CN104348590A - Method for feeding back channel state information, terminal thereof and base station for obtaining precoding - Google Patents

Abstract

The invention discloses a method for feeding back channel state information, a terminal for feeding back channel state information and a base station for obtaining channel state information. The method comprises that when user equipment UE feeds back channel state information to a base station, the channel state information comprises a codebook index information and a proportion parameter, the codebook index information comprises a first type codebook index I and/or a second codebook index J, and the proportion parameter comprises a first proportion parameter alpha and/or a second proportion parameter beta. The feedback unit of the terminal is used for feeding back the channel state information to the base station. The channel state information comprises the codebook index information and the proportion parameter. The codebook index information comprises the first type codebook index I and/or the second codebook index J, and the proportion parameter comprises the first proportion parameter alpha and/or the second proportion parameter beta. By employing the method, the terminal and the base station, the accuracy of feedback information is improved, and the feedback overhead can be saved.

Description

The method of feeding back channel state information, terminal and obtain the base station of precoding

Technical field

The present invention relates to the technology for information acquisition of digital communicating field, particularly relate to the base station of a kind of method of feeding back channel state information, the terminal of feeding back channel state information and acquisition channel condition information.

Background technology

At long evolving system (LTE, Long Term Evolution) in, its agreement is Release8 version, be called for short R8 version, the information (CSI, Channel State Information) of reflection down physical channel state has three kinds of forms: channel quality instruction (CQI, Channels quality indication), pre-coding matrix instruction (PMI, Pre-coding Matrix Indicator), order instruction (RI, Rank Indicator).

CQI is the index weighing down channel quality quality.In 36-213 agreement CQI with 0 ~ 15 integer value represent, represent different CQI grades respectively, different CQI correspond to respective modulation system and encoder bit rate (MCS), is divided into 16 kinds of situations, can adopts 4 bit informations to represent.

PMI refers to only under this emission mode of Closed-Loop Spatial Multiplexing, subscriber equipment (UE, User Equipment) tell enhanced base station (eNB according to the channel quality recorded, eNode B) which type of pre-coding matrix should be used to carry out precoding to Physical Downlink Shared Channel (PDSCH, the Physical Downlink Shared Channel) channel issuing this UE.The feedback granularity of PMI can be whole bandwidth feedback PMI, also can feed back PMI according to subband (subband).

RI for describing the number of space independent channel, the order of respective channels response matrix.Under Open-Loop Spatial Multiplexing and Closed-Loop Spatial Multiplexing pattern, need UE to feed back RI information, under other patterns, do not need feedback RI information.The sum of ranks number of plies of channel matrix is corresponding, and therefore namely UE is the number of plies of feeding back downlink transmission to base station feedback RI information.

Transport layer is the concept of multiple antennas in LTE and LTE-A " layer ", and the number of effective independent channel during representation space is multiplexing, with antenna port one_to_one corresponding in version 10, wherein in version 10, antenna port is logic port, and the sum of transport layer is exactly RI.In addition, in IEEE802.16m, layer is corresponding with " MIMO stream " concept, has identical physical meaning.

In LTE system, the feedback of CQI, PMI, RI can be periodic feedback, also can be acyclic feedback.CQI and PMI can send simultaneously, or CQI, PMI and RI send simultaneously.Wherein, for periodic feedback, if UE does not need to send data, the then CSI of periodic feedback row control channel (PUCCH physically, Physical Uplink Control Channel) on form 2 or 2a or 2b(PUCCH format2/2a/2b) transmission, if when UE needs to send data, then the CSI middle transmission of row shared channel (PUSCH, Physical Uplink Shared Channel) physically; For aperiodicity feedback, only transmit on PUSCH.

As the advanced long-term evolution system (LTE-A of the evolution standard of LTE, Long Term Evolution Advanced) need to support larger system bandwidth (reaching as high as 100MHz), and need the spectrum efficiency improving average spectral efficiency (ase) and Cell Edge User, its agreement is Release10 version, be called for short R10 version, for this reason, lte-a system introduces a lot of new technology: the high-order multiple-input and multiple-output (MIMO that (1) is descending, Multiple Input Multiple Output), descending maximum support 4 antenna transmission of LTE system, and the introducing of high-order mimo makes the transmission of descending maximum support 8 antenna of lte-a system, then the dimension of channel state matrix increases, (2) cooperative multipoint transmission (CoMP, Coordinated multiple point transmission), this technology is exactly the cooperation transmission utilizing multiple cell transmission antenna, and so UE may need the channel condition information feeding back multiple community.

Many antennas are used at transmitting terminal and eNB, the mode of spatial reuse can be taked to improve transmission rate, namely different data are launched in the different antennae position on the running time-frequency resource that transmitting terminal is identical, also many antennas are used at receiving terminal and UE, when single user, the resource of all antennas can all be distributed to same user, this transmission form is called single user multiple-input and multiple-output (SU-MIMO), in addition also can when multi-user by the Resourse Distribute of different antennae to different user, this transmission form is called multi-user's multiple-input and multiple-output (MU-MIMO).Under single transmission mode, eNB dynamically can select the transmission of descending SU-MIMO or the transmission of MU-MIMO according to the channel condition information of feedback, is referred to as SU/MU MIMO switching at runtime.

Nonetheless, along with the arrival in intelligence epoch, it is found that the MIMO technology of use 4 or 8 antennas has been not enough to meet the explosive growth of flow to the lifting of power system capacity.So a kind of novel multi-antenna technology is developed, namely based on the MIMO technology of extensive antenna, namely dozens or even hundreds of antenna (or oscillator) is placed in base station side, consider the size of antenna, and take up an area and install, generally these large-scale antennas are placed with plane or the form that is similar to plane in base station side, when placement becomes a planar array, such as 32 antennas (oscillator), horizontal positioned 8 vertical single-polarized antennas, vertical direction 4 row (shown in Fig. 1), the positive and negative 45 degree of intersection dual polarized antennas of horizontal positioned 8, vertical direction 4 row (shown in Fig. 2), 64 antennas, horizontal direction places 8 vertical single-polarized antennas, vertical direction is placed to 8 row (Fig. 3), 64 antennas, horizontal direction places 8 positive and negative 45 degree of dual polarized antennas, vertical direction is placed to 8 row (Fig. 4) for another example, in the horizontal direction the dual polarization of 8 intersections or single polarization are placed and become an arc-shaped or round shape, the equally spaced placement of vertical direction, formed the face of cylinder etc. (as shown in Figure 5).The benefit of placing extensive antenna (oscillator) in base station side is can simultaneously for (being such as simultaneously 8 users transmit data by the AF panel between user in lower level compared with multi-user services, i.e. multiuser MIMO technology: MU-MIMO), moreover, it can also overcome the homogenous frequency signal interference of adjacent base station in network, finally, due to the increase of number of antennas, the array gain increase that each serviced user is corresponding, improve serviced subscriber signal power, integrate, owing to promoting the signal power of multiple targeted customer and suppressing the interference of homogenous frequency signal simultaneously, so this MIMO technology based on extensive antenna significantly improves the capacity of each base station, namely the flow of overall network is improved, one of key technology becoming future wireless system.

But above-mentioned technology also exists self problem, the important prerequisite wanting to obtain above mentioned various gain and benefit is exactly: base station must obtain the wireless channel coefficient matrix information between base station and each user accurately.In FDD system, terminal utilizes channel condition information reference symbol (CSI-RS, Channel State Information-Reference Signal) measure channel coefficient matrix, then it quantification is become a code word in code book (CodeBook), code book refers to the set of predefined multiple matrix or vector, respectively preserve a identical copy with end side in base station, each matrix or vector are called a code word, then information corresponding for code word is fed back to base station by ascending control channel or shared channel, base station is terminal transmission data etc. based on this information.So the accuracy of the channel information of feedback depends on the design of code book completely, but need when design codebooks to consider the compromise between expense and performance, because expense during feedback is also the problem faced by real system.Consider the problem of feedback overhead for considering that the accuracy of the channel information fed back is compromised again, not yet there is effective solution at present.

