CN103036602B - Coordinated multipoint transmission recoding processing method, apparatus and system - Google Patents
Coordinated multipoint transmission recoding processing method, apparatus and system Download PDFInfo
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Abstract
The invention discloses a kind of coordinated multipoint transmission recoding processing method, apparatus and system, this method includes：Serving BS receives the sub- pre-coding matrix index of expectation of the terminal under the serving BS and the sub- pre-coding matrix index of leakage of the terminal under cooperative base station of cooperative base station transmission；Serving BS it is expected coding codeword according to the sub- pre-coding matrix index selection of expectation, and selects the sub- pre-encoding codeword of leakage according to sub- pre-coding matrix index is leaked；Serving BS will it is expected that coding codeword obtains the first pre-encoding codeword with leaking sub- pre-encoding codeword progress convolution operation；The second pre-encoding codeword that serving BS uses the first precoding after correction as serving BS transmission signal.By the present invention, when using CoMP technologies, having reached makes reduction edge user terminal disturb the larger raising effect of accuracy rate.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of coordinated multipoint transmission recoding processing method, device and
System.
Background technology
It is long in third generation partner program (3rd Generation Partnership Project, referred to as 3GPP)
In phase evolution (Long Term Evolution-Advanced, referred to as LTE-A) system, coordinated multipoint transmission
(Coordinated Multiple Point, referred to as CoMP) technology can solve the problem that inter-cell interference, improve cell edge and
Cell spectrum efficiency.The technology is mainly for Cell Edge User, by the interaction of mobile subscriber's channel information between adjacent base station,
Adjacent base station takes certain interference avoidance strategy or multiple base stations to carry out joint transmission to mobile subscriber disturbed user
To reduce the interference of edge customer, the handling capacity and spectrum utilization efficiency of cell-edge data are improved.
Fig. 1 is the application schematic diagram of CoMP technologies in correlation technique, as shown in figure 1, there are serving BS, cooperation base in base station
Stand.Wherein, H11Represent service cell eNB1To this community user UE1Channel, H21Represent service cell eNB1Used to adjacent cell
Family UE2Channel.Equally, H22Represent cooperation cell eNB2To this community user UE2Channel, H12Represent cooperation cell eNB2Arrive
Adjacent cell user UE1Channel.
Generally, CoMP uplink feedbacks use the form of partial feedback, i.e. the channel matrix of endless this cell of unity feedback of UE with
And the channel matrix of endless unity feedback adjacent cell, but feedback fraction channel information.Specifically, UE feeds back this cell channel
Pre-coding matrix index (Precoding Matrix Indicator, referred to as PMI), UE is also fed back to adjacent cell channel most
Poor precoding indexes (Worst Companion Indicator, referred to as WCI) to realize terminal spatial domain Inter-Cell Interference Coordination
CoMP, but code book optimizing mode is cumbersome when CoMP technologies are used in correlation technique, causes CoMP to reduce edge customer when realizing
The problem of terminal interference accuracy rate is not high.
The content of the invention
Code book optimizing mode is cumbersome during for using CoMP technologies in correlation technique, causes CoMP to reduce edge when realizing and uses
The problem of family terminal interference accuracy rate is not high, the invention provides a kind of coordinated multipoint transmission recoding processing method, device and
System, at least to solve the above problems.
According to an aspect of the invention, there is provided a kind of coordinated multipoint transmission recoding processing method, including：Service base
Stand the sub- pre-coding matrix index of expectation of the terminal received under the serving BS and cooperative base station is sent in the cooperative base station
Under terminal the sub- pre-coding matrix index of leakage, wherein, it is described it is expected that sub- pre-coding matrix index correspondingly it is expected terminal direction
On coding codeword, the sub- pre-coding matrix index of the leakage corresponds to the coding codeword on interference radiating way；The serving BS root
It is expected that sub- pre-coding matrix index selection it is expected coding codeword and according to the sub- pre-coding matrix index selection of the leakage according to described
Leak sub- pre-encoding codeword；The expectation coding codeword and the sub- pre-encoding codeword of leakage are carried out convolution by the serving BS
Operation obtains the first pre-encoding codeword；The serving BS sends out first precoding after correction as the serving BS
Penetrate the second pre-encoding codeword that signal uses.
Preferably, before serving BS receives the sub- pre-coding matrix index of expectation of the terminal under the serving BS, also
Including：Terminal under the serving BS estimates the terminal under the serving BS and the channel matrix between the serving BS；
Calculated according to the channel matrix between the terminal under the serving BS and the serving BS and it is expected sub- pre-encoding codeword；According to institute
State and it is expected that sub- pre-encoding codeword obtains the sub- pre-coding matrix index of expectation.
Preferably, the sub- precoding square of leakage for the terminal under the cooperative base station that the cooperative base station is sent is being received
Before battle array index, in addition to：Terminal under the cooperative base station is estimated between terminal and serving BS under the cooperative base station
Channel matrix；Calculated according to the terminal under the cooperative base station and the channel matrix between serving BS and leak sub- pre-encoding codeword；
Obtained according to the sub- pre-encoding codeword of leakage and leak sub- pre-coding matrix index.
Preferably, calculated according to the channel matrix between the terminal under the serving BS and the serving BS and it is expected that son is pre-
Coding codeword includes：Channel matrix between terminal under the serving BS and the serving BS is subjected to singular value decomposition,
Obtain channel estimation code word matrix；The channel estimation code word in the channel estimation code word matrix is traveled through, the channel is obtained and estimates
Count the distance of code word and code word in code book；Determine that the minimum channel estimation code word of code word distance schedules to last shop sign in the form of a streamer pre-encoding codeword.
