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Truy?n cu?n theo chi?u gio pdf

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rong Cu n theo chi u gi (Gone with the Wind) c a. (Nguy n V n H u, ): n quy nh th ng x c a con. c truy n H U CU N THEO CHI U GI - PDF ( MB). Why Everyone Seems To Be Speaking About Read Cun Theo Chiu Gi Download: Truyn c in Margaret Mitchell Online Reading at Description: TiU ThuyT CuN Theo ChiU Gio BNg TiNg Anh Ebook PDF:Theo anh n6i dSn g6m Nam b9 Khi. MJlZ^1*V A^VOn • t £ a -few. W icut _ aUvu£u cLc lkU 4a JJ^^ • n*l£ ih&L. iwT .. C-fc anh ch; em ^a ti£p tin Ms Cu^ve vdi ChuaAn~ay_lV01/77 caite.info nao lanl du" dc . Vo'i thu" nay chyng t8i xin g§i Cy # de them chi-phx trong chuyen di hau vi|c .. itfhtfng xin Chua cho m5i>Muc/su' Truyen dao deu doc can than, t8i.

Thi van drip k6r rhric hoc phin phaii do hai giang vi6n rhLrc hi6n. Cc sng mang c iu ch s qua php nh x Mapping da trn c s biu chm sao constellation ca k thut iu ch s. Cc pixels ny c m ha nh th tt c chng u l phn t nh video nh ng. Bn ph sng ca truyn hnh An Vin c th hin nh hnh 4. Tn hiu truyn hnh s c a ti thit b pht.

Tnh trc giao ca cc sng mang Vic s dng s ln sng mang tng nh khng c trin vng lm trong thc t v khng chc chn, v s cn rt nhiu b iu ch, gii iu ch v cc b lc i km theo. C nhiu nguyn nhn gy ra suy gim tnh trc giao v do s gy ra nhiu tng h gia cc sng mang ICI. Chng c th l cc li xy ra trong vic ly mu tn s ca my thu hay phase-noise trong cc b to dao ng ni.

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Tuy nhin trong thc t, nhng nh hng ny c th c gi mc gii hn c th chp nhn c. Bin i IFFT v iu ch tn hiu K thut iu ch a sng mang phi s dng nhiu mch iu ch cu phng v cc b lc nhng chng ta trnh c iu ny da vo thnh cc sng mang c iu ch theo mt kiu no trn min thi gian lin tc.

Ty thuc vo kiu iu ch mi t hp bit trong chui bit u vo c gn cho mt tn s sng mang, v vy mi sng mang ch ti s lng bit c nh. V tr ca mi im tn hiu s phc trn biu chm sao phn nh thng tin v bin v pha ca cc sng mang. Qu trnh bin i IFFT s bin i cc s phc biu din cc sng mang trong min tn s thnh cc s phc biu din cc sng mang trong min thi gian ri rc.

Trong thc t, cc thnh phn Re v Im c biu din bng chui nh phn c b iu ch IQ s dng iu ch sng mang cng c biu din bng mt chui nh phn.

Qu trnh x l pha thu s thc hin bin i FFT to cc im iu ch phc ca tng sng mang ph trong symbol OFDM, sau khi gii nh x Demapping xc nh biu bit tng ng cc t hp bit c cng li khi phc dng d liu truyn. La chn iu ch c s Ti mi symbol, mi sng mang s c iu ch bi mt s phc ly t tp chm sao. Tuy nhin vi cng sut pht c nh, khi c nhiu bit d liu trong mt symbol th cc im trong chm sao cng gn nhau hn v kh nng chng li s b gim.

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Mi nhm bit ny mang. Trong m hnh iu ch phn cp, hai lung s liu c lp s c truyn trong cng mt thi im. C 4 khung lin tip to thnh mt siu khung.

L do vic to ra cc khung l phc v t chc mang thng tin tham s bn pht bng cc sng mang bo hiu tham s bn pht Transission Parameter Signalling TPS carriers. L do ca vic hnh thnh cc siu khung l chn va mt s nguyn ln gi m sa sai Reed-Solomin byte trong dng truyn ti MPEG-2 cho d ta chn bt k cu hnh thm s pht, iu ny trnh vic phi chn thm cc gi m khng cn thit.

