8-1
8-2
Chapter 8
ArS~IIt’II(~
11-.4f+~e
{fio
fr.
L”r/e
S’I.JsG~b-eY”J
~ave.,
VF
~e’rVt~
t>ver-
th~
J>$L
(ales}
Av
welt C(J
IIF
S’crV/~
10
.7’~
Ret’erring
to
Section
3-.9,
it
is
recalled
that
one
twisted–palr
line
“”‘i
th
1’~
1
ror.1
will
transport
data
for
24 ‘IF
conversations
in
one
direction
(transmit
or
receive),
Thus,
two
twisted
pait~
lines
will
support
24
~lub$crlb(‘\rs
in
both
tnlnsmit
find
326
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
L,,”‘lQ
Tx
C.e».+
…
~r
t>ffi
ie
8-3
I
(a.)
.AY\~I’t
S”wih.h
l’/-f}””,lb<L
/.i~~
~,t~,
0-
8-4
When
a
conference-call
connection
is
configured
on
a
digital
switch,
the
data
from
memory
is
just
replicated
on
mUltiple
outputs
so
all
parties
will
hear
the
same
audio.
When a
conference-call
connection
is
configured
on
an
analog
switch
the
analog
circuits
for
the
parties
are
connected
in
parallel.
327
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
8-5
~l.
(£LE)
T”
~
~
~ybl-“d
f1H~\”~
~1ep!Jlt\t..
LI’l1-t.
OV’
A1oc;{~~
Suppose
the
serial
data
port
on
a
PC
is
interfaced
to
the
A
hybrid
(4
wire
to
2
wire)
circuit
could
be
used
to
couple
the
Tx
and
Rx
line-code
signals
to
a
single
twisted-pair
VF
telephone
line.
However,
the
spectrum
of
the
polar
line-code
is
not
compatible
with
the
frequency
response
of
the
VF
telephone
8-6
RlV
()(c.lffld
~
(Jl.f.t~erJ)
(.~)
=-
Lf32.J/1
IJ
J
318
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
I 1
8-7
(P~oIt3~:::
(tl
(D
r(
I~)
;:.
ItJJ8111
~
((;.~8::’
10
lOr
(~).t)
‘=-
/lJ
Itrt(;{~)~)::’
31.
‘I
‘fA
“””–8-.8-\
Er::
!J
Mlh
::.
J..
(6F
+
13)
~
1.
(~F
-f
2
t{-f)
k
;I-f)
.:::}
AF:-
1.1(,
Ii~
1″””–8-.9-1
?TI<::
0.1
IV,
£::
2.
bt-l}J
3.
2
cff/J”~”J-
(q.)
G,q~
7~
–
1.D1T(~1.
~
JhJ./Lf
:::
l.S·~ol$
A’;.
IIi’-J
,\
=
ell’
~~
<f
t
Wb’j.
(3f,.]..f)
-:.
t@
D~
(~
10
Ib
(J
i3Yi(b~L:
–
5″
‘f.1
ulBIu
J
::
4/A8~
r-
Il>-.J
/
::L
-8-.1-0-1
See
MATLAB
S’C)f~tion.
8-11
I See
MA’1’l
A13
sD/who”.
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
8-18
i Lei
-lite
d~iR
6e
~
stlll,l
reriJroJ?:
r
f
– – – 1
Si){
,.
t(., I
,-
I
–
.-
J).(!.J/I
ve
-;
I
t – – –
I L
oc..
d
-,
I
# :
~[:
t~:
::
f~L:
1 1
‘-
1 L J
Ev
tt.lL<d..1-e,
-fhf?J
aVQ.;/oJ,l
e
/,OJAler
/’rl>-,
f4e..
JPttrce.
1-
331
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
1
8–
19
I
Path
_
$.(~i7e)~U
_
7i,+Te
(el.J
V~
~~~’
–
JL(~”‘~)~A
–7L
7-T
e
332
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
I
8-20
I
e
\
“=
\=
=-
G-
4
kT~{S
+
Na..
,
~\v&G-~
thJ,\,
<;.
r-~
l f
0tJ
U
1″tA.