Summary of the invention

In view of this, main purpose of the present invention is the base station providing a kind of method of feeding back channel state information, the terminal of feeding back channel state information and obtain channel condition information, has both promoted the accuracy of feedback information, and can save feedback overhead again.

For achieving the above object, technical scheme of the present invention is achieved in that

A method for feeding back channel state information, the method comprises:

User equipment (UE) is to base station feedback channel condition information, and described channel condition information comprises codebook index information, scale parameter;

Described codebook index information comprises: first kind code book index I and/or Equations of The Second Kind code book index J; Described scale parameter comprises: the first scale parameter α and/or the second scale parameter β.

Wherein, described first kind code book index I comprises: any one in i, (i1, i2), (i1 i2 i3); Described i, described i1, described i2, described i3 be more than or equal to 1 positive integer;

Described Equations of The Second Kind code book index J is j or (j1, j2); Described j, described j1, described j2 be more than or equal to 1 positive integer;

Described first scale parameter α is plural number, 0≤| α |≤1; Described second scale parameter β is plural number.

Wherein, the method also comprises:

Described UE obtains channel matrix H, determines the code word matrix in total number of plies information υ and the first codebook matrix according to H the index of its correspondence is first kind code book index I, and feeds back first kind code book index I, wherein, a N _tthe complex matrix of × υ;

Described UE is according to described code word matrix generate Equations of The Second Kind code book;

Described UE determines the code word matrix BMat in Equations of The Second Kind code book according to H _j, the index of its correspondence is Equations of The Second Kind code book index J, and feeds back Equations of The Second Kind code book index J, wherein, and BMat _ja N _tthe complex matrix of × υ.

Wherein, described code word matrix when I is (i1, i2),

Described code word matrix when I is (i1 i2 i3), ${\mathrm{AMat}}_I^v=\mathrm{Func}3(i1,i2)\⊗\mathrm{Func}4\left(i3\right);$

Wherein, described Func3, described Func4 be representative function respectively, described in the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Wherein, according to described code word matrix generate Equations of The Second Kind code book, each code word of described Equations of The Second Kind code book with orthogonal.

Wherein, according to described code word matrix generate Equations of The Second Kind code book, comprise by described first kind code book with orthogonal code word forms Equations of The Second Kind code book, and the code word number that Equations of The Second Kind code book comprises is M, 0≤M≤N-1, and wherein, described N represents the code word number of first kind code book.

Wherein, according to described code word matrix generate Equations of The Second Kind code book, comprise for given by code word W 2 all in code book C2 ₁, W2 ₂..., W2 _mproject to orthogonal intersection space, obtain M projection code word, described M projection code word formation Equations of The Second Kind code book; Described code book C2, by code word W 2 ₁, W2 ₂..., W2 _mform.

Wherein, by the code word W 2 in C2 _kproject to orthogonal intersection space be expressed as: ${\mathrm{BMat}}_k=(E-{\mathrm{AMat}}_I^v{\left({\left(\mathrm{AMa}{t}_I^v\right)}^H{\mathrm{AMat}}_I^v\right)}^{-1}\·{\left(\mathrm{AMa}{t}_I^v\right)}^H)\·{W2}_k,$ K=1 ..., M, E represent N _t× N _tunit matrix.

Wherein, according to described code word matrix generating Equations of The Second Kind code book is secondary series to last row, k=1 ..., M, represent by vector the householder transformation matrix of structure.

Wherein, according to described code word matrix code word in the Equations of The Second Kind code book generated has structure wherein, A ₁and/or A orthogonal with Func3 (i1) ₂it is orthogonal with Func4 (i2), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Wherein, according to described code word matrix code word in the Equations of The Second Kind code book generated has wherein, A ₁orthogonal and/or the A with Func3 (i1, i2) ₂it is orthogonal with Func4 (i3), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Wherein, the method also comprises: described base station is according to the first kind code book index I of the described UE transmission received and/or Equations of The Second Kind code book index J, the first scale parameter α and/or the second scale parameter β, and the code book table adopting inquiry the to preset mode that also combination calculates obtains code word matrix.

Wherein, the code word matrix of described base station acquisition func1 representative function, the result of calculation of Func1 (I) is N _t× υ matrix is I code word of first kind code book; Func2 representative function, the result of calculation of Func2 (J) is N _t× υ matrix, be J code word of the Equations of The Second Kind code book of I the code word generation according to first kind code book, α, β are plural numbers, are scale parameter.

Wherein, the method also comprises: described base station is to the code word matrix obtained do normalized.

Wherein, the method also comprises: the code word matrix that described base station reference obtains is dispatched UE, selects downlink transmission mode to communicate with UE;

Described downlink transmission mode comprise in single user MIMO transmission pattern, Multi-user mimo transmissions pattern, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission pattern any one.

A terminal for feeding back channel state information, described terminal comprises:

Feedback unit, for base station feedback channel condition information, described channel condition information comprises codebook index information, scale parameter; Wherein, described codebook index information comprises: first kind code book index I and/or Equations of The Second Kind code book index J; Described scale parameter comprises: the first scale parameter α and/or the second scale parameter β.

Wherein, described feedback unit comprises further:

Information generates subelement, and for generating described first kind code book index I, described first kind code book index I comprises: any one in i, (i1, i2), (i1 i2 i3); Described i, described i1, described i2, described i3 be more than or equal to 1 positive integer; Generate described Equations of The Second Kind code book index J, described Equations of The Second Kind code book index J is j or (j1, j2); Described j, described j1, described j2 be more than or equal to 1 positive integer; Generate described first scale parameter α, described first scale parameter α is plural number, 0≤| α |≤1; Generate described second scale parameter β, described second scale parameter β is plural number.

Wherein, described information generates subelement, is further used for obtaining channel matrix H by UE, determines the code word matrix in total number of plies information υ and the first codebook matrix according to H the index of its correspondence is first kind code book index I, and feeds back first kind code book index I, wherein, a N _tthe complex matrix of × υ; Described UE is according to described code word matrix generate Equations of The Second Kind code book; Described UE determines the code word matrix BMat in Equations of The Second Kind code book according to H _j, the index of its correspondence is Equations of The Second Kind code book index J, and feeds back Equations of The Second Kind code book index J, wherein, and BMat _ja N _tthe complex matrix of × υ.

Wherein, described information generates subelement, is further used for described code word matrix when I is (i1, i2), described code word matrix when I is (i1 i2 i3), wherein, described Func3, described Func4 be representative function respectively, described in the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Wherein, described information generates subelement, is further used for described according to code word matrix generate Equations of The Second Kind code book, each code word of described Equations of The Second Kind code book with orthogonal.

Wherein, described information generates subelement, is further used for according to described code word matrix generate Equations of The Second Kind code book, comprise by described first kind code book with orthogonal code word forms Equations of The Second Kind code book, and the code word number that Equations of The Second Kind code book comprises is M, 0≤M≤N-1, and wherein, described N represents the code word number of first kind code book.

Wherein, described information generates subelement, is further used for according to described code word matrix generate Equations of The Second Kind code book, comprise for given by code word W 2 all in code book C2 ₁, W2 ₂..., W2 _mproject to orthogonal intersection space, obtain M projection code word, described M projection code word formation Equations of The Second Kind code book; Described code book C2, by code word W 2 ₁, W2 ₂..., W2 _mform.

Wherein, described information generates subelement, is further used for the code word W 2 in C2 _kproject to orthogonal intersection space be expressed as: ${\mathrm{BMat}}_k=(E-{\mathrm{AMat}}_I^v{\left({\left(\mathrm{AMa}{t}_I^v\right)}^H{\mathrm{AMat}}_I^v\right)}^{-1}\·{\left(\mathrm{AMa}{t}_I^v\right)}^H)\·{W2}_k,$ K=1 ..., M, E represent N _t× N _tunit matrix.

Wherein, described information generates subelement, is further used for according to described code word matrix generating Equations of The Second Kind code book is secondary series to last row, k=1 ..., M, represent by vector the householder transformation matrix of structure.

