CN103259582B - A kind of multi-point cooperative transmission method for precoding, terminal and base station - Google Patents
A kind of multi-point cooperative transmission method for precoding, terminal and base station Download PDFInfo
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- CN103259582B CN103259582B CN201210036954.9A CN201210036954A CN103259582B CN 103259582 B CN103259582 B CN 103259582B CN 201210036954 A CN201210036954 A CN 201210036954A CN 103259582 B CN103259582 B CN 103259582B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
Abstract
The present invention provides a kind of precoding implementation method, including：Terminal obtains its channel matrix between serving BS, each cooperative base station；The signal for obtaining the serving BS and each cooperative base station reaches the time delay of the terminal；Corresponding pre-encoding codeword is obtained according to each channel matrix, and, the corresponding pre-coding matrix index of the pre-encoding codeword；Obtain the phasing matrix between the serving BS and each cooperative base station；Give the time delay, pre-coding matrix index and phasing matrix feedback to the serving BS.Time delay, pre-coding matrix index and phasing matrix are sent to cooperative base station by serving BS, and cooperative base station is according to above-mentioned time delay, pre-coding matrix index and phasing matrix to being sent to terminal after signal processing.The present invention also provides a kind of base station and terminals.
Description
Technical field
The present invention relates to wireless communication fields, in particular to a kind of multi-point cooperative transmission (Co-ordinated
Multi-Point Transmission, CoMP) method for precoding, terminal and base station.
Background technology
In 3Gpp long term evolutions (Long Term Evolution-Advanced, LTE-A) system, it is proposed that use
CoMP technologies improve the performance of system.Multi-point cooperative transmission technology is the association between the multiple transmission point detached on geographical location
Make.In general, multiple transmission point is the base station of different community.Wherein, downlink multi-point cooperative transmission technical solution is broadly divided into
Two classes：Combined dispatching and joint send (JointTransmission, JT).Combined dispatching is by the time between cell, frequency
The coordination of rate and space resources distributes mutually orthogonal resource for different terminals (User Equipment, UE), avoids mutually
Between interference.The interference of minizone be restrict cell edge UE performances principal element, therefore combined dispatching can reduce it is small
The interference in section, to improve the performance of cell edge UE.
From combined dispatching only there are one cell it is different to UE transmission datas, joint send then have multiple cells simultaneously to UE hair
Data are sent, signal is received to enhance UE.As shown in Figure 1, two cells are on the same resource to a UE transmission data, UE is same
When receive the signals of multiple cells.On the one hand, the useful signal superposition from multiple cells can promote UE received signal matter
On the other hand amount reduces the interference that UE is subject to, to improve system performance.
In addition, in traditional downlink mimo system, all transmitting antennas are emitted on position at one.And in Fig. 1
Under the antenna scene being spaced in reason, eNB1 (macrocell, Macro Cell) and eNB2 (Microcell, Pico Cell) are when identical
Frequency resource is a user service simultaneously, and transmitting antenna is geographically interval, and these antenna is different relative to UE
Position.Antenna port in identical transmitting position is relevant, it is believed that is to have same large scale shadow fading.And locate
Typically incoherent in the transmit antenna port of different location, this is primarily due to these transmit antenna port distances
Farther out, and the environment of surrounding is rich scattering, and the transmit antenna port in different location shows different big rulers
Spend shadow fading.When the transmitting antenna that these are in different location is combined to a UE transmission data, channel is showed and is passed
The different property of system mimo channel.The design and CSI (channel that this channel for embodying new property just needs some different
State information, channel state information) feedback mechanism.
Therefore, it is necessary to high-precision is found, and the CoMP precoding feedbacks and implementation method of brief and practical.
Invention content
The technical problem to be solved in the present invention is to provide a kind of precoding implementation method, terminal and base stations, overcome different bases
Between standing and the difference of same base station multiple antennas reaches the influences that time delays are brought.
To solve the above-mentioned problems, the present invention provides a kind of precoding implementation methods, including：
Terminal obtains its channel matrix between serving BS, each cooperative base station；
The signal that the terminal obtains the serving BS and each cooperative base station reaches the time delay of the terminal；
The terminal obtains corresponding pre-encoding codeword according to each channel matrix, and, the pre-encoding codeword pair
The pre-coding matrix index answered；
The terminal obtains the phasing matrix between the serving BS and each cooperative base station；
The terminal gives the time delay, pre-coding matrix index and phasing matrix feedback to the serving BS.
