CN102891739B - A kind of multipoint cooperative precoding implementation method and device based on code book - Google Patents
A kind of multipoint cooperative precoding implementation method and device based on code book Download PDFInfo
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Abstract
The invention discloses a kind of multipoint cooperative precoding implementation method based on code book and device, applied to wireless communication system, methods described includes：This community user of serving BS and this community user of cooperative base station carry out channel estimation respectively；According to channel estimation results, the sub- sub- pre-encoding codeword of pre-encoding codeword/leakage is expected in this community user estimation of serving BS/cooperative base station, feeds back corresponding pre-coding matrix index；Serving BS and cooperative base station interactive channel information, including reveal the corresponding pre-coding matrix index of sub- pre-encoding codeword；The pre-coding matrix index construction pre-encoding codeword that the interaction of pre-coding matrix index and cooperative base station that serving BS feeds back according to this community user comes；The pre-encoding codeword that serving BS is obtained according to estimation carries out precoding processing to transmission signal.Using the precoding implementation of the present invention, Signal to Interference plus Noise Ratio as high as possible can be obtained expecting user's receiving terminal, while suppressing interference on each interference radiating way.
Description
Technical field
The present invention relates to wireless communication field, more particularly to a kind of multipoint cooperative precoding implementation method based on code book and
Device.
Background technology
In 3Gpp Long Term Evolutions (Long Term Evolution-Advanced, LTE-A) system, coordinated multipoint transmission
(Coordinated Multiple Point, CoMP) technology as one solution inter-cell interference, with improve cell edge and
The technology of cell spectrum efficiency, more in-depth study is had been carried out in LTE R10, but due to time relationship, many technologies
Design be simplified.Finally in addition to the design of compatible CoMP channel condition information pilot tone continues to study in R10, remaining skill
Art is all pulled in R11 and later version and studied.
By the interaction of mobile subscriber's channel information between adjacent base station, adjacent base station takes certain do to being disturbed user
Disturb avoidance strategy or multiple base stations and joint transmission is carried out to mobile subscriber, mainly for Cell Edge User.The purpose is to subtract
The interference of small edge customer, improves the handling capacity and spectrum utilization efficiency of cell-edge data.CoMP application schematic diagrams such as Fig. 1
Shown, there are serving BS, cooperative base station in base station.Wherein, H11Represent service cell eNB1To this community user UE1Channel, H12
Represent service cell eNB1To adjacent cell user UE2Channel.Equally, H22Represent cooperation cell eNB2To this community user UE2's
Channel, H21Represent cooperation cell eNB2To 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, PMI), UE also feeds back to prelist to the worst of adjacent cell channel
Code index (Worst Companion Indicator, WCI).
At patent CN200910273408.5 (a kind of inter-cell interference restraint method based on channel F norm projection scheduling)
In there is provided a kind of inter-cell interference restraint method based on channel F norm projection scheduling, in the field of multiple cell multiuser MIMO
Under scape, multiple base stations are worked by the central controller coordinates on upper strata, are dispatched channel F norm projection user and block pair by CoMP
Angle precoding interference mitigation technology combines, another on the one hand using channel F norm projection user scheduling lifting system capacity
Aspect makees precoding processing using multiple cell block diagonalization, and interference is reached on the basis of the availability of frequency spectrum of cell edge is improved
The purpose of suppression.But this method complexity is higher, it is difficult to realize.
In patent CN201010172626.2 (a kind of method, system and mobile terminal for realizing coordinated multipoint transmission),
There is provided a kind of method for realizing CoMP, the transmission of adjacent cell evolved base station provides the descending of the beam shaping matrix of itself use
Precoding reference signal；The beam shaping matrix that mobile terminal is used according to adjacent cell base station, obtains optimal pre-coding matrix rope
Draw；Terminal obtains the channel quality identification (CQI) of spatial domain Inter-Cell Interference Coordination, and by obtained optimal PMI and CQI feedback to
Base station in service sector；The CQI value of base station in service sector reference terminal spatial domain Inter-Cell Interference Coordination is scheduled, using optimal
PMI sends signal Jing Guo optimal precoding to it, the CoMP of terminal spatial domain Inter-Cell Interference Coordination can be realized,
The code book optimizing mode that this method is used is cumbersome.
