CN104348590B - Method, terminal and the base station for obtaining precoding of feeding back channel state information - Google Patents

Method, terminal and the base station for obtaining precoding of feeding back channel state information Download PDF

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CN104348590B
CN104348590B CN201310317816.2A CN201310317816A CN104348590B CN 104348590 B CN104348590 B CN 104348590B CN 201310317816 A CN201310317816 A CN 201310317816A CN 104348590 B CN104348590 B CN 104348590B
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code book
matrix
code word
index
code
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CN104348590A (en
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肖华华
徐俊
陈宪明
鲁照华
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Abstract

The invention discloses a kind of method of feeding back channel state information, the terminal of feeding back channel state information and the base stations for obtaining channel state information, this method comprises: the channel state information includes codebook index information, scale parameter when user equipment (UE) is to base station feedback channel state information；The codebook index information includes: first kind code book index I and/or the second class code book index J；The scale parameter includes: the first scale parameter α and/or the second scale parameter β.The feedback unit of terminal is used for base station feedback channel state information, and the channel state information includes codebook index information, scale parameter；Wherein, the codebook index information includes: first kind code book index I and/or the second class code book index J；The scale parameter includes: the first scale parameter α and/or the second scale parameter β.Using the present invention, the accuracy of feedback information was not only promoted, but also feedback overhead can be saved.

Description

Method, terminal and the base station for obtaining precoding of feeding back channel state information
Technical field
The present invention relates to the technology for information acquisition of digital communicating field more particularly to a kind of sides of feeding back channel state information Method, the terminal of feeding back channel state information and the base station for obtaining channel state information.
Background technique
In long evolving system (LTE, Long Term Evolution), agreement is Release8 version, abbreviation R8 Version reflects form there are three types of the information (CSI, Channel State Information) of down physical channel state: channel Quality indicates (CQI, Channels quality indication), pre-coding matrix instruction (PMI, Pre-coding Matrix Indicator), order instruction (RI, Rank Indicator).
CQI is an index for measuring down channel quality quality.In 36-213 agreement CQI with 0~15 integer value It indicates, respectively represented different CQI grades, different CQI correspond to respective modulation system and encoder bit rate (MCS), altogether Divide 16 kinds of situations, can be indicated using 4 bit informations.
PMI refers to only under this emission mode of Closed-Loop Spatial Multiplexing, user equipment (UE, User Equipment) basis The channel quality measured tells enhanced base station (eNB, eNode B) should be using which type of pre-coding matrix come to issuing the UE Physical Downlink Shared Channel (PDSCH, Physical Downlink Shared Channel) channel carry out precoding.PMI Feedback granularity can be whole bandwidth feed back a PMI, PMI can also be fed back according to subband (subband).
RI is used to describe the number of space independent channel, the order of respective channels response matrix.In Open-Loop Spatial Multiplexing and close Under annular space multiplexer mode, UE is needed to feed back RI information, feedback RI information is not needed under other modes.The sum of ranks layer of channel matrix Number correspond to, therefore UE to base station feedback RI information be feeding back downlink transmit the number of plies.
Transport layer is the concept of multiple antennas " layer " in LTE and LTE-A, of effective independent channel in representation space multiplexing Number corresponds in version 10 with antenna port, and wherein antenna port is logic port in version 10, and the sum of transport layer is just It is RI.In addition, layer is corresponding with " MIMO stream " concept in IEEE802.16m, physical meaning having the same.
In LTE system, the feedback of CQI, PMI, RI can be periodic feedback, be also possible to acyclic feedback. CQI and PMI can send simultaneously or CQI, PMI and RI while send.Wherein, for periodic feedback, if UE is not required to Data are sent, then the CSI of periodic feedback physically row control channel (PUCCH, Physical Uplink Control Channel with format 2 or 2a or 2b(PUCCH format2/2a/2b on)) transmission, if UE needs to send data, CSI Physically transmission in row shared channel (PUSCH, Physical Uplink Shared Channel)；It is anti-for aperiodicity For feedback, only transmitted on PUSCH.
Advanced long-term evolution system (LTE-A, Long the Term Evolution of evolution standard as LTE Advanced bigger system bandwidth (reaching as high as 100MHz)) is needed support, and needs to improve average spectral efficiency (ase) and small The spectrum efficiency of area edge user, agreement are Release10 version, abbreviation R10 version, for this purpose, lte-a system introduces very More new technologies: (1) the high-order multiple-input and multiple-output (MIMO, Multiple Input Multiple Output) of downlink, LTE system System downlink could support up 4 antenna transmissions, and the introducing of high-order mimo is so that lte-a system downlink could support up the transmission of 8 antennas, Then the dimension of channel state matrix increases；(2) cooperative multipoint transmission (CoMP, Coordinated multiple point Transmission), which is exactly the cooperation transmission using multiple cell transmission antennas, then UE may need to feed back it is multiple The channel state information of cell.
More antennas are used in transmitting terminal, that is, eNB, the mode of spatial reuse can be taken to improve transmission rate, that is, sent out Different antennae position on the identical running time-frequency resource of sending end emits different data, also uses more antennas in receiving end, that is, UE, The resource of all antennas can be distributed on same user in the case where single user, it is more that this transmission form is called single user Input multi output (SU-MIMO), in addition also can in the case where multi-user by the resource allocation of different antennae to different user, this Kind transmission form is called multi-user's multiple-input and multiple-output (MU-MIMO).Under single transmission mode, eNB is according to the letter of feedback Channel state information can be dynamically selected the transmission of the SU-MIMO of downlink or the transmission of MU-MIMO, referred to as SU/MU MIMO Switching at runtime.
Nonetheless, with the arrival in intelligent epoch, it has been found that using the MIMO technology of 4 or 8 antennas to system The promotion of capacity has been insufficient for the explosive growth of flow.So a kind of novel multi-antenna technology is developed, MIMO technology i.e. based on extensive antenna places dozens or even hundreds of antenna (or oscillator) in base station side, it is contemplated that These large-scale antennas generally with plane or are similar to plane in base station side by the size of antenna, and land occupation and installation Form place, when placing becomes a planar array, such as 32 antennas (oscillator) are horizontally arranged 8 vertical single polarization days Line, 4 row of vertical direction (shown in Fig. 1) are horizontally arranged 8 positive and negative 45 degree of intersections dual polarized antennas, 4 row of vertical direction (Fig. 2 institute Show), 64 antennas, horizontal direction places 8 vertical single-polarized antennas, and vertical direction is positioned to 8 rows (Fig. 3), 64 antennas, water Square to place 8 positive and negative 45 degree of dual polarized antennas, vertical direction is positioned to 8 rows (Fig. 4) for another example, in the horizontal direction by 8 Intersect dual polarization or single polarization is placed as an arc-shaped or round shape, the equally spaced placement of vertical direction, forms cylinder Face etc. (as shown in Figure 5).Placing extensive antenna (oscillator) in base station side is advantageous in that and can take simultaneously compared with multi-user Business and the AF panel between user horizontal (for example is transmitted into data, i.e. multiuser MIMO skill simultaneously lower for 8 users Art: MU-MIMO), moreover, it can also overcome the homogenous frequency signal of adjacent base station in network to interfere, finally, due to antenna number Purpose increases, and each corresponding array gain of user serviced increases, and improves by service subscriber signal power, integrates Come, due to promoting the signal power of multiple target users simultaneously and inhibiting the interference of homogenous frequency signal, so this based on extensive The MIMO technology of antenna significantly improves the capacity of each base station, that is, improves the flow of overall network, becomes following wireless One of key technology of communication.
