CN104144006A - Channel state information transmission method, user equipment and base station in MIMO system - Google Patents

Abstract

The invention discloses a channel state information transmission method, user equipment and a base station in an MIMO system. The method comprises the steps that according to obtained CSI of a channel, a first precoding matrix and a first PMI which correspond to each other are found in a first codebook layer of a planar antenna array, wherein the first PMI is the PMI of the first precoding matrix; according to the CSI and the first PMI, a second precoding matrix and a second PMI which correspond to each other are found in a second codebook layer of the planar antenna array, wherein the second PMI is the PMI of the second precoding matrix; the first PMI and the second PMI are reported to the base station. The first codebook layer of the planar antenna array is obtained by conducting direct product operation on first codebook layers of linear arrays in the x-axis direction and the y-axis direction of the planar antenna array, and the x-axis and the y-axis are straight lines where two perpendicular sides of the planar antenna array are located. According to the channel state information transmission method, the user equipment and the base station in the MIMO system, the precoding performance of the system is improved, and effective CSI feedback and precoding operation are provided for a large-scale antenna system.

Description

The transmission method of the channel condition information in mimo system, subscriber equipment and base station

Technical field

The application relates to wireless communication technology field, particularly the transmission method of the channel condition information in a kind of mimo system, subscriber equipment (User Equipment, UE) and base station.

Background technology

At multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) in system, in order to improve system transmission performance by carrying out precoding at transmitting terminal, transmitting terminal need to be known channel condition information (Channel Statement Information, CSI), and CSI utilizes reference sequences to carry out channel estimating by receiving terminal conventionally, obtain, this just needs receiving terminal to feed back CSI to transmitting terminal.Yet the finiteness of CSI feedback channel has determined that the design of precoding codebook is necessary.

At present existing a lot of precoding codebooks are suggested, for example: be applied to LTE(Long Term Evolution, Long Term Evolution) dicode based on discrete Fourier transform (Discrete Fourier Transform, DFT) of Release10 this.Dicode originally designs for the correlation properties of channel, consists of: ground floor code book and second layer code book two-layer.The long-time statistical characteristic of ground floor code book for portraying channel, second layer code book is for reflecting the short term variations of channel.If W1 is the pre-coding matrix of ground floor code book, W2 is the pre-coding matrix of second layer code book, final pre-coding matrix W=W1 * W2.

The long-time statistical characteristic of channel depends primarily on the channel relevancy of channel, and channel relevancy is subject to the impact of antenna array layout.Under traditional multiaerial system (number of antenna elements is less), antenna array layout adopts linear antenna array layout conventionally, as uniform linear array (Uniform Linear Array, ULA); But under extensive antenna system (number of antenna elements is a lot), due to the constraint on space, antenna array layout is more prone to adopt the antenna array layout of plane, as even rectangular array (Uniform Rectangle Array, URA).Yet, the dicode of most is all originally to design for linear antenna array layout, for the antenna array layout of plane, this just cannot portray the long-time statistical characteristic of channel well these dicodes, thereby system precoding performance is had to larger impact like this.

Summary of the invention

The application provides transmission method, subscriber equipment and the base station of the channel condition information in a kind of mimo system, to solve most of dicode of the prior art, be not originally suitable for the antenna array layout of plane, cannot portray well the long-time statistical characteristic of the channel of the antenna array layout that adopts plane, thereby system precoding performance be had to the problem of larger impact.

The application's technical scheme is as follows:

On the one hand, provide the transmission method of CSI in a kind of mimo system, the antenna array layout of mimo system adopts the aerial array of plane, and the method is applied to UE, and the method comprises:

According to the CSI of the channel getting, in the ground floor code book of the aerial array of plane, find corresponding the first pre-coding matrix and a PMI, wherein, a PMI is the PMI of the first pre-coding matrix;

According to CSI and a PMI, in the second layer code book of the aerial array of plane, find corresponding the second pre-coding matrix and the 2nd PMI, wherein, the 2nd PMI is the PMI of the second pre-coding matrix;

The one PMI and the 2nd PMI are reported to base station;

Wherein, the ground floor code book of the aerial array of plane is the aerial array of plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of plane.

