phan tich he thong rof ghep kenh song mang phu su dung may thu coherence

8/17/2019 Phan Tich He Thong Rof Ghep Kenh Song Mang Phu Su Dung May Thu Coherence

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MỤC LỤCCÁC TỪ VIẾT TẮT 4

LỜI NÓI ĐẦU 6CHƯƠNG 1GIỚI THIỆU VỀ KỸ THUẬTTRUYỀN SÓNG VÔ TRUYẾN TRÊN SỢI QUANG 8

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/‹$ $2'( >#b !# %-$ 0i xS '('( Dl'( '!# '@' $$ !" !\'( !k' !\i R $?

!L P‚'( !k' !\i ,' !i"# UTS $E ='( '! ‰' '(i =}i. e ‹'( P'( :!$ ='( $$ !" !\'( =#3 '!-?@+,

T='( $!%&'( '3‡ $!c'( … r/ !iL# w# !+ :+ !- (iJ /0'( 5#'( /0'(

2 #3+' ‹'( > ! =iL' %- D?'( 2 #3+' =@' >-i 5#'( !'! 5#E $F w# !+ '3 >ƒ $' %-$

i+ $ ! =iL' 9 >#. e >\ iL/ '( %# d 9 :; !#


19/87

− Với $$ %# iL/ %- =ei '!% Dt'( !2'( =e'(‡ >#3 ! !b‡ :!2'( E'! !%y'( Dyi

'!iv# i"' †‡ P€$! ‡ Pv #b i@# !‡ !k' Dj i

'(#3@' e'(‡ !" !\'( R >ƒ PC' !3 !+ $$ !" !\'( >p P'( $ :i/ 0i =%ớ$k3.

− Với i"$ =#39' ,' !i"# 5# >-i 5#'(‡ ,'! DE / 5#b3 '!iv# $F $$ !i+ D€ !j !2'( >p P'( >?'( i"' †‡ '!b ='(

!}i 0i / b' 9 DE /p P'( $!c'( '!l/ 'k'( $ !i"# 't'( $F !" !\'(‡ F >‹$

‹'( $$ '!# $C# ='( !i"' 0i %&'( i‡ ới ,'! :!E !i =b $.


20/87

Chương 2: Phương pháp ghép kênh sóng mang phụ

CHƯƠNG 2

PHƯƠNG PHÁP GHjP K8NH ÓNG M$NG PHỤ2;1 G'-?@+,

B!%&'( '3 '!l/ /$ ,$! (iới !i"# 9 /e ='( '!J'( !%&'( ![ (![

:@'! %-$ >p P'( ='( !2'( i' 2 #3+' (![ :@'! >?'( /'( !. Nei P#'(

$!%&'( '3 D (f/ „

~ Giới !i"# 9 !%&'( ! (![ :@'! >?'( /'( !

~ H" !\'( SB ,' !i"# %&'( ~ H" !\'( SB ,' !i"# >\

~ H" !\'( SB >?'( /'(

2;2 G'\ %-'( :@'! !r $? !L :! '!i9#. 0'( BATV /e , P ới

,' !i"# ='( /i9' i"'. N9' E'( $F :; !#p P'( '!i9# >?'( /'( L

=#39' '!i9# :@'! =@' $ f'( =$ !$ ='( :!2'( (i' P. xt'( !2'( :!i

=#39' '!i9# ,' !i"# '!% ?'( /'( !. 3 !3‡ :; !#


21/87


Hr'! ).1 3 ! $F !" !\'( SB ới /e >?'( /'( 5#'(.

Hr'! ).1 /2 !r'! !, /3 ! $F /e !" !\'( SB ='( /0'( 5#'( ới

$!” /e >?'( /'(. Ži #f'( ,' !i"# +' %-$ =e' ới /e C' >\ (i e'( 'ei‡

%-$ (i >?'( /'( !‡ ># ? $!c'( %-$ :+ !- 0i >p P'( $! i"$ i9#

$!+ >?'( /'( 5#'(.

Hr'! ).) 3 !# $F !" !\'( SB ới /e >?'( /'( 5#'(

Hr'! ).) /2 !r'! !, /3 !# $F /e !" !\'( SB ='( /0'( 5#'( ới

/e >?'( /'(. T0i k3‡ ,' !i"# !# %-$ !Ei $!#3L' ji † 5#'( >'( i"'. T,'


22/87


!i"# i"' >ƒ 5# De R >ia= L 0 = N DE' >. T,' !i"# y :@'! ' >ƒ %-$ =e'

ới $!,'! C' >\ >?'( /'( ! $F :@'! ? L !$ !i"' $!' :@'!. T† De =e'‡ ,'

!i"# = !Ei 5# De $ :!#+$! 0i‡ $!” '!J'( !'! !C' ' 'l/ ='( Dt'( !2'($F De $ :!#+$! 0i /ới %-$ (iJ 0i‡ $$ !'! !C' :!$ >ƒ D€ 0i Ds.

# iL/ $!,'! $F !" !\'( SB ,'! j' €'! Pv P'( 'k'( $b ='( $$

‹'( P'( 9 /0'( Dt'( !2'( =e'(. N? $? !L >p P'( $$ !%&'( ! i9# $!+ ,'

!i"# %&'( ‡ i9# $!+ ,' !i"# >\‡ !$ :+ !- $E !i L =#39' f'( !}i (i'( '?i‡

PJ i"# ,' !i"# iPa $! /e >\ %-'( ớ' '(%}i P‚'(. Ži '(%}i P‚'( $? !L

%-$ !$ Dyi /e >?'( /'( !‡ !t$ /e ,' !i"# :@'! >ƒ %-$ ! +' b

$E '(%}i P‚'( '!% \i ới !" !\'( /0'( BATV. H&' !+ 'J‡ Dyi r $$ >?'( /'(

$$ C' >\ !b‡ $$ !'! !C' 3@# $C# \i ới !" !\'( P =@' SB !C# !+

:!E P'(. B$ De i9# $!+‡ $$ De =e' $$ De :!#+$! 0i %-$ >p P'( ='(

BATV !3 $$ !" !\'( " i'! :!$ ‰' $? !L %-$ >p P'( ='( $$ !" !\'( SB‡

P‰' +' (i !'! !" !\'( !b.

N!%-$ iL/ $F SB /e :› !#ƒ '!03 $E/ ji ới

$$ $ e'( '!iv# /[ P $$ !i"# ‹'( !i #3+'. {i9# '3 P‰' ới $$ 3@# $C#

#3+' ,'! '(!i@/ '( ='( !0 e'( $F $$ !'! !C'‡ $ Di" \i ới $$ ‹'(

P'( '!% iPa | $$ ‹'( P'( $? !L i !si ” >\ >?'( /'( =@' 0 k/

BNR œ Px. N!iv# $%}'( e %&'( \i RIN $F >a= ! '(#f' $!,'! $F '!iv#

'@' %-$ (iJ $'( !b $'( \.

Với '!J'( $ iL/ =@'‡ :; !#ƒ r/ !i"# 9 !" !\'( SB ,'

!i"# %&'( ,' !i"# >\‡ \ !%}'( %-$ >p P'( '!i9# ='( !" !\'(

!2'( i' 5#'(. T#3 '!i@'‡ ='( /e >\ ‹'( P'( '!% =#39' ,' !i"# !0i !$

iPa '(3 '3‡ $ !L !" !\'( BATV >p P'( !%&'( ! i9# $!+ ,' !i"# %&'(


23/87


'!% i9# $!+ !a Di@' e A !$ C' >\ . Vr P0'( >?'( =#39' i ,' !i"#

%&'( '@' !" !\'( SB 3@# $C# /e (i =€ SNR $ 0i !, !# $‚'( '!J'( 5#3

€'! 9 ,'! #3+' ,'! '(!i@/ '( \i ới '(#f' 5#'( :@'! =#39'.T='( !" !\'( 5#'( SB %&'( ‡ /Ži >?'( /'( ! %-$ i9# $!+ Dyi $$

!%&'( ! i9# $!+ %&'( ‡ ># ? $!c'( >ƒ %-$ (![ 0i Dyi De :+ !- $2'(

>#b. T,' !i"# ># :!i %-$ ?'( (?i '3 >ƒ %-$ P‚'( L i9# $!+ $%}'( e =$ i+

/e >a= D' P‰' %-$ $b P'( !k' $$. B2'( >#b =#39' i %-$ DiL# Piv' '!%

>#„

g).1

Với $2'( >#b C# = 0i /‹$ !k' $$ $F >a= ‡ ‡ ‡ C' %- !" >\

i9# $!+‡ Di@' e‡ C' >\ ! %&'( ‹'( ới >?'( /'( ! !‹ . B$ !2'( >\ '3

‚3 !#e$ $$ !%&'( ! i9# $!+ A‡ !$ .

B2'( >#b 0i C# !# $Œ'( $? !L %-$ i+ 0i '!% =@' '+# :@'! =#39' #3+'

,'! !' '. T=@' !$ + !r ,' !i"# %&'( >ƒ D€ Di+' P0'( =@' %}'( =#39' P

!i"' %-'( /[ w#3@' i9# $!+ Ih. xb :ˆ ,'! !i #3+' ' f' 0i ='( >a= D'

P‰' y /3 ! ='( >-i 5#'( 9# 0 = $$ C' >\ :!2'( /'( /#\' '!%

!$ 'l/ ='( Dt'( !2'( #39' P‰' / /[ ,' !i"# %&'( . e

i $& $!+ :!$ '!% ' >‘$ >-i 5#'(‡ C' >\ $!i= $? !L (k3 = Ih‡ E'! !%y'(

$F $!c'( +' !" !\'( SB %-$ '(!i@' $‹# =e'( =…i.


24/87


Hi"# 't'( $F /e !" !\'( !%}'( %-$ '! (i Dyi !2'( >\ SNR i@' 5#'

+' ,' !i"# … %-$ (iEi i9# $!+. T='( =%}'( !- '!% !" !\'( SB ,' !i"# %&'(

‡ Š >\ CNR %-$ >p P'( !3 $! SNR. CNR %-$ €'! '(!› $2'( >#b $F >?'(/'( =@' $2'( >#b '!iv# 0i /3 !#‡ $? !L %-$ i+ '!% ># „

Với m !" >\ i9# $!+‡ R e '!03 !# $F !PiPa‡ $2'( >#b 5#'( =#'(

Dr'! !# %-$ ‡ ‡ C' %- (i =€ !i"# P'( P'( '!iv# D‘'‡ '!iv#

'!i"‡ '!iv# $%}'( e‡ Ih. GiE >p '!iv# $%}'( e %&'( \i $F >a= g RIN #3+'

,'! ='( Dl'( C' !#‡ $? !L i+ „ gR ) g) g).7

Gi =€ 3@# $C# $F CNR $F !" !\'( SB ‚3 !#e$ !%&'( ! i9# $!+.T='( =%}'( !- i9# $!+ A‡ (i =€ $F CNR !2'( !%}'( =@' Px 0 3@#

$C#. N!#b ! !Ei =@'1/‡

k3 /e (i =€ :!2'( !b ='( !2'( i' 5#'(. T!‹ !i‡ '!iv# $%}'( e 0i /3

!# >ƒ Š " ới Dr'! !%&'( $F . K!i '!iv# $%}'( e ớ' !&' '!i9# > ới $$ 0i

'!iv# :!$‡ CNR >ƒ =y '@' e$ ới $2'( >#b 5#'( !# %-$ „


25/87


V, P‡ ới /e >a= $? RIN ž 1Px“H’‡ ž.1 ž H’ ‡ !r CNR >ƒ $?