Mi khung cha 68 symbol OFDM trong min thi gian c nh du t 0 n Phn b sng mang ca DVB-T cha chn khong bo v. Nh vy, trong mt symbol s cha: S lng cc sng mang d liu ny ch c vi 8K v vi 2K. Cc pilot ny c v tr c nh trong di tn 8MHz v c nh trong biu chm sao u thu sa li tn s, t ng iu chnh tn s AFC sa li pha. Chng khng c v t c nh trong min tn s, nhng c tri u trong di thng 8MHz. Bn my thu khi nhn c cc thng tin t cc pilot ny s t ng iu chnh t c p ng knh tt nht v thc hin vic hiu chnh nu cn.

Cc sng mang TPS ny khng nhng c v tr c nh trn biu chm sao, m cn hon ton c nh cc v tr xc nh trong di tn 8MHz. Khong bo v l thi gian thit b thu ch i, trc khi x l tn hiu. T g cng ln, khong cch ti a gia cc my pht hnh cng ln. Tuy nhin, v gc l thuyt thng tin, Tg c gi tr cng nh cng tt, bi l Tg l khong thi gian khng c s dng trong knh truyn. Tg ln s lm gim dung lng ca knh truyn. Mi khong symbol c ko di thm v th n s vt qu khong t hp ca my thu TU. Nh vy on thm vo ti phn u ca symbol to nn khong bo v s ging vi on c cng di ti cui symbol.

Min l tr khng vt qu on bo v, tt c thnh phn tn hiu trong khong t hp s n t cng mt symbol v tiu chun trc giao c tha mn. Vic chn khong thi gian bo v c thc hin ti pha pht. Khong thi gian bo v Tg c cc gi tr khc nhau theo quy nh ca DVB: Cc tia sng n trong khong thi gian bo v [5].

Khi chnh lch thi gian ca cc tia sng n u thu khng vt qu khong thi gian bo v Tg, th my thu hon ton khc phc tt hin tng phn x hnh 2. Thc cht, khong thi gian bo v T g l khong thi gian trng khng mang thng tin hu ch, v vy, cng ch pht, Tg cng ln, thng tin hu ch s cng t, s lng chng trnh s gim.

Nhng Tg cng ln kh nng khc phc cc tia sng phn x t xa n cng hiu qu. Vi s dng k thut ghp a tn trc giao v vi thng s khong thi gian bo v ny to tin cho vic thit lp mng n tn DVB-T. Cc my pht thuc mng n tn u pht cng mt knh sng, rt thun li cho quy hoch v tit kim ti nguyn tn s. Cc sng mang n l c truyn i ng thi bng phng php ghp knh phn chia tn s trc giao OFDM. Cc sng mang c iu ch s qua php nh x Mapping da trn c s biu chm sao constellation ca k thut iu ch s.

Php nh x thc hin gn cc gi tr symbol u vo ln cc im ca chm sao tng ng vi pha v ln ca cc vecto bao gm phn thc Real v phn o Image. Trong mi symbol l t hp ng thi ca gi tr iu ch trc giao I Inpha v Q Quadrature to nn im chm sao. Khi nh x Mapping thc hin tip ni theo sau khi m ha xon Convolutional Coder. Php nh x cn ph thuc cc mode truyn phn cp hoc khng phn cp Hierachical, NonHierachical c p dng cho vic truyn ghp knh a sng mang phn chia trc giao OFDM.

Tc l th tc m ha knh khng phn cp s khng phn bit cc bit c bit trong cc gi truyn MPEG-2 c nh x n nhng v tr c bit trong biu chm sao. D liu s c nh x vo nhng im ca chm soa khng u Nonuniform. Chm sao iu ch phn cp DVB-T [6]. Vic nh x dng bit trc tin p dng chm sao quay 4 Qam.

Gio pdf chi?u truy?n cu?n theo

Mi trng thi bin v pha ca chm sao 4 QAM xc nh gc phn t m sng mang chim gi trong chm sao. H s trong iu ch phn cp l t l gia khong cch ca 2 im gn nht ca 2 gc phn t cn k v khong cch gia 2 im gn nhau nht trong cng mt gc phn t ca chm sao.