Wherein, described information generates subelement, is further used for according to described code word matrix code word in the Equations of The Second Kind code book generated has wherein, A ₁and/or A orthogonal with Func3 (i1) ₂it is orthogonal with Func4 (i2), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Wherein, described information generates subelement, is further used for according to described code word matrix code word in the Equations of The Second Kind code book generated has wherein, A ₁orthogonal and/or the A with Func3 (i1, i2) ₂it is orthogonal with Func4 (i3), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Obtain a base station for channel condition information, described base station comprises:

Acquiring unit, for obtaining the channel condition information of user equipment (UE) feedback, described channel condition information comprises codebook index information, scale parameter; Wherein, described codebook index information comprises: first kind code book index I and/or Equations of The Second Kind code book index J; Described scale parameter comprises: the first scale parameter α and/or the second scale parameter β.

Wherein, described acquiring unit, comprises further:

Resolve subelement, for parsing described first kind code book index I, described first kind code book index I comprises: any one in i, (i1, i2), (i1 i2 i3); Described i, described i1, described i2, described i3 be more than or equal to 1 positive integer; Parse described Equations of The Second Kind code book index J, described Equations of The Second Kind code book index J is j or (j1, j2); Described j, described j1, described j2 be more than or equal to 1 positive integer; Parse described first scale parameter α, described first scale parameter α is plural number, 0≤| α |≤1; Parse described second scale parameter β, described second scale parameter β is plural number.

Wherein, described parsing subelement, be further used for the first kind code book index I according to the described UE transmission received and/or Equations of The Second Kind code book index J, the first scale parameter α and/or the second scale parameter β, default code book table is inquired about in employing and the mode of combination calculating resolves acquisition code word matrix.

Wherein, described parsing subelement, is further used for resolving the code word matrix obtained func1 representative function, the result of calculation of Func1 (I) is N _t× υ matrix is I code word of first kind code book; Func2 representative function, the result of calculation of Func2 (J) is N _t× υ matrix, be J code word of the Equations of The Second Kind code book of I the code word generation according to first kind code book, α, β are plural numbers, are scale parameter.

Wherein, described acquiring unit, comprises further:

Normalized subelement, for base station to the code word matrix obtained do normalized.

Wherein, described acquiring unit, comprises further:

Scheduling sublayer unit, the code word matrix obtained for described base station reference is dispatched UE, selects downlink transmission mode to communicate with UE; Described downlink transmission mode comprise in single user MIMO transmission pattern, Multi-user mimo transmissions pattern, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission pattern any one.

Method of the present invention is: UE is to base station feedback channel condition information, and described channel condition information comprises codebook index information, scale parameter; Described codebook index information comprises: first kind code book index I and/or Equations of The Second Kind code book index J; Described scale parameter comprises: the first scale parameter α and/or the second scale parameter β.Adopt the present invention, both promoted the accuracy of feedback information, and can feedback overhead have been saved again.

Accompanying drawing explanation

Fig. 1 is the planar antenna array figure of 32 vertical single-polarized antenna formations that 4 row 8 arrange;

Fig. 2 is the planar antenna array figure of 32 positive and negative 45 ° of dual polarized antennas formations that 4 row 4 arrange;

Fig. 3 is the planar antenna array figure of 64 vertical single-polarized antenna formations that 8 row 8 arrange;

Fig. 4 is the planar antenna array figure of 64 positive and negative 45 ° of dual polarized antennas formations that 8 row 4 arrange;

Fig. 5 is the 32 antenna non-planar antennas array of figure based on vertical polarized antenna;

Fig. 6 is the realization flow schematic diagram of the inventive method embodiment.

Embodiment

Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme.

Accuracy due to channel information depends on the design of code book completely, and when design codebooks, need to consider the compromise between expense and performance, because expense is also the problem faced by real system, especially for extensive these large-scale antenna array of MIMO and 3D mimo system, the dimension of its channel coefficient matrix is very large, now want to quantize these coefficient matrixes more accurately, its expense is very large, therefore, the scheme of the acquisition channel condition information that the present invention proposes, codebook construction during codebook design and feedback are processed, thus the accuracy of feedback information can be promoted, feedback overhead can be saved again.

Specifically, for support 3D wave beam forming and/or extensive Massive MIMO transmission pattern, need on the one hand to keep backwards compatibility, to support that the MIMO/COMP of each version of R8 ~ R11 is for priority principle, the feedback form of the CQI/PMI/RI of compatible R8 ~ R11 as far as possible, on the other hand, needs to consider forward compatibility, consider the support to 3D wave beam forming and/or extensive Massive MIMO, ensure that new technology has acceptable performance.And the precision comparison of existing state information feedback method PMI is low, causes the down channel that the selection that base station cannot be correct uses when UE sends data, and then cause the MU-MIMO system of new transmission method not reach rational performance.In order to support the downlink transfer of 3D wave beam forming and/or extensive Massive MIMO, the scheme of acquisition channel condition information provided by the invention, by obtaining a kind of form of the information of channel status, namely pre-coding matrix instruction realizes the accuracy and the saving feedback overhead that promote feedback information, in the present invention, pre-coding matrix instruction is specially pre-coding matrix index, adopt the present invention can compatible SU-MIMO and MU-MIMO, and the systematic function of 3D wave beam forming and/or extensive Massive MIMO can be ensured, be specially adapted to extensive MIMO and 3D mimo system.

The present invention mainly comprises following content:

A method for feeding back channel state information, comprising:

UE is to base station feedback channel condition information, and described channel condition information comprises codebook index information, scale parameter, so as UE by codebook index information, scale parameter and total number of plies information feed back to base station as eNB, the channel condition information of indicating downlink.Wherein, described codebook index information comprises: first kind code book index I and Equations of The Second Kind code book index J; Described scale parameter comprises: the first scale parameter α and/or the second scale parameter β.

Further, first kind code book index I comprises one of following: i, (i1, i2), (i1 i2 i3), wherein, i, i1, i2, i3 be more than or equal to 1 positive integer;

Equations of The Second Kind code book index J is j or (j1, j2), wherein, j, j1, j2 be more than or equal to 1 positive integer;

First scale parameter α is plural number, 0≤| α |≤1, preferred value is 1; Second scale parameter β is plural number.

Further, the method also comprises: described UE obtains channel matrix H, determines the code word matrix in total number of plies information υ and the first codebook matrix according to H the index of its correspondence is first kind code book index I, and feeds back first kind code book index I, wherein, a N _tthe complex matrix of × υ;

Described UE is according to described code word matrix generate Equations of The Second Kind code book;

Described UE determines the code word matrix BMat in Equations of The Second Kind code book according to H _j, the index of its correspondence is Equations of The Second Kind code book index J, and feeds back Equations of The Second Kind code book index J, wherein, and BMat _ja N _tthe complex matrix of × υ.

Further, code word matrix when I is (i1, i2), there is feature for time (i1 i2 i3), there is feature at I wherein, Func3, Func4 be representative function respectively, the Kronecker product (keroneck product) of representing matrix or with other mathematic calculation of Kronecker product equivalence or implementation.

Further, according to described code word matrix generate Equations of The Second Kind code book, each code word of described Equations of The Second Kind code book with orthogonal.

Further, according to described code word matrix generate Equations of The Second Kind code book, comprise by described first kind code book with orthogonal code word forms Equations of The Second Kind code book, and the code word number that Equations of The Second Kind code book comprises is M, 0≤M≤N-1, and wherein, described N represents the code word number of first kind code book.

Further, according to described code word matrix generate Equations of The Second Kind code book, comprise for given by code word W 2 all in code book C2 ₁, W2 ₂..., W2 _mproject to orthogonal intersection space, obtain M projection code word, described M projection code word formation Equations of The Second Kind code book; Described code book C2, by code word W 2 ₁, W2 ₂..., W2 _mform.

Further, by the code word W 2 in C2 _kproject to orthogonal intersection space be expressed as: ${\mathrm{BMat}}_k=(E-{\mathrm{AMat}}_I^v{\left({\left(\mathrm{AMa}{t}_I^v\right)}^H{\mathrm{AMat}}_I^v\right)}^{-1}\·{\left(\mathrm{AMa}{t}_I^v\right)}^H)\·{W2}_k,$ K=1 ..., M, E represent N _t× N _tunit matrix.Described W2 _kin k=1 ...., M, described W2 _krepresent all code word W 2 in code book C2 above ₁, W2 ₂..., W2 _m.

