Multi-antenna system and method for transmitting and receiving information in multi-antenna system
View Patent ↗Embodiments of the present invention provide a method for transmitting information in a multi-antenna system. The method may include: a transmitting end receives information transmitted by a receiving end, wherein the information includes information of index of a precoder; the transmitting end selects a precoder from a two-layered codebook based on the information of the index of the precoder; the transmitting end precodes to-be-transmitted data by using the precoder; the transmitting end transmits the precoded data to the receiving end. The technical scheme of the present invention obtains codebooks most matching with channel distribution characteristics of dual-polarized antennas and minimizes performance loss brought by codebook quantization to remarkably improve the performances of precoding systems.
1. A method for transmitting information in a multi-antenna system, comprising:
receiving, by a transmitting end, information which comprises information of an index of a precoder transmitted by a receiving end;
selecting, by the transmitting end, a precoder from a dual-level codebook based on the information of the index of the precoder, and precoding to-be-transmitted data by using the precoder; and
transmitting, by the transmitting end, the precoded data to the receiving end;
wherein at least one precoder c in the dual-level codebook satisfies:
c
=
[
[
1
φ
m
,
1
]
⊗
w
(
:
,
1
)
[
1
φ
m
,
2
]
⊗
w
(
:
,
2
)
⋯
[
1
φ
m
,
N
]
⊗
w
(
:
,
N
)
]
,
wherein w is a N T /2×N matrix,
[
1
1
⋯
1
φ
m
,
1
φ
m
,
2
⋯
φ
m
,
N
]
is a 2×N matrix, N T is the number of transmit antennas, N is Rank, φ m,n denotes a complex number, denotes a Kronecker tensor product of matrices, w(:,n) denotes the n'th column of matrix w, and n=1, . . . , N.
2. The method of claim 1 , wherein each column of matrix w is a Discrete Fourier Transform, DFT, vector.
3. The method of claim 1 , wherein in the dual-level codebook,
at least one precoder c in a codebook of Rank 1 satisfies:
c
=
[
w
φ
m
,
1
w
]
,
wherein φ m,1 denotes a complex number, and w is a N T /2×1 vector;
at least one precoder c in a codebook of a Rank which is larger than 1 satisfies:
c
=
[
w
(
:
,
1
)
w
(
:
,
2
)
⋯
w
(
:
,
N
)
φ
m
,
1
w
(
:
,
1
)
φ
m
,
2
w
(
:
,
2
)
⋯
φ
m
,
N
w
(
:
,
N
)
]
wherein, φ m,n denotes a complex number, w(:,n) denotes the n'th column of matrix w and w is a N T /2×N matrix.
4. The method of claim 1 , wherein the dual-level codebook comprises:
a base codebook and a transform codebook;
a base precoder w k in the base codebook is a N T /2×N matrix; the transform codebook defines a mapping scheme for converting a base precoder into a N T ×N precoder c; N T is the number of transmit antennas of the MIMO system, N is Rank;
the mapping scheme comprises:
c
=
[
[
1
φ
m
,
1
]
⊗
w
(
:
,
1
)
[
1
φ
m
,
2
]
⊗
w
(
:
,
2
)
⋯
[
1
φ
m
,
N
]
⊗
w
(
:
,
N
)
]
wherein w k is a N T /2×N matrix,
Φ
m
=
[
1
1
⋯
1
φ
m
,
1
φ
m
,
2
⋯
φ
m
,
N
]
is a 2×N matrix, N T is the number of transmit antennas in the multi-antenna system, k is the index of a precoder in the base codebook, m is the index of a transform precoder in the transform codebook, φ m,n denotes a complex number, denotes a Kronecker tensor product of matrices, w k (:,n) denotes the n'th column of matrix w k , and n=1, . . . , N.
5. A method for receiving information in a multi-antenna system, comprising:
receiving, by a receiving end, information transmitted by a transmitting end, measuring a channel based on the information;
selecting, by the receiving end, a precoder from a dual-level codebook according to information of the channel;
transmitting, by the receiving end, information of the index of the selected precoder to the transmitting end;
wherein at least one precoder c in the dual-level codebook satisfies:
c
=
[
[
1
φ
m
,
1
]
⊗
w
(
:
,
1
)
[
1
φ
m
,
2
]
⊗
w
(
:
,
2
)
⋯
[
1
φ
m
,
N
]
⊗
w
(
:
,
N
)
]
,
wherein w is a N T /2×N matrix,
Φ
m
=
[
1
1
⋯
1
φ
m
,
1
φ
m
,
2
⋯
φ
m
,
N
]
is a 2×N matrix, φ m,n denotes a complex number, denotes a Kronecker tensor product of matrices, w(:, n) denotes the n'th column of matrix w, and n=1, . . . , N.
