CN103546241A - Method and device for transmitting precoded matrix indexes and precoding - Google Patents

Abstract

An embodiment of the invention provides a method and device for transmitting precoded matrix indexes and precoding. The method for transmitting precoded matrix indexes includes allowing a user device to acquire the capacity of a transmission channel for carrying PMI; selecting a second codebook set formed by precoded matrixes from a first codebook set stored locally according to the capacity of the transmission channel for carrying the PMI; selecting a first precoded matrix from the second codebook set; transmitting the index corresponding to the first precoded matrix to a base station through the transmission channel, and allowing the base station to search for the first precoded matrix according to the index and precoding the data according to the first precoded matrix. According to the embodiment of the method, flexible configuration and usage of the PMI can be realized.

Description

The method and apparatus that sends pre-coding matrix index and carry out precoding

Technical field

The embodiment of the present invention relates to the communications field, relates in particular to a kind of method and apparatus that sends pre-coding matrix index and carry out precoding.

Background technology

In third generation partner program (3rd Generation Partnership Project3GPP) Long Term Evolution (Long Term Evolution:LTE) version 10, eight transmitting antennas will be introduced in base station, to relevant antenna configuration, there is the configuration mode of two kinds of antennas.ULA antenna configuration as shown in Figure 1, and dual-polarized antenna configuration, as shown in Figure 2.In the discussion about 8 antenna codebooks of current 3GPP, reached following consensus.Current precoding is comprised of two parts

W=W ₁W ₂ （1）

W wherein ₁belong to a codebook set C ₁, W ₂belong to another codebook set C ₂.W ₁mainly representative is broadband/long-term characteristic of channel; W ₂subband/instantaneous the characteristic of channel representing

In 3GPP LTE version 8, PMI(pre-coding matrix index, Precoding Matrix Index) information can be passed through Physical Uplink Control Channel (Physical Uplink Control CHannel, PUCCH) or Physical Uplink Shared Channel (Physical Uplink Shared CHannel PUSCH) reports.Wherein PMI information comprises at most 4 bits.

In prior art, cannot to PMI, carry out flexible configuration and use according to the situation of transmission channel.

Summary of the invention

The embodiment of the present invention provides a kind of recoding processing method, codebook set and base station, to realize the flexible configuration of PMI and use.

The embodiment of the present invention provides the method for PMI of transmission a kind of, comprising:

Subscriber equipment obtains the ability of transmission channel bearing PMI;

According to the ability of described transmission channel bearing PMI, the first codebook set of preserving from this locality, select pre-coding matrix to form the second codebook set;

From described the second codebook set, select the first pre-coding matrix;

By described transmission channel, to base station, send index corresponding to described the first pre-coding matrix, so that described base station is carried out precoding according to the first pre-coding matrix described in described index search and according to described the first pre-coding matrix to data.

The embodiment of the present invention provides a kind of subscriber equipment, comprising:

Acquiring unit, for obtaining the ability of transmission channel bearing PMI;

Selected cell, the ability of the described transmission channel bearing PMI obtaining according to described acquiring unit, selects pre-coding matrix to form second codebook set the first codebook set of preserving from this locality; And selection is used for the first pre-coding matrix that data are carried out to precoding from described the second codebook set;

Transmitting element, is carried on described transmission channel and sends for index corresponding to described the first pre-coding matrix that described selected cell is selected.

The present invention also provides a kind of method of carrying out precoding, comprising:

Receive index corresponding to the first pre-coding matrix that subscriber equipment sends by transmission channel, wherein, described the first pre-coding matrix is that described subscriber equipment is selected from the second codebook set, and described the second codebook set is that the pre-coding matrix that described subscriber equipment is selected from the first codebook set of this locality preservation forms;

This set of third yard of preserving from this locality according to described index, search described the first pre-coding matrix, and according to described the first pre-coding matrix, data are carried out to precoding, wherein, this set of described third yard is identical with described the second codebook set.

Method according to upper one, before index corresponding to the first pre-coding matrix of sending by transmission channel at described reception subscriber equipment, also comprises:

To described subscriber equipment, send for notifying the signaling of the ability of transmission channel bearing PMI described in described subscriber equipment, so that described subscriber equipment, according to the ability of described transmission channel bearing PMI, selects pre-coding matrix to form the second codebook set from described the first codebook set.