(i =€ Px. T='( =%}'( !- (i =€ RIN $'( ớ'‡ L E/ DE CNR !a 3@# $C#‡

$!” $? !L t'( $!” >\ i9# $!+ !$ (iE/ Dt'( !2'( !#. T!$ + !r 0i >a= hx

$? (i =€ RIN !b … %-$ >E' w#b ='( '!J'( 't/ 1 L !$ $! !" !\'(

BATV. T#3 '!i@'‡ '(3 $E :!i … $? /e >a= ới RIN !b !r '!iv# $%}'( e ‰'

/e b' 9 5#' ='( ='( !" !\'(. N(#3@' '!k' P '!iv# $%}'( e %&'( \i

‰' $? !L t'( @' ='( >#\ 5# =r'! =#39' =@' >-i 5#'(. e ='( '!J'( $& $!+

'!% \ :!$ '!# >ƒ =#39' i ới $$ \$ e :!$ '!#. K+

5#E / $! '!J'( Di+' e'( 9 C' >\ $!#3L' ji >'( '!J'( Di+' e'( 9 $%}'(

e‡ i9# '3 ! !#e$ Dt'( !2'( >a= Š " ới Dr'! !%&'( $F $!i9# Pi >-i

5#'(. e >\ :; !#


26/87


T!$ + !r '!iv# 0i /3 !# ='( !" !\'( ~SB %&'( 0i D‘ '(#f' † '!iv#

'!i" $!F 3+#. T?/ 0i‡ $E !i !%&'( ! i9# $!+ A 9# … %-$ >p

P'( !'! $2'( ='( !" !\'( 5#'( SB %&'( .2;4 H. )-l+, CM )A+ -'.= Rl

V '!J'( 't/ 1‡ !" !\'( SB … $? '!J'( D%ớ$ P€$! $!#3L' † i9# $!+

%&'( >'( i9# $!+ >\. SK %-$ >p P'( L i9# $!+ >?'( /'( !‡ :/ !a ?

:; !#?'( :+ !- g$!a=a' 0i /3 !#. e :@'! =#39' !r'! >\ 3@# $C#

\$ e Di !Ei ớ' !&' 1D“> $‚'( Dt'( !2'( =e'( !&'‡ =i '(%-$ ới $$ :@'!

%&'( $C' Dt'( !2'( :!E'( 6 H’. B!,'! r d P ?‡ /e >\ !%&'( ! i9#

$!+ :!$ … %-$ ! =iL' '!% ~QA‡ QSK. N+# 0i Pi"' $! >\ /‹$ =}i =0$

%-$ >p P'(‡ !r ,' !i"# >\ :!2'( y P0'( '!€ !k' %-$ (i ~=3 r /Ži Di $?

!L $? Di@' e :!$ '!#. T,' !i"# '3 $? !L %-$ :!2i !$ 0i /3 !# / :!2'(

>p P'( :; !#?'( :+ !-‡ f'( !}i 3@# $C# CNR $? (i =€ !b !&' > ới

!" !\'( A~SB %&'( . h#'( %-'( $F /e !" !\'( SB r !+ $? !L t'( @'

'( :L Dl'( $$! :+ !- (iJ i9# $!+ ,' !i"# >\ %&'( .

{L 0 = $$ ,' !i"# QA † /e $!#Ži Di '!€ !k'‡ !i !$ '!i9# !&' $$ Di

i9' :9 %-$ (![ 0i ới '!# '!l/ 0 = ,' !i"# '!i9# /‹$. GiE >p '+# !i Di i9'

:9 %-$ (![ '!# !'! /e $‡ >ƒ 0 = /e P'( Di ới \$ e Di … (iE/ i

/e 'J > ới D' C#‡ (f/ 4 j !- ># „ ‡ 1‡ 1‡ 11. {L $! Di" (iJ 1 1‡

! $F ,' !i"# !Ei %-$ w[ +'. Vi"$ >p P'( !i >?'( /'( #2' ! '!# %-$

w[ +' '@' /ới $? @' (i i9# $!+ Di@' e $C# !%&'( QA. B !L !&'‡ !%&'(

=r'! DiL# Piv' j !- !‹ '!% ># „

g).


27/87


Với $? (i =€ † 1 +' 4‡ C' >\ >?'( /'( !‡ $? !L ‡ ¡“)‡ ¡ !$ 7¡“)

%&'( ‹'( ới 4 j !-. B‚'( d %y'( '!% p P'( !%&'( ! i9# $!+ ~QA !r

>\ %-'( :@'! ,' !i"# >\ $? !L 0 +' 8 :@'!. V 't/ )‡ '(%}i … !'!

$2'( :!i =#39' M8 :@'! >p P'( !%&'( ! i9# $!+ 64~QA ới :!E'( $$!

=#39' M4 :/. Ži :@'! $? \$ e Di 7D“> '@' P#'( %-'( j'( )‡74GD“>.

e i9# !c € $? !L i+ $ t'( P#'( %-'( $F !" !\'( !&' 'J Dl'( $$!

:+ !- :; !#


28/87


Hr'! ).7 S& f !" !\'( SB“h

Hr'! ).7 >& f $F /e !" !\'( :+ !- SB h. N!i9# >?'( /'(

5#'( ¢1‡ ¢)‡..‡ ¢/ %-$ =#39' i =@' $‚'( /e >-i $ 5#'( Dyi :; !#?'( /'( 5#'( 0i /'( ' :@'! SB >p P'( $$ >?'( /'( ! %&'( ‹'( =a51‡

=a5)‡..=a5 '. T $? !L =#39' '!i9# ,' !i"# y P0'( >\ ‰' %&'( Dl'( $$! >pP'( $$ >?'( /'( ! !$ $$ >?'( /'( 5#'( :!$ '!#. Ki+' =c$ /0'( '3 $?

%# iL/ $$ :ˆ j' €'! Pv P'( 'k'( $b ‚3 !a '!# $C# ! =iL' $F !"

!\'(. V '!J'( 't/ 1‡ '(%}i … !'! $2'( ='( i"$ !i+ :+ /e !" !\'(

>p P'( 16 >a= hx ới :!E'( $$! (iJ $$ D%ớ$ >?'( )'/ ='( $p >j

1'/ %-$ i9# $!+ Dyi 1 :@'! iPa %&'( 6 :@'! ,' !i"# >\ 6))D“>. V

Dt'( !2'( $! /e !" !\'( :!i >p P'( /e >a= hx =#39' 1 :@'! iPa SB

7~M H’. Với r/ 't'( (C' '!% 2


29/87


T#3 '!i@'‡ '!k' \ / !0' $!+ !" !\'( SB >?'( /'( $!,'! '!iv#

w#3@' :@'! D‘ '(#f' † $$ 5# =r'! wp d #3+' ,'! ‰' !i #3+'. T,'! !i #3+'

(k3 = $$ /[ w#3@' :@'! !2'( 5# $$ !i"' %-'( SRS *. Hr'! ).4 DiL# Piv':+ 5#E $F !, '(!i"/ '!iv# w#3@' :@'! $F 5# =r'! =#39' !i :@'! $‚'( c$ ới

> %ớ$ ,'! =@' d !#3+ :+ 5#E 0$ (C' (i\'( '!# \i ới SRS *.

e :@'! %-$ i9# $!+ /'( !2'( i' ='( :!i ? :@'! $' 0i $!” >?'(

5#'( i@' $‡ > $!@'! "$! 9 D%ớ$ >?'( (iJ !i :@'! =#39' ¢ P | ¢B ž 8.'/

\i ới !r'! ¢B | ¢P ž 8.'/ \i ới !r'! D. T!'! !C' SRS (iE/ :!i C' >\

i9# $!+ t'(‡ ='( :!i !'! !C' * 0i t'(‡ '!%'( $? (i =€ (C' '!% '!# ='(

$E !i =%}'( !-. Hi !'! !C' '3 f'( ! ='( =%}'( !- ¢P £ ¢B '@' j'(

$F $!c'( ớ' !&' > ới =%}'( !- $' 0i.

{\i ới !i"' %-'( /[ w#3@' :@'! #3+' ,'! P > (i ! !$! 5#'(.

Hi"' %-'( '3 wE3 = :!i !i !$ '!i9# :@'! >?'( /'( ! %-$ =#39' $‚'( c$

=@' /e :@'! 5#'(. Vr $$ >?'( /'( 5#'( $? C' >\ :!$ '!# 2i $!c‡ 0 '@'

P'( '!iv# !$! y !PiPa. N+# /e C' >\ '!iv# !$! '3 $!f'( @' /e >?'(

/'( ! >ƒ (k3 = '!J'( >i "$! y 5# =r'! $! >?'(.

Hr'! ).4 N!iv# w#3@' :@'! %-$ %ớ$ ,'! 0$ !$ + ới $2'( >#b ! =#'( Dr'! 11/ =@' 5#…'( %}'( Pi ) :/.


30/87


Với '!J'( $ ,'! %# i" $F /r'! ‡!" !\'( SB >?'( /'( =b !J# ,$!

='( $$ ‹'( P'( /0'( zAN AN. N? $? !L $#'( $b P€$! '!% ,' !i"#

!0i‡ =#39' !r'! >\ %&'( ‡ PJ i"#q$!” ới /e De ! 5#'( /e De !#5#'( $! /Ži !#@ D r '!J'( P€$! :!$ '!# >ƒ >p P'( '!i9# >?'( /'( !

:!$ '!#‡ / (i !'! $$ !i+ D€ =#3 $ :+

!- $F :; !# !" !\'(.

2;` K() i=+ >-?@+,

Nei P#'( y =@' … =r'! D3 :!i 'i"/ $& DE' 9 :; !#\ ‰' f' 0i >'( >'( P =@' '!J'(

‹'( P'( :!$ '!#. Vi"$ =#39' $E !i P0'( ,' !i"# Dyi $‚'( /e !" !\'( '!# $C#

!i+ !$ / :; !#


31/87


!2'( =e'( P#'( %-'( 2 $‚'( ớ' … %-$ !r'! !'! Dl'( $$! :+ !- (iJ

SB h. B$ !i+ D€ !$ $! !i :; !#p

P'( !%&'( ! (![ :@'! SB“h >ƒ / !i"# >#b !" !\'( t'( @' %- =ei‡

(? !C' ‹'( '!J'( '!# $C# !2'( i' ='( !i"' 0i $E %&'( i ># '3.


32/87


CHƯƠNG 3

TmNG :U$N V" H# THnNGTH7NG TIN :U$NG C&HNC

3;1 G'-?@+,

H" !\'( !2'( i' 5#'( $!a=a'$a !" !\'( >p P'( !%&'( ! $! >?'(

:+ !-‡ '? $? '!J'( %# iL/ %- =ei > ới !" !\'( i' 5#'( >p P'( !%&'(

! $! >?'( =$ i+. e i '(!i@' $‹# $! !b3‡ i9/ 't'( $F !" !\'( !2'(

i' 5#'( $!a=a'$a ='( $$ ‹'( P'( !$ + ‰' $' =b ớ' w# !%ớ'( b 3+#'!l/ ‹'( '!# $C# !2'( i' '(3 $'( t'( $F $' '(%}i.

B!%&'( '3 ƒ %-$

Di+' ji =$ i+ =y 0i !'! ,' !i"# i"' '!} De $! >?'( !PiPa D' P‰'. T,'

!i"# i"' ># :!i $! >?'( 5#'( >ƒ Š " #3+' ,'! ới $%}'( e '! >'( ới. H"


33/87


!\'( '!% p P'( =e'( =…i '!} %# iL/ &' (iE' (i !'! =–. S'( :; !#p P'( !i"# 5#E Dt'( C' $F >-i &' /Pa !i"' '3.

