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le
lig
h
t
co
m
m
u
n
icatio
n
s
y
s
tem
.
B
ased
o
n
th
e
r
esu
lts
o
f
th
e
s
tu
d
y
,
au
d
io
s
ig
n
als ca
n
b
e
s
en
t w
ith
a
m
ax
im
u
m
d
is
tan
ce
th
at
is
lim
ited
to
2
0
cm
.
Pre
v
io
u
s
ly
in
201
6
,
th
er
e
was a
s
tu
d
y
co
n
d
u
cted
b
y
D
ar
lis
,
et
a
l.
[
5
]
.
T
h
e
r
esear
ch
lig
h
t e
m
itti
n
g
d
io
d
e
(
LED
)
was b
y
tr
y
i
n
g
to
s
en
d
a
v
id
eo
s
ig
n
al
with
u
s
in
g
VL
C
.
T
h
e
r
esu
lts
s
h
o
w
th
at
th
e
v
id
eo
s
ig
n
al
ca
n
b
e
s
en
t f
r
o
m
th
e
tr
an
s
m
itter
to
th
e
r
ec
eiv
er
at
v
ar
io
u
s
d
is
tan
ce
s
u
s
in
g
b
id
ir
ec
tio
n
al
m
e
th
o
d
s
.
W
h
er
ea
s
in
2
0
1
4
,
r
ese
ar
ch
co
n
d
u
cted
b
y
Ku
m
ar
an
d
L
o
u
r
e
n
co
[
6
]
tr
ie
d
to
im
p
lem
en
t
VL
C
o
n
tr
af
f
i
c
s
ig
n
s
o
n
th
e
h
ig
h
way
.
T
h
e
r
esu
lts
o
f
th
is
s
tu
d
y
in
d
icate
th
at
VL
C
ca
n
b
e
ap
p
li
ed
o
n
th
e
r
o
ad
an
d
s
en
d
in
f
o
r
m
atio
n
with
a
m
a
x
im
u
m
d
is
tan
ce
o
f
1
.
5
m
.
I
n
2
0
1
5
,
a
s
tu
d
y
c
o
n
d
u
cted
b
y
Azk
a
et
a
l.
[7
]
tr
ied
t
o
tr
a
n
s
m
it
d
ig
ita
l
d
ata
in
th
e
f
o
r
m
o
f
f
iles
u
s
in
g
th
e
VL
C
s
y
s
tem
,
th
is
to
o
l
ca
n
co
m
m
u
n
icate
at
a
m
ax
im
u
m
d
is
tan
ce
o
f
3
0
cm
b
etwe
en
th
e
tr
an
s
m
itter
an
d
r
ec
eiv
er
at
an
an
g
le
o
f
0
°
an
d
a
r
an
g
e
o
f
1
0
cm
with
o
u
t
in
ter
f
er
en
ce
f
r
o
m
o
th
er
o
b
jects.
Oth
er
r
esear
ch
es
wer
e
d
o
n
e
b
y
Fu
ad
a
et
a
l.
[
8
]
,
Dee
p
a
et
a
l.
[
9
]
,
an
d
Qasin
et
a
l.
[
1
0
]
th
at
an
aly
ze
VL
C
tech
n
o
lo
g
y
th
at
w
ill
b
e
u
s
ed
f
o
r
th
o
s
e
s
y
s
tem
s
.
B
e
s
id
es
th
at,
th
is
tec
h
n
o
lo
g
y
h
as
b
ee
n
im
p
lem
en
te
d
an
d
a
p
p
lied
in
d
o
o
r
s
[
1
1
-
1
8
]
,
u
n
d
er
wate
r
[
1
9
-
2
3
]
,
v
eh
icu
lar
[
2
4
]
,
an
d
i
n
ter
n
et
n
e
two
r
k
[
2
5
]
.
B
ased
o
n
th
e
p
r
e
v
io
u
s
r
esear
ch
es,
it
ca
n
b
e
p
r
ed
i
cted
th
at
th
e
VL
C
tech
n
o
lo
g
y
allo
ws
th
em
to
b
e
im
p
lem
en
ted
o
n
a
f
o
ld
i
n
g
s
tick
th
at
is
u
s
ed
v
is
u
ally
im
p
air
ed
in
d
eter
m
in
in
g
o
r
ie
n
tatio
n
a
n
d
m
o
b
ilit
y
.
I
n
th
is
r
esear
ch
,
th
e
i
m
p
lem
en
tatio
n
o
f
lig
h
t
f
o
llo
wer
s
y
s
tem
s
f
o
r
v
is
u
ally
im
p
air
ed
u
s
in
g
v
is
ib
le
lig
h
t
i
s
p
r
o
p
o
s
ed
.
T
h
is
s
y
s
tem
ca
n
en
ab
le
v
is
u
a
lly
im
p
air
ed
p
e
o
p
le
to
d
eter
m
in
e
o
r
ien
tatio
n
an
d
s
u
p
p
o
r
t
m
o
b
ilit
y
,
esp
ec
ially
in
d
o
o
r
s
,
u
s
in
g
v
is
ib
le
lig
h
t.
T
h
e
v
is
u
ally
im
p
air
ed
p
ath
wa
y
a
s
a
lig
h
t
f
o
llo
wer
s
y
s
tem
p
ath
i
n
I
n
d
o
o
r
was
m
ad
e
as
a
VL
C
tr
an
s
m
itter
.
T
h
e
V
L
C
r
ec
eiv
er
th
at
was
eq
u
i
p
p
ed
with
an
alar
m
s
y
s
tem
is
m
ad
e
i
n
a
v
is
u
ally
im
p
air
ed
f
o
ld
in
g
s
tick
.
Utilizin
g
th
is
s
y
s
tem
,
v
is
u
ally
im
p
air
ed
ca
n
b
e
g
u
id
ed
u
s
in
g
th
e
au
d
i
o
s
y
s
tem
u
tili
zin
g
v
is
ib
le
lig
h
t.
T
h
e
m
ea
s
u
r
e
m
en
t
o
f
th
i
s
s
y
s
tem
u
s
es
ac
r
y
lic
a
n
d
r
ed
,
g
r
e
en
,
b
lu
e
f
ilter
s
with
co
n
s
id
er
in
g
m
ea
s
u
r
em
en
t
b
ased
o
n
th
e
an
g
le
a
n
d
th
e
f
lu
o
r
escen
t lig
h
ts
co
n
d
itio
n
s
.
2.
DE
S
I
G
N
AND
I
M
P
L
E
M
E
N
T
AT
I
O
N
2
.
1
.
Sy
s
t
e
m
des
ig
n
T
h
is
r
esear
ch
d
is
cu
s
s
es
h
o
w
th
e
VL
C
s
y
s
tem
wo
r
k
s
,
an
d
t
h
e
s
er
ies
o
f
th
is
r
esear
ch
is
s
h
o
wn
in
Fig
u
r
e
1
.
I
n
th
e
VL
C
b
lo
ck
tr
an
s
m
itter
s
ec
tio
n
ca
n
b
e
s
ee
n
th
e
p
r
o
ce
s
s
o
f
an
in
f
o
r
m
atio
n
s
ig
n
al
s
o
th
at
it
ca
n
b
e
tr
an
s
m
itted
.
I
n
p
u
t
s
ig
n
al
w
h
en
test
in
g
u
s
in
g
an
au
d
io
g
e
n
er
ato
r
in
t
h
e
f
o
r
m
o
f
an
an
al
o
g
s
ig
n
al
is
p
ass
ed
th
r
o
u
g
h
t
h
e
s
ig
n
al
co
n
d
itio
n
er
an
d
th
en
th
r
o
u
g
h
th
e
wh
ite
L
E
D
b
ef
o
r
e
b
ein
g
tr
an
s
m
itted
wh
er
e
t
h
e
wh
ite
L
E
D
is
g
iv
en
a
v
o
ltag
e
o
f
1
2
V.
