Method and device for sending and receiving precoded signals on a wireless communication system
The present invention relates to a method for transmitting a precoded signal, the method comprising: determining a precoding matrix on the basis of the first matrix, which is determined from a first codebook including precoding matrices indicated by a first precoding matrix index (PMI), and the second matrix, which is determined from a second codebook including precoding matrices indicated by a second PMI; and transmitting the precoded signal using the determined precoding matrix to the receiver, wherein each precoding matrix contained in the first codebook is comprised of a block diagonal matrix, and individual blocks of the block diagonal matrix are configured independently of each other, and each precoding matrix contained in the second codebook is comprised of an upper element and a lower element, where the lower element includes a phase rotation value.
1. A method for transmitting a precoded signal by a transmitter in a wireless communication system supporting Multiple Input Multiple Output (MIMO) transmission, the method comprising:
determining a first matrix (W 1 ) from a first codebook including precoding matrices indicated by a first precoding matrix index (PMI);
determining a second matrix (W 2 ) from a second codebook including precoding matrices indicated by a second PMI;
determining a precoding matrix (W) on the basis of the first matrix (W 1 ) and the second matrix (W 2 );
performing precoding of at least one layer mapped to a signal to be transmitted using the determined precoding matrix (W); and
transmitting the precoded signal to the receiver,
wherein each precoding matrix contained in the first codebook comprises a block diagonal matrix,
wherein individual blocks of the block diagonal matrix are configured independently of each other,
wherein each precoding matrix contained in the second codebook comprises an upper element and a lower element, where the lower element includes a phase rotation value, and
wherein:
an i-th precoding matrix W 1 ( i ) from among precoding matrices contained in the first codebook and a j-th precoding matrix W 2 ( j ) from among precoding matrices contained in the second codebook are represented by the following equation:
W
1
(
i
)
=
[
X
i
0
0
Y
i
]
W
2
(
j
)
=
[
e
M
k
e
M
l
…
e
M
n
α
j
e
M
k
β
j
e
M
l
…
γ
j
e
M
n
]
,
[
Equation
]
where W 1 ( i ) is a (Nt×2M)-sized block diagonal matrix, Xi and Yi are individual blocks of the block diagonal matrix, each of Xi and Yi is a (Nt/2)×M-sized matrix, and Nt is the number of transmission antennas of the transmitter,
where W 2 ( j ) is a (2M×r)-sized matrix, r is the number of the layers, e M p (p=k, l, . . . , n) is a (M×1)-sized vector, a p-th component from among M vector components of e M p is set to 1, the remaining components other than the p-th component are set to “0”, e M k , e M l , . . . , e M n denote the upper elements, α j e M k , β j e M l , . . . , γ j e M n denote the lower elements, and α j , β j , γ j denote the phase rotation values, and
where k, l, n are 1≦k, l, n≦M, and k, l, and n are integers, respectively.
2. A method for receiving a precoded signal by a receiver in a wireless communication system supporting Multiple Input Multiple Output (MIMO) transmission, the method comprising:
receiving a precoded signal obtained by precoding of at least one layer mapped to a signal transmitted from the transmitter, from the transmitter; and
processing the precoded signal using a precoding matrix (W) determined on the basis of:
a first matrix (W 1 ) from a first codebook including precoding matrices indicated by a first precoding matrix index (PMI); and
second matrix (W 2 ) from a second codebook including precoding matrices indicated by a second PMI,
wherein each precoding matrix contained in the first codebook comprises a block diagonal matrix,
wherein individual blocks of the block diagonal matrix are configured independently of each other,
wherein each precoding matrix contained in the second codebook comprises an upper element and a lower element, where the lower element includes a phase rotation value, and
wherein:
an i-th precoding matrix W 1 ( i ) from among precoding matrices contained in the first codebook and a j-th precoding matrix W 2 ( j ) from among precoding matrices contained in the second codebook are represented by the following equation:
W
1
(
i
)
=
[
X
i
0
0
Y
i
]
W
2
(
j
)
=
[
e
M
k
e
M
l
…
e
M
n
α
j
e
M
k
β
j
e
M
l
…
γ
j
e
M
n
]
[
Equation
]
where W 1 ( i ) is a (Nt×2M)-sized block diagonal matrix, Xi and Yi are individual blocks of the block diagonal matrix, each of Xi and Yi is a (Nt/2)×M-sized matrix, and Nt is the number of transmission antennas of the transmitter,
where W 2 ( j ) is a (2M×r)-sized matrix, r is the number of the layers, e M p (p=k, l, . . . , n) is a (M×1)-sized vector, a p-th component from among M vector components of e M p is set to 1, the remaining components other than the p-th component are set to “0”, e M k , e M l , . . . , e M n denote the upper elements, α j e M k , β j e M l , . . . , γ j e M n denote the lower elements, and α j , β j , γ j denote the phase rotation values, and
where k, l, n are 1≦k, l, n≦M, and k, l, and n are integers, respectively.