The present invention also provides a kind of base station, comprising:

Receiving element, for receiving index corresponding to the first pre-coding matrix that subscriber equipment sends by transmission channel, wherein, described the first pre-coding matrix is that described subscriber equipment is selected from the second codebook set, and described the second codebook set is that the pre-coding matrix that described subscriber equipment is selected from the first codebook set of this locality preservation forms;

Precoding unit, described the first pre-coding matrix is searched in this set of third yard of preserving from this locality for the index receiving according to described receiving element, and according to described the first pre-coding matrix, data are carried out to precoding, wherein, this set of described third yard is identical with described the second codebook set.

According to a upper base station, also comprise:

Notification unit, for sending to described subscriber equipment for notifying the signaling of the ability of transmission channel bearing PMI described in described subscriber equipment, so that described subscriber equipment, according to the ability of described transmission channel bearing PMI, selects pre-coding matrix to form the second codebook set from described the first codebook set.

In the embodiment of the present invention, can select the pre-coding matrix of different accuracy according to the ability of the transmission channel of carrying PMI, for base station, to being transferred to the data of UE, carry out precoding, thereby realized the flexible configuration of PMI and use.

Accompanying drawing explanation

Figure 1 shows that the structural representation of ULA antenna in prior art;

Figure 2 shows that the structural representation of dual polarized antenna in prior art;

Figure 3 shows that the method flow diagram of a kind of PMI of transmission that the embodiment of the present invention provides;

Figure 4 shows that a kind of method flow diagram that carries out precoding that the embodiment of the present invention provides;

Figure 5 shows that the structural representation of a kind of subscriber equipment that the embodiment of the present invention provides;

Figure 6 shows that the structural representation of a kind of base station that the embodiment of the present invention provides.

Embodiment

For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

The method flow diagram of a kind of PMI of transmission that Fig. 3 provides for the embodiment of the present invention, comprising:

Step 301, UE obtain the ability of transmission channel bearing PMI.

In the present embodiment, transmission channel refers to carrying or carries the channel of PMI, can comprise: PUCCH channel, PUSCH channel etc.The method that UE obtains the ability of transmission channel bearing PMI can comprise: receive that base station sends for notifying the signaling of the ability of described transmission channel bearing PMI, or, from the capabilities list of the transmission channel bearing PMI of this locality storage, obtain.The ability of described transmission channel bearing PMI, refers to the maximum number that can be used in the bit number of carrying PMI in this transmission channel; Such as, on PUCCH channel, PMI can carry at most 4 bits, and on PUSCH channel, PMI can carry at most 6 bits; This ability can according to transmission data need to carry out pre-configured.

Optionally, step 302, UE can, according to the ability of described transmission channel bearing PMI, select pre-coding matrix to form second codebook set the first codebook set of preserving from this locality.

Concrete, can select described the first codebook set whole according to the actual conditions of transmission channel, or select the subset of described the first codebook set as described the second codebook set.

Pre-coding matrix in the first described codebook set can be following form:

In (2), making number of transmit antennas is N _t(N _tfor even number), the order of pre-coding matrix is R, W ₁for N _tthe matrix of * 2R dimension, W ₂matrix for 2R * R.I is the unit matrix of R * R, and X is the diagonal matrix of a R * R, and D is a N _t/ 2 * N _tthe diagonal matrix of/2 dimensions, A is a N _tthe matrix of/2 * R, Λ is the diagonal matrix of a R * R.Wherein

Wherein, for dual polarized antenna as shown in Figure 2, Λ, the effect of X is all for adjusting two groups of phase relations between poliarizing antenna.A _i, b _i(i=1 ..., the scalar that is R) 1 for mould.

8 transmitting antennas of take are example, and order=1 of pre-coding matrix is example, such as arrangement mode as shown in Figure 2, D is the diagonal matrix of 4 * 4, such as representing there is T=2 with b bit ^bplant possible value.