But above-mentioned technology the problem of there is also itself, to obtain one of above mentioned various gains and benefit Important prerequisite is exactly: base station must accurately obtain the wireless channel coefficient matrix information between base station and each user.In FDD In system, terminal utilizes channel state information reference symbol (CSI-RS, Channel State Information- Reference Signal) measurement channel coefficient matrix, then by quantization as a code word in code book (CodeBook), Code book refers to the set of multiple matrixes or vector predetermined, respectively saves a identical copy in base station and terminal side, Perhaps vector is known as a code word the corresponding information of code word is then passed through uplink control channel or shared letter each matrix Road feeds back to base station, and it is terminal transmission data etc. that base station, which is based on this information,.So the accuracy of the channel information of feedback takes completely It certainly in the design of code book, but needs to consider the compromise between expense and performance when design codebooks, because of opening when feedback Pin is also the problem of real system faces.Compromise again for the accuracy that should consider the channel information fed back and considers that feedback is opened Not yet there is effective solution at present in the problem of pin.
Summary of the invention
In view of this, the main purpose of the present invention is to provide a kind of methods of feeding back channel state information, feedback channel The terminal of status information and the base station for obtaining channel state information, had not only promoted the accuracy of feedback information, but also can save feedback Expense.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of method of feeding back channel state information, this method comprises:
For user equipment (UE) to base station feedback channel state information, the channel state information includes codebook index information, ratio Example parameter；
The codebook index information includes: first kind code book index I and/or the second class code book index J；The scale parameter It include: the first scale parameter α and/or the second scale parameter β.
Wherein, the first kind code book index I includes: i, (i1, i2), any one in (i1 i2 i3)；The i, The i1, the i2, the i3 are greater than the positive integer equal to 1；
The second class code book index J is j or (j1, j2)；The j, the j1, the j2 are greater than equal to 1 just Integer；
The first scale parameter α be plural number, 0≤| α |≤1；The second scale parameter β is plural number.
Wherein, this method further include:
The UE obtains channel matrix H, determines the code word matrix in total number of plies information υ and the first codebook matrix according to HIts corresponding index is first kind code book index I, and feeds back first kind code book index I, whereinIt is one NtThe complex matrix of × υ；
The UE is according to the code word matrixGenerate the second class code book；
The UE determines the code word matrix BMat in the second class code book according to HJ, corresponding index is the second class code book rope Draw J, and feed back the second class code book index J, wherein BMatJIt is a NtThe complex matrix of × υ.
Wherein, the code word matrixWhen I is (i1, i2),
The code word matrix I be (i1 i2 i3) when,
Wherein, the Func3, the Func4 respectively indicate function, describedThe Kronecker product of representing matrix or with The other algorithms or implementation of Kronecker product equivalence.
Wherein, according to the code word matrixGenerate the second class code book, each code word of the second class code book withIt is orthogonal.
Wherein, according to the code word matrixGenerate the second class code book, including by the first kind code book withOrthogonal code word constitutes the second class code book, and the code word number that the second class code book includes is M, 0≤M≤N-1, wherein institute Stating N indicates the code word number of first kind code book.
Wherein, according to the code word matrixThe second class code book is generated, including for givenBy code All code word Ws 2 in this C21、W22、…、W2MIt projects toOrthogonal intersection space, obtain M projection code word, the M projection Code word constitutes the second class code book；The code book C2, by code word W 21、W22、…、W2MIt constitutes.
Wherein, by the code word W 2 in C2kIt projects toOrthogonal intersection space indicate are as follows:
K=1 ..., M, E indicate Nt×NtUnit matrix.
Wherein, according to the code word matrixGenerating the second class code book isSecondary series to it is last one column, k =1 ..., M,It indicates by vectorThe householder transformation matrix of construction.
Wherein, according to the code word matrixThe code in the second class code book generated Word has structureWherein, A1The orthogonal and/or A with Func3 (i1)2It is orthogonal with Func4 (i2),Gram of representing matrix Kronecker product or other algorithms or implementation with Kronecker product equivalence.
Wherein, according to the code word matrixIn the second class code book generated Code word hasWherein, A1The orthogonal and/or A with Func3 (i1, i2)2It is orthogonal with Func4 (i3),Gram of representing matrix Kronecker product or other algorithms or implementation with Kronecker product equivalence.
Wherein, this method further include: the base station according to the UE that the receives first kind code book index I sent and/or Second class code book index J, the first scale parameter α and/or the second scale parameter β are counted using inquiring preset code book table and combining The mode of calculation obtains code word matrix.
Wherein, the code word matrix that the base station obtainsFunc1 indicates letter Number, the calculated result of Func1 (I) is NT× υ matrix is the i-th code word of first kind code book；Func2 representative function, Func2 (J) calculated result is NT× υ matrix is the j-th code of the second class code book generated according to the i-th code word of first kind code book Word, α, β are plural numbers, are scale parameter.
Wherein, this method further include: code word matrix of the base station to acquisitionDo normalized.
Wherein, this method further include: the code word matrix that the base station reference obtains is scheduled UE, selects downlink transfer Mode is communicated with UE；
The downlink transmission mode includes single user MIMO transmission mode, Multi-user mimo transmissions Any one in mode, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission mode.
A kind of terminal of feeding back channel state information, the terminal include:
Feedback unit, for base station feedback channel state information, the channel state information include codebook index information, Scale parameter；Wherein, the codebook index information includes: first kind code book index I and/or the second class code book index J；The ratio Example parameter includes: the first scale parameter α and/or the second scale parameter β.
Wherein, the feedback unit further comprises:
Information generates subelement, for generating the first kind code book index I, the first kind code book index I include: i, Any one in (i1, i2), (i1 i2 i3)；The i, the i1, the i2, the i3 are greater than the positive integer equal to 1； The second class code book index J is generated, the second class code book index J is j or (j1, j2)；The j, the j1, the j2 It is greater than the positive integer equal to 1；Generating the first scale parameter α, the first scale parameter α is plural number, 0≤| α |≤1； The second scale parameter β is generated, the second scale parameter β is plural number.
Wherein, the information generates subelement, is further used for obtaining channel matrix H by UE, determines total number of plies according to H Code word matrix in information υ and the first codebook matrixIts corresponding index is first kind code book index I, and is fed back First kind code book index I, whereinIt is a NtThe complex matrix of × υ；The UE is according to the code word matrix Generate the second class code book；The UE determines the code word matrix BMat in the second class code book according to HJ, corresponding index is second Class code book index J, and feed back the second class code book index J, wherein BMatJIt is a NtThe complex matrix of × υ.
Wherein, the information generates subelement, is further used for the code word matrixWhen I is (i1, i2),The code word matrixWhen I is (i1 i2 i3),Wherein, the Func3, the Func4 respectively indicate function, describedIt indicates The Kronecker product of matrix or other algorithms or implementation with Kronecker product equivalence.
Wherein, the information generates subelement, is further used for described according to code word matrixGenerate the second class code This, each code word of the second class code book withIt is orthogonal.