Therefore, it is necessary to high accuracy is found, and the CoMP precoding implementation methods of brief and practical.
The content of the invention
It is an object of the invention to provide a kind of CoMP precodings implementation method based on code book and device, improve and expect to use
The Signal to Interference plus Noise Ratio that family receiving terminal is obtained, while suppressing the interference on each interference radiating way, reduces implementation complexity.
The purpose of the present invention is achieved through the following technical solutions.
A kind of multipoint cooperative precoding implementation method based on code book, applied to wireless communication system, comprises the following steps：
This community user of serving BS and this community user of cooperative base station carry out channel estimation respectively；
According to the channel estimation results, sub- precoding code is expected in this community user estimation of serving BS/cooperative base station
Word, corresponding pre-coding matrix index is fed back to serving BS/cooperative base station；And estimate to reveal sub- pre-encoding codeword, to service
Base station/cooperative base station feeds back corresponding pre-coding matrix index；
Serving BS and cooperative base station interactive channel information, leakage that the channel information includes this community user feedback are pre-
The corresponding pre-coding matrix index of coding codeword；
Pre-coding matrix index and cooperative base station that serving BS feeds back according to this community user interact come precoding square
Battle array index construction pre-encoding codeword；
The pre-encoding codeword that serving BS is obtained according to estimation carries out precoding processing to transmission signal.
Preferably, the process of the channel estimation includes：
In serving BS side, the estimation of this community user is the channel matrix H between the serving BS and between cooperative base station
Channel matrix H；
In cooperative base station side, the estimation of this community user is the channel matrix H between the cooperative base station and between serving BS
Channel matrix H.
Preferably, this community user estimation of the serving BS/cooperative base station expects that the method for sub- pre-encoding codeword is：
In serving BS side, this community user, which is first calculated, accurately expects sub- pre-encoding codeword, then from precoding
The code word w in code word, traversal code book is chosen in code booki, respectively accurately to expect sub- pre-encoding codewordEach row with prelisting
The each row of pre-encoding codeword of the corresponding ranks number of code code book do inner product, and inner product modulus value maximum is to expect sub- pre-encoding codeword
W；Similarly, in cooperative base station side, the shop sign in the form of a streamer pre-encoding codeword W that expires is calculated.
Preferably, in serving BS side, this community user basisCalculate and accurately expect sub- precoding code
WordThe μ is normalization factor, and I is unit battle array, and H is the channel matrix between this community user and serving BS.
Preferably, the method for the sub- pre-encoding codeword of this community user estimation leakage of the serving BS/cooperative base station is：
In serving BS side, this community user, which is first calculated, accurately reveals sub- pre-encoding codeword, then from precoding
The code word w in code word, traversal code book is chosen in code booki, respectively accurately to leak each row and the precoding of sub- pre-encoding codeword
The each row of pre-encoding codeword of the corresponding ranks number of code book do inner product, and inner product modulus value minimum is to leak sub- pre-encoding codeword；
Similarly, in cooperative base station side, calculating obtains revealing sub- pre-encoding codeword.
Preferably, in serving BS side, this community user basisCalculate and accurately reveal sub- pre-encoding codewordThe H is the channel matrix between this community user and serving BS of cooperative base station.
Preferably, the method for the serving BS construction pre-encoding codeword is：
Sub- pre-encoding codeword is expected in the pre-coding matrix index selection that serving BS feeds back according to this community user accordingly,
According to cooperative base station interaction come pre-coding matrix index selection reveal sub- pre-encoding codeword accordingly, then leakage is prelisted
Code code word is mapped in the plane for expecting pre-encoding codeword, regard map vector now as pre-encoding codeword.