B$ >-i $ 5#'( !2'( !%}'( !i"' '3 $? !L ‹'( Dt'( C' 7TH’‡ ='(

:!i !" !\'( 5#'( I~hh $!” /ới 0 \$ e 14D“>‡ 6D“>‡ ).GD“> ới $ 3 i

$!$ :/ /e >\ , !" !\'( 1GD“> $!% %-$ !j Di+'. $ :!$‡ !" !\'( '3

$' $? '!%-$ iL/ 'J Š >\ ,' !i"# =@' '!iv# 0i C# = $F De $! >?'( !b‡ e

'!03 /3 !# :!2'( $ / :!E'( $$! =#39' P‰' D€ !0' $!+. {f'( !}i P !# ,'

!i"# !a '(#3@' d $! >?'( =$ i+‡ :!2'( 5# ji C'‡ '@' /3 !# :!2'( !L

$!' $$ :@'! 5#'( ‚3 d ='( /2i =%}'( :@'!. T=%ớ$ r'! !r'! ?‡ :; !# ji C' $F >?'( /'(

5#'( %-$ !$ !i"' y /3 !# Dl'( $$! =e' =%}'( $F ,' !i"# +' ới =%}'( $F

De P e'( 'ei 0i !PiPa‡ P'( i"' = gy P…i C' 2 #3+' ” " ới Dr'! !%&'(

$F j'( !i $%}'( e i"' =%}'( '3. # iL/ $F '? / $! e '!03 !# t'(

:!E'( )Px > ới !" !\'( I~hh‡ f'( !}i t'( !i"# 5#E >p P'( !j $F >-i

5#'(. H" !\'( '3 $? '!J'( iL/ :!$ Di" > ới !" !\'( I~hh '!% ># „

− T,' !i"# %-$ i9# $!+ y !, ! $? 3@# $C# $ 9 e =e'( !j j' €'!

C' >\.− {e !k' $$ $F '! >'( %-$ (iJ '(#3@' ='( 5# =r'! =#39'.


34/87


− T=%ớ$ :!i $! >?'( y !, !#‡ '! >'( +' %-$ =e' ới '(#f' >a= (i

e'( 'ei 0i /3 !#. N!% ?'( 5#'(.H" !\'( B!a=a'$a … %-$ '(!i@' $‹# '!J'( 't/ 18‡ #3 '!i@' P

'!J'( !'! # ='( i"$ ! =iL' $$ De :!#+$! 0i 5#'( `hA ‰' ‹'(

%-$ '!# $C# $F $' '(%}i ='( !}i (i' 5# '@' i"$ !%&'( /0i !? '!J'( !i+

D€ P'! $! !" !\'( $!a=a'$a D€ =r !…'. N!%'(‡ ới > ! =iL' /0'! /ƒ ='(

›'! $ iv' !2'( '(3 '3 $E %&'( i‡ !" !\'( '3 … %-$ i+ $ '(!i@'

$‹#‡ % ‹'( P'( 0i /e >\ '%ớ$ i@' i+' >ƒ '!'! $!?'( %-$ !%&'( /0i

!? ='( %&'( i (C'.

3;3 Cp= )Qq> -. )-l+, )-+, )'+ J=+, >Y-oQo+>o

S& f :!\i j'( 5# $F !" !\'( !2'( i' 5#'( $!a=a'$a %-$ $! '!% !r'!

7.1 P%ới k3. B? !L $!i '? / D !C' „ /3 !‡ >-i 5#'( =#39' P‰'‡ /3 !#.

T >ƒ !k' ,$! $$ !'! !C' !i+ D€ ='( /3 ! /3 !#.

Hr'! 7.1 S& f j'( 5# $F !" !\'( !2'( i' 5#'( $!a=a'$a.

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35/87


3;3;1 M -)

3 ! ='( !" !\'( '3 D (f/ $$ !i+ D€„ De i9# :!iL'‡ >a= D' P‰'‡

De i9# $!+ ,' !i"#‡ '(i = $' $? De i9# :!iL' :!#+$! 0i $2'( >#b :!i $C'!i+. {$ iL/ $F %'( !i+ D€ '!% >#„

− z>a= D' P‰'

T!%}'( 0i hx‡ $? e =e'( !j !¥ ≤ .1'/‡ !$ $$ 0i >a= $? De $e'(

!%y'( '(i‡ !3 >a= $$! p $? e =e'( %}'( ≈ 1 ÷ 1 H’.B$ aP >a= /Pa $? e =e'( !j ớ' !r :!2'( !,$! !- r %}'( !j

$F '(#f' 5#'( !Ei !¥ !&' e =e'( Dt'( C' ,' !i"#. Vi"$ j' €'! C' >\ !0 e'(

$F >a= %-$ $!c ='( !2'( 5# i"$ (i/ > '!i" e w#'( 5#'! DE' !k'

>a=.

− xe i9# $!+ $? !L !$ !i"' Dl'( /e ='( !i $$! >#„

{i9# $!+ =$ i+‡ De i9# $!+ i9# :!iL' =$ i+ P'( 'ei w0 $F >a=. H$‡

i9# $!+ '(i‡ >p P'( $$ !i+ D€ !,$! !- i9# :!iL' =%}'( '! >'( ! = ới

$$ :; !#-i 5#'( L '(t' '(† $$ !'! !C' '! >'( !E' w0 9 ‡ (k3 Db j' €'! $! >?'(

/'( 5#'( e =e'( !j $F >a=.

− B$ De i9# :!iL' $2'( >#b 5#'( $? '!i"/ † e'( D‚ ‘ > >#3 (iE/

$2'( >#b !. e !C' ,' !i"# !2'( i' !fi i+ † /3 ! 9 De i9# :!iL' $2'(

>#b L wp d i9# :!iL' P'( >a= > $! !‚ !- .− xe :!#+$! 0i $2'( >#b 5#'( $? i = 'k'( /‹$ $2'( >#b 5#'( ># :!i 9#

$!+ @' /‹$ $C' !i+ P >#3 ! =@' %}'( =#39'. S\ De :!#+$! 0i D€ (iới !0' Dyi


36/87


$$ '!iv# !i #3+'‡ '@' >p P'( '? '!% !+ '‡ ới e :!#+$! 0i D '!i@# $C' !Ei

%-$ :!E > :;.

N!r' $!#'(‡ $$ !i+ D€ y /3 ! :!2'( $? > :!$ Di" /b3 > ới !" !\'(I~hh !2'( !%}'(. {iL/ 5#' ='( L !k' Di" !i !" !\'( '3 $!,'! /3

!#‡ ># k3 >ƒ w[ $!‹$ 't'( $$ !i+ D€ 0i /3 !# $!a=a'$a.

3;3;2 M )-=

{k3 !C' 5#' ='( '!b !‹$ 0 '!b‡ $ =%'( $! !" !\'( !2'( i'

5#'( $!a=a'$a. Gf/ $$ !i+ D€ „ >a= P e'( 'ei‡ De =e' 5#'(‡ !PiPa $!

>?'(‡ De :!#+$! 0i ,' !i"# i"'‡ /0$! $ !2'( P…i‡ De (iEi i9# $!+ /0$! 5#3+

€'! '!l/ :!2i !$ ,' !i"# ># (iEi i9# $!+.

− z>a= P e'( 'ei $? $b# =c$ (i\'( ới >a= !‡ $!” $? /e iL/ :!$ Di"

y :!E 't'( i9# $!”'! C' >\ ! ='( /e :!E'( =e' L E/ DE C' >\ ,' !i"#

># :!i =e' #2' j' €'!. TC' >\ $F >a= P e'( 'ei >a= ! $? !L (i\'(

'!# ='( =%}'( !- !# f'( C'‡ !$ :!$ '!# ='( =%}'( !- !# ji C'.

− xe =e' 5#'( $? !i '(š ‡ /e P'! $! ,' !i"# 5#'( /'( !2'( i' %-$

=#39' +' ‡ '(š $' 0i $! ,' !i"# 5#'( † >a= P e'( 'ei‡ $!c'( %-$ =e'ới '!# $e'( #3+' ,'! 0i C# =. N? $? !L %-$ $b# 0 † (%&'( D' !E' w0‡

!i t'( :,'! a= P e'( 'ei

(k3 E'! !%y'( +' 5# =r'! $! >?'(.

− !PiPa $! >?'( $‚'( ới De =e' !0 e'( '!% /e $!#3L' ji C' >\

!b ='( =%}'( !- !# ji C'‡ !$ '!% /e De $! ! :!i !# f'( C'.

− xe :!#+$! 0i ,' !i"# i"' $? '!i"/ :!#+$! 0i ,' !i"# † !PiPa $!

>?'(‡ E/ DE F $2'( >#b $! 5# =r'! wp d y $$ !i+ D€ !, >#.


37/87


− xe $ !2'( PEi„ $ '!iv#‡ $!” $! '!J'( ,' !i"# ='( Dt'( !2'( $F De $

i 5#‡ $$ !'! !C' :!$ D€ 0i Ds.

− xe (iEi i9# $!+„ i+' !'! (iEi i9# $!+ ới !%&'( ! (i\'( '!% ='( De

i9# $!+ y /3 !# L :!2i !$ 0i ,' !i"# (\$.

T='( !$ +‡ $? /2 !r'! /3 !# %&'( ‹'( ới !i '(#3@' d !# :!$ '!#

='( !" !\'( $!a=a'$a. Ži 0i 9# $? '!J'( %# iL/ $‚'( '!%-$ iL/ =i@'(‡ i"$

>p P'( $!c'( ='( =%}'( !- ' $C' !Ei wa/ w[ $k' \i $$ 3@# $C# !$ +.

!C' '3 >ƒ %-$ =r'! D3 ='( $$ /$ i+ !a.

3;4 N,=+ ir -YE) ^s+,

T='( !" !\'( $!a=a'$a‡ '! >'( %-$ 5#' 'i"/ '!% P0'( >?'( i"' †

=%}'( 0i C' >\ >i@# $ gi =t/ '(' GH’‡ %-$ wp d '!% /e >?'( /'( 2

#3+' '(!› $? !L i9# $!+ Di@' e‡ C' >\ !$ i9# $!+ !. Hr'! 7.) /2 E >& f

'(#3@' d !0 e'( $F !" !\'( !2'( i' 5#'( $!a=a'$a.

K!$ ới !" !\'( I~hh‡ ='( !" !\'( $!a=a'$a > ji C' $F >?'( /'(5#'( g$!#3L' ji !'! ,' !i"# i"' %-$ !$ !i"' y /3 !# Dl'( $$! =e'

=%}'( $F ,' !i"# +' ới =%}'( $F De P e'( 'ei =@' D9 / !PiPa =%ớ$

:!i % De (iEi i9# $!+.

GiE !#3+ =t'( =%}'( i"' =%}'( $F ,' !i"# 5#'( %-$ =#39' i P%ới P0'(

>?'( !¦'( „ E S (t) = E S cos§ω S t + φ S (t)¨ g7.1

T='( ? „ `S Di@' e $F =%}'( ,' !i"# 5#'(

ω S C' >\ (?$ $F >?'( /'( 5#'(

φ S (t) ! $F >?'( /'( 5#'(

T,' !i"# =xe =e'

3 !#

Ti9' Kh $

GiEi i9#$!+

T,' !i@# =#'( C' g

z>a= P e'( 'ei

S-i 5#'(

z>a=

PiPa

%&' h&T,'!i"#

ASK‡SK‡SK


38/87


xe i9# :!iL' '!ƒ %-$ =#39' +' /3 !#.

T0i /3 !#‡ (iE >p =l'( =%}'( P e'( 'ei $? P0'( „

E LO(t) = E LO cos§ω LOt + φ LO(t)¨ g7.)

