Download pdf - Nghiên Cứu Hệ Thống Mimo Ofdm

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n-c(3Vnng ! S5C$, t, h-p khu:ch 84 8;ng 8a thu\_i >yu NCu giD^ &Dt NDN nhDnh \in toN S #ng thDi*#ijurW hiHu #IdN \@U Nhen \^ \g th@N tA thR tgn hiHu #An \ tvng NiU tgn hiHu guN S nhiuM 1NM & #IdN \@U NhenSR #X #E #IdN 1N \ cht rhs*Rx 1 Rx 2 Rx nRn* hIBng ZhDZ tv hdZ \@U Nhng tv hdZ NhuyXn ^_Nh M >a thu Vutt tEn >#IdN Nhen \^ \ui cUM NhE #An rhi 1t #Cu Vutt \_i S NhuyXn &Ung nhDnh rhDN* $ hRnh ny N]ng N:n #IdN gei \Zhn tQZ Vutt )cannng B*NQ)t1*1E SJi Zhn tQZ \@U NhenM Zhn tQZ NhuyXn ^_Nh Ns Nhht \Idng rt^ hBn SRZhIBng ZhDZ 1C rhng Nhen \eN tgn hiHu tut nhht ât NDNh \in toN* 0uy nhinM ns\_i th@N hiHn #Bn giPn hBn SR rhngVJi NP ) ^ hRnh Zhn tQZ \@U Nhen S Zhn tQZ NhuyXn ^_NhM tgn hiHu \ui cU NhO>ng ât tcEng nhGng nhDnh Zhn tQZ ^ thi* 0h^ nGUM NhYng \_i rhng yu NCu >htrF ât thng tin nE Sj rnh* 6E #sM ) ^ hRnh ny Ns thX & Kong #X rAt hdZ SJiNhA Ns \in rAt N]ng nhI #iju NhA rhng Ns \in rAt* LA CHN SNR TI A0ijn = \W #H^ 0ijn = \W #H^ 0ijn \W #H^ * * * .ui cUfQ)Q9nQ=

nfRx 1 Rx 2 0ijn = \W #H^ 0ijn = \W #H^ 0ijn = \W #H^ QUT GI R VT NG TR SN NGRx nR9nQ)QfQ* * * .ui cUHRnh f-fq* hIBng ZhDZ tv hdZ NhuyXn ^_Nh1.'.3. T, h-p t6 )7 t70v hdZ tO &u tui #U \ ât ZhIBng ZhDZ tv hdZ tuyAn tgnh* 0cEng ât >a = \W tvn hiHu \ui SE #IdN #Dnh tceng &u cing S Nang SJinhUu ff*,nJi 8a #M9C$hdZ tuyAn tgnh nsi NhungM NDN tg#X \^ thnh tgn hiHu \ui cU* NhGng hH &u Ns thX #IdN \@U Nhen thE ât Si NDNh*0gn hiHu \ui cU \ ât tv hdZ tuyAn tgnh NiU NDN >Pn &UE NiU tgn hiHu nhQn #IdN:9n Q Q S

Q M

\ tgn hiHu thu S hH &u nhn NiU nhGng hH &u nhn NiU NDN ng-tn thu #IdN Nhen t \H SJi tO &u Nng &uht tgn hiHu tcn& htng-tn thl * 0cEng tv hdZ tO &u tui #UMNng u nhiu* ytF S \ >in #a S ZhU NiU tgn hiHu thuQ * GiP & ^bi ng-tn

Ns Nng Nng &uht nhiu tcung >RnhM hH &u nhn

Ns thX >iXu Kin KIJi K_ng:

H N Ff*,qhIBng ZhDZ ny #IdN gei \ tv hdZ tui Iu 1N \ui cU tui #U >ng tvng tO &u 1N NiU t\W \ tvng NDN tgnhiHuu SR ns Ns thX tui #U hsU 1N \ui cU* 0O& ng nhDnh cing >iHt*0cEng ^ hRnh nyM ^bi tgn hiHu cing >iHt ZhPi #IdN \^ #ng ZhU S nhn âthH &u tIBng lng SJi >in #a NiU ^bi nhDnh* 0gn hiHu &Uu rhi #% =NiU NDN nhDnh #% #IdN #ng ZhU S nhn hH &u* 0cEng ^ hRnh ny yu NCu thngtin Sj ZhU S >in #a NiU rnh ZhU-#inh* VQy nnM ns Ns thX ZhPi rAt hdZ SJi SiHN K:rnh Ns \in rAtM nhIng rhng thX th@N hiHn #IdN SJi K: rnh rhng \in rAt*