Device is realized in a kind of multipoint cooperative precoding based on code book, including：
Channel estimation module, located at each end side, for estimating current community user and the serving BS for its service
Between channel matrix and the channel matrix between cooperative base station；
Pre-encoding codeword estimates feedback module, located at each end side, is connected with channel estimation module, for being estimated according to channel
The output estimation for counting module expects sub- pre-encoding codeword and reveals sub- pre-encoding codeword, and feeds back corresponding pre- to its serving BS
Encoder matrix is indexed；
Channel information interactive module, located at base station side, for realizing interactive channel information between current base station and other base stations,
The channel information includes the corresponding pre-coding matrix index of the sub- pre-encoding codeword of leakage；
Pre-encoding codeword constructing module, located at base station side, for the precoding fed back according to the community user of current base station
Matrix index and current base station interact the pre-coding matrix index generation pre-encoding codeword come with cooperative base station；
Precoding processing module, located at base station side, is connected, for prelisting according to generation with construction pre-encoding codeword module
Code code word carries out precoding processing to transmission signal.
Preferably, the pre-encoding codeword estimation feedback module includes expecting sub- pre-encoding codeword estimation feedback unit and let out
Reveal sub- pre-encoding codeword estimation feedback unit, be respectively used to expect sub- pre-encoding codeword and leakage according to the channel matrices estimation
Sub- pre-encoding codeword simultaneously feeds back corresponding pre-coding matrix index to serving BS.
Compared with prior art, the embodiment of the present invention has the advantages that：
By the present invention, when LTE-Advanced systems carry out CoMP precodings, serving BS can be used according to this cell
Sub- pre-encoding codeword is expected in the pre-coding matrix index selection of family feedback, and the pre-coding matrix index come is interacted by adjacent cell and is selected
The sub- pre-encoding codeword of leakage is selected, sub- pre-encoding codeword DUAL PROBLEMS OF VECTOR MAPPING is then will leak out and expires the plane of shop sign in the form of a streamer pre-encoding codeword
On, and the pre-encoding codeword to user's transmission signal is so equivalent to 2 by map vector now as pre-encoding codeword
The form of sub- precoding, a sub- precoding is upwardly formed energy accumulating in expectation user side, and another sub- precoding then exists
Each disturber is upwardly formed null, so that Signal to Interference plus Noise Ratio as high as possible is obtained in expectation user's receiving terminal, while each dry
Disturb and suppress interference on direction, and implementation method is simply easily achieved.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is two cell two users' application schematic diagrams of the CoMP precodings of the invention based on code book；
Fig. 2 is the flow chart of the CoMP precoding implementation methods of the invention based on code book；
Design sketch is realized in the CoMP precodings based on code book that Fig. 3 is the present invention；
Fig. 4 is that the structured flowchart of device is realized in the CoMP precodings based on code book of the present invention.
Embodiment
The present invention is in CoMP precodings, while while considering that the pre-coding gain of this community user is larger, also taking into account
Adjacent cell,, will be to user's transmission signal when constructing pre-encoding codeword according to channel information with the zero leakage of time-frequency resource user
Precoding processing be equivalent to expect pre-encoding codeword with leak pre-encoding codeword projected forms, expect precoding expect use
Family side is upwardly formed energy centralization, and leaks precoding and be then upwardly formed zero leakage in each disturber, so as to expect user
Receiving terminal obtains Signal to Interference plus Noise Ratio as high as possible, while suppressing interference on each interference radiating way.
