US 9,287,948 B2 · Method and apparatus for receiving downlink wireless signal

Abstract

A method is provided for transmitting a downlink signal by a base station with an antenna array including a plurality of antenna elements in a wireless communication system. The downlink signal is precoded using a precoding matrix for the antenna array. The precoded downlink signal is transmitted to a user equipment (UE). Each element of the precoding matrix is expressed by ∑ n = 1 N ⁢ A n ⁢ ⅇ j ⁢ { ( n - 1 ) ⁢ kd ⁢ ⁢ cos ⁢ ⁢ θ + ϕ n } , where ⁢ ⁢ A n = ( N - 1 ) ! ( N - n ) ! ⁢ ( n - 1 ) ! , N denotes a number of antenna elements, n denotes an index of each of the antenna elements corresponding to 1 to N−1, k denotes a propagation constant, d denotes a distance between the antenna elements, θ denotes an azimuth, ϕ n ⁡ ( y n ) = ϕ set ⁡ ( 2 ⁢ y n ( N - 1 ) ⁢ d ) 2 , yn=(n−(N+1)/2)d, φset denotes a phase value to be applied to an antenna array 1, “!” denotes a symbol of factorial operations, and N! denotes a factorial of a non-negative integer N which is equal to a product of all positive integers less than or equal to N.

Claims6

Dependent claims

A method for transmitting a downlink signal by a base station with an antenna array including a plurality of antenna elements in a wireless communication system, the method comprising:

precoding, by the base station, the downlink signal using a precoding matrix for the antenna array;
and
transmitting, by the base station, the precoded downlink signal to a user equipment (UE),
wherein each element of the precoding matrix is expressed by:
∑
n
=
1
N
⁢
⁢
A
n
⁢
ⅇ
j
⁢
{
(
n
-
1
)
⁢
kd
⁢
⁢
cos
⁢
⁢
θ
+
ϕ
n
}
,
and
wherein
A
n
=
(
N
-
1
)
!
(
N
-
n
)
!
⁢
(
n
-
1
)
!
,
N denotes a number of antenna elements of the antenna array, n denotes an index of each of the antenna elements corresponding to 1 to N−1, k denotes a propagation constant, d denotes a distance between the antenna elements of the antenna array, θ denotes an azimuth,
ϕ
n
⁡
(
y
n
)
=
ϕ
set
⁡
(
2
⁢
y
n
(
N
-
1
)
⁢
d
)
2
,
yn=(n−(N+1)/2)d, φset denotes a phase value to be applied to an antenna array 1, “!” denotes a symbol of factorial operations, and N! denotes a factorial of a non-negative integer N equal to a product of all positive integers less than or equal to N.

86 more elements

Dependencies are inferred from the claim text.

Method and apparatus for receiving downlink wireless signal

Life of this patent

Method and apparatus for receiving downlink wireless signal

Life of this patent

Abstract

Claims6