Further, the above method can also have the characteristics that, the terminal obtains corresponding prelist according to channel matrix
Code code word include：
The terminal is by channel matrix HiSingular value decomposition is carried out,Extract ViiPreceding mkRow obtain channel
Estimate code word matrixBy in predefined code book with it is describedThe shortest code word of distance as the channel matrix HiIt is corresponding
Pre-encoding codeword；
Wherein, the HiFor the channel matrix between the terminal and the serving BS, alternatively, for the terminal and institute
State the channel matrix between cooperative base station.
Further, the above method can also have the characteristics that, the terminal obtains the serving BS and each cooperates
Phasing matrix between base station includes：
The present invention also provides a kind of precoding implementation methods, including：
The cooperative base station of terminal receives time delay, phasing matrix and pre-coding matrix from the serving BS of the terminal
Index, the time delay reach the time delay of the terminal for the signal of the serving BS and the cooperative base station；The phase school
Phasing matrix of the positive matrices between the serving BS and the cooperative base station, the pre-coding matrix index is described
Terminal feeds back to serving BS pre-coding matrix index corresponding with the cooperative base station；
The signal for being sent to the terminal is carried out following processing by the cooperative base station：Use the phasing matrix
Carry out phasing, carry out time domain delay or frequency domain phase place using the time delay and make it equivalent to time domain to be delayed, using with
The corresponding pre-encoding codeword of the pre-coded index carries out precoding, will treated that signal emits to the terminal.
Further, the above method can also have the characteristics that, described to carry out phasing packet using phasing matrix
It includes：
Wherein, s1It is the signal for being sent to the terminal,The serving BS with it is described
Phasing matrix between cooperative base station.
Further, the above method can also have the characteristics that, described to carry out phase school using the phasing matrix
Just, it carries out frequency domain phase place and the pre-encoding codeword obtained using the pre-coded index progress precoding processing includes：
Wherein, s1It is the signal for being sent to the terminal,It is phasing matrix, W2It is institute
Stating the corresponding pre-encoding codeword of pre-coding matrix index, q is sub-carrier indices or index associated with particular resource unit,
N indicates that the points of inverse-Fourier transform, time delays of the τ between the serving BS and the cooperative base station are counted using delay
It indicates.
The present invention also provides a kind of terminals, including：
Channel estimation module, for obtaining the channel matrix between the terminal and serving BS, each cooperative base station；
Time delay estimation module, the signal for obtaining the serving BS and each cooperative base station reach the terminal when
Prolong；
Pre-encoding codeword constructing module is used to obtain corresponding pre-encoding codeword according to each channel matrix, and, institute
State the corresponding pre-coding matrix index of pre-encoding codeword；
Phasing matrix estimation module, for obtaining the phasing between the serving BS and each cooperative base station
Matrix；
Feedback module, for giving the time delay, pre-coding matrix index and phasing matrix feedback to the service base
It stands.
Further, above-mentioned terminal can also have the characteristics that, the pre-encoding codeword constructing module is according to channel matrix
Obtaining corresponding pre-encoding codeword includes：
By channel matrix HiSingular value decomposition is carried out,Extract ViiPreceding mkRow obtain channel estimation code word
MatrixBy in predefined code book with it is describedThe shortest code word of distance as the channel matrix HiCorresponding precoding
Code word；
Wherein, the HiFor the channel matrix between the terminal and the serving BS, alternatively, for the terminal and institute
State the channel matrix between cooperative base station.
Further, above-mentioned terminal can also have the characteristics that, the terminal obtains the serving BS and each cooperates
Phasing matrix between base station includes：
The present invention also provides a kind of base stations, including：
Information exchange module, in cooperative base station of the base station as terminal, from the serving BS of the terminal
Time delay, phasing matrix and pre-coding matrix index are received, the time delay is the serving BS and the cooperative base station
Signal reach the time delay of the terminal；Phase of the phasing matrix between the serving BS and the cooperative base station
Bit correction matrix, the pre-coding matrix index are that feed back to the serving BS corresponding with the cooperative base station for the terminal
Pre-coding matrix index；
Phasing and coding module, the signal for that will be sent to the terminal carry out following processing：Using described
Phasing matrix carries out phasing, carries out time domain delay using the time delay or frequency domain phase place makes it equivalent to time domain
Delay, outputs signal to the precoding module；
Precoding module, the signal use for being exported to the phasing and precoding module and the precoding rope
Draw after corresponding pre-encoding codeword carries out precoding processing and emits to the terminal.
Further, above-mentioned base station can also have the characteristics that, the phasing and coding module use phasing
Matrix carries out phasing：
Wherein, s1It is the signal for being sent to the terminal,The serving BS with it is described
Phasing matrix between cooperative base station.