$D\∈\left\{\left(\begin{array}{cccc}1& 0& 0& 0\\ 0& e^{\mathrm{j\πg}/8}& 0& 0\\ 0& 0& e^{2\mathrm{j\πg}/8}& 0\\ 0& 0& 0& e^{\mathrm{j\πg}/8}\end{array}\right)\right\},(g\∈0,...T-1)---\left(4\right)$

A be adopt existing based on discrete Fourier transform (Discrete Fourier Transform, hereinafter to be referred as: codebook structure DFT) obtains, and its computing formula is as follows:

$\begin{array}{c}{e}_m^{\left(g\right)}=\frac{1}{\sqrt{M}}{\left[\begin{array}{ccc}{w}_{0m}^{\left(g\right)}& ...& w_{(M-1)m}^{\left(g\right)}\end{array}\right]}^T\\ w_{\mathrm{nm}}^{\left(g\right)}=\exp \left\{\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HDA0000396337790000011.png,HDA0000396337790000012.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;n}}{M}(m+\frac{g}{G})\right\}\end{array}---\left(5\right)$

Wherein, M is the dimension of DFT, m=0,1 ... M-1, n=0,1 ... M-1, the DFT that 4 antennas are corresponding, M=4.G is the group number of DFT, g=0, and 1 ..., G-1.

the precoding vector in codebook set,

for

in each element.For instance, G=2, each 4 dimension DFT structure can be obtained the precoding vector of 44 * 1, and two DFT structures can produce the precoding vector of 84 * 1.So if represent A with 3 bits, the value of A can obtain from this precoding vector of 84 * 1.Λ is 1 * 1 matrix, and value can be the point on Unit Circle, such as representing with b bit, one has T=2 ^bplant possibility, value can be e ^{j2 π k/T}(k=0 ..., T-1).Such as, with a bit, represent, value is (1 ,-1).Λ, X is 1 * 1 matrix, value can be the point on Unit Circle, such as representing with b bit, one has T=2 ^bplant possibility, value can be e ^{j2 π k/T}(k=0 ..., T-1).

Suppose that the first codebook set one has 7 bits and represents, because D and A role can be the sending directions of adjusting wave beam, one shares 5 bits represents, suppose that D represents with a bit, in (4), g fixedly gets into 1 or-1,

$D\&Element;\{\left(\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right),\left(\begin{array}{cccc}1& 0& 0& 0\\ 0& e^{\mathrm{j\&pi;g}/8}& 0& 0\\ 0& 0& e^{2\mathrm{j\&pi;g}/8}& 0\\ 0& 0& 0& e^{3\mathrm{j\&pi;g}/8}\end{array}\right)\}---\left(6\right)$

A represents with 4 bits; What all represent with X due to Λ is the adjustment to the phase place between two groups of different poliarizing antennas, can one shares 2 bits and represents.

By adjusting D, A, Λ, the bit number of X, makes the bit number of total PMI and the bearing capacity of transmission channel consistent.Described here is consistent, and refer to and describe D, A, Λ, the bit number of the PMI that the total bit number sum of X can send with transmission channel is the same.Such as, at PUCCH channel, there are at most 4 bits to send PMI.D, A, Λ, the total bit number of X is 4.Can make UE be fixed D=I(unit matrix), X=I.A is made as 3 bit informations, and Λ is 1 bit.Be total up to the PMI of 4 bits.If PMI uploads by PUSCH, PMI can have 6 bits, D, and A, Λ, the total bit number of X is 6, can make 1 bit represent D, makes Λ be fixed as I.With 3 bits, represent A, X represents with 2 bits, comes to 6 bits and represents.If upload the PMI of 7 bits at PUSCH, can make A is 4 bits, and D is 1 bit, and X is 2 bits.From the first codebook set, choose the second codebook set, when the second codebook set is the subset of the first codebook set.Choose to such an extent that criterion is the second codebook set even division signals space of trying one's best.Such as the first codebook set one has 7 bits, but the second codebook set only has 4 bits to represent, can make D=I, A represents with 3 bit informations, can represent 8 directions (the first code book can represent 32 directions), in formula (5), can make g=0, g=2, G=4, obtains substantially uniform 8 directions.With seasonal X=I(or Λ=I, X represents with 1 bit), Λ represents with 1 bit, span 1 or-span is 1 during two bits of 1(,-1, j ,-j).