n) x0ijn = \W #H^ 0ijn = \W #H^ 0ijn = \W #H^ Rx 1 Rx 2 Rx nR9nQ)QfQ* * * f)9n.ui cUHRnh f-f+* hIBng ZhDZ tO &u tui #U1.'.'. T, h-p khu:ch 84 8;ng 8ining \ ât ZhIBng ZhDZtv hdf*,+0hE ZhIBng ZhDZ nyM tEn >a tgn hiHhH &uEng hRnh f-f(* hiNhO ththu tng \n thR Nhht \Idng N]ng tng thE*0cIDtv hdZ0v hdZ rhuANh #_i #ng #ju {GC - {Z tuyAn tgnh tui Iu* Ns rhng yu NCu thng tin Sj >in #a ZhU-#inh NiU ^binhDnh* HH &u nhn SJi ^bi nhDnh \ f*

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q)Imm0 & #^dN NhuyXn #vi tc% Sj K_ng KG \iHu nui tiAZ >ng >a NhuyXn #vi &Eng &Eng -nui tiAZ 1* X tciHt tiu #^dN nhiu =uyn rW hiHu I1IM S nhiu ICIM tgn hiHu #^dNNh`n th^ C #X rtE Ki Nhu rF rW hiHu S Ns rhEPng >PE SH* hEPng ny & Ns tDNKong tciHt tiu hEn tEn nhiu I1I nAu ns \Jn hBn thDi giUn tcPi tc KE rnh gy cU* 1Uurhi #% #^dN Nh`n rhEPng >PE SHM tgn hiHu K_ng &u #s & #^dN NhuyXn #vi &Ung K_ng tgnhiHu t^Bng t@ 6AC #X ZhDt #i* 1Imm01 Ch`n C 6AC nh iju NhA 8m6$G#n,1$G#n,Kc!1$)#n,T$)#n,1$)#n,K !1$c)n1mm01 .E_iC A6C 1#n,T$1#n,1$1#n,K !1$cQ#n,T$Q#n,1$Q#n,K !1$cQn1nGnGiPi #iju NhA 8m6$HRnh )-w* 1B # rhui hH thung thu-ZhDt 8m6$1Uu rhi VuU rnh tcuyjn Ns tDN #ang NiU nhiu GUu&& tcng Nang tgnh AGNM tgnhiHu #^dN \hy ^Lu S NhuyXn #vi Sj K_ng &u nhD >a A6C* 0iAZ #AnM ZhCn C #^dN\E_i >?M NhuyXn t K_ng nui tiAZ &Ung &Eng &Eng 1 #X Nhun >~ NhE VuD tcRnh >iAn#vi mm0 NhE tc% Sj tc_ng thDi >Un #Cu* CDN rW hiHu &Eng &Eng &Uu >a mm0 #^dN NhuyXnSj K_ng nui tiAZM #s Nhgnh \ KG \iHu >Un #Cu*0cn #y \ nguyn \W NB >PnM No thX \ tgnh tc@N giUEM KPi >PE SH S ZhtZ >iAn #vimEucic tcEng r! thuQt 8m6$* y \ nhGng #yN tgnh NB >Pn nhht NiU r! thuQt 8m6$:tgnh tc@N giUE #% #^dN rhng #~nh NhN Nhn Sj hiHu VuP NiU ns tcEng \W thuyAt tcuyjntin KPi >PE SH NhE ZhtZ #P^ >PE tgnh tc@N giUE #ng thDi giYZ \E_i >? #^dN I1I S ICIN:n ZhtZ >iAn #vi mEucic #% giYZ NhE r! thuQt 8m6$ Ns thX #^dN lng Kong cang c%itcn th@N tA* Cng SJi nhGng nghin Nlu &u hBn Sj \W thuyAtM 8m6$ #Ung Nhlng t? qnnhGng û #iX^ NiU ^Rnh tcEng NDN hH