Wherein, the information generates subelement, is further used for according to the code word matrixGenerate the second class code This, including by the first kind code book withOrthogonal code word constitutes the second class code book, the code that the second class code book includes Word number is M, 0≤M≤N-1, wherein the N indicates the code word number of first kind code book.
Wherein, the information generates subelement, is further used for according to the code word matrixGenerate the second class code This, including for givenBy code word Ws 2 all in code book C21、W22、…、W2MIt projects toOrthogonal space Between, M projection code word is obtained, the M projection code word constitutes the second class code book；The code book C2, by code word W 21、W22、…、 W2MIt constitutes.
Wherein, the information generates subelement, is further used for the code word W 2 in C2kWhat is projected to is orthogonal Space representation are as follows:K=1 ..., M, E table Show Nt×NtUnit matrix.
Wherein, the information generates subelement, is further used for according to the code word matrixGenerate the second class code Originally it isSecondary series to it is last one column, k=1 ..., M,It indicates by vectorConstruction Householder transformation matrix.
Wherein, the information generates subelement, is further used for according to the code word matrix The code word in the second class code book generated hasWherein, A1The orthogonal and/or A with Func3 (i1)2Just with Func4 (i2) It hands over,The Kronecker product of representing matrix or other algorithms or implementation with Kronecker product equivalence.
Wherein, the information generates subelement, is further used for according to the code word matrix The code word in the second class code book generated hasWherein, A1The orthogonal and/or A with Func3 (i1, i2)2With Func4 It is (i3) orthogonal,The Kronecker product of representing matrix or other algorithms or implementation with Kronecker product equivalence.
A kind of base station obtaining channel state information, the base station includes:
Acquiring unit, for obtaining the channel state information of user equipment (UE) feedback, the channel state information includes code This index information, scale parameter；Wherein, the codebook index information includes: first kind code book index I and/or the second class code book Index J；The scale parameter includes: the first scale parameter α and/or the second scale parameter β.
Wherein, the acquiring unit further comprises:
Parsing subunit, for parsing the first kind code book index I, the first kind code book index I include: i, Any one in (i1, i2), (i1 i2 i3)；The i, the i1, the i2, the i3 are greater than the positive integer equal to 1； The second class code book index J is parsed, the second class code book index J is j or (j1, j2)；It is the j, the j1, described J2 is greater than the positive integer equal to 1；Parsing the first scale parameter α, the first scale parameter α is plural number, 0≤| α | ≤1；The second scale parameter β is parsed, the second scale parameter β is plural number.
Wherein, the parsing subunit is further used for the first kind code book index I sent according to the UE received And/or the second class code book index J, the first scale parameter α and/or the second scale parameter β, using inquiring preset code book table and tie Total mode calculated parses acquisition code word matrix.
Wherein, the parsing subunit is further used for the code word matrix that parsing obtains The calculated result of Func1 representative function, Func1 (I) is NT× υ matrix is the i-th code word of first kind code book；Func2 is indicated The calculated result of function, Func2 (J) is NT× υ matrix is the second class code generated according to the i-th code word of first kind code book This j-th code word, α, β are plural numbers, are scale parameter.
Wherein, the acquiring unit further comprises:
Normalized subelement, for base station to the code word matrix of acquisitionDo normalized.
Wherein, the acquiring unit further comprises:
Subelement is dispatched, the code word matrix obtained for the base station reference is scheduled UE, selects downlink transfer side Formula is communicated with UE；The downlink transmission mode includes that single user MIMO transmission mode, multi-user's multi input are more Export any one in transmission mode, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission mode.
The method comprise the steps that UE, to base station feedback channel state information, the channel state information includes code book index Information, scale parameter；The codebook index information includes: first kind code book index I and/or the second class code book index J；The ratio Example parameter includes: the first scale parameter α and/or the second scale parameter β.Using the present invention, the accuracy of feedback information had both been promoted, Feedback overhead can be saved again.
Detailed description of the invention
Fig. 1 is the planar antenna array figure that 32 vertical single-polarized antennas of 4 rows 8 column are constituted；
Fig. 2 is the planar antenna array figure that 32 positive and negative 45 ° of dual polarized antennas of 4 rows 4 column are constituted；
Fig. 3 is the planar antenna array figure that 64 vertical single-polarized antennas of 8 rows 8 column are constituted；
Fig. 4 is the planar antenna array figure that 64 positive and negative 45 ° of dual polarized antennas of 8 rows 4 column are constituted；
Fig. 5 is the 32 antenna non-planar antennas array of figure based on vertical polarized antenna；
Fig. 6 is the implementation process schematic diagram of embodiment of the present invention method.
Specific embodiment
The implementation of technical solution is described in further detail with reference to the accompanying drawing.
Since the accuracy of channel information depends entirely on the design of code book, and need to consider expense when design codebooks Compromise between performance, because expense is also the problem of real system faces, especially for extensive MIMO and 3D MIMO For these large-scale antenna arrays of system, the dimension of channel coefficient matrix is very big, wants more accurately to quantify at this time These coefficient matrixes, expense is very big, therefore, the scheme proposed by the present invention for obtaining channel state information, to codebook design When codebook construction and feedback handled, so that the accuracy of feedback information can be promoted and save feedback overhead.
Specifically, it for supporting 3D wave beam forming and/or extensive Massive MIMO transmission mode, on the one hand needs Backwards compatibility is kept, to support the MIMO/COMP of each version of R8~R11 as priority principle, R8~R11's compatible as far as possible On the other hand the feedback form of CQI/PMI/RI needs to consider forward compatibility, consideration is to 3D wave beam forming and/or on a large scale The support of Massive MIMO guarantees that new technology has acceptable performance.And existing state information feedback method PMI Precision is relatively low, causes base station that can not correctly select the down channel used when sending data to UE, and then lead to new biography Reasonable performance is not achieved in the MU-MIMO system of transmission method.In order to support 3D wave beam forming and/or extensive Massive MIMO Downlink transfer, it is provided by the invention obtain channel state information scheme, pass through obtain channel status information a kind of shape Formula, i.e. pre-coding matrix instruction promote accuracy and the saving feedback overhead of feedback information, in the present invention, precoding to realize Matrix instruction is specially pre-coding matrix index, can be compatible with SU-MIMO and MU-MIMO using the present invention, and can guarantee 3D wave The system performance of beam figuration and/or extensive Massive MIMO, especially suitable for extensive MIMO and 3D mimo system.
The invention mainly comprises the following contents:
A kind of method of feeding back channel state information, comprising:
For UE to base station feedback channel state information, the channel state information includes codebook index information, scale parameter, with Just codebook index information, scale parameter and total number of plies information are fed back to base station such as eNB, the channel status letter of indicating downlink by UE Breath.Wherein, the codebook index information includes: first kind code book index I and the second class code book index J；The scale parameter packet It includes: the first scale parameter α and/or the second scale parameter β.
Further, first kind code book index I includes following one: i, (i1, i2), (i1 i2 i3), wherein i, i1, I2, i3 are greater than the positive integer equal to 1；
Second class code book index J is j or (j1, j2), wherein j, j1, j2 are greater than the positive integer equal to 1；
First scale parameter α be plural number, 0≤| α |≤1, preferably value be 1；Second scale parameter β is plural number.