Preferably, calculated according to the terminal under the cooperative base station and the channel matrix between serving BS and leak sub- precoding
Code word includes：Terminal under the cooperative base station and the channel matrix between serving BS are subjected to singular value decomposition, obtain channel
Estimate code word matrix；Travel through the channel estimation code word in the channel estimation code word matrix, obtain the channel estimation code word with
The distance of code word in code book；The maximum channel estimation code word of code word distance is determined to leak sub- pre-encoding codeword.
Preferably, the serving BS is corrected using equation below to first precoding：When
WhenWherein,After correction
Precoding,Referring to the precoding of current time frequency unit, q identifies the state of precoding,Refer to prelisting for previous time frequency unit
Code, NRBRepresent the resource block sum used in certain user, nRBRepresent the resource block sequence number in resource set, and nRB=1,2 ... NRB。
Preferably, in the serving BS using first precoding after correction as the serving BS transmission signal
After the second pre-encoding codeword used, precoding processing is carried out to transmission signal according to second pre-encoding codeword.
According to another aspect of the present invention, there is provided a kind of coordinated multipoint transmission precoding processing device, including：Receive mould
Block, the terminal under the cooperative base station that the sub- pre-coding matrix index of expectation and cooperative base station for receiving terminal are sent
Sub- pre-coding matrix index is leaked, wherein, it is described it is expected that sub- pre-coding matrix index correspondingly it is expected the upward coding code of terminal side
Word, the sub- pre-coding matrix index of leakage correspond to the coding codeword on interference radiating way；Selecting module, for according to the expectation
Sub- pre-coding matrix index selection it is expected coding codeword and prelisted according to sub- pre-coding matrix index selection leakage of the leakage
Code code word；Convolution operation module, for the expectation coding codeword and the sub- pre-encoding codeword of leakage to be carried out into convolution operation
Obtain the first pre-encoding codeword；Processing module, for first pre-encoding codeword after correction to be used as transmission signal
The second pre-encoding codeword.
In accordance with a further aspect of the present invention, a kind of coordinated multipoint transmission precoding processing system is additionally provided, system includes
Serving BS, the serving BS include above-mentioned coordinated multipoint transmission precoding processing device, and the system also includes：The service
Terminal under base station, the terminal under the serving BS include：First estimation module, for where estimating the estimation module
The channel matrix of channel between terminal and the serving BS；First computing module, for according to the terminal and the service base
Channel matrix between standing, which calculates, it is expected sub- pre-encoding codeword；First acquisition module, for it is expected sub- pre-encoding codeword according to described
Obtain and it is expected sub- pre-coding matrix index.
Preferably, the system also includes：Terminal under cooperative base station corresponding to the serving BS, wherein, the clothes
Terminal under cooperative base station corresponding to business base station includes：Second estimation module, for estimate the terminal under the cooperative base station with
Channel matrix between serving BS；Second computing module, for according between the terminal under the cooperative base station and serving BS
Channel matrix, which calculates, leaks sub- pre-encoding codeword；Second acquisition module, it is additionally operable to be obtained according to the sub- pre-encoding codeword of leakage
Leak sub- pre-coding matrix index.
Preferably, first computing module includes：First decomposing module, for by the terminal under the serving BS with
Channel matrix between the serving BS carries out singular value decomposition, obtains channel estimation code word matrix；First spider module, is used for
Travel through the channel estimation code word in the channel estimation code word matrix, obtain code word in the channel estimation code word and code book away from
From；First determining module, for determining that the minimum channel estimation code word of code word distance schedules to last shop sign in the form of a streamer pre-encoding codeword.
Preferably, second computing module includes：Second decomposing module, it is additionally operable to the terminal under the cooperative base station
Channel matrix between serving BS carries out singular value decomposition, obtains channel estimation code word matrix；Second spider module, is additionally operable to
Travel through the channel estimation code word in the channel estimation code word matrix, obtain code word in the channel estimation code word and code book away from
From；Second determining module, it is additionally operable to determine the maximum channel estimation code word of code word distance to leak sub- pre-encoding codeword.
Preferably, the coordinated multipoint transmission precoding processing device also includes precoding module, the precoding module
For carrying out precoding processing to transmission signal according to second pre-encoding codeword.
