CN103036602A - Method, device and system for multipoint cooperation transmission precoding processing - Google Patents
Method, device and system for multipoint cooperation transmission precoding processing Download PDFInfo
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Abstract
The invention discloses a method, a device and a system for multipoint cooperation transmission precoding processing. The method comprises that a service base station receives an expected branch precoding matrix index of a terminal under the service base station and a leakage branch precoding matrix index of a terminal under a cooperation base station, which is sent by the cooperation base station; the service base station chooses expected encoding code words according to the expected branch precoding matrix index and chooses leakage branch precoding code words according to the leakage branch precoding matrix index; the service base station convolves the expected encoding code words and the leakage branch precoding code words to acquire first precoding code words; and the service base station regards the rectified first precoding code words as second precoding code words used for sending signals of the service base station. When the technology of coordinated multiple points (CoMP) is used, the effects that interfere of edge user terminals is lowered and accuracy is greatly improved are achieved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of coordinated multipoint transmission recoding processing method, Apparatus and system.
Background technology
At third generation partner program (3rd Generation Partnership Project, referred to as 3GPP) Long Term Evolution (Long Term Evolution-Advanced, referred to as LTE-A) in the system, coordinated multipoint transmission (Coordinated Multiple Point, referred to as CoMP) technology can solve presence of intercell interference, improves cell edge and cell spectrum efficient.This technology is mainly for Cell Edge User, mutual by mobile subscriber's channel information between adjacent base station, adjacent base station takes certain interference avoidance strategy or a plurality of base station that the mobile subscriber is carried out the interference that joint transmission reduces edge customer to disturbed user, improves throughput and the spectrum utilization efficiency of cell edge data.
Fig. 1 is the application schematic diagram of CoMP technology in the correlation technique, and as shown in Figure 1, there are serving BS, cooperative base station in the base station.Wherein, H
11The expression service cell eNB
1To this community user UE
1Channel, H
21The expression service cell eNB
1To adjacent cell user UE
2Channel.Equally, H
22Expression cooperation cell eNB
2To this community user UE
2Channel, H
12Expression cooperation cell eNB
2To adjacent cell user UE
1Channel.
Usually, the CoMP uplink feedback adopts the form of partial feedback, i.e. the UE channel matrix that not exclusively feeds back the channel matrix of this residential quarter and not exclusively feed back adjacent cell, but feedback fraction channel information.Specifically, UE feeds back pre-coding matrix index (the Precoding Matrix Indicator of this cell channel, referred to as PMI), UE also feeds back the poorest precoding index (the Worst Companion Indicator to adjacent cell channel, referred to as WCI) realize the CoMP of terminal spatial domain Inter-Cell Interference Coordination, but code book optimizing mode is loaded down with trivial details when adopting the CoMP technology in the correlation technique, reduces the edge customer terminal when causing CoMP to realize and disturbs the not high problem of accuracy rate.
Summary of the invention
Code book optimizing mode is loaded down with trivial details when adopting the CoMP technology in the correlation technique, reduce the edge customer terminal when causing CoMP to realize and disturb the not high problem of accuracy rate, the invention provides a kind of coordinated multipoint transmission recoding processing method, Apparatus and system, to address the above problem at least.
According to an aspect of the present invention, a kind of coordinated multipoint transmission recoding processing method is provided, comprise: serving BS receives the sub-pre-coding matrix index of expectation of the terminal under this serving BS and the sub-pre-coding matrix index of leakage of the terminal under described cooperative base station that cooperative base station sends, wherein, the coding codeword that the described expectation corresponding expectation of sub-pre-coding matrix index terminal side makes progress, the coding codeword on the corresponding interference radiating way of the sub-pre-coding matrix index of described leakage; Described serving BS is selected the expectation coding codeword and is selected to leak sub-pre-encoding codeword according to the sub-pre-coding matrix index of described leakage according to the sub-pre-coding matrix index of described expectation; Described serving BS carries out convolution operation with described expectation coding codeword and the sub-pre-encoding codeword of described leakage and obtains the first pre-encoding codeword; The second pre-encoding codeword that described the first precoding after described serving BS will be proofreaied and correct transmits and uses as described serving BS.
Preferably, receive at serving BS before the sub-pre-coding matrix index of expectation of the terminal under this serving BS, also comprise: the terminal under the described serving BS is estimated terminal under the described serving BS and the channel matrix between described serving BS; According to the channel matrix given period shop sign in the form of a streamer pre-encoding codeword between the terminal under the described serving BS and described serving BS; Obtain the sub-pre-coding matrix index of expectation according to the sub-pre-encoding codeword of described expectation.
Preferably, before receiving the sub-pre-coding matrix index of the leakage in the terminal under the described cooperative base station that described cooperative base station sends, also comprise: the terminal under the described cooperative base station is estimated terminal under the described cooperative base station and the channel matrix between serving BS; Calculate the sub-pre-encoding codeword of leakage according to the terminal under the described cooperative base station and the channel matrix between serving BS; Obtain the sub-pre-coding matrix index of leakage according to the sub-pre-encoding codeword of described leakage.
Preferably, comprise according to the channel matrix given period shop sign in the form of a streamer pre-encoding codeword between the terminal under the described serving BS and described serving BS: the channel matrix between the terminal under the described serving BS and described serving BS is carried out singular value decomposition, obtain channel estimating code word matrix; Travel through the channel estimating code word in the described channel estimating code word matrix, obtain the distance of code word in described channel estimating code word and the code book; Determine that code word schedules to last the shop sign in the form of a streamer pre-encoding codeword apart from the channel estimating code word of minimum.
