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TCOM 551/EC Lecture number 1 1
TCOM 551DIGITAL COMM!ICATIO!S
S"#I!G 2005
I! 136 $e%ne&%'(& 4)30 * +)10 p,m,
Dr, -erem( A..nutt '..nuttgmu,e%u
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TCOM 551/EC Lecture number 1 2
Gener'. Inrm'tin 1
Cnt'ct Inrm'tin*#m) Science Tecn.g( II7 #m 268
*Te.epne 9+03: 8833868*Em'i.)[email protected]
*Oice M'n'ger) TBD
Oice ;ur&*Mn%'(& 'n% Tue&%'(& 3)00 * 6)00 p,m,
".e'&e7 b( appointmentn.(
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TCOM 551/EC Lecture number 1 3
Gener'. Inrm'tin 2
Cur&e Out.ine*G t http://telecom.gmu.edu'n% c.ic< ncourse
schedule
*Scr.. %=n t TCOM 551
Bad weather days) c'.. 9+03: 8831000
>uMUST;'?e Te @..=ing*'tem'n TeBtb
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TCOM 551/EC Lecture number 1 4
Gener'. Inrm'tin 3
;me=r< A&&ignment&
* @ee. ree t =r< tgeter n te&e7BUT
* A.. &ubmitte% =r< mu&t be (ur =n =ru m'( u&e 'n( 'n% '.. re&urce&7BUT* >u mu&t 'c
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TCOM 551/EC Lecture number 1 5
Gener'. Inrm'tin 4
EB'm 'n% ;me=r< An&=er&
*@r prb.em& &et7 m&t m'r
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TCOM 551/EC Lecture number 1 6
Gener'. Inrm'tin 5
Term "'per*An( tpic in ie.% Digit'. Cmmunic'tin&
*Abut 10 p'ge& .ng 'but 4 igure&*C'n =r< '.ne r in &m'.. grup& 9.engt p'per gr=& =it number in grup * =itpermi&&in n.(:
*Paper marks depend on delivery datesee slide !"
"&&ib.e Tpic&F
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TCOM 551/EC Lecture number 1 +
Gener'. Inrm'tin 6
EB'mp.e& Term "'per Tpic&
* TDMA ?&, CDMA in ?'riu& &itu'tin&
* LDCEL") ='t i& it 'n% = %e& it e.pF* M"EG2) ='t i& it 'n% = %e& it e.pF
* Digit'. Im'ging 'n% it& imp'ct n &prt& c'&ting
* DS) =( %i% %igit'. &uccee% =ere 'n'.g 'i.e%
* $'t i& ' &m'rt 'ntenn' 'n% = =i.. it e.pF
* $
* .uett ?&, IEEE 02,11 Etc.!!!
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TCOM 551/EC Lecture number 1
Gener'. Inrm'tin +
C.'&& Gr'%e&
Emp'&i& i& n ?er'.. ert 'n% re&u.t&
'.'nce bet=een me=r
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TCOM 551/EC Lecture number 1 8
Term "'per Gr'%e "ercent'ge
A m'r< =i.. be '..c'te% t='r%& te gr'%e
'& ..=&)
*"rir t 'n% n Apri. 6t)
#$%
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*!?, 1+ttrug Apri. 20t) '%
*!?, 24ttrug M'( 2+t)
(%
*Ater Apri. 2+t) $%
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TCOM 551/EC Lecture number 1 10
TCOM 551 Cur&e ".'n
G t http://telecom.gmu.edu7c.ic< n
course schedule7 &cr.. %=n t TCOM 551
InC.'&& Te&t& &ce%u.e% r
M'rc 2n%
Apri. 13t
InC.'&& @in'. eB'm &ce%u.e% r
M'( 11t
http://ece.gmu.edu/coursepages.htm)nother
alternative
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TCOM 551/EC Lecture number 1 11
TCOM 551 Lecture 1 Out.ine
Sine $'?e #e?ie=
@reuenc(7 "'&e7 $'?e.engt
Lg'ritm& 'n% % 9%ecibe.: nt'tin
Cre Cncept& Digit'. Cmmunic'tin&
*Surce in,7 C'rrier Sign'.7 M%u.'tin
*C/!7 S/!7 'n% E#
*"errm'nce A?'i.'bi.it(
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TCOM 551/EC Lecture number 1 12
Sine $'?e #e?ie= 1
$e '..