Further, according to described code word matrix generating Equations of The Second Kind code book is secondary series to last row, k=1 ..., M, represent by vector the householder transformation matrix of structure.

Further, according to described code word matrix code word in the Equations of The Second Kind code book generated has feature wherein, A ₁and/or A orthogonal with Func3 (i1) ₂it is orthogonal with Func4 (i2), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Further, according to described code word matrix code word in the Equations of The Second Kind code book generated has feature wherein, A ₁orthogonal and/or the A with Func3 (i1, i2) ₂it is orthogonal with Func4 (i3), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Further, the method also comprises: described base station receives codebook index information I and J, scale parameter α, β of UE transmission, obtains code word matrix according to the code book table mode that also combination calculates that described information adopts inquiry to preset.

Further, described code word matrix, is characterized in that, func1 representative function, the result of calculation of Func1 (I) is N _t× υ matrix is I code word of first kind code book.Func2 representative function, the result of calculation of Func2 (J) is N _t× υ matrix, be J code word of the Equations of The Second Kind code book of I the code word generation according to first kind code book, 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) ^hrepresent the complex conjugate of Func1 (I), described multiplication is Matrix Multiplication.

Further, described base station is to code word matrix do normalized.

Further, the code word that described base station reference obtains is dispatched UE, select downlink transmission mode to communicate with UE, described downlink transmission mode comprises following one: single user MIMO transmission pattern, Multi-user mimo transmissions pattern, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission pattern.

A terminal for feeding back channel state information, the description of specific implementation describes consistent with said method, comprises feedback unit, and for described UE to base station feedback channel condition information, described channel condition information comprises codebook index information, scale parameter; Wherein, described codebook index information comprises: first kind code book index I and/or Equations of The Second Kind code book index J; Described scale parameter comprises: the first scale parameter α and/or the second scale parameter β.

Described feedback unit comprises further:

Information generates subelement, and for generating described first kind code book index I, described first kind code book index I comprises: any one in i, (i1, i2), (i1 i2 i3); Described i, described i1, described i2, described i3 be more than or equal to 1 positive integer; Generate described Equations of The Second Kind code book index J, described Equations of The Second Kind code book index J is j or (j1, j2); Described j, described j1, described j2 be more than or equal to 1 positive integer; Generate described first scale parameter α, described first scale parameter α is plural number, 0≤| α |≤1, preferred value is 1; Generate described second scale parameter β, described second scale parameter β is plural number.

Described information generates subelement, is further used for obtaining channel matrix H by UE, determines the code word matrix in total number of plies information υ and the first codebook matrix according to H the index of its correspondence is first kind code book index I, and feeds back first kind code book index I, wherein, a N _tthe complex matrix of × υ; Described UE is according to described code word matrix generate Equations of The Second Kind code book; Described UE determines the code word matrix BMat in Equations of The Second Kind code book according to H _j, the index of its correspondence is Equations of The Second Kind code book index J, and feeds back Equations of The Second Kind code book index J, wherein, and BMat _ja N _tthe complex matrix of × υ.

Described information generates subelement, is further used for described code word matrix when I is (i1, i2), described code word matrix when I is (i1 i2 i3), wherein, described Func3, described Func4 be representative function respectively, described in the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Described information generates subelement, is further used for described according to code word matrix generate Equations of The Second Kind code book, each code word of described Equations of The Second Kind code book with orthogonal.

Described information generates subelement, is further used for according to described code word matrix generate Equations of The Second Kind code book, comprise by described first kind code book with orthogonal code word forms Equations of The Second Kind code book, and the code word number that Equations of The Second Kind code book comprises is M, 0≤M≤N-1, and wherein, described N represents the code word number of first kind code book.

Described information generates subelement, is further used for according to described code word matrix generate Equations of The Second Kind code book, comprise for given by code word W 2 all in code book C2 ₁, W2 ₂..., W2 _mproject to orthogonal intersection space, obtain M projection code word, described M projection code word formation Equations of The Second Kind code book; Described code book C2, by code word W 2 ₁, W2 ₂..., W2 _mform.

Described information generates subelement, is further used for the code word W 2 in C2 _kproject to orthogonal intersection space be expressed as: ${\mathrm{BMat}}_k=(E-{\mathrm{AMat}}_I^v{\left({\left(\mathrm{AMa}{t}_I^v\right)}^H{\mathrm{AMat}}_I^v\right)}^{-1}\·{\left(\mathrm{AMa}{t}_I^v\right)}^H)\·{W2}_k,$ K=1 ..., M, E represent N _t× N _tunit matrix.Described W2 _kin k=1 ...., M, described W2 _krepresent all code word W 2 in code book C2 above ₁, W2 ₂..., W2 _m.

Described information generates subelement, is further used for according to described code word matrix generating Equations of The Second Kind code book is secondary series to last row, k=1 ..., M, represent by vector the householder transformation matrix of structure.

Described information generates subelement, is further used for according to described code word matrix code word in the Equations of The Second Kind code book generated has wherein, A ₁and/or A orthogonal with Func3 (i1) ₂it is orthogonal with Func4 (i2), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Described information generates subelement, is further used for according to described code word matrix code word in the Equations of The Second Kind code book generated has wherein, A ₁orthogonal and/or the A with Func3 (i1, i2) ₂it is orthogonal with Func4 (i3), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

Obtain a base station eNodeB for channel condition information, the description of specific implementation describes consistent with said method, comprising: acquiring unit, and for obtaining the channel condition information of UE feedback, described channel condition information comprises codebook index information, scale parameter; Wherein, described codebook index information comprises: first kind code book index I and/or Equations of The Second Kind code book index J; Described scale parameter comprises: the first scale parameter α and/or the second scale parameter β.

Described acquiring unit, comprises further:

Resolve subelement, for parsing described first kind code book index I, described first kind code book index I comprises: any one in i, (i1, i2), (i1 i2 i3); Described i, described i1, described i2, described i3 be more than or equal to 1 positive integer; Parse described Equations of The Second Kind code book index J, described Equations of The Second Kind code book index J is j or (j1, j2); Described j, described j1, described j2 be more than or equal to 1 positive integer; Parse described first scale parameter α, described first scale parameter α is plural number, 0≤| α |≤1, preferred value is 1; Second scale parameter β is plural number.

Described parsing subelement, be further used for the first kind code book index I according to the described UE transmission received and/or Equations of The Second Kind code book index J, the first scale parameter α and/or the second scale parameter β, default code book table is inquired about in employing and the mode of combination calculating resolves acquisition code word matrix.

Described parsing subelement, is further used for resolving the code word matrix obtained func1 representative function, the result of calculation of Func1 (I) is N _t× υ matrix is I code word of first kind code book; Func2 representative function, the result of calculation of Func2 (J) is N _t× υ matrix, be J code word of the Equations of The Second Kind code book of I the code word generation according to first kind code book, α, β are plural numbers, are scale parameter.

Described acquiring unit, comprises further:

Normalized subelement, for base station to the code word matrix obtained do normalized.

Described acquiring unit, comprises further:

Scheduling sublayer unit, the code word matrix obtained for described base station reference is dispatched UE, selects downlink transmission mode to communicate with UE; Described downlink transmission mode comprise in single user MIMO transmission pattern, Multi-user mimo transmissions pattern, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission pattern any one.

In sum, adopt the solution of the present invention, when subscriber equipment is to network side feeding back channel state information, the index information of described code book is carried in this information, the channel condition information of indicating downlink, like this, on the one hand network side can the compatible channel condition information form using R10 version, realize the multiple antennas function before R10 version, such as Single User MIMO; On the other hand, network side significantly reduces quantization error by Equations of The Second Kind code book index, thus significantly strengthens the performance of 3D wave beam forming or extensive Massive mimo system.Generated and method for expressing by new code book, efficiency of transmission and transmission quality can be improved, solve MU-MIMO in new transmission means and lack the problem of accurate channel condition information.

Below the present invention is illustrated description.