T
h
e
lig
h
t
s
en
t
b
y
th
e
wh
ite
L
E
D
co
n
tain
s
in
f
o
r
m
atio
n
an
d
is
r
ec
eiv
ed
b
y
th
e
p
h
o
to
d
i
o
d
e
o
n
th
e
VL
C
r
ec
ei
v
er
with
a
wh
ite
VL
C
r
ec
eiv
er
v
o
ltag
e
o
f
9
V.
T
h
e
p
h
o
to
d
io
d
e
f
u
n
ctio
n
s
as
a
lig
h
t
-
r
ec
eiv
in
g
s
en
s
o
r
an
d
s
to
r
es
th
e
r
ec
eiv
ed
lig
h
t
en
er
g
y
an
d
co
n
v
er
ts
it
in
to
an
elec
tr
ical
s
ig
n
al,
th
en
en
ter
s
th
e
am
p
lifie
r
as
a
s
ig
n
al
am
p
l
if
ier
an
d
is
p
ass
ed
o
n
to
th
e
s
ig
n
al
co
n
d
itio
n
er
s
o
th
at
it
p
r
o
d
u
ce
s
th
e
d
esire
d
o
u
tp
u
t.
L
ig
h
t
d
ep
e
n
d
an
t
r
esis
to
r
(
L
DR
)
f
u
n
ctio
n
s
as
a
lig
h
t
r
ec
eiv
er
s
en
s
o
r
,
to
s
et
th
e
alar
m
s
y
s
tem
o
n
th
e
VL
C
r
ec
eiv
er
will
th
en
en
ter
th
e
tim
er
cir
cu
it,
wh
er
e
th
e
tim
er
cir
c
u
it
will
r
esp
o
n
d
to
th
e
lig
h
t
r
ec
eiv
ed
b
y
th
e
L
DR
,
th
e
o
u
tp
u
t
p
r
o
d
u
ce
d
in
th
e
f
o
r
m
o
f
an
alar
m
s
o
u
n
d
o
n
th
e
b
u
zz
er
.
Fig
u
r
e
1
.
C
ir
cu
it
s
y
s
tem
b
lo
ck
Evaluation Warning : The document was created with Spire.PDF for Python.
T
E
L
KOM
NI
KA
T
elec
o
m
m
u
n
C
o
m
p
u
t E
l Co
n
tr
o
l
Lig
h
t fo
llo
w
er sys
te
ms fo
r
vi
s
u
a
lly
imp
a
ir
ed
u
s
in
g
visi
b
le
lig
h
t c
o
mmu
n
ica
tio
n
(
A
r
s
ya
d
R
a
ma
d
h
a
n
Da
r
lis
)
11
2
.
2
.
P
r
o
t
o
t
y
pe
des
ig
n
T
h
e
wo
o
d
m
ater
ial
is
u
s
ed
to
m
ak
e
th
e
p
r
o
to
ty
p
e
VL
C
tr
an
s
m
itter
.
T
h
e
L
E
Ds
ar
e
in
s
tal
led
alo
n
g
with
th
e
p
r
o
to
t
y
p
e
VL
C
tr
an
s
m
itter
wh
ile
th
e
VL
C
tr
an
s
m
itter
is
in
s
talled
at
ev
er
y
b
en
d
o
n
th
e
p
r
o
to
t
y
p
e,
m
ea
n
wh
ile,
th
e
b
ase
co
lo
r
ac
r
y
lic
will
b
e
in
s
talled
ab
o
v
e
to
c
o
v
er
th
e
L
E
D
m
o
u
n
tin
g
p
ath
.
T
h
e
VL
C
tr
an
s
m
itter
d
esig
n
i
s
s
h
o
wn
in
Fig
u
r
e
2
.
T
h
e
v
is
u
ally
im
p
air
ed
s
tick
u
s
ed
is
a
ty
p
e
o
f
n
am
ed
s
tick
th
at
ca
n
b
e
f
o
ld
ed
an
d
h
as
a
len
g
th
o
f
1
2
0
c
m
.
T
h
e
VL
C
r
ec
eiv
er
is
in
s
talled
in
a
b
o
x
th
at
is
co
n
n
ec
ted
to
th
e
v
is
u
ally
im
p
air
ed
r
o
d
,
wh
ile
th
e
ca
s
to
r
wh
ee
ls
ar
e
m
o
u
n
ted
o
n
th
e
s
tick
to
f
ac
ilit
ate
th
e
v
is
u
ally
im
p
air
ed
in
ca
r
r
y
in
g
o
u
t
th
is
to
o
l.
T
h
e
d
esig
n
o
f
th
e
v
is
u
ally
im
p
air
ed
s
tick
is
s
h
o
wn
in
Fig
u
r
e
3
.
Fig
u
r
e
2
.
VL
C
tr
an
s
m
itter
p
r
o
to
ty
p
e
Fig
u
r
e
3
.
T
h
e
p
r
o
to
ty
p
e
d
esig
n
o
f
b
lin
d
s
tick
as VL
C
r
ec
eiv
er
2
.
3
.
P
r
o
t
o
t
y
pe
im
plem
ent
a
t
i
o
n
T
h
e
VL
C
T
r
an
s
m
itter
cir
cu
it
aim
s
to
s
en
d
in
f
o
r
m
atio
n
s
ig
n
als
em
itted
th
r
o
u
g
h
L
E
Ds
in
th
e
f
o
r
m
o
f
v
is
ib
le
lig
h
t
.
T
h
e
in
p
u
t
s
ig
n
al
u
s
ed
in
th
is
cir
cu
it
co
m
es
f
r
o
m
an
au
d
i
o
g
en
e
r
ato
r
with
a
f
r
eq
u
en
c
y
o
f
3
k
Hz.
T
h
e
VL
C
tr
an
s
m
itter
cir
cu
it
i
s
g
iv
en
a
v
o
ltag
e
o
f
1
2
V,
wh
ile
f
o
r
f
ilter
in
g
u
n
wa
n
ted
s
ig
n
als,
th
e
in
p
u
t
s
ig
n
al
f
r
o
m
t
h
e
au
d
io
g
en
er
ato
r
will
p
ass
th
r
o
u
g
h
th
e
b
an
d
p
ass
f
ilter
b
ef
o
r
e
b
ein
g
t
r
an
s
m
itted
th
r
o
u
g
h
th
e
lig
h
t
with
a
wh
ite
L
E
D.
T
h
e
in
p
u
t
s
ig
n
al
tr
an
s
m
itted
b
y
t
h
e
VL
C
tr
a
n
s
m
itter
ca
n
b
e
s
ee
n
u
s
in
g
a
n
o
s
cillo
s
co
p
e.
T
h
e
cir
cu
it a
n
d
im
p
le
m
en
tatio
n
o
f
th
e
VL
C
tr
an
s
m
itter
ar
e
s
h
o
wn
in
Fig
u
r
e
4
.
VL
C
R
ec
eiv
er
cir
cu
it
is
in
ten
d
ed
to
r
ec
eiv
e
i
n
f
o
r
m
atio
n
s
i
g
n
als
em
i
tted
f
r
o
m
th
e
VL
C
tr
an
s
m
itter
th
r
o
u
g
h
t
h
e
wh
ite
L
E
D
in
t
h
e
f
o
r
m
o
f
v
is
ib
le
lig
h
t.
VL
C
r
ec
eiv
er
cir
c
u
it
co
n
s
is
ts
o
f
s
ev
er
al
elec
tr
o
n
ic
co
m
p
o
n
en
ts
s
u
ch
as
p
h
o
to
d
io
d
e
an
d
am
p
lifie
r
cir
cu
it,
th
e
i
n
f
o
r
m
atio
n
s
ig
n
al
s
en
t
b
y
th
e
tr
an
s
m
itter
will
b
e
r
ec
eiv
ed
b
y
t
h
e
p
h
o
t
o
d
io
d
e
o
n
th
e
VL
C
r
ec
eiv
er
.
