe jamming, i.e.,PjFor smallcell base stations j transmission power, PiFor smallcell bases
Stand i transmission power, Hj,iRepresent smallcell base station i to user j interference channel matrix, Hj,jServiced by base station j to it
User j direct channels matrix, | | | |FThe F- norms of representing matrix, α are a threshold value, are given when configuring systematic parameter
It is fixed；
(2) user in smallcell i by group A at least one base station of other smallcell base station it is serious
Interference, i.e.,Hi,jRepresent smallcell base station j to user i interference channel matrix；Hi,iFor
Direct channels matrixes of the base station i to institute service user i；
Secondly, very weak interference is caused in the smallcell base stations in the group B to smallcell user in the group A,
I.e.β is a threshold value, is given when configuring systematic parameter；And in group A
Very weak interference is caused in smallcell base stations to smallcell user in group B, i.e.,Together
When, very weak interference is caused in smallcell base stations to the user of other smallcell in group B in the group B, i.e.,
Step 5, the macro base station sends pre-coding matrix to the smallcell base station designs in itself and the group A；Step
5.1, macro base station is calculated following matrix：
Wherein,HL+x,0Represent from macro base station to the channel square of the user L+x in group B
Battle array, x=1,2 ..., q,The conjugate transposition operation of representing matrix, null () represent to seek the kernel of matrix；
Step 5.2, macro base station calculates the transmission of smallcell base stations in the macro base station and group A using layering interference alignment
Pre-coding matrix, in the process macro base station use following equivalent channel matrix
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The layering interference alignment specifically includes following process：
Smallcell base stations in step 5.2.1, the group A generate random pre-coding matrix Vj, VjMeet condition It is VjConjugate transposition, j=1,2 ..., L, IdFor d × d unit matrix；
Step 5.2.2, order
Step 5.2.3, the transmission pre-coding matrix in step 5.2.2Calculate interference covariance matrix：Wherein, Hi,jIt is base station j to user i interference channel matrix, PjIt is base station
J transmit power, i ∈ { k1,...,kS,1,...,L}；
Step 5.2.4, judge interference leakage IfWhether interference leakage threshold value ε is less than, if it is, the transmission in step 5.2.2
Pre-coding matrixTransmission pre-coding matrix as required for the j of base station, orderAnd enter step 5.2.7；It is no
Then, into step 5.2.5；Wherein, interference leakageTr[IFi] it is to be done described in step 5.2.3
Disturb covariance matrix IFiMark, ε is that threshold value is revealed in given interference, is given when configuring systematic parameter；
Step 5.2.5, based on the interference covariance matrix IF drawn in step 5.2.3i, calculate the receiving filter of user：
Ui=vd[IFi],i∈{k1,...,kS, 1 ..., L }, wherein, UiFor user i receiving filter, vd[IFi] it is to be assisted by interference
Variance matrix IFiThe matrix that characteristic vector corresponding to d minimum characteristic value is formed；
Step 5.2.6, user's receiving filter in step 5.2.5, according to formulaCalculation base station j transmission pre-coding matrix and return to step 5.2.2；Its
In, UiFor the receiving filter of user i in step 5.2.5, j=1,2 ..., L；
Step 5.2.7, based on the interference covariance matrix IF drawn in step 5.2.3i, calculate the receiving filter of user：
Ui=vd[IFi],i∈{k1,...,kS,1,...,L}；
Step 5.2.8, calculate the transmission pre-coding matrix of macro base station：
Matrix is calculated as follows first：
Wherein s=1,2..., S, then the transmission pre-coding matrix of macro base station be：
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Step 6, the macro base station designs the transmission pre-coding matrix of the smallcell base stations in the group B；Step 6.1, if
The transmission pre-coding matrix of smallcell base stations { L+1, L+2 ..., L+q } is counted, is specially：
Step 6.1.1, macro base station are calculated as follows matrix：
Step 6.1.2, macro base station carry out singular value decomposition to following matrix：
Wherein matrix ΛjDiagonal element be matrixSingular value, smallcell base stations j transmission precoding square
Battle array VjIt can be calculated asIts user j serviced receiving filter is
The transmission pre-coding matrix of step 6.2. designs smallcell base stations { L+q ..., L+J }, it is specially：
Step 6.2.1, macro base station are calculated as follows matrix
Step 6.2.2, macro base station carry out singular value decomposition to following matrix
Smallcell base stations j transmission pre-coding matrix isIts user j serviced receiving filter is
Step 7, obtained each smallcell base stations are sent pre-coding matrix and the correspondingly receiving filter of user by macro base station
Corresponding smallcell base stations are sent to by back haul link；
Step 8, the receiving filter of its user is sent to corresponding user by macro base station with each smallcell base stations, and is used
The transmission pre-coding matrix obtained in step 5 and 6 sends data to the user each serviced；
Step 9, each user is using the receiving filter received, to eliminate interference and receive data.
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