WO2011000156A1

WO2011000156A1 - Method and device for feeding back channel information and acquiring channel matrix

Info

Publication number: WO2011000156A1
Application number: PCT/CN2009/072571
Authority: WO
Inventors: 张兴炜
Original assignee: 华为技术有限公司
Priority date: 2009-07-01
Filing date: 2009-07-01
Publication date: 2011-01-06
Also published as: CN102239711A; CN102239711B

Abstract

A method and a device for feeding back channel information and acquiring channel matrix are provided. The method for feeding back channel information includes: the channel matrix of the first link is selected to be regarded as a reference matrix, and said first link consists of a first antenna in the base station side and a second antenna in the terminal side and the spatial propagation channel between them; a ratio of the mismatch parameters for representing the relationship between the channel matrix of the second link and the reference matrix is acquired, and said second link includes: at least one link consisting of the first antenna and at least one antenna excepting the second antenna in the terminal side and the corresponding spatial propagation channel, and at least one link consisting of the second antenna and at least one antenna excepting the first antenna in the base station side and the corresponding spatial propagation channel; the ratio of the reference matrix and the mismatch parameter is fed back to the base station. The embodiment of the present invention can save the overhead for feeding back channel information.

Description

Feedback channel information and method and apparatus for acquiring channel matrix

Technical field

The present invention relates to mobile communication technologies, and in particular, to a method and apparatus for feeding back channel information and acquiring a channel matrix. Background technique

The Long Term Evolution (LTE) system improves and enhances the 3G air access technology. It uses Orthogonal Frequency Division Multiplexing (OFDM) technology and Multiple Input Multiple Output (MIMO). ) Technology to improve system performance. In the OFDM system, each user is allocated a number of subcarriers, and the channel information on each subcarrier is fed back by the user to implement efficient resource scheduling and improve spectrum resource utilization. In a MIMO system, a base station and a terminal are each provided with a plurality of antennas (in a broad sense, the MIMO system also includes a downlink MISO or an uplink SIMO system in which a plurality of antennas are set on the base station side and a single antenna is provided on the terminal side). Suppose the number of antennas of the base station is m, the number of antennas of the terminal is n, the transmission mismatch parameter of the ith antenna of the base station on the kth subcarrier is M ( ), and the jth antenna of the terminal exists on the kth subcarrier. The receiving mismatch parameter is M _RU (J, k , then the spatial channel matrix H _DL of the link formed by the i-th antenna of the base station and the j-th antenna of the terminal on the k-th subcarrier (j, j, k is

H _dl a, j, k) = M _te a, k) x H _p a, j, k) χ M _ru (j, k) , where H _p a, j, k) is the propagation channel moment P. In the prior art, there is a direct channel feedback (DCFB) scheme, which feeds back the spatial channel matrix on each link calculated according to the above manner to the base station. Under the above assumptions, the DCFB scheme needs The number of channel matrices fed back is wx «. The feedback overhead of the way of feeding back the channel matrix on each link is very large. Summary of the invention Embodiments of the present invention provide a method and apparatus for feeding back channel information and acquiring a channel matrix to reduce the overhead of the feedback channel matrix.

The embodiment of the invention provides a method for feeding back channel information, including:

Selecting a channel matrix of the first link as a reference matrix, wherein the first link is composed of a first antenna on the base station side and a second antenna on the terminal side and a spatial propagation channel between the two links;

Obtaining a ratio of a mismatch parameter for characterizing a relationship between a channel matrix of the second link and a reference matrix, where the second link includes: at least one antenna other than the second antenna by the first antenna and the terminal side And at least one link composed of a corresponding spatial propagation channel, and at least one link consisting of at least one antenna other than the first antenna and a corresponding spatial propagation channel by the second antenna and the base station side; feeding back the reference matrix The ratio to the mismatch parameter is given to the base station.

An embodiment of the present invention provides a method for acquiring a channel matrix, including:

Receiving, by the terminal device, a ratio of a reference matrix and a mismatch parameter, where the reference matrix is a selected channel matrix of the first link, and the ratio of the mismatch parameter is used to represent a channel matrix of the second link and a reference matrix The first link is composed of a first antenna on the base station side and a second antenna on the terminal side and a spatial propagation channel between the two, and the second link includes: dividing by the first antenna and the terminal side At least one antenna other than the second antenna and at least one link composed of a corresponding spatial propagation channel, and at least one antenna and a corresponding spatial propagation channel formed by the second antenna and the base station side except the first antenna At least one link;

A channel matrix of all links is obtained according to a ratio of the reference matrix and the mismatch parameter.

An embodiment of the present invention provides an apparatus for feeding back channel information, including:

a selection module, configured to select a channel matrix of the first link as a reference matrix, where the first link is composed of a first antenna on the base station side and a second antenna on the terminal side and a spatial propagation channel between the two links; And a ratio of a mismatch parameter for identifying a relationship between a channel matrix of the second link and a reference matrix, where the second link includes: at least a second antenna and a terminal side except the second antenna At least one link consisting of a single antenna and a corresponding spatial propagation channel, and at least one antenna and a corresponding spatial propagation channel composed of the second antenna and the base station side except the first antenna One less link;

And a feedback module, configured to feed back a ratio of the reference matrix and the mismatch parameter to the base station.