In order to obtain higher peaks spectrum efficiency, after LTE-A R11 in system, the descending transmission needing support 3 to tie up wave beam forming and/or extensive Massive MIMO, on the one hand, the feedback control signaling of channel information needs to keep backwards compatibility, to support that SU-MIMO is for priority principle, the feedback form of the CQI/PMI/RI before compatible as far as possible existing R11; On the other hand, the feeding back channel state information of channel information needs to consider forward compatibility, need to redesign new R12 or code book afterwards, improve feedback accuracy, thus the better support of wave beam formings and/or extensive Massive MIMO is tieed up to 3, ensure that new technology has acceptable performance.

Embodiment 1

In the present embodiment, if first kind code book index I is (i1, i2), then UE also can indicate a complex matrix by the first kind code book table preset as search index by I and total number of plies υ func3 and Func4 show respectively function, the Kronecker product (keroneck product) of representing matrix or other mathematic calculation, implementation with Kronecker product equivalence.

In the present embodiment, the example that more concrete is had.If base station side is configured with 8 × N ₂root antenna port, the arrangement (as shown in Figure 1,64 antennas as shown in Figure 3 for 32 antennas) of antenna or oscillator, in horizontal direction, every a line has 8 antennas, total total N in vertical direction ₂oK, now N is had ₁=8, usually N ₂value can be 2,4,6,8,10,12,16.

Being provided with 128 length is the vector codeword of 8 i1=1 ..., 128, be provided with 2N in addition ₂individual vector codeword i2=1 ..., (2N ₂), wherein form be $C_{1,i2}^{N_2}=\frac{1}{\sqrt{N_2}}{\left[\begin{array}{ccccc}1& e^{{\mathrm{j\θ}}_{i2}}& e^{{j2\mathrm{\θ}}_{i2}}& \·\·\·& e^{j(N_2-1){\mathrm{\θ}}_{i2}}\end{array}\right]}^T,i2=1,\·\·\·,\left({2N}_2\right),$ Here we can get ${\mathrm{\θ}}_{i2}=\frac{2\mathrm{\π}(i2-1)}{2N_2}.$

Other system of selection can certainly be had, such as non-uniform quantizing angle etc.Then first kind code book Φ ₁altogether comprise N=128*2*N ₂individual code word, wherein the generation method of kth=8 (i1-1)+i2 code word is here represent that kronencker amasss, can certainly be write as other forms, but as long as complete identical function.Wherein, k is the index of first kind code word.

Equations of The Second Kind code word can obtain in the following manner.

For all with orthogonal code word forms Equations of The Second Kind code book BMat, and BMat comprises M code word.Wherein for the corresponding Equations of The Second Kind code book of each concrete I, I=1,2 ..., N, wherein, N represents that I can the sum of value.

UE according to down channel matrix H, in Equations of The Second Kind code book BMat select one need feedback code book index J, its correspond to by j code word BMat of the Equations of The Second Kind code book of structure _j, J=1,2 ..., M.

It is pointed out that the number of antennas N of the present embodiment horizontal direction ₁also can get the form of 2,4, in corresponding LTE R8, number of antennas is the code book of 1 layer of 2 and 4 respectively.Also can get other situation being greater than the integer of 1, not enumerate here.

It is important to note that Equations of The Second Kind code book code word value and first kind code book code word value are not limited to described example.

Embodiment 2

In the present embodiment, if first kind code book index I is (i1, i2), then UE also can indicate a complex matrix by the first kind code book table preset as search index by I and total number of plies υ func3 and Func4 show respectively function, the Kronecker product (keroneck product) of representing matrix or other mathematic calculation, implementation with Kronecker product equivalence.

In the present embodiment, the example that more concrete is had.If base station side is configured with 8 × N ₂root antenna port, the arrangement (as shown in Figure 1,64 antennas as shown in Figure 3 for 32 antennas) of antenna or oscillator, in horizontal direction, every a line has 8 antennas, total total N in vertical direction ₂oK, now N is had ₁=8, usually N ₂value can be 2,4,6,8,10,12,16.

Being provided with 128 length is the vector codeword of 8 i1=1 ..., 128, be provided with 2N in addition ₂individual vector codeword i2=1 ..., (2N ₂), wherein form be $C_{1,i2}^{N_2}=\frac{1}{\sqrt{N_2}}{\left[\begin{array}{ccccc}1& e^{{\mathrm{j\θ}}_{i2}}& e^{{j2\mathrm{\θ}}_{i2}}& \·\·\·& e^{j(N_2-1){\mathrm{\θ}}_{i2}}\end{array}\right]}^T,i2=1,\·\·\·,\left({2N}_2\right),$ Here we can get ${\mathrm{\θ}}_{i2}=\frac{2\mathrm{\π}(i2-1)}{2N_2}.$

Other system of selection can certainly be had, such as non-uniform quantizing angle etc.Then first kind code book Φ ₁altogether comprise N=128*2*N ₂individual code word, wherein the generation method of kth=8 (i1-1)+i2 code word is here represent that kronencker amasss, can certainly be write as other forms, but as long as complete identical function.Wherein, k is the index of first kind code word.

Equations of The Second Kind code word can obtain in the following manner.

For given by code word W 2 all in code book C2 ₁, W2 ₂..., W2 _mproject to orthogonal intersection space, obtain M projection code word, described M projection code word formation Equations of The Second Kind code book; Described code book C2, by code word W 2 ₁, W2 ₂..., W2 _mform; Wherein, the code word W 2 in C2 _karrive the rectangular projection of complementary space can be expressed as: ${\mathrm{BMat}}_k=(E-{\mathrm{AMat}}_I^v{\left({\left(\mathrm{AMa}{t}_I^v\right)}^H{\mathrm{AMat}}_I^v\right)}^{-1}\·{\left(\mathrm{AMa}{t}_I^v\right)}^H)\·{W2}_k,$ K=1 ..., M, E represent N _t× N _tunit matrix.。

Code book C2, by code word W 2 ₁, W2 ₂..., W2 _mform.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 in Equations of The Second Kind code book, search needs the Equations of The Second Kind codewords indexes J of feedback, corresponding to J code word BMat in Equations of The Second Kind code book _j.

It is pointed out that the number of antennas N of the present embodiment horizontal direction ₁also can get the form of 2,4, in corresponding LTE R8, number of antennas is the code book of 1 layer of 2 and 4 respectively.Also can get other situation being greater than the integer of 1, not enumerate here.

It is important to note that Equations of The Second Kind code book code word value and first kind code book code word value are not limited to described example.

Embodiment 3

In the present embodiment, if first kind code book index I is (i1, i2), then UE also can indicate a complex matrix by first kind code book table I and total number of plies υ=1 preset as search index func3 and Func4 show respectively function, the Kronecker product (keroneck product) of representing matrix or other mathematic calculation, implementation with Kronecker product equivalence.

In the present embodiment, the example that more concrete is had.If base station side is configured with N _t=8 × N ₂root antenna port, the arrangement (as shown in Figure 1,64 antennas as shown in Figure 3 for 32 antennas) of antenna or oscillator, in horizontal direction, every a line has 8 antennas, total total N in vertical direction ₂oK, now N is had ₁=8, usually N ₂value can be 2,4,6,8,10,12,16.

Being provided with 128 length is the vector codeword of 8 i1=1 ..., 128, be provided with 2N in addition ₂individual vector codeword $\mathrm{Func}4\left(i2\right)=C_{1,i2}^{N_2},i2=1,\·\·\·,\left({2N}_2\right),$ Wherein form be $C_{1,i2}^{N_2}=\frac{1}{\sqrt{N_2}}{\left[\begin{array}{ccccc}1& e^{{\mathrm{j\θ}}_{i2}}& e^{{j2\mathrm{\θ}}_{i2}}& \·\·\·& e^{j(N_2-1){\mathrm{\θ}}_{i2}}\end{array}\right]}^T,i2=1,\·\·\·,\left({2N}_2\right),$ Here we can get ${\mathrm{\θ}}_{i2}=\frac{2\mathrm{\π}(i2-1)}{2N_2}.$

Other system of selection can certainly be had, such as non-uniform quantizing angle etc.Then first kind code book Φ ₁altogether comprise N=128*2*N ₂individual code word, wherein the generation method of kth=8 (i1-1)+i2 code word is here represent that kronencker amasss, can certainly be write as other forms, but as long as complete identical function.Wherein, k is the index of first kind code word.