H s cng ln th cng li cho iu ch HP nhng iu ch LP li chu nhiu km hn. N mang d liu cho php nhn c ngay khi iu kin truyn pht xu c nhiu cao hoc thu di ng. Hai dng c u tin khc nhau s cho vng ph sng khc nhau. M BCH m Bose, Chaudhuri v Hocquenhem l mt loi m sa li vng ngu nhin quan trng, c kh nng sa c nhiu li v c ng dng rt rng ri. B m R-S nhn mt khi thng tin ri thm vo cc bit d. Li xut hin trong khi truyn hoc lu tr c th do nhiu nguyn nhn nh tp m. Kh nng ny thng c gi l tng ch iu ch.

Khi thit lp mng n tn, tt c cc my pht thuc mng n tn u pht cng knh sng, rt thun li cho quy hoch v tit kim ti nguyn tn s. Mng n tn tun th 3 iu kin:. V ni dung, c ngha l ti bt k my pht no cng khng c lm mt tnh thng nht ca dng TS.

Hng ngn sng mang trong b iu ch s c to ra l do tn hiu ca dng TS sau khi chia nh ra c bin i Fourier ngc to nn. Nh vy, vic ng b cc dng TS cng ng ngha vi vic thc hin ng b tn s khu iu ch ca cc my pht. V vy, mng n tn hot ng hiu qu cn thc hin tt vic thit lp v hiu chnh ng b gia cc my pht Trong DVB-T cn p ng yu cu v khong phng v, m bo n cn phi gi khong cch gia cc my pht phi m bo cc iu kin khong bo v, tc l khng c vt khong cch cc i cho php vi nhau.

Trong mi trng thc t, chng ta ang chu hu qu ca hin tng phn x sng khi thu cc chng trnh truyn hnh. Sng ca my pht hnh s cng chu quy lut phn x, nhng do k thut ghp a tn trc giao v nh c thng s khong thi gian bo v ca DVB-T, nn cc thit b thu s DVB-T c th khc phc hiu qu hin tng thu phn x. Khong thi gian bo v T g c cc gi tr khc nhau theo quy nh ca DVB xem bng 2. Bng 2. Khong thi gian bo v cc ch pht khc nhau [5]. Khi chnh lch thi gian ca cc tia sng n u thu khng vt qu khong thi gian bo v Tg, th my thu hon ton c th khc phc tt hin tng phn x.

Truyn hnh s mt t c nhiu u im hn hn so vi cng ngh truyn hnh tng t. Nhu cu ngi xem truyn hnh ngy cng tng cao c v thi lng pht sng, cht lng chng trnh v cht lng hnh nh. Vi xu th hi t trong lnh vc a phng tin, v s pht trin mnh m ca cng ngh k thut truyn hnh cc dch v truyn hnh mi nh: Trc nhng nhu cu t ra trn, cui nm , nhng ni dung c bn ca tiu chun truyn hnh s mt t th h th hai DVB-T2 c ban hnh.

Do vy, DVB-T2 phi cho php s dng c cc anten thu hin ang tn ti mi gia nh v s dng li cc c s anten pht hin c. Vic trin khai v pht trin cc sn phm mi cho tiu chun mi ny cng bt u. Kh nng gia tng dung lng l mt trong nhng u im chnh ca DVB-T2. So snh vi chun truyn hnh s DVB-T. Hn na, tnh cnh tranh ca truyn hnh s mt t i vi cc mi trng truyn dn khc cng l yu t c bit quan trng phi xt n. Trong bi cnh c nhiu s cnh tranh t cc mi trng truyn dn khc cp, IPTV, v tinh , cuc ua v gia tng bng thng s khng kt thc v iu ny s dn n hnh thnh k thut truyn dn th h k tip u vit hn.

Hin nay, mi trng truyn dn v tnh v cp,. Do , DVB-T2 cng l s pht trin ph hp gip cho mi trng pht sng mt t co v tr cnh tranh tch cc so vi cc mi trng truyn dn khc. M hnh cu trc h thng DVB-T2 [7].. Khi ny c chc nng hon ton ging nhau i vi tt c cc tiu chun DVB. Tn hiu u ra cng c th c chia thnh hai ng cung cp cho anten th 2, thng l mt my pht khc. D liu u vo. DVB-T2 cn c mt s tnh cht mi gp phn ci thin cht lng h thng.