An embodiment of the present invention provides an apparatus for acquiring a channel matrix, including:

a receiving module, configured to receive a ratio of a reference matrix and a mismatch parameter sent by the terminal device, where the reference matrix is a channel matrix of the selected first link, and a ratio of the mismatch parameter is used to represent a channel of the second link a relationship between the matrix and the reference matrix, the first link is composed of a first antenna on the base station side and a second antenna on the terminal side and a spatial propagation channel between the two, the second link includes: And at least one antenna composed of at least one antenna other than the second antenna and the corresponding spatial propagation channel, and at least one antenna other than the first antenna and the corresponding antenna by the second antenna and the base station side At least one link consisting of a spatial propagation channel;

And a calculation module, configured to acquire a channel matrix of all links according to a ratio of the reference matrix and the mismatch parameter. According to the foregoing technical solution, the embodiment of the present invention can reduce the ratio of the mismatch parameters of the relationship between the channel matrix of the remaining links and the reference matrix by feeding back a reference matrix, and can occupy less resources when the channel information is fed back. Overhead. DRAWINGS

FIG. 1 is a schematic flowchart diagram of a first method according to an embodiment of the present disclosure;

2 is a schematic flowchart of a second method according to an embodiment of the present invention;

FIG. 3 is a schematic flowchart diagram of a third method according to an embodiment of the present disclosure;

4 is a schematic flowchart of a fourth method according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart diagram of a fifth method according to an embodiment of the present disclosure;

FIG. 6 is a schematic flowchart diagram of a sixth method according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a first device according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a second device according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a system according to an embodiment of the present invention. detailed description

The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. FIG. 1 is a schematic flowchart of a first method according to an embodiment of the present invention, including:

Step 11: The terminal device selects a channel matrix of the first link as a reference matrix, and the first chain routes a first antenna on the base station side and a second antenna on the terminal side and a spatial propagation channel between the two.

Assuming that the number of antennas of the base station is m and the number of antennas of the terminal is n, each link is composed of one antenna i (first antenna) on the base station side, one antenna j (second antenna) on the terminal side, and antenna i The spatial propagation channel composition between (first antenna) and antenna j (second antenna), under the above assumptions, mxn links can be formed in the system. The terminal device can arbitrarily select one of the m x n links as the first link.

Step 12: The terminal device acquires a ratio of a mismatch parameter for characterizing a relationship between a channel matrix of the second link and a reference matrix, where the second link includes: dividing the second antenna by the first antenna and the terminal side. At least one antenna consisting of at least one antenna and a corresponding spatial propagation channel, and at least one link consisting of the second antenna and the base station side except at least one antenna other than the first antenna and a corresponding spatial propagation channel, For example, the second link includes each link composed of a first antenna and a terminal side other than the second antenna and a corresponding spatial propagation channel, and the second antenna and the base station side are divided by the first antenna. Each of the antennas and the corresponding spatial propagation channel;

Step 13: The terminal device feeds back the ratio of the reference matrix and the mismatch parameter to the base station.

In this embodiment, by comparing a reference matrix and a ratio of mismatch parameters that characterize the relationship between the channel matrix of the remaining links and the reference matrix, less resource feedback channel information can be occupied, and overhead is reduced. The terminal device may obtain a mismatch parameter of a channel matrix of the second link and a mismatch parameter with the reference matrix, and compare the two mismatch parameters to obtain a channel matrix between the reference matrix and the reference matrix. The ratio of the mismatch parameters of the relationship. How the terminal device obtains the mismatch parameter of the channel matrix of each link is a prior art, and details are not described herein. 2 is a schematic flowchart of a second method according to an embodiment of the present invention, including: Step 21: A base station receives a ratio of a reference matrix and a mismatch parameter sent by a terminal device, where the reference matrix is a channel matrix of the selected first link. The ratio of the mismatch parameter is used to represent a relationship between a channel matrix of the second link and a reference matrix, and the first link is between the first antenna on the base station side and the second antenna on the terminal side And the second link includes: at least one link composed of the first antenna and the terminal side except at least one antenna other than the second antenna and the corresponding spatial propagation channel, and the second antenna And at least one link composed of at least one antenna other than the first antenna and a corresponding spatial propagation channel on the base station side;

Step 22: The base station acquires a channel matrix of all links according to a ratio of the reference matrix and the mismatch parameter.

In this embodiment, according to the reference matrix and the ratio of the mismatch parameters that characterize the relationship between the channel matrix of the remaining links and the reference matrix, the channel matrix of each link can be calculated, and the channel matrix of each link can be obtained by occupying less resources. .

In the following embodiments, the base station and the terminal device are respectively exemplified by an evolved base station (eNB) and a user equipment (UE) in the LTE. It can be understood that the following embodiments can also be applied to other In the system.

For simplicity of description, in the following embodiments, a chain (i, j) is used to indicate a transmit and receive (Tx/Rx) link composed of an ith antenna of the eNB and a jth antenna of the UE, where i=l, .. m, j=l,...n, m, n are the number of antennas set on the eNB and the number of antennas set on the UE, respectively, and the antennas set on the eNB side are respectively represented by the eNB antenna 1 and the eNB antenna m. The antennas set on the UE side are respectively represented by UE antenna 1 and UE antenna n.

In the following embodiments, H(i, j) is used to represent the channel matrix of the link chain(i, j) on a certain subcarrier. The formula for calculating H(i, j) is: H ( , j, = Μ _ΤΕ ή χ H _p i, j, x M _RU U,

Where M _re (0 is the transmit antenna mismatch parameter of the ith antenna of the eNB on the subcarrier, and M _R is the receive antenna mismatch parameter of the jth antenna of the UE on the subcarrier, H _p ( , ') is the propagation channel matrix of the link chain(i, j) on this subcarrier. The following embodiment is based on the following theorem: when the distance between the two antennas constituting the antenna array is small (for example, less than half the wavelength of the current subcarrier), the two antennas are generated due to the mutual coupling effect between the antennas. The effect of transmitting or receiving is equivalent to the effect of an antenna transmitting or receiving. Therefore, the propagation channel matrix between the two antennas and the same transmitting or receiving antenna at the other end can be considered to be approximated. For example, if the distance between the il root and the i2th antenna of the eNB is small, the il antenna and The i2th antenna is approximately equal to the propagation channel matrix of the link composed of the jth antenna of the UE, that is, H _p ( l, O) « H _p ( 2, O). Similarly, if the distance between the j1th root and the j2th antenna of the UE is small, the propagation channel moment P of the link formed by the j1th antenna and the j2th antenna respectively and the ith antenna of the eNB are approximately equal. , ie H _p ( 0, jl) - H _p ( 0, jl).