Further, this method further include: the UE obtains channel matrix H, determines total number of plies information υ and the according to H Code word matrix in one codebook matrixIts corresponding index is first kind code book index I, and feeds back first kind code book Index I, whereinIt is a NtThe complex matrix of × υ；
The UE is according to the code word matrixGenerate the second class code book；
The UE determines the code word matrix BMat in the second class code book according to HJ, corresponding index is the second class code book rope Draw J, and feed back the second class code book index J, wherein BMatJIt is a NtThe complex matrix of × υ.
Further, code word matrixThere is feature when I is (i1, i2) There is feature when I is (i1 i2 i3)Wherein, Func3, Func4 distinguish table Show function,The Kronecker product (keroneck product) of representing matrix or other mathematics with Kronecker product equivalence Calculation method or implementation.
Further, according to the code word matrixGenerate the second class code book, each code of the second class code book Word withIt is orthogonal.
Further, according to the code word matrixThe second class code book is generated, including will be in the first kind code book WithOrthogonal code word constitutes the second class code book, and the code word number that the second class code book includes is M, 0≤M≤N-1, wherein The N indicates the code word number of first kind code book.
Further, according to the code word matrixThe second class code book is generated, including for given By code word Ws 2 all in code book C21、W22、…、W2MIt projects toOrthogonal intersection space, obtain M projection code word, the M It projects code word and constitutes the second class code book；The code book C2, by code word W 21、W22、…、W2MIt constitutes.
Further, by the code word W 2 in C2kIt projects toOrthogonal intersection space indicate are as follows:
K=1 ..., M, E indicate Nt×NtUnit matrix.The W2kIn k=1 ..., M, the W2kIndicate code book above All code word Ws 2 in C21、W22、…、W2M。
Further, according to the code word matrixGenerating the second class code book isSecondary series to last one Column, k=1 ..., M,It indicates by vectorThe householder transformation matrix of construction.
Further, according to the code word matrixIn the second class code book generated Code word have featureWherein, A1The orthogonal and/or A with Func3 (i1)2It is orthogonal with Func4 (i2),Representing matrix Kronecker product or other algorithms or implementation with Kronecker product equivalence.
Further, according to the code word matrixThe the second class code book generated In code word have featureWherein, A1The orthogonal and/or A with Func3 (i1, i2)2It is orthogonal with Func4 (i3),It indicates The Kronecker product of matrix or other algorithms or implementation with Kronecker product equivalence.
Further, this method further include: the base station receive UE transmission codebook index information I and J, scale parameter α, β obtains code word matrix by the way of inquiring preset code book table and combination calculating according to the information.
Further, the code word matrix, which is characterized in that The calculated result of Func1 representative function, Func1 (I) is NT× υ matrix is the i-th code word of first kind code book.Func2 is indicated The calculated result of function, Func2 (J) is NT× υ matrix is the second class code generated according to the i-th code word of first kind code book This j-th code word, α, β are plural numbers, are scale parameter.
Further, Func1 (I) and Func2 (J) is orthogonal, i.e. Func1 (I)HFunc2 (J)=0, Func1 (I)H Indicate the complex conjugate of Func1 (I), the multiplication is Matrix Multiplication.
Further, the base station is to code word matrixDo normalized.
Further, the code word that the base station reference obtains is scheduled UE, and downlink transmission mode and UE is selected to carry out Communication, the downlink transmission mode includes following one kind: how defeated single user MIMO transmission mode, multi-user's multi input be Transmission mode, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission mode out.
A kind of terminal of feeding back channel state information, the description of specific implementation and above method description are consistent, including feedback Unit, for the UE to base station feedback channel state information, the channel state information includes codebook index information, ratio ginseng Number；Wherein, the codebook index information includes: first kind code book index I and/or the second class code book index J；The scale parameter It include: the first scale parameter α and/or the second scale parameter β.
The feedback unit further comprises:
Information generates subelement, for generating the first kind code book index I, the first kind code book index I include: i, Any one in (i1, i2), (i1 i2 i3)；The i, the i1, the i2, the i3 are greater than the positive integer equal to 1； The second class code book index J is generated, the second class code book index J is j or (j1, j2)；The j, the j1, the j2 It is greater than the positive integer equal to 1；Generating the first scale parameter α, the first scale parameter α is plural number, 0≤| α |≤1, Preferred value is 1；The second scale parameter β is generated, the second scale parameter β is plural number.
The information generates subelement, is further used for obtaining channel matrix H by UE, determines total number of plies information υ according to H And the first code word matrix in codebook matrixIts corresponding index is first kind code book index I, and feeds back first Class code book index I, whereinIt is a NtThe complex matrix of × υ；The UE is according to the code word matrixIt generates Second class code book；The UE determines the code word matrix BMat in the second class code book according to HJ, corresponding index is the second class code This index J, and feed back the second class code book index J, wherein BMatJIt is a NtThe complex matrix of × υ.
The information generates subelement, is further used for the code word matrixWhen I is (i1, i2),The code word matrixWhen I is (i1 i2 i3), Wherein, the Func3, the Func4 respectively indicate function, describedThe Kronecker product of representing matrix or and Kronecker Product other algorithms or implementation of equal value.
The information generates subelement, is further used for described according to code word matrixGenerate the second class code book, institute State each code word of the second class code book withIt is orthogonal.
The information generates subelement, is further used for according to the code word matrixThe second class code book is generated, is wrapped Include by the first kind code book withOrthogonal code word constitutes the second class code book, the code word number that the second class code book includes For M, 0≤M≤N-1, wherein the N indicates the code word number of first kind code book.
The information generates subelement, is further used for according to the code word matrixThe second class code book is generated, is wrapped It includes for givenBy code word Ws 2 all in code book C21、W22、…、W2MIt projects toOrthogonal intersection space, obtain To M projection code word, the M projection code word constitutes the second class code book；The code book C2, by code word W 21、W22、…、W2MStructure At.
The information generates subelement, is further used for the code word W 2 in C2kThe orthogonal intersection space table projected to It is shown as:K=1 ..., M, E indicate Nt×Nt Unit matrix.The W2kIn k=1 ..., M, the W2kIndicate all code word Ws 2 in code book C2 above1、W22、…、 W2M。
The information generates subelement, is further used for according to the code word matrixGenerating the second class code book isSecondary series to it is last one column, k=1 ..., M,It indicates by vectorThe householder of construction Transformation matrix.
The information generates subelement, is further used for according to the code word matrixIt generates Code word in second class code book hasWherein, A1The orthogonal and/or A with Func3 (i1)2It is orthogonal with Func4 (i2), The Kronecker product of representing matrix or other algorithms or implementation with Kronecker product equivalence.
The information generates subelement, is further used for according to the code word matrixIt is raw At the second class code book in code word haveWherein, A1The orthogonal and/or A with Func3 (i1, i2)2Just with Func4 (i3) It hands over,The Kronecker product of representing matrix or other algorithms or implementation with Kronecker product equivalence.
A kind of base station eNodeB obtaining channel state information, the description of specific implementation and above method description are consistent, packet Include: acquiring unit, for obtaining the channel state information of UE feedback, the channel state information includes codebook index information, ratio Example parameter；Wherein, the codebook index information includes: first kind code book index I and/or the second class code book index J；The ratio Parameter includes: the first scale parameter α and/or the second scale parameter β.