thung Sin thng tcn th@N tA #yN >iHt \ tcEngZhDt thUnhM tcuyjn hRnh &u S NP tcEng thng tin Ki #ang*VJi nhGng hiHu VuP KE = \W tcEng r! thuQt 8m6$ Ûng \_i #% ZhCn nE rhNZhoN #^dN nh^dN #iX^ NiU hH thung $I$8* 6E SQy rAt hdZ hH thung $I$8-8m6$& \ ât Zh^Bng ZhDZ hlU hn Ûng \_i nhiju \di thA*3&8& 1SR hvQ MIMO-O!M$% hsU10 GiPi ^%10 iju NhA8m6$ iju NhA8m6$ GiPi #ijuNhA 8m6$ GiPi #ijuNhA 8m6$ M fk n G M k n GTn M fk n 1 M k n 19n M k n ) M k n ).ui cU.ui SEHRnh )-x* HH thung $I$8-8m6$0_i thDi #iX^ thl nM rhui tgn hiHu #Cu SE &n #^dN ^% hsU 10 thnh n rW hiHuT^% hsU t^Bng lng SJi NDN nhDnh ng-tn ZhDt* CDN rW hiHutcn ^bi nhDnh & #^dN #Û VuU >a #iju NhA 8m6$M &Uu #s #Û cU ng-tn* 0_i ^bing-tn thuM tgn hiHu thu & >ng tvng tgn hiHu t NDN nhDnh ZhDt &Uu rhi tcuyjn VuUrnh t^Bng lng* M M M ) fn G n G n GTnNh^ #^dN tcRnh >y tcEng ôN )*) tgn hiHu cU &Uu rhi giPi #iju NhA 8m6$ t_i ât&sng Ûng >ht rF >ng tvng NiU tgNh tgn hiHu #Cu SE >a Imm0 t^Bng lng S #DZ lngtCn &u NiU rnh tcuyjn giGU ) ng-tn S thnh ZhCn t_Z ^ tcng Nang tgnh* 6E #sM&Uu rhi #i VuU >a giPi #iju NhA 8m6$M tgn hiHu tcn ^bi nhDnh >ht rF #^dN =DN #~nhnh^ &Uu:)*fn+Tn

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Hk n J =SK9 )*fqtcEng #sM = \ rW hiHu NiU giD tc~ tcung >Rnh*ViHN giPi ^% 10C #^dN th@N hiHn >ng NDNh & Kong thuQt tEDn Vitc>i* _i\^dng #^dN & Kong #X VuyAt #~nh tun thE #~nh \uQt $.: ) M M M k n G k n J k n 1 )*f+0cEng #sM \ >iXu Kin NiU rhEPng NDNh {uN\iKM M k n 1 M M \Cn\^dt \ StNtB tgn hiHu thu #^dNM StNtB rnh ^JN \^dng S StNtB tgn hiHu ZhDt ^JN \^dngnh^ K^Ji #y: M k n J M k n G M M M M )fk n 1k n 1k n 1k n 19n M M M M M M f MMf f Mfk n J k n Jk n J k n Jk n JT 9 9Tn n nnO)*f( M M M M )fk n Gk n Gk n Gk n GTn0 >iXu thlN )*f+ &uy cU SiHN ^JN \^dng thU^ &u rnh #sng SUi tc: VuUn tceng#ui SJi NhO tiu Nhht \^dng NiU hH thung $I$8-8m6$* VUi tc: S Pnh h^%ng NiU ^JNq+\^dng rnh tcEng hH thung $I$8-8m6$ & #^dN tcRnh >y No thX tcEng ZhCn &Uu NiU\uQn Sn*3&9& âO ^svng g[nh RY}ng hz Rh{ng MIMO-O!MCs n Zh^Bng ZhDZ Nhgnh #X th@N hiHn ^JN \^dng rnh:\JN \^dng rnh Kng tgn hiHu hEU tiu i\Et-AiKK ChUnn\ {&tiÛtiEn -AC{: 0_i >n ZhDtM th@N hiHn Nh`n tgn hiHu #% >iAt hEU tiu SE rhung tgn hiHu8m6$ SJi rhEPng NDNh nhht #~nh tcEng îjn thDi giUnM tCn &u* 0_i >n thuM tgn hiHu\hy ^Lu t^Bng lng SJi NDN #iX^ Nh`n hEU tiu NhE ZhtZ #Dnh giD rnh tcuyjn hH thungt_i S~ tcg hy* ng Zh^Bng ZhDZ nai &uyM t nhGng #iX^ Nh`n hEU tiu #s tU &uy #^dNgiD tc~ rnh tcuyjn t_i NDN #iX^ rhDN tcEng rhungM giYZ NhE SiHN VuyAt #~nh tgn hiHuNhgnh =DN hBn*\JN \^dng rnh #H Vuy 6Ni&iEn-6icNtK ChUnn\ {&tiÛtiEn - 66C{:h^Bng ZhDZ ny N]ng Nh`n tgn hiHu K_ng hEU tiu nh^ng gt hBn* 0gn hiHu #% >iAt hEUtiu hUy Nhubi huhn \uyHn NhO Nh`n t_i #Cu ^bi rhung* 0_i >n thuM K@U SE Nhubihuhn \uyHn #s #X >iAt thng tin rnh t_^ thDi* Un #Cu tgn hiHu #^dN VuyAt #~nh thngVuU thng tin rnh t_^ thDiM &Uu #s NP thng tin Sj tgn hiHu SU #^dN = \W ny \_ithU^ giU SE SiHN VuyAt #~nh tgn hiHu &Uu*** 0hng tin NiU NP rhung #^dN tQn Kong tui#U* 0uy nhinM #s N]ng \ ât nh^dN #iX^ NiU Zh^Bng ZhDZ ny* hi tgn hiHu \yZ \_iVuD nhijuM tuN #a = \W Nhung & giP^ #iM rhs Ns thX DZ Kong NhE nhGng lng Kong #:ih?i thDi giUn th@N rhi ^ rhung KG \iHu VuD \Jn*\JN \^dng rnh >ng Zh^Bng ZhDZ ^ \inK1î-\inK ChUnn\ {&tiÛtiEn -C{:y \ Zh^Bng ZhDZ rhng & Kong SiHN Nh`n tgn hiHu #% >iAt t_i >n ZhDt*QuyAt #~nh tgn hiHu NhO K@U SE thng tin NiU tgn hiHu thu* h^Bng ZhDZ ny tuy Ns tuN#a tcuyjn tin NUE KE rhng Nh`n th^ tgn hiHu hEU tiu nh^ng tuN #a = \W t_i >n thuthhZ S Nhht \^dng VuyAt #~nh rhng NUE >ng ) Zh^Bng ZhDZ tcn*2.'.1. >h?@ng php ?Ac .?-ng knh BCng tDn hEu h(a tu #>FC=$Nguyn \W Nhung NiU AC{ \ >n thu th@N hiHn ^JN \^dng rnh K@U tcn NDN tgnhiHu ZhDt #% >iAt tgn hiHu hEU tiu #^dN ghtZ tcEng KG \iHu ZhDt* ViHN ghtZ tgn hiHuhEU tiu tcEng KG \iHu ZhDt #^dN th@N hiHn t_i ât &u S~ tcg =DN #~nh tcEng # th~ thDigiUn - tCn &u NiU ât rhung KG \iHu 8m6$*X #Bn giPnM tU & >t#Cu tR^ hiXu Zh^Bng ZhDZ AC{ #ui SJi hH #iju NhA8m6$* V ci & ^% cang NhE hH $I$8-8m6$* hi #sM tgn hiHu hEU tiu Nh`n SE\_i NCn th^ #iju riHn Sj tgnh tc@N giUE* q(HRnh )-f- >iXu Kin tc^Dng hdZ #Bn giPn rhi NDN rW hiHu hEU tiu #^dN Nh`n SEthE K_ng NhG nhQt SJi rhEPng NDNh giGU hUi rW hiHu \in tiAZ tcn îjn thDi giUn \ 6tS tcn îjn tCn &u \ 6 * -N -fC DtN -f1 Df6G \iHui\EtV~ tcg ^JN \^dng rnhHRnh )-f-* $ hRnh Nh`n rW hiHu hEU tiu tcEng ât rhung KG \iHu 8m6$Nh^ SQyM SiHN ^JN \^dng rnh #^dN th@N hiHn thE tng