On the other hand, also provide the transmission method of the CSI in a kind of mimo system, the antenna array layout of mimo system adopts the aerial array of plane, and the method is applied to base station, and the method comprises:

Receive a PMI and the 2nd PMI that UE reports;

According to a PMI who receives, in the ground floor code book of the aerial array of plane, find the first corresponding pre-coding matrix, according to the 2nd PMI receiving, in the second layer code book of the aerial array of plane, find the second corresponding pre-coding matrix;

In the time will sending data, use the first pre-coding matrix and the second pre-coding matrix long-pending, data are carried out to precoding;

Wherein, the ground floor code book of the aerial array of plane is the aerial array of plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of plane.

Another aspect, also provides the UE in a kind of mimo system, and the antenna array layout of mimo system adopts the aerial array of plane, and this UE comprises:

Acquisition module, for obtaining the CSI of channel;

Search module, for the CSI of the channel that gets according to acquisition module, in the ground floor code book of the aerial array of plane, find corresponding the first pre-coding matrix and a PMI, wherein, a PMI is the PMI of the first pre-coding matrix; Also for according to CSI and a PMI, in the second layer code book of the aerial array of plane, find corresponding the second pre-coding matrix and the 2nd PMI, wherein, the 2nd PMI is the PMI of the second pre-coding matrix;

Sending module, for by search module searches to a PMI and the 2nd PMI report base station;

Wherein, the ground floor code book of the aerial array of plane is the aerial array of plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of plane.

Another aspect, also provides the base station in a kind of mimo system, and the antenna array layout of mimo system adopts the aerial array of plane, and this base station comprises:

Receiver module, for receiving a PMI and the 2nd PMI of reported by user equipment UE;

Search module, for a PMI who receives according to receiver module, in the ground floor code book of the aerial array of plane, find the first corresponding pre-coding matrix, according to the 2nd PMI receiving, in the second layer code book of the aerial array of plane, find the second corresponding pre-coding matrix;

Precoding module, in the time will sending data, is used and to search the first pre-coding matrix that module searches arrives and amass with the second pre-coding matrix is, and data are carried out to precoding;

Wherein, the ground floor code book of the aerial array of plane is the aerial array of plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of plane.

In the application's technique scheme, Kronecker approximation theory based on URA correlation, by the aerial array of plane is carried out to operation of direct product at the ground floor code book of the linear array of orthogonal both direction, obtain the ground floor code book of the aerial array of plane, thereby the antenna array layout for plane has built the ground floor code book in dicode basis, be applicable to the application under the antenna array layout of plane, portray well the long-time statistical characteristic of the channel of the antenna array layout that adopts plane, improved system precoding performance, for extensive antenna system provides effective CSI feedback and pre-encode operation.

Accompanying drawing explanation

Fig. 1 is the flow chart of the transmission method of the CSI in the application's the mimo system of embodiment mono-;

Fig. 2 is the flow chart of the transmission method of the CSI in the application's the mimo system of embodiment bis-;

Fig. 3 is URA4 * 4 schematic layout pattern of 32 crossed antenna units of the application's embodiment tri-;

Fig. 4 is URA4 * 4 schematic layout pattern of 16 single-polarized antenna units of the application's embodiment tetra-;

Fig. 5 is URA8 * 4 schematic layout pattern of 32 single-polarized antenna units of the application's embodiment five;

Fig. 6 is the structural representation of the UE in the application's the mimo system of embodiment six;

Fig. 7 is the structural representation of the base station in the application's the mimo system of embodiment seven.

Embodiment

In order to solve most of dicode of the prior art, be all originally to design for linear antenna array layout, be not suitable for the antenna array layout of plane, cannot portray well the long-time statistical characteristic of the channel of the antenna array layout that adopts plane, thereby the problem that system precoding performance is had to larger impact, the transmission method of the channel condition information in a kind of mimo system is provided in following examples of the application, and a kind of UE and the base station that can apply the method.

In following examples, the antenna array layout of mimo system adopts the aerial array of plane, for example, URA etc., the application does not limit this.

Embodiment mono-

The transmission method of CSI in the mimo system of the present embodiment one can be carried out by any one UE.As shown in Figure 1, the method comprises the following steps:

Step S102 according to the CSI of the channel getting, finds corresponding the first pre-coding matrix and a PMI in the ground floor code book of the aerial array of plane, and wherein, a PMI is the PMI of the first pre-coding matrix;

When reality is implemented, UE can carry out channel estimating according to the pilot frequency sequence receiving, and obtains CSI.

Because each pre-coding matrix in code book is corresponding to a PMI(Precoding Matrix Indicator, pre-coding matrix indication), therefore, according to the CSI getting, can in the ground floor code book of the aerial array of plane, find corresponding pre-coding matrix (being called the first pre-coding matrix) and PMI(corresponding to the first pre-coding matrix is called a PMI).The long-time statistical characteristic of the ground floor code book of the aerial array of plane for portraying channel.