Preferably, comprise according to the terminal under the described cooperative base station and the sub-pre-encoding codeword of the calculating of the channel matrix between serving BS leakage: the terminal under the described cooperative base station and the channel matrix between serving BS are carried out singular value decomposition, obtain channel estimating code word matrix; Travel through the channel estimating code word in the described channel estimating code word matrix, obtain the distance of code word in described channel estimating code word and the code book; Determine that code word is the sub-pre-encoding codeword of leakage apart from the channel estimating code word of maximum.
Preferably, described serving BS uses following formula that described the first precoding is proofreaied and correct:
When
Preferably, described the first precoding after described serving BS will be proofreaied and correct transmits as described serving BS after the second pre-encoding codeword that uses, and carries out precoding processing to transmitting according to described the second pre-encoding codeword.
According to a further aspect in the invention, a kind of coordinated multipoint transmission precoding processing device is provided, comprise: receiver module, be used for the sub-pre-coding matrix index of expectation of receiving terminal and the sub-pre-coding matrix index of leakage of the terminal under described cooperative base station that cooperative base station sends, wherein, the coding codeword that the described expectation corresponding expectation of sub-pre-coding matrix index terminal side makes progress, the coding codeword on the corresponding interference radiating way of the sub-pre-coding matrix index of described leakage; Select module, be used for selecting the expectation coding codeword and selecting to leak sub-pre-encoding codeword according to the sub-pre-coding matrix index of described leakage according to the sub-pre-coding matrix index of described expectation; The convolution operation module is used for that described expectation coding codeword and the sub-pre-encoding codeword of described leakage are carried out convolution operation and obtains the first pre-encoding codeword; Processing module, described the first pre-encoding codeword after being used for proofreading and correct is as the second pre-encoding codeword that transmits and use.
In accordance with a further aspect of the present invention, a kind of coordinated multipoint transmission precoding processing system also is provided, system comprises serving BS, this serving BS comprises above-mentioned coordinated multipoint transmission precoding processing device, this system also comprises: the terminal under the described serving BS, terminal under the described serving BS comprises: the first estimation module, for the channel matrix of channel between the terminal of estimating described estimation module place and described serving BS; The first computing module is used for according to the channel matrix given period shop sign in the form of a streamer pre-encoding codeword between described terminal and described serving BS; The first acquisition module is used for obtaining the sub-pre-coding matrix index of expectation according to the sub-pre-encoding codeword of described expectation.
Preferably, described system also comprises: the terminal under cooperative base station corresponding to described serving BS, wherein, the terminal under cooperative base station corresponding to described serving BS comprises: the second estimation module is used for estimating terminal under the described cooperative base station and the channel matrix between serving BS; The second computing module is used for calculating the sub-pre-encoding codeword of leakage according to the terminal under the described cooperative base station and the channel matrix between serving BS; The second acquisition module also is used for obtaining the sub-pre-coding matrix index of leakage according to the sub-pre-encoding codeword of described leakage.
Preferably, described the first computing module comprises: the first decomposing module, be used for the channel matrix between the terminal under the described serving BS and described serving BS is carried out singular value decomposition, and obtain channel estimating code word matrix; The first spider module for the channel estimating code word that travels through described channel estimating code word matrix, obtains the distance of code word in described channel estimating code word and the code book; The first determination module is used for determining that code word schedules to last the shop sign in the form of a streamer pre-encoding codeword apart from the channel estimating code word of minimum.
Preferably, described the second computing module comprises: the second decomposing module, also be used for the terminal under the described cooperative base station and the channel matrix between serving BS are carried out singular value decomposition, and obtain channel estimating code word matrix; The second spider module also for the channel estimating code word that travels through described channel estimating code word matrix, obtains the distance of code word in described channel estimating code word and the code book; The second determination module is used for also determining that code word is the sub-pre-encoding codeword of leakage apart from the channel estimating code word of maximum.
Preferably, described coordinated multipoint transmission precoding processing device also comprises precoding module, and described precoding module is used for carrying out precoding processing to transmitting according to described the second pre-encoding codeword.
By the present invention, adopt serving BS to receive the sub-pre-coding matrix index of expectation of the terminal under this serving BS and the sub-pre-coding matrix index of leakage of the terminal under cooperative base station that cooperative base station sends, wherein, expect the coding codeword that the corresponding expectation of sub-pre-coding matrix index terminal side makes progress, leak the coding codeword on the corresponding interference radiating way of sub-pre-coding matrix index; Serving BS is selected the expectation coding codeword and is selected to leak sub-pre-encoding codeword according to leaking sub-pre-coding matrix index according to the sub-pre-coding matrix index of expectation; Serving BS will expect that coding codeword and the sub-pre-encoding codeword of leakage carry out convolution operation, obtain pre-encoding codeword, and this pre-encoding codeword proofreaied and correct, code book optimizing mode is loaded down with trivial details when having solved available technology adopting CoMP technology, reduce the edge customer terminal when causing CoMP to realize and disturb the not high problem of accuracy rate, and then when having reached employing CoMP technology, make and reduce the edge customer terminal and disturb the larger raising effect of accuracy rate.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of two residential quarter two users' application scenarioss of the CoMP precoding of correlation technique;
Fig. 2 is the flow chart according to the coordinated multipoint transmission recoding processing method of the embodiment of the invention;
Fig. 3 is the structured flowchart according to the coordinated multipoint transmission precoding processing device of the embodiment of the invention;
Fig. 4 is the structured flowchart according to the coordinated multipoint transmission precoding processing system of the embodiment of the invention;
Fig. 5 is the preferred structured flowchart of coordinated multipoint transmission precoding processing system according to the embodiment of the 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 the realization effect schematic diagram of the CoMP precoding of proofreading and correct based on code word according to the preferred embodiment of the invention; And
Fig. 8 is the structured flowchart of the CoMP precoding implement device proofreaied and correct based on code word according to the preferred embodiment of the invention.