T
h
e
p
h
o
to
d
io
d
e
in
th
is
cir
cu
it
f
u
n
ctio
n
s
as
a
lig
h
t
-
r
ec
eiv
in
g
s
en
s
o
r
an
d
s
to
r
es
th
e
r
ec
ei
v
ed
lig
h
t
en
e
r
g
y
,
an
d
co
n
v
er
ts
it
i
n
to
an
elec
tr
ical
s
ig
n
al,
t
h
en
e
n
ter
s
th
e
am
p
lifie
r
cir
cu
it a
s
a
s
ig
n
al
am
p
lifie
r
.
T
h
e
o
u
tp
u
t sig
n
al
r
ec
eiv
ed
b
y
t
h
e
r
ec
eiv
er
ca
n
b
e
s
ee
n
u
s
in
g
an
o
s
cillo
s
co
p
e
. T
h
e
VL
C
r
ec
eiv
er
cir
cu
it
ca
n
r
ec
eiv
e
s
ig
n
als
well
u
s
in
g
a
v
o
ltag
e
o
f
9
V
.
T
h
e
cir
cu
it
an
d
im
p
lem
en
tatio
n
o
f
th
e
VL
C
r
ec
eiv
er
is
s
h
o
wn
in
Fig
u
r
e
5
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
1
6
9
3
-
6
9
3
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9
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No
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1
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Feb
r
u
ar
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202
1
:
9
-
18
12
(
a)
(
b
)
(
c)
Fig
u
r
e
4
.
(
a
)
VL
C
tr
an
s
m
itter
cir
cu
it
[
5
]
,
(
b
)
C
ir
cu
it
i
m
p
le
m
en
tatio
n
,
(
c)
Path
i
m
p
lem
en
tat
io
n
(
a)
(
b
)
(
c)
Fig
u
r
e
5
.
(
a
)
VL
C
r
ec
eiv
er
cir
cu
it
[
5
]
,
(
b
)
C
ir
cu
it
i
m
p
lem
e
n
t
atio
n
,
(
c)
Sti
ck
i
m
p
lem
en
tatio
n
2
.
4
.
Ala
r
m
s
y
s
t
em
im
plem
e
nta
t
io
n
T
h
is
alar
m
s
y
s
tem
cir
cu
it
s
er
v
es
to
d
etec
t
lig
h
t
s
o
th
at
th
e
b
lin
d
ca
n
f
o
llo
w
th
e
p
ath
in
th
e
s
u
p
er
m
ar
k
et
p
r
o
p
er
l
y
.
T
h
is
cir
cu
it
is
in
s
talled
o
n
th
e
VL
C
r
ec
eiv
er
.
W
h
en
th
e
ala
r
m
is
tu
r
n
ed
o
n
with
a
v
o
ltag
e
o
f
9
V,
th
e
L
DR
will
d
etec
t
th
e
r
ec
eiv
ed
li
g
h
t.
I
f
th
e
lig
h
t
f
alls
o
n
th
e
L
D
R
,
th
e
r
esis
tan
ce
o
f
th
e
L
DR
w
ill
d
ec
r
ea
s
e
s
o
th
at
th
e
b
u
zz
e
r
will
n
o
t
s
o
u
n
d
.
W
h
en
th
e
L
DR
d
o
es
n
o
t
r
ec
eiv
e
lig
h
t,
t
h
e
r
esis
tan
ce
o
f
th
e
L
DR
will
in
cr
ea
s
e,
ca
u
s
in
g
th
e
b
u
zz
er
to
s
o
u
n
d
.
T
h
e
s
er
ies an
d
im
p
lem
en
tatio
n
o
f
th
e
alar
m
s
y
s
tem
is
s
h
o
wn
in
Fig
u
r
e
6
.
(
a)
(
b
)
(
c)
(
d
)
Fig
u
r
e
6
.
(
a
)
Alar
m
s
y
s
tem
cir
cu
it
,
(
b
)
Alar
m
cir
cu
it im
p
lem
en
tatio
n
,
(
c)
B
u
zz
er
L
f
-
MB2
6
,
(
d
)
L
DR
Or
p
1
2
2
.
5
.
VL
C
t
ra
ns
m
it
t
er
a
nd
re
ce
iv
er
inte
g
ra
t
io
n
Af
ter
im
p
lem
en
tin
g
th
e
VL
C
tr
an
s
m
itter
an
d
VL
C
r
ec
eiv
e
r
,
th
e
n
ex
t
s
tep
is
to
i
n
teg
r
ate
th
e
VL
C
tr
an
s
m
itter
an
d
VL
C
r
ec
eiv
er
,
as
s
h
o
wn
in
Fig
u
r
e
7
.
Fig
u
r
e
7
s
h
o
ws
th
e
in
teg
r
atio
n
o
f
th
e
VL
C
tr
an
s
m
itter
with
th
e
VL
C
r
ec
eiv
er
u
s
in
g
r
ed
ac
r
y
lic.
T
h
e
v
is
u
ally
i
m
p
ai
r
ed
s
tick
as
a
r
ec
eiv
er
will
r
ec
eiv
e
an
in
f
o
r
m
atio
n
s
ig
n
al
f
r
o
m
t
h
e
VL
C
tr
an
s
m
itter
m
o
u
n
ted
o
n
th
e
r
ed
lin
e
at
t
h
e
cr
o
s
s
in
g
p
o
in
t.
T
h
e
in
f
o
r
m
atio
n
s
en
t
is
in
th
e
f
o
r
m
o
f
a
n
au
d
io
s
o
u
n
d
r
ec
o
r
d
in
g
i
n
s
talled
o
n
an
MP
3
p
l
ay
er
.
Nev
e
r
th
eless
,
in
th
e
p
r
esen
t
r
esear
ch
,
th
e
in
f
o
r
m
atio
n
s
en
t
is
i
n
th
e
f
o
r
m
o
f
an
in
f
o
r
m
atio
n
s
ig
n
al
co
m
in
g
f
r
o
m
t
h
e
a
u
d
io
g
en
e
r
ato
r
.
I
n
f
o
r
m
atio
n
r
ec
eiv
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b
y
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e
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is
u
ally
im
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o
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e
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y
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e
b
lin
d
u
s
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g
a
h
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d
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et.
W
h
ile
th
e
in
f
o
r
m
atio
n
s
ig
n
al
f
r
o
m
t
h
e
au
d
io
g
e
n
er
ato
r
th
at
is
r
ec
eiv
ed
b
y
th
e
v
is
u
ally
Evaluation Warning : The document was created with Spire.PDF for Python.
T
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L
KOM
NI
KA
T
elec
o
m
m
u
n
C
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p
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Lig
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w
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te
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ica
tio
n
(
A
r
s
ya
d
R
a
ma
d
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a
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Da
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lis
)
13
im
p
air
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tick
as
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r
ec
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at
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tim
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o
f
th
e
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tu
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e
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en
o
n
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cillo
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p
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th
e
alar
m
s
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tem
in
s
talled
o
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VL
C
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ec
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will
m
a
k
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alar
m
s
o
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n
d
w
h
e
n
th
e
v
is
u
ally
im
p
air
ed
s
tick
ex
its
t
h
e
r
ed
ac
r
y
lic
p
ath
,
in
d
icatin
g
th
at
th
e
v
is
u
ally
im
p
air
ed
p
er
s
o
n
ex
its
th
e
s
p
ec
if
i
ed
way
.
W
h
er
ea
s
if
th
e
v
is
u
al
ly
im
p
air
ed
s
tick
is
o
n
th
e
r
i
g
h
t tr
ac
k
b
y
f
o
llo
win
g
th
e
r
ed
ac
r
y
lic
p
ath
,
th
e
alar
m
s
y
s
tem
will n
o
t e
m
it
an
alar
m
s
o
u
n
d
.
Fig
u
r
e
7
.
VL
C
tr
an
s
m
itter
d
a
n
VL
C
r
ec
eiv
er
in
teg
r
atio
n
3.