Ni cch khc, vic gia tng chu k symbol cho php gim kch thc khong bo v theo t l trong khi vn m bo s l cc phn x a hng Multipath Reflection Vic h tr thm mode m ha Alamouti l ty chn h tr thm kh nng thu sng trong mng SFN ni my thu c th thu c ng thi nhiu tn hiu t nhiu my pht. Trong tng lai, TFS dng cho ghp knh cc tn hiu tri rng thm mt vi tn s lin kt v do , gia tng ng k dung lng kt qu do ng dng ghp knh thng k v tng li thit lp mng. DVB-T2 cn cho php gn cc gi tr: Nh vy, my thu phi gi m 2 PLP ti cng mt thi im khi thu mt dch v: Hai mode u vo, do c nh ngha: Ngoi tin cy cao i vi cc dch v nht nh, mode B cn cho php khong tro thi gian di hn v tit kim nng lng hn i vi u thu.

Cc my thu dn. DVB-T2 cn s dng c bng tn 1. DVB-T2 c ty chn s dng k thut Alamouti m ha khng thi gian: Alamouti l mt v d ca MISO Multiple Input, Single Output , trong mi im ca th chm sao c truyn bi mt my, cn my pht th 2 truyn phin bn c chnh sa mt cht ca tng cp ca chm sao vi th t ngc li trn trc tn s.

Cc symbol ny truyn mt s lng hn ch cc thng tin bo hiu bng phng thc truyn c tin cy. Vi khong bo v c hai u, symbol P1 mang 7 bit thng tin bao gm kch thc FFT ca symbol d liu. Cc symbol P2, s lng c c nh cho mi kch thc FFT, cung cp thng tin bo hiu lp 1 k c tnh, ng v kh nng cu trc. Pilot phn tn c s dng nh gi s thay i trn ng truyn. Tro cn c thit k sao cho cc bit thng tin c truyn ti bi mt im xc nh trn th chm sao khng tng ng vi chui bit lin tc trong dng d liu gc. Tro thi gian cung cp thm kh nng chng li cc nh hng nh nhiu xung trong cc chu k thi gian v cc nh hng trong vng tn s gii hn ca tn hiu.

Hai k thut ny khng loi tr nhau v c kh nng s dng ng thi. Tuy nhin ACE khng c s dng vi chun xoay. Vic ny, mt mt lm tng can nhiu gia cc symbol v lm gim gii hn tn s cho php i vi hiu ng Doppler. Mt khc, chu k symbol di hn, cng c ngha l t l khong bo v nh hn i vi cng gi tr tuyt i ca khong bo v trn trc thi gian. Future-Extension Frame. S lng ti a ca khung T2 trong mt siu khung l khung v di ln nht ca n l ms, cng nh vy, di ln nht ca mt phn m rng FEF c cha trong siu khung l ms.

Nh vy, nhng khung - T2 c cha trong mt siu khung c th c di khc nhau ty thuc vo phn m rng FEF gn sau n. Khong thi gian gia 2 Symbol P1 ny l ms hnh 3. TP Supper Frame.

Cu?n theo chi?u gio pdf truy?n

Cu trc khung DVB-T2 [7]. Mc ch ca phn m rng FEF l kh nng kt hp linh hot cc dch v a ra trong chun DVB-T2 hin ti v phin bn cho tng lai, cc phn m rng ny c th mang d liu hoc khng mang d liu, theo khi thu nhn tn hiu DVB-T2 cng phi c kh nng d v x l chnh xc cc phn FEF ny trnh trng hp cc khung T2 b xo trn trong khi nhn c ti bt k thi gian no. MPEG-2 m ha mt dng video ngay c khi n cha ha v vn bn chng ln. MPEG-4 phn tch ha, vn bn chng ln thnh cc dng ring r v sau chng c hp li pha b gii m.