By the present invention, using serving BS receive the terminal under the serving BS the sub- pre-coding matrix index of expectation and
The sub- pre-coding matrix index of leakage for the terminal under cooperative base station that cooperative base station is sent, wherein, it is expected sub- pre-coding matrix
The corresponding coding codeword for it is expected that terminal side is upward of index, leak sub- pre-coding matrix index and correspond to coding code on interference radiating way
Word；Serving BS it is expected coding codeword and according to the sub- pre-coding matrix index of leakage according to the sub- pre-coding matrix index selection of expectation
Selection leaks sub- pre-encoding codeword；Serving BS will it is expected that coding codeword carries out convolution operation with leaking sub- pre-encoding codeword, obtain
It is corrected to pre-encoding codeword, and to the pre-encoding codeword, solves code book optimizing when using CoMP technologies in the prior art
Mode is cumbersome, reduce the problem of edge user terminal interference accuracy rate is not high when causing the CoMP to realize, and then uses
During CoMP technologies, reduction edge user terminal is set to disturb the larger raising effect of accuracy rate.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of two cell two users' application scenarios of the CoMP precodings of correlation technique；
Fig. 2 is the flow chart of coordinated multipoint transmission recoding processing method according to embodiments of the present invention；
Fig. 3 is the structured flowchart of coordinated multipoint transmission precoding processing device according to embodiments of the present invention；
Fig. 4 is the structured flowchart of coordinated multipoint transmission precoding processing system according to embodiments of the present invention；
Fig. 5 is the preferable structured flowchart of coordinated multipoint transmission precoding processing system according to embodiments of the present invention；
Fig. 6 is the flow chart of coordinated multipoint transmission recoding processing method according to the preferred embodiment of the invention；
Fig. 7 is that effect diagram is realized in the CoMP precodings according to the preferred embodiment of the invention based on code word correction；
And
Fig. 8 is the structural frames of the CoMP precoding realization devices according to the preferred embodiment of the invention based on code word correction
Figure.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
A kind of coordinated multipoint transmission recoding processing method is provided in the present embodiment, and Fig. 2 is implemented according to the present invention
The flow chart of the coordinated multipoint transmission recoding processing method of example, as shown in Fig. 2 the flow comprises the following steps S202 to step
S208。
Step S202：Serving BS receives the sub- pre-coding matrix index of expectation and cooperation base of the terminal under the serving BS
The sub- pre-coding matrix index of leakage for the terminal under cooperative base station sent of standing, wherein, it is expected sub- pre-coding matrix index pair
The upward coding codeword of terminal side should it is expected, sub- pre-coding matrix index is leaked and correspond to coding codeword on interference radiating way.
Step S204：Serving BS it is expected coding codeword according to the sub- pre-coding matrix index selection of expectation, and according to leakage
Sub- pre-coding matrix index selection leaks sub- pre-encoding codeword.
Step S206：Serving BS will it is expected that coding codeword obtains first with leaking sub- pre-encoding codeword progress convolution operation
Pre-encoding codeword.
Step S208：Serving BS uses second pre- using the first precoding after correction as serving BS transmission signal
Coding codeword.
By above-mentioned steps, serving BS, when constructing pre-encoding codeword, pre-encoding codeword is divided into according to channel information
It is expected coding codeword and leak sub- pre-encoding codeword, and the pre-encoding codeword to obtaining is corrected, and transmission signal is more concentrated
Tried one's best in the interference signal on the upward expectation coding codeword of subscriber side terminal it is expected, and on sub- pre-encoding codeword is leaked
It is small so that during using CoMP technologies, reduction edge user terminal interference accuracy rate is obtained larger raising.
It can be accomplished by the following way as preferably embodiment, a step S204：Terminal under serving BS
Estimate the terminal under serving BS and the channel matrix between serving BS；According between the terminal under serving BS and serving BS
Channel matrix, which calculates, it is expected sub- pre-encoding codeword；It is expected sub- pre-coding matrix index according to it is expected that sub- pre-encoding codeword obtains.When
So perform above-mentioned steps and obtain and it is expected that sub- pre-coding matrix index can also the acquisition of being serviced base station.If serving BS and user
When terminal is required for the expectation sub- pre-coding matrix index, it can be realized by way of interactive information.Here by letter
The mode of road Singular Value Decomposition Using, which obtains, it is expected sub- pre-coding matrix index and leaks sub- pre-coding matrix index, also may be used certainly
It is expected sub- pre-coding matrix index and the sub- pre-coding matrix index of leakage by other Mathematical treatments to obtain, so as to obtain
It is expected sub- pre-encoding codeword and reveal sub- pre-encoding codeword, can be selected according to specific demand.
Equally, step S206 can obtain leakage pre-coding matrix index by similar mode, can specifically include
Following steps：The terminal under terminal estimation cooperative base station under cooperative base station and the channel matrix between serving BS；According to cooperation
Channel matrix between terminal and serving BS under base station, which calculates, leaks sub- pre-encoding codeword；Obtained according to sub- pre-encoding codeword is leaked
Take the sub- pre-coding matrix index of leakage.
The mode for it is expected sub- pre-encoding codeword is calculated according to the terminal under serving BS and the channel matrix between serving BS
A lot, the mathematical processing methods of singular value decomposition are introduced herein, for example, by between the terminal under serving BS and serving BS
Channel matrix carries out the singular value decomposition of mathematical theorem, obtains channel estimation code word matrix；Wherein, the channel estimation code word matrix
For a part for V matrixes, ergodic channels estimate the channel estimation code word in code word matrix, obtain in channel estimation code word and code book
The distance of code word；Determine that the minimum channel estimation code word of code word distance schedules to last shop sign in the form of a streamer pre-encoding codeword.I.e. by with codebook set
In code word correspondingly find out the code word the most similar to channel estimation code word, and as sub- pre-encoding codeword it is expected, compare
Mode can also be a lot, for example, some other artificial treatment side can also be used by general Mathematical treatment mode
Formula.
Similarly, also there is identical processing mode when calculating and leaking sub- pre-encoding codeword, for example, by the end under cooperative base station
Channel matrix between end and serving BS carries out singular value decomposition, obtains channel estimation code word matrix；Ergodic channels estimate code word
Channel estimation code word in matrix, obtain the distance of channel estimation code word and code word in code book；Determine the maximum letter of code word distance
Road estimation code word is the sub- pre-encoding codeword of leakage.