In order that technical problems, technical solutions and advantages to be solved are clearer, clear, tie below
Drawings and examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
Embodiment of the method
This embodiment offers CoMP precoding implementation methods, wherein eNB under two cell scenarios1、eNB2Transmitting antenna
Number is 4, UE1、UE2Reception antenna is 2, and each UE number of plies is 2, as shown in Fig. 2 comprising the following steps：
As depicted at step 201, base station eNB is estimated1With this community user UE1Between channel matrixAnd base station eNB1With adjacent cell user UE2Between channel matrix
To cooperation cell eNB2For, estimate cooperation cell eNB2With this community user UE2Between channel matrix H22And cooperation
Cell eNB2With adjacent cell user UE1Between channel matrix H21。
As described in step 202, pre-encoding codeword is expected in estimation, in UE1Side, according toμ=1 might as well be set,
Assuming that the order of channel is 2, then it can rememberAbove formula can be written as：
(1) formula of solution is obtained:
So as to accurately be expected sub- pre-encoding codeword
Further, the code word w in code word, traversal code book is chosen in the code book of precodingi(during wherein i is corresponding code book
Code word number), respectively accurately to expect sub- pre-encoding codewordEach row ranks numbers corresponding with precoding codebook prelist
The each row of code code word do inner product, and inner product modulus value maximum is to expect sub- pre-encoding codeword W11：
Inner product operator is sought in wherein dot () expressions, | | modulus operator is represented,Represent to choose the inner product in i code word
Modulus value the maximum, the maximum codeword selection of correspondence inner product schedules to last shop sign in the form of a streamer pre-encoding codeword W11, now pre-encoding codeword index be
PMI11,UE1To this cell base station eNB1Feed back PMI11。
It is similar, in UE2Side, obtains expecting sub- pre-encoding codeword W22：
Corresponding pre-encoding codeword index is PMI22, to this cell base station eNB2Feed back PMI22。
As described in step 203, estimation leakage pre-encoding codeword W12。
Estimation leakage pre-encoding codeword, in UE1Side, according toAssuming that the order of channel is 2, then it can rememberAbove formula can be written as：
(2) formula of solution is obtained:
Solution is accurately leaked sub- pre-encoding codeword
The code word w in code word, traversal code book is chosen in the code book of precodingi(wherein i is the code word in corresponding code book
Number), respectively accurately to leak sub- pre-encoding codewordEach row ranks number corresponding with precoding codebook precoding code
The each row of word do inner product, and inner product modulus value minimum is to leak sub- pre-encoding codeword：
WhereinRepresent to choose the inner product modulus value reckling in i code word, the minimum codeword selection of correspondence inner product is to let out
Flaw pre-encoding codeword W12, pre-encoding codeword index now is WCI12, to this cell base station eNB1Feed back WCI12。
It is similar, in UE2Side, according toSolve the formula and accurately leaked sub- pre-encoding codewordObtain
Leak sub- pre-encoding codeword W21：
Corresponding pre-coding matrix index is WCI21, UE2To this cell base station eNB2Feed back WCI21。
As described in step 204, information exchange, serving BS eNB1With cooperative base station eNB2By X2 mouthfuls of interactive channel information,
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。
As described in step 205, pre-encoding codeword is constructed, by expecting pre-encoding codeword W11With leakage pre-encoding codeword W21
Between mapping, obtain base station eNB1This community user of correspondence UE1, adjacent cell user UE2Pre-encoding codeword, i.e. W1=W21-- reflect
Penetrate -->W11。
Assuming that expecting pre-encoding codeword W11=[SV1 SV2], and leakage pre-encoding codeword W21=[IV1 IV2], then it is final
Precoding is：W1=[SIV1 SIV2], wherein,
As described in step 206, precoding processing, for base station eNB1, the pre-encoding codeword W obtained according to estimation1To transmitting
Signal x carries out precoding processing, i.e. W1·x。
For cooperative base station eNB2, its processing procedure and base station eNB1It is similar, it is not further described.
Fig. 3 is the design sketch that the CoMP precodings according to embodiments of the present invention based on code book are implemented, for serving BS
eNB1, energy centralization forms UE to this community user after precoding1, null trend adjacent cell user UE2；For cooperative base station
eNB2, energy centralization forms UE to this community user after precoding2, null trend adjacent cell user UE1。
Device embodiment
Embodiments in accordance with the present invention realize device there is provided a kind of precoding, applied to LTE-Advanced systems.Figure
4 be the structured flowchart of CoMP precodings according to embodiments of the present invention, and the device includes：End side channel estimation module 41, phase
Hope pre-encoding codeword estimation and feedback module and the estimation of leakage pre-encoding codeword and feedback module 42, channel information interactive module 43
With precoding processing module 44, said structure is described in detail below.