Wherein, the ground floor code book of the aerial array of plane is the aerial array of plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of plane.

Step S104 according to the CSI obtaining and a PMI, finds corresponding the second pre-coding matrix and the 2nd PMI in the second layer code book of the aerial array of plane, and wherein, the 2nd PMI is the PMI of the second pre-coding matrix;

Equally, because each pre-coding matrix in code book is corresponding to a PMI, therefore, according to the CSI obtaining and the PMI that finds, can in the second layer code book of the aerial array of plane, find corresponding pre-coding matrix (being called the second pre-coding matrix) and PMI(corresponding to the second pre-coding matrix is called the 2nd PMI in step S102).The second layer code book of the aerial array of plane is for reflecting the short term variations of channel.

Step S106, reports base station by a PMI and the 2nd PMI.

In actual implementation process, after the transmission indication that UE can be in receiving scheduling grant, by PUCCH(Physical Uplink Control CHannel, physical uplink control channel) or PUSCH(Physical Uplink Shared CHannel, Physical Uplink Shared Channel) report to cycle or aperiodic a PMI and the 2nd PMI.

In the prior art, because most of dicodes are all originally to design for linear antenna array layout, be not suitable for the antenna array layout of plane, cannot portray well the long-time statistical characteristic of the channel of the antenna array layout that adopts plane, thereby system precoding performance is had to larger impact, therefore, the present embodiment has originally carried out redesigning (or structure) for the dicode of the antenna array layout of plane.

For this structure of the dicode of the antenna array layout of plane, the dicode of antenna array layout that can be based on for linear originally builds to carry out.Take plane antenna array layout as URA be example, consider a URA in XY plane, the correlation matrix of establishing this URA is R, the correlation matrix of the antenna element in x direction is R _x, the correlation matrix of the antenna element in y direction is R _y, suppose R _xbe independent of (not relying on) R _y, there is following character:

$R=R_x\⊗R_y$

Wherein, operation of direct product symbol for matrix.

This character is called the Kronecker approximation theory of URA correlation, can be used as for this construction basis of the dicode of the antenna array layout of plane.

Thereby the ground floor code book of the aerial array of plane and the concrete building process of second layer code book are as follows:

Step S201, using the straight line at the place, orthogonal two limits of the aerial array of plane respectively as x axle and y axle;

Step S202, at the axial linear array of x, builds its ground floor code book for the aerial array of plane, is designated as:

wherein, for the aerial array of the plane pre-coding matrix in the ground floor code book of the axial linear array of x, G _xfor the aerial array of the plane codebook size at the ground floor code book of the axial linear array of x.

Step S203, at the axial linear array of y, builds its ground floor code book for the aerial array of plane, is designated as:

wherein, for the aerial array of the plane pre-coding matrix in the ground floor code book of the axial linear array of y, G _yfor the aerial array of the plane codebook size at the ground floor code book of the axial linear array of y.

Step S204, according to the aerial array of step S202 midplane at the ground floor code book of the axial linear array of x and the aerial array of step S203 midplane the ground floor code book at the axial linear array of y, the ground floor code book that builds the aerial array of plane, can carry out according to following two kinds of situations:

Situation one: when all antenna elements polarize in the same way in the aerial array of plane, each the pre-coding matrix W1 in the ground floor code book of the aerial array of plane is:

$W1=X_{g_1}\⊗Y_{g_2},g_1=\mathrm{0,1},...,G_x-1,g_2=\mathrm{0,1},...,G_y-1,$ Wherein, for the operation of direct product symbol of matrix, the size of W1 is M ₁* N ₁, M ₁for the antenna element sum of the aerial array of plane, N ₁>=1.

Situation two: during antenna element cross polarization in the aerial array of plane, that is, in a day or two line element and in addition in a day or two line element carry out cross polarization, each the pre-coding matrix W1 in the ground floor code book of the aerial array of plane is:

$W1=\left[\begin{array}{cc}{X}_{g_1}\⊗Y_{g_2}& 0\\ 0& X_{g_1}\⊗Y_{g_2}\end{array}\right],$ G ₁=0,1 ..., G _x-1, g ₂=0,1 ..., G _y-1, wherein, for the operation of direct product symbol of matrix, the size of W1 is M ₁* N ₁, M ₁for the antenna element sum of the aerial array of plane, N ₁>=2.