The acquiring unit further comprises:
Parsing subunit, for parsing the first kind code book index I, the first kind code book index I include: i, Any one in (i1, i2), (i1 i2 i3)；The i, the i1, the i2, the i3 are greater than the positive integer equal to 1； The second class code book index J is parsed, the second class code book index J is j or (j1, j2)；It is the j, the j1, described J2 is greater than the positive integer equal to 1；Parsing the first scale parameter α, the first scale parameter α is plural number, 0≤| α | ≤ 1, preferably value is 1；Second scale parameter β is plural number.
The parsing subunit is further used for according to the UE that the receives first kind code book index I sent and/or the Two class code book index J, the first scale parameter α and/or the second scale parameter β are calculated using inquiring preset code book table and combining Mode parse acquisition code word matrix.
The parsing subunit is further used for the code word matrix that parsing obtains The calculated result of Func1 representative function, Func1 (I) is NT× υ matrix is the i-th code word of first kind code book；Func2 is indicated The calculated result of function, Func2 (J) is NT× υ matrix is the second class code generated according to the i-th code word of first kind code book This j-th code word, α, β are plural numbers, are scale parameter.
The acquiring unit further comprises:
Normalized subelement, for base station to the code word matrix of acquisitionDo normalized.
The acquiring unit further comprises:
Subelement is dispatched, the code word matrix obtained for the base station reference is scheduled UE, selects downlink transfer side Formula is communicated with UE；The downlink transmission mode includes that single user MIMO transmission mode, multi-user's multi input are more Export any one in transmission mode, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission mode.
In conclusion using the solution of the present invention, when user equipment is to network side feeding back channel state information, in the letter The index information of the code book, the channel state information of indicating downlink are carried in breath, in this way, one side network side, which can be compatible with, to be made With the channel state information format of R10 version, to realize the multiple antennas function before R10 version, such as Single User MIMO；It is another Aspect, network side substantially reduce quantization error by the second class code book index, to significantly increase 3D wave beam forming or big rule The performance of mould Massive mimo system.By new code book generation and representation method, efficiency of transmission and transmission matter can be improved Amount, solves the problems, such as that MU-MIMO lacks accurate channel state information in new transmission mode.
Below to present invention citing description.
In order to obtain higher peaks spectrum efficiency, after LTE-A R11 in system, downlink needs support the tax of 3 dimension wave beams The transmission of shape and/or extensive Massive MIMO, on the one hand, the feedback control signaling of channel information needs to keep backward compatibility Property, to support SU-MIMO as priority principle, it is compatible with the feedback form of the CQI/PMI/RI before existing R11 as far as possible；Another party Face, the feeding back channel state information of channel information need to consider forward compatibility, needs to redesign new R12 or later Code book, to improve feedback accuracy, so that the better support to 3 dimension wave beam formings and/or extensive Massive MIMO, guarantees New technology has acceptable performance.
Embodiment 1
In the present embodiment, if first kind code book index I is (i1, i2), then UE passes through using I and total number of plies υ as rope Draw the preset first kind code book table of inquiry and can indicate a complex matrix Func3 and Func4 show respectively function,The Kronecker product (keroneck product) of representing matrix or and Crow Interior gram of product other mathematic calculations of equal value, implementation.
In the present embodiment, there is a more specifical example.If base station side is configured with 8 × N2Root antenna port, antenna Or the arrangement (32 antennas are as shown in Fig. 1, and 64 antennas are as shown in Figure 3) of oscillator, every a line has 8 antennas in horizontal direction, A total of N in vertical direction2Row, there is N at this time1=8, generally N2Value can be 2,4,6,8,10,12,16.
The vector codeword for being 8 equipped with 128 lengthI1=1 ..., 128, it is additionally provided with 2N2A vector Code wordI2=1 ..., (2N2), whereinForm be
Here we can take
Can certainly there are other selection methods, such as non-uniform quantizing angle etc..Then first kind code book Φ1Include in total N=128*2*N2A code word, wherein the generation method of kth=8 (i1-1)+i2 code words beHere 'sIndicate kronencker product, naturally it is also possible to write as other forms, as long as but complete identical function.Wherein, k is The index of first kind code word.
Second class code word can obtain as follows.
ForIt is all withIt includes M code in the second class code book BMat, BMat that orthogonal code word, which is constituted, Word.Wherein for each specific I correspond to a second class code book, I=1,2 ..., N, wherein N indicate I can value it is total Number.
UE selects the code book index J for needing to feed back according to down channel matrix H in the second class code book BMat, Corresponding to byThe j-th code word BMat of second class code book of constructionJ, J=1,2 ..., M,.
It should be pointed out that the number of antennas N of the present embodiment horizontal direction1The form that 2,4 can also be taken, respectively corresponds The code book for 1 layer that number of antennas is 2 and 4 in LTE R8.Other the case where being greater than 1 integer can also be taken, here not one by one It enumerates.
It is important to note that the second class code book code word value and first kind code book code word value be not limited to it is described Example.
Embodiment 2
In the present embodiment, if first kind code book index I is (i1, i2), then UE passes through using I and total number of plies υ as rope Draw the preset first kind code book table of inquiry and can indicate a complex matrix Func3 and Func4 show respectively function,The Kronecker product (keroneck product) of representing matrix or and Crow Interior gram of product other mathematic calculations of equal value, implementation.
In the present embodiment, there is a more specifical example.If base station side is configured with 8 × N2Root antenna port, antenna Or the arrangement (32 antennas are as shown in Fig. 1, and 64 antennas are as shown in Figure 3) of oscillator, every a line has 8 antennas in horizontal direction, A total of N in vertical direction2Row, there is N at this time1=8, generally N2Value can be 2,4,6,8,10,12,16.
The vector codeword for being 8 equipped with 128 lengthI1=1 ..., 128, it is additionally provided with 2N2A vector Code wordI2=1 ..., (2N2), whereinForm be
Here we can take
Can certainly there are other selection methods, such as non-uniform quantizing angle etc..Then first kind code book Φ1Include in total N=128*2*N2A code word, wherein the generation method of kth=8 (i1-1)+i2 code words beHere 'sIndicate kronencker product, naturally it is also possible to write as other forms, as long as but complete identical function.Wherein, k is The index of first kind code word.
Second class code word can obtain as follows.
For given by code word Ws 2 all in code book C21、W22、…、W2MWhat is projected to is orthogonal Space, obtains M projection code word, and the M projection code word constitutes the second class code book；The code book C2, by code word W 21、 W22、…、W2MIt constitutes；Wherein, the code word W 2 in C2kTo the rectangular projection of complementary space can indicate are as follows:K=1 ..., M, E indicate Nt×NtList Position battle array.
Code book C2, by code word W 21、W22、…、W2MIt constitutes.A kind of special circumstances, code book C2 and first kind code book can be Same codebook.
UE is according to down channel matrix, and search needs the second class codewords indexes J fed back in the second class code book, corresponds to J-th code word BMat in second class code bookJ。
It should be pointed out that the number of antennas N of the present embodiment horizontal direction1The form that 2,4 can also be taken, respectively corresponds The code book for 1 layer that number of antennas is 2 and 4 in LTE R8.Other the case where being greater than 1 integer can also be taken, here not one by one It enumerates.
It is important to note that the second class code book code word value and first kind code book code word value be not limited to it is described Example.