Embodiment
Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
A kind of coordinated multipoint transmission recoding processing method is provided in the present embodiment, and Fig. 2 is the flow chart according to the coordinated multipoint transmission recoding processing method of the embodiment of the invention, and as shown in Figure 2, this flow process comprises the steps that S202 is to step S208.
Step S202: serving BS receives the sub-pre-coding matrix index of expectation of the terminal under this serving BS and the sub-pre-coding matrix index of leakage of the terminal under cooperative base station that cooperative base station sends, wherein, expect the coding codeword that the corresponding expectation of sub-pre-coding matrix index terminal side makes progress, leak the coding codeword on the corresponding interference radiating way of sub-pre-coding matrix index.
Step S204: serving BS is selected the expectation coding codeword according to the sub-pre-coding matrix index of expectation, and selects to leak sub-pre-encoding codeword according to leaking sub-pre-coding matrix index.
Step S206: serving BS will expect that coding codeword carries out convolution operation with the sub-pre-encoding codeword of leakage and obtains the first pre-encoding codeword.
Step S208: the second pre-encoding codeword that the first precoding after serving BS will be proofreaied and correct transmits and uses as serving BS.
Pass through above-mentioned steps, serving BS is according to channel information, when the structure pre-encoding codeword, pre-encoding codeword is divided into the expectation coding codeword and leaks sub-pre-encoding codeword, and the pre-encoding codeword that obtains proofreaied and correct, making transmits more concentrates on the expectation coding codeword that the desired user terminal side makes progress, and as far as possible little in the interference signal of leaking on the sub-pre-encoding codeword, so that when adopting the CoMP technology, make and reduce the edge customer terminal and disturb accuracy rate to obtain larger raising.
As a more excellent execution mode, step S204 can realize in the following manner: the terminal under the terminal estimation serving BS under the serving BS and the channel matrix between serving BS; According to the terminal under the serving BS and the channel matrix given period shop sign in the form of a streamer pre-encoding codeword between serving BS; Obtain the sub-pre-coding matrix index of expectation according to the sub-pre-encoding codeword of expectation.Certainly carry out above-mentioned steps and obtain to expect that sub-pre-coding matrix index also can obtain serviced base station.When if serving BS and user terminal all need this to expect sub-pre-coding matrix index, can realize by the mode of interactive information.Here obtain to expect sub-pre-coding matrix index and leak sub-pre-coding matrix index by the mode to the channel matrix singular value decomposition, can certainly obtain to expect sub-pre-coding matrix index by other Mathematical treatment and leak sub-pre-coding matrix index, thereby obtain expecting sub-pre-encoding codeword and reveal sub-pre-encoding codeword, can select according to concrete demand.
Equally, step S206 can obtain to leak pre-coding matrix index by similar mode, can comprise the steps: that specifically terminal under the cooperative base station estimates terminal under the cooperative base station and the channel matrix between serving BS; Calculate the sub-pre-encoding codeword of leakage according to the terminal under the cooperative base station and the channel matrix between serving BS; Obtain the sub-pre-coding matrix index of leakage according to leaking sub-pre-encoding codeword.
Mode according to the terminal under the serving BS and the channel matrix given period shop sign in the form of a streamer pre-encoding codeword between serving BS is a lot, introduce the mathematical processing methods of singular value decomposition here, for example, terminal under the serving BS and the channel matrix between serving BS are carried out the singular value decomposition of mathematical theorem, obtain channel estimating code word matrix; Wherein, this channel estimating code word matrix is the part of V matrix, the channel estimating code word in the traversal channel estimating code word matrix, the distance of code word in acquisition channel estimating code word and the code book; Determine that code word schedules to last the shop sign in the form of a streamer pre-encoding codeword apart from the channel estimating code word of minimum.Namely find out the code word the most similar to the channel estimating code word by corresponding with the code word in the codebook set, and with it as the sub-pre-encoding codeword of expectation, mode relatively also can be a lot, for example, can by general Mathematical treatment mode, also can adopt some other artificial treatment mode.
In like manner, when calculating the sub-pre-encoding codeword of leakage, identical processing mode is arranged also, for example, the terminal under the cooperative base station and the channel matrix between serving BS are carried out singular value decomposition, obtain channel estimating code word matrix; Channel estimating code word in the traversal channel estimating code word matrix, the distance of code word in acquisition channel estimating code word and the code book; Determine that code word is the sub-pre-encoding codeword of leakage apart from the channel estimating code word of maximum.
As another more excellent execution mode, serving BS can be proofreaied and correct this first precoding when obtaining the first precoding according to the convolution structure, to improve the accuracy rate of precoding.For example: can use following formula to proofread and correct:
When
Wherein,
Refer to the precoding of current time frequency unit, the state of q sign precoding,
Refer to the precoding of last time frequency unit, N
RBRepresent the Resource Block sum that certain user is used, n
RBResource Block sequence number in the expression resource set, and n
RB=1,2 ... N
RB
As another more excellent execution mode, the first precoding after serving BS will be proofreaied and correct transmits as serving BS after the second pre-encoding codeword that uses, and carries out precoding processing to transmitting according to the second pre-encoding codeword.By such processing, the energy centralization (or perhaps transmitting power is concentrated) that the expectation precoding is upwards transmitted in the desired user terminal side, and the value that transmits on its interference radiating way in the leakage precoding is tried one's best close to zero, make edge customer obtain high as far as possible signal to noise ratio, obtain certain inhibition at interference radiating way.