Equations of The Second Kind code word can obtain in the following manner.

For given structure householder transformation matrix, its method is as follows:

If first element be real number, then generate vector

If first element be plural number, then make c is utilized to generate intermediate variable finally generate vector v=d-e ₁, wherein e ₁=[1 0 ... 0] ^tbe first element be 1, other elements are all 0, and length is N _tcolumn vector;

Utilize Householder to convert and obtain matrix H:

$H=I_{N_t}-\frac{2{\mathrm{vv}}^H}{v^{H}v}$

Wherein n _t× N _tunit matrix.

UE is according to down channel matrix, and in Equations of The Second Kind code book, search needs the Equations of The Second Kind codewords indexes J of feedback, corresponding to J code word BMat in Equations of The Second Kind code book _j.

It is pointed out that the number of antennas N of the present embodiment horizontal direction ₁also can get the form of 2,4, in corresponding LTE R8, number of antennas is the code book of 1 layer of 2 and 4 respectively.Also can get other situation being greater than the integer of 1, not enumerate here.

It is important to note that Equations of The Second Kind code book code word value and first kind code book code word value are not limited to described example.

Embodiment 4

In the present embodiment, if first kind code book index I is (i1, i2), then UE also can indicate a complex matrix by the first kind code book table preset as search index by I and total number of plies υ func3 and Func4 show respectively function, the Kronecker product (keroneck product) of representing matrix or other mathematic calculation, implementation with Kronecker product equivalence.

In the present embodiment, the example that more concrete is had.If base station side is configured with 8 × N ₂root antenna port, the arrangement (as shown in Figure 1,64 antennas as shown in Figure 3 for 32 antennas) of antenna or oscillator, in horizontal direction, every a line has 8 antennas, total total N in vertical direction ₂oK, now N is had ₁=8, usually N ₂value can be 2,4,6,8,10,12,16.

Being provided with 128 length is the vector codeword of 8 i1=1 ..., 128, be provided with 2N in addition ₂individual vector codeword i2=1 ..., (2N ₂), wherein form be $C_{1,i2}^{N_2}=\frac{1}{\sqrt{N_2}}{\left[\begin{array}{ccccc}1& e^{{\mathrm{j\θ}}_{i2}}& e^{{j2\mathrm{\θ}}_{i2}}& \·\·\·& e^{j(N_2-1){\mathrm{\θ}}_{i2}}\end{array}\right]}^T,i2=1,\·\·\·,\left({2N}_2\right),$ Here we can get ${\mathrm{\θ}}_{i2}=\frac{2\mathrm{\π}(i2-1)}{2N_2}.$

Other system of selection can certainly be had, such as non-uniform quantizing angle etc.Then first kind code book Φ ₁altogether comprise N=128*2*N ₂individual code word, wherein the generation method of kth=8 (i1-1)+i2 code word is here represent that kronencker amasss, can certainly be write as other forms, but as long as complete identical function.Wherein, k is the index of first kind code word.

Given first kind code book index I (i1, i2) and total number of plies υ can determine the Equations of The Second Kind code book generated in advance, and Equations of The Second Kind code book is by it is characterized by $\mathrm{Func}5(i1,k1)\⊗\mathrm{func}4\left(k2\right)$ And/or $\mathrm{Func}3\left(k3\right)\⊗\mathrm{func}6(i2,k2)$ Code word form, wherein, Func5 (i1, k1) be and the orthogonal code book C of Func3 (i1) _i1middle index is the code word of k1, C _i1for length is the unit vector of 8; The code book C that Func6 (i2, k2) is and Func4 (i2) is orthogonal _i2middle index is the code word of k2, C _i2for length is N ₂unit vector.Here, Func3, Func4, Func5 and Func6 show respectively function, the Kronecker product (keroneck product) of representing matrix or other mathematic calculation, implementation with Kronecker product equivalence.

UE according to channel information, at C _i1middle search needs the code book index j1 of feedback, and the code word of its correspondence is C _i1(j1), at C _i2middle search needs the code book index j2 of feedback, and the code word of its correspondence is C _i2(j2), and feed back J to described base station, the form of J is (j1, j2).

It is pointed out that the number of antennas N of the present embodiment horizontal direction ₁also can get the form of 2,4, in corresponding LTE R8, number of antennas is the code book of 1 layer of 2 and 4 respectively.Also can get other situation being greater than the integer of 1, not enumerate here.

It is important to note that Equations of The Second Kind code book code word value and first kind code book code word value are not limited to described example.

Embodiment 5

In the present embodiment, if first kind code book index I is (i1, i2, i3), then UE also can indicate a complex matrix by the first kind code book table preset as search index by I and total number of plies υ func3 and Func4 show respectively function, the Kronecker product (keroneck product) of representing matrix or other mathematic calculation, implementation with Kronecker product equivalence.

In the present embodiment, the example that more concrete is had.If base station side is configured with 8 × N ₂root antenna port, the arrangement (as shown in Figure 2,64 antennas as shown in Figure 4 for 32 antennas) of antenna or oscillator, in horizontal direction, every a line has 8 antennas, is dual polarized antenna, total total N in vertical direction ₂oK, now N is had ₁=8, usually N ₂value can be 2,4,6,8,10,12,16.

Being provided with 128 length is the vector codeword of 8 i=1 ..., 128, wherein i represents i-th kind of value in 128 kinds of values of i1 and i2, is provided with 2N in addition ₂individual vector codeword $\mathrm{Func}4\left(i3\right)=C_{1,i3}^{N_2},i3=1,\·\·\·,\left({2N}_2\right),$ Wherein form be $C_{1,i3}^{N_2}=\frac{1}{\sqrt{N_2}}{\left[\begin{array}{ccccc}1& e^{{\mathrm{j\θ}}_{i3}}& e^{{j2\mathrm{\θ}}_{i3}}& \·\·\·& e^{j(N_2-1){\mathrm{\θ}}_{i3}}\end{array}\right]}^T,i3=1,\·\·\·,\left({2N}_2\right),$ Here we can get ${\mathrm{\θ}}_{i3}=\frac{2\mathrm{\π}(i3-1)}{2N_2}.$

Other system of selection can certainly be had, such as non-uniform quantizing angle etc.Then first kind code book Φ ₁altogether comprise N=128*2*N ₂individual code word, wherein the generation method of kth=8 (i-1)+i2 code word is here represent that kronencker amasss, can certainly be write as other forms, but as long as complete identical function.Wherein, k is the index of first kind code word.

Given first kind code book index I (i1, i2, i2) and total number of plies υ can determine the Equations of The Second Kind code book generated in advance, and Equations of The Second Kind code book has feature by all and/or code word form.Wherein, the code book C that Func5 (i1, i2, k1) is and Func3 (i1, i2) is orthogonal _{i1, i2}middle index is the code word of k1, for length is the unit vector of 8, and the code book C that Func6 (i3, k3) and Func4 (i3) is orthogonal _i3middle index is the code word of k3, for length is N ₂unit vector.Here, Func3, Func4, Func5 and Func6 show respectively function, the Kronecker product (keroneck product) of representing matrix or other mathematic calculation, implementation with Kronecker product equivalence.

UE according to channel information, at C _{i1, i2}middle search needs the code book index j1 of feedback, and the code word of its correspondence is C _{i1, i2}(j1), at C _i2middle search needs the code book index j2 of feedback, and the code word of its correspondence is C _i2(j2), and feed back J to described base station, the form of J is (j1, j2).

It is pointed out that the number of antennas N of the present embodiment horizontal direction ₁also can get the form of 2,4, in corresponding LTE R8, number of antennas is the code book of 1 layer of 2 and 4 respectively.Also can get other situation being greater than the integer of 1, not enumerate here.

It is important to note that Equations of The Second Kind code book code word value and first kind code book code word value are not limited to described example.

Embodiment 6

The present embodiment illustrates how terminal selects code word, and generates corresponding feedback information.