Step S205, the size of each pre-coding matrix in the second layer code book of the aerial array of plane is M ₂* N ₂, wherein, N ₂for the number of spatial reuse data flow, M ₂=N ₁.Wherein, the concrete construction method of the second layer code book of the aerial array of plane can adopt the method for prior art, and the application does not limit this.

Embodiment bis-

The transmission method of CSI in the mimo system of the present embodiment two can be carried out by any one base station.As shown in Figure 2, the method comprises the following steps:

Step S302, receives a PMI and the 2nd PMI that UE reports;

When reality is implemented, base station obtains a PMI and the 2nd PMI from up channel.

Step S304, according to a PMI who receives, in the ground floor code book of the aerial array of plane, find the first corresponding pre-coding matrix, according to the 2nd PMI receiving, in the second layer code book of the aerial array of plane, find the second corresponding pre-coding matrix;

Wherein, the ground floor code book of the aerial array of plane is the aerial array of plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of plane.

Step S306, in the time will sending data, is used the first pre-coding matrix and the second pre-coding matrix long-pending, and data are carried out to precoding.

In step S306, suppose that the data vector that base station will send is x, the data after precoding are: the product of x, the first pre-coding matrix and the second pre-coding matrix.

The ground floor code book of the aerial array of plane and the concrete building process of second layer code book can, referring to the step S201-step S205 in embodiment mono-, repeat no more here.

Embodiment tri-

The code book design philosophy of the present embodiment three based on discrete fourier (DFT), URA 4 * 4 layouts of 32 dual polarized antenna units of take are as shown in Figure 3 example, describe the method in above-described embodiment one and two in detail.In Fig. 3, every line segment represents 1 antenna element, and the line segment that direction is identical represents that the polarised direction of the antenna element that it is corresponding is identical.

For the ground floor code book of URA and the concrete construction method of second layer code book, comprise the following steps:

Step S401, using the straight line at the place, orthogonal two limits of URA as shown in Figure 3 as x direction of principal axis and y direction of principal axis;

Step S402, at the corresponding linear array of x direction of principal axis, builds its ground floor code book based on rotation DFT matrix for URA, is designated as:

$\left\{X_{g_1}\right|g_1=\mathrm{0,1},...,G_x-1\}$

Wherein, be a M _x* N _xmatrix, G _xfor codebook size, in capable and be calculated as follows at the element of n row at m:

${\left[X_{g_1}\right]}_{m,n}=\frac{1}{\sqrt{N_x}}\exp \left(j\frac{2\mathrm{\π}}{N_x}m(n+\frac{g_1}{G_x})\right),m=0,...,M_x-1,n=0,...,N_x-1,g_1=0,...,G_x-1$

Can make M _x=4, N _x=4, G _x=4, so just obtain the rotation DFT matrix of 44 * 4: X ₀, X ₁, X ₂, X ₃, that is, URA comprises these 4 rotation DFT matrixes at the ground floor code book of the corresponding linear array of x direction of principal axis.

Step S403, at the corresponding linear array of y direction of principal axis, builds its ground floor code book based on rotation DFT matrix for URA.Because the axial antenna element of y equates with the axial antenna element of x, therefore obtain the same rotation DFT matrix of 44 * 4: X ₀, X ₁, X ₂, X ₃, that is, URA comprises these 4 rotation DFT matrixes at the ground floor code book of the corresponding linear array of y direction of principal axis.

Step S404, the result based on obtaining in step S402 and step S403, for the cross-polarized situation of antenna element, structure is for the pre-coding matrix in the ground floor code book of URA, the matrix size of this pre-coding matrix is 32 * 32, that is, this pre-coding matrix is the matrix of 32 * 32.I in the ground floor code book of URA ₁(i ₁=0,1 ..., 15) expression formula of individual pre-coding matrix is as follows:

$W_1\left(i_1\right)=\left[\begin{array}{cc}{X}_{g_1}\⊗Y_{g_2}& 0\\ 0& X_{g_1}\⊗Y_{g_2}\end{array}\right],$ g ₁＝0,1,2,3,g ₂＝0,1,2,3,i ₁=4g ₁+g ₂

Step S405, the situation that is 1 for spatial reuse data flow number, the size of the pre-coding matrix in the second layer code book of URA is 32 * 1, i ₂(i ₂=0,1 ..., 63) expression formula of individual pre-coding matrix is as follows:

$W_2\left(i_2\right)=\left[\begin{array}{c}{v}_{k_1}\\ e^{\mathrm{j\π}{k}_2/2}{v}_{k_1}\end{array}\right],$ k ₁＝0,1,...,15,k ₂＝0,1,2,3,i ₂=4k ₁+k ₂

Wherein, wei Yige unit's column vector, the k of unit column vector ₁behavior 1, all the other each behaviors 0.