Embodiment 3
In the present embodiment, if first kind code book index I is (i1, i2), then UE is by by I and total conduct of number of plies υ=1 The preset first kind code book table of search index simultaneously can indicate a complex matrix Func3 and Func4 show respectively function,The Kronecker product (keroneck product) of representing matrix or and Crow Interior gram of product other mathematic calculations of equal value, implementation.
In the present embodiment, there is a more specifical example.If base station side is configured with Nt=8 × N2Root antenna port, day The arrangement (32 antennas are as shown in Fig. 1, and 64 antennas are as shown in Figure 3) of line or oscillator, every a line has 8 days in horizontal direction Line, a total of N in vertical direction2Row, there is N at this time1=8, generally N2Value can be 2,4,6,8,10,12,16.
The vector codeword i1=1 ... for being 8 equipped with 128 length, 128, it is additionally provided with 2N2A vector Code wordForm therein is
Here we can take
Can certainly there are other selection methods, such as non-uniform quantizing angle etc..Then first kind code book Φ1Include in total N=128*2*N2A code word, wherein the generation method of kth=8 (i1-1)+i2 code words beHere 'sIndicate kronencker product, naturally it is also possible to write as other forms, as long as but complete identical function.Wherein, k is The index of first kind code word.
Second class code word can obtain as follows.
For what is givenConstructionHouseholder transformation matrix, method is as follows:
IfFirst elementIt is real number, then generates vector
IfFirst elementIt is plural number, then enablesIn being generated using c Between variableUltimately produce vector v=d-e1, wherein e1=[1 0 ... 0]TBe first element be 1, other elements It is all 0, length NtColumn vector；
It converts to obtain matrix H using Householder:
WhereinIt is Nt×NtUnit matrix.
UE is according to down channel matrix, and search needs the second class codewords indexes J fed back in the second class code book, corresponds to J-th code word BMat in second class code bookJ。
It should be pointed out that the number of antennas N of the present embodiment horizontal direction1The form that 2,4 can also be taken, respectively corresponds The code book for 1 layer that number of antennas is 2 and 4 in LTE R8.Other the case where being greater than 1 integer can also be taken, here not one by one It enumerates.
It is important to note that the second class code book code word value and first kind code book code word value be not limited to it is described Example.
Embodiment 4
In the present embodiment, if first kind code book index I is (i1, i2), then UE passes through using I and total number of plies υ as rope Draw the preset first kind code book table of inquiry and can indicate a complex matrix Func3 and Func4 show respectively function,The Kronecker product (keroneck product) of representing matrix or and Crow Interior gram of product other mathematic calculations of equal value, implementation.
In the present embodiment, there is a more specifical example.If base station side is configured with 8 × N2Root antenna port, antenna Or the arrangement (32 antennas are as shown in Fig. 1, and 64 antennas are as shown in Figure 3) of oscillator, every a line has 8 antennas in horizontal direction, A total of N in vertical direction2Row, there is N at this time1=8, generally N2Value can be 2,4,6,8,10,12,16.
The vector codeword for being 8 equipped with 128 lengthI1=1 ..., 128, it is additionally provided with 2N2A vector Code wordI2=1 ..., (2N2), whereinForm be
Here we can take
Can certainly there are other selection methods, such as non-uniform quantizing angle etc..Then first kind code book Φ1Include in total N=128*2*N2A code word, wherein the generation method of kth=8 (i1-1)+i2 code words beHere 'sIndicate kronencker product, naturally it is also possible to write as other forms, as long as but complete identical function.Wherein, k is The index of first kind code word.
Given first kind code book index I (i1, an i2) and total number of plies υ can determine the second pre-generated class code book, Second class code book is by is characterized byAnd/orCode word structure It is at, wherein Func5 (i1, k1) and Func3 (i1) orthogonal code book Ci1The code word that middle index is k1, Ci1It is 8 for length Unit vector；Func6 (i2, k2) is and Func4 (i2) orthogonal code book Ci2The code word that middle index is k2, Ci2It is N for length2's Unit vector.Here, Func3, Func4, Func5 and Func6 show respectively function, the Kronecker product of representing matrix (keroneck product) or with other mathematic calculations of Kronecker product equivalence, implementation.
UE is according to channel information, in Ci1The code book index j1 that middle search needs to feed back, corresponding code word are Ci1(j1), In Ci2The code book index j2 that middle search needs to feed back, corresponding code word are Ci2(j2), and J is fed back to the base station, the shape of J Formula is (j1, j2).
It should be pointed out that the number of antennas N of the present embodiment horizontal direction1The form that 2,4 can also be taken, respectively corresponds The code book for 1 layer that number of antennas is 2 and 4 in LTE R8.Other the case where being greater than 1 integer can also be taken, here not one by one It enumerates.
It is important to note that the second class code book code word value and first kind code book code word value be not limited to it is described Example.
Embodiment 5
In the present embodiment, if first kind code book index I be (i1, i2, i3), then UE by using I and total number of plies υ as The preset first kind code book table of search index simultaneously can indicate a complex matrix Func3 and Func4 show respectively function,The Kronecker product (keroneck product) of representing matrix or and Crow Interior gram of product other mathematic calculations of equal value, implementation.
In the present embodiment, there is a more specifical example.If base station side is configured with 8 × N2Root antenna port, antenna Or the arrangement (32 antennas are as shown in Fig. 2, and 64 antennas are as shown in Figure 4) of oscillator, every a line has 8 antennas in horizontal direction, It is dual polarized antenna, a total of N in vertical direction2Row, there is N at this time1=8, generally N2Value can be 2,4,6,8,10, 12,16。
The vector codeword i=1 ... for being 8 equipped with 128 length, 128, wherein i indicate i1 and I-th kind of value in 128 kinds of values of i2, is additionally provided with 2N2A vector codewordIts In form beHere we can be with It takes
Can certainly there are other selection methods, such as non-uniform quantizing angle etc..Then first kind code book Φ1Include in total N=128*2*N2A code word, wherein the generation method of kth=8 (i-1)+i2 code words beThis InIndicate kronencker product, naturally it is also possible to write as other forms, as long as but complete identical function.Wherein, k It is the index of first kind code word.
Given first kind code book index I (i1, i2, an i2) and total number of plies υ can determine the second pre-generated class code This, the second class code book has feature by allAnd/or Code word constitute.Wherein, Func5 (i1, i2, k1) is and Func3 (i1, i2) orthogonal code book Ci1,i2The code that middle index is k1 Word, is the unit vector that length is 8, Func6 (i3, k3) and the orthogonal code book C of Func4 (i3)i3Middle index is the code word of k3, is Length is N2Unit vector.Here, Func3, Func4, Func5 and Func6 show respectively function,Gram of representing matrix Kronecker product (keroneck product) or with other mathematic calculations of Kronecker product equivalence, implementation.
UE is according to channel information, in Ci1,i2The code book index j1 that middle search needs to feed back, corresponding code word are Ci1,i2 (j1), in Ci2The code book index j2 that middle search needs to feed back, corresponding code word are Ci2(j2), and J is fed back to the base station, J Form be (j1, j2).
It should be pointed out that the number of antennas N of the present embodiment horizontal direction1The form that 2,4 can also be taken, respectively corresponds The code book for 1 layer that number of antennas is 2 and 4 in LTE R8.Other the case where being greater than 1 integer can also be taken, here not one by one It enumerates.