The specific embodiments are described separately below:

FIG. 3 is a schematic flowchart of a third method according to an embodiment of the present invention. In this embodiment, a link chain (1, 1) is used as a first link, and a ratio of mismatch parameters is an eNB antenna 2 to an eNB antenna m and an eNB. The ratio of the mismatch parameters of the antenna 1 and the ratio of the UE antenna 2 to UE antenna n to the mismatch parameter of the UE antenna 1 are examples. Referring to FIG. 3, this embodiment includes:

Step 301: The UE uses the channel matrix of the chain (1, 1) link as a reference matrix. The matrix H(l,l) is used as the reference matrix.

Step 302: The UE calculates a ratio of mismatch parameters that characterize the relationship between the channel matrix of the second link and the reference matrix, that is, calculates a ratio of the eNB antenna 2 eNB antenna m to the mismatch parameter of the eNB antenna 1 and the UE. The ratio of the antenna 2 to the UE antenna n to the mismatch parameter of the UE antenna 1 respectively.

The second link includes a link composed of an antenna other than the first antenna of the UE by the first antenna of the eNB, and an antenna other than the first antenna of the eNB and the first antenna of the UE, respectively. The composed link, that is, the second link includes chain(1, j) (j=2, ..., η) and chain(i, 1) (i=2, · .., m ).

It is assumed that four antennas are provided on the eNB and two antennas are provided on the UE.

Calculate the formula based on the above channel matrix The channel matrix for each link can be obtained as shown in Table 1:

Table 1 Channel matrix UE antenna 1 UE antenna 2 eNB antenna 1 H{\,\)^M _TE {\)H _p {\,\)M _RU (\) H(\,2) = M _TE (\)H _p ( \,2)M _RU (2) eNB antenna 2 H{2,\)^M _TE {2)H _p {2,\)M _RU {\) H(2,2) = M _TE (2)H _p (2,2) M _RU (2) eNB antenna 3 H{2>,\)^M _TE {2>)H _p {2>,\)M _RU {\) H(3,2) = M _TE ( 3) H _p (3,2) M _RU (2) eNB antenna 4 H{ ,\)^M _TE { )H _p { ,\)M _RU {\) H(4,2) = M _TE (4) H _p (4,2) M _RU (2) It is assumed that the distance between the antennas of the antenna array of the eNB and the UE is both small (for example, less than half the wavelength of the current subcarrier), according to the above theorem, one side The two antennas are approximately equal to the propagation channel matrix of the link composed of the same antenna on the other side.

That is, H _p (1, j) « H _p (2, j)^-^H _p (m, j) , H _p « H _p (i, 2) ---H, (i, n).

In the case where the above-mentioned propagation channel matrices are approximately equal, it is possible to obtain a coefficient relationship between the channel matrices, that is, a ratio of antenna mismatch parameters.

In order to avoid the problem that the resource overhead caused by the channel matrix of each link is relatively large, the UE in this embodiment can feed back the ratio of the reference matrix and the mismatch parameter, and the eNB can recover each according to the ratio of the mismatch parameter and the reference matrix. Channel matrix.

Step 303: The UE feeds back the ratio of the reference matrix and the mismatched parameters obtained above to the eNB. Specifically, for the link chain (l, l), the channel matrix H(l, l) of the link is still fed back, the link chain (lj) (j=2, ..., n) and the chain (i, l) (i=2,...,m) feeds back the ratio of mismatch parameters of the corresponding link, while the remaining links may not feed back related information. That is, the feedback information fed back by each link can be shown in Table 2:

Table 2

Feedback information UE antenna 1 UE antenna 2

eNB antenna 1 H(l,l) = _r£ (1)^(1,1)^ ^(1) eNB antenna 2 1

eNB antenna 3 1

()

eNB antenna 4 1

M _TE (1) The above method is extended to the scenario where the number of eNB antennas is m and the number of UE antennas is n. The feedback information that needs to be fed back for each link of the interface in ^ can be as shown in Table 3:

table 3

Step 304: The eNB obtains a channel matrix of each link according to the feedback information.

After the eNB receives the feedback information, it needs to do the following calculations:

For the link chain ( l , 1), it can be obtained directly, that is, the reference matrix H(l, l) of the feedback; for the link chain (i, 1), the channel matrix H(U) can be based on the link chain (i, 1) The ratio of the feedback is multiplied by the reference matrix. The calculation formula is:

H(U) = β{ίλ) χ H(l,l) , i=2, ... ,m;

The channel matrix H(l, ) for the link chain(l, j) can be obtained by multiplying the ratio of the feedback of the link chain(l, j) with the reference matrix. The calculation formula is:

The channel matrix of the link chain(i, j) can be obtained by multiplying the ratio of the link chain(i, 1) and the link chain(l, j) feedback with the reference matrix. The calculation formula is: Η(ί, /) = β(ί,ϊ) χ β(1, /) χ Η(1,ϊ) , i=2,...,m, j=2,...,n.

