Đi Sâu Phân Tích Điều Chế Số Qpsk

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    MC LC :

    LI M U3

    CHNG I. TNG QUAN V L THUYT IU CH S TN HIU

    1.1.GII THIU V IU CH S.4

    1.1.1.S khi ca mt h thng thng tin s in hnh...4

    1.1.2.M hnh cho h thng thng tin s cho b iu ch ! gi"i iu ch....6

    1.1.#.$%c &h'ng t(u)n *+n s ...7

    1.2. TNG QUAN V TRNH T IU CH S.9

    1.. C!C "HNG "H!" IU CH C #$N...13

    1.#.1. ,h-a *ch bi/n 0S,m&3itu*4 Shi5t ,4)ing613

    1.#.2 ,h-a *ch t7n s 08S,8(49u4nc) Shi5t ,4)ing616

    1.#.#. ,h-a *ch &ha 0:S,:has4 Shi5t ,4)ing6..18

    1.#.;.

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    2.F.1. M t" @iu ch

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    LI M U

    C h !h- !h- !i- hi- &- h! !/i- /! ';-h '< !/=- !*$- !h i>i v$

    ? !h&@ !h hAu h! h !h- !h- !i- !+,- !B. - -$@ $- !! h,--hD- -hu Au vE h! %+F- GHh vJ B h*- h & GHh vJ h; i !h$-hJ

    i! %$ %+F- !hu= &* &- !N- -h&-h -h$ -hi=- u ? G- /!

    -hiEu (O !huP! v$ 'Q! !/*- R %$ (O !huP! iEu h . M GS R -hiEu h+,-

    !h iEu h J -h+- vi hT- !h h+,- !h iEu h -$@ h @u !uV

    !huQ v$* G;- (iu iEu h v$ !h R-.

    hiu /W h,- vE %*;i iEu h X- -h+ h !h h*;! Q- & %*;i

    iEu h i! %$ iEu h (hR& GHh h& Y h&i- Zhi[! K\@i- ] -=- \' ? h^-

    E !$i _ BD EF JF JKJ EFM EFKE OPD JF B B FWX JF EFX

    "S/ . Z&u 'Q! !hai i&- !' hiu v$ S- v>i B h+>- Gb- & !hA@ i* !/*-

    !c Q '- v$ !hA@ i* #Z. L= du e+F- !/B !i h+>- Gb-J - -&@ \' ?

    h*$- !h$-h f - -$@ v>i -Qi Gu- f' & h+,-:

    g Ch+,- I: #c- u&- vE % !hu@! iEu h !- hiu

    g Ch+,- II: i Tu hT- !h %*;i iEu h (hR& GHh h& ZK

    g Ch+,- III: M hj- 'Q! %*;i iEu h (hR& Gih h&k' li- $@ !j %m- )' ,- !>i !hA@ i* ? i n \' R !h h*$-

    !h$-h f - !! -hi -$@.

    Hi Phng, ngy 22 thng 1 nm 2011

    Sinh vin* "FZ V[ -\

    3

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    CHNG I. TNG QUAN V "HNG "H!" IU CH

    TN HIU S

    #/*- h+,- -$@ \' !/-h $@ , %+F vE v&i !/m & iEu h !/*- 'Q! h

    !h- !h- !i- i- h-hJ %*;i iEu h , )-J v$ !i=u huo- %B& h^- !/-h!B iEu h.

    1.1 GII THIU V IU CH S

    1.1.1 S khi h thng thng tin s in h!nh.

    Z* -h !h- !i- v$ !h- !i- !+,- !B

    !/+- , )- & h !h- !h- !i- J GS %$ !/u@E- Gb- N- h&@ N-

    (=-hJ R %$: !- hiu +F !/u@E- Gb- v$ lp % %$ !- hiu . R X- %$ !/+- hT- i! h !h- !h- !i- v$ h !h- !h- !i- !+,- !B.