3. A transmitter for transmitting a precoded signal in a wireless communication system supporting Multiple Input Multiple Output (MIMO) transmission, the transmitter comprising:
a transmission (Tx) module configured to transmit a signal to a receiver; and
a processor for controlling the transmitter including the transmission (Tx) module, the processor configured to:
determine a first matrix (W 1 ) from a first codebook including precoding matrices indicated by a first precoding matrix index (PMI);
determine a second matrix (W 2 ) from a second codebook including precoding matrices indicated by a second PMI;
determine a precoding matrix (W) on the basis of the first matrix (W 1 ) and the second matrix (W 2 );
perform precoding of at least one layer mapped to a signal to be transmitted using the determined precoding matrix (W); and
transmit the precoded signal to the receiver through the transmission (Tx) module,
wherein each precoding matrix contained in the first codebook comprises a block diagonal matrix,
wherein individual blocks of the block diagonal matrix are configured independently of each other,
wherein each precoding matrix contained in the second codebook comprises an upper element and a lower element, where the lower element includes a phase rotation value, and
wherein:
an i-th precoding matrix W 1 ( i ) from among precoding matrices contained in the first codebook and a j-th precoding matrix W 2 ( j ) from among precoding matrices contained in the second codebook are represented by the following equation:
W
1
(
i
)
=
[
X
i
0
0
Y
i
]
W
2
(
j
)
=
[
e
M
k
e
M
l
…
e
M
n
α
j
e
M
k
β
j
e
M
l
…
γ
j
e
M
n
]
,
[
Equation
]
where W 1 ( i ) is a (Nt×2M)-sized block diagonal matrix, Xi and Yi are individual blocks of the block diagonal matrix, each of Xi and Yi is a (Nt/2)×M-sized matrix, and Nt is the number of transmission antennas of the transmitter, and
where W 2 ( j ) is a (2M×r)-sized matrix, r is the number of the layers, e M p (p=k, l, . . . , n) is a (M×1)-sized vector, a p-th component from among M vector components of e M p is set to 1, the remaining components other than the p-th component are set to “0”, e M k , e M l , . . . , e M n denote the upper elements, α j e M k , β j e M l , . . . , γ j e M n denote the lower elements, and α j , β j , γ j denote the phase rotation values, where k, l, n are 1≦k, l, n≦M, and k, l, and n are integers, respectively.
4. A receiver for receiving a precoded signal in a wireless communication system supporting Multiple Input Multiple Output (MIMO) transmission, the receiver comprising:
a reception (Rx) module configured to receive a signal from a transmitter; and
a processor configured to:
control the receiver including the reception (Rx) module;
receive a precoded signal obtained by precoding of at least one layer mapped to a signal transmitted from the transmitter, from the transmitter through the reception (Rx) module; and
process the precoded signal using a precoding matrix (W) determined on the basis of:
a first matrix (W 1 ) from a first codebook including precoding matrices indicated by a first precoding matrix index (PMI); and
a second matrix (W 2 ) from a second codebook including precoding matrices indicated by a second PMI,
wherein each precoding matrix contained in the first codebook comprises a block diagonal matrix,
wherein individual blocks of the block diagonal matrix are configured independently of each other,
wherein each precoding matrix contained in the second codebook comprises an upper element and a lower element, where the lower element includes a phase rotation value, and
wherein:
an i-th precoding matrix W 1 ( i ) from among precoding matrices contained in the first codebook and a j-th precoding matrix W 2 ( j ) from among precoding matrices contained in the second codebook are represented by the following equation:
W
1
(
i
)
=
[
X
i
0
0
Y
i
]
W
2
(
j
)
=
[
e
M
k
e
M
l
…
e
M
n
α
j
e
M
k
β
j
e
M
l
…
γ
j
e
M
n
]
,
[
Equation
]
where W 1 ( i ) is a (Nt×2M)-sized block diagonal matrix, Xi and Yi are individual blocks of the block diagonal matrix, each of Xi and Yi is a (Nt/2)×M-sized matrix, and Nt is the number of transmission antennas of the transmitter,
where W 2 ( j ) is a (2M×r)-sized matrix, r is the number of the layers, e M p (p=k, l, . . . , n) is a (M×1)-sized vector, a p-th component from among M vector components of e M p is set to 1, the remaining components other than the p-th component are set to “0”, e M k , e M l , . . . , e M n denote the upper elements, α j e M k , β j e M l , . . . , γ j e M n denote the lower elements, and α j , β j , γ j denote the phase rotation values, and
where k, l, n are 1≦k, l, n≦M, and k, l, and n are integers, respectively.