The concrete operation step of the CSI transmission method of the present embodiment three is as follows:

Step S501, UE carries out channel estimating according to the pilot frequency sequence receiving, and obtains CSI;

Step S502, according to the CSI obtaining in step S501, UE finds for portraying corresponding pre-coding matrix and the PMI1 thereof of the long-time statistical characteristic of channel from the ground floor code book of above-mentioned URA;

Step S503, according to the PMI1 finding in the CSI obtaining in step S501 and step S502, UE finds for reflecting corresponding pre-coding matrix and the PMI2 thereof of the short term variations of channel from the second layer code book of above-mentioned URA;

Step S504, UE receives after transmission in scheduling grant indication, by PUCCH or PUSCH cycle/aperiodic report PMI1 and PMI2 to base station;

Step S505, base station receives PMI1 and PMI2 from up channel;

Step S506, base station, according to PMI1, finds corresponding pre-coding matrix W1 from the ground floor code book of above-mentioned URA, according to PMI2, finds corresponding pre-coding matrix W2 from the second layer code book of above-mentioned URA, and final pre-coding matrix is W=W1 * W2;

Step S507, supposes that the information symbol vector of base station transmitting, for x, is y=W * x after precoding.

Embodiment tetra-

The code book design philosophy of the present embodiment four based on discrete fourier (DFT), the URA 4x4 layout of 16 single-polarized antenna units of take is as shown in Figure 4 example, describes the method in above-described embodiment one and two in detail.In Fig. 4, each arrow represents 1 antenna element.

Step S601, using the straight line at the place, orthogonal two limits of URA as shown in Figure 4 as x direction of principal axis and y direction of principal axis;

Step S602, at the corresponding linear array of x direction of principal axis, builds its ground floor code book based on rotation DFT matrix for URA, is designated as:

$\left\{X_{g_1}\right|g_1=\mathrm{0,1},...,G_x-1\}$

Wherein, be a M _x* N _xmatrix, G _xfor codebook size, in capable and be calculated as follows at the element of n row at m:

${\left[X_{g_1}\right]}_{m,n}=\frac{1}{\sqrt{N_x}}\exp \left(j\frac{2\mathrm{\π}}{N_x}m(n+\frac{g_1}{G_x})\right),m=0,...,M_x-1,n=0,...,N_x-1,g_1=0,...,G_x-1$

Can make M _x=4, N _x=4, G _x=4, so just obtain the rotation DFT matrix of 44 * 4: X ₀, X ₁, X ₂, X ₃, that is, URA comprises these 4 rotation DFT matrixes at the ground floor code book of the corresponding linear array of x direction of principal axis.

Step S603, at the corresponding linear array of y direction of principal axis, builds its ground floor code book based on rotation DFT matrix for URA.Because the axial antenna element of y equates with the axial antenna element of x, therefore obtain the same rotation DFT matrix of 44 * 4: X ₀, X ₁, X ₂, X ₃, that is, URA comprises these 4 rotation DFT matrixes at the ground floor code book of the corresponding linear array of y direction of principal axis.

Step S604, the result based on obtaining in step S602 and step S603, for the situation of antenna element single polarization, structure is for the pre-coding matrix in the ground floor code book of URA, the matrix size of this pre-coding matrix is 16 * 16, that is, this pre-coding matrix is the matrix of 16 * 16.I in the ground floor code book of URA ₁(i ₁=0,1 ..., 15) expression formula of individual pre-coding matrix is as follows:

$W_1\left(i_1\right)=X_{g_1}\⊗Y_{g_2},g_1=\mathrm{0,1,2,3},g_2=\mathrm{0,1,2,3},i_1=4g_1+g_2$

Step S605, the situation that is 1 for spatial reuse data flow number, the size of the pre-coding matrix in the second layer code book of URA is 16 * 1, i ₂(i ₂=0,1 ..., 15) expression formula of individual pre-coding matrix is as follows:

$W_2\left(i_2\right)=v_{i_2},i_2=\mathrm{0,1},...,15$

Wherein, wei Yige unit's column vector, the i of unit column vector ₂behavior 1, all the other each behaviors 0.