    #- hiu !+,- !B R !h -hP- v i !/HJ % A@ 'Q! G)i -$* R. e G i-

    h-h & !- hiu !+,- !B %$ !- hiu q %i /& & 'Q! 'i/*J h-h %$ Gm- i- H

    iEu h i=- Q qi !i- -Ri -+ai p G-. r+F %;iJ !- hiu -hP- i !/H

    !/*- 'Q! !P hDu h;- i !/H. e G i- h-h & !- hiu %$ !- hiu %i /&

    & 'Q! '@ !-hJ R %$ husi i!.

    #h- !i- R -hD- +u i' , )- * v>i !h- !i- !+,- !B R %$:g #- hiu R (h) -N- h- -hitu !! h,- !- hiu !+,- !B: #h

    -h!J !h&' '&- !i- & !- hiu h -' !/*- 'Q! !P hDu h;- i !/H

    v$ ! h,- !h&' & !- hiu !+,- !B. #h h&iJ !- hiu u- (h) -N-

    p& %si hiu u): !; T' (h- !h %X@ u& Q %J v$ %si !/u@E- Gb- R !h

    +F p& %;i 'Q! h hiu u) -ha h+,- !h iEu (hi- %siJ (O !huP! '?

    hR& p& &i.

    g wu- %+F- h !h- !h- !i- X- %>- h,- h !h- !h-!i- !+,- !B -ha (O !huP! '? hR& -uf-J hx (=-h J (O !huP! & !/u@

    -hP !y R (h&i !h hiu u) +a- !/u@E-.

    g z- !*$- !h- !i- +F )' )* -ha p G- '? hR& Y'? 'P!].

    g e$ ';h !+,- i /{J -ha B h! !/i- & - -h

    ';h !h hFJ ';h -$@ $- hi' +u !h * v>i ';h !+,- !BJ ) vE i

    !h$-hJ h -N-

    #u@ -hi=-J #h- !i- X- R -hD- -h+F i' & -R:

    4

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    g |=u Au f- Q %$ (hR (hN- %>- -h! !/*- h*;! Q- & 'Q! h

    !h- !h- !i- J !y f- Q !A- YR- '&-]J f- Q (hu-J f- Q @'*%

    - f- Q i! Yf- Q f- hf]. R X- %$ !hh !h %>- -h! (hi !/i- (h&i

    - -h !h- !i- '>iJ -h! %$ i v>i !h- !i- (h- GT@ -,i hHu )-h

    h+q- -- -E & 'i !/+a- !/u@E- R-.

    g #h- !i- X- @=u Au N- !h- !/u@E- Gb- %>- h,-J !! -hi=-

    iEu -$@ (h- v}-h vit- -. e GJ !- hiu !h*;i !+,- !B @=u Au N- !h-

    !/u@E- Gb- !i !hiu (h*)- 3(~ Y300~g3400~]J -h+- vb- -uf- !i- -$@ +F

    hR& CM Y! Q i! %i /& 64(] !h N- !h- !/u@E- Gb- !i !hiu h* !-

    hiu -$@ %$ 64(~ Y h,- 20 %A- !/+a- hF !/=-]. #u@ -hi=-J -u -uf- R +F

    hR& !h\* (O !huP! zwCM Y! Q %i /& !h\* huo- .721gI#U %$ 32(] !h

    N- !h- !i !hiu h m- 'Q! -p&J h&@ '? hR& !h*;i !/*- h !h- v !u@-!c *-J h !h- v !i-h ! Q i! lu- h m- n v$i ( ! %$ N- !h-

    @=u Au l l h* !hP' h -hj h,- * v>i !- hiu !+,- !B. M! (hJ (O

    !huP! iEu h & ' h- h;- MgdzMJ MgZK h&@ (O !huP! hx (=-h

    wM X- 'q /& h@ v^- !/*- !+,- %&i (h- l& h !h- !h- !i- < p

    G- hc !A- hiu u) h,- !h- !i- !+,- !B.

    rhD- +u i' & !h- !i- R -h}& u&- !/^- h,- -h+F i' &

    -RJ v vP@ h !h- !h- !i- -$@ $- !/q -=- !h- G-. #/*- !+,- %&i(h- l&J ';- vit- !h- < h*$- !*$- hR&.