As another preferably embodiment, serving BS, can be right when obtaining the first precoding according to convolutional coding structure
First precoding is corrected, to improve the accuracy rate of precoding.Such as：It can be corrected using equation below：When
When
Wherein,Referring to the precoding of current time frequency unit, q identifies the state of precoding,Refer to previous time frequency unit
Precoding, NRBRepresent the resource block sum used in certain user, nRBRepresent the resource block sequence number in resource set, and nRB=1,
2,…NRB。
As another preferably embodiment, sent out in serving BS using the first precoding after correction as serving BS
Penetrate after the second pre-encoding codeword that signal uses, precoding processing is carried out to transmission signal according to the second pre-encoding codeword.It is logical
Such processing is crossed, expectation precoding can be made it is expected the energy centralization of the upward transmission signal of subscriber side terminal (in other words
Transmission power is concentrated), and value of the transmission signal in precoding on its interference radiating way is leaked as far as possible close to zero, use edge
Family obtains signal to noise ratio as high as possible, and certain suppression is obtained on interference radiating way.
It should be noted that can be in such as one group of computer executable instructions the flow of accompanying drawing illustrates the step of
Performed in computer system, although also, show logical order in flow charts, in some cases, can be with not
The order being same as herein performs shown or described step.
In another embodiment, a kind of coordinated multipoint transmission precoding processing software is additionally provided, the software is used for
Technical scheme described in execution above-described embodiment and preferred embodiment.
In another embodiment, a kind of storage medium is additionally provided, above-mentioned multiple spot association is stored with the storage medium
Make transfer pre-coding processing software, the storage medium includes but is not limited to：CD, floppy disk, hard disk, scratch pad memory etc..
The embodiment of the present invention additionally provides a kind of coordinated multipoint transmission precoding processing device, and the coordinated multipoint transmission prelists
Code processing unit can be used for realizing above-mentioned coordinated multipoint transmission recoding processing method and preferred embodiment, carry out
Illustrate, repeat no more, the module being related in the coordinated multipoint transmission precoding processing is illustrated below.Such as following institute
Use, term " module " can realize the combination of the software and/or hardware of predetermined function.Although described by following examples
System and method are preferably realized with software, but hardware, or the combination of software and hardware realization be also may and quilt
Conception.
Fig. 3 is the structured flowchart of coordinated multipoint transmission precoding processing device according to embodiments of the present invention, such as Fig. 3 institutes
Show, the device includes：Receiving module 32, selecting module 34, convolution operation module 36 and processing module 38, below to said structure
It is described in detail.
Receiving module 32, the sub- pre-coding matrix index of expectation and cooperative base station for receiving terminal send in cooperation base
The sub- pre-coding matrix index of leakage of terminal under standing, wherein, it is expected that sub- pre-coding matrix index correspondingly it is expected that terminal side is upward
Coding codeword, leak sub- pre-coding matrix index and correspond to coding codeword on interference radiating way；Selecting module 34, it is connected to reception
Module 32, the sub- pre-coding matrix index selection of expectation for being received according to receiving module 32 it is expected coding codeword and according to letting out
The selection of flaw pre-coding matrix index leaks sub- pre-encoding codeword；Convolution operation module 36, selecting module 34 is connected to, for inciting somebody to action
The expectation coding codeword that selecting module 34 obtains obtains the first pre-encoding codeword with leaking sub- pre-encoding codeword progress convolution operation；
Processing module 38, convolution operation module 36 is connected to, for the first precoding for obtaining the convolution operation module 36 after correction
The second pre-encoding codeword that code word uses as transmission signal.
The embodiment of the present invention additionally provides a kind of coordinated multipoint transmission precoding processing system, and the coordinated multipoint transmission prelists
Code processing system can be used for realizing above-mentioned coordinated multipoint transmission recoding processing method and preferred embodiment, carry out
Illustrate, repeat no more, the module being related in the coordinated multipoint transmission precoding processing system is illustrated below.Such as with
Used in lower, term " module " can realize the combination of the software and/or hardware of predetermined function.Although following examples are retouched
The system and method stated preferably are realized with software, but hardware, or the realization of the combination of software and hardware is also possible
And be contemplated.
Fig. 4 is the structured flowchart of coordinated multipoint transmission precoding processing system according to embodiments of the present invention, such as Fig. 4 institutes
Show, the system includes serving BS 42, and the serving BS can use above-mentioned coordinated multipoint transmission precoding processing device
422, the system also includes the terminal 44 under serving BS, and the terminal 44 under the serving BS includes：First estimation module 442,
First computing module 444, the first acquisition module 446, said structure is described in detail below.
First estimation module 442, for estimating the channel matrix of channel between terminal and the serving BS where estimation module；
First computing module 444, the first estimation module 442 is connected to, for the terminal obtained according to the first estimation module 442 and service
Channel matrix between base station, which calculates, it is expected sub- pre-encoding codeword；First acquisition module 446, the first computing module 444 is connected to, used
Obtained in the sub- pre-encoding codeword of expectation obtained according to the first computing module 444 and it is expected sub- pre-coding matrix index.
Fig. 5 is the preferable structured flowchart of coordinated multipoint transmission precoding processing system according to embodiments of the present invention, such as Fig. 5
Shown, the system also includes：Terminal 52 under cooperative base station corresponding to serving BS, wherein, cooperation base corresponding to serving BS
Terminal 52 under standing includes：Second estimation module 522, the second computing module 524 and the second acquisition module 526；First calculates mould
Block 444 includes：First decomposing module 4442, the first spider module 4444 and the first determining module 4446；Second computing module 524
Including：Second decomposing module 5242, the second spider module 5244 and the second determining module 5246, said structure is carried out below detailed
Thin description.
Second estimation module 522, for estimating the terminal under cooperative base station and the channel matrix between serving BS；Second meter
Module 524 is calculated, is connected to the second estimation module 522, for the end under the cooperative base station that is obtained according to the second estimation module 522
Channel matrix between end and serving BS, which calculates, leaks sub- pre-encoding codeword；Second acquisition module 526, it is connected to the second calculating mould
Block 524, the sub- pre-encoding codeword of leakage for being obtained according to the second computing module 524, which obtains, leaks sub- pre-coding matrix index.