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TCOM 551/EC Lecture number 1 13
Sine $'?e #e?ie= 2
A
'
$'t 'ppen& i =e &ine
' .igt rm te .et 'n%prect te &'%=
nt ' &creenF
"int P
Line n=
%e&cribe& ' circ.e
'but "int "
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TCOM 551/EC Lecture number 1 14
Sine $'?e #e?ie= 3
Ligt
rm
te .etScreen n
te rigt
A
En% JK
precte%
nt te&creen'
"int P
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TCOM 551/EC Lecture number 1 15
Sine $'?e #e?ie= 4
En% JK
precte%
nt te&creen
Screen n
te rigt
A& .ine JK rt'te& 'but
te center pint7 "7 te
precte% en% JK
&ci..'te& up 'n% %=n nte &creen, $'t 'ppen&
i =e m?e te &creen t
te rigt 'n% remember
=ere te precte% en% JK ='&F
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TCOM 551/EC Lecture number 1 16
Sine $'?e #e?ie= 5
Screen
"&itin 1
Screen
"&itin 2
Lcu& JK
en%pint
One &ci..'tin
One ='?e.engt7
$e '?e ' Sine $'?eN
',
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TCOM 551/EC Lecture number 1 1+
Sine $'?e #e?ie= 5
0 80 10 2+0 360 Degree&
*#
+#
,emember:
Sine $ - $ Sine !$ - # Sine #&$ - $ Since 0$ - +# Sine ('$ - Sine $ - $
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TCOM 551/EC Lecture number 1 1
Sine 'n% C&ine $'?e& 1
Sine
1ave
2osine
1ave
0 80 10 2+0 0 360 80 10
Sine $'?e C&ine $'?e shiftedb( 80
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TCOM 551/EC Lecture number 1 18
Sine 'n% C&ine $'?e& 2
Sine 'n% C&ine
='?e& c'n
terere becn&i%ere% t be
't rigt 'ng.e&7
i,e, rtgn'.7t e'c ter
JC&ine
$'?eK
Sine $'?e
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TCOM 551/EC Lecture number 1 20
Sine 'n% C&ine $'?e& 3
A #'%i Sign'. cn&i&t& 'n inp'&e cmpnent
'n% 'n utp'&e 9rtgn'.: cmpnent
Sign'.7S7 i& ten =ritten in te generic rm
S = A cos + j B sin
Inp'&e
cmpnent
Ortgn'.
cmpnent
1here j- +# "
#e'. Im'gin'r(
$e =i.. n.(
cn&i%erReal&ign'.&
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TCOM 551/EC Lecture number 1 21
Sine 'n% C&ine $'?e& 4
T= cncept&
*Te &ign'. m'( be tugt '& ' time ?'r(ing
?.t'ge7 9t:*Te 'ng.e7 7 i& m'%e up ' time ?'r(ing
cmpnent7 t7 'n% ' &upp.ement'r( ?'.ue7 7
=ic m'( be iBe% r ?'r(ing
Tu& =e '?e ' &ign'.
9t: Ac& 9 t :
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TCOM 551/EC Lecture number 1 22
Sine 'n% C&ine $'?e& 5
Time ?'r(ing &ign'.
9t: Ac& 9 t :
In&t'nt'neu&
?'.ue te&ign'.
"'&e) "MP "S
@reuenc() @MP @SAmp.itu%e) AMP AS
'r( te&e
tModulate
te &ign'.
!te) 2 f
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TCOM 551/EC Lecture number 1 23
'c< t ur Sine $'?e * 1
Deining te $'?e.engt
Te ='?e.engt
i& u&u'..(
%eine% 't te
JQer cr&&ing&K
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TCOM 551/EC Lecture number 1 24
'c< t ur Sine $'?e 2
One re?.utin 360
One re?.utin '.&
cmp.ete& ne c(c.e 9r
='?e.engt: te ='?e,
S te JphaseK te ='?e
'& m?e% rm 0t 360
9i,e, b'c< t 0: in ne c(c.e,
Te '&ter te p'&e c'nge&7
te &rter te time ne c(c.e
9ne ='?e.engt: t'
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TCOM 551/EC Lecture number 1 25
'c< t ur Sine $'?e * 3
T= u&eu. eu'tin&
"'&e '& c'nge% b(
Te r'tec'nge te p'&e7
ddt7 i& te reuenc(7f,
Te time t'
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TCOM 551/EC Lecture number 1 26
Sine $'?e * 4
$'t % =e me'n J#'tec'nge p'&e
i& reuenc(KF
3ne revolution - ('$o-
radians
3ne revolution - # cycle
3ne revolution/s - # cycle/s - # 45
67amples:#. 0$o/s - revolutions/s - 45
. #&8$$$o/s - #&8$$$/('$ revs/s
- 9$ revs/s - 9$ 45
Beore we look at d
dtlets look at rate+o+change o phase
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TCOM 551/EC Lecture number 1 2+
ddt Digre&&in 1
"ilomete#s
0 1 2 3 4 5 6 + 8
Time hou#s
16
12
4
0
"er&n ='.