Further, above-mentioned base station can also have the characteristics that, the precoding module is to phasing and precoding mould
The signal use pre-encoding codeword corresponding with the pre-coded index of block output emits after carrying out precoding processing to the end
End includes：
Wherein, s1It is the signal for being sent to the terminal,It is phasing matrix, W2It is institute
Stating the corresponding pre-encoding codeword of pre-coding matrix index, q is sub-carrier indices or index associated with particular resource unit,
N indicates that the points of inverse-Fourier transform, time delays of the τ between the serving BS and the cooperative base station are counted using delay
It indicates, s1CDDFor the signal of precoding module output.
The present invention is according to channel information, using cyclic delay diversity (Cyclic Delay Diversity, CDD) mode,
It is compensated with the transmission time delay difference of same base station different antennae between different base station, this method is not changing base station data transmission
On the basis of time does not increase user's receiving terminal complexity, layering phasing precoding is on the one hand used, on the other hand basis
The delay inequality of terminal feedback carries out cyclic shift to realize coherent transmission at base station difference transmitting antenna end to signal；The present invention couple
The transmission time delay difference of minizone is compensated, to improve robustness of the CoMP system to minizone delay inequality.And due to
Identical information is put together by different channels in receiving terminal, and the diversity that user efficiently utilizes channel offer increases
Benefit improves the quality that CoMP user receives signal.
Description of the drawings
Fig. 1 is two cell single user application schematic diagrams of the CoMP precodings the present invention is based on cyclic delay diversity；
Fig. 2 is the flow chart of CoMP precoding implementation method of the embodiment of the present invention based on cyclic delay diversity；
Fig. 3 is that design sketch is realized in CoMP precoding of the embodiment of the present invention based on cyclic delay diversity；
Fig. 4 is terminal block diagram of the embodiment of the present invention；
Fig. 5 is base station of embodiment of the present invention block diagram.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment carry out in detail+explanation.It should be noted that in the absence of conflict, the embodiment in the application and embodiment
In feature mutually can arbitrarily combine.
The embodiment of the present invention provides a kind of precoding implementation method, including：
Terminal obtains its channel matrix between serving BS, each cooperative base station；
The signal that the terminal obtains the serving BS and each cooperative base station reaches the time delay of the terminal；
The terminal obtains corresponding pre-encoding codeword according to each channel matrix, and, the pre-encoding codeword pair
The pre-coding matrix index answered；
The terminal obtains the phasing matrix between the serving BS and each cooperative base station；
The terminal gives the time delay, pre-coding matrix index and phasing matrix feedback to the serving BS.
Wherein, a kind of method that the terminal obtains corresponding pre-encoding codeword according to channel matrix is：
The terminal is by channel matrix HiSingular value decomposition is carried out,Extract ViiPreceding mkRow obtain channel
Estimate code word matrixBy in predefined code book with it is describedThe shortest code word of distance as the channel matrix HiIt is corresponding
Pre-encoding codeword；
Wherein, the HiFor the channel matrix between the terminal and the serving BS, alternatively, for the terminal and institute
State the channel matrix between cooperative base station.
Wherein, the terminal obtains a kind of side of the phasing matrix between the serving BS and each cooperative base station
Method is：
The present invention also provides a kind of precoding implementation methods, including：
Serving BS receive time delay between the serving BS and each cooperative base station of terminal feedback, serving BS with it is each
Phasing matrix between cooperative base station, and, the terminal corresponds to the pre-coding matrix index of each cooperative base station, by institute
It states time delay, phasing matrix and pre-coding matrix index and is sent to corresponding cooperative base station；
Cooperative base station receives time delay, phasing matrix and pre-coding matrix index from the serving BS of the terminal,
The time delay reaches the time delay of the terminal for the signal of the serving BS and the cooperative base station；The phasing matrix
Phasing matrix between the serving BS and the cooperative base station, the pre-coding matrix index are that the terminal is anti-
The serving BS of feeding pre-coding matrix index corresponding with the cooperative base station；
The signal for being sent to the terminal is carried out following processing by the cooperative base station：Use the phasing matrix
Carry out phasing, carry out time domain delay or frequency domain phase place using the time delay and make it equivalent to time domain to be delayed, using with
The corresponding pre-encoding codeword of the pre-coded index carries out precoding, will treated that signal emits to the terminal.
Wherein, described to include using phasing matrix progress phasing：
Wherein, s1It is the signal for being sent to the terminal,The serving BS with it is described
Phasing matrix between cooperative base station.