Với E LO Di@' e $F =%}'( P e'( 'ei

ω LO C' >\ (?$ $F =%}'( P e'( 'ei

φ LO(t) ! $F =%}'( P e'( 'ei.Q# =r'! =e' (iJ ,' !i"# 5#'( +' ,' !i"# 5#'( † De P e'( 'ei %-$

i+' !'! =@' D9 / $F !PiPa %&'( '!% \i ới /3 !# $! >?'( =$ i+

hh. h'( i"' igt I P >i'! = ='( !PiPa‡ (i ‘ P'( !‡ ” " ới $2'(

>#b 5#'( P t g i %-$ ,'! !a DiL# !‹$ „

igig t RP t I P = g7.7

Với R !" >\ $!#3L' ji $F !PiPa‡ $! Di+ :!E 't'( Di+' ji $2'( >#b 5#'(

!'! P'( i"' „ ©h

eR

η = . T='( ? η !i"# >#b %-'( p $F !PiPa‡ ν h

't'( %-'( $F !' a i"' ,$! $F /e aa$='.

{i9#$!+

Hr'! 7.) S& f '(#3@' d $F !" !\'( !2'( i' 5#'( $!a=a'$a


39/87


B2'( >#b 5#'( i"' =%}'( j'( % +' !PiPa i@' !" ới '!# !2'(

5# !l'( >\ ™ !a DiL# !‹$ ># „

[ ] )) igig1ig1ig t E t E Z

t E Z

t P LOS

+== g7.4

T!3 $$ DiL# !‹$ g7.1 g7.) DiL# !‹$ g7.4 Di+' ji %-$ „

)ii¨g$G>giig$G>g§

1ig t t E t t E

Z t P

LO LO LOS S S φ ω φ ω +++=

⇒ [ ]

+++= ig$G>igi~g$G>

)

1

)

11ig )) t t t E E E E

Z t P

LOS LOS LOS θ φ ω ω g7.

Với„

φg ž φSg ~ φz_g e "$! ! (iJ ,' !i"# 5#'( +' ,' !i"# P e'( 'ei.

B$ !'! !C' C' >\ LOS LOS ω ω ω ω +‡)‡) %-$ Ds 5#‡ P De $! >?'( :!2'(

‹'( $$ C' >\ '3.

ig$G> t θ DiL# !€ e "$! !k' $$ (iJ >?'( 5#'( +' >?'( $F De P e'( 'ei„

LOS

LOS

E E

E E

.

.$G> =θ .

N(i =‡ LOS f f ‡ C' >\ >?'( '! >'( ‡ $— i =t/ '(' GH’. Gi =€ =#'( C'

π

ω ω

)

LOS

IF f

−

= 'l/ ='( PEi >?'( 2 #3+' %-$ $!' † i GH’ +' !'( $!$ GH’

‚3 !#e$ \$ e =#39' P‰' !%&'( ! i9# $!+.

T='( !$ +‡ e "$! !k' $$ C' >\ =#'( C' $F /3 !# %-$ (iJ j' €'!

'!} /0$! :iL/ > !k' $$ /0$! e'( :iL/ > C' >\ AB !a '(#3@' d

!fi i+.

T!3 P t g i ='( g7. DiL# !‹$ g7.7‡ %-$„

+−++= ig$G>i¨gi$G>§g

)

1

)

1ig ))

))t t t

ZZ

E E E

Z E

Z R

t I

LOS

LOS

LOS

P θ φ ω ω g7.6

S#3 = DiL# !‹$ ,'! igt I P „


40/87


iig$G>iªg$G>«)igig t t t P P R P P Rt I IF Lo s LOS P θ φ ω +++=

g7.M

Với LOS P P ‡ C' %- $2'( >#b 5#'( !i"# P'( $F ,' !i"# ,' !i"# † De

P e'( 'ei. T!2'( !%}'( $!' S LO P P >> ‡ LO P /e !l'( >\ '@' !'! !C'

!‹ '!b ='( g7.M wa/ '!% !'! !C' /e $!i9# $? !L Ds 5#. N(i =‡ '+#

(iE >p (?$ !k' $$ (iJ >?'( ,' !i"# +' >?'( De P e'( 'ei θ g it = R g'!} De

i9# :!iL' !k' $$ !r P'( ,' !i"# y C# = !PiPa $F /3 !# $!a=a'$a

%-$ DiL# Piv' (iới P0'( >#„

i¨g$G>§)ig t t P P Rt I IF LOS P φ ω +=

g7.8

T‚3 !#e$ /\i 5#' !" (iJ C' >\ 5#'( $F ,' !i"# +' ới >?'( 5#'( $F

De P e'( 'ei / $? !i 0i /3 !# $!a=a'$a. {? /3 !# $! >?'( f'(

C' /3 !# $! >?'( ji C'. K!i !i C' >\ 5#'( '3 Dl'( '!# !r R= IF ω ‡ >ƒ

$? /3 !# f'( C'gH/P3'a haa$i'‡ ># :!i $! >?'( ,' !i"# >ƒ %-$ :!2i

!$ 0i Dt'( C' $& >y '!% y /3 !# $! >?'( =$ i+. V :!i !i C' >\ 5#'( :!$

'!# ‡‹$ R≠ IF ω ‡ >ƒ $? /3 !# $! >?'( ji C' gHaa=P3'a haa$i'. B!c'( >ƒ :!E > $ !L !i 0i /3 !# '3 y !C' i+ !a.

3;\ C> O )-=) )>- RS+, )QY+, D )-= CY-oQo+>o

3;\;1 T>- RS+, ̂ t+, )+ uHoDYf+o 0o)o>)'Y+v

!%&'( ! '3 $!' C' >\ P e'( 'ei ω LO Dl'( C' >\ >?'( /'( 5#'(‡

'@' R= IF ω . N+# (iE >p (?$ !k' $$ (iJ >?'( ,' !i"# +' >?'( † De P e'(

'ei θ g it = R g'!} De i9# :!iL' !k' $$‡ !%&'( =r'! g7.8 =y !'! „

ig$G>)ig t P P Rt I LOS P φ =

g7.


41/87


*[ !@/ =%}'( !- ! $F De P e'( 'ei %-$ :!? > ới ! $F >?'(

/'( 5#'(‡ P‰' +' φg ž . T† DiL# !‹$ g7.‡ $? P'( ! $! >?'( f'( C'

'!% ># „ LOSP P.PR2 )t ( I = g7.1

N+# > >'! ới P'( ! ='( !%&'( ! $! >?'( =$ i+

I DD(t) = RP S. T !b3 =l'(‡ $2'( >#b ,' !i"# i"' =#'( Dr'! %-$ t'( @'S

LO

P

P 4 C'

:!i >p P'( $! >?'( f'( C'. h ?‡ e '!03 /3 !# >ƒ t'( !&' > ới $! >?'(

=$ i+.

e %# iL/ 'J $F !%&'( ! $! >?'( $!a=a'$a %-$ !L !i"' 5# DiL#!‹$ g7.. T!a ?‡ $! P‚ R= IF ω i $!t'( 'J‡ !r !'! !C' ! $F ,' !i"# '@'

$? !L =#39' !2'( i' Dl'( $$! i9# $!+ ! $F >?'( /'( 5#'(. T='( :!i ?‡ !"

!\'( I~hh !r :!2'( !L >p P'( !%&'( ! '3 r b $E > !3 ji 9 ! 9#

/b. T#3 '!i@'‡ i9# '3 :!i !$ !i"' =@' !$ + !r 0i $!,'! '!%-$ iL/ $F

!%&'( ! $! >?'( f'( C'. Vr φg ž φSg ~ φz_g $!‹ !2'( i' 9 ! $F De

P e'( 'ei '@' '? $C' %-$ i9# :!iL' $\ €'!‡ '!l/ ='! > Di+' e'( $F φg.

V9 / d %y'( !r φS φz_ %-$ (iJ :!2'( ji‡ =† :!i >p P'( !%&'( ! i9#

$!+ φS. T!$ + !r i9# '3 :!2'( !L‡ r $E !i 9# !3 ji '(‰# '!i@' !a !}i (i'

'@' :!? (iJ $!c'( $\ €'! %-$. T#3 '!i@'‡ !i"# >\ $F $!c'( $? !L %-$ P#3 =r

:!2'( ji Dyi '( :!? !. N!%'( i"$ ='( D€ !@/ /e !i+ D€ '!%


42/87


{\i ới !%&'( ! '3‡ C' >\ $F De P e'( 'ei %-$ $!' :!$ ới C' >\

>?'( /'( 5#'(‡ > $! C' >\ =#'( C'π

ω ω

)

LOS

IF f

−

= 'l/ ='( PEi 2 #3+' †

i GH’ +' i $!$ GH’. K!i ? P'( ! $? P0'( '!% DiL# !‹$ g7.8.

BŒ'( (i\'( '!% $! >?'( f'( C'‡ !2'( i' %-$ =#39' i $? !L >p P'(

!%&'( ! i9# $!+ Di@' e‡ i9# $!+ ! !$ i9# $!+ C' >\ >?'( /'( 5#'(.

{f'( !}i‡ De P e'( 'ei :!#+$! 0i ,' !i"# '!\ $Ei !i"' ='( !%&'( ! '3 !b !&'

7Px > ới $! >?'( f'( C'. T!3 ?‡ !%&'( ! '3 / $! i"$ !i+ :+

/3 !# &' (iE' !&' '( :L r :!2'( $C' !i+ !Ei $? '( :!? !. {i9# '3 /

$! /3 !# $! >?'( ji C' !,$! !- ới $$ ‹'( P'( !$ + $F !" !\'( !2'(

i' 5#'( B!a=a'$a.

T$! >?'( ji C' $? !i 0i $! >?'( ji C' f'( De $! >?'( ji C'

:!2'( f'( De. Hi 0i '3 >ƒ %-$ =r'! D3 i+ !a k3.

7..).1 T>- RS+, ^w' )+ ^t+, s

S& f :!\i $F /3 !# ji C' f'( De %-$ !L !i"' =@' !r'! 7.7. h'( !

%-$ 0 = ># :!i !$ !i"' 5# =r'! $! >?'( 5#'(‡ %-$ =#39' 5# /e De $

!2'( PEi $? C' >\ =#'( k/ IF f . B$ !'! !C' '!iv# %-$ $ Ds‡ P'( i"' i

= De $ „

I f (t) = I P cos§ω IF t +φ ̈ g7.11

T='( ?‡ I P %-$ $! Dyi DiL# !‹$ g7.1.

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43/87


Hr'! 7.7.S& f :!\i $F /3 !# ji C' f'( De.

H" !\'( '3 3@# $C# !%&'( ! (iEi i9# $!+ f'( De‡ $C' :!2i !$ 0i >?'(

/'( 2 #3+' 0i C' >\ =#'( C' IF f . {L !$ !i"' i9# '3‡ /e '( :!? ! ,'

!i"# i"' $C' !Ei $? ='( $b# =c$ $F /3 !#. S?'( /'( =#'( C' %-$ :!2i !$

'!} De =e' '(š = $F zz ới ,' !i"# =#'( C'.

7..).) T>- RS+, ^w' )+ -+, ^t+, s

T w[ !%&'( ! $! >?'( ji C' f'( De $! D !%&'( ! i9# $!+ $&

DE' ASK‡ SK hSK. S& f :!\i $F /3 !# %&'( ‹'( ới D !%&'( !

i9# $!+ '3 %-$ =r'! D3 C' %- ='( !r'! 7.4‡ 7. 7.6.

Hr'! 7.4 S& f :!\i /3 !# ji C' :!2'( f'( De ASK.

H" !\'( '3 :!2'( 3@# $C# :!2i !$ >?'( /'( 2 #3+' '@' i"$ !i+ :+ De

!# &' (iE' !&'. T,' !i"# I f (t) %-$ $!#3L' ji >'( Dt'( C' $& >y Dl'( $$! >p

P'( $! >?'( %}'( D ‡ !a ># ? /e De $ !2'( !b. B$ !'! !C'

#2'( ! ='( ! '(i $F /3 !# 9# E'! !%y'( +' ,' !i"#‡ r !+ SNR

(iE/ > ới (iEi i9# $!+ f'( De.