Optionally, in this step, UE also can select the codebook set that is adapted to this ability as above-mentioned the second codebook set directly according to the ability of described transmission channel bearing PMI from this locality, refer to the next embodiment of the method for the present invention.

Step 303, UE, according to the second codebook set, select first pre-coding matrix of base station for carrying out precoding.

When UE selects precoding in the second codebook set, can select according to the principle of certain setting, concrete selection principle can, with reference to prior art, can make the pre-coding matrix of data signal to noise ratio maximum as the first pre-coding matrix such as selecting one.

Step 304, by described transmission channel, to base station, send index corresponding to described the first pre-coding matrix.

Owing to need to transmit the index of selected pre-coding matrix on transmission channel, can make the respectively corresponding index of pre-coding matrixes different in this set of second code, to distinguish, represent different pre-coding matrixes.Index corresponding to described the first pre-coding matrix refer to: be pre-coding matrix in the second codebook set is set up after index, and this first pre-coding matrix corresponding numbering in this newly-established index.Such as: when using PUCCH as transmission channel, if the first codebook set comprises 32 codebook matrix, if PUCCH available 4bit transmission PMI only can select 16 codebook matrix to form the second codebook set from the first codebook set; And use 0-15(to represent with 4bit) respectively as the index of above-mentioned 16 codebook matrix; If selection is numbered 0 codebook matrix as above-mentioned the first pre-coding matrix, the index that a corresponding pre-coding matrix is corresponding can be expressed as 0000; Or if selection is numbered 2 codebook matrix as above-mentioned the first pre-coding matrix, the index that a corresponding pre-coding matrix is corresponding can be expressed as 0010.

The present embodiment, by the setting to the ability of different transmission channel bearing PMI, make the subscriber equipment can be after obtaining the ability of transmission channel, according to this channel capacity, the bit number of PMI feedback and the codebook set of use thereof are configured, and PMI is fed back to base station, thereby base station can obtain according to the bearing capacity of the transmission channel of subscriber equipment the PMI. of different accuracy

As further embodiment of this invention, said method can also be:

In advance for the ability of different transmission channel bearing PMI, different codebook sets is set, the action of selecting in step 302 in above-described embodiment can be omitted, when initial condition, exist multiple different codebook set to select for subscriber equipment, such as above-mentioned the first codebook set and the second codebook set.The main distinction of the method and above-described embodiment is, need to from the first codebook set, not select the second codebook set, but can be directly according to ability choice for use the first codebook set or the second codebook set of transmission channel bearing PMI.

Figure 4 shows that a kind of method flow diagram that carries out precoding that the embodiment of the present invention provides, comprising:

Step 401, base station receive index corresponding to the first pre-coding matrix that subscriber equipment sends by transmission channel.

In the present embodiment, the first pre-coding matrix is that described subscriber equipment is selected from the second codebook set, described the second codebook set is that the pre-coding matrix that described subscriber equipment is selected from the first codebook set of this locality preservation forms, and the concrete obtain manner of the second codebook set can be with reference to the corresponding description in embodiment illustrated in fig. 3.

Step 402, base station are according to the first pre-coding matrix described in index search corresponding to the first pre-coding matrix obtaining.

In the present embodiment, this set of third yard that can preserve from this locality according to index, search described the first pre-coding matrix, and according to described the first pre-coding matrix, data are carried out to precoding, wherein, this set of described third yard is identical with described the second codebook set.The described identical number that refers to the pre-coding matrix that this set of third yard comprises with the second codebook set is identical; And this set of third yard is identical one by one with the pre-coding matrix in the second codebook set; And what in this set of third yard and the second codebook set, same index value represented is same pre-coding matrix.

In the present embodiment, this set of described third yard can be base station according to UE for sending the ability of transmission channel or the type of this transmission channel of PMI, pre-set.Base station set up the index that in this set of third yard, each pre-coding matrix is corresponding mode and embodiment illustrated in fig. 3 in roughly the same, do not repeat them here.

Step 403, base station use obtain pre-coding matrix and carry out precoding in step 403.

The present embodiment, precoding, by the PMI of the feedback of the UE that obtains, is carried out to the data that send to UE in base station.And according to the difference of UE transmission channel bearing ability, obtain the pre-coding matrix of different accuracy.Thereby guaranteed the flexible setting to PMI, rationally utilized transmission channel resources.