Wherein, described to carry out phasing using the phasing matrix, it carries out described in frequency domain phase place and use
The pre-encoding codeword that pre-coded index obtains carries out precoding processing：
Wherein, s1It is the signal for being sent to the terminal,It is phasing matrix, W2It is institute
Stating the corresponding pre-encoding codeword of pre-coding matrix index, q is sub-carrier indices or index associated with particular resource unit,
N indicates that the points of inverse-Fourier transform, time delays of the τ between the serving BS and the cooperative base station are counted using delay
It indicates.
The embodiment of the present invention provides a kind of CoMP precodings implementation method, including：
Assuming that there is K eNB, each cell only serves a UE, and the UE of each cell serves uses the same time-frequency
Resource, each eNB all have M root transmitting antennas, and k-th of user includes NkRoot reception antenna, user k need to transmit mkA independence
Data flow.Certain eNBkThe signal that (k=1,2...K) is sent is represented by M dimensional vectors Wksk, wherein WkFor user k M ×
mkPre-coding matrix is tieed up, and meets tr (WkWk H)=mk, tr () expression mark operations, superscript H expression conjugate transposition operations, skIt is
The m of user kkDimension transmitting symbolic vector.
Use JT modes for a user service by two cells, wherein eNB1 is serving BS, and eNB2 is cooperation base
It stands, user UE1 is desired user, then as follows to the realization process description of the precoding of user UE1：
1) estimate channel, to serving BS eNB1, the channel matrix H 1 between user UE1 estimations and serving BS eNB1.It is right
Cooperative base station eNB2, the channel matrix H 2 between user UE1 estimations and cooperative base station eNB2.
2) estimate the time delay between different community
The different channels state information references that same position includes in the signal resource block that user UE1 is sent according to two cells
At the time of pilot tone estimates transmitted by serving cell and cooperation cell data and reaches user respectively, then subtract each other the two to obtain two small
The delay inequality τ in section.τ=t2-t1, wherein t1、t2Respectively serving BS eNB1 and cooperative base station eNB2 signal transmitteds reach
At the time of user UE1.UE1 is to serving BS eNB1 feedback delay τ.
3) pre-encoding codeword is constructed
In the sides UE1, code word, the code word in traversal code book are chosen from the code book of precoding is inner (as determined in LTE protocol)
wiChannel matrix H 1 is carried out singular value decomposition, i.e., by (wherein i is the code word serial number in corresponding code book)It obtains
Channel estimation code word matrix：
WhereinFor V11Preceding mkRow, H1 is the N between UE1 and this cell base station eNB1k× M ties up channel matrix, U11It is
Nk× M ties up unitary matrice, V11It is M × M dimension unitary matrice, ε11=diag (σ1, σ2..., σr), r=rank (H1), diag indicates diagonal
Battle array, rank () indicate order operation, σ1, σ2..., σrIt is the singular value of channel matrix H 1.
Then ergodic channels estimate code word matrixWith code word w in code bookiDistance, distance it is minimum be it is expected that son is pre-
The estimated value W of coding codeword1, it is a kind of calculate distance method be：
Wherein superscript " * " indicates adjoint operator, | | it indicates to take the value of determinant.
Indicate to correspond to | | 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 codeword1, corresponding to prelist
Code matrix index is PMI1, and UE1 feeds back PMI1 to serving BS eNB1.It is of course also possible to which other modes is taken to calculate distance.
It is similar, in the sides UE1, channel matrix H 2 is subjected to singular value decomposition, obtains channel estimation code word matrixInto one
Step obtains it is expected sub- pre-encoding codeword W2：
Corresponding pre-coding matrix index is PMI2, and UE1 feeds back PMI2 to serving BS eNB1.
(4) estimate phasing matrix, in the sides UE1, signal power maximal criterion is based on, according to the channel matrix at the moment
Phasing matrix Θ is calculated with pre-coding matrix：
Wherein superscript " H " indicates that conjugate transposition operator, tr [] expressions ask mark operation.
Indicate that the corresponding maximum Θ of mark is selected as phasing matrix, UE1 feeds back Θ to serving BS eNB1.
(5) (such as X2 connects by the interface between base station and base station by information exchange, serving BS eNB1 and cooperative base station eNB2
Mouthful) interactive channel information, i.e., base station eNB 1 to base station eNB 2 transmit pre-coding matrix index PMI2, minizone time delay number of samples
τ, phasing matrix Θ.
