−1
−0.5
0
0.5
1
−1
−0.5
0
0.5
1
lg{t}
lg{E[x(t)]}
−1
−0.5
0
0.5
1
−1
−0.5
0
0.5
1
lg{t}
lg{Var[x(t)]}
η=
ε
1
=
ε
2
=
x(0)=
/
10
6
Start
Stop