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TCOM 551/EC Lecture number 1 2
ddt Digre&&in 2
"ilomete#s
0 1 2 3 4 5 6 + 8
Time hou#s
16
12
4
0
>u c'n cmpute te
A&e#a'e $elocit%
u&ing %i&t'nce/time7
9i,e, 16/ 2
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TCOM 551/EC Lecture number 1 28
ddt Digre&&in 3
"ilomete#s
0 1 2 3 4 5 6 + 8
Time hou#s
16
12
4
0
)
B
T diffe#entiate
me'n& t in% te
&.pe 't 'n( in&t'nt,
Te &.pe ' cur?e
i& gi?en b( tet'ngent 't t't pint7
i,e,7 A/
In ti& c'&e7 A i& in
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TCOM 551/EC Lecture number 1 30
ddt Digre&&in 4
$en =e diffe#entiate7 =e 're t'
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TCOM 551/EC Lecture number 1 31
Sine $'?e Cntinue%
C'n tin< ' Sine $'?e '& ' *a##ie# Si'nal
i,e, te &ign'. nt =ic te inrm'tin i&
.'%e% r &en%ing t te en% u&er
A C'rrier Sign'. i& u&e% '& te b'&i& r &en%ing
e.ectrm'gnetic &ign'.& bet=een ' t#ansmitte#
'n% ' #ecei&e#7 in%epen%ent.( te reuenc(
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TCOM 551/EC Lecture number 1 32
C'rrier &ign'.& 1
A C'rrier Sign'. m'( be cn&i%ere% t
tr'?e. 't te &pee% .igt7 c7 =eter it i&
in ree &p'ce r in ' met'. =ire Tr'?e.& mre &.=.( in m&t &ub&t'nce&
Te ?e.cit(7 reuenc(7 'n% ='?e.engt
te c'rrier &ign'. 're uniue.( cnnecte% b(
c = f $'?e.engt
@reuenc(e.cit( .igt
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TCOM 551/EC Lecture number 1 33
C'rrier &ign'.& 2
EB'mp.e
*$AM 9!'tin'. "ub.ic #'%i: tr'n&mit& 't '
c'rrier reuenc( ,5 M;Q*$'t i& te ='?e.engt te c'rrier &ign'.F
An&=er
*c 93R10G: m/& f R 9,5 106: R 9 :
*$ic gi?e& 3,38 m 3,4 m#emember) M'
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TCOM 551/EC Lecture number 1 34
Digre&&in U,TS
St'n%'r% unit& t u&e 'reM-S*M meter& =ritten '& m
*-
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TCOM 551/EC Lecture number 1 35
C'rrier &ign'.& 3
A *a##ie# Si'nalc'n*c'rr( u&t ne c'nne. inrm'tin 9ti& i& ten
c'..e% Sing.e C'nne. "er C'rrier S**:*Or c'rr( m'n( c'nne.& inrm'tin 't te &'me
time7 u&u'..( trug 'Multiple/e#
TBSing.e
C'nne.S**
Mu.tip.eBer TBMu.tic'nne.
