US 8,576,963 B2Granted

Non-coherent detection apparatus and method for IEEE 802.15.4 LR-WPAN BPSK receiver

AssigneeChung-Ang University Industry-Academy Cooperation Foundation

InventorsTae-Gyu Chang, Hyeon-Jin Jeon, Tanee Demeechai

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Abstract

A non-coherent detection apparatus includes, inter alia, a correlation unit, a frequency offset estimator, and a signal detector. The correlation unit obtains a differential phase signal by multiplying a complex conjugate value of a delay signal obtained by delaying a received signal by (N+1) chips by the received signal, sums-up resultant values obtained by multiplying each component of the differential phase signal by each component of a correlation sequence and outputs a correlation signal. The frequency offset estimator estimates a frequency offset based on a value obtained by accumulatively summing-up the correlation signals corresponding to preamble portions of the received signal. The signal detector detects an original signal from the received signal based on a size of a real-number part of a resultant value obtained by multiplying the frequency offset estimated by the frequency offset estimator by the correlation signal corresponding to a PHY payload portion of the received signal.

Claims11

Dependent claims

A non-coherent detection apparatus comprising:

a correlation unit obtaining a differential phase signal by multiplying a complex conjugate value of a delay signal that is obtained by delaying a received signal by (N+1) chips (N corresponds to a length of a pseudorandom number (PN) code) by the received signal, summing-up resultant values that are obtained by multiplying each component of the differential phase signal by each component of a correlation sequence corresponding to the received signal and outputting a correlation signal;
a frequency offset estimator estimating a frequency offset based on a value that is obtained by accumulatively summing-up the correlation signals corresponding to preamble portions of the received signal from among the correlation signals;
and
a signal detector detecting an original signal from the received signal based on a size of a real-number part of a resultant value that is obtained by multiplying the frequency offset estimated by the frequency offset estimator by the correlation signal corresponding to a PHY payload portion of the received signal from among the correlation signals,
wherein the frequency offset estimator estimates the frequency offset from a whole preamble of the received signal by using the following Equation C:
Y
1
=
⁢
1
(
J
-
1
)
⁢
N
-
1
⁢
{
∑
m
=
2
J
-
1
⁢
∑
k
=
0
N
-
1
⁢
p
⁡
[
Nm
+
k
]
⁢
p
*
[
Nm
-
(
N
+
1
)
+
⁢
k
]
⁢
b
m
⁡
[
k
]
+
∑
k
=
1
N
-
1
⁢
p
⁡
[
N
+
k
]
⁢
p
*
⁡
[
k
-
1
]
⁢
b
1
⁡
[
k
]
}
=
⁢
ⅇ
j
⁡
(
N
+
1
)
⁢
ω
0
⁢
T
c
+
η
5
,
(
C
)
where, Y1 is the frequency offset, p[n] is a preamble signal received at time 0, J is a bit number of the preamble signal p[n], N is a length of the PN code, bm[k] is a k-th component of the correlation sequence with respect to the m-th bit of the PPDU, ω0 is a carrier wave frequency offset, Tc is a duration of a chip, and η5 is a noise component.

120 more elements

A non-coherent detection method comprising:

obtaining a differential phase signal by multiplying a complex conjugate value of a delay signal that is obtained by delaying a received signal by (N+1) chips (N corresponds to a length of a pseudorandom number (PN) code) by the received signal, summing-up resultant values that are obtained by multiplying each component of the differential phase signal by a component of a correlation sequence corresponding to the received signal and outputting a correlation signal;
estimating a frequency offset based on a value that is obtained by accumulatively summing-up the correlation signals corresponding to preamble portions of the received signal from among the correlation signals;
and
detecting an original signal from the received signal based on a size of a real-number part of a resultant value that is obtained by multiplying the frequency offset estimated by the frequency offset estimator by the correlation signal corresponding to a PHY payload portion of the received signal from among the correlation signals,
wherein, in the estimating of the frequency offset, the frequency offset is estimated from a whole preamble of the received signal by using the following Equation C:
Y
1
=
⁢
1
(
J
-
1
)
⁢
N
-
1
⁢
{
∑
m
=
2
J
-
1
⁢
∑
k
=
0
N
-
1
⁢
p
⁡
[
Nm
+
k
]
⁢
p
*
[
Nm
-
(
N
+
1
)
+
⁢
k
]
⁢
b
m
⁡
[
k
]
+
∑
k
=
1
N
-
1
⁢
p
⁡
[
N
+
k
]
⁢
p
*
⁡
[
k
-
1
]
⁢
b
1
⁡
[
k
]
}
=
⁢
ⅇ
j
⁡
(
N
+
1
)
⁢
ω
0
⁢
T
c
+
η
5
,
(
C
)
where Y1 is the frequency offset, p[n] is a preamble signal received at time 0, J is a bit number of the preamble signal p[n], N is a length of the PN code, bm[k] is a k-th component of the correlation sequence with respect to the m-th bit of the PPDU, ω0 is a carrier wave frequency offset, Tc is a duration of a chip, and η5 is a noise component.

120 more elements

Dependencies are inferred from the claim text.