kics paper(final).hwp
kics paper(final).hwp
kics paper(final).hwp
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Magnitude<br />
60<br />
50<br />
40<br />
30<br />
20<br />
10<br />
Spectrum of AM signal with 200KHz bandwidth<br />
0<br />
0 1 2 3<br />
Frequency (MHz) 4 5 6<br />
<br />
<br />
<br />
τ τ<br />
τ<br />
τ τ<br />
<br />
<br />
<br />
∞<br />
∞
lim<br />
→∞ <br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
α<br />
α<br />
α<br />
α<br />
α
Pd<br />
1<br />
0.9<br />
0.8<br />
0.7<br />
0.6<br />
0.5<br />
0.4<br />
0.3<br />
0.2<br />
Begin Spectrum Sensing<br />
α i , i+ +<br />
S C F in α i<br />
Peak detection<br />
i < M<br />
N<br />
Final Decision<br />
Pd vs. Eb/n0<br />
0.1<br />
Energy detection<br />
Peak detection<br />
0<br />
-35 -30 -25 -20 -15 -10<br />
Eb/N0<br />
-5 0 5 10 15<br />
Y<br />
Pd<br />
0.9<br />
0.8<br />
0.7<br />
0.6<br />
0.5<br />
0.4<br />
0.3<br />
0.2<br />
0.1<br />
0<br />
-0.1<br />
Original signal<br />
High Th<br />
Low Th<br />
False Alarm<br />
Pd vs. Eb/N0<br />
-34 -32 -30 -28<br />
Eb/N0<br />
-26 -24 -22
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