c'rrier
Multiple/ed
*a##ie#
!te) Te m%u.'tr
'& been mitte% inte&e %r'=ing&
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TCOM 551/EC Lecture number 1 36
Lg'ritm& 1
Te u&e .g'ritm& c'me 'but r t=
b'&ic re'&n&)
*A nee% t mu.tip.( 'n% %i?i%e ?er( .'rge number&
*A nee% t %e&cribe &peciic prce&&e& 9e,g, in
Inrm'tin Ter(: t't cunte% in %ierent
0ases !umber& 're t te b'&e 10P i,e, =e cunt in
mu.tip.e& ten&
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TCOM 551/EC Lecture number 1 3+
Lg'ritm& 2
17 27 37 47 57 67 +7 7 87 10T be e'&ier t &ee7 ti& &u.% be=ritten '& te &erie&
007 017 027 037 047 057 , 087 10
117 127 137 147 15 ,,
,,
817 7 8+7 87 887 100
8817 ,,7 88+7 887 8887 1000
$e 'ctu'..( cunt
rm 1 t 10 but
te numberingge& rm 0 t 87
ten =e c'nge
te ir&t %igit 'n%g rm 0 t 8
'g'in7 'n% & n
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TCOM 551/EC Lecture number 1 3
Lg'ritm& 3
Cunting t b'&e 10 i& teDecimal S%stem
$e cu.% eu'..( =e.. cunt in '
Duodecimal S%stem7 =ic i& ' b'&e 127 'He/adecimal S%stem7 =ic i& ' b'&e 167 '
Bina#% S%stem7 =ic i& ' b'&e 27 etc,
Stic
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TCOM 551/EC Lecture number 1 38
Lg'ritm& * 4A
A Decim'. S(&tem c'n be =ritten '& '
p=er 107 r eB'mp.e
*100 1
*101 10
*102 100
*103 17000*104 107000
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TCOM 551/EC Lecture number 1 40
Lg'ritm& * 4
A Decim'. S(&tem c'n be =ritten '& '
p=er 107 r eB'mp.e
*100 1
*101 10
*102 100
*103 17000*104 107000
D (u %etect 'n( .gic ereF
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TCOM 551/EC Lecture number 1 41
Lg'ritm& * 4C
A Decim'. S(&tem c'n be =ritten '& '
p=er 107 r eB'mp.e
*100 1
*101 10
*102 100
*103 17000*104 107000
Te number Qere& i& te
&'me '& te ?'.ue teeBpnent
D (u %etect 'n( .gic ereF
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TCOM 551/EC Lecture number 1 42
Lg'ritm& 5
Let& .< 't te&e 'g'in
*100 1
*101 10
*102 100
*103 17000*104 107000
Te eBpnent i& c'..e% te.g'ritm te number
T't i&)
Te .g'ritm 1 0Te .g'ritm 10 1
Te .g'ritm 100 27 etc,
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TCOM 551/EC Lecture number 1 43
Lg'ritm& 6
ue&tin)
*Te .g'ritm 1 t te b'&e 10 9=ritten '&
.g101: 0 'n% .g1010 1, $'t i I ='nt te
.g'ritm ' number bet=een 1 'n% 10F
An&=er)
*>u
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TCOM 551/EC Lecture number 1 44
Lg'ritm& +
ue&tin
*$'t i& te .g'ritm 3F
An&=er)*$e ='nt .g103
*Let .g103 /
*Tr'n&p&ing7 =e '?e 10/ 3*An% 100,4++1213 37 gi?ing/ 0,4++1
*Tu& .g103 0,4++1
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TCOM 551/EC Lecture number 1 45
Lg'ritm&
Mre EB'mp.e&
*$'t i& .g104F
*$'t i& .g10+F
*$'t i& .g10+,654F
*$'t i& .g1024F
*$'t i& .g104123,6F
*$'t i& .g100,68F
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TCOM 551/EC Lecture number 1 46
Lg'ritm& 8
Mre EB'mp.e& 9An&=er&:
*$'t i& .g104F 0,6021
*$'t i& .g10+F 0,451
*$'t i& .g10+,654F 0,38
*$'t i& .g1024F 1,302
*$'t i& .g104123,6F 3,6153
*$'t i& .g100,68F 0,1612
0,68 i& U 1 & te 'n&=er mu&t be be.= 0
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TCOM 551/EC Lecture number 1 4+
Lg'ritm& 10
ue&tin
*$'t i I ='nt t '?e ' .g'ritm te ?'.ue
JBK =it ' %ierent b'&eF An&=er
*Let& '&&ume (u ='nt t '?e .ga/7 i,e, te
b'&e i& J'K 'n% nt 10*Ten .ga/ 9.g10/: / 9.g10':
EB'mp.e
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TCOM 551/EC Lecture number 1 4
Lg'ritm& 11
ue&tin
*$'t i& .g/10F
9i,e, b'&e J'K 2 'n% te number/10:
An&=er
*Since .g'/ 9.g10/: / 9.g10':*Lg/10 9.g1010: / 9.g102: 1/0,301
3,3218
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TCOM 551/EC Lecture number 1 48
Lg'ritm& 12
Let& .< 't ti& 'nter ='()
*Lg2 10 3,3218
#emember7 i .g'9number: /7 =e c'ntr'n&p&e ti& t '/ 9number:
Tu&7 'nter ='( .