One of ordinary skill in the art will appreciate that, all or part of step in the various embodiments described above can realize by the relevant hardware of program command, above-mentioned program can be stored in computer read/write memory medium, and above-mentioned storage medium can be ROM/RAM, magnetic disc, CD etc.

Figure 5 shows that the structural representation of a kind of subscriber equipment that the embodiment of the present invention provides, the method providing in said method embodiment can be provided this subscriber equipment, and this subscriber equipment comprises:

Acquiring unit 501, for obtaining the ability of transmission channel bearing PMI;

Selected cell 502, for the ability of the described transmission channel bearing PMI that obtains according to described acquiring unit 501, selects pre-coding matrix to form second codebook set the first codebook set of preserving from this locality; And selection is used for the first pre-coding matrix that data are carried out to precoding from described the second codebook set;

Transmitting element 503, is carried on described transmission channel and sends for index corresponding to described the first pre-coding matrix that described selected cell 502 is selected.

Unit module and the interactive relation of base station and the specific implementation of each Elementary Function in above-mentioned subscriber equipment, can be with reference to the description in above-mentioned Fig. 3 and embodiment of the method corresponding to Fig. 4.

The present embodiment, by the setting to the ability of different transmission channel bearing PMI, make the subscriber equipment can be after obtaining the ability of transmission channel, according to this channel capacity, the bit number of PMI feedback and the codebook set of use thereof are configured, and PMI is fed back to base station, thereby base station can obtain according to the bearing capacity of the transmission channel of subscriber equipment the PMI of different accuracy.

The structural representation of a kind of base station that Fig. 6 provides for the embodiment of the present invention, the method providing in said method embodiment can be provided in this base station, and this base station comprises:

Receiving element 601, for receiving index corresponding to the first pre-coding matrix that subscriber equipment sends by transmission channel, wherein, described the first pre-coding matrix is that described subscriber equipment is selected from the second codebook set, and described the second codebook set is that the pre-coding matrix that described subscriber equipment is selected from the first codebook set of this locality preservation forms;

Precoding unit 602, described the first pre-coding matrix is searched in this set of third yard of preserving from this locality for the index receiving according to described receiving element 601, and according to described the first pre-coding matrix, data are carried out to precoding, wherein, this set of described third yard is identical with described the second codebook set.。

As another embodiment of the present invention, this base station can also comprise:

Transmitting element 603, for sending to described subscriber equipment for notifying the signaling of the ability of transmission channel bearing PMI described in described subscriber equipment, so that described subscriber equipment, according to the ability of described transmission channel bearing PMI, selects pre-coding matrix to form the second codebook set from described the first codebook set.UE and base station also can be in advance the ability of predetermined different transmission channel bearing PMI.

Unit module and the interactive relation of subscriber equipment and the specific implementation of each Elementary Function in above-mentioned base station, can be with reference to the description in above-mentioned Fig. 3 and embodiment of the method corresponding to Fig. 4.

The present embodiment, base station can arrange the ability of feedback PMI of the different transmission channel of subscriber equipment as required, thereby obtains the PMI. of different accuracy

It should be noted that, above all or part of unit can be integrated in chip to be realized.Each functional unit in each embodiment of the present invention can be integrated in a processing module, can be also that the independent physics of unit exists, and also can be integrated in a module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.If above-mentioned integrated module usings that the form of software function module realizes and during as production marketing independently or use, also can be stored in a computer read/write memory medium.The above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.

Accompanying drawing and associated description, just for principle of the present invention is described, are not intended to limit protection scope of the present invention.For example, the message name in various embodiments of the present invention and entity can change to some extent according to the difference of network, and some message also can be omitted.Therefore, all any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., be all included in protection scope of the present invention.

Although by with reference to some preferred embodiment of the present invention, the present invention is illustrated and described, those of ordinary skill in the art should be understood that and can to it, do various changes in the form and details, and without departing from the spirit and scope of the present invention.

Claims (24)

1. send a method for pre-coding matrix index (PMI), it is characterized in that,

Subscriber equipment is selected the first pre-coding matrix from the second codebook set, and wherein, described the second codebook set is according to the capabilities setting of transmission channel bearing PMI;

Described subscriber equipment sends index corresponding to described the first pre-coding matrix to base station by described transmission channel, so that described base station is carried out precoding according to the first pre-coding matrix described in described index search and according to described the first pre-coding matrix to data.