    ~-h 1.1 %$ , f (hi & 'Q! h !h- !h- !i- i- h-h. #h- !i- R

    !h +F pi i !y 'Q! -uf- !+,- !B h&@ !y 'Q! -uf- . Q hu@- ci !+,-

    !Bg Yzw] %@ 'bu v$ %+F- !p hR& !- hiu !+,- !B v$ iu Git- 'bu G+>i

    G;- Yi! 1 h* 0]. Q '? hR& -uf- h -hP- !- hiu v$ '? hR& -R !h$-h

    G;- !- hiu -"- h,-. T@ ^i %$ '? hR& -uf-J %$' i)' B G+ !hy& G* R

    X- i)' ! Q !/u@E- A- !hi! . iEu -$@ %$' i)' N- !h- @=u Au &

    h !h-. Q '? hR& (=-h -hP- !- hiu /& & Q '? hR& -uf- v$ !hB hi- '?

    hR& -R !h$-h !- hiu G$i h,-. ZB G+ !hy& +F !h=' v$* 'Q! h R h h

    %=- !- hiu ? '? hR& -ha vP@ 'Q! %si G* !; T' h* -hitu !;* /& !/=- u!

    +a- !/u@E- u& (=-h R !h +F hiu h-h %;i !;i '@ !hu.

    rRi hu- !h !/u@E- h! !h+a- q !A- !h- G)i &*J Q iEu h G* R -x-

    ( hiu '? hR& %=- 'Q! R- '&-. i (hi !/u@E- h! !hB hi- q N- ,

    )-J Q iEu h %$ iEu h N- J h&@ X- ^i %$ Q H-h G;- Y[*/'&!*/]J

    !hB hi- H-h G;- ( hiu ? '? hR& %=- 'Q! G;- R- !hh hF

    5

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    !/u@E-. #h- !h+a-J R 'Q! Q (huh ;i - u! !h\* &u Q iEu h. e>i

    !/u@E- h! !A- &*J iEu h v$ i)i iEu h !h+a- +F !hB hi- q !A-

    !/u- !A- YI]. ru v$* !/+a- hF -$@J 'Q! Q -T- !A- +F h- v$* iD& Q

    iEu h v$ (huh ;i - u!. ru !A- !/u- i&- %$ u !h * v>i !A-

    R- '&-J 'Q! !A- & hi=- )- !A- R- '&- +F @=u Au. e>i

    h !h- (h- GT@J R 'Q! &-!\- q !A- ui & '@ h!.

    H]F 1.1 Z, f (hi & 'Q! h !h- !h- !i- , )-.

    Z, f (hi h* !/*- !/*- h-h 1.1 h %$ u h-h 'Q! h !h- (i-h i-.MQ! u h-h h !h- !hB R !h h !; h,-. e>i 'Q! h !h- -hiEu -+ai pG-J 'Q! (hi Gf- (=-h +F h- v$* !/+> (hi iEu h. e>i h !h- & !/;'J'Q! (hi iEu (hi- & !/u@ -hP +F h- v$* !/+> '@ h!. C !hi! H (h

    -h+ !/)i !A- v$ '? hR& X- R !h +F !h=' v$* h !h-. MQ! h !h- !hBX- R !h ,- i)- h,-. M? hR& -uf- v$ '? hR& (=-h X- R !h (h- A-!hi! !/*- 'Q! h !h- ,- i)-. #/=- !hB !J h R (hi iEu hJ (=-hJ i)i iEuhJ v$ Q (huh ;i %$ -h! !hi! !/*- '^i h !h- !/u@E- !h- .