The calculation method for the eNB to recover the channel matrix of each link according to the feedback information can be as shown in Table 4:

Table 4

In this embodiment, all the channel matrices can be recovered by the above calculation, and the same effect as DCFB is achieved, but compared with DCFB, this embodiment only needs to feed back a channel matrix and m+n-2 values, and DCFB needs feedback x. Compared with the "matrix matrix", the bit overhead occupied by the feedback can be reduced, and the air interface resources are greatly saved; and the embodiment is more suitable for the scene of the circular array antenna.

In the third embodiment, all antennas use the channel matrix of the link chain (l, 1) as a reference, and feedback the ratio of the mismatch parameters characterizing the relationship between the corresponding channel matrix and the reference matrix. This is well satisfied with the condition that the distance between the elements of the circular array antenna or the antenna array is small. However, for a line antenna, only adjacent antennas can satisfy a small pitch. For example, antenna 1 and antenna 2 are separated by less than half a wavelength, and antenna 2 and antenna 3 are separated by less than half a wavelength, but the spacing between antenna 1 and antenna 3 may be I am not satisfied with the conditions. At this time, it is necessary to obtain the ratio of the mismatch parameters characterizing the relationship between the channel matrices of the adjacent links, instead of using the ratio of the mismatch parameters in relation to the reference matrix.

4 is a schematic flowchart of a fourth method according to an embodiment of the present invention. In this embodiment, a first link is a link chain (1, 1), and a ratio of mismatch parameters is an eNB side based on eNB antenna 1. The ratio of the ratio of mismatch parameters between adjacent antennas and the ratio of mismatch parameters between adjacent antennas on the UE side based on UE antenna 1 is an example. Referring to FIG. 4, this embodiment includes:

Step 401: The UE uses the channel matrix of the chain (1, 1) link as a reference matrix. The matrix H(l,l) is used as the reference matrix. Step 402: The UE calculates a ratio of mismatch parameters between adjacent antennas based on the antennas in the first link, that is, calculates a mismatch parameter between adjacent antennas on the eNB side based on the eNB antenna 1. The ratio of the ratio to the mismatch parameter between adjacent antennas on the UE side based on the UE antenna 1.

Step 403: The UE feeds back the ratio of the reference matrix (H(l, l)) and each of the mismatch parameters described above to the eNB.

Specifically, for the link chain (l, l), the channel matrix H(l, l) of the link is still fed back, the link chain (lj) (j=2, ..., n) and the chain (i, l) ( i=2,...,m ) feeds back the ratio of the corresponding link to the mismatch parameter of the adjacent link, while the remaining links may not feed back the relevant information. That is, the feedback information fed back by each link can be as shown in Table 5:

table 5

Step 404: The eNB obtains a channel matrix of each link according to the feedback information. The channel matrix of the link chain (l, 1) can be directly obtained, that is, the reference matrix of feedback ^(1,1);

The channel matrix of the link chain (i, 1) can be obtained by calculating the channel matrix of the adjacent link chain (i-1, 1).

The channel matrix of the link chain (l, j) can be obtained by calculating the channel matrix of the adjacent link chain (l, j-1).

The channel matrix calculation method for the link chain(i, j) can be as follows:

Method 1: Calculate the channel matrix of the link chain (2, l) to the link chain (i, l) in turn, and then calculate the channel matrix of the link chain (i, 2) to the link chain (i, j) in turn;

Method 2: Calculate the channel matrix of the link chain (l, 2) to the link chain (l, j) in turn, and then calculate the channel matrix of the link chain (2, j) to the link chain (i, j) in turn;

Method 3: Obtain the channel matrix according to Method 1 and Method 2, respectively, and then obtain the geometric average or arithmetic average.

The calculation method for the eNB to recover the channel matrix of each link according to the feedback information can be as shown in Table 6: Table 6

The eNB calculates the channel matrix sequentially, and calculates the channel matrix of the adjacent link according to the sequentially calculated channel matrix. It can be understood that the eNB may directly directly calculate the feedback value and the reference matrix of each link. Directly calculate the channel matrix of the link, namely:

The calculation formula for the channel matrix of the link chain(i, 1) is:

H(U) = β{ίλ) χ β(ί - 1,1) χ · · · χ β(2,ϊ) χ H(l,l) , i=2, · .. ,m;

The calculation formula for the channel matrix of the link chain(l, j) is:

H(l, j) = β(\, j) χ β(\, 7 - 1) χ · · · χ β(\,2) χ H(l,l) , j=2, ... ,η ;

The calculation formula for the channel matrix of the link chain(i, j) is:

H(i, j) =

χ H(l,l) , i=2,...,m, j=2,...,n.

The previous method of sequentially calculating the channel matrix can avoid repeated operations and reduce the amount of calculation. This method of directly calculating the link channel matrix according to the feedback value of each link and the reference matrix has a good avoidance effect on error transmission and achieves accurate Improvement, in practice, can be a combination of these two methods, a compromise between the amount of calculation and accuracy.

In this embodiment, all the channel matrices can be recovered by the above calculation, and the same effect as DCFB is achieved, but compared with DCFB, this embodiment only needs to feed back a channel matrix and m+n-2 values, and DCFB needs feedback x. Compared with the "matrix matrix", the bit overhead occupied by the feedback can be reduced, and the air interface resources are greatly saved; and the embodiment is more suitable for the scene of the line array antenna.

In the third and fourth embodiments, the channel matrix of the link chain (l, 1) is used as a reference, and it can be understood that the channel matrix of any one link can be used as the reference matrix. In order to make better use of channel correlation, the reference matrix can be taken as the channel matrix of the link composed of the intermediate antennas.

FIG. 5 is a schematic flowchart of a fifth method according to an embodiment of the present invention. Different from the third embodiment, this embodiment uses a channel matrix of a link chain ( ) as a reference matrix. See Figure 5,

This embodiment includes:

The channel matrix of the link is used as a reference matrix. In the moment, L*" means rounding down, that is, taking the most

Large integer.