2. method according to claim 1, is characterized in that, described the second codebook set is according to the capabilities setting of transmission channel bearing PMI, comprising:

Described the second codebook set is that described subscriber equipment selects pre-coding matrix to form from the first codebook set of this locality preservation according to the ability of the described transmission channel bearing PMI obtaining, and described the second codebook set is the whole or subset of described the first codebook set.

3. method according to claim 2, is characterized in that, when described the second codebook set is the subset of the first codebook set, described the second codebook set meets the evenly criterion in division signals space.

4. according to the method in claim 2 or 3, it is characterized in that, in described local the first codebook set of preserving, any one pre-coding matrix is expressed as W=W ₁w ₂,

Wherein, $W_1=\left(\begin{array}{cc}\mathrm{DA}& 0\\ 0& \mathrm{DA\&Lambda;}\end{array}\right),$ $W_2=\left(\begin{array}{c}I\\ X\end{array}\right),$ W ₁for N _tthe matrix of * 2R, W ₂matrix for 2R * R; I is the unit matrix of R * R, and X is the diagonal matrix of a R * R, and D is a N _t/ 2 * N _t/ 2 diagonal matrix, A is a N _tthe matrix of/2 * R, Λ is the diagonal matrix of a R * R, wherein, N _tfor even number and represent the transmitting antenna number of described base station, the order that R is described pre-coding matrix.

5. method according to claim 4, when order equals 1, and described the second codebook set subset that is the first codebook set, and D, X are while equaling unit matrix, comprising:

Λ represents with 1 bit, span 1 or-1.

6. method according to claim 4, when order equals 1, and the second codebook set is the subset of the first codebook set, and D, X are while equaling unit matrix, comprising:

A represents 8 uniform directions with 3 bit informations.

7. carry out a method for precoding, it is characterized in that, comprising:

Base station receives index corresponding to the first pre-coding matrix that subscriber equipment sends by transmission channel, wherein, described the first pre-coding matrix is that described subscriber equipment is selected from the second codebook set, and described the second codebook set is according to the capabilities setting of described transmission channel bearing PMI;

This set of third yard that preserve from this locality according to described index described base station, search described the first pre-coding matrix, and according to described the first pre-coding matrix, data are carried out to precoding, wherein, this set of described third yard is identical with described the second codebook set.

8. method according to claim 7, is characterized in that, described the second codebook set is the whole or subset of the first codebook set of described subscriber equipment preservation.

9. method according to claim 8, is characterized in that, when described the second codebook set is the subset of the first codebook set, described the second codebook set meets the evenly criterion in division signals space.

10. method according to claim 8 or claim 9, is characterized in that, in described the first codebook set, any one pre-coding matrix is expressed as W=W ₁w ₂,

Wherein, $W_1=\left(\begin{array}{cc}\mathrm{DA}& 0\\ 0& \mathrm{DA\&Lambda;}\end{array}\right),$ $W_2=\left(\begin{array}{c}I\\ X\end{array}\right),$ W ₁for N _tthe matrix of * 2R, W ₂matrix for 2R * R; I is the unit matrix of R * R, and X is the diagonal matrix of a R * R, and D is a N _t/ 2 * N _t/ 2 diagonal matrix, A is a N _tthe matrix of/2 * R, Λ is the diagonal matrix of a R * R, wherein, N _tfor even number and represent the transmitting antenna number of described base station, the order that R is described pre-coding matrix.

11. methods according to claim 10, when order equals 1, and described the second codebook set subset that is the first codebook set, and D, X are while equaling unit matrix, comprising:

Λ represents with 1 bit, span 1 or-1.

12. methods according to claim 10, when order equals 1, and the second codebook set is the subset of the first codebook set, and D, X are while equaling unit matrix, comprising:

A represents 8 uniform directions with 3 bit informations.