6. The method of claim 5 , wherein each column of matrix w is a Discrete Fourier Transform, DFT, vector.
7. The method of claim 5 , wherein in the dual-level codebook,
at least one precoder c in a codebook of Rank 1 satisfies:
c
=
[
w
φ
m
,
1
w
]
,
wherein φ m,1 denotes a complex number, and w is a N T /2×1 vector;
at least one precoder c in a codebook of a Rank which is larger than 1 satisfies:
c
=
[
w
(
:
,
1
)
w
(
:
,
2
)
⋯
w
(
:
,
N
)
φ
m
,
1
w
(
:
,
1
)
φ
m
,
2
w
(
:
,
2
)
⋯
φ
m
,
N
w
(
:
,
N
)
]
,
wherein, φ m,n denotes a complex number, w(:,n) denotes the n'th column of a N T /2×N matrix w.
8. The method of claim 5 , wherein the dual-level codebook comprises:
a base codebook and a transform codebook;
a base precoder w k in the base codebook is a N T /2×N matrix; the transform codebook defines a mapping scheme for converting a base precoder into a N T ×N precoder c; N T is the number of transmit antennas of the MIMO system, N is Rank;
the mapping scheme comprises:
c
=
[
[
1
φ
m
,
1
]
⊗
w
k
(
:
,
1
)
[
1
φ
m
,
2
]
⊗
w
k
(
:
,
2
)
⋯
[
1
φ
m
,
N
]
⊗
w
k
(
:
,
N
)
]
wherein w k is a N T /2×N matrix,
Φ
m
=
[
1
1
⋯
1
φ
m
,
1
φ
m
,
2
⋯
φ
m
,
N
]
is a 2×N matrix, N T is the number of transmit antennas in the multi-antenna system, k is the index of a precoder in the base codebook, m is the index of a transform precoder in the transform codebook, φ m,n denotes a complex number, denotes a Kronecker tensor product of matrices, w k (:,n) denotes the n'th column of matrix w k , and n=1, . . . , N.
9. A multi-antenna system, comprising a transmitting end and a receiving end, wherein
the transmitting end comprises a receiving module, a precoding module and a transmitting module;
the receiving module is for receiving information transmitted by a receiving end, wherein the information comprises information of an index of a precoder;
the precoding module is for selecting a precoder from a dual-level codebook based on the information of the index of the precoder, and precoding to-be-transmitted data by using the precoder; and
the transmitting module is for transmitting the precoded data to the receiving end;
wherein at least one precoder c in the dual-level codebook satisfies:
c
=
[
[
1
φ
m
,
1
]
⊗
w
(
:
,
1
)
[
1
φ
m
,
2
]
⊗
w
(
:
,
2
)
⋯
[
1
φ
m
,
N
]
⊗
w
(
:
,
N
)
]
wherein w is a N T /2×N matrix,
Φ
m
=
[
1
1
⋯
1
φ
m
,
1
φ
m
,
2
⋯
φ
m
,
N
]
is a 2×N matrix, φ m,n denotes a complex number, denotes a Kronecker tensor product of matrices, w(:,n) denotes the w'th column of matrix n, and n=1, . . . , N.
10. The multi-antenna of claim 9 , wherein each column of matrix w is a Discrete Fourier Transform, DFT, vector.
11. The multi-antenna system of claim 9 , wherein the receiving end comprises a receiving module, a selecting module and a transmitting module;
the receiving module is for receiving information transmitted by a transmitting end, and measuring a channel by using the information;
the selecting module is for selecting a precoder from a dual-level codebook according to information of the channel;
the transmitting module is for transmitting information of the index of the selected precoder to the transmitting end.
12. The multi-antenna system of claim 9 , wherein the dual-level codebook comprises: a base codebook and a transform codebook;
a base precoder w k in the base codebook is a N T /2×N matrix; the transform codebook defines a mapping scheme for converting a base precoder into a N T ×N precoder c; N T is the number of transmit antennas of the MIMO system, N is Rank;
the mapping scheme comprises:
c
=
[
[
1
φ
m
,
1
]
⊗
w
k
(
:
,
1
)
[
1
φ
m
,
2
]
⊗
w
k
(
:
,
2
)
⋯
[
1
φ
m
,
N
]
⊗
w
k
(
:
,
N
)
]
wherein w k is a N T /2×N matrix,
Φ
m
=
[
1
1
⋯
1
φ
m
,
1
φ
m
,
2
⋯
φ
m
,
N
]
is a 2×N matrix, N T is the number of transmit antennas in the multi-antenna system, k is the index of a precoder in the base codebook, m is the index of a transform precoder in the transform codebook, φ m,n denotes a complex number, denotes a Kronecker tensor product of matrices, w k (:,n) denotes the n'th column of matrix w k , and n=1, . . . , N.
13. The multi-antenna system of claim 9 , wherein each column of matrix w k is a Discrete Fourier Transform, DFT, vector.