RE
SU
L
T
S
A
ND
AN
AL
Y
SI
S
Af
ter
im
p
lem
en
tin
g
th
e
s
y
s
tem
s
,
th
e
n
ex
t
s
tep
is
to
m
ea
s
u
r
e
an
d
r
etr
iev
e
d
ata
f
r
o
m
th
e
s
y
s
tem
.
Me
asu
r
in
g
an
d
d
ata
r
etr
ie
v
al
is
ca
r
r
ied
o
u
t,
aim
in
g
to
o
b
t
ain
d
ata
th
at
ca
n
b
e
co
m
p
ar
e
d
to
d
eter
m
in
e
th
e
p
er
f
o
r
m
an
ce
o
f
th
e
s
y
s
tem
s
th
at
h
av
e
b
ee
n
m
ad
e
.
T
h
e
m
ea
s
u
r
em
en
t
m
eth
o
d
is
d
o
n
e
co
n
s
id
er
in
g
s
y
s
tem
an
g
le,
u
s
e
th
e
f
ilter
,
f
r
e
q
u
en
c
y
b
o
t
h
with
o
u
t
an
d
u
s
in
g
n
e
o
n
l
ig
h
ts
.
3
.
1
.
Ang
le
ba
s
ed
m
ea
s
urement
wit
ho
ut
t
he
ef
f
ec
t
o
f
neo
n lig
hts
T
h
is
m
ea
s
u
r
em
en
t
aim
s
to
d
e
ter
m
in
e
th
e
r
eliab
ilit
y
o
f
th
e
s
y
s
tem
in
s
en
d
in
g
an
d
r
ec
eiv
in
g
au
d
i
o
s
ig
n
als
in
s
u
p
er
m
a
r
k
ets.
A
s
ig
n
al
with
a
f
r
eq
u
en
cy
o
f
3
k
Hz
is
g
en
er
ated
b
y
u
s
in
g
an
au
d
io
g
en
er
at
o
r
,
an
d
th
e
r
ef
er
en
ce
v
o
ltag
e
ap
p
lied
is
5
Vp
-
p
.
T
h
is
m
ea
s
u
r
em
en
t
u
s
e
d
ac
r
y
lic
r
ed
,
g
r
ee
n
,
b
lu
e
wit
h
an
g
les
o
f
3
0
-
90
0
.
Me
asu
r
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en
ts
ar
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u
r
i
n
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th
e
d
ay
in
r
o
o
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co
n
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itio
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s
with
o
u
t
f
lu
o
r
escen
t
lig
h
tin
g
,
as
illu
s
tr
ated
in
Fig
u
r
e
8
.
Fro
m
th
e
g
r
ap
h
in
Fig
u
r
e
9
(
a)
,
th
e
r
esu
lts
o
f
m
ea
s
u
r
em
en
ts
in
th
is
s
y
s
tem
s
h
o
w
th
at
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ed
ac
r
y
lic
m
ea
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u
r
em
en
ts
ar
e
b
etter
th
an
g
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ee
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lu
e
ac
r
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T
h
is
is
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ec
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s
e
th
e
ty
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e
o
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with
ty
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e
SF
H
2
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as
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en
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itiv
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elen
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e
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h
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p
e
o
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ig
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f
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o
m
m
ea
s
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r
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e
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s
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with
a
n
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o
f
9
0
0
is
s
h
o
wn
in
Fig
u
r
e
9
(
b
)
.
I
t
s
h
o
ws
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e
s
ig
n
al
h
as
th
e
s
am
e
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h
ap
e
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etwe
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e
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ig
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an
s
m
itted
an
d
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ec
e
iv
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with
o
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t a
n
o
is
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with
th
e
s
ig
n
al
s
h
if
tin
g
.
(
a)
(
b
)
(
c)
Fig
u
r
e
8
.
Pro
t
o
ty
p
e
m
ea
s
u
r
em
en
t w
ith
o
u
t th
e
ef
f
ec
t o
f
n
eo
n
lig
h
ts
u
s
in
g
;
(
a)
r
ed
ac
r
y
lic
,
(
b
)
g
r
ee
n
ac
r
y
lic
,
(
c)
b
l
u
e
ac
r
y
lic
(
a)
(
b
)
Fig
u
r
e
9
.
Me
asu
r
em
e
n
t
r
esu
lts
with
o
u
t e
f
f
ec
ts
o
f
n
eo
n
lig
h
ts
;
(
a)
u
s
in
g
r
ed
,
g
r
ee
n
,
b
lu
e
ac
r
y
lic
,
(
b
)
s
ig
n
al
s
h
ap
e
u
s
in
g
9
0
0
r
ed
ac
r
y
lic
an
g
les
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
1
6
9
3
-
6
9
3
0
T
E
L
KOM
NI
KA
T
elec
o
m
m
u
n
C
o
m
p
u
t E
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n
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o
l
,
Vo
l.
1
9
,
No
.
1
,
Feb
r
u
ar
y
202
1
:
9
-
18
14
3
.
2
.
Ang
le
ba
s
ed
m
ea
s
urement
wit
h e
f
f
ec
t
s
o
f
neo
n lig
ht
s
T
h
is
m
ea
s
u
r
em
en
t
aim
s
to
d
eter
m
in
e
th
e
ef
f
ec
t
o
f
f
l
u
o
r
escen
t
lig
h
ts
in
a
r
o
o
m
,
esp
ec
ially
in
s
u
p
er
m
ar
k
ets,
o
n
th
e
r
eliab
ilit
y
o
f
t
h
e
s
y
s
tem
in
s
en
d
i
n
g
a
n
d
r
ec
eiv
in
g
s
ig
n
als
at
a
f
r
e
q
u
en
cy
o
f
3
k
Hz.
At
th
e
s
am
e
tim
e,
th
e
r
ef
er
en
ce
v
o
lta
g
e
u
s
ed
is
5
Vp
-
p
s
et
o
n
th
e
au
d
io
g
en
er
ato
r
.
T
h
is
m
ea
s
u
r
em
en
t
u
s
ed
ac
r
y
lic
r
ed
,
g
r
ee
n
,
b
lu
e
with
an
g
les
o
f
3
0
-
90
0
.
T
h
is
m
ea
s
u
r
em
en
t
is
ca
r
r
ied
o
u
t
at
n
ig
h
t
in
a
r
o
o
m
with
f
lu
o
r
escen
t
lig
h
t,
as
illu
s
tr
ated
in
Fig
u
r
e
1
0
.
(
a)
(
b
)
(
c)
Fig
u
r
e
1
0
.
T
h
e
p
r
o
to
ty
p
e
o
f
m
ea
s
u
r
em
en
t b
y
ef
f
ec
t o
f
n
eo
n
l
ig
h
ts
u
s
in
g
;
(
a)
r
ed
ac
r
y
lic
,
(
b
)
g
r
ee
n
ac
r
y
lic
,
(
c)
b
l
u
e
ac
r
y
lic
B
ased
o
n
th
e
g
r
a
p
h
i
n
Fig
u
r
e
1
1
(
a
)
,
th
e
r
esu
lts
o
f
m
ea
s
u
r
e
m
en
ts
o
n
th
is
s
y
s
tem
s
h
o
w
th
a
t th
e
q
u
ality
o
f
r
e
d
ac
r
y
lic
is
b
etter
th
a
n
g
r
ee
n
an
d
b
lu
e
ac
r
y
lic.
T
h
is
is
d
u
e
to
t
h
e
in
f
l
u
en
ce
o
f
f
lu
o
r
esc
en
t
lam
p
s
,
an
d
th
e
ty
p
e
o
f
p
h
o
to
d
i
o
d
e
u
s
ed
is
SF
H
2
0
3
.
Ph
o
to
d
io
d
e
wi
th
SF
H
2
0
3
h
as
g
o
o
d
s
en
s
itiv
ity
to
r
ed
c
o
lo
r
with
a
wav
elen
g
th
o
f
6
2
0
-
7
5
0
n
m
.