rhung* tt ât rhung8m6$ NhlU N rW hiHu #^dN #Dnh &u t -MfM***MN -fM & Kong N &sng ÛngM rW hiHu1 1 C-MfM***M N -f*C0gn hiHu thu #^dN t^Bng lng SJi ât rhung 8m6$ \: M M M M k n 5 k n J k n G k n 1 + )*f,0cEng#s M M \Cn \^dt \ tgn hiHu ZhDtM #DZlng rnhtcuyjn S t_Z ^ njn* M k n G M k n J M k n 5GiP & tgn hiHu hEU tiu #^dN Nh`n thE ^Lu hRnh NhG nhQt SE NDN S~ tcg t^Bnglng nM r SJi S~ tcg #Cu tin t^Bng lng SJi n-M r-* hi #sM rW hiHu hEU tiu ^dN Nh`n % NDN S~ tcg nh^ &Uu: f M Mf M- M f M Mf M- M t S tf C fD K p pD kD K p pD n)*fwtcEng #sM rW hiHua\ \hy giD tc~ nguyn nh? nhht rhng >t hBn a*j zJN \dng rnh & Kong >a \eN )6\JN \^dng rnh & g^ ) >^JN: ^JN \^dng rnh t_i NDN S~ tcg Nh`n tgn hiHu hEUtiu S ^JN \^dng rnh tcn tEn >a NDN S~ tcg N:n \_i tcEng rhung* q,0_i NDN S~ tcg Nh`n rW hiHu hEU tiuM #DZ lng tCn &u NiU rnh #^dN =DN #~nh >ng>iXu thlN: M M M M M M k n Gk n 5k n Jk n Gk n 1k n J+)*fx0_i NDN S~ tcg N:n \_i NiU rnhM #DZ lng tCn &u NiU rnh #^dN =DN #~nh >ng NDNh& Kong NDN giD tc~ #% #^dN ^JN \^dng NiU rnh t_i S~ tcg tgn hiHu hEU tiu #Û VuU >a\eN ) Nhiju )6:)*)-k nW k nk n J k n k n c k n JM M M M M M M tcEng #sM \ #DZ lng =ung NiU >a \eN ) NhijuM \ tQZ hdZ NDN S~ tcg tgnhiHu hEU tiu #^dN & Kong #X ^JN \^dng #DZ lng rnh % S~ tcg #n,k$* 0cn th@N tAM #XgiP^ \^dng ZhtZ tgnh ZhPi th@N hiHn tcEng ^JN \^dngM ng^Di tU NhO & Kong ât ZhCntcEng tEn >a #DZ lng rnh t^Bng lng SJi NDN S~ tcg Nh`n rW hiHu hEU tiu* Gei &u ZhCnt tcEng \ * hi #s: M M M k n k n ck nMWk nMWtapKtSfCgQB tapDKDKK K )*)fSJi \ &u S~ tcg Nh`n tgn hiHu hEU tiu tcEng ât rhung 8m6$*gQBKVhn #j #yt cU SJi ^JN \^dng rnh \ =DN #~nh NDN hH &u NiU >a \eN &UE NhE =DN&uht &Ui \HNh ^JN \^dng rnh \ nh? nhht* DN &uht &Ui \HNh ^JN \^dng rnh #^dN =DN#~nh thng VuU h^ >Rnh Zh^Bng &Ui \HNh tcung >Rnh: )M M M k n J k n J = MS=k n)*))CDN hH &u >a \eN #^dN =DN #~nh thE nguyn \W tc@N giUE:[]{ }k nW k n k n J k n J k n J =M M M- M M M )*)n0hA )*)- SE )*)n thu #^dN Zh^Bng tcRnh &Uu SJik nW k nM M :{ } { }k nW k nk n J k n J = k n k n c k n J k n J =M M M M M M M M M )*)q qw0 giP thiAt t_Z ^ tcEng >iXu thlN )*fx Ns giD tc~ ngLu nhin SJi rFSeng >ng - S #aN \QZ SJi S~ tcg #n,k$ &uy cU: M k n 5{ } { } M M M M M k k n nk n J k n J = k n J k n J = )*)+tcEng #sM M k k n n \ h^ t^Bng VuUn cDi c_N tcn îjn thDi giUn - tCn &u NiU#DZ lng rnh* $yt rhDN:{ } { }{ }{ }{ } M M M M M M M M M M M M M M M M M M M M M M )k k n n k k n nk n G k n G =k n 5 k n 5 =k n J k n J =k n G k n Gk n 5 k n 5= k n J k n J =k n Gk n 5k n Jk n Gk n 5k n J =k n J k n J = + ++++ )*)(SJi \ Zh^Bng &Ui NiU thnh ZhCn t_Z ^ nMrM) M P p \ h^ K\tU ) Nhiju#^dN #~nh nghU nh^ &Uu:)*),! + - M-- Mf M ) )P pP pP p 0hUy >iXu thlN )*)+M )*)( SE )*)q S >iXu Kin NhE tht NP NDN giD tc~ NiUS & Kong >iXu Kin StNtB & thu #^dN:k nW k nM M )*)w M M k n c k nT TtcEng#sM \ StNtB rgNh N[ M k n f tapK ^ NDN thnh ZhCn \ M k k n n M\ StNtB rgNh N[ M k n c f tapK SJi NDN ZhCn t \ S \ Û tcQnSung rgNh N[ g^ NDN ZhCn t * M M M k n k n c tap tapK K M M )k k n n k k n n + 0 >iXu thlN )*)w tU &uy cU hH &u >a \eN ^JN \^dng rnh tui û t^Bng lng SJi^bi S~ tcg nMr #^dN =DN #~nh >ng:)*)xf M M k n k n cT TNhQn thhy cng Û tcQn & rhng Zho thuaN SE S~ tcg nMr nAu tEn >a #DZlng rnh tcEng rhung 8m6$ #ju #^dN =DN #~nh tcn ât tQZ S~ tcg rW hiHu hEU tiu* iju #s NhO =Py cU rhi tht NP NDN rW hiHu hEU tiu #ju #^dN & Kong #ng thDi #Xk nMW

qx^JN \^dng tht NP NDN S~ tcg KG \iHu rhDNM rhi #sgQB tapK K * 0uy Û tcQn NhO NCn=DN #~nh ât \Cn nh^ng &u \^dng ZhtZ tgnh NCn Kong \_i cht \Jn* VR SQyM ng^Di tU NhO &Kong ât Si tgn hiHu hEU tiu \n NQn S~ tcg KG \iHu NCn =DN #~nh #X ^JN \^dng ^ thi*j zJN \dng rnh & Kong >a \eN )=f6*Nh^ #% tcRnh >y tcEng ZhCn tcnM &u \^dng ZhtZ tgnh NCn th@N hiHn rhi & Kong>a \eN )6 tcn îjn thDi giUn-tCn &u \ cht \Jn* NnM #X giP^ \^dng tgnh tEDn tcEng rhiSLn giG #^dN #a Nhgnh =DN nhht #~nhM ng^Di tU & Kong ) >a \eN f Nhiju t^Bng lng SJiSiHN ^JN \^dng thE ) h^Jng: thDi giUn S tCn &u*- tN -f1-N -fCf6G \iHu i\EtHRnh )-ff* \JN \^dng rnh AC{ )=f60h@N NhhtM Zh^Bng ZhDZ & Kong ) >a \eN f Nhiju g^ ) >^JN ^JN \^dng:S?Ac 1: 1 Kong thU^ &u >a \eN f6 thE îjn tCn &u fk c #X ^JN \^dng rnh: M n h k c k n Jf)*n-VtNtB hH &u >a \eN fk c NhO Zho thuaN tCn &u r S #^dN =DN #~nh thE >iXuthlN )*))M tcEng #s >? VuU thnh ZhCn thDi giUn n* VtNtB nh Ns #a Ki rhng \JnhBn &u tgn hiHu hEU tiu tcn ât NatM fCDK* ViHN ^JN \^dng thE >iXu thlN )*n-#^dN th@N hiHn t_i tSDKNat Ns tgn