It is important to note that the second class code book code word value and first kind code book code word value be not limited to it is described Example.
Embodiment 6
This example demonstrates that how terminal selects code word, and generate corresponding feedback information.
Terminal obtains the wireless channel coefficient matrix H between terminal and base station by down channel measuring reference signals, so Afterwards from first kind code book Φ1Middle selection code word C1,k, k=0,1 ..., N, here, N are the code word number of first kind code book.The code Corresponding index is PMI1 to word in the codebook, while terminal calculates code word C1,kRelated coefficient between channel coefficient matrix H is α.Terminal judges whether to need to feed back the codewords indexes of the second class code book according to the value of α, and generates corresponding instruction information The information of PMI1 and IndMessage are fed back to base station by IndMessage, terminal.The code word of the second class code book is done if necessary Index feedback, then terminal is in C1,k, k=0,1 ..., the corresponding second class code book of NMiddle selection code word C2,l, while calculating code word C2,lRelated coefficient between channel coefficient matrix H is β.Preferably, we can feed back 1 parameter, i.e., only feed back β, at this time α=1 does not need to feed back.Coefficient is generated using α and βOrTerminal utilizes pre-generated plural quantization code This Ψ is by G1It is quantified as the plural β that index is Index, terminal is by terminal by C2,lIn the second class code bookIn index PMI2 it is anti- It feeds base station, while index Index information is fed back into base station.
Embodiment 7
This example demonstrates that how base station obtains the channel information of terminal using the feedback of terminal.
If terminal only feeds back the corresponding information PMI1 of level-one code word, base station is by code book Φ1The code that middle index is PMI1 Word C1,kAs the corresponding channel information of terminal；
If terminal feeds back two-stage code word PMI1 and PMI2 and complex coefficient quantitative information Index, if PMI1 is in Φ1In Corresponding code word is C1,k, PMI2 existsIn corresponding code word be C2,l, wherein Index is corresponding in complex coefficient quantization code book Ψ Value be β.
If system is presetThen base station utilizes the channel information of following formula computing terminals
If system is presetThen base station utilizes the channel information of following formula computing terminals
Embodiment 8
As shown in fig. 6, the general place of Single User MIMO once and multiuser MIMO switching at runtime transmission mode is described below Reason process, comprising:
Step 101, transmitting terminal eNB sends descending channel information pilot reference information to UE, under user terminal test Row channel status；
Step 102, UE carries out down channel estimation according to the pilot frequency information received；
Step 103, UE determines the format of feeding back channel state information, index and the second class code book including first kind code book Index；
Step 104, UE gives the information feedback of index and the second class code book index comprising first kind code book eNB；
Step 105, eNB is according to the channel state information of feedback, be dynamically selected the SU-MIMO of downlink transmission or The transmission mode of MU-MIMO, and weight is generated according to the transmission mode of selection and using obtained code word, it carries out logical with UE Letter.
The system for realizing the above method includes UE and base station, and the UE is used for codebook index information, scale parameter and total The number of plies is fed back, and the codebook index information includes one kind of following information: first kind code book index I and the second class code book rope Draw J；Wherein, first kind code book index I includes following one: i, (i1, i2), (i1 i2 i3), i1 is greater than 1 positive integer, I2 and i3 is greater than the positive integer equal to 1；Second class code book index J includes following one: j or (j1, j2), wherein j, j1, J2 is greater than the positive integer equal to 1.
The base station is used for after receiving the codebook index information, scale parameter and total number of plies information of UE transmission, according to The information obtains code word matrix by the way of inquiring preset code book table and combination calculating, and normalizes to code word matrix Processing.The codebook index information includes one kind of following information: first kind code book index I and the second class code book index parameter J； Wherein, first kind code book index I includes following one: i, (i1, i2), (i1 i2 i3), and i1 is greater than 1 positive integer, i2 and I3 is greater than the positive integer equal to 1；Second class code book index J includes following one: j or (j1, j2), wherein j, j1, j2 are Positive integer more than or equal to 1.
The concrete operations of UE and base station are referring to the above method.
The high-precision channel of offer of extensive Massive MIMO transmission is provided using the method for the invention Status information.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.

Claims (29)

1. a kind of method of feeding back channel state information, which is characterized in that this method comprises:
For user equipment (UE) to base station feedback channel state information, the channel state information includes codebook index information, ratio ginseng Number, wherein
The codebook index information is first kind code book index I and the second class code book index J, and the scale parameter is the second ratio Parameter beta；
Alternatively,
The codebook index information is first kind code book index I and the second class code book index J, and the scale parameter is the first ratio Parameter alpha and the second scale parameter β, wherein
The first kind code book index I includes: i, (i1, i2), any one in (i1, i2, i3)；The i, the i1, institute State i2, the i3 is greater than positive integer equal to 1；
The UE obtains channel matrix H, determines the code word matrix in total number of plies information υ and the first codebook matrix according to HIts corresponding index is the first kind code book index I, and feeds back the first kind code book index I, whereinIt is a NtThe complex matrix of × υ；
The UE is according to the code word matrixGenerate the second class code book；
The UE determines the code word matrix BMat in the second class code book according to HJ, corresponding index is the second class code book rope Draw J, and feed back the second class code book index J, wherein BMatJIt is a NtThe complex matrix of × υ.
2. the method according to claim 1, wherein the second class code book index J is j or (j1, j2)；Institute It states j, the j1, the j2 and is greater than positive integer equal to 1；
The first scale parameter α be plural number, 0≤| α |≤1；The second scale parameter β is plural number.
3. according to the method described in claim 2, it is characterized in that, the code word matrixWhen I is (i1, i2),
The code word matrixWhen I is (i1, i2, i3),
Wherein, the Func3, the Func4 respectively indicate function,The Kronecker product of representing matrix.
4. according to the method described in claim 2, it is characterized in that, according to the code word matrixGenerate the second class code This, each code word of the second class code book withIt is orthogonal.
5. according to the method described in claim 4, it is characterized in that, according to the code word matrixGenerate the second class code This, including by the first kind code book withOrthogonal code word constitutes the second class code book, the code that the second class code book includes Word number is M, 0≤M≤N-1, wherein the N indicates the code word number of first kind code book.
6. according to the method described in claim 4, it is characterized in that, according to the code word matrixGenerate the second class code This, including for givenBy code word Ws 2 all in code book C21、W22、…、W2MIt projects toOrthogonal space Between, M projection code word is obtained, the M projection code word constitutes the second class code book；The code book C2, by code word W 21、W22、…、 W2MIt constitutes.
7. according to the method described in claim 6, it is characterized in that, by the code word W 2 in C2kIt projects toOrthogonal space Between indicate are as follows:E is indicated Nt×NtUnit matrix.
8. according to the method described in claim 4, it is characterized in that, according to the code word matrixGenerate the second class code book ForSecondary series to it is last one column,It indicates by vectorThe householder transformation matrix of construction.
9. according to the method described in claim 3, it is characterized in that, according to the code word matrix The code word in the second class code book generated has structureWherein, A1The orthogonal and/or A with Func3 (i1)2With Func4 It is (i2) orthogonal,The Kronecker product of representing matrix.