T
h
e
s
h
ap
e
o
f
th
e
s
ig
n
al
f
r
o
m
m
e
asu
r
em
en
ts
u
s
in
g
r
ed
ac
r
y
lic
with
th
e
in
f
l
u
en
ce
o
f
f
lu
o
r
escen
t
lig
h
ts
at
an
an
g
le
o
f
9
0
0
is
s
h
o
wn
in
Fig
u
r
e
1
1
(
b
)
.
T
h
e
f
ig
u
r
e
s
h
o
ws
th
e
s
ig
n
a
l
h
as
atten
u
atio
n
in
th
e
s
ig
n
al
o
u
tp
u
t.
Ho
wev
er
,
t
h
e
s
am
e
s
h
ap
e
is
s
h
o
wn
b
etwe
en
th
e
s
ig
n
al
tr
an
s
m
itted
a
n
d
r
ec
eiv
ed
with
o
u
t
n
o
is
e.
Fro
m
th
e
r
esu
lts
o
f
m
ea
s
u
r
em
en
ts
u
s
in
g
ac
r
y
lic,
a
g
r
a
p
h
ca
n
b
e
m
ad
e
to
co
m
p
ar
e
th
e
q
u
ality
o
f
m
ea
s
u
r
em
en
ts
with
o
u
t
t
h
e
in
f
l
u
en
ce
o
f
f
l
u
o
r
escen
t
lam
p
s
in
Fig
u
r
e
9
(
a)
,
an
d
m
ea
s
u
r
em
e
n
ts
with
th
e
im
p
ac
t
o
f
n
eo
n
lig
h
ts
in
Fig
u
r
e
1
1
(
a)
b
y
tak
in
g
r
ef
er
e
n
ce
s
u
s
in
g
r
e
d
ac
r
y
lic
is
s
h
o
wn
in
Fig
u
r
e
1
2
.
(
a)
(
b
)
Fig
u
r
e
1
1
.
(
a)
Me
asu
r
em
e
n
t c
h
ar
t u
s
in
g
r
e
d
,
g
r
ee
n
,
b
lu
e
ac
r
y
lic
with
ef
f
ec
t o
f
n
eo
n
lig
h
ts
,
(
b
)
S
h
ap
e
o
f
m
ea
s
u
r
em
en
t sig
n
al
u
s
in
g
ac
r
y
lic
r
ed
9
0
0
with
ef
f
ec
t o
f
n
eo
n
lig
h
ts
Fro
m
th
e
g
r
ap
h
,
i
n
Fig
u
r
e
1
2,
th
e
r
esu
lts
o
f
m
ea
s
u
r
em
e
n
ts
in
th
is
s
y
s
tem
s
h
o
w
th
e
q
u
ality
o
f
m
ea
s
u
r
em
en
ts
with
th
e
in
f
lu
e
n
ce
o
f
f
lu
o
r
escen
t
lam
p
s
is
b
etter
th
an
m
ea
s
u
r
em
en
ts
with
o
u
t
th
e
in
f
lu
e
n
ce
o
f
f
lu
o
r
escen
t
lam
p
s
.
B
ased
o
n
Fig
u
r
e
1
2
,
it
ca
n
b
e
s
ee
n
th
a
t
th
e
m
ea
s
u
r
em
en
t
with
ef
f
ec
t
f
lu
o
r
escen
t
lam
p
p
r
o
d
u
ce
s
7
.
1
9
Vp
-
p
at
th
e
an
g
le
7
0
0
,
m
ea
n
wh
ile
with
o
u
t
e
f
f
ec
t
f
lu
o
r
escen
t
p
r
o
d
u
ce
s
6
.
7
1
Vp
-
p
at
th
e
a
n
g
le
70
0
C
.
T
h
is
co
n
d
itio
n
h
ap
p
e
n
e
d
is
d
u
e
to
th
e
im
p
ac
t
o
f
f
lu
o
r
escen
t
lam
p
s
o
n
th
is
m
ea
s
u
r
em
en
t
ca
n
in
cr
ea
s
e
v
o
ltag
e
s
tr
en
g
th
e
n
in
g
.
Evaluation Warning : The document was created with Spire.PDF for Python.
T
E
L
KOM
NI
KA
T
elec
o
m
m
u
n
C
o
m
p
u
t E
l Co
n
tr
o
l
Lig
h
t fo
llo
w
er sys
te
ms fo
r
vi
s
u
a
lly
imp
a
ir
ed
u
s
in
g
visi
b
le
lig
h
t c
o
mmu
n
ica
tio
n
(
A
r
s
ya
d
R
a
ma
d
h
a
n
Da
r
lis
)
15
Fig
u
r
e
1
2
.
Me
asu
r
em
en
t
c
h
ar
t
s
with
ef
f
ec
ts
o
f
n
eo
n
lig
h
ts
an
d
with
o
u
t e
f
f
ec
ts
o
f
n
e
o
n
lig
h
t
s
3
.
3
.
M
ea
s
urem
ent
us
ing
f
ilte
rs wit
ho
ut
t
he
influence
o
f
neo
n lig
hts
T
h
is
m
ea
s
u
r
em
en
t
aim
s
to
d
et
er
m
in
e
th
e
r
eliab
ilit
y
o
f
th
e
s
y
s
tem
in
s
en
d
in
g
an
d
r
ec
eiv
in
g
s
ig
n
als
at
a
f
r
eq
u
e
n
cy
o
f
3
k
Hz,
wh
ile
t
h
e
r
ef
er
en
ce
v
o
ltag
e
u
s
ed
is
5
Vp
-
p
.
T
h
is
m
ea
s
u
r
em
e
n
t
u
s
ed
f
il
ter
s
an
d
ac
r
y
lic
r
ed
,
g
r
ee
n
,
b
l
u
e
with
an
g
les
o
f
3
0
-
90
0
.
T
h
is
m
ea
s
u
r
em
e
n
t
is
ca
r
r
ied
o
u
t
d
u
r
i
n
g
th
e
d
ay
in
a
r
o
o
m
with
th
e
n
eo
n
lig
h
ts
tu
r
n
ed
o
f
f
.
Fig
u
r
e
1
3
s
h
o
ws
th
e
u
s
e
o
f
r
ed
,
g
r
ee
n
,
b
lu
e
f
ilter
s
in
s
talled
o
n
th
e
VL
C
r
ec
eiv
er
.
Fro
m
th
e
r
esu
lts
o
f
m
e
asu
r
em
en
ts
with
o
u
t
th
e
in
f
l
u
en
ce
o
f
f
lu
o
r
escen
t
lam
p
s
u
s
in
g
r
ed
,
g
r
ee
n
,
an
d
b
lu
e
f
ilter
s
,
a
g
r
ap
h
ca
n
b
e
m
ad
e
to
co
m
p
ar
e
th
e
q
u
ality
o
f
a
g
o
o
d
f
ilter
f
o
r
th
is
s
y
s
tem
b
y
u
s
in
g
th
e
r
ed
ac
r
y
lic
m
ea
s
u
r
em
en
t
as
a
r
ef
er
en
ce
is
s
h
o
wn
i
n
Fig
u
r
e
1
4
.
T
h
e
r
esu
lts
o
f
m
ea
s
u
r
em
en
ts
o
n
th
is
s
y
s
tem
s
h
o
w
th
e
q
u
ality
o
f
th
e
r
e
d
f
ilter
is
b
etter
th
a
n
th
e
f
ilter
g
r
ee
n
an
d
b
lu
e
.
W
e
h
av
e
s
ee
n
f
r
o
m
Fig
u
r
e
1
5
th
e
r
ed
f
ilter
with
9
0
0
an
g
les
o
f
6
.
3
2
Vp
-
p
an
d
th
e
g
r
ee
n
f
ilter
with
9
0
0
an
g
les
o
f
3
.
2
0
Vp
-
p
wh
ile
th
e
b
lu
e
f
ilter
with
9
0
0
an
g
les
o
f
5
.
1
9
Vp
-
p
.
T
h
is
is
b
ec
au
s
e
th
e
ty
p
e
o
f
p
h
o
to
d
i
o
d
e
u
s
ed
is
SF
H
2
0
3
.