T$! >?'(5#'(

x L-T$! >?'(%}'( D

xe Pe'( 'ei

T,'!i"#+'

T,'!i"#=


44/87


Hr'! 7. Piv' E >& f :!\i $F /3 !# ji C' :!2'( f'( De‡ (f/ !i De $

SK‡ '? >p P#'( !i '!'! =i@'( Di" L wp d $$ Di Di 1 ới $$ C' >\ >?'(

/'( $# $!c'(. 3 !# SK !i De $ $? !L %-$ wa/ '!% !i /3 !# ASK /e De $‡ P ? /i :+ 5#E ,'! ' =@' /3 !# ASK 9# >p P#'( %-$ $! /3 !#

SK.

Hr'! 7. S& f :!\i /3 !# ji C' :!2'( f'( De SK.

GiEi i9# $!+ :!2'( f'( De :!2'( !L >p P'( $! !%&'( ! i9# $!+

SK‡ r ! $F >a= ! >a= P e'( 'ei :!2'( %-$ :!? $? !L =2i !a

!}i (i'. T#3 '!i@'‡ i"$ >p P'( hSK $! ![ >p P'( (iEi i9# $!+ :!2'( f'(

De Dl'( $$! wp d =v /e Di '!% =@' !r'! 7.6 P%ới k3.

Hr'! 7.6 S& f :!\i /3 !# ji C' :!2'( f'( De hSK.

3;` M )-= >Y-oQo+>o )>- RS+, >x+ y+,

e (iEi ! $! b' 9 '!iv# Di@' e ='( $$ 0i /3 !# $!a=a'$a >p P'(

/e !PiPa >p P'( !%&'( ! $! >?'( $k' Dl'(. Hr'! 7.M $b# !r'! $F

/e /3 !# $!a=a'$a $! >?'( $k' Dl'(. e De $#a= 5#'( 7Px %-$ >p P'(

T$! >?'(5#'(

x zT$! >?'(%}'( D

xe P

e'( 'ei

T,'!i"#+'

T,'!i"#=

x zT$! >?'(%}'( D

T$! >?'(5#'(

x z

T=v 1 Dixe P

e'( 'ei

T,'!i"#+'

T,'!i"#=


45/87


L =e' ,' !i"# 5#'( +' ới De P e'( 'ei . S# ?‡ ,' !i"# :+ !- %-$

$!i = !i !C' ới e "$! ! (iJ $? ='( /Ži !C' .

Hr'! 7.M Bb# !r'! $F /3 !# $!a=a'$a $! >?'( $k' Dl'(.

Với $$ ,' !i"# 5#'( %-$ DiL# Piv' '!% ='( g7.1 g7.)‡ (iE >p ,' !i"#

5#'( +' De P e'( 'ei %-$ !\i !- !k' $$‡ i"' =@' !i !PiPa

%-$ w$ €'! '!% >#„

g7.1)

g7.17

Gi R !" >\ $!#3L' ji 5#'( i"' $F !PiPa‡ P'( i"' = $F /Ži

!PiPa „

g7.14


46/87


g7.1

Với C' %- $2'( >#b ,' !i"# +' $2'( >#b $F De P e'( 'ei‡

%-$ w$ €'! Dyi .

B#\i $‚'(‡ P'( = $F De $! >?'( $k' Dl'( %-$ w$ €'! '!% >#„

g7.16

Với e "$! ! (iJ ,' !i"# 5#'( +' De P e'(

'ei. B? !L !b3 :+ 5#E !# %-$ † !%&'( =r'! g7.16 g7.8 '!% '!#. T%&'(

‡ '+# !r >ƒ $? /3 !# !aa=P3'a '+# !r >ƒ $? /3 !#

!/P3'a.

3;a K() i=+ >-?@+,

T=@' k3 … =r'! D3 '!J'( 'ei P#'( $& DE' 9 !" !\'( !2'( i' 5#'(

$!a=a'$a‡ $b# =c$ $F !" !\'(‡ '(#3@' d !0 e'( $‚'( $$ !%&'( ! $!>?'( :!$ '!#‡ !a ? !r'! !'! !i 0i /3 !# %&'( ‹'(. T '!


47/87


− Tt'( Š >\ ,' !i"# =@' '!iv# e '!03 /3 !# .T† DiL# !‹$ g7.8 $? !L

!b3‡ $%}'( e P'( ! !' ' $? !L %-$ 'k'( @' :!i t'( $2'( >#b ,' !i"#

† De P e'( 'ei. K!i ?‡ De P e'( 'ei !0 e'( '!% /e De :!#+$! 0i ,' !i"#0i $!Ž $! ![ t'( e '!03 !# > ới $$ /3 !# $! >?'( =$ i+‡ $! ![ :[

Pi :!E'( $$! (iJ !i =0/ /‡ t'( \$ e !2'( i'.

− B#'( $b :!E 't'( $!' :@'! . 3 !# $!a=a'$a !0 e'( !a '(#3@' ‘$

$! >?'( ji C'‡ %&'( '!% /3 !# ji C' ='( /i9' >?'( 2 #3+'. K!E 't'(

$!' $ :@'! y !, !# P =@' :!E 't'( !3 ji C' >\ '! >'( $F >a= P e'(

'ei. h ? ='( /2i =%}'( :@'! ới $$ C' >\ u 1‡u )‡u 7‡q‡u ' ‡ $!” $C' !3 ji

C' >\ De P e'( 'ei u z_ > $! i LO IF f f f −= ‡ ới i f C' >\ $F :@'! !‹ i Db

:ˆ‡ !r /3 !# >ƒ '!p P'( $$

:; !#?'( $k' Dl'(‡ '(i i"$ !'! !C' /e $!i9# D€

0i Ds ='( :!i !$ !i"' 5# =r'! =† !i P'( i"' † $$ !PiPa‡ !'! !C'

'!iv# Di@' e $Œ'( D€ 0i Ds. $ :!$‡ $2'( >#b $F ,' !i"# +' $F De P e'(

'ei %-$ >p P'( /e $$! !i"# 5#E. Với '!J'( %# iL/ ?‡ !%&'( ! $! >?'(

$k' Dl'( !%}'( %-$ >p P'( ='( /3 !# $!a=a'$a.

− y = :!E 't'( :+ !- (iJ /3 !# $!a=a'$a $$ De :!#+$! 0i 5#'( >-i

`hA. N!% … =r'! DE3 y =@'‡ DE' !k' /3 !# $!a=a'$a $! e '!03 $‡ '+# :+

ới $$ De `hA >ƒ / e '!03 !# t'( @' '( :L‡ $? !L 0 '@' $$ #3+' =#39'

P‰' $? P#'( %-'( ớ' :[ Pi :!E'( $$! =#39' P‰' (iJ !i =0/ . K!E 't'(


48/87


'3 %-$ ‹'( P'( $! $$ #3+' %}'( =$ #3+' $ 5#'( P%ới DiL'. T#3 '!i@'

> :+ !- '3 >ƒ 0 = '!i9# 0i '!iv#‡ > $ e'( $F '? +' ' De !" !\'(

!+ >‹$ !‹$ 0. h ?‡ $C' i+' !'! :!E >‡ ,'! ' :; %—'( L r/ = !%&'(' >p P'( \ '!b '!l/ 'k'( $ '!J'( %# iL/ >¬' $? $F $!c'(.


49/87

Chương 3: Tổng quan về hệ thống thng t!n quang C"h#$#n%#

CHƯƠNG 4

PHzN T{CH H# THnNG &Z GHjP K8NH ÓNG M$NGPHỤ | 0ỤNG MÁ6 THU C&HNC

4;1 G'-?@+,

T='( $!%&'( '3‡ ,'! !i"# 5#E $F !" !\'( R (![ :@'! >?'( /'( !

gR“SB >p P'( /3 !# B!a=a'a >ƒ %-$ !k' ,$!. T† $$ :+ 5#E !$ '(!i"/‡

L (iE/ E'! !%y'( $F ' >‘$ /# t'( :!E 't'( >p P'( Dt'( !2'( !i"# 5#E‡

!%&'( ! i9# $!+ &' Dt'( ,' !i"# 5#'( >ƒ %-$ >p P'(. N(i =‡ \$ e PJi"# $F /Ži :@'! >?'( /'( ! !b '@' E'! !%y'( $F ' >‘$ /# (C' '!% %-$

0i Ds.

!%&'( ! $! >?'( $k' Dl'( >p P'( !i !PiPa ='( /3 !#

$!a=a'$a %-$ 9 >#b ='( !" !\'( '3 :!2'( $!” Dyi :!E 't'( '[' !'! !C' /e

$!i9#‡ / $' >p P'( $2'( >#b ,' !i"# +' $F De P e'( 'ei /e $$! !i"#

5#E. S& f !" !\'( /2 !r'! ,'! ' L !k' ,$! $Œ'( >ƒ %-$ =r'! D3 ='(

$!%&'( '3. Ti+ !a‡ /e > > >'! (iJ !" !\'( SB“R >p P'( /3 !#$!a=a'$a !" !\'( >p P'( /3 !# $! >?'( =$ i+ ghh $Œ'( %-$ !$ !i"'.

T!a ?‡ ,'! %# i" $F !" !\'( SB“R >p P'( /3 !# $!a=a'$a >ƒ 0 %-$

'+# /e >\ i9# :i"' $ !L %-$ !s /…'.

e i 3+# \ E'! !%y'( +' !i"# 5#E $F !" !\'( '!% \$ e Di j'( $e'( $F

$$ :@'! >?'( /'( !‡ !%&'( ! i9# $!+‡ >\ :@'! >?'( /'( !‡ $2'( >#b De

P e'( 'ei‡ e :!#+$! 0i 5#'( >#3 ! %}'( =#39' $Œ'( >ƒ %-$ !k' ,$!.

Với '!J'( /$ ,$! =@'‡ $!%&'( '3 >ƒ %-$ =r'! D3 !a $$ /$ >#„

− H" !\'( R (![ :@'! >?'( /'( ! >p P'( /3 !# $! >?'( =$ i+.

− H" !\'( R (![ :@'! >?'( /'( ! >p P'( /3 !# $!a=a'$a.

− K+ 5#E /2 !s'( !k' ,$!.


50/87


4;2 H. )-l+, YZ ,-k +- RS+, D+, -g R} fg+, D )-= )>- RS+, )Qb> )'(

4;4;1 @ ̂ t -. )-l+,

Hr'! 4.1 S& f !" !\'( R (![ :@'! >?'( /'( ! >p P'(

/3 !# $! >?'( =$ i+.

H" !\'( R (![ :@'! >?'( >p P'( /3 !# $! >?'( =$ i+ %-$ =r'! D3

=@' !r'! 4.1. B? !L $!i !" !\'( (f/ D !C'„ /3 !‡ :@'! =#39' /3 !#. ¤


51/87


/3 !‡ (iE >p $? N :@'! PJ i"# $C' %-$ =#39' i‡ ới \$ e Di y /Ži :@'!

'!% '!#. Ži :@'! PJ i"# >ƒ %-$ i9# $!+ ới /e >?'( /'( ! :!$ '!#

%-$ (![ 0i ới '!# ># ?. T,' !i"# :+ !- %-$ >p P'( L iL# $!+ >?'(

/'( 5#'( D‘ '(#f' † >a= ! ới D%ớ$ >?'( . Q# =r'! '3 %-$ !$ !i"'

Dyi De i9# $!+ 5#'( $!~™a'Pa=. T0i k3‡ '+# >p P'( !%&'( ! i9# $!+

5#'( !i Di@' g_hSx !r !j $F ,' !i"# 5#'( SB >ƒ D (f/ !'! !C' >?'(

/'( 5#'( ‡ $$ !'! !C' Dt'( =@' !'! !C' Dt'( P%ới

'!% !r'! 4.)‡ ới C' >\ >?'( /'( ! !‹ '.

g gD

Hr'! 4.) !j $F ,' !i"# SB ới g i9# $!+ !i Di@'

gD i9# $!+ &' Di@'.