Step 502: The UE calculates, by using the antennas that represent the relationship between the channel matrix of the second link and the reference matrix.

Antennas other than

First

The link composed of the antenna and the link composed of the first antenna of the UE and the eNB except the antenna, that is, the second +1, ..., n) and the chain(i.) (i=l,... ,

Step 503: The UE feeds back the ratio of the reference matrix and the mismatched parameters obtained above to the eNB _t specific link chain (

+l,...,m) feeds back the ratio of the mismatch parameters of the corresponding link, while the remaining links may not feed back related information. That is, the feedback information fed back by each link can be as shown in Table 7:

Table 7

Feedback information UE antenna 1 • · ' n

UE antenna • · ' UE antenna n eNB antenna 1 1 1 1 1

β(1

Step 504: The eNB obtains a channel matrix of each link according to the feedback information.

For the link chain (; - ) can be obtained directly, that is, the reference matrix of feedback H (

The channel matrix of the link chain(i _: - ) can be obtained by multiplying the ratio of the link chain(i::) feedback and the reference matrix by the following formula:

H(i, ) x H( +l,...,m;

The ratio of the channel matrix of the link chain ( , j) to the feedback of the link chain ( , j)

Multiply by the reference matrix ^

+l,...,n;

The channel matrix for the link chain(i, j) can be based on the link chain(i _: ;) and the link. The ratio of the chain( , j) feedback is multiplied by the reference matrix

+l,...,m 2 w 2 +l,...,n.

The calculation method for the eNB to recover the channel matrix of each link according to the feedback information can be as shown in Table 8:

Table 8

In this embodiment, all the channel matrices can be recovered by the above calculation, and the same effect as DCFB is achieved, but compared with DCFB, this embodiment only needs to feed back a channel matrix and m+n-2 values, and DCFB needs feedback x. Compared with the "matrix matrix", the bit overhead occupied by the feedback can be reduced, and the air interface resources are greatly saved; and, in this embodiment, the intermediate antenna element is used as a reference, and Make good use of channel correlation.

FIG. 6 is a schematic flowchart of a sixth method according to an embodiment of the present invention. Different from the fourth embodiment, this embodiment uses a channel matrix of a link chain ( ) as a reference matrix. See Figure 6,

This embodiment includes:

Step 601: The UE uses a channel matrix of the chain ( ) link as a reference matrix. Moment

Array) as a reference matrix.

602: The UE calculates a ratio of mismatch parameters between adjacent antennas based on the antennas in the first link, that is, between the adjacent antennas on the eNB side based on the eNB antenna.

The ratio of the mismatch parameter and the ratio of mismatch parameters between adjacent antennas on the UE side based on the UE antenna.

The second link includes the antennas of the eNB and the UE except the |W 2 antennas

Antenna composed of antennas and chains (i. Step 60 specific link chain (

+l,...,m) feedback the ratio β of the mismatch parameter of the corresponding link, while the remaining links may not be reversed Feed relevant information. That is, the feedback information of each link feedback can be as shown in Table 9:

Table 9

Step 604: The eNB obtains a channel matrix of each link according to the feedback information.

winter

For the link chain (;) can be directly obtained, that is, the reference matrix of feedback H ( )

For the channel matrix of the link chain (i _: ), the channel matrix of the adjacent link can be calculated in turn.

For the channel matrix of the link chain ( , j), the channel matrix of the adjacent link can be calculated sequentially

The channel matrix calculation method for link chain(i, j) can be as follows (assuming i>

Method 1: Calculate the channel moment of the link chain( ) to the link chain(i _: :)

Array, and then calculate the channel matrix of the link chain ( +1) to the link chain (i, j); Method 2: Calculate the channel matrix of the link chain ( +1) to the link chain ( , j) in turn:

Then calculate the channel matrix of the link chain (+l, j) to the link chain (i, j) in turn;

Method 3: Obtain the channel matrix according to Method 1 and Method 2, respectively, and then obtain the geometric mean or the average of the processing.

When i< , or j<, the calculation method of recovering the channel matrix of each link according to the feedback information by using the above three methods can be similarly calculated as shown in Table 10:

Table 10

The eNB calculates the channel matrix sequentially, and calculates the channel matrix of the adjacent link according to the sequentially calculated channel matrix. It can be understood that the channel matrix of the link can be directly calculated according to the feedback value of each link and the reference matrix. , which is:

The calculation formula for the channel matrix of the link chain(i.) is:

), i= +l,...,m;

H(i, )χ-χβ( ) _X H( ), i=l,..., -1: The calculation formula of the channel matrix of the link chain(j) is:

When +l,..

= A Ι)χβ( ]-ί)χ-χβ(

When j=l,..., -1,

The calculation formula for the channel matrix of the link chain(i, j) is:

)

In this embodiment, all the channel matrices can be recovered by the above calculation, and the same effect as DCFB is achieved, but compared with DCFB, this embodiment only needs to feed back a channel matrix and m+n-2 values, and DCFB needs feedback x. Compared with the "matrix matrix", the bit overhead occupied by the feedback can be reduced, and the air interface resources are greatly saved. This embodiment can better satisfy the channel correlation, and the embodiment can also make the base station side perform the restoration of the channel matrix. The amount of calculation is minimal.