Preferably, first computing module 444 can include：First decomposing module 4442, for by under the serving BS
Terminal and the serving BS between channel matrix carry out singular value decomposition, obtain channel estimation code word matrix；First traversal mould
Block 4444, the first decomposing module 4442 is connected to, the channel estimation code word matrix obtained for traveling through the first decomposing module 4442
In channel estimation code word, obtain the distance of code word in the channel estimation code word and code book；First determining module 4446, is connected to
First spider module 4444, for determining that the minimum channel estimation code word of the code word distance that the first spider module 4444 obtains schedules to last
Shop sign in the form of a streamer pre-encoding codeword.
Preferably, second computing module 524 includes：Second decomposing module 5242, for by the end under the cooperative base station
Channel matrix between end and serving BS carries out singular value decomposition, obtains channel estimation code word matrix；Second spider module 5244,
The second decomposing module 5242 is connected to, the channel in the channel estimation code word matrix obtained for traveling through the second decomposing module 5242
Estimate code word, obtain the distance of the channel estimation code word and code word in code book；Second determining module 5246, is connected to the second traversal
Module 5244, for determining that the maximum channel estimation code word of the code word distance that the second spider module 5244 obtains prelists for leakage
Code code word.
Illustrated below in conjunction with preferred embodiment, preferred embodiment below combines above-described embodiment and is preferable to carry out
Mode.
Preferred embodiment one
It is an object of the invention to provide a kind of CoMP precoding implementation methods based on code word correction, believed according to channel
Breath, using the correlation between resource block, for the precoding acted on continuous several resource blocks, using based on standard precoding code
The mode of word correction obtains so that in less feedback data amount, pre-coding matrix is recovered in transmitting terminal (or use
Pre-coding matrix group substitutes single pre-coding matrix) to improve systematic function.This method is illustrated below.
It should be noted that in the preferred embodiment, it is assumed that there is K eNB, each cell only serves a UE, and
The UE of each cell serves uses same running time-frequency resource, and each eNB is respectively provided with M root transmitting antennas, and k-th of user includes Nk roots
Reception antenna, user k need to transmit mkIndividual independent data flow.Certain eNBkThe signal that (k=1,2 ... K) is sent is represented by M dimensions
Column vector Wksk, wherein, WkFor user k M × mkPre-coding matrix is tieed up, and is metTr () represents mark fortune
Calculate, superscript H represents conjugate transposition computing, skIt is user k mkDimension transmitting symbolic vector.
For two cell two users, it is assumed that user UE1For expectation user without loss of generality, then to user UE1Precoding
Implementation process be described as follows：
S1：Estimate channel.
To serving BS eNB1For, this community user UE1Estimation and serving BS eNB1Between channel matrix H11And with association
Make base station eNB2Between channel matrix H12。
To cooperative base station eNB2For, this community user UE2Estimation and serving BS eNB2Between channel matrix H22And with association
Make base station eNB1Between channel matrix H21。
S2：Calculate and it is expected sub- pre-encoding codeword.
(1) in UE1Side, from the code book of precoding (as determined in LTE protocol) the inner code chosen code word, travel through in code book
Word Wi(wherein i is the code word sequence number in corresponding code book).
By channel matrix H11Singular value decomposition is carried out, i.e.,Obtain channel estimation code word matrix：WhereinFor V11Preceding mkRow, H11It is UE1 user and this cell base station eNB1Between Nk× M ties up channel square
Battle array, U11It is Nk× M ties up unitary matrice, V11It is that M × M ties up unitary matrice, ∈11=diag (σ1,σ2,...σr), r=rank (H11), diag
Diagonal matrix is represented, rank represents order computing, σ1,σ2,...σrIt is channel matrix H11Singular value.
Then ergodic channels estimation code word WH11With code word W in code bookiDistance, code word distance it is minimum be it is expected son
The estimate W of pre-encoding codeword11：Wherein superscript " * " represents altogether
Yoke operator, | | represent to take the value of determinant.Represent corresponding | | determinant is absolute
The minimum codeword selection of value schedules to last the estimate W of shop sign in the form of a streamer pre-encoding codeword11, corresponding pre-coding matrix index is PMI11, UE1
PMI is fed back to this cell base station eNB111。
It is similar, in UE2Side, by channel matrix H22Singular value decomposition is carried out, obtains channel estimation code word matrixEnter one
Step obtains it is expected sub- pre-encoding codeword W22：Corresponding precoding square
Battle array index is PMI22, UE2To this cell base station eNB2Feed back PMI22。
S3, estimation leak sub- pre-encoding codeword.
In UE1Side, from the code book of precoding (as determined in LTE protocol) the inner code word W chosen code word, travel through in code booki
(wherein i is the code word sequence number in corresponding code book), by channel matrix H12Singular value decomposition is carried out, obtains channel estimation code word matrixFurther calculate channel estimation code wordWith code word W in code bookiDistance, code word distance it is maximum be then leakage
Pre-encoding codeword W12：Wherein superscript " * " represents adjoint operator, | |
Expression takes the value of determinant.Represent corresponding | | the code of determinant maximum absolute value
Word selection is to reveal the estimate W of sub- pre-encoding codeword12, corresponding pre-coding matrix index is WCI12, UE1To this cell base station
eNB1Feed back WCI12。
It is similar, in UE2Side, by channel matrix H21Singular value decomposition is carried out, obtains channel estimation code word matrixEnter one
Step obtains leaking sub- pre-encoding codeword W21：Corresponding pre-coding matrix
Index is WCI21, UE2To this cell base station eNB2Feed back WCI21。
S4, information exchange.
