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10
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6
Following
the
discussion
leading
up
to
(3-45),
the
PSD
for
Bipolar
NRZ
is:
222
PBNRZ(f)
:=
A Tb’
(Sci(7T
f
Tb»
.
(sin(l1′
f·
Tb»
4e-006
using
(3-45)
the
PSD
for
Bipolar
RZ
is:
PBRZ
(f)
:=
A
2
.
[:b]
[sa
[f
:b]]
2
Tb»
2
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INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
3-31
I
:=
1
A R
:=
1 f : =
0,
O.
05
••
5 1
Tb
:=
–
R
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PSD
for
Unipolar
NRZ
is
given
by
(3-39b)
and
consists
of
both
0.5
\~
PUNRZ
(f)
o a f
5’R
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(3-41)
for
Polar
NRZ
spectrum:
2
PPNRZ
(f)
:=
[A
Tb]
(Sa
(fT
f.
Tb) ) 2
The
PSD
for
Unipolar
RZ
is
given
by
(3-43)
and
consists
of
both
a
continuous
spectrum
and
a
discrete
spectrum.
The
computer
cannot
plot
infinite
values
for
the
delta
functions,
so
plot
the
weights
of
the
delta
functions
instead.
Thus
(3-43)
will
be
broken
into
two
functions,
one
for
the
continuous
spectral
plot
and
one
for
the
98
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
PURZ(f)
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PURZe(f) + PURZd(f)
0.2
0.3
”
PBRZ(f)
Use
(3-46c)
for
the
Manchester
NRZ
spectrum:
0.6
89
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
3-32
Referring
to
(3-36),
it
is
seen
that
this
equation
is
derived
in
Chapter
6
and
that
(3-36)
is
identical
to
(6-70b).
Furthermore,
the
solution
to
this
problem
is
given
in
the
text
following
(6-
3-33
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INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
3-36
A
possible
regenerative
repeater
for
a
Polar
RZ
line
code
would
be
almost
identical
to
the
Unipolar
NRZ
repeater
shown
in
Fig.
3-19
except
that
a
monostable
output
circuit
would
be
required
to
produce
the
penni
t
ted
binary
levels
of
+Vo
and
–
Va
instead
of
+V
o
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INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II