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TCOM 551/EC Lecture number 1 50
Lg'ritm& 13
20 1 .g21 0
21 2 .g22 1
22 4 .g24 2
23 .g2 3
24 16 .g216 4
25 32 .g232 5
26 64 .g264 6
Ti& i& te
Bina#%
S%stem
Lg2i&
un%'ment'. t
=normation
>heory
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TCOM 551/EC Lecture number 1 51
Lg'ritm& 14
!te (u c'n g r='r%& 9.g'ritm: 'n%b'c
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TCOM 551/EC Lecture number 1 52
Lg'ritm& 15
St'n%'r% nt'tin&
*A .g109number: i& nrm'..( =ritten '& .g
9number: i,e, .e'?e te 10P e,g, .g 10 1*A .g'ritm t't u&e& te eBpnenti'. ?'.ue7 e7
'& ' b'&e7 reerre% t '& ' Jn'tur'.K .g'ritm7 i&
=ritten '& .ge9number:7 r .n 9number:
*A.. ter b'&e& mu&t be inc.u%e% i te( 're nt
10 r eP e,g, .g29number:
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TCOM 551/EC Lecture number 1 53
Lg'ritm& 16
S = % .g'ritm& e.p u&F
An&=er) b( cn?erting t .g'ritm&
*In&te'% mu.tip.(ing (u c'n add
*In&te'% %i?i%ing (u c'n su0t#act
*VTe( 're '.& 'n interme%i'te &tep 9&ee .'ter:W
;= i& t't p&&ib.eF
*See eB'mp.e n te neBt &.i%e
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TCOM 551/EC Lecture number 1 54
Lg'ritm& 1+
EB'mp.e
*100 17000 10/10( 109
*28+ 4+35 102,4+2G103,6+53 106,14G1
174067284,88
*3+8 183 103,580+102,2G56 101,3051
20,181+ ig De'.N M( c'.cu.'tr c'n % t't &tu in
Qer &ecn%& .'tN
2 3 5
S) re'% nN
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TCOM 551/EC Lecture number 1 55
Lg'ritm& 1
$'t i te number& 're #eall%.'rge r
re'..( &m'..F
EB'mp.e&*9173+,465 1014: 983 108:
*91,3 1023: 9107 38+: 923:
ut .g'ritm& 're re'..( 'n interme%i'te
&tep t deci0els9=ritten '& %:
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TCOM 551/EC Lecture number 1 56
Decibe. 9%: !t'tin 1
;i&tric'..( teBel7 n'me% 'ter A.eB'n%er
Gr''m e..7 i& ' unit &un%
It ='& %e?e.pe% '& ' r'ti me'&ure) i,e,7 itcmp're& te ?'riu& &un% .e?e.&
TeBel='& un% t be t .'rge ' ?'.ue 'n% & '
tent 'Bel='& u&e%7 i,e,7 te deci0el
A deci0elr 1 %7 ='& un% t be te minimum
c'nge in &un% .e?e. ' um'n e'r cu.% %etect
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TCOM 551/EC Lecture number 1 5+
Decibe. 9%: !t'tin 1
ue&tin*;= % (u get ' % ?'.ueF
An&=er
*T'6: Never ?uote a dB number to more
than one place o decimals
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TCOM 551/EC Lecture number 1 5
Decibe. 9%: !t'tin 2
Sme ting& t remember
*A % ?'.ue i& '.='(& 10 .g10P it i& ne&e# e&e#
20 .g10 7 =e?er ,,*10 .g109/:a 10 a.g109/:
e,g, 10 .g109/:2 10 2 .g109/: 20 .g 109/:
*Te % r'ti m'( be reerence% t ' gi?en.e?e.7 r eB'mp.e
1 $ 9unit =u.% be %$:
1 m$ 9unit =u.% be %m:Some e7amples
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TCOM 551/EC Lecture number 1 58
Decibe. 9%: !t'tin 3
ue&tin* An 'mp.iier incre'&e& p=er b( ' r'ti 1+)17 ='t i&
te % g'inF
An&=er* 10 .g101+ 12,3 %
ue&tin* Te 'mp.iier i& e% =it 1$7 = m'n( ='tt& 're utputF
An&=er* 1+ $'tt& =ic i& eui?'.ent t 12,3 %$
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TCOM 551/EC Lecture number 1 60
Decibe. 9%: !t'tin 4
EB'mp.e& % nt'tin& p=er7 etc,
*425 $ 26,3 %$
*425 $ 4257000 m$ 56,3 %m*0,3 $ 5,2 %$
*0,3$ 300 m$ 24, %m
*247500 43,8 %*2+3 E##o#* (u c'nnt t'
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TCOM 551/EC Lecture number 1 61
Cre Cncept& Digit'.