Serving BS eNB1With cooperative base station eNB2By interface (X2 interface) interactive channel information between base station and base station,
That is base station eNB1To base station eNB2Transmit pre-coding matrix index WCI12, base station eNB2To base station eNB1Transmit pre-coding matrix rope
Draw WCI21。
S5, construct pre-encoding codeword.
It will it is expected sub- pre-encoding codeword W in base station eNB 111With leaking sub- pre-encoding codeword W21Carry out convolution, gained matrix
As pre-encoding codeword.So as to ensure to it is expected that subscriber signal power is maximum, AF panel is to leveling off to zero.For cell eNB1
Corresponding this community user UE1, adjacent cell user UE2Precoding, i.e.,In formulaRepresent to matrix W11And matrix W21Convolution is sought, and ranks and W are taken in matrix of consequence core11Phase
Same part forms matrix.
S6, pre-encoding codeword is corrected.It can be corrected using equation below.
When
When
Wherein,Referring to the precoding of current time frequency unit, q identifies the state of precoding,Refer to previous time frequency unit
Precoding, NRBRepresent the resource block sum used in certain user, nRBRepresent the resource block sequence number in resource set, and nRB=1,
2,…NRB。
Step S7：Launch after signal is carried out into precoding.
By this preferred embodiment, in LTE-Advanced system CoMP precodings, according to the precoding square of UE feedbacks
Pre-encoding codeword it is expected in battle array index, selection, the pre-coding matrix index to be come by adjacent cell interaction, selection leakage precoding code
It word, then will it is expected that pre-encoding codeword matrix carries out convolution with leakage pre-encoding codeword matrix and obtains precoding, and this prelisted
Code is corrected, and can be ensured to it is expected that subscriber signal power is maximum, and AF panel is to leveling off to zero.
Preferred embodiment two
In the CoMP precodings of this preferred embodiment, while consider larger same of pre-coding gain of this community user
When, also take into account zero leakage of the adjacent cell with time-frequency resource user, according to channel information, when constructing pre-encoding codeword, will to
The precoding processing of family transmission signal is equivalent to it is expected that pre-encoding codeword with leaking the convolution form of pre-encoding codeword, it is expected to prelist
Code is upwardly formed energy centralization in expectation user side, and leaks precoding and be then upwardly formed zero leakage in each disturber, so as to
It is expected user's receiving terminal acquisition Signal to Interference plus Noise Ratio as high as possible, while suppress interference on each interference radiating way.
Illustrated in the preferred embodiment in case of two base station cells, it is necessary to illustrate, it is excellent at this
Select CoMP precoding implementation methods under two cell scenarios provided in embodiment, wherein eNB1, eNB2 transmitting antenna number are equal
For 4, UE1、UE2Reception antenna is 2, and each UE number of plies is multipoint cooperative according to the preferred embodiment of the invention for 2, Fig. 6
The flow chart of transfer pre-coding processing method, as shown in fig. 6, the flow comprises the following steps：
Step S602, estimate base station eNB1With this community user UE1Between channel matrix H11, and base station eNB1With adjacent cell
User UE2Between channel matrix H21。
To cooperation cell eNB2For, estimate cooperation cell eNB2With this community user UE2Between channel matrix H22And cooperation
Cell eNB2With adjacent cell user UE2Between channel matrix H12。
Step S604, pre-encoding codeword it is expected in estimation, in UE1Side, by channel matrix H11Singular value decomposition is carried out, i.e.,Obtain channel estimation code word matrix：Wherein V11,[2]For V11Preceding 2 row of matrix, H11It is
2 × 4 dimension channel matrixes between UE1 user and this cell base station eNB1, U11Be 2 × 4 dimension unitary matrice, V11It is 4 × 4 dimension unitary matrice,
∈11=diag (σ1,σ2), 2=rank (H11), diag () represents diagonal matrix, and rank () represents order computing, σ1,σ2It is channel square
Battle array H11Singular value.
Then ergodic channels estimation code wordWith the distance of a certain code word in code book, code word distance is minimum as it is expected
The estimate W of sub- pre-encoding codeword11：Wherein superscript " * " represents
Adjoint operator, | | represent to take the value of determinant.Represent corresponding | | determinant is exhausted
The estimate W of shop sign in the form of a streamer pre-encoding codeword is scheduled to last to the minimum codeword selection of value11, corresponding pre-coding matrix index is PMI11,
UE1 feeds back PMI to this cell base station eNB111。
Similarly, in UE2Side, obtain it is expected sub- pre-encoding codeword W22：
Corresponding pre-coding matrix index is PMI22, UE2To this cell base station eNB2Feed back PMI22。
Step S606, estimation leakage pre-encoding codeword W12。
Estimation leakage pre-encoding codeword, in UE1 sides, from the code book of precoding (as determined in LTE protocol) inner access code
Word, travel through the code word W in code booki(wherein i is the code word sequence number pre-encoding codeword W in corresponding code book12：Wherein superscript " * " represents adjoint operator, | | expression takes determinant
Value.Represent corresponding | | the codeword selection of determinant maximum absolute value is leakage
The estimate W of sub- pre-encoding codeword12, corresponding pre-coding matrix index is WCI12, UE1To this cell base station eNB1Feedback
WCI12。
It is similar, in UE2 sides, obtain leaking sub- pre-encoding codeword W21：
Corresponding pre-coding matrix index is WCI21, UE2 to this cell base station eNB2 feed back WCI21。
Step S608, information exchange, serving BS eNB1 and cooperative base station eNB2 pass through X2 mouth interactive channel information, i.e. base
The eNB1 that stands transmits pre-coding matrix index WCI to base station eNB 212, base station eNB 2 to base station eNB 1 transmit pre-coding matrix index
WCI21。
Step S610：Pre-encoding codeword is constructed, by it is expected sub- pre-encoding codeword W11With leaking pre-encoding codeword W21Between
Mapping, corresponding this community user UE1 of base station eNB 1, adjacent cell user UE2 pre-encoding codeword are obtained, i.e.,In formulaRepresent to matrix W11And matrix W21Convolution is sought, and in result
Matrix central part takes ranks and W11Size identical part forms matrix.
