Digital Signal Processing Reference
In-Depth Information
1.2
1.2
1
1
0.8
0.8
0.6
0.6
0.4
0.4
0.2
0.2
0
0
0
0.1
0.2
0.3
0.4
0.5
0
0.1
0.2
0.3
0.4
0.5
Frequency (Hz)
Frequency (Hz)
(a)
(b)
1.2
1.2
1
1
0.8
0.8
0.6
0.6
0.4
0.4
0.2
0.2
0
0
0
0.1
0.2
0.3
0.4
0.5
0
0.1
0.2
0.3
0.4
0.5
Frequency (Hz)
Frequency (Hz)
(c)
(d)
1.2
1.2
1
1
0.8
0.8
0.6
0.6
0.4
0.4
0.2
0.2
0
0
0
0.1
0.2
0.3
0.4
0.5
0
0.1
0.2
0.3
0.4
0.5
Frequency (Hz)
Frequency (Hz)
(e)
(f)
=
,σ
n
=
.
FIGURE 5.6 : Modulus of the missing-data spectral estimates [ N
1, 51
(40%) missing samples] obtained via (a) complete-data WFFT, (b) complete-data APES,
(c) WFFT, (d) GAPES with M
128
0
10 − 2 , (e) MAPES-EM1 with M
=
64 and
=
=
64 and
10 − 3 , and (f ) MAPES-EM2 with M
10 − 3 .
=
=
64 and
=
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Spectral Analysis of Signals: The Missing Data Case
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