13. 1 kinds of subscriber equipmenies, is characterized in that, comprising:

Selected cell, for selecting the first pre-coding matrix from the second codebook set, wherein, described the second codebook set is according to the capabilities setting of described transmission channel bearing PMI;

Transmitting element, for send index corresponding to described the first pre-coding matrix to base station by described transmission channel, so that described base station is carried out precoding according to the first pre-coding matrix described in described index search and according to described the first pre-coding matrix to data.

14. subscriber equipmenies according to claim 13, is characterized in that, described the second codebook set is according to the capabilities setting of transmission channel bearing PMI, comprising:

Described the second codebook set is that described subscriber equipment selects pre-coding matrix to form from the first codebook set of this locality preservation according to the ability of the described transmission channel bearing PMI obtaining, and described the second codebook set is the whole or subset of described the first codebook set.

15. subscriber equipmenies according to claim 14, is characterized in that, when described the second codebook set is the subset of the first codebook set, described the second codebook set meets the evenly criterion in division signals space.

16. according to the subscriber equipment described in claims 14 or 15, it is characterized in that, in described the first codebook set, any one pre-coding matrix is expressed as W=W ₁w ₂,

Wherein, $W_1=\left(\begin{array}{cc}\mathrm{DA}& 0\\ 0& \mathrm{DA\&Lambda;}\end{array}\right),$ $W_2=\left(\begin{array}{c}I\\ X\end{array}\right),$ W ₁for N _tthe matrix of * 2R, W ₂matrix for 2R * R; I is the unit matrix of R * R, and X is the diagonal matrix of a R * R, and D is a N _t/ 2 * N _t/ 2 diagonal matrix, A is a N _tthe matrix of/2 * R, Λ is the diagonal matrix of a R * R, wherein, N _tfor even number and represent the transmitting antenna number of described base station, the order that R is described pre-coding matrix.

17. subscriber equipmenies according to claim 16, when order equals 1, and described the second codebook set subset that is the first codebook set, and D, X are while equaling unit matrix, comprising:

Λ represents with 1 bit, span 1 or-1.

18. subscriber equipmenies according to claim 16, when order equals 1, and the second codebook set is the subset of the first codebook set, and D, X are while equaling unit matrix, comprising:

A represents 8 uniform directions with 3 bit informations.

19. 1 kinds of base stations, is characterized in that, comprising:

Receiving element, for receiving index corresponding to the first pre-coding matrix that subscriber equipment sends by transmission channel, wherein, described the first pre-coding matrix is that described subscriber equipment is selected from the second codebook set, and described the second codebook set is according to the capabilities setting of described transmission channel bearing PMI;

Precoding unit, described the first pre-coding matrix is searched in this set of third yard of preserving from described base station for the index receiving according to described receiving element, and according to described the first pre-coding matrix, data are carried out to precoding, wherein, this set of described third yard is identical with described the second codebook set.

20. base stations according to claim 19, is characterized in that, described the second codebook set is the whole or subset of local the first codebook set preserved of described subscriber equipment.

21. base stations according to claim 20, is characterized in that, when described the second codebook set is the subset of the first codebook set, described the second codebook set meets the evenly criterion in division signals space.

22. according to the base station described in claim 20 or 21, it is characterized in that, in described the first codebook set, any one pre-coding matrix is expressed as W=W ₁w ₂,

Wherein, $W_1=\left(\begin{array}{cc}\mathrm{DA}& 0\\ 0& \mathrm{DA\&Lambda;}\end{array}\right),$ $W_2=\left(\begin{array}{c}I\\ X\end{array}\right),$ W ₁for N _tthe matrix of * 2R, W ₂matrix for 2R * R; I is the unit matrix of R * R, and X is the diagonal matrix of a R * R, and D is a N _t/ 2 * N _t/ 2 diagonal matrix, A is a N _tthe matrix of/2 * R, Λ is the diagonal matrix of a R * R, wherein, N _tfor even number and represent the transmitting antenna number of described base station, the order that R is described pre-coding matrix.

23. base stations according to claim 22, when order equals 1, and described the second codebook set subset that is the first codebook set, and D, X are while equaling unit matrix, comprising:

Λ represents with 1 bit, span 1 or-1.

24. base stations according to claim 22, when order equals 1, and the second codebook set is the subset of the first codebook set, and D, X are while equaling unit matrix, comprising:

A represents 8 uniform directions with 3 bit informations.

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