Method and apparatus for measuring and feeding back channel information

Abstract

A method for measuring and feeding back channel information and a corresponding apparatus are provided. In an embodiment the method includes determining, by a first network device, a first codebook from a first codebook set, wherein the first codebook set comprises at least two first codebooks, wherein a sub-vector W.sub.x of each first codebook is formed by a zero vector and a non-zero vector, wherein vectors forming the W.sub.x are associated with different groups of antenna ports, wherein each first codebook comprises at least one first sub-vector $\left[\begin{array}{c}{V}_a^0\\ 0\\ V_a^1\\ 0\end{array}\right]$
and/or at least one second sub-vector $\left[\begin{array}{c}0\\ V_b^0\\ 0\\ V_b^1\end{array}\right],$
and wherein V.sub.a.sup.0 and V.sub.a.sup.1 are elements in the vector V.sub.a, and V.sub.b.sup.0 and V.sub.b.sup.1 are elements in the vector V.sub.b and sending a codebook index to a second network device, wherein the codebook index is associated with the first codebook selected from the first codebook set.

Claims

1. A method for measuring and feeding back channel information, the method comprising: determining, by a first network device, a first codebook from a first codebook set, wherein the first codebook set comprises at least two first codebooks, wherein a sub-vector W.sub.x of each first codebook is formed by a zero vector and a non-zero vector, wherein vectors forming the W.sub.x are associated with different groups of antenna ports, wherein each first codebook comprises at least one first sub-vector $\left[\begin{array}{c}{V}_a^0\\ 0\\ V_a^1\\ 0\end{array}\right]$ and/or at least one second sub-vector $\left[\begin{array}{c}0\\ V_b^0\\ 0\\ V_b^1\end{array}\right],$ and wherein V.sub.a.sup.0 and V.sub.a.sup.1 are elements in the vector V.sub.a, and V.sub.b.sup.0 and V.sub.b.sup.1 are elements in the vector V.sub.b; and sending a codebook index to a second network device, wherein the codebook index is associated with the first codebook selected from the first codebook set.

2. The method according to claim 1, wherein V.sub.a is one column of a Discrete Fourier Transform matrix and/or V.sub.b is one column of a Discrete Fourier Transform matrix.

3. A method for measuring and feeding back channel information, the method comprising: sending, by a second network device, a reference signal to a first network device; receiving, by the second network device, a codebook index sent by the first network device, wherein the codebook index indicating a first codebook of a first codebook set, wherein the first codebook set comprises at least two first codebooks, wherein a sub-vector W.sub.x of each first codebook is formed by a zero vector and a non-zero vector, wherein vectors forming the W.sub.x correspond to different groups of antenna ports, wherein each first codebook comprises at least one first sub-vector $\left[\begin{array}{c}{V}_a^0\\ 0\\ V_a^1\\ 0\end{array}\right]$ and/or at least one second sub-vector $\left[\begin{array}{c}0\\ V_b^0\\ 0\\ V_b^1\end{array}\right],$ and wherein V.sub.a.sup.0 and V.sub.a.sup.1 are elements in the vector V.sub.a, and V.sub.b.sup.0 and V.sub.b.sup.1 are elements in the vector V.sub.b; and determining, by the second network device, the first codebook according to the codebook index.

4. The method according to claim 3, wherein V.sub.a is one column of a Discrete Fourier Transform matrix and/or V.sub.b is one column of a Discrete Fourier Transform matrix.

5. A terminal apparatus comprising: a processor configured to determine a first codebook from a first codebook set, wherein the first codebook set comprises at least two first codebooks, a sub-vector W.sub.x of each first codebook is formed by a zero vector and a non-zero vector, wherein vectors forming the W.sub.x are associated with different groups of antenna ports, wherein each first codebook comprises at least one first sub-vector $\left[\begin{array}{c}{V}_a^0\\ 0\\ V_a^1\\ 0\end{array}\right]$ and/or at least one second sub-vector $\left[\begin{array}{c}0\\ V_b^0\\ 0\\ V_b^1\end{array}\right],$ wherein V.sub.a.sup.0 and V.sub.a.sup.1 are elements in the vector V.sub.a, and V.sub.b.sup.0 and V.sub.b.sup.1 are elements in the vector V.sub.b; and a transmitter configured to send a codebook index to a second network device, wherein the codebook index is associated with the first codebook selected from the first codebook set.

6. The apparatus according to claim 5, wherein V.sub.a is one column of a Discrete Fourier Transform matrix and/or V.sub.b is one column of a Discrete Fourier Transform matrix.

7. A communications apparatus comprising: a transmitter configured to send a reference signal to a first network device; a receiver configured to receive a codebook index sent by the first network device, wherein the codebook index indicates a first codebook in a first codebook set; and a processor configured to determine the first codebook according to the codebook index, wherein the first codebook set comprises at least two first codebooks, wherein a sub-vector W.sub.x of each first codebook is formed by a zero vector and a non-zero vector, wherein vectors forming the W.sub.x correspond to different groups of antenna ports, wherein each first codebook comprises at least one first sub-vector $\left[\begin{array}{c}{V}_a^0\\ 0\\ V_a^1\\ 0\end{array}\right]$ and/or at least one second sub-vector $\left[\begin{array}{c}0\\ V_b^0\\ 0\\ V_b^1\end{array}\right],$ and wherein V.sub.a.sup.0 and V.sub.a.sup.1 are elements in the vector V.sub.a, and V.sub.b.sup.0 and V.sub.b.sup.1 are elements in the vector V.sub.b.

8. The apparatus according to claim 7, wherein V.sub.a is one column of a Discrete Fourier Transform matrix and/or V.sub.b is one column of a Discrete Fourier Transform matrix.

Description

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