The third to sixth embodiments are based on the case where the UE has multiple antennas and the correlation between multiple antennas. When the UE has one antenna or multiple antennas and multiple antennas are not related, that is, two of the multiple antennas of the UE. The distance between the two antennas is not small enough. The above steps need to be performed for each antenna. Specifically, the present invention may also include the following embodiments:

Seventh Embodiment: Corresponding to the third embodiment, taking the first antenna (UE antenna 1) of the UE as an example, the information that needs to be fed back can be as shown in Table 11:

Table 11

Feedback information UE antenna 1

eNB antenna 1 H(l,l) = _r£ (1)^ (1,1)^ ^ (1)

eNB antenna 2

M _TE (1) eNB antenna m

After receiving the feedback information, the eNB can calculate the method as shown in Table 12:

Table 12

Calculation method UE antenna 1

eNB antenna 1 directly obtains H(l,l) eNB antenna 2

eNB antenna m

The remaining antennas of the UE also perform the above steps. In this embodiment, all the channel matrices can be recovered by the above calculation, and the same effect as DCFB is achieved, but compared with DCFB, this embodiment needs to feed back n channel matrices and (ml) ) x« values, compared with DCFB requiring feedback x« matrices, can reduce the bit overhead occupied by feedback, and greatly save air interface resources.

Eighth Embodiment: Corresponding to the fourth embodiment, taking the first antenna (UE antenna 1) of the UE as an example, the information that needs to be fed back can be as shown in Table 13:

Table 13

Feedback information UE antenna 1

eNB antenna 1 H(l,l) = _r£ (1)^(1,1)^ ^(1)

eNB antenna 2

M _TE (1))

eNB antenna 3

,1)= ^Μτε(3)

Μ _ΤΕ (2)

eNB antenna m = ^N(m ' ¹ = ^M »

H(m-\,\) _TE (wl) After receiving the feedback information, the eNB can calculate the method as shown in Table 14:

Table 14

Calculation method UE antenna 1

eNB antenna 1 directly obtained / (1,1)

eNB antenna 2 H(l,l) multiplied by A2,l)

eNB antenna 3 calculates H(2,l) and multiplies it by (3,1) The eNB antenna m calculates H(w _ 1,1) and multiplies it by β η, ί)

The rest of the antennas of the UE also perform the above steps. In this embodiment, all the channel matrices can be recovered by the above calculation, and the same effect as the DCFB is achieved. However, compared with the DCFB, this embodiment needs to feed back n channel matrices and 0- 1) χ« values, compared with DCFB requiring feedback x« matrices, can reduce the bit overhead occupied by feedback, and greatly save air interface resources.

Ninth Embodiment: Corresponding to the fifth embodiment, taking the first antenna (UE antenna 1) of the UE as an example, the information that needs to be fed back can be as shown in Table 15:

Table 15

eNB antenna 1

- · · • .. eNB antenna directly obtained, 1)

L2"

• .. - · · eNB antenna m m

- ,1)

The rest of the antennas of the UE also perform the above steps. In this embodiment, all the channel matrices can be recovered by the above calculation, and the same effect as the DCFB is achieved. However, compared with the DCFB, the present embodiment needs to feed back n channel matrices and 0-1) χ« values, with DCFB need feedback x « matrix phase

X

Compared, the bit overhead occupied by the feedback can be reduced, and the air interface resources are greatly saved.

Tenth Embodiment: Corresponding to the sixth embodiment, taking the first antenna (UE antenna 1) of the UE as an example, the information that needs to be fed back can be as shown in Table 17:

Table 17

- · · - · · eNB antenna m „ ,

M _TE (m - 1)

After receiving the feedback information, the eNB receives the feedback information.

Table 18

The rest of the antennas of the UE also perform the above steps. In this embodiment, all the channel matrices can be recovered by the above calculation, and the same effect as the DCFB is achieved. However, compared with the DCFB, this embodiment needs to feed back n channel matrices and 0- 1) χ «Values, compared with DCFB requiring feedback x « matrix, can reduce the bit overhead occupied by feedback, and greatly save air interface resources.

FIG. 7 is a schematic structural diagram of a first apparatus according to an embodiment of the present invention, including a selection module 71, an obtaining module 72, and a feedback module 73. The selecting module 71 is configured to select a channel matrix of the first link as a reference matrix, and the obtaining module 72 is configured to obtain a ratio of a mismatch parameter that represents a relationship between a channel matrix of the second link and a reference matrix, where the second link is Including: dividing the second antenna from the first antenna and the terminal side At least one antenna other than the at least one antenna and the corresponding spatial propagation channel, and at least one chain consisting of the second antenna and the base station side except at least one antenna other than the first antenna and a corresponding spatial propagation channel The feedback module 73 is configured to feed back the ratio of the reference matrix and the mismatch parameter to the base station.

The first link is composed of a first antenna on the base station side and a second antenna on the terminal side, and the acquiring module includes a first unit or a second unit. a ratio of a mismatch parameter of at least one antenna other than the first antenna to a first antenna and a ratio of mismatch parameters of at least one antenna and a second antenna other than the second antenna on the terminal side; the second The unit is configured to calculate, according to the first antenna on the base station side, a ratio of mismatch parameters between adjacent antennas on the base station side, and calculate a loss between adjacent antennas on the terminal side based on the second antenna on the terminal side. The ratio of the parameters.

The feedback module may include a third unit and a fourth unit; the third unit is configured to feed back the reference matrix to the base station by using the first link; and the fourth unit is configured to pass the second chain The road feeds back the ratio of the mismatch parameters corresponding to the second link to the base station.

The apparatus may be disposed on the terminal device side, and the method for determining the reference matrix and the method for calculating the ratio may be referred to the method embodiment described above.

In this embodiment, by feeding back a reference matrix and a ratio of mismatch parameters that characterize the relationship between the channel matrix of the remaining links and the reference matrix, less resource feedback channel information can be occupied, and the overhead can be reduced.