1\
”
…….
t
333
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
[8-21
I
(cA.)
r =
T:,
(F-f)
ttt
I~
:=.
2’1
0
(1
0‘
_I)
–
/2″/”/<
I
8-22
I
(a.)
.IF
g,u.J
::
S r
H~
(6,)
/.~)
=
/0
-/~
VJ
==
S
cJ
c)
0
(N
IN
2.
(2.
X
,’;-lI)
snit:
ID
=-
) ( d
I)
334-
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
[8-23
I
J=r~l-\.1
TC\61~
I-I
~r
FS
K
‘WI
n,~(()~~r(,.t
Jtt~6~r;1
fl~
=
~
e-
t:
(£.L/Mit.l)
8-24
335
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
I
8-25
]
(e
–1
C)
F:=.
J;
+h – I
~(
+.
F;
– (
~\
G-QL
8-26
I (q.)
Or
~
-),
is-
d
IS
~7..
::
20
dIS
~
F~
:=
(Cod
~
~
( ,
F.
~
~
,s-
d
~
“.
FL
=
sJt&
I
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
8-28
COl’i¥J,
(C.)
(;’:z..:
–
3.
’15’
dB
–.
I
8-28
~
LNA
11——-+>[
.DC
~
11
F l>
(;.(“°
~fOJB
=
JD~
~
==
‘dO::3·’!8f
&-a:
:::.
foDJ8:./D(,
~
1
QL
J
T
.::
~5
·K
1i
=8cf8=6.31
1):/lfd8;’2S.1I1
eI
[8-29
I l’E
1P.f
‘:. l:i.
ScAR\,!
“)
Bd{
Jt>
Iblj
~(,Y.ltl’)
::.
?
50S
~
L
::
llJ
ItA..
(~’lTc.t)
~
2()
I\)~
(,/1[
(l’!;!f)()”,jksJ
l~l$DfjJ~
I
FJ
q r
~
3></1,6
…
.&-,
j
c;:../?J)”l_.B
_
I
8-30
I / ILI
7e].::
~()DX.
1)
t~
~”‘\~\\T
;::
lJB
~
+
1″
t;
.:
1ol.B
11::
J
Jill
t?:::
IJ
t
Dr
I~~)~~
SJ~
~
~
-3h~\T
Te~
1t>(F,
“I)
~
1()
(LJ
-Q
(a) Compute
the
system
noise
temperature
Ts
evaluated
at
the
antenna
input
of
the
waveguide:
Ta
:=
160
K
To
:=
290
K
Te2
:=
800
K
0.2
12
6
L1
:=
10
G
:=
10
B
:=
10
Hz
Te
:=
To’
(Ll
–
1)
+
Te2
L1
Ts
:=
Ta
+
Te
Ts
=
1597.534
K
338
I
8·31
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
8 –
31
C
‘,1
–
~,(8
–
tl-3)
d\A.
\
(Cl,)
?t:lt/-l::
In.
·
GAT
(~t~P)J£N::
(l>,t)JJw
+(G-A-T)dl.
I(
:: Id
lcJ’\
f{.~g)(IO-n)
==
–
LL~I(,
dl
d&
J’O
\’
339
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
~
LNA
b-At
Te.
~
r
Zoo
(;-UJt1
~
5c
dB
3lf-O
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II
a
-3\
(b0
COA”\
‘d
\
:=
~
:=
5.
Co,
I~
“‘”
Jl1
I
8-32
I
A£’sv..,v.A~
if
G-~h
dd<.o.AA
\\~\::
&M.-
_
lO
4-
=-
Lf-TJI’l
[
71′”(15)1
==
/,
~c,
X
104
1
T.,.-\
‘>
~
S-
(
‘:>)(
IX)l
Ie)
“\)
2…
I
8-33
I ¢=
‘),~.
8·
N
hf,’ftAd~
)
~:::.l;
‘1~3
.n./ltllq
INSTRUCTOR SOLUTIONS MANUAL
(United States Edition)
Digital & Analog Comm. Systems
8th Edition, L. W. Couch, II