Interference elimination method and apparatus for multi-antenna system
View Patent ↗Embodiments of the present invention disclose an interference elimination method and apparatus for a multi-antenna system. The method includes: generating an equalization coefficient according to a baseband signal received on a receiving antenna, a channel estimation matrix, and an obtained cross-correlation matrix of transmitted signals of a downlink channel on multiple transmit antennas; and performing interference elimination processing on the baseband signal according to the equalization coefficient.
1. An interference elimination method for a multi-antenna system, comprising:
generating an equalization coefficient according to a baseband signal received on a receiving antenna, a channel estimation matrix, and an obtained cross-correlation matrix of transmitted signals of a downlink channel on multiple transmit antennas; and
performing interference elimination processing on the baseband signal according to the equalization coefficient.
2. The method according to claim 1 , wherein the generating the equalization coefficient according to the baseband signal received on the receiving antenna, the channel estimation matrix, and the obtained cross-correlation matrix of the transmitted signals of the downlink channel on the multiple transmit antennas comprises:
generating a cross-correlation matrix of transmitted signals of a high speed-physical downlink shared channel HS-PDSCH channel on the multiple transmit antennas according to transmit power and an antenna weight vector on the HS-PDSCH channel;
generating a cross-correlation matrix of transmitted signals of a non-HS-PDSCH channel on the multiple transmit antennas according to transmit power and an antenna weight vector on the non-HS-PDSCH channel; and
generating the equalization coefficient according to the baseband signal received on the receiving antenna, the channel estimation matrix, the cross-correlation matrix of the transmitted signals of the HS-PDSCH channel on the multiple transmit antennas, and the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas.
3. The method according to claim 2 , wherein the generating the equalization coefficient according to the baseband signal received on the receiving antenna, the channel estimation matrix, the cross-correlation matrix of the transmitted signals of the HS-PDSCH channel on the multiple transmit antennas, and the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas is:
generating the equalization coefficient by using the following formula:
f={HR ss H H +HR qq H H +R vv } −1 He d
wherein, H is the channel estimation matrix, R ss is the cross-correlation matrix of the transmitted signals of the HS-PDSCH channel on the multiple transmit antennas, R qq is the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas, R vv is a cross-correlation matrix of noise, and e d represents an element of a column d in the matrix.
4. The method according to claim 2 , wherein the generating the cross-correlation matrix of the transmitted signals of the high speed-physical downlink shared channel HS-PDSCH channel on the multiple transmit antennas according to the transmit power and the antenna weight vector on the HS-PDSCH channel comprises:
generating the cross-correlation matrix of the transmitted signals of the HS-PDSCH channel on the multiple transmit antennas by using the following formula:
R ss =(α s (1) w (1) w (1)H ) {circle around (x)}I
wherein, {circle around (x)} represents direct product, α s (1) is the transmit power of the current user on the HS-PDSCH channel,
w
(
1
)
=
[
w
1
(
1
)
…
w
n
(
1
)
]
is the antenna weight vector of the HS-PDSCH channel of the current user, I is a unit matrix, and n is the number of the transmit antennas.
5. The method according to claim 2 , wherein the generating the cross-correlation matrix of the transmitted signals of the high speed-physical downlink shared channel HS-PDSCH channel on the multiple transmit antennas according to the transmit power and the antenna weight vector on the HS-PDSCH channel comprises:
generating the cross-correlation matrix of the transmitted signals of the HS-PDSCH channel on the multiple transmit antennas by using the following formula:
R
ss
=
(
α
s
(
1
)
w
(
1
)
w
(
1
)
H
+
∑
p
=
2
U
α
s
(
p
)
w
(
p
)
w
(
p
)
H
)
⊗
I
wherein, {circle around (x)} represents direct product, α s (1) is the transmit power of the current user on the HS-PDSCH channel,
w
(
1
)
=
[
w
1
(
1
)
…
w
n
(
1
)
]
is the antenna weight vector of the HS-PDSCH channel of the current user, I is a unit matrix, n is the number of the transmit antennas, pε(2, 3, . . . , U), U−1 is the number of non-current users, α s (p) is the transmit power of the non-current user, and
w
(
p
)
=
[
w
1
(
p
)
…
w
n
(
p
)
]
is the antenna weight vector of the HS-PDSCH channel of the non-current user.