hiHu hEU tiu tcEng ât rhung 8m6$*S?Ac 2: 1 Kong thU^ &u >a \eN f6 thE thDi giUn tn c #X ^JN \^dng rnh: +- M M k h k c k n J k n Jf t t)*nfiXu thlN )*nf NhE thhy SiHN^JN \^dng rnh thE îjn thDi giUn K@U tcnnhGng #DZ lng rnh #% ^JN \^dng thE îjn tCn &u* 0 #yM NDN KG \iHu thE tnghng #^dN ^JN \^dng K@U SE #DZ lng rnh #% >iAt*! thuQt ^JN \^dng rnh ât Nhiju f6 NhE hH thung 8m6$ Ns thX Zhn thnh) \E_i NB >Pn &Uu fn:U Rnh Zh^Bng tui thiXu .1 - .U&t-1VuUcK> 0ui thiXu &Ui \bi tcung >Rnh >Rnh Zh^Bng $$1{ - $iniû^ $Un 1VuUcK{ccEca ^JN \^dng .1 Ns #a ZhlN t_Z thhZM NhO K@U SE tgn hiHu hEU tiu ^ rhngtgnh #An tgnh t^Bng VuUn giGU NDN rnh tcuyjn* 6E SQy Zh^Bng ZhDZ ny >~ &Ui \bitcung >Rnh >Rnh Zh^Bng $1{ NUEM #yN >iHt tcEng Sng Ns t \H 1N thhZ* 0cEng rhi#sM >a ^JN \^dng thE Zh^Bng ZhDZ $$1{ SU K@U tcn tgn hiHu hEU tiu SU tgnh #AnnhGng thung r tcn îjn thDi giUn NiU rnhM nn &Ui \bi $1{ & nh? hBn nhiju*Nh^ng Zh^Bng ZhDZ $$1{ \_i Ns #a ZhlN t_Z NUE*h^Bng ZhDZ ^JN \^dng .1 =DN #~nh h^ tcuyjn nh^ tcEng Zh^Bng tcRnh )*fx#% >iAt % tcn* 1Uu #y tU =^ =tt Zh^Bng ZhDZ ^JN \^dng $$1{ S tcEng ZhCn ^Zh?ng tU & &E &Dnh ) Zh^Bng ZhDZ ny*X giPn tiHn tcEng NDNh SiAtM tU Ns thX SiAt \_i )*)- K^Ji K_ng:J C J )*n)0cEng #sMJ MJ \ ^JN \^dng rnh t_i S~ tcg tgn hiHu hEU tiu S t_i NDN S~ tcg KG\iHu* C \ #DZ lng =ung >a \eN*NAu DZ Kong #~nh \uQt >Rnh Zh^Bng &Ui \HNh >t nhht $$1{M thU^ &u Û tcQn C& #^dN =DN &UE NhE h^ tcung >Rnh &Ui \HNh ^JN \^dng &Uu #y \ nh? nhht: ) J J = C MS= )*nnX giPi >i tEDn $$1{M DZ Kong nguyn \W tc@N giUE:{ } -JJ J J = )*nq0hA >iXu thlN )*n) SE )*nq tU thu #^dN:{ } { }J JJJ = JJ C= )*n+ +fX tgnh #^dN C tU & rhUi tciXn NDN #_i \^dng { }JJJ = S { }JJJ ={ } { }{ }fJJ JJJ =5 J J = JJ =+ )*n(SJi \ Û tcQn t^Bng VuUn îjn tCn &u NiU #DZ lng rnh nf+ + - ) f ) - f f f - f C f C fC f f fC f f ffK KKK O)*n,0cEng #sM nAu R \ Nhiju Ki C* T \ tuN #a \hy ^Lu NiU hH thung S) \ tcPitc c^& thR: fn{ } c )RTK k HTR3 n k 3 n fK T k H NNJ J = k)c) ) f ff )M M ++ +)*nw$yt rhDN:{ } { }{}{CK fJ JJ JI55 = JJ =5 J 5 J = JJ = + ++ + } )*nx0cEng #sM{ }))G5= 5 = *0hA )*n(M )*nx SE )*n+ tU thu #^dN:f + CK f fI C )*q-0 #sM #DZ lng rnh & #^dN ^JN \^dng >ng:J I JCK f ff + )*qf2.'.2. kAc .?-ng knh tQ(ng hE th7ng MIMO!OdDMtt hH thung $I$8-8m6$ & Kong ^% hsU A\UÊuti SJi Nhu tcYN #^dN NhEtcn hRnh )-f)* 6G \iHu >Un #Cu #^dN #Û VuU >a ^% hsU A\UÊuti thE tng rhui )NC