(6) pre-encoding codeword phasing and the CDD coding of cooperative base station
At 2 end of base station eNB, cooperative base station eNB2 after receiving the phasing matrix Θ that serving BS eNB1 is sent,
The phasing matrix is expressed as with signal phase formWherein diag () indicates diagonal
Battle array, θ1, θ2..., θmFor the phase correction factor of the corresponding number of plies.By phase correction factor and pre-coding matrix and number to be sent
It is multiplied according to stream, then the transmitting signal after cooperative base station eNB2 corrections is：
To s after correction1 correctionSymbol carry out cycle delay τ, do delay, τ on every antenna of time domain, be equivalent to frequency domain
Phase place q τ/N on each subcarrier.That is q-th of subcarrier of frequency domain carries out phase-shift processing ej2πqτ/N.Wherein, N indicates anti-Fu
The points of vertical leaf transformation, q are sub-carrier indices (or index associated with particular resource unit).Orthogonal frequency entire in this way
There is no in time for the transmission of multiplexing (OFDM, Orthogonal FrequencyDivision Multiplexing) symbol
Lag has only carried out cyclic shift inside symbol.Above-mentioned s1 correctionIncluded precoding processing, if removing W2, then only indicate
Phasing processing.
Obtaining transmitting signals of the cooperative base station eNB2 after CDD is encoded is：
(7) serving BS eNB1 and cooperative base station eNB2 emits after signal s1 is carried out precoding respectively, then the ends user UE1
Reception signal be：
The specific implementation process of the present invention is described in detail below in conjunction with example.
Embodiment of the method 1
This embodiment offers CoMP precoding implementation methods under two cell scenarios, the transmitting days of wherein eNB1, eNB2
Line number is that the reception antenna number of 4, UE1 is 2, and the number of plies of UE1 is 2, as shown in Fig. 2, including the following steps：
As depicted at step 201, end side carry out channel estimation, estimate serving BS eNB1 and this community user UE1 between
Channel matrix H 1；
To cooperation cell eNB2, the channel matrix H 2 between cooperation cell eNB2 and user UE1 is estimated.
As described in step 202, the time delay between different community is estimated.
The different channels state information references that same position includes in the signal resource block that user UE1 is sent according to two cells
At the time of pilot tone estimates transmitted by serving cell and cooperation cell data and reaches user respectively, then subtract each other the two to obtain two small
The delay inequality τ in section.τ=t2-t1, wherein t1、t2Respectively serving BS eNB1 and cooperative base station eNB2 signal transmitteds reach
At the time of user UE1.UE1 is to serving BS eNB1 feedback delay τ.
As described in step 203, pre-encoding codeword is constructed.
In the sides UE1, code word, the code word in traversal code book are chosen from the code book of precoding is inner (as determined in LTE protocol)
wi(wherein i is the code word serial number in corresponding code book),
Channel matrix H 1 is subjected to singular value decomposition, i.e.,Obtain channel estimation code word matrix：
WhereinFor V11Preceding mkRow, H1 is the N between UE1 and this cell base station eNB1k× M ties up channel matrix, U11It is
Nk× M ties up unitary matrice, V11It is M × M dimension unitary matrice, ε11=diag (σ1, σ2..., σr), r=rank (H1), diag indicates diagonal
Battle array, rank () indicate order operation, σ1, σ2..., σrIt is the singular value of channel matrix H 1.
Then ergodic channels estimate code wordWith code word w in code book1Distance, code word distance it is minimum be it is expected that son is pre-
The estimated value W of coding codeword1：
Wherein superscript " * " indicates adjoint operator, | | it indicates to take the value of determinant.
Indicate to correspond to | | the codeword selection of determinant absolute value minimum schedules to last the estimated value W1 of shop sign in the form of a streamer pre-encoding codeword, corresponding to prelist
Code matrix index is PMI1, and UE1 feeds back PMI1 to serving BS eNB1.
It is similar, in the sides UE1, channel matrix H 2 is subjected to singular value decomposition, obtains channel estimation code word matrixInto one
Step obtains it is expected sub- pre-encoding codeword W2：
Corresponding pre-coding matrix index is PMI2, and UE1 feeds back PMI2 to serving BS eNB1.
As described in step 204, phasing matrix is estimated, in the sides UE1, signal power maximal criterion is based on, when according to this
The channel matrix and pre-coding matrix at quarter calculate phasing matrix Θ：
Wherein superscript " H " indicates that conjugate transposition operator, tr [] expressions ask mark operation.
Indicate that the corresponding maximum Θ of mark is selected as phasing matrix, UE1 feeds back Θ to serving BS eNB1.
As described in step 205, (such as X2 connects by the interface between base station and base station by serving BS eNB1 and cooperative base station eNB2
Mouthful) interactive channel information, i.e., base station eNB 1 to base station eNB 2 transmit pre-coding matrix index PMI2, minizone time delay number of samples
τ, phasing matrix Θ.