10. according to the method described in claim 3, it is characterized in that, according to the code word matrix The code word in the second class code book generated hasWherein, A1The orthogonal and/or A with Func3 (i1, i2)2With Func4 (i3) It is orthogonal,The Kronecker product of representing matrix.
11. the method according to any one of claim 4 to 10, which is characterized in that this method further include: the base station root According to the UE that the receives first kind code book index I sent and/or the second class code book index J, the first scale parameter α and/or the Two scale parameter β obtain code word matrix by the way of inquiring preset code book table and combination calculating.
12. according to the method for claim 11, which is characterized in that the code word matrix that the base station obtainsThe calculated result of Func1 representative function, Func1 (I) is NT× υ matrix is The i-th code word of first kind code book；The calculated result of Func2 representative function, Func2 (J) is NT× υ matrix, is according to first The j-th code word for the second class code book that the i-th code word of class code book generates, α, β are plural numbers, are scale parameter.
13. according to the method for claim 12, which is characterized in that this method further include: code word of the base station to acquisition MatrixDo normalized.
14. method according to claim 12 or 13, which is characterized in that this method further include: the base station reference obtains Code word matrix UE is scheduled, select downlink transmission mode communicated with UE；
The downlink transmission mode includes single user MIMO transmission mode, Multi-user mimo transmissions mould Any one in formula, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission mode.
15. a kind of terminal of feeding back channel state information, which is characterized in that the terminal includes:
Feedback unit, for base station feedback channel state information, the channel state information to include codebook index information, ratio Parameter, wherein
The codebook index information is first kind code book index I and the second class code book index J, and the scale parameter is the second ratio Parameter beta；
Alternatively,
The codebook index information is first kind code book index I and the second class code book index J, and the scale parameter is the first ratio Parameter alpha and the second scale parameter β；
The feedback unit further comprises that information generates subelement；
The information generates subelement, for generate the first kind code book index I include: i, (i1, i2), in (i1, i2, i3) Any one, the i, the i1, the i2, the i3 are greater than the positive integer equal to 1；
The information generates subelement, is further used for obtaining channel matrix H by UE, according to H determine total number of plies information υ and Code word matrix in first codebook matrixIts corresponding index is first kind code book index I, and feeds back first kind code book Index I, whereinIt is a NtThe complex matrix of × υ；The UE is according to the code word matrixGenerate the second class Code book；The UE determines the code word matrix BMat in the second class code book according to HJ, corresponding index is the second class code book index J, and feed back the second class code book index J, wherein BMatJIt is a NtThe complex matrix of × υ.
16. terminal according to claim 15, which is characterized in that the information generates subelement, is further used for generating The second class code book index J is j or (j1, j2), and the j, the j1, the j2 are greater than the positive integer equal to 1；It generates The first scale parameter α, the first scale parameter α be plural number, 0≤| α |≤1；Generate the second scale parameter β, institute The second scale parameter β is stated as plural number.
17. terminal according to claim 16, which is characterized in that the information generates subelement, is further used for described Code word matrixWhen I is (i1, i2),The code word matrixIn I When for (i1, i2, i3),Wherein, the Func3, the Func4 are respectively indicated Function,The Kronecker product of representing matrix.
18. terminal according to claim 16, which is characterized in that the information generates subelement, is further used for described According to code word matrixGenerate the second class code book, each code word of the second class code book withIt is orthogonal.
19. terminal according to claim 18, which is characterized in that the information generates subelement, is further used for basis The code word matrixGenerate the second class code book, including by the first kind code book withOrthogonal code word is constituted Second class code book, the code word number that the second class code book includes are M, 0≤M≤N-1, wherein the N indicates the code of first kind code book Word number.
20. terminal according to claim 18, which is characterized in that the information generates subelement, is further used for basis The code word matrixThe second class code book is generated, including for givenBy code word Ws 2 all in code book C21、 W22、…、W2MIt projects toOrthogonal intersection space, obtain M projection code word, the M projection code word constitutes the second class code This；The code book C2, by code word W 21、W22、…、W2MIt constitutes.
21. terminal according to claim 20, which is characterized in that the information generates subelement, and being further used for will be in C2 Code word W 2kIt projects toOrthogonal intersection space indicate are as follows:E Indicate Nt×NtUnit matrix.
22. terminal according to claim 18, which is characterized in that the information generates subelement, is further used for basis The code word matrixGenerating the second class code book isSecondary series to it is last one column,It indicates by vectorThe householder transformation matrix of construction.
23. terminal according to claim 17, which is characterized in that the information generates subelement, is further used for basis The code word matrixThe code word in the second class code book generated hasWherein, A1The orthogonal and/or A with Func3 (i1)2It is orthogonal with Func4 (i2),The Kronecker product of representing matrix.
24. terminal according to claim 17, which is characterized in that the information generates subelement, is further used for basis The code word matrixThe code word in the second class code book generated hasIts In, A1The orthogonal and/or A with Func3 (i1, i2)2It is orthogonal with Func4 (i3),The Kronecker product of representing matrix.
25. a kind of base station for obtaining channel state information, which is characterized in that the base station includes:
Acquiring unit, for obtaining the channel state information of user equipment (UE) feedback, the channel state information includes code book rope Fuse breath, scale parameter, wherein
The codebook index information is first kind code book index I and the second class code book index J, and the scale parameter is the second ratio Parameter beta；
Alternatively,
The codebook index information is first kind code book index I and the second class code book index J, and the scale parameter is the first ratio Parameter alpha and the second scale parameter β；
The acquiring unit further comprises parsing subunit；
The parsing subunit, for parsing the first kind code book index I, the first kind code book index I include: i, Any one in (i1, i2), (i1, i2, i3), the i, the i1, the i2, the i3 are greater than the positive integer equal to 1； The parsing subunit is further used for the code word matrix that parsing obtains The calculated result of Func1 representative function, Func1 (I) is NT× υ matrix is the i-th code word of first kind code book；Func2 is indicated The calculated result of function, Func2 (J) is NT× υ matrix is the second class code generated according to the i-th code word of first kind code book This j-th code word, α, β are plural numbers, are scale parameter.
26. base station according to claim 25, which is characterized in that the parsing subunit is further used for parsing institute Stating the second class code book index J, the second class code book index J is j or (j1, j2), and the j, the j1, the j2 are greater than Positive integer equal to 1；Parsing the first scale parameter α, the first scale parameter α is plural number, 0≤| α |≤1；Parsing The second scale parameter β out, the second scale parameter β are plural number.
27. base station according to claim 26, which is characterized in that the parsing subunit is further used for basis and receives The UE send first kind code book index I and/or the second class code book index J, the first scale parameter α and/or the second ratio Parameter beta parses acquisition code word matrix by the way of inquiring preset code book table and combination calculating.
28. base station according to claim 27, which is characterized in that the acquiring unit further comprises:
Normalized subelement, for base station to the code word matrix of acquisitionDo normalized.
29. the base station according to claim 27 or 28, which is characterized in that the acquiring unit further comprises:
Dispatch subelement, for the base station reference obtain code word matrix UE is scheduled, select downlink transmission mode with UE is communicated；The downlink transmission mode includes single user MIMO transmission mode, multi-user's multiple-input and multiple-output Any one in transmission mode, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission mode.
CN201310317816.2A 2013-07-25 2013-07-25 Method, terminal and the base station for obtaining precoding of feeding back channel state information Expired - Fee Related CN104348590B (en)

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