FIG. 8 is a schematic structural diagram of a second device according to an embodiment of the present invention, including a receiving module 81 and a computing module 82. The receiving module 81 is configured to receive a ratio of a reference matrix and a mismatch parameter sent by the terminal device, where the reference matrix is a channel matrix of the selected first link, and a ratio of the mismatch parameter is used to represent a channel of the second link. a relationship between the matrix and the reference matrix, the first link is composed of a first antenna on the base station side and a second antenna on the terminal side and a spatial propagation channel between the two, the second link includes: At least one link composed of at least one antenna other than the second antenna and the corresponding spatial propagation channel on the terminal side, and the second antenna and the base station side except the first antenna At least one link consisting of one antenna and a corresponding spatial propagation channel; the calculation module 82 is configured to obtain a channel matrix of all links according to a ratio of the reference matrix and the mismatch parameter.

The device may be disposed on the base station side, and the method for calculating the channel matrix of each link according to the reference matrix and the ratio may be referred to the foregoing method embodiment.

FIG. 9 is a schematic structural diagram of a system according to an embodiment of the present invention, including a terminal device 91 and a base station 92. The terminal device 91 is configured to select a channel matrix of the first link as a reference matrix, and obtain a ratio of a mismatch parameter for characterizing a relationship between a channel matrix of each second link and a reference matrix, where the second link includes a link in the first link to an antenna other than the antenna in the first link in the other side of the air interface; and feeding back a ratio of the reference matrix and the mismatch parameter; the base station 92 is configured to receive a ratio of the reference matrix and the mismatch parameter, and acquiring a channel matrix corresponding to each link according to a ratio of the reference matrix and the mismatch parameter.

For the terminal device in this embodiment, refer to the device shown in FIG. 7. The base station can refer to the device shown in FIG.

In this embodiment, by feeding back a reference matrix and a ratio of mismatch parameters that characterize the relationship between the channel matrix of the remaining links and the reference matrix, less resource feedback channel information can be occupied, and overhead is reduced; and the remaining chains are represented according to the reference matrix. The ratio of the mismatch parameters of the relationship between the channel matrix of the road and the reference matrix can calculate the channel matrix of each link, which can achieve the same effect as DCFB but consumes less resources.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions. The foregoing program may be stored in a computer readable storage medium, and when executed, the program includes The foregoing steps of the method embodiment; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than The present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that the invention may still be modified or substituted, and the modifications or equivalents may not be modified. The following technical solutions are omitted from the spirit and scope of the technical solutions of the present invention. For example, the method described in the foregoing embodiments may be combined with the prior art to implement feedback of channel information, that is, a part of the links in the MIMO system may adopt the feedback channel information and the acquisition channel matrix according to the embodiment of the present invention. The other methods use the prior art to implement channel information feedback and channel matrix acquisition. In practical applications, for a link, the ratio of the mismatch parameter that needs to directly feed back its channel matrix or feedback to characterize the relationship between its channel matrix and the reference matrix can be artificially set. The above embodiment should not It is considered to be a limitation of the invention.

Claims

Rights request

A method for feeding back channel information, comprising:

The method according to claim 1, wherein the selecting the first link comprises: when the antenna on the base station side and the antenna on the terminal side are line array antennas, selecting an antenna array element in the middle position of the base station side as the first Antenna, the antenna element in the middle position of the terminal side is selected as the second antenna.

The method according to claim 1, wherein the ratio of obtaining the mismatch parameter for characterizing the relationship between the channel matrix of the second link and the reference matrix comprises:

Calculating a ratio of a mismatch parameter of the at least one antenna other than the first antenna to the first antenna on the base station side and a mismatch parameter of the at least one antenna and the second antenna except the second antenna on the terminal side Ratio

Or,

Calculating a ratio of mismatch parameters between adjacent antennas on the base station side based on the first antenna on the base station side and calculating a mismatch parameter between adjacent antennas on the terminal side based on the second antenna on the terminal side ratio.

The method according to claim 1, wherein the ratio of the reference matrix and the mismatch parameter is fed back to the base station, including:

Feeding the reference matrix to the base station by using the first link;

And comparing, by the second link, a ratio of a mismatch parameter corresponding to the second link to a base station.

The method according to any one of claims 1 to 4, characterized in that, at least on the terminal side Method of channel information.

6. A method for obtaining a channel matrix, comprising:

7. The method of claim 6 wherein:

The first link is a chain (i0, j0), and the chain (i0, j0) represents a link composed of an antenna i0 on the base station side and an antenna j0 on the terminal side;

The second link includes a link chain (i, j0) and a link chain (i0, j), where chain(i, j0) represents a link formed between the antenna i on the base station side and the antenna j0 on the terminal side. Chain(i0,j) represents a link composed of the antenna i0 on the base station side and the antenna j on the terminal side;

The ratio of the mismatch parameters is β (i, Ό) and (0, );

Where = l,...,w, and ≠ 0 , j = \,..., _n ,Kj≠ jO , m is the number of antennas on the base station side, n is the number of antennas on the terminal side, i0 For any number in l~m, jO is any number in l~n;

The obtaining a channel matrix of all links according to a ratio of the reference matrix and a mismatch parameter includes:

The channel matrix of the link chain (i0, j0) is the reference matrix H(i0, j0);

When G, _O) = Ji^_, _{β ο} , j = ^M ^U), where M () is the day on the base station side

M _TE (iO) M _RU (jO) mismatch parameter of line i, M (0) is the mismatch parameter of antenna i0 on the base station side, Μ„(·) is the terminal side The mismatch parameter of the antenna j, M^GO) is the mismatch parameter of the antenna jO on the terminal side,

The channel matrix H(i,j0) of the link chain(i,j0) is calculated as:

The channel matrix H(i0,j) of the link chain(i0,j) is calculated as:

The channel matrix H(i,j) of the link chain(i,j) is calculated as:

H(i,j)^fi(i,jO)xfi(iO,j)xH(iO,jO).