6. The method according to claim 3 , wherein the generating the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas according to the transmit power and the antenna weight vector on the non-HS-PDSCH channel, comprises:
generating the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas by using the following formula:
R
=
(
α
q
1
(
1
)
…
0
0
…
0
0
…
α
qn
(
1
)
)
,
wherein, R qq is a diagonal matrix, α qi (1) (i=1, 2, . . . , n) is the power of the non-HS-PDSCH channel on the multiple transmit antennas, and
∑
q
=
1
n
α
qi
(
1
)
=
E
c
,
wherein E c is chip power; and the antenna weight vector is 0.
7. The method according to claim 3 , wherein the generating the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas according to the transmit power and the antenna weight vector on the non-HS-PDSCH channel, comprises:
generating a cross-correlation matrix of transmitted signals of a primary common pilot channel P-CPICH channel on the multiple transmit antennas by using the following formula:
R
=
[
1
2
α
qC
w
(
C
)
w
(
C
)
H
+
(
α
q
1
(
2
)
…
0
0
…
0
0
…
α
qn
(
2
)
)
]
⊗
I
,
wherein, α qC is the transmit power of the P-CPICH channel, w (C) =(1 . . . A n ) is the antenna weight vector of the P-CPICH channel, A i (i 2, . . . , n) is a pilot symbol of the P-CPICH channel modulated in an i th transmit antenna,
(
α
q
1
(
2
)
…
0
0
…
0
0
…
α
qn
(
2
)
)
is a diagonal matrix, α qi (2) (i=1, 2, . . . , n) is power of a channel other than the HS-PDSCH channel and the P-CPICH channel on multiple transmit antennas, and
∑
p
=
1
U
α
s
(
p
)
+
α
qC
+
∑
q
=
1
n
α
qi
(
2
)
=
E
c
.
8. The method according to claim 3 , wherein the generating the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas according to the transmit power and the antenna weight vector on the non-HS-PDSCH channel comprises:
generating a cross-correlation matrix of transmitted signals of a dedicated physical channel DPCH channel on the multiple transmit antennas by using the following formula:
R
=
[
α
qD
w
(
D
)
w
(
D
)
H
+
(
α
q
1
(
3
)
…
0
0
…
0
0
…
α
qn
(
3
)
)
]
⊗
I
wherein, α qD is the transmit power of the DPCH channel,
w
(
D
)
=
[
w
1
(
D
)
…
w
n
(
D
)
]
is the antenna weight vector of the DPCH channel,
(
α
q
1
(
3
)
…
0
0
…
0
0
…
α
qn
(
3
)
)
is a diagonal matrix, α qi (3) (i=1, 2, . . . , n) is power of a channel other than the HS-PDSCH channel and the DPCH channel on multiple transmit antennas, and
∑
p
=
1
U
α
s
(
p
)
+
α
qD
+
∑
q
=
1
n
α
qi
(
3
)
=
E
c
.
9. The method according to claim 3 , wherein the generating the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas according to the transmit power and the antenna weight vector on the non-HS-PDSCH channel comprises:
generating a cross-correlation matrix of transmitted signals of non-HS-PDSCH channel on the multiple transmit antennas by using the following formula:
R
=
[
1
2
α
qC
w
(
C
)
w
(
C
)
H
+
α
qD
w
(
D
)
w
(
D
)
H
+
(
α
q
1
(
4
)
…
0
0
…
0
0
…
α
qn
(
4
)
)
]
⊗
I
,
wherein α qC is the transmit power of the P-CPICH channel, w (C) =(1 . . . A n ) is the antenna weight vector of the P-CPICH channel A i (i=2, . . . , n) is a pilot symbol of the P-CPICH channel on an i th transmit antenna, α qD is the transmit power of the DPCH channel,
w
(
D
)
=
[
w
1
(
D
)
…
w
n
(
D
)
]
is the antenna weight vector of the DPCH channel,
(
α
q
1
(
4
)
…
0
0
…
0
0
…
α
qn
(
4
)
)
is a diagonal matrix, α qi (4) (i=1, 2, . . . , n) is power of a channel other than the HS-PDSCH channel, the P-CPICH channel and the DPCH channel on multiple transmit antennas, and
∑
p
=
1
U
α
s
(
p
)
+
α
qC
+
α
qD
+
∑
q
=
1
n
α
qi
(
4
)
=
E
c
.