Ph
o
to
d
io
d
e
with
SF
H
2
0
3
h
as
g
o
o
d
s
en
s
itiv
ity
to
r
ed
co
lo
r
w
ith
a
wav
elen
g
th
o
f
620
-
7
5
0
n
m
.
T
h
e
s
h
ap
e
o
f
th
e
s
ig
n
al
f
r
o
m
m
ea
s
u
r
em
en
ts
u
s
i
n
g
a
r
e
d
f
ilter
with
o
u
t
th
e
in
f
lu
en
ce
o
f
f
lu
o
r
escen
t
lig
h
ts
at
an
an
g
le
o
f
9
0
0
is
s
ee
n
in
Fig
u
r
e
15
.
I
t
h
as
s
h
o
wn
th
e
s
ig
n
al
h
av
e
am
p
lific
atio
n
f
r
o
m
th
e
tr
an
s
m
itted
s
ig
n
al
with
o
u
t e
x
ter
n
al
i
n
ter
f
e
r
en
ce
.
Fig
u
r
e
1
3
.
Me
asu
r
em
en
t w
ith
o
u
t th
e
ef
f
ec
t o
f
u
s
in
g
n
eo
n
lig
h
ts
f
ilter
r
ed
,
g
r
ee
n
,
b
lu
e
Fig
u
r
e
1
4
.
Me
asu
r
em
en
t c
h
ar
t
u
s
in
g
r
ed
,
g
r
ee
n
,
b
lu
e
f
ilter
s
with
o
u
t th
e
ef
f
ec
t o
f
n
e
o
n
lig
h
ts
Fig
u
r
e
15
.
Me
asu
r
em
en
t
s
ig
n
a
ls
u
s
in
g
r
ed
f
ilter
s
with
9
0
0
a
n
g
le
with
o
u
t th
e
ef
f
ec
t o
f
n
eo
n
lig
h
ts
3
.
4
.
M
ea
s
urem
ent
us
ing
a
f
i
lt
er
wit
h t
he
ef
f
ec
t
o
f
neo
n lig
hts
T
h
is
m
ea
s
u
r
em
en
t
ai
m
s
to
d
e
ter
m
in
e
th
e
r
eliab
ilit
y
o
f
th
e
s
y
s
tem
in
s
en
d
in
g
an
d
r
ec
eiv
i
n
g
s
ig
n
als
u
s
in
g
r
ed
,
g
r
ee
n
,
a
n
d
b
l
u
e
f
ilter
s
with
th
e
in
f
lu
en
ce
o
f
f
lu
o
r
escen
t
lam
p
s
at
a
f
r
eq
u
en
c
y
o
f
3
k
Hz.
I
n
c
o
n
tr
ast,
th
e
r
ef
e
r
en
ce
v
o
ltag
e
a
p
p
lied
i
s
5
Vp
-
p
.
T
h
is
m
ea
s
u
r
em
en
t
u
s
ed
f
ilter
s
an
d
ac
r
y
lic
r
e
d
,
g
r
e
en
,
b
l
u
e
with
an
g
les
o
f
3
0
-
90
0
.
T
h
is
m
ea
s
u
r
em
en
t
i
s
ca
r
r
ied
o
u
t
o
n
e
v
en
d
ay
s
in
a
r
o
o
m
with
f
lu
o
r
escen
t
lig
h
t.
F
ig
u
r
e
16
s
h
o
ws th
e
u
s
e
o
f
r
ed
,
g
r
ee
n
,
b
lu
e
f
ilter
s
in
s
talled
o
n
VL
C
r
ec
eiv
er
s
with
th
e
in
f
lu
e
n
ce
o
f
f
lu
o
r
escen
t la
m
p
s
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
1
6
9
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Feb
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202
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9
-
18
16
B
ased
o
n
th
e
m
ea
s
u
r
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en
t
r
es
u
lts
u
s
in
g
r
ed
,
g
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ee
n
,
an
d
b
lu
e
f
ilter
s
with
th
e
in
f
lu
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ce
o
f
f
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ts
,
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g
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h
ca
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b
e
m
ad
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to
co
m
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ar
e
th
e
q
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ality
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f
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ex
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b
ase
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ilter
f
o
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th
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y
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tem
b
y
u
s
in
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t
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e
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ed
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m
ea
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u
r
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e
n
t a
s
a
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ef
er
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as sh
o
wn
in
Fig
u
r
e
17
.
I
n
Fig
u
r
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1
7
,
it c
an
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o
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at
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ality
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at
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ased
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u
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al
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r
o
m
m
ea
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u
r
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s
in
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a
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ed
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ce
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n
eo
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h
t
at
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an
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f
9
0
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is
s
h
o
wn
in
Fig
u
r
e
18
.
Fro
m
th
e
r
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lts
o
f
m
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u
r
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n
ts
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s
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g
a
p
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im
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r
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in
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l
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lu
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p
s
in
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u
r
e
1
9
an
d
m
ea
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en
ts
with
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e
im
p
ac
t
o
f
n
eo
n
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h
ts
in
Fig
u
r
e
17
b
y
tak
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g
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er
en
ce
s
u
s
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t
h
e
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s
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o
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Fig
u
r
e
19
.
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h
e
r
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f
m
ea
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r
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e
n
ts
in
th
is
s
y
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tem
s
h
o
w
th
e
q
u
ality
o
f
m
ea
s
u
r
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en
ts
with
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u
t
th
e
in
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ce
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f
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o
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s
is
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etter
th
an
m
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u
r
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en
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with
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e
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ce
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s
.
W
e
h
av
e
s
ee
n
f
r
o
m
Fig
u
r
e
2
0
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with
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4
8
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n
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0
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1
5
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p
.
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est
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r
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q
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ality
with
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s
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in
Fig
u
r
e
2
0
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d
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ilter
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s
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u
r
e
2
1
g
r
ap
h
s
h
o
ws
th
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m
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u
r
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r
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t
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s
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ith
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f
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.
1
9
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p
a
n
d
m
ea
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r
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le
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0
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f
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.
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p
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h
e
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ea
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r
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s
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ality
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etter
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r
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m
en
ts
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ilter
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h
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s
e
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n
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h
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m
ea
s
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r
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t c
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r
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lt in
th
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atten
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atio
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o
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th
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v
o
ltag
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Fig
u
r
e
16
.
Me
asu
r
em
en
t o
f
th
e
ef
f
ec
t o
f
u
s
in
g
n
eo
n
lig
h
ts
f
ilter
r
ed
,
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r
ee
n
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l
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e
Fig
u
r
e
17
.
Me
asu
r
em
en
t c
h
ar
t
u
s
in
g
r
ed
,
g
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ee
n
,
b
lu
e
f
ilter
s
with
ef
f
ec
t o
f
n
e
o
n
lig
h
ts
Fig
u
r
e
18
.
Me
asu
r
em
en
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ig
n
a
ls
u
s
in
g
r
ed
f
ilter
s
,
with
ef
f
ec
ts
o
f
n
eo
n
lig
h
ts
at
9
0
0
an
g
le
Fig
u
r
e
19
.
Me
asu
r
em
en
t c
h
ar
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s
with
ef
f
ec
ts
o
f
n
eo
n
lig
h
ts
an
d
with
o
u
t e
f
f
ec
ts
o
f
n
eo
n
lig
h
ts
u
s
in
g
t
h
e
r
ed
f
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Fig
u
r
e
2
0
.
Me
asu
r
em
en
t
c
h
ar
t
u
s
in
g
f
ilter
s
an
d
with
o
u
t u
s
in
g
f
ilter
s
Evaluation Warning : The document was created with Spire.PDF for Python.
T
E
L
KOM
NI
KA
T
elec
o
m
m
u
n
C
o
m
p
u
t E
l Co
n
tr
o
l
Lig
h
t fo
llo
w
er sys
te
ms fo
r
vi
s
u
a
lly
imp
a
ir
ed
u
s
in
g
visi
b
le
lig
h
t c
o
mmu
n
ica
tio
n
(
A
r
s
ya
d
R
a
ma
d
h
a
n
Da
r
lis
)
17
3
.