+)rW hiHu * QuU >a ^% hsU A\UÊutiM tgn hiHu #^dN &Z =AZ \_i thnh )\ung nh^ &Uu:CKG G G) ) fM M M.ung f:) f )) f )) fM M M M M M MC CK K k kG G G G G G .ung ):f ) )f ) )f )M M M M M M M C CK K k kG G G G G G 1S Nh`ni\Et Imm0 1S Nh`nC Ch`n&sngÛng rhuANh#_i ) f )) fM M M MC CK KG G G G 1S Nh`ni\Et Imm0 1S Nh`nC f ) )f )M M M MC CK KG G G G $%hsU10C CKG G) fCh`n&sngÛng rhuANh#_i Tk1mm0 1S >?C 0DNh&sngÛng CK1 1 1) Mf ) Mf f MfM M M 1mm0 1S >?C 0DNh&sngÛng CKG G) f GiPi^%10C CK1 1 1) M ) ) M ) f M )M M M \JN \^dng rnh RkHRnh )-f)* HH thung $I$8-8m6$1Uu #s tgn hiHu hEU tiu #^dN Nh`n SE thE Vuy tN tc@N giUEM nghU \ t_i thDi#iX^ Nh`n tgn hiHu hEU tiu nhht #~nh NhO Ns f nhDnh Ns tgn hiHu tcuyjnM N:n nhDnh riUthR tcung Nu\\* Nhu rF rW hiHu tiAZ thE #s thR ng^dN \_i* VQy \M t_i ^bi ng-tnthuM tgn hiHu nhQn #^dN NhO KE f ng-tn ZhDt #i* 0 #sM NDN rnh tcuyjn & #^dN =DN#~nh thE tgn hiHu hEU tiu* #yM tU ZhPi Nh`n tgn hiHu hEU tiu tc@N giUE SR SiHN giPi +n^% 10CM No thX \ ^% A\UÊutiM NCn >iAt #^dN NDN rnh tcuyjn thnh ZhCn #X tv hdZt_i >a thu* ViHN Nh`n tgn hiHu hEU tiu #^dN thX hiHn tcEng hRnh )-fn K^Ji #y*ng-tn f ng-tn ) 0gn hiHu i\Et6G \iHu V~ tcg tcungHRnh )-fn* Chu tcYN rhung tgn hiHu $I$8-8m6$VJi tng NyZ rnh tcuyjnM ^JN \^dng h^ tcuyjn #^dN =DN #~nh nh^ SJi hH thung8m6$* 1Uu \Cn nai &uy thE îjn tCn &uM giD tc~ h^ tcuyjn q rnh 1I18 #^dN =DN#~nh* 0iAZ toN ^JN \^dng ^% cang thE îjn thDi giUn NhE NDN Sng KG \iHu* .YN nyMtht NP NDN S~ tcg tcEng rhung $I$8-8m6$ #ju #^dN ^JN \^dng rnh tcuyjn*NhiH^ So tiAZ thE \ giPi ^% A\UÊuti #X thu #^dN tgn hiHu tcung th@N* ViHN giPi^% #^dN th@N hiHn Nng \YN SJi q tgn hiHu % ) Nhu rF \in tiAZ t_i ) ng-tn thu* AtVuP tv hdZ tgn hiHu thu #^dN thX hiHn tcEng f*q+ S f*q(:)*q) + +)f) ) M ff M)ff)f)M f HHHHH H HI h I h G h G)*qn +)f) f M f) M)f))f)M ) HHHHH H HI h I h G h G0hnh ZhCn t_Z ^ GUu&&M M KE Ns giD tc~ ngLu nhin S tc~ tcung >Rnh >ng -nn thnh ZhCn tcEng )*q) hUy tcEng)*qn Ns thX t@ > tc ZhCn nE NhE nhUu* 0cEng rhi #sM thnh ZhCnH

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