US 8,275,076 B2Granted

Receiver and method for detecting signal in multiple antenna system

AssigneesSamsung Electronics Co., Ltd., Industry-Academic Cooperation Foundation, Yonsei University

InventorsSung-Yoon Jung, Sung-Soo Hwang, Joo-Hyun Lee, Jong-Ho Lee, Sung-Hwan Kim, Jong-Soo Seo, Jong-Kyung Kim, Jin-Yong Choi

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Abstract

Provided are a receiver and a method for detecting a signal in a multiple antenna system. The receiver includes a filter coefficient calculator and a signal detector. After separating a first signal portion and a second signal portion, the filter coefficient calculator calculates an MMSE filter coefficient using a Matrix Inversion Lemma such that an inverse matrix of the first signal portion has a predetermined constant value regardless of a repetition signal detection process. The signal detector detects a relevant transmission signal from an interference-removed reception signal using the MMSE filter coefficient.

Claims20

Dependent claims

A receiver for detecting configured to detect a signal in a multiple antenna system, the receiver comprising:

a filter coefficient calculator configured to calculate a Minimum Mean Squared Error (MMSE) filter coefficient using Matrix Inversion Lemma such that an inverse matrix of a first signal portion has a constant value regardless of a repetition signal detection process considering a second signal portion;
and
a signal detector configured to detect a relevant transmission signal from an interference-removed reception signal using the MMSE filter coefficient,
wherein the filter coefficient calculator comprises:
an interference signal selector configured to select, as the second signal portion, an interference signal whose interference level is largest from signals received via other transmission antennas except a relevant transmission antenna, when the number of the transmission antennas is at least three;
and
an inverse matrix calculator configured to calculate the inverse matrix of the first signal portion,
wherein the MMSE filter coefficient is configured to be calculated using the following Equations:
G
m
(
i
)
=
(
σ
x
2
⁢
HH
H
+
σ
2
⁢
I
N
-
v
j
(
i
)
⁡
(
v
j
(
i
)
)
H
)
-
1
⁢
σ
x
2
⁢
h
m
,
j
≠
m
⁢
⁢
and
⁢
=
(
T
-
1
+
1
β
(
i
)
⁢
u
m
(
i
)
⁡
(
u
m
(
i
)
)
H
)
⁢
σ
x
2
⁢
h
m
where σx2 is power of a transmission signal, σ2 is power of a white noise, H is a channel matrix having a size of M×N, IN is an N×N-unit matrix, (•)H is a conjugate transpose matrix, M is the number of transmission antennas, N is the number of reception antennas, hm is an m-th column of H,
v
j
(
j
)
=

x
_
j
(
i
)

⁢
h
j
(j=1, 2, . . . , m−1, m+1, . . . , M) is an interference signal generated by a signal xj transmitted from an antenna j when a transmission signal xm is detected, T=σx2HHH+σ2IN, um(i)=T−1vj(i), β(i)=1−(vj(i))HT−1vj(i), and when the number of the transmission antennas is at least three, a signal vj(j) having a greatest interference is selected.

110 more elements

A reception method for detecting a signal in a multiple antenna system, the method comprising:

calculating, using a MIMO detector, a Minimum Mean Squared Error (MMSE) filter coefficient using Matrix Inversion Lemma such that an inverse matrix of a first signal portion has a constant value regardless of a repetition signal detection process considering a second signal portion;
and
detecting a relevant transmission signal using the MMSE filter coefficient,
wherein the calculating of the MMSE filter coefficient comprises:
selecting, as the second signal portion, an interference signal whose interference level is largest from signals received via other transmission antennas except a relevant transmission antenna, when the number of the transmission antennas is at least three, and
calculating the inverse matrix of the first signal portion, and
wherein the MMSE filter coefficient is calculated using the following Equations:
G
m
(
i
)
=
(
σ
x
2
⁢
HH
H
+
σ
2
⁢
I
N
-
v
j
(
i
)
⁡
(
v
j
(
i
)
)
H
)
-
1
⁢
σ
x
2
⁢
h
m
,
j
≠
m
⁢
⁢
and
⁢
=
(
T
-
1
+
1
β
(
i
)
⁢
u
m
(
i
)
⁡
(
u
m
(
i
)
)
H
)
⁢
σ
x
2
⁢
h
m
where σx2 is power of a transmission signal, σ2 is power of a white noise, H is a channel matrix having a size of M×N, IN is an N×N-unit matrix, (•)H is a conjugate transpose matrix, M is the number of transmission antennas, N is the number of reception antennas, hm is an m-th column of H,
v
j
(
j
)
=

x
_
j
(
i
)

⁢
h
j
(j=1, 2, . . . m−1, m+1, . . . , M) is an interference signal generated by a signal xj transmitted from an antenna j when a transmission signal xm is detected, T=σx2HHH+σ2IN, um(i)=T−1vj(i), β(i)=1−(vj(i))HT−1vj(i), when the number of the transmission antennas is at least three, a signal vj(j) having a greatest interference is selected.

109 more elements

Code embodied on a non-transitory computer-readable medium configured to, when executed on a computer, perform at least the following:

calculate a Minimum Mean Squared Error (MMSE) filter coefficient using Matrix Inversion Lemma such that an inverse matrix of a first signal portion has a constant value regardless of a repetition signal detection process considering a second signal portion;
and
detect a relevant transmission signal using the MMSE filter coefficient,
wherein the calculating of the MMSE filter coefficient comprises:
selecting, as the second signal portion, an interference signal whose interference level is largest from signals received via other transmission antennas except a relevant transmission antenna, when the number of the transmission antennas is at least three, and
calculating the inverse matrix of the first signal portion, and
wherein the MMSE filter coefficient is configured to be calculated using the following Equations:
G
m
(
i
)
=
(
σ
x
2
⁢
HH
H
+
σ
2
⁢
I
N
-
v
j
(
i
)
⁡
(
v
j
(
i
)
)
H
)
-
1
⁢
σ
x
2
⁢
h
m
,
j
≠
m
⁢
⁢
and
⁢
=
(
T
-
1
+
1
β
(
i
)
⁢
u
m
(
i
)
⁡
(
u
m
(
i
)
)
H
)
⁢
σ
x
2
⁢
h
m
where σx2 is power of a transmission signal, σ2 is power of a white noise, H is a channel matrix having a size of M×N, IN is an N×N-unit matrix, (•)H is a conjugate transpose matrix, M is the number of transmission antennas, N is the number of reception antennas, hm is an m-th column of H,
v
j
(
j
)
=

x
_
j
(
i
)

⁢
h
j
(j=1, 2, . . . , m−1, m+1, . . . , M) is an interference signal generated by a signal xj transmitted from an antenna j when a transmission signal xm is detected, T=σx2HHH+σ2IN, um(i)=T−1vj(i), β(i)=1−(vj(i))HT−1vj(i), and when the number of the transmission antennas is at least three, a signal vj(j) having a greatest interference is selected.

109 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/386,299Filed 16 Apr 2009
Priority: KR 10-2008-003509916 Apr 2008
Published: US 2009/0262871 A122 Oct 2009
Granted: 25 Sep 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H04B 7/0854
Joint weighting: using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
H04L 25/03038
Adaptive, i.e. capable of adjustment during data reception: with a non-recursive structure
H04B
Transmission
H04L
Digital communication