Channel estimation module 41, located at end side, for serving cell, for estimating user UE1With base station eNB1Between letter
Road matrix H11, and estimation user UE1With base station eNB2Between channel matrix H21；Equally, for cooperation cell, for estimating to use
Family UE2With base station eNB2Between channel matrix H22, and estimation user UE2With base station eNB1Between channel matrix H12。
Pre-encoding codeword estimates feedback module 42, including expects pre-encoding codeword estimation and feedback unit and leakage precoding
Code word estimation and feedback unit, located at end side, are connected to channel estimation module 41, for according to the defeated of channel estimation module 41
Go out channel to set up with expecting precoding and leaking the relation for the intersymbol that prelists.
Channel information interactive module 43, located at base station side, the interaction transmission for channel information.
Pre-encoding codeword module 44 is constructed, channel information interactive module 43 is connected to, for generating pre-encoding codeword.
Precoding processing module 45, is connected to construction pre-encoding codeword module 44, for the CoMP precodings in cell.
The modules of apparatus described above realize implement process of the function referring to the above method, no longer praise herein
State.
A preferred embodiment of the present invention has shown and described in described above, but as previously described, it should be understood that the present invention
Be not limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and available for various other combinations,
Modification and environment, and above-mentioned teaching or the technology or knowledge of association area can be passed through in invention contemplated scope described herein
It is modified., then all should be in this hair and the change and change that those skilled in the art are carried out do not depart from the spirit and scope of the present invention
In the protection domain of bright appended claims.
Claims (8)
1. a kind of multipoint cooperative precoding implementation method based on code book, applied to wireless communication system, it is characterised in that the party
Method comprises the following steps：
This community user of serving BS and this community user of cooperative base station carry out channel estimation respectively；
According to the channel estimation results, sub- pre-encoding codeword is expected in this community user estimation of serving BS/cooperative base station, to
Serving BS/cooperative base station feeds back corresponding pre-coding matrix index；And estimate to reveal sub- pre-encoding codeword, to serving BS/
Cooperative base station feeds back corresponding pre-coding matrix index；
Serving BS and cooperative base station interactive channel information, the channel information include the sub- precoding of leakage that this community user feeds back
The corresponding pre-coding matrix index of code word；
Pre-coding matrix index and cooperative base station that serving BS feeds back according to this community user interact come pre-coding matrix rope
Draw construction pre-encoding codeword；
The pre-encoding codeword that serving BS is obtained according to estimation carries out precoding processing to transmission signal；
Wherein, this community user estimation of the serving BS/cooperative base station expects that the method for sub- pre-encoding codeword is：In service
Base station side, this community user, which is first calculated, accurately expects sub- pre-encoding codeword, then chooses code word in the code book of precoding,
Travel through the code word w in code booki, respectively accurately to expect sub- pre-encoding codewordEach row and precoding codebook corresponding ranks
The each row of several pre-encoding codewords do inner product, and inner product modulus value maximum is to expect sub- pre-encoding codeword；Similarly, in cooperative base station
Side, calculates the shop sign in the form of a streamer pre-encoding codeword that expires.
2. multipoint cooperative precoding implementation method as claimed in claim 1, it is characterised in that the process bag of the channel estimation
Include：
Channel matrix between serving BS side, the estimation of this community user and the serving BS and the channel square between cooperative base station
Battle array；
Channel matrix between cooperative base station side, the estimation of this community user and the cooperative base station and the channel square between serving BS
Battle array.
3. multipoint cooperative precoding implementation method as claimed in claim 1, it is characterised in that in serving BS side, this cell
User according toCalculate and accurately expect sub- pre-encoding codewordThe μ is normalization factor, and I is unit battle array, H
For the channel matrix between this community user and serving BS.