Step S612：Pre-encoding codeword is corrected.
In LTE (or LTE-Adv) system, OFDM symbol cyclic prefix can not possibly be very long, inevitable between resource block
Ground has certain correlation, therefore can extend feedback information using the correlation between resource block.When realizing, it will feed back
Pre-coding matrix of the pre-coding matrix arrived as the resource block among resource block group, the pre-coding matrix of other Adjacent resource blocks
Obtained by interpolation.
That is, the precoding after correction
When
When
Wherein,Referring to the precoding of current time frequency unit, superscript q identifies the state of precoding,When referring to previous
The precoding of frequency unit, NRBRepresent the resource block sum used in certain user, nRB(nRB=1,2 ... NRB) represent resource set in money
Source block sequence number, that is, what is obtained after correcting is one group of precoding, the corresponding resource block of each precoding in group.
Step S614：Precoding processing, for base station eNB 1, the pre-encoding codeword obtained according to estimation is to transmission signal x
Precoding processing is carried out, i.e.,Wherein xnRBFor in signal x n-thRBSequence number resource block pair
The signal answered.
For cooperative base station eNB2, its processing procedure and base station eNB1It is similar, it is not further described.
Fig. 7 is the schematic diagram of the CoMP precoding implementation results according to embodiments of the present invention based on code book, such as Fig. 7 institutes
Show, for serving BS eNB1, energy centralization is to this community user UE after precoding1, null trend adjacent cell user UE2；For
Cooperative base station eNB2, energy centralization is to this community user UE after precoding2, null trend adjacent cell user UE1。
A kind of precoding realization device is additionally provided in the preferred embodiment, applied to LTE-Advanced systems.Fig. 8
It is the structured flowchart of CoMP pre-coding apparatus according to the preferred embodiment of the invention, as shown in figure 8, the device includes：Channel is estimated
Module 80 is counted, it is expected pre-encoding codeword and leaks pre-encoding codeword estimation and feedback module 82, channel information interactive module 84, in advance
Code construction module 86, precoding correction module 88 and precoding processing module 88, said structure is described in detail below.
Channel estimation module 80, for service cell eNB1, for estimating user UE1 and base station eNB1Between channel matrix
H11；And estimation user UE1With base station eNB2Between channel matrix H12。
Equally, to cooperation cell UE2For, for estimating user UE2With base station eNB2Between channel matrix H22；And estimation
User UE2 and base station eNB1Between channel matrix H21。
It is expected pre-encoding codeword and the estimation of leakage pre-encoding codeword and feedback module 82, be connected to channel estimation module 80,
For being established according to the output channel of channel estimation module 80 with it is expected precoding and leaking the relation for the intersymbol that prelists.
Channel information interactive module 84, it is connected to and it is expected pre-encoding codeword and the estimation of leakage pre-encoding codeword and feedback module
82, the interaction for channel information is transmitted.
Precoding constructing module 86, channel information interactive module 84 is connected to, for generating pre-encoding codeword.
Pre-encoding codeword correction module 88, precoding constructing module 86 is connected to, for being corrected to pre-encoding codeword.
Precoding processing module 89, pre-encoding codeword correction module 88 is connected to, for the CoMP precodings in cell.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, so as to being stored in
Performed in storage device by computing device, they are either fabricated to each integrated circuit modules respectively or by them
Multiple modules or step be fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hard
Part and software combine.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (13)
- A kind of 1. coordinated multipoint transmission recoding processing method, it is characterised in that including：Serving BS receives the sub- pre-coding matrix index of expectation of the terminal under the serving BS and cooperative base station is sent in institute The sub- pre-coding matrix index of leakage of the terminal under cooperative base station is stated, wherein, it is described it is expected that sub- pre-coding matrix index corresponds to the phase The upward coding codeword of terminal side is hoped, the sub- pre-coding matrix index of leakage corresponds to the coding codeword on interference radiating way；The serving BS it is expected that sub- pre-encoding codeword it is expected in sub- pre-coding matrix index selection according to described, and is let out according to described The selection of flaw pre-coding matrix index leaks sub- pre-encoding codeword；The serving BS it is expected that sub- pre-encoding codeword carries out convolution operation with the sub- pre-encoding codeword of leakage and obtained by described First pre-encoding codeword；The serving BS first pre-encoding codeword after correction is used as the serving BS transmission signal Two pre-encoding codewords.
- 2. according to the method for claim 1, it is characterised in that receive the phase of the terminal under the serving BS in serving BS Before shop sign in the form of a streamer pre-coding matrix index, in addition to：Terminal under the serving BS estimates the terminal under the serving BS and the channel matrix between the serving BS；Calculated according to the channel matrix between the terminal under the serving BS and the serving BS and it is expected sub- pre-encoding codeword；It is expected that sub- pre-encoding codeword obtains the sub- pre-coding matrix index of expectation according to described.