As described in step 206, the pre-encoding codeword phasing and CDD of cooperative base station encode
At 2 end of base station eNB, cooperative base station is after the phasing matrix Θ for receiving serving BS transmission, by the phase
Correction matrix is expressed as with signal phase formWherein diag () indicates diagonal matrix, θ1, θ2For correspondence
The phase correction factor of the number of plies.Phasing matrix is multiplied with pre-coding matrix and data flow to be sent, then cooperative base station
ENB2 correction after signal be：
To s after correction1 correctionSymbol carry out cycle delay τ, do delay, τ on every antenna of time domain, be equivalent to frequency domain
Phase place q τ/N on each subcarrier.That is q-th of subcarrier of frequency domain carries out phase-shift processing ej2πqτ/N.Wherein, N indicates anti-Fu
The points of vertical leaf transformation, q are sub-carrier indices (or index associated with particular resource unit).OFDM symbol entire in this way
Transmission lagging in time, only carried out cyclic shift inside symbol.Prolong it is of course also possible to directly carry out time domain
When τ.
Obtaining transmitting signals of the cooperative base station eNB2 after CDD is encoded is：
As described in step 207, serving BS and cooperative base station emit after signal s1 is carried out precoding respectively.
Then the reception signal at the ends user UE1 is：
Fig. 3 is the design sketch that the CoMP precodings according to the ... of the embodiment of the present invention based on code book are implemented, for serving BS
ENB1, energy centralization is to this community user UE1 after precoding；For cooperative base station eNB2, energy centralization is to user after precoding
UE1。
Embodiment of the method 2
This embodiment offers CoMP precoding implementation methods, wherein eNB1, eNB2 ..., eNBk under K cell scenario
Transmitting antenna number be 4, UE1 reception antenna numbers be 2, and the number of plies of each UE is 2, and step is the same as embodiment 1：
Then the reception signal at the ends user UE1 is：
Wherein, the delay inequality τ between serving BS eNB1 and cooperative base station eNB221, τ21=t2-t1, serving BS eNB1 with
Delay inequality τ between cooperative base station eNBkK1, τK1=tK-t1。t1, t2... tKRespectively serving BS eNB1, cooperative base station
ENB2 ..., at the time of cooperative base station eNBk signal transmitteds reach user UE1.θ21, θ22It is corresponded to for cooperative base station eNB2
The phase correction factor of the number of plies, θK1, θK2The phase correction factor of the number of plies is corresponded to for cooperative base station eNBk.
Device embodiment
The embodiment of the present invention provides a kind of terminal, as shown in figure 4, including：Channel estimation module 41, time delay estimation module
42, pre-encoding codeword constructing module 43, phasing matrix estimation module 44 and feedback module 45；Wherein：
Channel estimation module 41, for obtaining the channel matrix between the terminal and serving BS, each cooperative base station；Than
Such as, estimate the channel matrix H 1 between user UE1 and base station eNB 1；Estimate the channel matrix H 2 between user UE1 and base station eNB 2.
Time delay estimation module 42 is connected to channel estimation module 41, for obtaining serving BS and each cooperative base station
Signal reaches the time delay of the terminal；Specifically, according between the output channel calculation different community of channel estimation module 41 when
Prolong difference.
Pre-encoding codeword constructing module 43 is connected to time delay estimation module 42, respective for being obtained according to each channel matrix
Corresponding pre-encoding codeword, and, the corresponding pre-coding matrix index of the pre-encoding codeword；
Phasing matrix estimation module 44, for obtaining the phase school between the serving BS and each cooperative base station
Positive matrices；
Feedback module 45, for giving the time delay, pre-coding matrix index and phasing matrix feedback to the service
Base station.
The embodiment of the present invention also provides a kind of base station, as shown in figure 5, including：Information exchange module 51, phasing and volume
Code module 52 and precoding processing module 53, wherein：
Information exchange module 51 is transmitted for the information between serving BS and cooperative base station；In the base station as terminal
Cooperative base station when, receive time delay, phasing matrix and pre-coding matrix index from the serving BS of the terminal, it is described
Time delay reaches the time delay of the terminal for the signal of the serving BS and the cooperative base station；The phasing matrix is institute
The phasing matrix between serving BS and the cooperative base station is stated, the pre-coding matrix index is that the terminal is fed back to
Serving BS pre-coding matrix index corresponding with the cooperative base station；In serving BS of the base station as terminal
When, it receives time delay, phasing matrix and the pre-coding matrix index that terminal is sent and is sent to corresponding cooperative base station；
Phasing and coding module 52, are connected to information exchange module 51, for carrying out precoding code to cooperative base station
Word phasing and CDD codings；Signal for that will be sent to the terminal carries out following processing：Use the phasing
Matrix carries out phasing, carries out time domain delay using the time delay or frequency domain phase place makes it equivalent to time domain and is delayed, defeated
Go out signal to the precoding module；Specific processing is referring to embodiment of the method；
Precoding processing module 53 is connected to phasing and coding module 52, for carrying out precoding processing.Specifically
, signal use pre-encoding codeword corresponding with the pre-coded index for being exported to phasing and precoding module into
Emit to the terminal after row precoding processing.