Khng ging nh cc chun MPEG trc , v d nh trong MPEG-2, ni m ni dung c to ra t nhiu ngun nh video, ha, vn bn v c t hp thnh chui cc khung hnh phng, mi khung hnh bao gm cc i tng nh ngi, vt, m thanh, nn khung hnh c chia thnh cc phn t nh pixels v x l ng thi, ging nh cm nhn ca con ngi thng qua cc gic quan trong thc t.

Cc pixels ny c m ha nh th tt c chng u l phn t nh video nh ng. Ti pha thu ca ngi s dng, qu trnh gii m din ra ngc li so vi qu trnh m ha khng kh khn. V vy c th coi MPEG-2 l mt cng c hin th tnh, v nu mt nh truyn thng pht li chng trnh ca mt nh truyn thng khc v mt s kin, th logo ca nh sn xut chng trnh ny khng th loi b c.

Vi MPEG-2, c th b sung thm cc phn t ha v vn bn vo chng trnh hin th cui cng theo phng thc chng lp , nhng khng th ca bt cc ha vn bn c trong chng trnh gc. Chun MPEG-4 khc phc c hn ch ny v l mt chun ng d thay i. Vi MPEG-4, cc i tng khc nhau trong mt khung hnh c th c m tar, m ha v truyn i mt cch ring bit n b gii m trong cc dng c bn ES Elementary Stream khc nhau. Cng nh xc nh, tch v x l ring cc i tng nh nhc nn, m thanh xa gn, vt, i tng nh video nh con ngi hay ng vt, nn khung hnh , nn ngi s dng c th loi b ring tng i tng khi khun hnh.

S t hp li thnh khung hnh ch c thc hin sau khi gii m cc i tng ny [4]. Nh hnh 3. S tng hp khung hnh trong MPEG-4 [4]. Cc thit b m ha v gii m video u p dng s m ha nh nhau cho mt i tng video VO Video Object ring bit, nh vy ngi s dng c th thc hin cc hot ng tng tc ring vi tng i tng thay i, di chuyn, kt ni, loi b, b sung cc i tng ngay ti v tr gii m hay m ha. Thc t tiu chun a ra vi 3 dy tc bit. Nhng profile v level khc trong MPEG4 cho php s dng tc bit ln n Ba c tnh rt quan trng ca MPEG-4 l: Tuy nhin, sc mnh tht s ca MPEG-4 l cc ng dng mi m c th xy dng da vo vic m ha c lp cc object cho hiu sut m cao hn, v vic tch ring cc object cho php tng tc cc object vi nhau c bit l cc chng trnh gio dc v cc tr chi.

V cng do kh nng tch bit cc object cn cnh quan trng nhng gim nh phng xung tc thp hn nu h thng s dng c bng thng b hn ch hoc thiu ti nguyn b nh, tc tnh.

Vi linh ng v hiu qu do m ha tng i tng video, MPEG-4 t yu cu ng dng cho cc dch v ni dung video c tnh tng tc v cc dch v truyn thng video trc tip hay lu tr. Trong MPEG-4, khung nh ca mt i tng video hay cn gi l mt phng i tng video c m ha ring l. V ngy nay th cng c nhiu b m thc hin gii m bng phn mm nhng b gii m bng phn mm c th b hn ch v kh nng linh hot. Can nhiu SFN do cc my pht to ra v c th kim sot c thng qua iu chnh tr my pht, cng sut pht hay bp hng anten pht. Theo l thuyt nu cc tn hiu n im thu c tr khc nhau v ln hn khong thi gian bo v ca mng n tn v hiu mc cng gia tn hiu chnh v tn hiu n tr nh hn ngng cho php th im thu s b can nhiu SFN.

Khong bo v v gi tr ngng i vi mc chnh lch cng thay i ty theo mode iu ch, t l m ha Trong khong bo v tng ng ca DVB-T2 c th hin di bng 3.

Bng 3. C rt nhiu cch chn cu hnh h thng khc nhau ty thuc vo mc ch ca tng nh mng m bo khong bo v, tc lung d liu, t s tn hiu trn nhiu Thng thng cc nh mng la chn tc yu cu i vi lung d liu sau hiu chnh cc thng s khc ca mng nhu kch thc FFT, khong bo v, t l m ha 3.