Terminal obtains the wireless channel coefficient matrix H between terminal and base station, then from first kind code book Φ by down channel measuring reference signals ₁middle selection code word C _{1, k}, k=0,1 ..., N, here, N is the code word number of first kind code book.The corresponding in the codebook index of this code word is PMI1, terminal compute codeword C simultaneously _{1, k}and the coefficient correlation between channel coefficient matrix H is α.Terminal judges whether to need according to the value of α the codewords indexes feeding back Equations of The Second Kind code book, and generates corresponding indication information IndMessage, terminal by the information feed back of PMI1 and IndMessage to base station.If need the codewords indexes feedback doing Equations of The Second Kind code book, then terminal is at C _{1, k}, k=0,1 ..., the Equations of The Second Kind code book that N is corresponding middle selection code word C _{2, l}, compute codeword C simultaneously _{2, l}and the coefficient correlation between channel coefficient matrix H is β.Preferably, we can feed back 1 parameter, namely only feed back β, and now α=1 does not need feedback.α and β is utilized to generate coefficient or terminal utilizes the plural number generated in advance to quantize code book Ψ by G ₁be quantified as the plural β that index is Index, terminal by terminal by C _{2, l}at Equations of The Second Kind code book in index PMI2 feed back to base station, simultaneously by index Index information feed back to base station.

Embodiment 7

The present embodiment illustrates how base station utilizes the feedback of terminal to obtain the channel information of terminal.

If terminal only feeds back information PMI1 corresponding to one-level code word, then base station is by code book Φ ₁middle index is the code word C of PMI1 _{1, k}as the channel information that terminal is corresponding;

If terminal feedback two-stage code word PMI1 and PMI2, and complex coefficient quantitative information Index, if PMI1 is at Φ ₁the code word of middle correspondence is C _{1, k}, PMI2 exists the code word of middle correspondence is C _{2, l}, wherein Index quantizes value corresponding in code book Ψ in complex coefficient is β.

If system presets then base station utilizes the channel information of following formulae discovery terminal

$V=\frac{C_{1,k}+{\mathrm{\βC}}_{2,l}}{\mathrm{norm}(C_{1,k}+{\mathrm{\βC}}_{2,l})}$

If system presets then base station utilizes the channel information of following formulae discovery terminal

$V=\frac{{\mathrm{\βC}}_{1,k}+C_{2,l}}{\mathrm{norm}({\mathrm{\βC}}_{1,k}+C_{2,l})}$

Embodiment 8

As shown in Figure 6, the general processing procedure of once Single User MIMO and multiuser MIMO switching at runtime transmission mode is described below, comprises:

Step 101, transmitting terminal eNB sends descending channel information pilot reference information to UE, for user terminal test downlink channel condition;

Step 102, UE carries out down channel estimation according to the pilot frequency information received;

Step 103, UE determines the form of feeding back channel state information, comprises the index of first kind code book and the index of Equations of The Second Kind code book;

Step 104, UE by the information feedback of the index and Equations of The Second Kind code book index that comprise first kind code book to eNB;

Step 105, eNB, according to the channel condition information of feedback, dynamically selects the transmission of descending SU-MIMO or the transmission means of MU-MIMO, and produces weights according to the code word that the transmission means selected and utilization obtain, and carries out the communication with UE.

The system realizing said method comprises UE and base station, and described UE is used for codebook index information, scale parameter and total number of plies to feed back, and described codebook index information comprises the one of following information: first kind code book index I and Equations of The Second Kind code book index J; Wherein, first kind code book index I comprises one of following: i, (i1, i2), (i1 i2 i3), i1 be greater than 1 positive integer, i2 and i3 be more than or equal to 1 positive integer; Equations of The Second Kind code book index J comprises one of following: j or (j1, j2), wherein, j, j1, j2 be more than or equal to 1 positive integer.

Described base station is used for after receiving codebook index information, scale parameter and the total number of plies information that UE sends, and the code book table adopting inquiry to preset according to described information also combines the mode calculated and obtains code word matrix, and does normalized to code word matrix.Described codebook index information comprises the one of following information: first kind code book index I and Equations of The Second Kind code book index parameter J; Wherein, first kind code book index I comprises one of following: i, (i1, i2), (i1 i2 i3), i1 be greater than 1 positive integer, i2 and i3 be more than or equal to 1 positive integer; Equations of The Second Kind code book index J comprises one of following: j or (j1, j2), wherein, j, j1, j2 be more than or equal to 1 positive integer.

The concrete operations of UE and base station are see said method.

What adopt the method for the invention can be embodied as extensive Massive MIMO transmission provides high-precision channel condition information.

The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.

Claims (32)

1. a method for feeding back channel state information, is characterized in that, the method comprises:

User equipment (UE) is to base station feedback channel condition information, and described channel condition information comprises codebook index information, scale parameter;

Described codebook index information comprises: first kind code book index I and/or Equations of The Second Kind code book index J; Described scale parameter comprises: the first scale parameter α and/or the second scale parameter β.

2. method according to claim 1, is characterized in that, described first kind code book index I comprises: any one in i, (i1, i2), (i1 i2 i3); Described i, described i1, described i2, described i3 be more than or equal to 1 positive integer;

Described Equations of The Second Kind code book index J is j or (j1, j2); Described j, described j1, described j2 be more than or equal to 1 positive integer;

Described first scale parameter α is plural number, 0≤| α |≤1; Described second scale parameter β is plural number.

3. method according to claim 2, is characterized in that, the method also comprises:

Described UE obtains channel matrix H, determines the code word matrix in total number of plies information υ and the first codebook matrix according to H the index of its correspondence is first kind code book index I, and feeds back first kind code book index I, wherein, a N _tthe complex matrix of × υ;

Described UE is according to described code word matrix generate Equations of The Second Kind code book;

Described UE determines the code word matrix BMat in Equations of The Second Kind code book according to H _j, the index of its correspondence is Equations of The Second Kind code book index J, and feeds back Equations of The Second Kind code book index J, wherein, and BMat _ja N _tthe complex matrix of × υ.

4. method according to claim 3, is characterized in that, described code word matrix when I is (i1, i2), ${\mathrm{AMat}}_I^v=\mathrm{Func}3\left(i1\right)\⊗\mathrm{Func}4\left(i2\right);$

Described code word matrix when I is (i1 i2 i3), ${\mathrm{AMat}}_I^v=\mathrm{Func}3(i1,i2)\⊗\mathrm{Func}4\left(i3\right);$

Wherein, described Func3, described Func4 be representative function respectively, described in the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

5. method according to claim 3, is characterized in that, according to described code word matrix generate Equations of The Second Kind code book, each code word of described Equations of The Second Kind code book with orthogonal.

6. method according to claim 5, is characterized in that, according to described code word matrix generate Equations of The Second Kind code book, comprise by described first kind code book with orthogonal code word forms Equations of The Second Kind code book, and the code word number that Equations of The Second Kind code book comprises is M, 0≤M≤N-1, and wherein, described N represents the code word number of first kind code book.

7. method according to claim 5, is characterized in that, according to described code word matrix generate Equations of The Second Kind code book, comprise for given by code word W 2 all in code book C2 ₁, W2 ₂..., W2 _mproject to orthogonal intersection space, obtain M projection code word, described M projection code word formation Equations of The Second Kind code book; Described code book C2, by code word W 2 ₁, W2 ₂..., W2 _mform.

8. method according to claim 7, is characterized in that, by the code word W 2 in C2 _kproject to orthogonal intersection space be expressed as: ${\mathrm{BMat}}_k=(E-{\mathrm{AMat}}_I^v{\left({\left(\mathrm{AMa}{t}_I^v\right)}^H{\mathrm{AMat}}_I^v\right)}^{-1}\·{\left(\mathrm{AMa}{t}_I^v\right)}^H)\·{W2}_k,$ K=1 ..., M, E represent N _t× N _tunit matrix.

9. method according to claim 5, is characterized in that, according to described code word matrix generating Equations of The Second Kind code book is secondary series to last row, k=1 ..., M, represent by vector the householder transformation matrix of structure.