The realization function of the modules of apparatus described above is no longer praised herein referring to the specific implementation process of the above method
It states.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer readable storage medium, such as read-only memory, disk or CD
Deng.Optionally, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly
Ground, the form that hardware may be used in each module/unit in above-described embodiment are realized, the shape of software function module can also be used
Formula is realized.The present invention is not limited to the combinations of the hardware and software of any particular form.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
Art personnel, the invention may be variously modified and varied.Any modification made by all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of precoding implementation method, which is characterized in that including：
Terminal obtains its channel matrix between serving BS, each cooperative base station；
The signal that the terminal obtains the serving BS and each cooperative base station reaches the time delay of the terminal；
The terminal obtains corresponding pre-encoding codeword according to each channel matrix, and, the pre-encoding codeword is corresponding
Pre-coding matrix index；
The terminal obtains the phasing matrix between the serving BS and each cooperative base station；
The terminal gives the time delay, pre-coding matrix index and phasing matrix feedback to the serving BS.
2. the method as described in claim 1, which is characterized in that the terminal obtains corresponding precoding code according to channel matrix
Word includes：
The terminal is by channel matrix HiSingular value decomposition is carried out,Extract ViiPreceding m arrange to obtain channel estimation
Code word matrixBy in predefined code book with it is describedThe shortest code word of distance as the channel matrix HiIt is corresponding pre-
Coding codeword；
Wherein, the HiFor the channel matrix between the terminal and the serving BS, alternatively, for the terminal and the association
Make the channel matrix between base station.
3. method as claimed in claim 1 or 2, which is characterized in that the terminal obtains the serving BS and each cooperates
Phasing matrix between base station includes：
Wherein, H1It is the channel matrix between the terminal and the serving BS, W1It is H1Corresponding pre-encoding codeword, HjIt is eventually
Channel matrix between end and cooperative base station, WjIt is HjMark operation is asked in corresponding pre-encoding codeword, tr [] expressions,Indicate the corresponding maximum Θ of mark as the serving BS with it is described
Cooperative base station HjBetween phasing matrix.
4. a kind of precoding implementation method, which is characterized in that including：
The cooperative base station of terminal receives time delay, phasing matrix and pre-coding matrix rope from the serving BS of the terminal
Draw, the time delay reaches the time delay of the terminal for the signal of the serving BS and the cooperative base station；The phasing
Phasing matrix of the matrix between the serving BS and the cooperative base station, the pre-coding matrix index are the end
End feeds back to serving BS pre-coding matrix index corresponding with the cooperative base station；
The signal for being sent to the terminal is carried out following processing by the cooperative base station：It is carried out using the phasing matrix
Phasing carries out time domain delay or frequency domain phase place using the time delay and makes it equivalent to time domain to be delayed, using with it is described
The corresponding pre-encoding codeword of pre-coding matrix index carries out precoding, and by treated, signal emits to the terminal.
5. method as claimed in claim 4, which is characterized in that described to include using phasing matrix progress phasing：
Wherein, s1It is the signal for being sent to the terminal,It is that the serving BS cooperates with described
Phasing matrix between base station.
6. method as described in claim 4 or 5, which is characterized in that described to carry out phase school using the phasing matrix
Just, it carries out frequency domain phase place and carries out precoding processing packet using the pre-encoding codeword that the pre-coding matrix index obtains
It includes：
Wherein, s1It is the signal for being sent to the terminal,It is phasing matrix, W2It is described pre-
Encoder matrix indexes corresponding pre-encoding codeword, and q is sub-carrier indices or index associated with particular resource unit, N tables
Show that the points of inverse-Fourier transform, time delays of the τ between the serving BS and the cooperative base station use delay points table
Show.
7. a kind of terminal, which is characterized in that including：
Channel estimation module, for obtaining the channel matrix between the terminal and serving BS, each cooperative base station；
Time delay estimation module, the signal for obtaining the serving BS and each cooperative base station reach the time delay of the terminal；
Pre-encoding codeword constructing module is used to obtain corresponding pre-encoding codeword according to each channel matrix, and, it is described pre-
The corresponding pre-coding matrix index of coding codeword；
Phasing matrix estimation module, for obtaining the phasing square between the serving BS and each cooperative base station
Battle array；
Feedback module, for giving the time delay, pre-coding matrix index and phasing matrix feedback to the serving BS.