    1.1.2." h!nh #h$ h thng thng tin s #h$ %& i'( #h) v gii i'( #h)

    6

    #- hiu!+,- !B

    iEuh

    i)i iEuh

    i)i '?(=-h

    i)i '?hR& -uf-

    wz#- hiu!+,- !B

    M? hR&-uf-

    M? hR&(=-h

    Khu@h ;i- u!

    i)i (hu@h;i - u!

    K=-h!/u@E-

    #- hiu

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    H]F 1.2M h-h & h !h- !h- !i- h* vi iEu h v$ i)i iEu h.

    #y h-h 1.2J !- hiu -hP- +F !;i Au v$* & Q i)i iEu h R !h +Fvi! -h+ &u:

    [ ]Y ] Y ] Y ] Y ] Y ]( t 1 t s t h t n t = + Y1.1]#/*- R h hx !h hP. #/*- h-h 1.2 (=-h +F ' !) qi 3 @u !.

    #h -h! %$ Q %^ (=-h. w* !hB ! %$ Q %^ Y!] !y Q iEu h h)i u& '@ h!J(=-h Y!/u- i&- !/u@E- h!] v$ '@ !hu !/+> (hi -R R !h !>i Q i)i iEu hJ Q%^ (=-h G* R %$ 'Q! Q %^ hs- hF v>i h$' !/u@E- %$:

    Y ] Y ] Y ] Y ]P $ J= 5 = 5 = 5 = 5= Y1.2]

    #/*- R Y ]P= 5 J Y ]$= 5 J Y ]J= 5 %$ h$' !/u@E- & '@ h!J (=-h v$ '@!hu. CX- -h+ vP@J - lu- & Q %^ (=-h %$:

    Y ] Y ] Y ] Y ]P $ Jh t h t h t h t = Y1.3]

    #/*- R Y ]Ph t J Y ]$h t v$ Y ]Jh t %$ - lu- & '@ h!J (=-h v$ '@!hu. rhT- ! !h h&i %$ h zY!] '$ -Ri hu- %$ h. ~ -$@ iu Git- [&Gi-!/*- 'Q! G;- (=-hJ -h+ %$ (=-h v !u@- Gi Q-. rhT- ! !h & %$ -hitu Q-v$ h;- -hitu -Y!].

    1.1.* +hng -hng -h- t/(y'n n s

    .P(u)n *+n s b?ng gc.

    e>i -hD- !/u@E- h! (h*)- h -"-J iEu h N- !h+a- +F pG-. iEu h N- !h+a- +F ^i %$ '? +a-. MQ! husi ( hiu

    !h+a- +F p G- !;* -=- G;- R- lu- vu- v>i 'Q! i' -$* R

    iu Git- 'si G;- ( hiu '$ (h- R B -hP -h- &* h* h- R !h

    +F (hi h !/*- % !hu. ~-h 1.3 h* 'Q! G;- R- iEu h N- .

    w;- Au !i=- %$ iEu h non(4tu(n Q4(o3443 0RJT6 !hB hi- iu Git-

    'Q! ( hiu 1 qi 'Q! lu- vu- G+,- v>i Q G$i # v$ ( hiu 0 qi 'Q! lu-

    vu- T' v>i Q G$i #.

    7

    iEu h Q %^(=-h hY!]

    i)i iEuh

    rhitu[&Gi-zY!]

    rhituQ--Y!]

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    H]F 1.C !h G vE !/u@E- Gb- N- .

    w;- !h h&i %$ G;- iEu h uni&o3a( (4tu(n to Q4(o v>i 'Q! lu- G+,- QG$i #2 iu Git- ( hiu 1 v$ i !/H 0 iu Git- h* ( hiu 0.

    w;- !h 3 %$ G;- ' 3 h& Yih&\ %\v\%] h&@ m- ^i %$ M&-h\!\/J &u

    (hi h! 'i-h /& G;- -$@J vi iEu h p G- G;- R- f' 'Q! lu- #2

    G+,- v$ lu- #2 T' h* 1 v$ G;- R- )* -+F h* 0.