Với i"$ >p P'( !%&'( ! i9# $!+ _hSx !r !" !\'( >ƒ =y '@' :! '!03

$E/ ới E'! !%y'( $F ' >‘$ /#‡ $ Di" :!i >\ :@'! >?'( /'( ! $'( ớ'. h

?‡ L (iE/ !iL# $$ $ e'( $F ' >‘$ /# >p P'( Dt'( !2'( /e $$! !i"#5#E‡ !%&'( ! i9# $!+ 5#'( &' Di@' … %-$ 9 w#b >p P'( ='( !" !\'(

SB §8¨. {i9# '3 $? !L Pv P'( !$ !i"' Dyi De (![ i '!% !r'! 4.7


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Hr'! 4.7 i'! ! $! !%&'( ! i9# $!+ _SSx

>p P'( De i9# $!+ ™ !i $$.

T,' !i"# :+ !- >ƒ %-$ % !i $$ $k' Dl'( ới e "$! ! (iJ $!c'(

. K!i ?‡ !j $F ,' !i"# SB >ƒ $? P0'( '!% !r'! 4.)D.

S?'( /'( 5#'( /'( !a ,' !i"# >ƒ %-$ =#39' i ới :@'! =#39' >-i

5#'( &' /Pa. h >p P'( !%&'( ! i9# $!+ _SSx '@' E'! !%y'( $F ' >‘$

/# (C' '!% :!2'( '( :L. T0i /3 !#‡ ,' !i"# 5#'( =%ớ$ :!i % !PiPa

L !$ !i"' 5# =r'! $! >?'( /'( 5#'(‡ >ƒ %-$ :!#+$! 0i Dyi De `hA. h'(i"' i = † !PiPa >ƒ 5# De $!i R L !k' = '!i9# '!'! :!$ '!#. T0i /Ži

'!'!‡ ># :!i i 5# De $ !2'( PEi‡ ,' !i"# >ƒ %-$ =e' ới >?'( /'( ! %&'(

‹'( '!l/ :!2i !$ 0i PJ i"#.

4;4;2 M -~+- )A+- )Y+;

T='( !C' '3‡ $$ !%&'( =r'! ' !$ /2 E !0 e'( $F !" !\'( >ƒ %-$

=r'! D3. T† ?‡ i+' !'! !k' ,$!‡ '! (i $!b %-'( $F !" !\'(.

Với !%&'( ! i9# $!+ _SSx‡ ,' !i"# = † De i9# $!+ $!~™a'Pa= §8¨ „

g4.1


53/87


T='( ?‡ $%}'( e >?'( /'( 5#'( D‘ '(#f' † >a= !.

C' >\ >?'( /'( 5#'(.

N >\ :@'! >?'( /'( !.

,' !i"# $!#˜' !? $F :@'! >?'( /'( ! !‹ :. Với !%&'(!

i9# $!+ ASK‡ ới xSK‡ ới QSK‡

.

Di@' e $!#˜' !? $F :@'! >?'( /'( ! !‹ :. Với i9# :i"' i9#

$!+ !b‡ .

h'( 5#'( i"' >i'! = 0i /3 !# §8¨ „

g4.)

T='( ?‡ !" >\ >#3 ! =#39' P‰' (![ '\i.

!" >\ $!#3L' ji 5#'( i"' $F !PiPa.


54/87


!" >\ :!#+$! 0i $F `hA.

P'( 5#'( i"' =#'( Dr'!.

$2'( >#b =#'( Dr'! $F ,' !i"# 5#'( 0i C# $F /3 !#

i9' :!#+$! 0i.

!" >\ i9# $!+ %-$ $!#˜' !?.

• T,' !i"# 5#'( i"' !i"# P'( $F :@'! !‹ : §8¨ „

g4.7

h !a !%&'( =r'! g4.) $? !L '!\ !0'( !‹ '!b >?'(

/'( 5#'( !'! !C' >\ !0'( !‹ !i ,' !i"# SB. h ?‡ L f' 0i (i =€

$F !r . g4.4

{i9# :i"' g4.4 $? d '(!› = (iới !0' >\ %-'( :@'! >?'( /'( ! $? !L >p P'(

='( !" !\'(.

T='( /3 !# i9' :!#+$! 0i‡ '!iv# ,' !i"# | AS` %-$ wa/ '!iv# =ei‡

'(#3@' '!k' =$ i+ E'! !%y'( '( :L +' $!b %-'( $F !" !\'(. T=%ớ$ i@'‡

w[ /


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56/87


Với $2'( >#b '!iv# j'( §8¨ „

g4.8

Vr ‡ '@' g4.

T='( ?‡ e =e'( !j $F ,' !i"# PEi '9'. V %-$ ,'! $! !i Dt'( w#'(

5#'! C' >\ R.

T0i De (iEi i9# $!+ R‡ %-$ =e' :+ !- ới P e'( 'ei . Với

i"$ $ Ds $$ !'! !C' $ C' g) ‡ ,' !i"# ># :!i (iEi i9# $!+ „

g4.1

GiE >p =l'( !" >\ :!#+$! 0i $F `hA ‡ :!i ? $? SNR „

g4.11

{\i ới !%&'( ! i9# $!+ xSK‡ ‡ !" >\ !˜/ $!b Q $F /3

!# %-$ ,'! §8¨ „


57/87


58/87


z%# d‡ † i9# :i"' $F DiL# !‹$ g4.4‡ :!i >\ :@'! >?'( /'( ! t'( @' ‡ !r

!" >\ i9# $!+ $F /Ži :@'! !Ei %-$ (iE/ w#\'(. GiE >p $? /e !" >\ i9# $!+

f'( '!b (iJ $$ :@'! !r . N(i =‡ ='( !" !\'( >p P'( /… NR™‡

Dt'( !2'( i"' $! /Ži :@'! 0i /3 !# >ƒ ‡ ới x \$ e Di

j'( $e'( $F $$ :@'! >?'( /'( !.

4;3 H. )-l+, YZ ,-k +- RS+, D+, -g R} fg+, D )-= >Y-oQo+>o

4;3;1 @ ̂ t -. )-l+,

S& f !" !\'( R (![ :@'! >?'( /'( ! >p P'( /3 !# $!a=a'$a %-$

=r'! D3 =@' !r'! 4.4. T%&'( '!% !" !\'( >p P'( /3 !# $! >?'( =$ i+‡ !"!\'( >p P'( /3 !# $!a=a'$a $Œ'( %-$ $!i / D !C' „ /3 !‡ :@'! =#39'

/3 !#. V9 /3 ! :@'! =#39' $F !" !\'( y !r'! 4.4 !' ' (i\'( ới

!" !\'( >p P'( /3 !# $!a=a'$a y !r'! 4.1. S :!$ Di" $!” 'l/ y /3 !#. T,'

!i"# 5#'( +' /3 !# >ƒ %-$ :!#+$! 0i Dyi `hA. S# ?‡ ,' !i"# '3 >ƒ %-$

=e' ới '! >'( † De P e'( 'ei Dyi De (![ i $#a= . T,' !i"# :+

!- >ƒ %-$ $!i !'! !i !C' ới e "$! 5# $F !'! !C' $? ='( /Ži !C'


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. Hi !C' '3 >ƒ %-$ % +' !i !PiPa $? $‚'( !" >\ 5#'( i"'.

h'( ,' !i"# i = † De $! >?'( $k' Dl'( >ƒ %-$ 0 = ># :!i !$ !i"' 5# =r'!=† !i P'( 5#'( i"' D‘ '(#f' † !i !PiPa. xe $!i R >ƒ > $![ ,' !i"#

'3 = '!i9# '!'! :!$ '!#. Vi"$ $!' :@'! !# %-$ !$ !i"' Dl'( $$! =e' ới

C' >\ >?'( /'( ! %&'( ‹'(. xe $ Dt'( !2'( PEi %-$ >p P#'( L $ Ds '!iv#

(iJ 0i PJ i"# $? ,$!.


60/87


Hr'! 4.4 S& f !" !\'( R (![ :@'! >?'( /'( ! >p P'(

/3 !# $!a=a'$a.

4;3;2 M -~+- )A+- )Y+

T%&'( '!% !" !\'( >p P'( /3 !# $! >?'( =$ i+‡ ,' !i"# 0i C# = $F De

i9# $!+ $! | ™a'Pa= „

g4.1

S?'( i@' $ ! = † De P e'( 'ei %-$ $!#˜' D€ >¬' y /3 !# „

g4.16

T='( ?‡ Di@' e >?'( i@' $ $F De P e'( 'ei.

C' >\ 5#'( $F De P e'( 'ei.

GiE >p ,' !i"# 5#'( +' ,' !i"# P e'( 'ei %-$ !\i !- !k' $$‡ i"'

=@' !i !PiPa C' %- „

g4.1M

g4.18

T='( ?‡ !" >\ >#3 ! %}'( =#39' (![ '\i g .

G !" >\ :!#+$! 0i 5#'( $F De `hA.


61/87


62/87


T!'! !C' D€ 0i Ds r De $! >?'( 5#'( :!2'( ‹'( $$ C' >\ '3.

h ? „

g4.))

ới .

Ti+ $ Di+' ji >\ !0'( !‹ !i„

h !'! !C' D€ 0i Ds '@' „

g4.)7


63/87


T† DiL# !‹$ g4.)) g4.)7‡ P'( ='( DiL# !‹$ g4.)1 %-$ i+ i+

!'!„

g4.)4

{L > >'! !i"# 't'( $F !i !" !\'( >p P'( !i 0i /3 !# y =@' ới $$ i9#

:i"' '!% '!#‡ !%&'( ! $! >?'( !/P3'a %-$ 9 w#b >p P'(. K!i ? ‡

. xiL# !‹$ g4.)4 %-$ i+ 0i !'! „

g4.)

{L (i =€ $F f' 0i ='( !$ +‡ i9# :i"' ># k3 !Ei %-$ !s /…'„

g4.)6

GiE >p $? $‚'( /e !" >\ i9# $!+ $! b $E $$ :@'! >?'( /'( !‡ :!i ?

T,' !i"# 5#'( i"' !i"# P'( $F :@'! !‹ : „


64/87


g4.)M

T='( ?‡ $2'( >#b =#'( Dr'! $F ,' !i"# 5#'( +' /3 !#‡

$2'( >#b =#'( Dr'! $F >?'( P e'( 'ei.

T='( !" !\'( >p P'( /3 !# $!a=a'$a‡ D@' $0'! '!iv# ,' !i"# | AS`‡ '!iv#

P e'( 'ei | AS` $Œ'( %-$ wa/ '(#f' '!iv# $!,'! E'! !%y'( $!b %-'( $F !"!\'(. Sp P'( !%&'( ! %ớ$ %-'( '!iv# G#>>i'‡ /\ ® %&'( ‹'( ới (iE !#3+ ,' !i"# &' $$ !" >\ ) ‹'( =%ớ$ w#b

! † i"$ '!iv# AS` 'l/ y !i Dt'(‡ \i w‹'( '!# 5# C' >\ >?'( /'( 5#'(.


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g4.71

B2'( >#b '!iv# j'( „

g4.7)

Vr '@' g4.77

T='( ?‡ e =e'( !j $F ,' !i"# PEi '9'. V %-$ ,'! $! !i Dt'( w#'(

5#'! C' >\ R.