8. terminal as claimed in claim 7, which is characterized in that pre-encoding codeword constructing module is obtained according to channel matrix and corresponded to
Pre-encoding codeword include：
By channel matrix HiSingular value decomposition is carried out,Extract ViiPreceding m arrange to obtain channel estimation code word matrixBy in predefined code book with it is describedThe shortest code word of distance as the channel matrix HiCorresponding precoding code
Word；
Wherein, the HiFor the channel matrix between the terminal and the serving BS, alternatively, for the terminal and the association
Make the channel matrix between base station.
9. terminal as claimed in claim 7 or 8, which is characterized in that the terminal obtains the serving BS and each cooperates
Phasing matrix between base station includes：
Wherein, H1It is the channel matrix between the terminal and the serving BS, W1It is H1Corresponding pre-encoding codeword, HjIt is eventually
Channel matrix between end and cooperative base station, WjIt is HjMark operation is asked in corresponding pre-encoding codeword, tr [] expressions,Indicate the corresponding maximum Θ of mark as the serving BS with it is described
Cooperative base station HjBetween phasing matrix.
10. a kind of base station, which is characterized in that including：
Information exchange module, in cooperative base station of the base station as terminal, from the reception of the serving BS of the terminal
Time delay, phasing matrix and pre-coding matrix index, the time delay are the letter of the serving BS and the cooperative base station
Number reach the time delay of the terminal；Phase school of the phasing matrix between the serving BS and the cooperative base station
Positive matrices, the pre-coding matrix index are that the terminal feeds back to that the serving BS is corresponding with the cooperative base station to prelist
Code matrix index；
Phasing and coding module, the signal for that will be sent to the terminal carry out following processing：Use the phase
Correction matrix carries out phasing, carries out time domain delay using the time delay or frequency domain phase place makes it equivalent to time domain and prolongs
When, output signal to precoding module；
Precoding module, the signal use for being exported to phasing and precoding module and the pre-coding matrix index
Corresponding pre-encoding codeword emits after carrying out precoding processing to the terminal.
11. base station as claimed in claim 10, which is characterized in that the phasing and coding module use phasing square
Battle array carries out phasing：
Wherein, s1It is the signal for being sent to the terminal,It is that the serving BS cooperates with described
Phasing matrix between base station.
12. the base station as described in claim 10 or 11, which is characterized in that the precoding module is to phasing and precoding
Emit after signal use corresponding with the pre-coding matrix index pre-encoding codeword progress precoding processing of module output to
The terminal includes：
Wherein, s1It is the signal for being sent to the terminal,It is phasing matrix, W2It is described pre-
Encoder matrix indexes corresponding pre-encoding codeword, and q is sub-carrier indices or index associated with particular resource unit, N tables
Show that the points of inverse-Fourier transform, time delays of the τ between the serving BS and the cooperative base station use delay points table
Show, s1CDDFor the signal of precoding module output.
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| CN201210036954.9A CN103259582B (en) | 2012-02-17 | 2012-02-17 | A kind of multi-point cooperative transmission method for precoding, terminal and base station |
| PCT/CN2012/087144 WO2013120383A1 (en) | 2012-02-17 | 2012-12-21 | Coordinated multi-point transmission precoding method, terminal, and base station |
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| CN108282206A (en) | 2017-01-06 | 2018-07-13 | 索尼公司 | Electronic device, wireless telecom equipment and wireless communications method |
| CN109600208B (en) * | 2017-09-30 | 2021-06-04 | 电信科学技术研究院 | Uplink transmission and configuration method, terminal and base station |
| CN113727356B (en) * | 2021-08-26 | 2023-11-21 | 中国联合网络通信集团有限公司 | Method and device for reducing communication interference |
| CN116318292A (en) * | 2021-12-20 | 2023-06-23 | 华为技术有限公司 | Method and device for reporting channel information |
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| WO2010130101A1 (en) * | 2009-05-15 | 2010-11-18 | 华为技术有限公司 | Method, device and system for channel pre-coding |
| CN101917381B (en) * | 2010-08-20 | 2013-06-12 | 西安电子科技大学 | Method for compensating delay difference among cells in cooperative multi-point transmission system |
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| CoMP传输方案及反馈技术研究;张必达;《西安电子科技大学硕士学位论文》;20111231;第1、10-11、44-46页 * |
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