The concrete operation step of the CSI transmission method of the present embodiment four, with the step S501-step S507 of embodiment tri-, repeats no more here.

Embodiment five

The code book design philosophy of the present embodiment five based on discrete fourier (DFT), URA 8 * 4 layouts of 32 single-polarized antenna units of take are as shown in Figure 5 example, describe the method in above-described embodiment one and two in detail.In Fig. 5, each arrow represents 1 antenna element.

Step S701, using the straight line at the place, orthogonal two limits of URA as shown in Figure 5 as x direction of principal axis and y direction of principal axis;

Step S702, at the corresponding linear array of x direction of principal axis, builds its ground floor code book based on rotation DFT matrix for URA, is designated as:

$\left\{X_{g_1}\right|g_1=\mathrm{0,1},...,G_x-1\}$

Wherein, be a M _x* N _xmatrix, G _xfor codebook size, in capable and be calculated as follows at the element of n row at m:

${\left[X_{g_1}\right]}_{m,n}=\frac{1}{\sqrt{N_x}}\exp \left(j\frac{2\mathrm{\π}}{N_x}m(n+\frac{g_1}{G_x})\right),m=0,...,M_x-1,n=0,...,N_x-1,g_1=0,...,G_x-1$

Can make M _x=8, N _x=4, G _x=8, so just obtain the rotation DFT matrix of 88 * 4 that is, URA comprises these 8 rotation DFT matrixes at the ground floor code book of the corresponding linear array of x direction of principal axis.

Step S703, at the corresponding linear array of y direction of principal axis, builds its ground floor code book based on rotation DFT matrix for URA, is designated as:

$\left\{Y_{g_2}\right|g_2=\mathrm{0,1},...,G_y-1\}$

Wherein, be a M _y* N _ymatrix, G _yfor codebook size, in capable and be calculated as follows at the element of n row at m:

${\left[Y_{g_2}\right]}_{m,n}=\frac{1}{\sqrt{N_y}}\exp \left(j\frac{2\mathrm{\π}}{N_y}m(n+\frac{g_2}{G_y})\right),m=0,...,M_y-1,n=0,...,N_y-1,g_2=0,...,G_y-1$

Can make M _y=4, N _y=4, G _y=4, so just obtain the rotation DFT matrix of 44 * 4 that is, URA comprises these 4 rotation DFT matrixes at the ground floor code book of the corresponding linear array of y direction of principal axis.

Step S704, the result based on obtaining in step S702 and step S703, for the situation of antenna element single polarization, structure is for the pre-coding matrix in the ground floor code book of URA, the matrix size of this pre-coding matrix is 32 * 16, that is, this pre-coding matrix is the matrix of 32 * 16.I in the ground floor code book of URA ₁(i ₁=0,1 ..., 31) expression formula of individual pre-coding matrix is as follows:

$W_1\left(i_1\right)=X_{g_1}\⊗Y_{g_2},g_1=\mathrm{0,1},...,7,g_2=\mathrm{0,1,2,3},i_1=4g_1+g_2$

Step S705, the situation that is 1 for spatial reuse data flow number, the size of the pre-coding matrix in the second layer code book of URA is 16 * 1, i ₂(i ₂=0,1 ..., 15) expression formula of individual pre-coding matrix is as follows:

$W_2\left(i_2\right)=v_{i_2},i_2=\mathrm{0,1},...,15$

Wherein, wei Yige unit's column vector, the i of unit column vector ₂behavior 1, all the other each behaviors 0.

The concrete operation step of the CSI transmission method of the present embodiment five, with the step S501-step S507 of embodiment tri-, repeats no more here.

Embodiment six

For the method in above-described embodiment one, the present embodiment six provides the UE in a kind of mimo system.As shown in Figure 6, this UE comprises with lower module: acquisition module 101, search module 102 and sending module 103, wherein:

Acquisition module 101, for obtaining the CSI of channel;

Search module 102, for the CSI of the channel that gets according to acquisition module 101, in the ground floor code book of the aerial array of plane, find corresponding the first pre-coding matrix and a PMI, wherein, a PMI is the PMI of the first pre-coding matrix; Also for according to CSI and a PMI, in the second layer code book of the aerial array of plane, find corresponding the second pre-coding matrix and the 2nd PMI, wherein, the 2nd PMI is the PMI of the second pre-coding matrix;

Sending module 103, for reporting base station by searching a PMI and the 2nd PMI that module 103 finds;

Wherein, the ground floor code book of the aerial array of plane is the aerial array of plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of plane.