Cmmunic'tin& 1
Di&t'nce
@reuenc(
Surce enc%ing
SurceP
M%u.'tin
Mu.tip.eBing
#@
t
I@
Amp.iic'tin
'n% tr'n&mi&&in
#eceptin 'n%
'mp.iic'tin
C'nne. c%ing
#@
t
I@
Dem%u.'tin
C'nne. %ec%ing
Demu.tip.eBing
Sin
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TCOM 551/EC Lecture number 1 62
Cre Cncept& Digit'.
Cmmunic'tin& 2
Di&t'nce
@reuenc(
Surce enc%ing
SurceP
M%u.'tin
Mu.tip.eBing
#@
t
I@
Amp.iic'tin
'n% tr'n&mi&&in
#eceptin 'n%
'mp.iic'tin
C'nne. c%ing
#@
t
I@
Dem%u.'tin
C'nne. %ec%ing
Demu.tip.eBing
Sin
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TCOM 551/EC Lecture number 1 63
e( De&ign I&&ue& 1
S/!* Sign'.t!i&e #'ti 9An'.g:
!ee% t be 'b?e u&er& tre&.% r #euire% S
C/!* C'rriert!i&e #'ti 9An'.g 'n% Digit'.:
!ee% t be 'b?e %em%u.'tin tre&.%r u&eu. tr'n&er inrm'tin
E#* it Errr #'te 9Smetime& it Errr #'ti: S/!
!ee% t &'ti&( te "errm'nce 'n% A?'i.'bi.it(Speciic'tin&
$e =i..
.< 't
e'c
te&e
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TCOM 551/EC Lecture number 1 64
Sign'.t!i&e #'ti 1
Sign'.t!i&e7 =ritten '& S/!7 i& m'in.(
u&e% r An'.g S(&tem&
S/! i& &peciie% 't te'&eb'n% te Inrm'tin C'nne.
'&eb'n% i& '
r'nge
reuencie&
c.&e t Qer
Inrm'tin i& ='t i& &ent
t te u&er 'n% te c'nne.
?er =ic it i& &ent i& te
Inrm'tin C'nne.
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TCOM 551/EC Lecture number 1 65
Sign'.t!i&e #'ti 2
$'t S/! ?'.ue gi?e& ' g% receptinF
*Te.epne 'n% T c'nne.& reuire ' minimum
50 %
An'.g &ign'.& '?e Jgr'ceu. %egr'%'tinK
c'r'cteri&tic&
50 % r'ti 1007000
IE:teSi'nalp=er i& 1007000 X teoisep=er
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TCOM 551/EC Lecture number 1 66
Sign'.t!i&e #'ti 3
An'.g #eceptinS/!Le?e.
G%
M'rgin'.
'%
100 0 60 40 20 0
"ercent'ge Time 'b?e Tre&.%
A
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TCOM 551/EC Lecture number 1 6+
Sign'.t!i&e #'ti 4
Te S/! i& ='t te u&er percei?e&7 but it i&
u&u'..( me'&ure% 't te demodulato#utput
Te C/! 't te demodulato#input =i..
%etermine te utput S/!
Dem%u.'tr#ecei?e%
&ign'.
&er&
App.ic'tin
De?ice
Output
S/!
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TCOM 551/EC Lecture number 1 6
C'rriert!i&e #'ti 1
C'rriert!i&e7 =ritten '& C/!7 i& u&e% r bt
An'.g 'n% Digit'. S(&tem&
Te C'rrier &ign'. '& info#mationrm te&en%er impre&&e% upn it7 trug modulation.