Need to prove, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing, and, although there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
In another embodiment, also provide a kind of coordinated multipoint transmission precoding processing software, this software be used for to be carried out the technical scheme that above-described embodiment and preferred embodiment are described.
In another embodiment, also provide a kind of storage medium, stored above-mentioned coordinated multipoint transmission precoding processing software in this storage medium, this storage medium includes but not limited to: CD, floppy disk, hard disk, scratch pad memory etc.
The embodiment of the invention also provides a kind of coordinated multipoint transmission precoding processing device, this coordinated multipoint transmission precoding processing device can be used for realizing above-mentioned coordinated multipoint transmission recoding processing method and preferred implementation, carried out explanation, repeat no more, the below describes the module that relates in this coordinated multipoint transmission precoding processing.As used below, the combination of software and/or the hardware of predetermined function can be realized in term " module ".Although the described system and method for following examples is preferably realized with software, hardware, perhaps the realization of the combination of software and hardware also may and be conceived.
Fig. 3 is the structured flowchart according to the coordinated multipoint transmission precoding processing device of the embodiment of the invention, as shown in Figure 3, this device comprises: receiver module 32, selection module 34, convolution operation module 36 and processing module 38, the below is elaborated to said structure.
Receiver module 32, be used for the sub-pre-coding matrix index of expectation of receiving terminal and the sub-pre-coding matrix index of leakage of the terminal under cooperative base station that cooperative base station sends, wherein, expect the coding codeword that the corresponding expectation of sub-pre-coding matrix index terminal side makes progress, leak the coding codeword on the corresponding interference radiating way of sub-pre-coding matrix index; Select module 34, be connected to receiver module 32, the sub-pre-coding matrix index of expectation that is used for receiving according to receiver module 32 is selected the expectation coding codeword and is selected to leak sub-pre-encoding codeword according to leaking sub-pre-coding matrix index; Convolution operation module 36 is connected to and selects module 34, carries out convolution operation for the expectation coding codeword that will select module 34 to obtain with the sub-pre-encoding codeword of leakage and obtains the first pre-encoding codeword; Processing module 38 is connected to convolution operation module 36, and the first pre-encoding codeword that the convolution operation module 36 after being used for proofreading and correct obtains is as the second pre-encoding codeword that transmits and use.
The embodiment of the invention also provides a kind of coordinated multipoint transmission precoding processing system, this coordinated multipoint transmission precoding processing system can be used for realizing above-mentioned coordinated multipoint transmission recoding processing method and preferred implementation, carried out explanation, repeat no more, the below describes the module that relates in this coordinated multipoint transmission precoding processing system.As used below, the combination of software and/or the hardware of predetermined function can be realized in term " module ".Although the described system and method for following examples is preferably realized with software, hardware, perhaps the realization of the combination of software and hardware also may and be conceived.
Fig. 4 is the structured flowchart according to the coordinated multipoint transmission precoding processing system of the embodiment of the invention, as shown in Figure 4, this system comprises serving BS 42, this serving BS can adopt above-mentioned coordinated multipoint transmission precoding processing device 422, this system also comprises the terminal 44 under the serving BS, and the terminal 44 under this serving BS comprises: the first estimation module 442, the first computing modules 444, the first acquisition module 446, the below is described in detail said structure.
The first estimation module 442 is for the channel matrix of channel between the terminal of estimating the estimation module place and serving BS; The first computing module 444 is connected to the first estimation module 442, for the terminal that obtains according to the first estimation module 442 and the channel matrix given period shop sign in the form of a streamer pre-encoding codeword between serving BS; The first acquisition module 446 is connected to the first computing module 444, is used for obtaining the sub-pre-coding matrix index of expectation according to the sub-pre-encoding codeword of expectation that the first computing module 444 obtains.
Fig. 5 is the preferred structured flowchart of coordinated multipoint transmission precoding processing system according to the embodiment of the invention, as shown in Figure 5, this system also comprises: the terminal 52 under cooperative base station corresponding to serving BS, wherein, terminal 52 under cooperative base station corresponding to serving BS comprises: the second estimation module 522, the second computing modules 524 and the second acquisition module 526; The first computing module 444 comprises: the first decomposing module 4442, the first spider module 4444 and the first determination module 4446; The second computing module 524 comprises: the second decomposing module 5242, the second spider module 5244 and the second determination module 5246, the below is described in detail said structure.
The second estimation module 522 is for the terminal under the estimation cooperative base station and the channel matrix between serving BS; The second computing module 524 is connected to the second estimation module 522, and the terminal under this cooperative base station that is used for obtaining according to the second estimation module 522 and the channel matrix between serving BS calculate and leak sub-pre-encoding codeword; The second acquisition module 526 is connected to the second computing module 524, is used for obtaining the sub-pre-coding matrix index of leakage according to the sub-pre-encoding codeword of leakage that the second computing module 524 obtains.