Khi thi gian quan st tin n v hn th t s ny tin n xc sut li bit. Trong thc t, thi gian quan st khng phi l v hn nn t s li bit ch gn bng vi xc sut li bit. Ngc li, BER ln th cht lng dch v s km. Khi cc tham s pht v truyn dn nh nhau th BER ph thuc vo kiu iu ch. Sau khi nh v, chm sao c xoay mt gc trn mt phng I-Q nh m t trn hnh 3.

Cc thnh phn I v Q c tch bi qu trnh tro sao cho chng c truyn trn min tn s v thi gian khc nhau. Nu c mt thnh phn b hy hoi trn knh truyn, thnh phn cn li c th c s dng ti to li thng tin. K thut ny trnh c mt mt trn knh Gauss v to c li 0. Thnh tch ca chm sao quay so vi khng quay [7]. Cc chm sao quay cung cp kh nng chng li s suy hao ca cc cell d liu mt cch ng k bng cch m bo vic mt thng tin t mt knh thnh phn c th c khi phc t mt knh thnh phn khc. Cc thnh phn I v Q c gi nhng thi im khc nhau trn cc cell khc nhau m bo khi phc c thng tin khi xy ra li.

Cc m ny cho php kh nng bo v tt hn, truyn nhiu d liu hn trn cng mt knh thng tin.

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So vi chun DVB-T, cc mode sng mang mi c cng thm ci thin cc ch tiu k thut. Bng 4. Chnh v nhng u im vt tri ca truyn hnh s m hu ht cc nc trn th gii trong c Vit Nam a ra l trnh s ha truyn hnh s mt t v ngng pht sng truyn hnh tng t. Mc tiu ca qu trnh s ha: Truyn hnh s qung b mt t pht trin rng khp cc tnh thnh trong c nc v ngy cng c nhiu nh cung cp dch v truyn hnh s qung b vi s lng chng trnh ngy mt tng.

Vi nhng rng buc v gii hn bng tn, mi trng truyn hnh mt t cn c mt h thng truyn dn mi hiu qu hn dp. S pht trin ca DVB-T2 minh chng cho s tin tng vo cng ngh qung b trn mi trng truyn hnh mt t. Vic pht trin tiu chun truyn hnh s mt t th h th hai p ng c yu cu thc t. Hin nay, Vit Nam thnh cng trong vic ng dng truyn hnh s mt t theo tiu chun DVB-T2, cng ngh truyn hnh tin tin nht th gii trong truyn dn v ph sng truyn hnh trn c nc.

Cc tham s pht sng ca truyn hnh An Vin c th hin nh bng 4. Hnh 4. H thng bao gm: Bao gm cc knh truyn hnh do AVG t sn xut v cc ngun chng trnh khc. Thc hin phn phi cc tn hiu t u ra Headend n cc trm pht sng. Cc trm pht sng c trin khai trn phm vi c nc, vi 3 knh tn s ti mi trm s c 3 my pht sng DVB-T2, cng sut my pht di 3kW.

Bn ph sng ca truyn hnh An Vin c th hin nh hnh 4. VTC ph sng trn 47 tnh, thnh ph vi gn 30 knh chng trnh khng thu ph phc v nhim v chnh tr, thng tin tuyn truyn thit yu ca Trung ng v a phng, phc v hn 4 triu h dn. Sau , VTV s trin khai s ha tip tc n cc tnh thuc cc khu vc khc tin ti s ha ton quc vo nm Cc tham s pht sng ca i truyn hnh Vit Nam c th hin trong bng 4. Vic pht trin tiu chun truyn hnh s mt t DVB-T2 p ng c nhu cu thc t.

Qua y, em xin gi li cm n chn thnh v su sc nht n ton th cc thy c trong b mn, trong Khoa in - in t v c bit l TS Nguyn Cnh Minh gip em hon thnh n ny. Mc d em rt c gng, nhng do thi gian c hn v trnh kin thc cn hn ch nn khng th trnh khi nhng thiu st. Knh mong cc thy c v cc bn ng gp kin em c th hon thin hn. Em xin chn thnh cm n! Ti liu Ting Vit [1]. B thng tin v truyn thng , n s ha truyn dn pht sng truyn hnh mt t n nm Ti liu Ting Anh [6].