5
.
Sy
s
t
e
m
m
e
a
s
urem
ent
ba
s
ed
o
n a
ng
le
wit
h f
re
qu
enc
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ra
ng
e
T
h
is
m
ea
s
u
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en
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aim
s
to
d
et
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m
in
e
th
e
r
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o
f
t
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s
y
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tem
in
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in
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d
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ig
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als
at
f
r
eq
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cies
f
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3
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3
4
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n
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n
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m
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is
u
s
ed
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a
r
ef
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e
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ce
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Fig
u
r
e
2
1
(
a)
s
h
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at
with
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f
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with
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th
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1
5
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als
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f
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0
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m
f
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f
3
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2
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in
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in
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q
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n
g
e
with
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ce
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th
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lam
p
at
an
a
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le
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f
9
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s
s
h
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wn
in
Fig
u
r
e
2
1
(
b
)
.
I
t
s
h
o
wed
t
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i
g
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etwe
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s
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itted
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d
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d
s
ig
n
al
with
o
u
t
n
o
is
e.
(
a)
(
b
)
Fig
u
r
e
2
1
.
(
a)
Me
asu
r
em
e
n
t c
h
ar
t w
ith
f
r
eq
u
en
cy
r
an
g
e
,
(
b
)
Sig
n
al
o
f
f
r
e
q
u
en
c
y
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e
m
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s
u
r
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en
t b
y
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f
ec
t
o
f
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ts
4.
CO
NCLU
SI
O
N
B
ased
o
n
o
u
r
w
o
r
k
e
d
,
it
ca
n
b
e
f
o
u
n
d
th
e
s
ev
e
r
al
co
n
c
lu
s
io
n
as
f
o
llo
w
;
(
a)
A
d
esi
g
n
ed
an
d
im
p
lem
en
ted
VL
C
tr
an
s
m
itter
an
d
VL
C
r
ec
ei
v
er
s
y
s
tem
c
an
tr
an
s
m
it
a
s
ig
n
al
with
a
s
o
u
n
d
f
r
e
q
u
en
c
y
o
f
3
0
0
0
Hz.
(
b
)
T
h
e
r
esu
lts
o
f
th
e
co
m
p
ar
is
o
n
b
etwe
en
m
ea
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r
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ts
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s
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g
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ed
,
g
r
ee
n
an
d
b
lu
e
ac
r
y
lic
with
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u
t
th
e
in
f
lu
en
ce
o
f
f
lu
o
r
escen
t
lig
h
t
in
g
an
d
with
th
e
in
f
lu
e
n
ce
o
f
f
lu
o
r
escen
t
lig
h
tin
g
s
h
o
w
th
at
th
e
q
u
ality
o
f
m
ea
s
u
r
em
en
ts
with
th
e
in
f
lu
e
n
ce
o
f
f
lu
o
r
escen
t
lam
p
s
is
b
etter
th
an
m
ea
s
u
r
em
en
ts
with
o
u
t
th
e
in
f
lu
e
n
ce
o
f
f
lu
o
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escen
t
L
am
p
s
,
an
d
th
e
v
o
ltag
e
o
u
p
u
t
with
an
an
g
le
7
0
0
is
eq
u
al
with
7
.
1
9
Vp
-
p.
(
c)
T
h
e
r
esu
lts
o
f
th
e
co
m
p
ar
is
o
n
b
etwe
en
m
ea
s
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r
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m
en
ts
u
s
in
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[1
]
Ha
ll
a
h
a
n
,
D.
P
.
,
Ka
u
ffm
a
n
,
J.
M
.
,
&
P
u
ll
e
n
,
P
.
C.
,
“
E
x
c
e
p
ti
o
n
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l
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rn
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rs:
An
in
tro
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c
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to
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c
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ti
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3
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h
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it
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o
n
,”
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p
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e
r S
a
d
d
le R
ive
r,
NJ
:
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rs
o
n
,
2
0
1
5
.
[2
]
Ab
d
u
rra
sy
id
A.,
I
n
d
r
ian
to
I
.
,
&
Aria
n
to
R.
,
“
De
tec
ti
o
n
o
f
imm
o
v
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le
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jec
ts
o
n
v
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u
a
ll
y
imp
a
ire
d
p
e
o
p
le
wa
lk
i
n
g
a
id
s
,”
T
EL
KOM
NIK
A
T
e
lec
o
mm
u
n
ica
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o
n
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mp
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ti
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tro
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ics
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n
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,
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.
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o
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0
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.
[3
]
S
iswo
n
o
H.
,
“
G
las
se
s
fo
r
th
e
b
li
n
d
u
si
n
g
p
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n
g
u
lt
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so
n
ic
,”
T
E
L
KOM
NIKA
T
e
lec
o
mm
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n
ica
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o
n
Co
m
p
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ti
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g
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l.
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,
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o
.
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,
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p
.
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.
Evaluation Warning : The document was created with Spire.PDF for Python.
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9
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1
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Feb
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202
1
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18
[4
]
M
a
’ru
f
M
.
I.
,
P
ra
m
o
n
o
S.
H
.
,
a
n
d
Oth
m
a
n
M
.
B.
,
Visib
le
Li
g
h
t
C
o
m
m
u
n
ica
ti
o
n
(VLC)
S
y
ste
m
fo
r
A
u
d
i
o
Tran
sm
issio
n
,”
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u
r
n
a
l
M
a
h
a
sisw
a
T
EUB
,
v
o
l.
3
,
n
o
.
3
,
2
0
1
5
.
[5
]
Da
rli
s
A.
R.
,
Li
d
y
a
wa
ti
L.
,
Tri
k
u
su
m
o
R
.
J.
,
“
Bid
irec
ti
o
n
a
l
Vi
d
e
o
Visib
le
Li
g
h
t
C
o
m
m
u
n
ica
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o
n
,”
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e
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tro
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n
ic
a
,
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tro
n
ica
,
Au
t
o
ma
t
ica
(E
EA
)
,
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l.
68
,
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o
.
2
,
p
p
.
85
-
92
,
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0
2
0
.
[6
]
Ku
m
a
r
N
.
,
&
Lo
u
re
n
ç
o
N.
R.
,
“
Led
-
Ba
se
d
Visib
le
Li
g
h
t
Co
m
m
u
n
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c
a
ti
o
n
S
y
ste
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:
A
Brief
S
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r
v
e
y
a
n
d
In
v
e
sti
g
a
ti
o
n
,”
J
o
u
rn
a
l
o
f
E
n
g
i
n
e
e
rin
g
a
n
d
A
p
p
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e
d
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c
ien
c
e
s
,
v
o
l.
5
,
p
p
.
2
9
6
-
3
0
7
,
2
0
1
0
.
[7
]
As
k
a
B
.
F
.
,
Da
rli
s
D.,
&
Ha
fi
d
d
u
d
i
n
,
“
Im
p
lem
e
n
tatio
n
o
f
Vis
ib
le
L
ig
h
t
Co
m
m
u
n
ica
ti
o
n
(VL
C)
fo
r
S
e
n
d
i
n
g
Da
ta
Dig
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a
l
,”
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d
i
D3
Fa
k
u
lt
a
s
Ilmu
T
e
ra
p
a
n
Un
ive
rs
it
a
s T
e
lk
o
m
,
2
0
1
5
.
[8
]
F
u
a
d
a
S
.
,
P
u
tra
A.
P
.
,
As
k
a
Y.,
&
Ad
io
n
o
T
.
,
“
No
ise
An
a
l
y
sis
o
f
Tran
s
-
imp
e
d
a
n
c
e
Am
p
li
fier
(
TI
A)
in
Va
riety
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p
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p
fo
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n
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le
Li
g
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(VLC)
S
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ste
m
,”
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ter
n
a
ti
o
n
a
l
J
o
u
r
n
a
l
o
f
El
e
c
trica
l
a
n
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Co
mp
u
ter
En
g
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n
e
e
rin
g
,
v
o
l.
