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ce
s
s
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i
n
i
m
izi
n
g
t
h
e
p
r
esen
ce
o
f
n
o
is
e
[
1
5
]
.
A
s
f
o
r
th
e
ad
v
a
n
ta
g
es
o
f
u
s
i
n
g
lig
h
t
as
a
tr
an
s
m
is
s
io
n
m
ed
iu
m
i
s
a
d
ata
s
ec
u
r
it
y
f
ac
to
r
,
L
I
FI
is
p
ar
t
o
f
w
ir
eles
s
co
m
m
u
n
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n
t
h
at
u
s
i
n
g
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tr
o
m
a
g
n
etic
w
a
v
e
f
o
r
tr
an
s
m
is
s
io
n
d
ata,
in
th
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s
ca
s
e,
lifi
ca
n
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e
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s
ed
as
a
s
o
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tio
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ter
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n
d
co
n
g
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o
n
w
h
en
s
e
n
d
in
g
w
ir
ele
s
s
-
b
ased
d
ata
[
1
6
,
1
7
]
.
T
h
e
o
th
er
ad
v
an
ta
g
es
o
f
li
f
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h
ig
h
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p
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o
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tr
a
n
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io
n
,
b
ec
au
s
e
li
f
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e
t
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ig
h
t
s
p
ec
tr
u
m
t
h
at
h
a
s
a
h
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g
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er
f
r
eq
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en
c
y
t
h
an
r
ad
io
w
a
v
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f
o
r
tr
an
s
m
is
s
io
n
o
f
d
at
a
[
1
8
,
1
9
]
.
A
n
o
th
er
ad
v
an
tag
e
ass
o
ciate
d
w
it
h
L
I
FI
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th
e
h
i
g
h
s
p
ee
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d
in
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ata,
s
o
th
is
s
y
s
te
m
s
tr
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l
y
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u
p
p
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ts
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m
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ti
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w
it
h
a
m
ax
i
m
u
m
d
is
tan
ce
o
f
3
m
eter
s
[
5
]
.
Du
e
to
th
e
li
m
ited
tr
an
s
m
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s
s
io
n
d
is
tan
ce
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f
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tr
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ter
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er
,
th
e
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L
C
m
et
h
o
d
is
s
u
itab
le
if
u
s
ed
in
an
in
d
o
o
r
r
o
o
m
[
1
2
]
.
A
s
f
o
r
th
e
in
ter
n
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ta
n
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ar
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g
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m
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h
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h
t
as a
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ter
m
ed
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,
I
E
E
E
8
0
2
.
1
5
.
7
[
2
0
]
.
Fro
m
s
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m
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f
t
h
e
d
escr
ip
tio
n
ab
o
v
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w
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co
m
m
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s
es l
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m
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to
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m
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m
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m
p
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tan
t
in
w
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eles
s
-
b
ased
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m
m
u
n
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co
m
p
ar
ed
to
u
s
in
g
r
ad
io
w
a
v
es.
Fo
r
th
at
w
e
n
ee
d
a
s
y
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te
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t
h
at
h
as
a
g
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ter
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d
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p
la
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g
t
h
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n
d
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ased
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th
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n
u
m
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t
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n
u
m
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its
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s
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d
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r
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tr
asn
m
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s
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ca
n
b
e
av
o
id
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.
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h
er
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o
r
e,
th
is
p
ap
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w
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ll
d
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cu
s
s
t
h
e
p
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c
ess
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n
d
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ata
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w
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th
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io
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e
as it
s
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ter
m
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m
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B
y
u
s
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g
Ar
d
u
in
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Un
o
a
s
m
icr
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p
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ce
s
s
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th
at
r
eq
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ir
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p
u
t
p
o
w
er
o
f
5
v
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lts
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n
d
f
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th
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m
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ito
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p
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tr
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n
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ter
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y
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te
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p
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la
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t
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cc
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ata
tr
an
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m
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s
s
u
s
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n
g
v
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s
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a
l
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t
u
d
io
[
2
1
-
2
3
]
.
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is
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al
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t
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licatio
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late
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th
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ill b
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s
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b
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s
[
2
4
-
2
7
]
.
2.
RE
S
E
ARCH
M
E
T
H
O
D
T
h
e
d
is
ad
v
an
ta
g
e
in
t
h
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p
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ce
s
s
o
f
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en
d
i
n
g
d
ata
u
s
i
n
g
w
ir
eless
m
ed
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is
t
h
e
lo
n
g
er
d
eli
v
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y
ti
m
e
co
m
p
ar
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to
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s
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ca
b
le
m
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ia,
th
er
ef
o
r
e
an
o
th
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m
ed
ia
th
at
ca
n
tr
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s
m
it
d
ata
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n
a
s
h
o
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t
ti
m
e
is
b
ased
o
n
w
ir
ele
s
s
.
T
h
er
ef
o
r
e,
v
is
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le
l
i
g
h
t
co
m
m
u
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(
V
L
C
)
c
an
b
e
a
s
o
lu
tio
n
f
o
r
s
en
d
i
n
g
d
ata.
Vis
ib
le
li
g
h
t
co
m
m
u
n
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n
(
V
L
C
)
is
a
d
ata
co
m
m
u
n
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m
ed
iu
m
t
h
at
u
s
es
v
i
s
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le
lig
h
t
b
et
w
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n
4
0
0
an
d
8
0
0
T
Hz
(
7
8
0
-
3
7
5
n
m
)
[
2
8
]
.
T
h
e
VL
C
m
o
d
u
le
u
s
es
A
r
d
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Un
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Dio
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s
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m
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in
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d
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On
th
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T
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s
m
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tter
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it
w
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2
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P
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n
s
m
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a
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d
r
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m
o
d
u
le
[
2
9
]
.
Ser
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ca
b
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s
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co
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A
r
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