Te c'rrier7 p.u& te m%u.'te% inrm'tin7 =i..
p'&& trug te =i%eb'n% prtin tr'n&mitter'n% recei?er7 'n% '.& ?er te tr'n&mi&&in p't
222
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TCOM 551/EC Lecture number 1 68
C'rriert!i&e #'ti 2
Inrm'tin
t be &ent M%u.'tr
MiBer MiBer
Tr'n&mitter #ecei?er
Inrm'tin
recei?e%Dem%u.'tr
$i%eb'n% 9p'&&b'n%: &ign'. =it m%u.'tin
'&eb'n% &ign'. =it r'= inrm'tin
I@ I@
#@ #@
Te C/! 't te
input t te
%em%u.'tr i&
te
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TCOM 551/EC Lecture number 1 +0
C'rriert!i&e #'ti 3
Dem%u.'trInput
C/!
&eu. utputF
C/!
12
10
6
42
0
Cn&er?'ti?e %e&ign Le?e.
910 %: =it n c%ing2an use these
2/N levels with
2oding8 etc.
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TCOM 551/EC Lecture number 1 +1
C'rriert!i&e #'ti 4
&eu. %e&ign reerence r unc%e% "SE# 1036't 10,6 % input C/! t Dem%u.'tr
E#
103
104
105
106
10+
10
0 10 20 30 C/!
#$.' dB
E# ice M'Bimum
E# D't' M'Bimum
oal is
#$+#$
BER2
7/23/2019 TCOM551-Lecture1.ppt
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TCOM 551/EC Lecture number 1 +2
E# 1
E# me'n&Bit E##o# Rate7 =e?er &me
pep.e reer t it '& teBit E##o# Ratio9i,e,
te r'ti b'% t g% bit&: Strict.( &pe'
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TCOM 551/EC Lecture number 1 +3
E# 2
A E# 106me'n& n te r%er neerrr in ' p'ge ' @AY me&&'ge
T impr?e E#7 c'nne. c%ing i& u&e%*@EC c%e&
*Inter.e'?e% c%e&
Cmmunic'tin& &(&tem& 're &peciie% inm'n( ='(&7 but te t= m&t cmmn 'repe#fo#mance'n% a&aila0ilit%
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TCOM 551/EC Lecture number 1 +4
E# 3
"errm'nce
*Gener'..( &peciie% '& ' E# t be m'int'ine%
r ' ?er( ig percent'ge te time 9u&u'..(
&et bet=een 8H 'n% 88H te time:
A?'i.'bi.it(
*Gener'..( &peciie% '& ' minimum E# be.==ic n inrm'tin c'n be tr'n&mitte%
&ucce&&u..( i,e, 'n ut'ge ccur&
Aig. &. in Pratt et al.8
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TCOM 551/EC Lecture number 1 +5
E# 4Satellite 2ommunications
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TCOM 551/EC Lecture number 1 +6
E# 5
$'t c'u&e& te c'nge in E#F
Since E# i& %etermine% b( C/!7 c'nge in
E# i& c'u&e% eiter b(*C'nge& in C 9i,e, c'rrier p=er .e?e.:
Antenn' .&e& tr'c
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TCOM 551/EC Lecture number 1 ++
E# 6
100 10 1 0,1 0,01 0,001
"ercent'ge te Time
20
16
12
4
0
Attenu'tin7
%
88,+H 0,03H ut'ge
i& ' t(pic'. SAT &pec,
88,88H 0,01H ut'ge i& '
t(pic'. ig '?'i.'bi.it( &pec,
88,888H 0,001H ut'ge i& '
t(pic'. &ing.ep &peciic'tin
3 %
6 %
18 %
E# +
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TCOM 551/EC Lecture number 1 +
E# * +
"errm'nce A?'i.'bi.it(
100 10 1 0,1 0,01 0,001
"ercent'ge te Time
1010
10
106
104
102
E#
EBcee%& A?'i.'bi.it( Spec,
EBcee%& "errm'nce Spec,
De& nt meet
"errm'nce r
A?'i.'bi.it( Spec&,
E#
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E# *
"errm'nce A?'i.'bi.it(
100 10 1 0,1 0,01 0,001
"ercent'ge te Time
1010
10
106
104
102
E#
$itut C%ing
$it C%ing
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