Physical Layer Security 135
−16
−14
−12
−10
−8
−6
−4
−2
0
2
4
Main channel SINR γ M [dB]
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
1
P
out
E S
4
P out of the WBPLSec vs Eve’s positions, E J =
N 0 = 3 dB, Eve close to Alice
N 0 = 3 dB, Eve close to Bob
N 0 = 3 dB, Eve in the middle
Figure 6.11 Outage probability versus γ M for different Eve’s positions.
−15
−10
−5
0
5
10
15
20
25
Distance [m]
P
out
0.9
0.8
0.7
0.6
0.5
0.4
Effect of γ M on the P out of C s
0.3
0.2
0.1
0
1
γ M > γ E , Security Area Wider
γ M < γ E , No Security Area
NEAR−FIELD REGION
AROUND BOB
NEAR−FIELD REGION
AROUND ALICE
Figure 6.12 Increment of the M γ and its effect on the secure region size.