class="bi x0 y0 w0 h1"
class="bi x0 y0 w0 h1"
(A, B, C, D)
u(t)
v
1
(t)
v
2
(t)
(A, B, C, D)
u(t)
v
1
(t)
v
2
(t)
x
1
(t)
x
2
(t)
u(t)
v
1
(t)
v
2
(t)

decoder
u(t)
e(t)
v(t) v’(t)
u’(t)
y
AM
S
u
y
ˆ
y
AM
S
u
y
AM
S
u
y
ˆ
class="bi x0 y0 w0 h1"