10. A device for eliminating interference in a multi-antenna system, comprising a non-transitory computer readable storage medium and a processor, the non-transitory computer readable storage medium comprises a plurality of modules and units as codes executable by the processor, wherein the plurality of modules and units comprises:
a coefficient generation module, that generates an equalization coefficient according to a baseband signal received on a receiving antenna, a channel estimation matrix, and an obtained cross-correlation matrix of transmitted signals of a downlink channel on multiple transmit antennas; and
an interference elimination module, that performs interference elimination processing on the baseband signal according to the equalization coefficient.
11. The device according to claim 10 , wherein the coefficient generation module comprises:
a first matrix generation unit, that generates a cross-correlation matrix of transmitted signals of an HS-PDSCH channel on the multiple transmit antennas according to transmit power and an antenna weight vector on the HS-PDSCH channel;
a second matrix generation unit, that generates a cross-correlation matrix of transmitted signals of a non-HS-PDSCH channel on the multiple transmit antennas according to transmit power and an antenna weight vector on the non-HS-PDSCH channel; and
a coefficient generation unit, that generates the equalization coefficient according to the baseband signal received on the receiving antenna, the channel estimation matrix, the cross-correlation matrix of the transmitted signals of the HS-PDSCH channel on the multiple transmit antennas, and the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas.
12. The device according to claim 11 , wherein the coefficient generation unit generates the equalization coefficient by using the following formula:
f={HR ss H H +HR qq H H +R vv } −1 He d ,
wherein, H is the channel estimation matrix, R ss is the cross-correlation matrix of the transmitted signals of the HS-PDSCH channel on the multiple transmit antennas, R qq is the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas, R vv is a cross-correlation matrix of noise, and e d represents an element of a column d in the matrix.
13. The device according to claim 12 , wherein the first matrix generation unit generates the cross-correlation matrix of the transmitted signals of the HS-PDSCH channel on the multiple transmit antennas by using the following formula:
R ss =(α s (1) w (1) w (1)H ) {circle around (x)}I,
wherein, {circle around (x)} represents direct product, α s (1) is the transmit power of the current user on the HS-PDSCH channel,
w
(
1
)
=
[
w
1
(
1
)
…
w
n
(
1
)
]
is the antenna weight vector of the HS-PDSCH channel of the current user, I is a unit matrix, and n is the number of the transmit antennas.
14. The device according to claim 12 , wherein the first matrix generation unit generates the cross-correlation matrix of the transmitted signals of the HS-PDSCH channel on the multiple transmit antennas by using the following formula:
R
ss
=
(
α
s
(
1
)
w
(
1
)
w
(
1
)
H
+
∑
p
=
2
U
α
s
(
p
)
w
(
p
)
w
(
p
)
H
)
⊗
I
,
wherein, {circle around (x)} represents direct product, α s (1) is the transmit power of the current user on the HS-PDSCH channel,
w
(
1
)
=
[
w
1
(
1
)
…
w
n
(
1
)
]
is the antenna weight vector of the HS-PDSCH channel of the current user, I is a unit matrix, n is the number of the transmit antennas, pε(2, 3, . . . , U), U−1 is the number of non-current users, α s (p) is the transmit power of the non-current user, and
w
(
p
)
=
[
w
1
(
p
)
…
w
n
(
p
)
]
is the antenna weight vector of the HS-PDSCH channel of the non-current user.