Embodiment seven

For the method in above-described embodiment two, the present embodiment seven provides the base station in a kind of mimo system.As shown in Figure 7, this base station comprises with lower module:

Receiver module 201, for receiving a PMI and the 2nd PMI of reported by user equipment UE;

Search module 202, for a PMI who receives according to receiver module 201, in the ground floor code book of the aerial array of plane, find the first corresponding pre-coding matrix, according to the 2nd PMI receiving, in the second layer code book of the aerial array of plane, find the second corresponding pre-coding matrix;

Precoding module 203, in the time will sending data, is used and to search the first pre-coding matrix that module 202 finds and amass with the second pre-coding matrix is, and data are carried out to precoding;

Wherein, the ground floor code book of the aerial array of plane is the aerial array of plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of plane.

To sum up, the above embodiment of the application can reach following technique effect:

In the application's technical scheme, Kronecker approximation theory based on URA correlation, by the aerial array of plane is carried out to operation of direct product at the ground floor code book of the linear array of orthogonal both direction, obtain the ground floor code book of the aerial array of plane, thereby the antenna array layout for plane has built the ground floor code book in dicode basis, be applicable to the application under the antenna array layout of plane, portray well the long-time statistical characteristic of the channel of the antenna array layout that adopts plane, improved system precoding performance, for extensive antenna system provides effective CSI feedback and pre-encode operation.

The foregoing is only the application's preferred embodiment, not in order to limit the application, all within the application's spirit and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of the application's protection.

Claims (14)

1. a transmission method of channel condition information CSI in multiple-input and multiple-output mimo system, the antenna array layout of described mimo system adopts the aerial array of plane, and described method is applied to user equipment (UE), it is characterized in that, and described method comprises:

According to the CSI of the channel getting, in the ground floor code book of the aerial array of described plane, find the first corresponding pre-coding matrix and the first pre-coding matrix indication PMI, wherein, a PMI is the PMI of the first pre-coding matrix;

According to described CSI and a PMI, in the second layer code book of the aerial array of described plane, find corresponding the second pre-coding matrix and the 2nd PMI, wherein, the 2nd PMI is the PMI of the second pre-coding matrix;

The one PMI and the 2nd PMI are reported to base station;

Wherein, the ground floor code book of the aerial array of described plane is the aerial array of described plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of described plane.

2. method according to claim 1, is characterized in that, the aerial array of described plane at the ground floor code book of the axial linear array of x is:

wherein, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of x, G _xfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of x.

3. method according to claim 1, is characterized in that, the aerial array of described plane at the ground floor code book of the axial linear array of y is:

wherein, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of y, G _yfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of y.

4. method according to claim 1, is characterized in that, when the antenna element in the aerial array of described plane polarizes in the same way, each the pre-coding matrix W1 in the ground floor code book of the aerial array of described plane is:

$W1=X_{g_1}\⊗Y_{g_2},g_1=\mathrm{0,1},...,G_x-1,g_2=\mathrm{0,1},...,G_y-1,$ Wherein, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of x, G _xfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of x, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of y, G _yfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of y, for the operation of direct product symbol of matrix, the size of W1 is M ₁* N ₁, M ₁for the antenna element sum of the aerial array of described plane, N ₁>=1.

5. method according to claim 1, is characterized in that, during antenna element cross polarization in the aerial array of described plane, each the pre-coding matrix W1 in the ground floor code book of the aerial array of described plane is:

$W1=\left[\begin{array}{cc}{X}_{g_1}\⊗Y_{g_2}& 0\\ 0& X_{g_1}\⊗Y_{g_2}\end{array}\right],$ G ₁=0,1 ..., G _x-1, g ₂=0,1 ..., G _y-1, wherein, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of x, G _xfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of x, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of y, G _yfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of y, for the operation of direct product symbol of matrix, the size of W1 is M ₁* N ₁, M ₁for the antenna element sum of the aerial array of described plane, N ₁>=2.

6. according to the method described in claim 4 or 5, it is characterized in that, the size of each pre-coding matrix in the second layer code book of the aerial array of described plane is M ₂* N ₂, wherein, N ₂for the number of spatial reuse data flow, M ₂=N ₁.