Preferably, this first computing module 444 can comprise: the first decomposing module 4442, be used for the channel matrix between the terminal under this serving BS and this serving BS is carried out singular value decomposition, and obtain channel estimating code word matrix; The first spider module 4444 is connected to the first decomposing module 4442, is used for the channel estimating code word of the channel estimating code word matrix that traversal the first decomposing module 4442 obtains, and obtains the distance of code word in this channel estimating code word and the code book; The first determination module 4446 is connected to the first spider module 4444, be used for to determine that code word that the first spider module 4444 obtains schedules to last the shop sign in the form of a streamer pre-encoding codeword apart from the channel estimating code word of minimum.
Preferably, this second computing module 524 comprises: the second decomposing module 5242, be used for the terminal under this cooperative base station and the channel matrix between serving BS are carried out singular value decomposition, and obtain channel estimating code word matrix; The second spider module 5244 is connected to the second decomposing module 5242, is used for the channel estimating code word of the channel estimating code word matrix that traversal the second decomposing module 5242 obtains, and obtains the distance of code word in this channel estimating code word and the code book; The second determination module 5246 is connected to the second spider module 5244, be used for to determine code word that the second spider module 5244 obtains apart from the channel estimating code word of maximum for leaking sub-pre-encoding codeword.
Describe below in conjunction with preferred embodiment, following preferred embodiment combines above-described embodiment and preferred implementation.
Preferred embodiment one
The object of the present invention is to provide a kind of CoMP precoding implementation method of proofreading and correct based on code word, according to channel information, utilize the correlation between Resource Block, for the precoding that acts on continuous several Resource Block, the mode that employing is proofreaied and correct based on the standard pre-encoding codeword obtains, so that when less feedback data amount, at transmitting terminal pre-coding matrix is recovered (or claiming to substitute single pre-coding matrix with the pre-coding matrix group) to improve systematic function.The below describes the method.
Need to prove, in this preferred embodiment, suppose to have K eNB, a UE is only served in each residential quarter, and the UE of each residential quarter service uses same running time-frequency resource, and each eNB all has the M transmit antennas, k user comprises Nk root reception antenna, and user k need to transmit m
kIndividual independently data flow.Certain eNB
k(k=1,2 ... the signal that K) sends can be expressed as M dimensional vector W
ks
k, wherein, W
kM * m for user k
kThe dimension pre-coding matrix, and satisfy
The computing of tr () expression mark, superscript H represents conjugate transpose computing, s
kThe m of user k
kDimension emission symbolic vector.
For two residential quarter two users, suppose user UE
1For desired user is without loss of generality, then to user UE
1The implementation procedure of precoding be described below:
S1: estimate channel.
To serving BS eNB
1, this community user UE
1Estimate and serving BS eNB
1Between channel matrix H
11And and cooperative base station eNB
2Between channel matrix H
12
To cooperative base station eNB
2, this community user UE
2Estimate and serving BS eNB
2Between channel matrix H
22And and cooperative base station eNB
1Between channel matrix H
21
S2: given period shop sign in the form of a streamer pre-encoding codeword.
(1) at UE
1Side is from the inner code word of choosing of code book (as determining the LTE agreement) of precoding, the code word W in the traversal code book
i(wherein i is the code word sequence number in the corresponding code book).
With channel matrix H
11Carry out singular value decomposition, namely
Obtain channel estimating code word matrix:
Wherein
Be V
11Front m
kRow, H
11UE1 user and this cell base station eNB
1Between N
k* M ties up channel matrix, U
11N
k* M ties up unitary matrice, V
11That M * M ties up unitary matrice, ∈
11=diag (σ
1, σ
2... σ
r), r=rank (H
11), diag represents diagonal matrix, rank represents order computing, σ
1, σ
2... σ
rIt is channel matrix H
11Singular value.
Then travel through the channel estimating code word
With code word W in the code book
iDistance, code word apart from minimum be the expectation sub-pre-encoding codeword estimated value W
11:
Wherein superscript " * " represents adjoint operator, || the value that determinant is got in expression.
Expression is corresponding || and the codeword selection of determinant absolute value minimum schedules to last the estimated value W of shop sign in the form of a streamer pre-encoding codeword
11, corresponding pre-coding matrix index is PMI
11, UE1 is to this cell base station eNB1 feedback PMI
11
Similar, at UE
2Side is with channel matrix H
22Carry out singular value decomposition, obtain channel estimating code word matrix
Further obtain expecting sub-pre-encoding codeword W
22:
Corresponding pre-coding matrix index is PMI
22, UE
2To this cell base station eNB
2Feedback PMI
22
S3 estimates to leak sub-pre-encoding codeword.
At UE
1Side is from the inner code word of choosing of code book (as determining the LTE agreement) of precoding, the code word W in the traversal code book
i(wherein i is the code word sequence number in the corresponding code book) is with channel matrix H
12Carry out singular value decomposition, obtain channel estimating code word matrix
Further calculate the channel estimating code word
With code word W in the code book
iDistance, code word is then leaked sub-pre-encoding codeword W apart from being of maximum
12:
Wherein superscript " * " represents adjoint operator, || the value that determinant is got in expression.
Expression is corresponding || and the codeword selection of determinant absolute value maximum is for revealing the estimated value W of sub-pre-encoding codeword
12, corresponding pre-coding matrix index is WCI
12, UE
1To this cell base station eNB
1Feedback WCI
12
Similar, at UE
2Side is with channel matrix H
21Carry out singular value decomposition, obtain channel estimating code word matrix
Further obtain leaking sub-pre-encoding codeword W
21:
Corresponding pre-coding matrix index is WCI
21, UE
2To this cell base station eNB
2Feedback WCI
21
S4, information interaction.