15. The device according to claim 12 , wherein the second matrix generation unit generates the cross-correlation matrix of the transmitted signals of the non-HS-PDSCH channel on the multiple transmit antennas by using the following formula (3):
R
=
(
α
q
1
(
1
)
…
0
0
…
0
0
…
α
q
n
(
1
)
)
,
wherein, R qq is a diagonal matrix, α qi (1) (i=1, 2, . . . , n) is the power of the non-HS-PDSCH channel on the multiple transmit antennas, and
∑
q
=
1
n
α
qi
(
1
)
=
E
c
,
wherein E c is chip power; and the antenna weight vector is 0.
16. The apparatus device according to claim 12 , wherein the second matrix generation unit generates a cross-correlation matrix of transmitted signals of a primary common pilot channel P-CPICH channel on the multiple transmit antennas by using the following formula:
R
=
[
1
2
α
q
C
w
(
C
)
w
(
C
)
H
+
(
α
q
1
(
2
)
…
0
0
…
0
0
…
α
q
n
(
2
)
)
]
⊗
I
,
wherein, α qC is the transmit power of the P-CPICH channel, w (C) =(1 . . . A n ) is the antenna weight vector of the P-CPICH channel, A i (i=2, . . . , n) is a pilot symbol of the P-CPICH channel modulated in an transmit antenna,
(
α
q
1
(
2
)
…
0
0
…
0
0
…
α
q
n
(
2
)
)
is a diagonal matrix, α qi (2) (i=1, 2, . . . , n) is power of a channel other than the HS-PDSCH channel and the P-CPICH channel on multiple transmit antennas, and
∑
p
=
1
U
α
s
(
p
)
+
α
q
C
+
∑
q
=
1
n
α
qi
(
2
)
=
E
c
.
17. The device according to claim 12 , wherein the second matrix generation unit generates a cross-correlation matrix of transmitted signals of a dedicated physical channel DPCH channel on the multiple transmit antennas by using the following formula:
R
=
[
α
q
D
w
(
D
)
w
(
D
)
H
+
(
α
q
1
(
3
)
…
0
0
…
0
0
…
α
q
n
(
3
)
)
]
⊗
I
,
wherein, α qD is the transmit power of the DPCH channel,
w
(
D
)
=
[
w
1
(
D
)
…
w
n
(
D
)
]
is the antenna weight vector of the DPCH channel,
(
α
q
1
(
3
)
…
0
0
…
0
0
…
α
q
n
(
3
)
)
is a diagonal matrix, α qi (3) (i=1, 2, . . . , n) is power of a channel other than the HS-PDSCH channel and the DPCH channel on multiple transmit antennas, and
∑
p
=
1
U
α
s
(
p
)
+
α
q
D
+
∑
q
=
1
n
α
qi
(
3
)
=
E
c
.
18. The device according to claim 12 , wherein the second matrix generation unit generates a cross-correlation matrix of transmitted signals of non-HS-PDSCH channels on the multiple transmit antennas by using the following formula:
R
=
[
1
2
α
q
C
w
(
C
)
w
(
C
)
H
+
α
qD
w
(
D
)
w
(
D
)
H
+
(
α
q
1
(
4
)
…
0
0
…
0
0
…
α
q
n
(
4
)
)
]
⊗
I
,
wherein α qC is the transmit power of the P-CPICH channel, w (C) =(1 . . . A n ) is the antenna weight vector of the P-CPICH channel, A i (i=2, . . . , n) is a pilot symbol of the P-CPICH channel on an i th transmit antenna,
(
α
q
1
(
4
)
…
0
0
…
0
0
…
α
q
n
(
4
)
)
is a diagonal matrix,
w
(
D
)
=
[
w
1
(
D
)
…
w
n
(
D
)
]
is the antenna weight vector of the DPCH channel,
(
α
q
1
(
4
)
…
0
0
…
0
0
…
α
q
n
(
4
)
)
is a diagonal matrix, α qi (4) (i=1, 2, . . . , n) is power of a channel other than the HS-PDSCH channel, the P-CPICH channel and the DPCH channel on multiple transmit antennas, and
∑
p
=
1
U
α
s
(
p
)
+
α
q
C
+
α
q
D
+
∑
q
=
1
n
α
qi
(
4
)
=
E
c
.