8. The method of claim 6 wherein:

The second link includes a link _C hain(i, j0) and a link chain (i0, j), where chain(i, j0) represents a link composed of an antenna i on the base station side and an antenna j0 on the terminal side. , chain(i0,j) represents a link composed of the antenna i0 on the base station side and the antenna j on the terminal side;

The ratio of the mismatch parameters is β (i, Ό) and (0, );

Where = l,...,m, and ≠ 0 , j = \,..., _n , j≠ jO , m is the number of antennas on the base station side, n is the number of antennas on the terminal side, i0 For any number in l~m, jO is any number in l~n;

When ο) is the ratio of the mismatch parameter between adjacent antennas on the base station side and βαο, where Α is the ratio of the mismatch parameter between adjacent antennas on the terminal side,

The channel matrix H(i,j0) of the link chain(i,j0) is recursively derived from H(i0,j0) according to the following formula:

H(i,j0) = β(ϊ,Μ χ H(i',j0) , where H( ,jQ") is the base station side adjacent to the link chain(i,j0) and with the link chain( I0, j0) the channel matrix of the closer link;

The channel matrix H(i0,j) of the link chain(i0,j) is recursed from H(i0,j0) according to the following formula Get:

H(i0,j) = fi(iO,j) x H(iO,f) , where H(iO, f is the terminal side adjacent to the link chain(i0,j) and with the link chain( I0, j0) the channel matrix of the closer link;

The channel matrix H(i,j) of the link chain(i,j) is obtained by either of the following two methods, or is obtained by the following two methods separately and then averaged:

Method 1: Calculate the channel matrix of the link chain (i0, j0) to the link chain (i, j0) and calculate it adjacent to the link chain (i, j0) and far from the link chain (i0, j0) The link matrix to the link matrix of the link chain (i, j); Method 2: Calculate the channel matrix of the link _C hain(i0, j0) to the link chain (i0, j) and calculate the link chain (i0, j) The channel matrix of the link-to-link chain (i, j) that is adjacent and farther from the link chain (i0, j0).

9. A device for feeding back channel information, comprising:

a selection module, configured to select a channel matrix of the first link as a reference matrix, where the first link is composed of a first antenna on the base station side and a second antenna on the terminal side and a spatial propagation channel between the two links; And a ratio of a mismatch parameter for identifying a relationship between a channel matrix of the second link and a reference matrix, where the second link includes: at least a second antenna and a terminal side except the second antenna At least one link consisting of a first antenna and a corresponding spatial propagation channel, and at least one link consisting of a second antenna and at least one antenna other than the first antenna and a corresponding spatial propagation channel on the base station side;

The device according to claim 9, wherein the acquisition module comprises a first unit or a second unit;

The first unit is configured to calculate a ratio of a mismatch parameter of at least one antenna other than the first antenna and a first antenna on the base station side, and at least one antenna and a second side of the terminal side except the second antenna The ratio of the mismatch parameters of the two antennas;

The second unit is configured to calculate a ratio of mismatch parameters between adjacent antennas on the base station side based on the first antenna on the base station side, and calculate an adjacent antenna on the terminal side by using the second antenna on the terminal side as a reference. The ratio of the mismatch parameters between.

The device according to claim 9, wherein the feedback module comprises a third unit and a fourth unit;

The third unit is configured to feed back the reference matrix to the base station by using the first link, and the fourth unit is configured to use, by using the second link, the mismatch parameter corresponding to the second link The ratio is fed back to the base station.

12. An apparatus for acquiring a channel matrix, comprising:

And a calculation module, configured to acquire a channel matrix of all links according to a ratio of the reference matrix and the mismatch parameter.

13. Apparatus according to claim 12 wherein:

The ratio of the mismatch parameters is β α, ·ο) and ( 0, );

The calculation module includes a fifth unit or a sixth unit;

The fifth unit is configured to acquire a channel matrix of all links according to the following manner: The channel matrix of the link chain (i0, j0) is the reference matrix H(i0, j0);

When G, _O) = Ji^_, _{β ο} , j = ^M ^U), where _{M (0} is the day on the base station side)

M _TE (iO) M _RU (jO) The mismatch parameter of line i, M (0) is the mismatch parameter of antenna i0 on the base station side, Μ„(·) is the mismatch parameter of antenna j on the terminal side, M^ GO) is the mismatch parameter of the antenna jO on the terminal side,

The channel matrix H(i,j0) of the link chain(i,j0) is calculated as:

The channel matrix H(i0,j) of the link chain(i0,j) is calculated as:

The channel matrix H(i,j) of the link chain(i,j) is calculated as:

H(i, j) = β(ί, j0) x β(ΪΟ, j) x H(i0, jO);

The sixth unit is configured to acquire a channel matrix of all links according to the following manner:

When β (i, Ό) is the ratio of mismatch parameters between adjacent antennas on the base station side and ^ · 0, ·) is the ratio of mismatch parameters between adjacent antennas on the terminal side,

The channel matrix H(i0,j) of the link chain(i0,j) is recursed from H(i0,j0) according to the following formula:

H(i0,j) = fi(i0,j)xH(i0,f) , where H(i0,f is the terminal side adjacent to the link chain(i0,j) and with the link chain(i0) , j0) the channel matrix of the closer link;

Method 1: Calculate the channel matrix of the link chain (i0, j0) to the link chain (i, j0) and calculate the link Chain(i, j0) The channel matrix of the link-to-link chain (i, j) adjacent to the link chain (i0, j0); Method 2: Calculate the link _C hain(i0, j0) Recalculate the link matrix (i, j) adjacent to the link chain (i0, j) and the link chain (i0, j0) to the link matrix of the link chain (i0, j) Channel matrix.