7. a transmission method of the channel condition information CSI in multiple-input and multiple-output mimo system, the antenna array layout of described mimo system adopts the aerial array of plane, and described method is applied to base station, it is characterized in that, and described method comprises:

Receive the first pre-coding matrix indication PMI and the 2nd PMI of reported by user equipment UE;

According to a PMI who receives, in the ground floor code book of the aerial array of described plane, find the first corresponding pre-coding matrix, according to the 2nd PMI receiving, in the second layer code book of the aerial array of described plane, find the second corresponding pre-coding matrix;

In the time will sending data, use the first pre-coding matrix and the second pre-coding matrix long-pending, described data are carried out to precoding;

Wherein, the ground floor code book of the aerial array of described plane is the aerial array of described plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of described plane.

8. method according to claim 7, is characterized in that, the aerial array of described plane at the ground floor code book of the axial linear array of x is:

wherein, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of x, G _xfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of x.

9. method according to claim 7, is characterized in that, the aerial array of described plane at the ground floor code book of the axial linear array of y is:

wherein, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of y, G _yfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of y.

10. method according to claim 7, is characterized in that, when the antenna element in the aerial array of described plane polarizes in the same way, each the pre-coding matrix W1 in the ground floor code book of the aerial array of described plane is:

$W1=X_{g_1}\⊗Y_{g_2},g_1=\mathrm{0,1},...,G_x-1,g_2=\mathrm{0,1},...,G_y-1,$ Wherein, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of x, G _xfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of x, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of y, G _yfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of y, for the operation of direct product symbol of matrix, the size of W1 is M ₁* N ₁, M ₁for the antenna element sum of the aerial array of described plane, N ₁>=1.

11. methods according to claim 7, is characterized in that, during antenna element cross polarization in the aerial array of described plane, each the pre-coding matrix W1 in the ground floor code book of the aerial array of described plane is:

$W1=\left[\begin{array}{cc}{X}_{g_1}\⊗Y_{g_2}& 0\\ 0& X_{g_1}\⊗Y_{g_2}\end{array}\right],$ G ₁=0,1 ..., G _x-1, g ₂=0,1 ..., G _y-1, wherein, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of x, G _xfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of x, for the aerial array of the described plane pre-coding matrix in the ground floor code book of the axial linear array of y, G _yfor the aerial array of the described plane codebook size at the ground floor code book of the axial linear array of y, for the operation of direct product symbol of matrix, the size of W1 is M ₁* N ₁, M ₁for the antenna element sum of the aerial array of described plane, N ₁>=2.

12. according to the method described in claim 10 or 11, it is characterized in that, the size of each pre-coding matrix in the second layer code book of the aerial array of described plane is M ₂* N ₂, wherein, N ₂for the number of spatial reuse data flow, M ₂=N ₁.

User equipment (UE) in 13. 1 kinds of multiple-input and multiple-output mimo systems, the antenna array layout of described mimo system adopts the aerial array of plane, it is characterized in that, and described UE comprises:

Acquisition module, for obtaining the channel condition information CSI of channel;

Search module, CSI for the channel that gets according to described acquisition module, in the ground floor code book of the aerial array of described plane, find the first corresponding pre-coding matrix and the first pre-coding matrix indication PMI, wherein, a PMI is the PMI of the first pre-coding matrix; Also for according to described CSI and a PMI, in the second layer code book of the aerial array of described plane, find corresponding the second pre-coding matrix and the 2nd PMI, wherein, the 2nd PMI is the PMI of the second pre-coding matrix;

Sending module, for by search module searches to a PMI and the 2nd PMI report base station;

Wherein, the ground floor code book of the aerial array of described plane is the aerial array of described plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of described plane.

Base station in 14. 1 kinds of multiple-input and multiple-output mimo systems, the antenna array layout of described mimo system adopts the aerial array of plane, it is characterized in that, and described base station comprises:

Receiver module, for receiving the first pre-coding matrix indication PMI and the 2nd PMI of reported by user equipment UE;

Search module, for a PMI who receives according to described receiver module, in the ground floor code book of the aerial array of described plane, find the first corresponding pre-coding matrix, according to the 2nd PMI receiving, in the second layer code book of the aerial array of described plane, find the second corresponding pre-coding matrix;

Precoding module, in the time will sending data, searches the first pre-coding matrix and the second pre-coding matrix that module searches arrives described in use long-pending, and described data are carried out to precoding;

Wherein, the ground floor code book of the aerial array of described plane is the aerial array of described plane to be carried out to operation of direct product at the ground floor code book of x direction of principal axis and the axial linear array of y obtain, and x axle and y axle are respectively the straight lines at place, orthogonal two limits of the aerial array of described plane.