Serving BS eNB
1With cooperative base station eNB
2By the interface between base station and base station (X2 interface) interactive channel information, i.e. base station eNB
1To base station eNB
2Transmit pre-coding matrix index WCI
12, base station eNB
2To base station eNB
1Transmit pre-coding matrix index WCI
21
S5, the structure pre-encoding codeword.
In base station eNB
1To expect pre-encoding codeword W
11With leakage pre-encoding codeword W
21Carry out convolution, the gained matrix is as pre-encoding codeword.Thereby guarantee desired user signal power maximum, disturb to be suppressed to level off to zero.For residential quarter eNB
1Corresponding this community user UE
1, adjacent cell user UE
2Precoding, namely
In the formula
Expression is to matrix W
11And matrix W
21Ask convolution, and get ranks and W at the matrix of consequence core
11Identical part consists of matrix.
S6 proofreaies and correct pre-encoding codeword.Can adopt following formula to proofread and correct.
Wherein,
Refer to the precoding of current time frequency unit, the state of q sign precoding,
Refer to the precoding of last time frequency unit, N
RBRepresent the Resource Block sum that certain user is used, n
RBResource Block sequence number in the expression resource set, and n
RB=1,2 ... N
RB
Step S7: signal is carried out launching after the precoding.
By this preferred embodiment, when the CoMP of LTE-Advanced system precoding, pre-coding matrix index according to the UE feedback, select the expectation pre-encoding codeword, by the pre-coding matrix index that adjacent cell is come alternately, select to leak pre-encoding codeword, then will expect that the pre-encoding codeword matrix carries out convolution with leakage pre-encoding codeword matrix and obtains precoding, and this precoding proofreaied and correct, can guarantee the desired user signal power maximumly, disturb to be suppressed to level off to zero.
Preferred embodiment two
In the CoMP of this preferred embodiment precoding, when considering that simultaneously the precoding gain of this community user is larger, also take into account adjacent cell with the zero leakage of time-frequency resource user, according to channel information, when the structure pre-encoding codeword, to be expectation pre-encoding codeword and the convolution form of leaking pre-encoding codeword to the precoding processing equivalence that the user transmits, expectation precoding forming energy on the desired user direction converges, leak precoding and then form zero leakage at each interference radiating way, thereby obtain high as far as possible Signal to Interference plus Noise Ratio at the desired user receiving terminal, suppress to disturb at each interference radiating way simultaneously.
In this preferred embodiment, take the situation of two base station cells as example describes, need to prove, CoMP precoding implementation method under two cell scenario that in the preferred embodiment, provide, wherein the number of transmit antennas of eNB1, eNB2 is 4, UE
1, UE
2Reception antenna is 2, and the number of plies of each UE is that 2, Fig. 6 is the flow chart of coordinated multipoint transmission recoding processing method according to the preferred embodiment of the invention, and as shown in Figure 6, this flow process comprises the steps:
Step S602 estimates base station eNB
1With this community user UE
1Between channel matrix H
11, and base station eNB
1With adjacent cell user UE
2Between channel matrix H
21
To cooperation cell eNB
2, estimate cooperation cell eNB
2With this community user UE
2Between channel matrix H
22And cooperation cell eNB
2With adjacent cell user UE
2Between channel matrix H
12
Step S604 estimates the expectation pre-encoding codeword, at UE
1Side is with channel matrix H
11Carry out singular value decomposition, namely
Obtain channel estimating code word matrix:
V wherein
11, [2]Be V
11Front 2 row of matrix, H
11The dimension of 2 * 4 between UE1 user and this cell base station eNB1 channel matrix, U
112 * 4 dimension unitary matrice, V
114 * 4 dimension unitary matrice, ∈
11=diag (σ
1, σ
2), 2=rank (H
11), diag () represents diagonal matrix, the computing of rank () expression order, σ
1, σ
2It is channel matrix H
11Singular value.
Then travel through the channel estimating code word
With the distance of a certain code word in the code book, code word is apart from the estimated value W that is the sub-pre-encoding codeword of expectation of minimum
11:
Wherein superscript " * " represents adjoint operator, || the value that determinant is got in expression.
Expression is corresponding || and the codeword selection of determinant absolute value minimum schedules to last the estimated value W of shop sign in the form of a streamer pre-encoding codeword
11, corresponding pre-coding matrix index is PMI
11, UE1 is to this cell base station eNB1 feedback PMI
11
Similarly, at UE
2Side obtains expecting sub-pre-encoding codeword W
22:
Corresponding pre-coding matrix index is PMI
22, UE
2To this cell base station eNB
2Feedback PMI
22
Step S606 estimates to leak pre-encoding codeword W
12
Estimate to leak pre-encoding codeword, in the UE1 side, from the inner code word of choosing of code book (as determining the LTE agreement) of precoding, the code word W in the traversal code book
i(wherein i is the code word sequence number pre-encoding codeword W in the corresponding code book
12:
Wherein superscript " * " represents adjoint operator, || the value that determinant is got in expression.