T0i De (iEi i9# $!+ R‡ %-$ =e' :+ !- ới !'! !C' P e'( 'ei

. Với i"$ $ Ds $$ !'! !C' $ C' g) ‡ ,' !i"# ># :!i (iEi i9#

$!+ „

g4.74

T!2'( !%}'( ‡ DiL# !‹$ ,'! SNR $! :@'! >?'( /'( ! !‹ : „

g4.7

T%&'( '!% !" !\'( >p P'( /3 !# $! >?'( =$ i+‡ !" >\ !˜/ $!b Q $F

/3 !# %-$ ,'! $! :@'! >?'( /'( ! !‹ : „

g4.76

Với \i ới ASK‡ \i ới xSK \i ới QSK.


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{L 0 %-$ g%&'( %&'( ới ‡ $2'( >#b \i !iL# $F ,' !i"#

5#'( 0i C# /3 !# %-$ w$ €'! † DiL# !‹$ g4.76. Gi =€ '3 !%}'( %-$

(i e '!03 !# „

g4.7M

{L !" !\'( >p P'( /3 !# $!a=a'$a $? !i"# >#b \ !&' > ới !" !\'( >p P'(

/3 !# $! >?'( =$ i+‡ i9# :i"' ># k3 !Ei %-$ !s /…'„

g4.78

xiL# !‹$ g4.78 $!” f' 0i :!i .


67/87


K+ #?'( =$ i+‡ /e !/ >\ %-$ (i e t'( e '!03 !#

gGi' i' =a$aia= >a'>iii3 %-$ 9 >#b >p P'(. N? %-$ €'! '(!› Š >\ (iJ

!i e '!03 $F !i 0i /3 !# > $! $!c'( $? $‚'( \$ e Di $‚'( Š " Di Ži

x`R. xiL# !‹$ ' !$ $F '? '!% >#„

4;4 K() J=W D -€+, F -x+ )A>-

T='( /$ '3‡ $$ DiL# !‹$ g4.7M g4.7 >ƒ %-$ >p P'( L !k' ,$! !i"#

't'( $F !" !\'( >p P'( /3 !# $!a=a'$a. e > > >'! $Œ'( >ƒ %-$ !$ !i"'(iJ !" !\'( '3 ới !" !\'( >p P'( /3 !# $! >?'( =$ i+.


68/87


{L i+' !'! :!E >‡ $$ !2'( >\ ># k3 >ƒ %-$ 5#3 €'! $!#'( $! ' De

$$ =%}'( !-‡ D (f/ „ D%ớ$ >?'( $F >?'( /'( 5#'( ž ‡ !" >\

i9# $!+ $!#˜' !? ‡ !" >\ '!iv# $F `hA . Tb $E $$

=%}'( !- P%ới k3 9# >p P'( D !%&'( ! i9# $!+ ASK‡ xSK QSK.

H" !\'( >p P'( :iL# /… !? NR™‡ '@' Dt'( !2'( i"' $F ,' !i"# PEi '9' y /3

!# >ƒ .

4;4;1 K-WY R) Dl' J=+ -. ,'] ^s +-E )-= F >+, R=p) s fY ^s+, +s'


69/87


-18 -16 -14 -12 -10 -8 -6 -4 -2 0-40

-35

-30

-25

-20

-15

PLo(power of local osccilator [dBm])

P i n ( R e c e i v e r S e n s i t i v i t y [ d B m ] )

ASK using Coherence Detection

BPSK using Coherence DetectionQPSK using Coherence Detection

Hr'! 4. {f !€ DiL# Piv' /\i 5#' !" (iJ e '!03 !# $2'( >#b De P e'( 'ei$! =%}'( !- N ž 4 ới G ž )‡ .

\i 5#' !" (iJ e '!03 !# $2'( >#b $F De P e'( 'ei :!E >

P =@' DiL# !‹$ g4.7M. *[ =%}'( !- N ž 4‡ ới (i =€ 'l/ ='( :!E'( †

+' ‡ $? f !€ DiL# Piv' /\i 5#'( !" (iJ '!% !r'!

ƒ 4. =@' k3. Với G ž ) ‡ !" >\ >#3 ! \$ e Di j'( $e'(

.


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T† !r'! 4.‡ '! ới !i !%&'( ! $' 0i‡ !b '!b xSK. T#3 '!i@'‡ >ƒ 0 +' =0'(

!i j' €'! $? (i =€ :!2'( ji ới F ớ'‡ (i =€ '3 :!$ '!# ới †'(

!%&'( ! i9# $!+. V, P '!% ='( =%}'( !- '3‡ >ƒ 0 =0'( !i j' €'!

:!i ới !%&'( ! i9# $!+ ASK ới QSK‡ xSK C' %-

‡ .

4;4;2 K-WY R) Dl' J=+ -. ,'] ^s +-E )-= F Rl +- RS+, D+, -g

\i 5#' !" (iJ e '!03 !# >\ :@'! >?'( /'( ! N %-$ :!E >

P =@' DiL# !‹$ g4.7M. \i 5#' !" '3 $!€# > $ e'( $F $$ !/ >\ '!% e

:!#+$! 0i 5#'( G $F `hA‡ !" >\ >#3 ! %}'( =#39' \$ e Di j'( $e'( .

Hr'! 4.6 f !€ DiL# Piv' /\i 5#' !" (iJ N‡ ới $! $$ =%}'( !-


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$‚'( \$ e Di j'( $e'( . Hr'! 4.M f !€ DiL# Piv'

/\i 5#' !" (iJ N‡ ới $! $$ =%}'( !- $‚'(

\$ e Di j'( $e'( .

N(i =‡ † /$ 4.4.1 y =@'‡ '!


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2 6 10 14 18 22 26 30 32-50

-45

-40

-35

-30

N (number of subcarrier)

P i n [ d B m ] ( R e c e i v e r S e n s i t i v i t y )

ASK using Coherence Detection with G = 15

BPSK using Coherence Detection with G = 15

QPSK using Coherence Detection with G = 15




Hr'! 4.6 {f !€ DiL# Piv' /\i 5#' !" (iJ N‡ ới

$! $$ =%}'( !- $‚'( \$ e Di j'( $e'( .

N!% %-$ =r'! D3 =@' !r'! 4.6‡ ới $‚'( /e !%&'( ! i9# $!+‡ =%}'(

!- G ž 1 $! e '!03 !# ớ' !&' > ới =%}'( !- G ž ). B!‹'( s‡ Š "

'(!€$! ới e :!#+$! 0i G. xl'( $$! 'k'( $ e :!#+$! 0i $F `hA !i"# 't'(

$F !" !\'( >ƒ t'( @' '( :L.

Ti+ !a ‡ $!c'( !…3 :!E > /\i 5#' !" (iJ N P%ới E'! !%y'( $F

> >#3 ! =#39' P‰' (![ '\i Dl'( , P ='( !r'! 4.M %-$ =r'! D3 P%ới k3.


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T† !r'! 4.M‡ '! ới =%}'( !- . B!‹'( s‡ :!i $? > >#3

! $'( ớ' !r e '!03 !# !Ei t'( @' L E/ DE $!b %-'( !" !\'(.

2 6 10 14 18 22 26 30 32-50

-48

-46

-44

-42

-40

-38

-36

-34

-32

-30

-28


P i n [ d B m ] ( R e c e i v e r S e n s i t i v

i t y )

ASK using Coherence Detection with n = 0.8

BPSK using Coherence Detection with n = 0.8

QPSK using Coherence Detection with n = 0.8

ASK using Coherence Detection with n = 0.6

BPSK using Coherence Detection with n = 0.6

QPSK using Coherence Detection with n = 0.6

Hr'! 4.M {f !€ DiL# Piv' /\i 5#' !" (iJ N‡ ới

$! $$ =%}'( !- $‚'( \$ e Di j'( $e'( .


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0 5 10 15 20 25 30 35-50

-45

-40

-35

-30

-25


P i n [ d B m

] ( R e c e i v e r S e n s i t i v i t y

)

ASK using Coherence Detection with B = 10Gb/s

BPSK using Coherence Detection with B = 10Gb/s

QPSK using Coherence Detection with B = 10Gb/s




B#\i $‚'( ‡ $!c'( !…3 :!E > /\i 5#' !" (iJ N P%ới E'! !%y'( $F

\$ e Di j'( $e'( gx Dl'( , P ='( !r'! 4.8 %-$ =r'! D3 y =@'. T!a ?‡

'!#b !" !\'( Dyi $$ !2'( >\ $

e'( '!% e :!#+$! 0i‡ !" >\ >#3 ! =#39' P‰' \$ e Di j'( $e'(. T='( !C'

'3‡ > > >'! !i"# >#b $F /3 !# $!a=a'$a /3 !# =$ i+ %-$ >p P'(='( !" !\'( >ƒ %-$ =r'! D3. T!a '!% :+ #p P'(

Hr'! 4.8 {f !€ DiL# Piv' /\i 5#' !" (iJ N‡ ới ‡

$! $$ =%}'( !- $‚'( !" >\ >#3 ! .


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/3 !# $!a=a'$a !i"# 5#E !&' > ới /3 !# $! >?'( =$ i+ !r !i i9# :i"'

DiL# !‹$ g4.78 !Ei %-$ !s /…'.

S > >'! >ƒ P =@' e '!03 !# $F /3 !# $! >?'( =$ i+‡ %-$ w$ €'!

Dyi DiL# !‹$ g4.14 DiL# !‹$ g4.7M \i ới !" !\'( >p P'( /3 !# $!a=a'$a.

Với G ž )‡ \$ e Di j'( $e'( ‡ $? f !€ %-$ =r'!

D3 =@' !r'! 4. P%ới k3. z%# d =l'(‡ ới $$ !/ >\ ='( , P '3‡ $$ i9# :i"'

L !" !\'( >p P'( /3 !# $!a=a$' \ !&' /3 !# $! >?'( =$ i+ … %-$

!s /…'.

N!% %-$ =r'! D3 =@' !r'! 4.‡ $? !L !b3 =l'( ới $‚'( /e !%&'( !

i9# $!+‡ !" !\'( >p P'( /3 !# $!a=a'$a $? !L 0 %-$ e '!03 !# !b !&' >

ới !" !\'( >p P'( /3 !# $! >?'( =$ i+ ới $$ i9# :i"' y =@' %-$ !s

/…'. T#3 '!i@'‡ y , P !r'! 4.1‡ :!i / i9# :i"' :!2'( %-$ !s /…'‡ !"

!\'( >p P'( /3 !# $!a=a'$a $! !i"# >#b !b !&'. T $C' t'( G !$ =c '(‘'

:!E'( $$! =#39' P‰' g'+# $? !L L i9# :i"' =@' %-$ !s /…'.


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0 5 10 15 20 25 30 35-50

-45

-40

-35

-30

-25

-20

-15

N (number of subcarrier channels)

P i n

( R e c e i v e r S e n s i t i v i t y

d B m

)


BPSK using Coherence Detection

QPSK using Coherence Detection

ASK using Direct Detection

BPSK using Direct Detection

QPSK using Direct Detection

Hr'! 4. {f !€ DiL# Piv' /\i 5#' !" (iJ N‡ ới $! $$ =%}'( !-

\$ e Di j'( $e'( $F !i !" !\'( >p P'( /3 !# $!

>?'( =$ i+ /3 !# $! >?'( $!a=a'$a.


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Hr'! 4.1 {f !€ DiL# Piv' /\i 5#' !" (iJ N‡ ới $! $$ =%}'( !-

\$ e Di j'( $e'( $F !i !" !\'( >p P'( /3 !# $!