    %.P(u)n *+n s thng *"i.

    MQ! husi ( hiu +F p G- %$' !h&@ ci !h- & 'Q!

    !- hiu h-h i- !A- &* ^i %$ R- '&-. rRi hu-J 'Q! !- hiu h-h i- R 3!h- : i=- QJ !A- v$ h&. eP@ iEu h i=- QJ iEu h !A- J v$ GiEu h

    h& v$ %$ & - iEu h , )- !/*- iEu h !h- G)i.

    ~-h 1.4 h* & G;- iEu h R- '&- -hH hT- , )-. R %$ (hR& GHh

    i=- Q YzZK]J (hR& GHh !A- YZK]J v$ (hR& GHh h& YZK].

    #/*- zZKJ Q iEu h o@ /& 'Q! R R- '&- h* 'si ( hiu 1J v$

    (h- !- hiu -$* h* 'si ( hiu 0. #/-h !B -$@ X- +F ^i %$ (hR& P!g!"!

    YK].

    8

    Y&]r 1 0 1 1 1 0

    Y]U-i*%&/

    Y]iggL YM&-h\!\/]

    z

    gz

    z

    z

    gz

    gz

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    #/*- (hR& zZK !h- !h+a-J i=- Q h* ( hiu 0 (h- !hB B %$ 0.

    #/*- ZKJ v>i ( hiu 1J 'Q! R R- '&- !A- &* h,- +F h! /& v$

    v>i ( hiu 0 'Q! R R- '&- !A- !h h,- +F h! /&J h&@ -+F %;i.

    H]F 1.%& !/-h !B iEu h !h- G)i , )-.

    #/*- ZKJ 'Q! ( hiu 1 +F h! /& -h+ 'Q! R R- '&- v>i 0 %A- )*

    h& !/*- (hi ( hiu 0 +F h! /& -h+ 'Q! R R- '&- v>i h& )* 180.

    wB& !/=- & !/-h !B iEu h , )- RJ 'Q! %*;! !/-h !B iEu h R !h

    +F !' !h@ !y (! hF & h-. Ch- h;-J - h (! hF h&i !- hiu

    ZK YZK] v>i R- '&- !/B i&*J 'Q! !/-h !B '>i ^i %$ (hR& GHh h&

    Au h+,- YdZK] R !h +F !;* /&. - h iEu h ) i=- Q v$ h& &

    R- '&-J !& R !h !hu +F 'Q! !/-h !B ^i %$ iEu h i=- Q Au h+,-YdzM]Jv.v.

    1.2 TNG QUAN V TRNH T IU CH

    C !/-h !B iEu h %i! (= !/*- )- 1v$ T@ +F hT- %*;i !h$-h h&i hT-

    -hR' %>-: i=- H-h v$ i=- (h- H-h. #/*- %> i=- H-hJ R 3 %>

    *-: ZKJ ZK v$ CM. #/*- %> i=- (h- H-hJ X- R 3 %> *-: zZKJ

    dzM v$ iEu h i=- (h- H-h (h -D&J

    9

    1 0 1 1 1 0 0 1

    ZK

    zZK

    ZK

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    #/*- !/-h !B ? +F %i! (=J zZKJ ZK v$ ZK %$ iEu h , )-J

    m- MZKJ MZKJ CMJ M~M v$ dzMJ v.v. %$ !/-h !B -T- &*. C !/-h

    !B iEu h -T- &* %$ i- !h v$ (! hF & !/-h !B , )-.

