Method and device for determining channel feedback information in LTE system
View Patent ↗A method and a device for determining channel feedback information in a Long Term Evolution (LTE) system are provided. The method includes: obtaining an (N−1) th layer interference-plus-noise matrix in an LTE system, and obtaining an N th layer interference-plus-noise matrix according to the (N−1) th layer interference-plus-noise matrix; and then, calculating a Signal to Interference plus Noise Ratio (SINR) corresponding to the N th layer interference-plus-noise matrix according to the N th layer interference-plus-noise matrix, and determining channel feedback information according to the SINR. It can be seen that, in the embodiments of the present invention, in a processing manner, a current layer interference-plus-noise matrix is calculated according to an obtained previous layer interference-plus-noise matrix through calculation in a calculation process of the channel feedback information, thus effectively reducing the calculation amount in the calculation process of the channel feedback information.
1. A method for determining channel feedback information in an LTE system, comprising:
obtaining an (N−1) th layer interference-plus-noise matrix in an LTE system, and obtaining an N th layer interference-plus-noise matrix according to the (N−1) th layer interference-plus-noise matrix; and
calculating an SINR corresponding to the N th layer interference-plus-noise matrix according to the N th layer interference-plus-noise matrix, and determining channel feedback information according to the SINR, wherein N is an integer that is greater than 1.
2. The method according to claim 1 , wherein a calculation formula for calculating the N th layer interference-plus-noise matrix according to the (N−1) th layer interference-plus-noise matrix comprises:
the N th layer interference-plus-noise matrix
J
v
=
[
J
v
-
1
+
t
5
-
t
4
-
t
4
H
t
3
]
,
wherein ν is the number of layers,
{
t
1
=
J
v
-
1
α
t
2
=
α
H
t
1
t
3
=
(
b
-
t
2
)
-
1
t
4
=
t
3
t
1
t
5
=
t
4
t
1
H
,
α
=
H
v
-
1
H
h
v
,
b
=
1
+
h
v
H
h
v
,
and
H
v
=
[
h
1
,
h
2
,
…
,
h
v
]
,
wherein H is a channel transmission matrix.
3. The method according to claim 1 , wherein the channel feedback information comprises a Precoding Matrix Indicator (PMI) and Rank Indication (RI), and the method further comprises:
reporting only the PMI when RI=1; or reporting the PMI and the RI at the same time; or reporting only the RI.
4. A device for determining channel feedback information in an LTE system, comprising:
an interference-plus-noise matrix obtaining unit, configured to obtain an (N−1) th layer interference-plus-noise matrix in an LTE system, and obtain an N th layer interference-plus-noise matrix according to the (N−1) th layer interference-plus-noise matrix; and
a channel feedback information determining unit, configured to calculate an SINR corresponding to the N th layer interference-plus-noise matrix according to the N th layer interference-plus-noise matrix obtained by an interference-plus-noise matrix obtaining unit through calculation, and determine channel feedback information according to the SINR, wherein N is an integer that is greater than 1.
5. The device according to claim 4 , wherein a calculation formula for calculating the N th layer interference-plus-noise matrix by the interference-plus-noise matrix obtaining unit according to the (N−1) th layer interference-plus-noise matrix comprises:
the N th layer interference-plus-noise matrix
J
v
=
[
J
v
-
1
+
t
5
-
t
4
-
t
4
H
t
3
]
,
wherein ν is the number of layers,
{
t
1
=
J
v
-
1
α
t
2
=
α
H
t
1
t
3
=
(
b
-
t
2
)
-
1
t
4
=
t
3
t
1
t
5
=
t
4
t
1
H
,
α
=
H
v
-
1
H
h
v
,
b
=
1
+
h
v
H
h
v
,
and
H
v
=
[
h
1
,
h
2
,
…
,
h
v
]
.
6. The device according to claim 4 , wherein the channel feedback information comprises a Precoding Matrix Indicator (PMI) and Rank Indication (RI), and the device further comprises a channel feedback information sending unit, configured to report only the PMI when RI=1; or report the PMI and the RI at the same time; or report only the RI.
7. A non-transitory computer-readable medium having computer executable instructions for causing a computer to perform steps comprising:
obtaining an (N−1) th layer interference-plus-noise matrix in an LTE system, and obtaining an N th layer interference-plus-noise matrix according to the (N−1) th layer interference-plus-noise matrix; and
calculating an SINR corresponding to the N th layer interference-plus-noise matrix according to the N th layer interference-plus-noise matrix, and determining channel feedback information according to the SINR, wherein N is an integer that is greater than 1.