0 5 10 15 20 25 30 35-35

-30

-25

-20

-15

-10

N (number of subcarrier channels)

P i n

( R e c e i v e r S e n s i t i v i t y

d B m

)


BPSK using Coherence Detection

QPSK using Coherence Detection

ASK using Direct Detection

BPSK using Direct Detection

QPSK using Direct Detection

T=@' k3 … $!” = =l'(‡ :!i $$ i9# :i"' … %-$ !s /…' !r !" !\'( >p P'(

/3 !# $!a=a'$a >ƒ $! e '!03 !# !b !&'. T#3 '!i@'‡ L !iL# =š !&' i"$ t'(

!i"# 5#E 9 e '!03 !# (iJ !i !" !\'(‡ '? ! !#e$ '!J'( 3+# \ '‡ !r

!" >\ %-$ €'! '(!› ='( DiL# !‹$ g4.7 >ƒ %-$ >p P'( L !k' ,$!

b' 9 '3.

4;4;4 Ml' J=+ -. ,'] ^s )+, ^s +-E )-= F >+, R=p) >X s fY ^s+, +s'

\i 5#' !" (iJ $2'( >#b De P e'( 'ei >ƒ %-$ :!E >

P =@' $$ '!k' \ E'! !%y'( +' '? D (f/ „ e :!#+$! 0i 5#'( $F `hA‡ !"

>\ >#3 ! %}'( =#39' (![ '\i‡ \$ e Di j'( $e'( >\ :@'! >?'( /'( !.

4;4;4;1 b W+- -?‚+, >X ^s -=(>- ^E' J=+, F -. Rl R= -Y


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S E'! !%y'( $F +' /\i 5#' !" (iJ >ƒ %&$ :!E >

!2'( 5# , P P%ới k3.

-15 -10 -5 0 5-12

-10

-8

-6

-4

-2

0

2

4

6

8

PLo[dBm](power of local osccilator)

G R [ d B ] ( G a i n i n R e c e

i v e r S e n s i t i v i t y )







Hr'! 4.11 f !€ DiL# Piv' /\i 5#' !" (iJ ‡ ới ‡

$! $$ =%}'( !- $‚'( >\ :@'! >?'( /'( ! . T '!ƒ t'(

@' !a > t'( $F $2'( >#b De P e'( 'ei. ¤ , P '3‡ i9# :i"' … %-$

Hr'! 4.11 {f !€ DiL# Piv' /\i 5#' !" (iJ ‡ ới ‡

$! $$ =%}'( !- $‚'( >\ :@'! >?'( /'( ! .


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!s /…'‡ #3 '!i@' :!i DiL# !‹$ g4.78 ới (i =€ !b !r !" !\'( >p P'( /3

!# $!a=a'$a :!2'( 0 %-$ > 'k'( $ e !i"# 5#E e '!03 !# '!% /'( -i. K!i

?‡ $? (i =€ k/ '!% !r'! ƒ. {+' :!i F ớ' L !s /…' DiL# !‹$

g4.78 !r >ƒ $? (i =€ P%&'( '!% !r'! ƒ‡ ‹$ > 'k'( $ !i"# 5#E e '!03

!# $F !" !\'( >p P'( /3 !# $!a=a'$a … !'! $2'(. T#3 '!i@'‡ > 'k'( $

'3 :!2'( !Ei 2 ƒ 0 +' (i =€ j' €'!‡

ớ' '!b / !" !\'( $? !L 0 %-$. Gi =€ '3 ‚3 !#e$ e :!#+$! 0i

5#'( G !" >\ >#3 ! ‡ $ !L !&' ! !#e$ ,$! >\ . N!% ='( , P

'3‡ ới $\ €'!‡ (i =€ G :!$ '!# !r ,$! >\ $Œ'( :!$ '!#.

4;4;4;2 b W+- -?‚+, >X )l> ^s ') )w+, >s+, >X >> +- RS+, D+, -g

S E'! !%y'( $F \$ e Di j'( $e'( $F $$ :@'! >?'( /'( ! +' /\i 5#'

!" (iJ >ƒ %&$ :!E > !2'( 5# , P P%ới k3.


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Hr'! 4.11 {f !€ DiL# Piv' /\i 5#' !" (iJ ‡ ới ‡

$! $$ =%}'( !- $‚'( >\ :@'! >?'( /'(

! . B? !L '!#b P e'( 'ei > ới $$ !2'( >\ :!$ +' (i =€ $F .


81/87


-15 -10 -5 0 512.4

12.6

12.8

13

13.2

13.4

13.6

13.8

14

PLo[dBm] (power of local osccilator)

G R [ d B ] ( G a

i n i n R e c e i v e r S e n s i t i v i t y )

ASK using Coherence Detection with B = 10Gb/sBPSK using Coherence Detection with B = 10Gb/s





Hr'! 4.1) {f !€ DiL# Piv' /\i 5#' !" (iJ ‡ ới ‡

$! $$ =%}'( !- $‚'( >\ :@'! >?'( /'( !

4;4;4;3 b W+- -?‚+, >X Rl i?B+, >> +- RS+, D+, -g

S E'! !%y'( $F \$ e Di j'( $e'( $F $$ :@'! >?'( /'( ! +' /\i 5#'

!" (iJ >ƒ %-$ :!E > !2'( 5# , P P%ới k3.


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Hr'! 4.1) {f !€ DiL# Piv' /\i 5#' !" (iJ ‡ ới ‡

$! $$ =%}'( !- $‚'( \$ e Di j'( $e'(

.

-15 -10 -5 0 510.5

11

11.5

12

12.5

13

13.5

14

PLo[dBm] (power of local osccilltor)

G R [ d B ] ( G a i n i n R e c e i v e r S e n s i t i v i t y

ASK using Coherence Detection with N = 4

BPSK using Coherence Detection with N = 4

QPSK using Coherence Detection with N = 4

ASK using Coherence Detection with N = 12

BPSK using Coherence Detection with N = 12

QPSK using Coherence Detection with N = 12


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Hr'! 4.17 {f !€ DiL# Piv' /\i 5#' !" (iJ ‡ ới ‡

$! $$ =%}'( !- $‚'( \$ e Di j'( $e'( .

T%&'( '!% \i ới =%}'( !- y /$ 4.4.4.)‡ ới $‚'( /e !%&'( ! i9#

$!+‡ >ƒ t'( !a > t'( $F . T='( =%}'( !- $? $‚'( >\ :@'! >?'(

/'( ! !r !%&'( ! i9# $!+ xSK $! :+ 5#E \ !&' ASK QSK. H"

!\'( $Œ'( >ƒ 0 (i =€ j' €'! ớ' '!b :!i F ớ'. V (i =€

'3 :!2'( ! !#e$ !%&'( ! i9# $!+ !3 >\ :@'! %-$ (![. {i9# '3

%-$ (iEi !,$! P =@' > E'! !%y'( %- =ei $F $2'( >#b P e'( 'ei > ới $$

!2'( >\ :!$ +' (i =€ $F . h‰' +' e t'( e '!03 !# $!” ! !#e$

,$! >\ (iJ e :!#+$! 0i 5#'( $F `hA !" >\ >#3 ! =#39' P‰'‡ (![ '\i.

4;\ K() i=+ >-?@+,

T=@' k3 … =r'! D3 $!i i+ i"$ !k' ,$! !" !\'( R (![ :@'! SB >p

P'( /3 !# $!a=a'$a. N(i = $' $? > !k' ,$!‡ > >'! ới !" !\'( >p P'(

/3 !# $! >?'( =$ i+ L '! (i ,'! !i"# 5#E 9 e '!03 !# $F !" !\'( >p

P'( /3 !# $!a=a'$a. B$ >& f !" !\'( $$ /2 !r'! ,'! ' L !k' ,$!

$Œ'( … %-$ =r'! D3. Q# ?‡ /e >\ '!#„

− V9 / $b# =c$ /3 !#‡ !" !\'( >p P'( /3 !# $!a=a'$a $? $b# =c$ !‹$

0 !&' > ới /3 !# $! >?'( =$ i+.


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− T#3 '!i@'‡ !" !\'( >p P'( /3 !# $!a=a'$a $? !L $! ![ 0 %-$ e

'!03 !# \ !&' > ới /3 !# $! >?'( =$ i+ ới $‚'( $!b %-'(‡ '+# $$ i9#

:i"' :/ !a '!% … =r'! D3 y =@' %-$ !s /…'.

− B? '!i9# !/ >\ E'! !%y'( ới $!b %-'( !" !\'( >p P'( /3 !#

$!a=a'$a '!% $2'( >#b De P e'( 'ei‡ e :!#+$! 0i 5#'(‡ !" >\ >#3 !‡ \$ e

Di‡ >\ :@'! >?'( /'( !. T='( ?‡ $2'( >#b De P e'( 'ei‡ e :!#+$! 0i 5#'(

> >#3 ! =#39' P‰' '!J'( 3+# \ E'! !%y'( ớ' '!b +' (iới !0' !i"# 5#E 9

e '!03 !# (iJ !i !" !\'( >p P'( !i 0i /3 !# =@'.

− T,'! !i"# 5#E $F !" !\'( >p P'( /3 !# $!a=a'$a > ới /3 !# $!

>?'( =$ i+ :!2'( !Ei 2 ?'( /'( ! $'( t'( !r e '!03 !# 3@# $C# L E/ DE $!b

%-'( !" !\'( !Ei t'( @'‡ '(#3@' '!k' P > >#3 (iE/ $F !" >\ i9# $!+ $!#˜'

!? . {i9# '3 = > (iới !0' 9 >\ :@'! >?'( /'( ! %-$ >p P'( ='( !"

!\'( SB. h ?‡ !$ + … = 3@# $C# 9 > :+ !- (iJ SB :; !#


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KẾT LUẬN VÀ HƯỚNG PHÁT TI!N Đ" TÀI

$; K() i=+

{f ' … !$ !i"' =r'! D3 d !#3+ $& DE' 9 $$ :; !#-i 5#'( gR‡ :; !#-i

5#'(‡ !" !\'( R >ƒ %-$ ‹'( P'( =e'( =…i ='( %&'( i‡ !3 !+ PC' $$ !"

!\'( >p P'( $ :i/ 0i =#39' !\'(.

− Với > !%&'( /0i !? '!} !" !\'( BATV‡ $$ !i+ D€ !$ $! :;

!#p P'( /3 !# $!a=a'$a > ới !"

!\'( >p P'( /3 !# $! >?'( =$ i+ $!” 0 %-$ :!i $$ i9# :i"' :/ !a

%-$ !s /…'‡ … %-$ =r'! D3 ='( $!%&'( 4.


86/87

− B$ 3+# \ $ e'( +' e '!03 !# '!% $2'( >#b De P e'( 'ei‡ e :!#+$!

0i 5#'(‡ !" >\ >#3 ! =#39' P‰' (![ '\i‡ >\ :@'! \$ e Di j'( $e'( $F

$$ :@'! >?'( /'( ! !Ei %-$ r/ !iL#‡ :!E > :; %—'( L i9# $!”'! $! !‚!- ='( †'( i9# :i"' $ !L.

/; H?# k3 %-$ 9 w#b L i+ $ ! =iL' L i '!% ># „

− K!E > !@/ $$ !%&'( ! i9# $!+ :!$ '!% | QA.

− K!E > ới $$ :iL# /… !? :!$ '!#.

− O'( P'( $$ De `hA !" !\'( L 'k'( $ :!E 't'( =#39' P‰'.

− K+ !- ới :; !#p P'( Dt'( !2'(

5#'(.

− N(!i@' $‹# :!E 't'( 'k'( $ $!b %-'( !" !\'( Dl'( $$! >p P'( :; !#


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T&! '!ệu tham kh

phan tich he thong rof ghep kenh song mang phu su dung may thu coherence

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