8
,
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o
.
1
,
p
p
.
1
5
9
-
1
7
1
,
2
0
1
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.
[9
]
De
e
p
a
T.
,
M
a
th
u
r
H.,
&
S
u
n
i
t
h
a
K.
A.
,
“
S
p
e
c
trally
e
fficie
n
t
m
u
lt
ica
rrier
m
o
d
u
lati
o
n
sy
ste
m
fo
r
v
isi
b
le
li
g
h
t
c
o
m
m
u
n
ica
ti
o
n
,”
In
ter
n
a
ti
o
n
a
l
J
o
u
rn
a
l
o
f
El
e
c
trica
l
a
n
d
Co
m
p
u
ter
En
g
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n
e
e
rin
g
,
v
o
l.
9
,
n
o
.
2
,
p
p
.
1
1
8
4
-
1
1
9
0
,
2
0
1
9
.
[1
0
]
Qa
sim
A.
A.,
Ab
d
u
ll
a
h
M
.
F
.
L.
,
M
o
h
a
m
m
e
d
a
li
H.
N.
,
Tali
b
R
.
Bin
,
Ne
m
a
h
M
.
N.
,
&
Ha
m
m
o
o
d
i
A.
T.
,
“
Lo
w
c
o
m
p
lex
it
y
DCO
-
F
BM
C
v
isib
le
li
g
h
t
c
o
m
m
u
n
ica
ti
o
n
s
y
ste
m
,”
In
ter
n
a
ti
o
n
a
l
J
o
u
rn
a
l
o
f
El
e
c
trica
l
a
n
d
Co
m
p
u
ter
En
g
i
n
e
e
rin
g
,
v
o
l.
10
,
n
o
.
1
,
p
p
.
9
2
8
-
9
3
4
,
2
0
2
0
.
[1
1
]
Da
h
ri
F
.
A.,
Um
ra
n
i
F
.
A.,
Ba
q
a
i
A.,
&
M
a
n
g
ri
o
H.
B.
,
“
De
sig
n
a
n
d
imp
lem
e
n
tatio
n
o
f
L
ED
–
LE
D
in
d
o
o
r
v
isib
le
li
g
h
t
c
o
m
m
u
n
ica
ti
o
n
sy
ste
m
,”
Ph
y
sic
a
l
Co
mm
u
n
ica
ti
o
n
,
v
o
l
.
38
,
2
0
2
0
.
[1
2
]
P
e
n
g
X.
,
&
K
o
n
g
L.
,
“
De
sig
n
a
n
d
o
p
ti
m
iza
ti
o
n
o
f
o
p
t
ica
l
re
c
e
iv
in
g
a
n
ten
n
a
b
a
se
d
o
n
c
o
m
p
o
u
n
d
p
a
ra
b
o
li
c
c
o
n
c
e
n
trato
r
fo
r
in
d
o
o
r
v
isib
le
li
g
h
t
c
o
m
m
u
n
ic
a
ti
o
n
,”
O
p
ti
c
s Co
mm
u
n
ica
ti
o
n
s
,
v
o
l.
4
6
4
,
2
0
2
0
.
[1
3
]
Kiz
il
irma
k
R.
C.
,
“
Im
p
a
c
t
o
f
re
p
e
a
ters
o
n
t
h
e
p
e
rf
o
rm
a
n
c
e
o
f
i
n
d
o
o
r
v
isi
b
le
li
g
h
t
c
o
m
m
u
n
ica
ti
o
n
s
,”
T
u
rk
ish
J
o
u
rn
a
l
o
f
El
e
c
trica
l
En
g
in
e
e
rin
g
a
n
d
Co
mp
u
ter
S
c
ien
c
e
s,
v
o
l.
23
,
n
o
.
4
,
p
p
.
1
1
5
9
-
1
1
7
2
,
2
0
1
5
.
[1
4
]
Ba
n
d
a
ra
K.,
Niro
o
p
a
n
P
.
,
&
Ch
u
n
g
Y.
H.
,
“
Im
p
ro
v
e
d
i
n
d
o
o
r
v
isib
le
li
g
h
t
c
o
m
m
u
n
ica
ti
o
n
wit
h
P
A
M
a
n
d
RL
S
d
e
c
isio
n
fe
e
d
b
a
c
k
e
q
u
a
li
z
e
r
,”
IET
E
J
o
u
rn
a
l
o
f
Res
e
a
rc
h
,
v
o
l
.
59
,
n
o
.
6
,
p
p
.
672
-
6
7
8
,
2
0
1
3
.
[1
5
]
Ra
h
m
a
n
M
.
S
.
,
&
Kim
K.
D.
,
“
I
n
d
o
o
r
lo
c
a
ti
o
n
e
stim
a
ti
o
n
u
si
n
g
v
isib
le
li
g
h
t
c
o
m
m
u
n
ica
ti
o
n
a
n
d
ima
g
e
se
n
so
rs
,”
In
ter
n
a
t
io
n
a
l
J
o
u
rn
a
l
o
f
S
ma
rt H
o
me
,
v
o
l.
7
,
n
o
.
1
,
p
p
.
99
-
1
1
4
,
2
0
1
3
.
[1
6
]
Yi
Y.,
Li
C
.
,
&
Lee
K.
,
“
Op
ti
m
u
m
sp
re
a
d
c
o
d
e
a
p
p
li
e
d
in
in
d
o
o
r
v
isib
le
l
ig
h
t
d
a
ta
tran
sm
issio
n
f
o
r
o
p
t
ica
l
m
u
lt
i
p
a
th
d
isp
e
rsio
n
re
d
u
c
ti
o
n
,”
IET
E
T
e
c
h
n
ica
l
Rev
iew
,
v
o
l
.
30
,
n
o
.
3
,
p
p
.
2
3
3
-
2
3
9
,
2
0
1
3
.
[1
7
]
Zh
a
n
g
T.
,
G
u
o
S
.
,
C
h
e
n
H.
,
Z
h
o
n
g
F
.
,
&
M
a
C
.
,
“
E
n
h
a
n
c
i
n
g
th
e
b
i
t
e
rro
r
ra
te
o
f
i
n
d
o
o
r
v
isi
b
le
li
g
h
t
c
o
m
m
u
n
ica
ti
o
n
sy
ste
m
s u
sin
g
a
d
a
p
ti
v
e
c
h
a
n
n
e
l
e
stim
a
ti
o
n
a
lg
o
rit
h
m
,”
IET
C
o
mm
u
n
ica
ti
o
n
s
,
v
o
l.
9
,
n
o
.
4
,
p
p
.
5
0
1
-
507
,
2
0
1
5
.
[1
8
]
Ra
h
m
a
n
M
.
S
.
,
&
Kim
K.
,
“
In
d
o
o
r
P
o
si
ti
o
n
in
g
b
y
Le
d
Visi
b
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,”
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A.
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A.,
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C
h
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To
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C.
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l
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D.
,
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p
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se
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Li
g
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Co
m
m
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Un
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Ve
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s
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t.
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[2
1
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l
b
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n
J.,
&
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iel
D.
V.
,
“
Un
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Wi
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[2
2
]
Ti
a
n
B.
,
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h
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g
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.
,
&
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X.
,
“
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sig
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ter
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[2
3
]
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s
A.
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,
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d
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ra
A.,
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d
ri
a
n
M
.
R.
,
“
Bid
irec
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rwa
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[2
4
]
Kristian
a
L.
,
Da
rli
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A.
R.
,
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wi
I.
,
“
A.
Th
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sib
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(VLC
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ter
n
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ti
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o
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[2
5
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M
a
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s L
.
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ires
L
.
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.
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ieira
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.
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.
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.
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ira M
.
A
.
M
.
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c
if
J
.
A.
,
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tern
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t
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:
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m
p
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c
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to
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ste
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s
,”
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ter
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e
t
T
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y
L
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tt
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rs
,
p
p
.
1
-
6,
2
0
1
9
.
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