4. multipoint cooperative precoding implementation method as claimed in claim 1, it is characterised in that the serving BS/cooperation base
This community user stood estimates that the method for the sub- pre-encoding codeword of leakage is：
In serving BS side, this community user, which is first calculated, accurately reveals sub- pre-encoding codeword, then from the code book of precoding
In choose code word, the code word w in traversal code booki, respectively accurately to leak each row and precoding codebook of sub- pre-encoding codeword
The each row of pre-encoding codeword of corresponding ranks number do inner product, inner product modulus value it is minimum be to leak sub- pre-encoding codeword；Similarly,
In cooperative base station side, calculating obtains revealing sub- pre-encoding codeword.
5. multipoint cooperative precoding implementation method as claimed in claim 4, it is characterised in that in serving BS side, this cell
User according toCalculate and accurately reveal sub- pre-encoding codewordThe H is this community user and clothes of cooperative base station
Channel matrix between business base station.
6. the multipoint cooperative precoding implementation method as described in claim 1 to 5 is any, it is characterised in that the serving BS
Construction pre-encoding codeword method be：
Sub- pre-encoding codeword is expected in the pre-coding matrix index selection that serving BS feeds back according to this community user accordingly, according to
Sub- pre-encoding codeword is revealed in the pre-coding matrix index selection that cooperative base station interaction comes accordingly, then by the sub- precoding code of the leakage
Word is mapped in the plane for expecting pre-encoding codeword, regard map vector now as pre-encoding codeword.
7. device is realized in a kind of multipoint cooperative precoding based on code book, applied to wireless communication system, it is characterised in that the dress
Put including：
Channel estimation module, located at each end side, for estimating between current community user and the serving BS for being its service
Channel matrix and the channel matrix between cooperative base station；
Pre-encoding codeword estimates feedback module, located at each end side, is connected with channel estimation module, for according to channel estimation mould
The output estimation of block expects sub- pre-encoding codeword and reveals sub- pre-encoding codeword, and feeds back corresponding precoding to its serving BS
Matrix index；
Channel information interactive module, located at base station side, for realizing interactive channel information between current base station and other base stations, the letter
Road information includes the corresponding pre-coding matrix index of the sub- pre-encoding codeword of leakage；
Pre-encoding codeword constructing module, located at base station side, for the pre-coding matrix fed back according to the community user of current base station
Index and current base station interact the pre-coding matrix index generation pre-encoding codeword come with cooperative base station；
Precoding processing module, located at base station side, is connected with construction pre-encoding codeword module, for the precoding code according to generation
Word carries out precoding processing to transmission signal；
Wherein, the pre-encoding codeword estimation feedback module, which is additionally operable to first calculate, accurately expects sub- pre-encoding codeword, then
The code word w in code word, traversal code book is chosen in the code book of precodingi, respectively accurately to expect sub- pre-encoding codewordIt is every
The each row of pre-encoding codeword of one row ranks number corresponding with precoding codebook do inner product, maximum as expectation of inner product modulus value
Pre-encoding codeword W.
8. device is realized in multipoint cooperative precoding as claimed in claim 7, it is characterised in that the pre-encoding codeword estimation is anti-
Presenting module includes expecting sub- pre-encoding codeword estimation feedback unit and reveals sub- pre-encoding codeword estimation feedback unit, is respectively used to
Sub- pre-encoding codeword is expected according to the channel matrices estimation and reveals sub- pre-encoding codeword and feeds back corresponding pre-coding matrix
It is indexed to serving BS.
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| CN107370559B (en) * | 2016-05-13 | 2022-04-29 | 中兴通讯股份有限公司 | Feedback method and device of channel state information |
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| CN102025464A (en) * | 2010-12-21 | 2011-04-20 | 中兴通讯股份有限公司 | Method and system for precoding coordination of downlink multi-base station multi-input and multi-output |
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