Expression is corresponding || and the codeword selection of determinant absolute value maximum is for revealing the estimated value W of sub-pre-encoding codeword
12, corresponding pre-coding matrix index is WCI
12, UE
1To this cell base station eNB
1Feedback WCI
12
Similar, in the UE2 side, obtain leaking sub-pre-encoding codeword W
21:
Corresponding pre-coding matrix index is WCI
21, UE2 is to this cell base station eNB2 feedback WCI
21
Step S608, information interaction, serving BS eNB1 and cooperative base station eNB2 are by X2 mouth interactive channel information, and namely base station eNB 1 is transmitted pre-coding matrix index WCI to base station eNB 2
12, base station eNB 2 is transmitted pre-coding matrix index WCI to base station eNB 1
21
Step S610: the structure pre-encoding codeword, by expectation pre-encoding codeword W
1With leakage pre-encoding codeword W
2Between mapping, obtain the pre-encoding codeword of corresponding this community user UE1 of base station eNB 1, adjacent cell user UE2, namely
In the formula
Expression is to matrix W
11And matrix W
21Ask convolution, and get ranks and W in the matrix of consequence central part
11The part that size is identical consists of matrix.
Step S612: pre-encoding codeword is proofreaied and correct.
In LTE (or LTE-Adv) system, the OFDM symbol cyclic prefix can not be very long, has inevitably certain correlation between the Resource Block, therefore can utilize the correlation between Resource Block to expand feedback information.During realization, the pre-coding matrix that feedback is obtained is as the pre-coding matrix of the Resource Block in the middle of the Resource Block group, and the pre-coding matrix of other Adjacent resource pieces is obtained by interpolation.
That is, the precoding after the correction
Wherein,
Refer to the precoding of current time frequency unit, the state of superscript q sign precoding,
Refer to the precoding of last time frequency unit, N
RBRepresent the Resource Block sum that certain user is used, n
RB(n
RB=1,2 ... N
RB) represent the Resource Block sequence number in the resource set, what obtain after namely proofreading and correct is one group of precoding, the corresponding Resource Block of each precoding in the group.
Step S614: precoding processing, for base station eNB 1, according to estimating that the pre-encoding codeword that obtains carries out precoding processing to the x that transmits, namely
X wherein
NRBBe n among the signal x
RBThe signal that the sequence number Resource Block is corresponding.
For cooperative base station eNB
2, its processing procedure and base station eNB
1Similar, no longer narration here.
Fig. 7 is the schematic diagram based on the CoMP precoding implementation result of code book according to the embodiment of the invention, as shown in Figure 7, and for serving BS eNB
1, energy centralization is to this community user UE after the precoding
1, zero falls into trend adjacent cell user UE
2For cooperative base station eNB
2, energy centralization is to this community user UE after the precoding
2, zero falls into trend adjacent cell user UE
1
A kind of precoding implement device also is provided in this preferred embodiment, has been applied to the LTE-Advanced system.Fig. 8 is the structured flowchart of CoMP pre-coding apparatus according to the preferred embodiment of the invention, as shown in Figure 8, this device comprises: channel estimation module 80, expectation pre-encoding codeword and leakage pre-encoding codeword are estimated and feedback module 82, channel information interactive module 84, precoding constructing module 86, precoding correction module 88 and precoding processing module 88, the below is described in detail said structure.
Channel estimation module 80 is for service cell eNB
1, be used for estimating user UE1 and base station eNB
1Between channel matrix H
11And estimating user UE
1With base station eNB
2Between channel matrix H
12
Equally, to cooperation cell UE
2, be used for estimating user UE
2With base station eNB
2Between channel matrix H
22And estimating user UE2 and base station eNB
1Between channel matrix H
21
Expectation pre-encoding codeword and leak pre-encoding codeword and estimate and feedback module 82 is connected to channel estimation module 80, be used for according to the delivery channel of channel estimation module 80 set up with expectation precoding and leakage precoding between relation.
Channel information interactive module 84 is connected to the expectation pre-encoding codeword and leaks pre-encoding codeword and estimates and feedback module 82, is used for the mutual transmission of channel information.
Precoding constructing module 86 is connected to channel information interactive module 84, is used for generating pre-encoding codeword.
Pre-encoding codeword correction module 88 is connected to precoding constructing module 86, is used for pre-encoding codeword is proofreaied and correct.
Precoding processing module 89 is connected to pre-encoding codeword correction module 88, is used for the CoMP precoding of residential quarter.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, carried out by calculation element thereby they can be stored in the storage device, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. coordinated multipoint transmission recoding processing method is characterized in that comprising:
Serving BS receives the sub-pre-coding matrix index of expectation of the terminal under this serving BS and the sub-pre-coding matrix index of leakage of the terminal under described cooperative base station that cooperative base station sends, wherein, the coding codeword that the described expectation corresponding expectation of sub-pre-coding matrix index terminal side makes progress, the coding codeword on the corresponding interference radiating way of the sub-pre-coding matrix index of described leakage;
Described serving BS is selected the expectation coding codeword according to the sub-pre-coding matrix index of described expectation, and selects to leak sub-pre-encoding codeword according to the sub-pre-coding matrix index of described leakage;
Described serving BS carries out convolution operation with described expectation coding codeword and the sub-pre-encoding codeword of described leakage and obtains the first pre-encoding codeword;
The second pre-encoding codeword that described the first precoding after described serving BS will be proofreaied and correct transmits and uses as described serving BS.
2. method according to claim 1 is characterized in that, receives at serving BS before the sub-pre-coding matrix index of expectation of the terminal under this serving BS, also comprises:
Terminal under the described serving BS is estimated terminal under the described serving BS and the channel matrix between described serving BS;
According to the channel matrix given period shop sign in the form of a streamer pre-encoding codeword between the terminal under the described serving BS and described serving BS;
Obtain the sub-pre-coding matrix index of expectation according to the sub-pre-encoding codeword of described expectation.