10. method according to claim 4, is characterized in that, according to described code word matrix code word in the Equations of The Second Kind code book generated has structure wherein, A ₁and/or A orthogonal with Func3 (i1) ₂it is orthogonal with Func4 (i2), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

11. methods according to claim 4, is characterized in that, according to described code word matrix code word in the Equations of The Second Kind code book generated has wherein, A ₁orthogonal and/or the A with Func3 (i1, i2) ₂it is orthogonal with Func4 (i3), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

12. methods according to any one of claim 5 to 11, it is characterized in that, the method also comprises: described base station is according to the first kind code book index I of the described UE transmission received and/or Equations of The Second Kind code book index J, the first scale parameter α and/or the second scale parameter β, and the code book table adopting inquiry the to preset mode that also combination calculates obtains code word matrix.

13. methods according to claim 12, is characterized in that, the code word matrix that described base station obtains func1 representative function, the result of calculation of Func1 (I) is N _t× υ matrix is I code word of first kind code book; Func2 representative function, the result of calculation of Func2 (J) is N _t× υ matrix, be J code word of the Equations of The Second Kind code book of I the code word generation according to first kind code book, α, β are plural numbers, are scale parameter.

14. methods according to claim 13, it is characterized in that, the method also comprises: described base station is to the code word matrix obtained do normalized.

15. methods according to claim 13 or 14, it is characterized in that, the method also comprises: the code word matrix that described base station reference obtains is dispatched UE, selects downlink transmission mode to communicate with UE;

Described downlink transmission mode comprise in single user MIMO transmission pattern, Multi-user mimo transmissions pattern, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission pattern any one.

The terminal of 16. 1 kinds of feeding back channel state informations, is characterized in that, described terminal comprises:

Feedback unit, for base station feedback channel condition information, described channel condition information comprises codebook index information, scale parameter; Wherein, described codebook index information comprises: first kind code book index I and/or Equations of The Second Kind code book index J; Described scale parameter comprises: the first scale parameter α and/or the second scale parameter β.

17. terminals according to claim 16, is characterized in that, described feedback unit comprises further:

Information generates subelement, and for generating described first kind code book index I, described first kind code book index I comprises: any one in i, (i1, i2), (i1 i2 i3); Described i, described i1, described i2, described i3 be more than or equal to 1 positive integer; Generate described Equations of The Second Kind code book index J, described Equations of The Second Kind code book index J is j or (j1, j2); Described j, described j1, described j2 be more than or equal to 1 positive integer; Generate described first scale parameter α, described first scale parameter α is plural number, 0≤| α |≤1; Generate described second scale parameter β, described second scale parameter β is plural number.

18. terminals according to claim 17, is characterized in that, described information generates subelement, is further used for obtaining channel matrix H by UE, determines the code word matrix in total number of plies information υ and the first codebook matrix according to H the index of its correspondence is first kind code book index I, and feeds back first kind code book index I, wherein, a N _tthe complex matrix of × υ; Described UE is according to described code word matrix generate Equations of The Second Kind code book; Described UE determines the code word matrix BMat in Equations of The Second Kind code book according to H _j, the index of its correspondence is Equations of The Second Kind code book index J, and feeds back Equations of The Second Kind code book index J, wherein, and BMat _ja N _tthe complex matrix of × υ.

19. terminals according to claim 18, is characterized in that, described information generates subelement, is further used for described code word matrix when I is (i1, i2), described code word matrix when I is (i1 i2 i3), wherein, described Func3, described Func4 be representative function respectively, described in the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

20. terminals according to claim 18, is characterized in that, described information generates subelement, is further used for described according to code word matrix generate Equations of The Second Kind code book, each code word of described Equations of The Second Kind code book with orthogonal.

21. terminals according to claim 20, is characterized in that, described information generates subelement, is further used for according to described code word matrix generate Equations of The Second Kind code book, comprise by described first kind code book with orthogonal code word forms Equations of The Second Kind code book, and the code word number that Equations of The Second Kind code book comprises is M, 0≤M≤N-1, and wherein, described N represents the code word number of first kind code book.

22. terminals according to claim 20, is characterized in that, described information generates subelement, is further used for according to described code word matrix generate Equations of The Second Kind code book, comprise for given by code word W 2 all in code book C2 ₁, W2 ₂..., W2 _mproject to orthogonal intersection space, obtain M projection code word, described M projection code word formation Equations of The Second Kind code book; Described code book C2, by code word W 2 ₁, W2 ₂..., W2 _mform.

23. terminals according to claim 22, is characterized in that, described information generates subelement, is further used for the code word W 2 in C2 _kproject to orthogonal intersection space be expressed as: ${\mathrm{BMat}}_k=(E-{\mathrm{AMat}}_I^v{\left({\left(\mathrm{AMa}{t}_I^v\right)}^H{\mathrm{AMat}}_I^v\right)}^{-1}\·{\left(\mathrm{AMa}{t}_I^v\right)}^H)\·{W2}_k,$ K=1 ..., M, E represent N _t× N _tunit matrix.

24. terminals according to claim 20, is characterized in that, described information generates subelement, is further used for according to described code word matrix generating Equations of The Second Kind code book is secondary series to last row, k=1 ..., M, represent by vector the householder transformation matrix of structure.

25. terminals according to claim 19, is characterized in that, described information generates subelement, is further used for according to described code word matrix code word in the Equations of The Second Kind code book generated has wherein, A ₁and/or A orthogonal with Func3 (i1) ₂it is orthogonal with Func4 (i2), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

26. terminals according to claim 19, is characterized in that, described information generates subelement, is further used for according to described code word matrix code word in the Equations of The Second Kind code book generated has wherein, A ₁orthogonal and/or the A with Func3 (i1, i2) ₂it is orthogonal with Func4 (i3), the Kronecker product of representing matrix or with other algorithm of Kronecker product equivalence or implementation.

27. 1 kinds of base stations obtaining channel condition information, it is characterized in that, described base station comprises:

Acquiring unit, for obtaining the channel condition information of user equipment (UE) feedback, described channel condition information comprises codebook index information, scale parameter; Wherein, described codebook index information comprises: first kind code book index I and/or Equations of The Second Kind code book index J; Described scale parameter comprises: the first scale parameter α and/or the second scale parameter β.

28. base stations according to claim 27, is characterized in that, described acquiring unit, comprises further:

Resolve subelement, for parsing described first kind code book index I, described first kind code book index I comprises: any one in i, (i1, i2), (i1 i2 i3); Described i, described i1, described i2, described i3 be more than or equal to 1 positive integer; Parse described Equations of The Second Kind code book index J, described Equations of The Second Kind code book index J is j or (j1, j2); Described j, described j1, described j2 be more than or equal to 1 positive integer; Parse described first scale parameter α, described first scale parameter α is plural number, 0≤| α |≤1; Parse described second scale parameter β, described second scale parameter β is plural number.

29. base stations according to claim 28, it is characterized in that, described parsing subelement, be further used for the first kind code book index I according to the described UE transmission received and/or Equations of The Second Kind code book index J, the first scale parameter α and/or the second scale parameter β, default code book table is inquired about in employing and the mode of combination calculating resolves acquisition code word matrix.

30. base stations according to claim 29, is characterized in that, described parsing subelement, are further used for resolving the code word matrix obtained func1 representative function, the result of calculation of Func1 (I) is N _t× υ matrix is I code word of first kind code book; Func2 representative function, the result of calculation of Func2 (J) is N _t× υ matrix, be J code word of the Equations of The Second Kind code book of I the code word generation according to first kind code book, α, β are plural numbers, are scale parameter.

31. base stations according to claim 30, is characterized in that, described acquiring unit, comprises further:

Normalized subelement, for base station to the code word matrix obtained do normalized.

32. base stations according to claim 30 or 31, it is characterized in that, described acquiring unit, comprises further:

Scheduling sublayer unit, the code word matrix obtained for described base station reference is dispatched UE, selects downlink transmission mode to communicate with UE; Described downlink transmission mode comprise in single user MIMO transmission pattern, Multi-user mimo transmissions pattern, single user/multi-user's switching at runtime transmission mode and coordinated multipoint transmission pattern any one.