US 9,083,417 B2Granted

Method and device for interference cancellation

AssigneeSt-Ericsson Semiconductor (Beijing) Co., Ltd

InventorsZhixun Tang, Liang Zhuang

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Abstract

An interference cancellation method performed by a receiver includes: determining a strong interference code channel among all code channels that carry a received signal, and determining a signal that corresponds to the strong interference code channel to be a strong interference signal, wherein the received signal has been matched filtered. The method further includes obtaining a reconstructed strong interference signal based on the determined strong interference signal and using a system matrix, performing the interference cancellation for the received signal using the reconstructed strong interference signal, to obtain the signal without interference. The strong interference signal can be reconstructed using the system matrix, and the interference cancellation can be performed for the received signal using the reconstructed strong interference signal. The complexity of inverting the matrix is reduced and the performance is enhanced by reducing the order of the matrix, and thus increasing the efficiency of cancelling the interference.

Claims9

Dependent claims

An interference cancellation method in a receiver, the method comprising:

determining a strong interference code channel among all code channels that carry a received signal, and determining a signal that corresponds to the strong interference code channel to be a strong interference signal by a receiver, wherein the received signal is a signal that has been matched filtered;
obtaining a reconstructed strong interference signal based on the determined strong interference signal using a system matrix;
and
performing the interference cancellation for the received signal by utilizing the reconstructed strong interference signal, to obtain the received signal without interference,
wherein the reconstructed strong interference signal is determined by the following equation:
{circumflex over (d)}SI= diag(AHA)emf,SI
wherein emf,SI is the strong interference signal, A is the system matrix, diag(.) is a matrix generated by setting diagonal elements into 0,
wherein,
e
mf
,
SI
=
{
0
…
0
︸
K
vru
0
…
0
︸
K
vru
︷
44
*
(
Kvru
-
n
)
…
e
mf
,
1
(
SI
⁢
⁢
1
)
…
e
mf
,
44
(
SI
⁢
⁢
1
)
…
e
mf
,
1
(
SIn
)
…
e
mf
,
44
(
SIn
)
}
,
Kvru being the total number of the code channels, emf,i(SI1) being the j-th element in the code channel of the i-th strong interference signal, and n beinq the number of the strong interference code channels.

72 more elements

An interference cancellation apparatus, comprising:

an interference detection module, being configured for determining a strong interference code channel among all code channels that carry a received signal, and determining a signal that corresponds to the strong interference code channel to be a strong interference signal, wherein the received signal is a signal that has been matched filtered;
a reconstruction module, being configured for obtaining a reconstructed strong interference signal based on the determined strong interference signal using a system matrix;
and
an interference cancellation module, being configured for performing the interference cancellation for the received signal by utilizing the reconstructed strong interference signal, to obtain the received signal without interference,
wherein the reconstructed strong interference signal is determined by the following equation:
{circumflex over (d)}SI= diag(AHA)emf,SI
wherein emf,SI is the strong interference signal, A is the system matrix, diag(.) is a matrix generated by setting diagonal elements into 0,
wherein,
e
mf
,
SI
=
{
0
⁢
⁢
…
⁢
⁢
0
︸
K
vru
⁢
⁢
0
⁢
⁢
…
⁢
⁢
0
︸
K
vru
︷
44
*
(
Kvru
-
n
)
⁢
⁢
…
⁢
⁢
e
mf
,
1
(
Sl
⁢
⁢
1
)
⁢
⁢
…
⁢
⁢
e
mf
,
44
(
S
⁢
⁢
l
⁢
⁢
1
)
⁢
⁢
…
⁢
⁢
e
mf
,
1
(
S
⁢
⁢
l
⁢
⁢
n
)
⁢
⁢
…
⁢
⁢
e
mf
,
44
(
S
⁢
⁢
l
⁢
⁢
n
)
}
⁢
,
Kvru being the total number of the code channels, emf,i(SI1) being the j-th element in the code channel of the i-th strong interference signal, and n being the number of the strong interference code channels.

114 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/991,708Filed 2 Dec 2011
Priority: CN 2010 1 05822686 Dec 2010
Published: US 2013/0287087 A131 Oct 2013
Granted: 14 Jul 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04B 1/10
Receivers: means associated with receiver for limiting or suppressing noise or interference
H04B 1/71052
Joint detection techniques, e.g. linear detectors: using decorrelation matrix
H04B 1/7107
The interference being multiple access interference: subtractive interference cancellation
H04B 2201/709736
Direct sequence modulation interference: hybrid interference mitigation schemes