3. method according to claim 2 is characterized in that, comprises according to the channel matrix given period shop sign in the form of a streamer pre-encoding codeword between the terminal under the described serving BS and described serving BS:
Channel matrix between the terminal under the described serving BS and described serving BS is carried out singular value decomposition, obtain channel estimating code word matrix;
Travel through the channel estimating code word in the described channel estimating code word matrix, obtain the distance of code word in described channel estimating code word and the code book;
Determine that code word schedules to last the shop sign in the form of a streamer pre-encoding codeword apart from the channel estimating code word of minimum.
4. method according to claim 1 is characterized in that, before the sub-pre-coding matrix index of the leakage in the terminal under the described cooperative base station that receives described cooperative base station transmission, also comprises:
Terminal under the described cooperative base station is estimated terminal under the described cooperative base station and the channel matrix between serving BS;
Calculate the sub-pre-encoding codeword of leakage according to the terminal under the described cooperative base station and the channel matrix between serving BS;
Obtain the sub-pre-coding matrix index of leakage according to the sub-pre-encoding codeword of described leakage.
5. method according to claim 4 is characterized in that, comprises according to the terminal under the described cooperative base station and the sub-pre-encoding codeword of the calculating of the channel matrix between serving BS leakage:
Terminal under the described cooperative base station and the channel matrix between serving BS are carried out singular value decomposition, obtain channel estimating code word matrix;
Travel through the channel estimating code word in the described channel estimating code word matrix, obtain the distance of code word in described channel estimating code word and the code book;
Determine that code word is the sub-pre-encoding codeword of leakage apart from the channel estimating code word of maximum.
6. each described method in 5 according to claim 1 is characterized in that described serving BS uses following formula that described the first precoding is proofreaied and correct:
Wherein,
Be the precoding after proofreading and correct,
Refer to the precoding of current time frequency unit, the state of q sign precoding,
Refer to the precoding of last time frequency unit, N
RBRepresent the Resource Block sum that certain user is used, n
RBResource Block sequence number in the expression resource set, and n
RB=1,2 ... N
RB
7. each described method in 5 according to claim 1, it is characterized in that, described the first precoding after described serving BS will be proofreaied and correct transmits as described serving BS after the second pre-encoding codeword that uses, and carries out precoding processing to transmitting according to described the second pre-encoding codeword.
8. a coordinated multipoint transmission precoding processing device is applied to serving BS, it is characterized in that comprising:
Receiver module, be used for the sub-pre-coding matrix index of expectation of receiving terminal and the sub-pre-coding matrix index of leakage of the terminal under described cooperative base station that cooperative base station sends, wherein, the coding codeword that the described expectation corresponding expectation of sub-pre-coding matrix index terminal side makes progress, the coding codeword on the corresponding interference radiating way of the sub-pre-coding matrix index of described leakage;
Select module, be used for selecting the expectation coding codeword and selecting to leak sub-pre-encoding codeword according to the sub-pre-coding matrix index of described leakage according to the sub-pre-coding matrix index of described expectation;
The convolution operation module is used for that described expectation coding codeword and the sub-pre-encoding codeword of described leakage are carried out convolution operation and obtains the first pre-encoding codeword;
Processing module, described the first pre-encoding codeword after being used for proofreading and correct is as the second pre-encoding codeword that transmits and use.
9. coordinated multipoint transmission precoding processing system, described system comprises serving BS, described serving BS comprises coordinated multipoint transmission precoding processing device according to claim 8, it is characterized in that, described system also comprises: the terminal under the described serving BS, and the terminal under the described serving BS comprises:
The first estimation module is for the channel matrix of channel between the terminal of estimating described estimation module place and described serving BS;
The first computing module is used for according to the channel matrix given period shop sign in the form of a streamer pre-encoding codeword between described terminal and described serving BS;
The first acquisition module is used for obtaining the sub-pre-coding matrix index of expectation according to the sub-pre-encoding codeword of described expectation.
10. system according to claim 9 is characterized in that, described the first computing module comprises:
The first decomposing module is used for the channel matrix between the terminal under the described serving BS and described serving BS is carried out singular value decomposition, obtains channel estimating code word matrix;
The first spider module for the channel estimating code word that travels through described channel estimating code word matrix, obtains the distance of code word in described channel estimating code word and the code book;
The first determination module is used for determining that code word schedules to last the shop sign in the form of a streamer pre-encoding codeword apart from the channel estimating code word of minimum.
11. system according to claim 9 is characterized in that, described system also comprises: the terminal under cooperative base station corresponding to described serving BS, and wherein, the terminal under cooperative base station corresponding to described serving BS comprises:
The second estimation module is used for estimating terminal under the described cooperative base station and the channel matrix between serving BS;
The second computing module is used for calculating the sub-pre-encoding codeword of leakage according to the terminal under the described cooperative base station and the channel matrix between serving BS;
The second acquisition module also is used for obtaining the sub-pre-coding matrix index of leakage according to the sub-pre-encoding codeword of described leakage.
12. system according to claim 11 is characterized in that, described the second computing module comprises:
The second decomposing module is used for the terminal under the described cooperative base station and the channel matrix between serving BS are carried out singular value decomposition, obtains channel estimating code word matrix;
The second spider module for the channel estimating code word that travels through described channel estimating code word matrix, obtains the distance of code word in described channel estimating code word and the code book;
The second determination module is used for determining that code word is the sub-pre-encoding codeword of leakage apart from the channel estimating code word of maximum.
13. system according to claim 9 is characterized in that, described coordinated multipoint transmission precoding processing device also comprises precoding module, and described precoding module is used for carrying out precoding processing to transmitting according to described the second pre-encoding codeword.
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