- 3. according to the method for claim 2, it is characterised in that according to the terminal under the serving BS and the service base Channel matrix between standing, which calculates, it is expected that sub- pre-encoding codeword includes：Channel matrix between terminal under the serving BS and the serving BS is subjected to singular value decomposition, channel is obtained and estimates Count code word matrix；The channel estimation code word in the channel estimation code word matrix is traveled through, obtains the channel estimation code word and code word in code book Distance；Determine that the minimum channel estimation code word of code word distance schedules to last shop sign in the form of a streamer pre-encoding codeword.
- 4. according to the method for claim 1, it is characterised in that in the reception cooperative base station transmission in the cooperation base Before the sub- pre-coding matrix index of leakage of terminal under standing, in addition to：Terminal under the cooperative base station estimates the terminal under the cooperative base station and the channel matrix between serving BS；Calculated according to the terminal under the cooperative base station and the channel matrix between serving BS and leak sub- pre-encoding codeword；Obtained according to the sub- pre-encoding codeword of leakage and leak sub- pre-coding matrix index.
- 5. according to the method for claim 4, it is characterised in that according between the terminal under the cooperative base station and serving BS Channel matrix calculate and leak sub- pre-encoding codeword and include：Terminal under the cooperative base station and the channel matrix between serving BS are subjected to singular value decomposition, obtain channel estimating code Word matrix；The channel estimation code word in the channel estimation code word matrix is traveled through, obtains the channel estimation code word and code word in code book Distance；The maximum channel estimation code word of code word distance is determined to leak sub- pre-encoding codeword.
- 6. method according to any one of claim 1 to 5, it is characterised in that the serving BS uses equation below First precoding is corrected：WhenWhenWherein,For the precoding after correction, W1 (q)Refer to the precoding of current time frequency unit, q identifies the state of precoding, W1 (q-1)Refer to the precoding of previous time frequency unit, NRBRepresent the resource block sum used in certain user, nRBRepresent the resource in resource set Block sequence number, and nRB=1,2 ... NRB。
- 7. method according to any one of claim 1 to 5, it is characterised in that after the serving BS is by correction It is pre- according to described second after the second pre-encoding codeword that first precoding uses as the serving BS transmission signal Coding codeword carries out precoding processing to transmission signal.
- A kind of 8. coordinated multipoint transmission precoding processing device, applied to serving BS, it is characterised in that including：Receiving module, the sub- pre-coding matrix index of expectation and cooperative base station for receiving terminal send in the cooperative base station Under terminal the sub- pre-coding matrix index of leakage, wherein, it is described it is expected that sub- pre-coding matrix index correspondingly it is expected terminal direction On coding codeword, the sub- pre-coding matrix index of the leakage corresponds to the coding codeword on interference radiating way；Selecting module, for it is expected sub- pre-encoding codeword according to the sub- pre-coding matrix index selection of the expectation and being let out according to described The selection of flaw pre-coding matrix index leaks sub- pre-encoding codeword；Convolution operation module, for it is expected that sub- pre-encoding codeword carries out convolution operation with the sub- pre-encoding codeword of leakage by described Obtain the first pre-encoding codeword；Processing module, for the second precoding code for using first pre-encoding codeword after correction as transmission signal Word.
- 9. a kind of coordinated multipoint transmission precoding processing system, the system includes serving BS, and the serving BS includes root According to the coordinated multipoint transmission precoding processing device described in claim 8, it is characterised in that the system also includes：The clothes The terminal being engaged under base station, the terminal under the serving BS include：First estimation module, for estimating the channel square of channel between terminal and the serving BS where the estimation module Battle array；First computing module, it is expected sub- precoding code for being calculated according to the channel matrix between the terminal and the serving BS Word；First acquisition module, for it is expected that sub- pre-encoding codeword obtains the sub- pre-coding matrix index of expectation according to described.
- 10. system according to claim 9, it is characterised in that first computing module includes：First decomposing module, it is unusual for the channel matrix between the terminal under the serving BS and the serving BS to be carried out Value is decomposed, and obtains channel estimation code word matrix；First spider module, for traveling through the channel estimation code word in the channel estimation code word matrix, obtain the channel and estimate Count the distance of code word and code word in code book；First determining module, for determining that the minimum channel estimation code word of code word distance schedules to last shop sign in the form of a streamer pre-encoding codeword.
- 11. system according to claim 9, it is characterised in that the system also includes：Assisted corresponding to the serving BS Make the terminal under base station, wherein, the terminal under cooperative base station corresponding to the serving BS includes：Second estimation module, for estimating the terminal under the cooperative base station and the channel matrix between serving BS；Second computing module, for calculating leakage according to the terminal under the cooperative base station and the channel matrix between serving BS Pre-encoding codeword；Second acquisition module, it is additionally operable to obtain the sub- pre-coding matrix index of leakage according to the sub- pre-encoding codeword of leakage.
- 12. system according to claim 11, it is characterised in that second computing module includes：Second decomposing module, for the terminal under the cooperative base station and the channel matrix between serving BS to be carried out into singular value point Solution, obtains channel estimation code word matrix；Second spider module, for traveling through the channel estimation code word in the channel estimation code word matrix, obtain the channel and estimate Count the distance of code word and code word in code book；Second determining module, for determining the maximum channel estimation code word of code word distance for the sub- pre-encoding codeword of leakage.
- 13. system according to claim 9, it is characterised in that the coordinated multipoint transmission precoding processing device also wraps Precoding module is included, and the precoding module is used to transmission signal is carried out at precoding according to second pre-encoding codeword Reason.
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