    L> R i=- H-h -Ri hu- hS hF v>i h !h- !h- !i- R Q(huh ;i - u! h*;! Q- !/*- vS- hi !u@- & !u@- Au v$*gAu /&

    !hu +F hiu u) (huh ;i !i &. MQ! v G %$ ##z Y!/&v\%i- &v\ !u\

    &'%i[i\/]gQ (huh ;i - R- h;@ !/*- !h- !i- v !i-h. #u@ -hi=-J !/-h

    !B ZK -Ri hu- !/*- %> -$@ %$ (h- !hh hF v>i - G- v !i-h G* h-

    R hiu u) hc u !h * v>i !/-h !B ZK. ZK -hH hT- +F p G-

    !/*- (=-h iEu (hi- ! Q !h & h !h- ! $* !h h !h -h!J

    zMZ Y&Gv&-\ '*i%\ h*-\ \/vi\ *[ UZz] v$ k#zCZ Yku/*\&- !*!&% &\

    *''u-i&!i*- @!\']. # Q !/u@E- R !h %$ 10 K v>i zMZ v$ 8 K v>ik#z#C. C !/-h !B ZKJ &* f' ZKJ dZKJ dZKJ v$ MZK ? +F p

    G- !/*- h !h- !h- !i- v !i-h.

    4gdZK +F u&- !T' -h! qi (h) -N- !/-h Gi h& Q! -Q! 180 v$ h*

    hx i)i iEu h vi &i. #/-h !B -$@ ? +F p G- !/*- h !h- !h- !i-

    Gi Q- ! $*J -h+ h !h- ! $* M} YUZwC]YU-i!\G Z!&!\ Gii!&% \%%u%&/].

    #=- vi! !"! #=- vi! !"! !+,-

    +,-

    M !)

    KhR& GHh !A- YZK]ZK ZK KhR& GHh !A- -hH hT-MZK KhR& GHh !A- M '

    KhR& GHh h&ZK ZK KhR& GHh h& -hH hT-dZK 4ZK iEu h h& Au h+,-

    dZK ZdZK [[\! dZKJ Z!&\/\G dZK 4gdZK 4 iEu h h& Au h+,-

    MZK iEu h h& M '

    iEu h h& %i=- ! YCM]Z~M Zi-%\gh Yh iEu h] h&\

    '*Gu%&!i*-M~M Mu%!igh Yh iEu h] h&\

    '*Gu%&!i*-LkC \!&-u%&/ u%\ *[ %\-!h LCZK C*-!i-u*u h&\ hi[! (\@i-MZK ZK KhR& GHh h& !i !hiuJ [&! ZK

    ZMZK Z\/i&% 'i-i'u' hi[! (\@i-LC &i\G *i-\ u%\ *[ %\-!h L

    10

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    LZC Z\!/&%%@ /&i\G *i-\ u%\ [[ %\-!h LMZK KhR& GHh h& B !iu#M #&'\G [/\u\-@ '*Gu%&!i*-

    C %*;i iEu h (! hF Yh& v$ i=- Q]zZK iEu h i=- QK zZK iEu h i=- -hH hT-

    MzZK MzM iEu h i=- M 'dzM iEu h Au h+,-

    C iEu h i=- (h- H-hdC du&G/&!u/\ *v\/%&\G /&i\G *i-\

    '*Gu%&!i*-ZdC Z!&\/\G dCdZC du&G/&!u/\ *v\/%&\G u&/\G /&i\G

    *i-\ '*Gu%&!i*-

    d2

    ZK du&G/&!u/\ u&G/&!u/\ h&\ hi[! (\@i-IgdZK I-!\/@'*%gi-!\/[\/\-\i!!\/g[/\\dZK

    #ZIgdZK #*g@'*%gi-!\/v&% dZK ZdzM iEu h Au h+,- vu- RZK C/**//\%&!\G dZK

    #^ 1.1. C !/-h !B iEu h

    11

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    HF 1.6 CT@ iEu h

    C !/-h !B ZK R i=- H-h -h+- hu@- h& (h- %i=- ! !y ( hiu

    -$@ &- ( hiu (h.

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