Digital broadcasting system for television, sound and data services; Framing structure, channel coding and modulation fos digital terrestrial television DVB-T. Marcelo S. Flag for inappropriate content.

1560 câu Toeic có giải thích.pdf

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This Changes Everything: Capitalism vs. The Climate. The Emperor of All Maladies: A Biography of Cancer. Jump to Page. Search inside document. T GVHD: Ngay t u nhng nm , ngi ta ch n truyn hnh do h nhn thc c vai tr ca GVHD: Cc dng c sang GVHD: Qu trnh gii m tn hiu truyn hnh thc hin bin i tn hiu truyn GVHD: Tn hiu truyn hnh tng t l hm lin tc theo thi gian v t khu to dng, truyn dn, pht sng n khu thu tn hiu u chu GVHD: Cht lng Tn hiu s Tn hiu tng t Khong cch gia my pht v my thu Hnh 1.

Lc GVHD: Ly mu l bc u tin th hin tn GVHD: Trong hu GVHD: Tuy nhin phng thc ny cn tn ti nhiu nhc im: Phng thc ny cng cn mt s nhc im nh: Nu truyn hnh qua v GVHD: Trn th gii c 5 nhm tiu chun truyn hnh s chnh: Bn phm vi ng dng cc tiu chun truyn hnh s trn th gii [10]. Cc byte ng b v cc byte d liu ngu nhin ha.

Mi nhm bit ny mang GVHD: Sng mang d liu Hnh 2. Phn b cc pilot ca DVB-T trn biu chm sao [5]. Mng n tn tun th 3 iu kin: Hin nay, mi trng truyn dn v tnh v cp, GVHD: Tn hiu u vo SS1: BasicGateway SS3: B iu ch T2 SS4: B gii iu ch SS5: Tn hiu ra Hnh 3.

Lp vt l. Cc my thu dn GVHD: Ldata-1 Hnh 3. T2Gateway Hnh 3. Chm sao 16 QAM quay. Vi nhng rng buc v gii hn bng tn, mi trng truyn hnh mt t cn c mt h thng truyn dn mi hiu qu hn dp GVHD: Cc tham s pht sng ca truyn hnh An Vin [12].

Sinh vi6rr clu. I nlAi-tong. Iloc phiin B lii hoc ph0n song hAnh d6i vcii hoc phdn A. Tin chi TC ld do'n vi dirng dd do kh6i lu'ong ki6n thil'c trong chucrng trinh ddo rao. C0'30 ti6t thao ludn, bdi tdp, rhp. Mri'c hoc phi do Fli6u tru'r5'ng quy dinh clro tilng bAc hoc vA tilng h0 drio tao theo tlng ndm hoc cri cluy dinh rieng.

Cnc hQ ddro t4o vA thcri gian dio t4o I. Tltdi gian crta kh6o itdo tgo a. Ciic hoc kj' du'gc phdp tam dirng hoc vd cdc hoc kj, hoc o'truong khac tru6'c khi chuy6n vd 'l'ru'o'ng Eai hoc cdng nghigp TP Ho chf Minh cldu duo-c tfnh chung vdo rho'i gian t6i da ndy.

Dt, D tfnh rir dA; khoa hoc 3' Vi dlt: Trong kh6a hoc sinh vi6n dd hoc 24hoc phdn tinh d6n thoi diem dang hoc. Nh1ng rru. Didu 7' T6 chric l6p hgc: Di6u 8. Didu 9. Ding ky khiii tuqng hgc tip t' Cudi nim hoc, Phdng Ddo t? Tu hoc k! Trud'ng hqp kh6 khdn khoa kh6ng tru'c ti6p giai quy6iduo..

Didu Di6u N6u sau cl6 sinh vi6n thi ddu vdo m6t ngdnh hoc kh6c c6 hoc phan d6 thi k6t qu6 s6 cluoc bio luu. L I Didu Nghi tim! Diiu X6p hlng nim ttio t4o vi hgc tuc Sau m6i hoc kj', c6n cri vAo kh6i lugng ki6n thfc tfch lfry, SV duo-c xtip hang n6m ddo tao nhu. N6u c6 rli6m trung binh rich lu! N6u c6 ditim trung binh tich lu! Tho'i gian nghi hoc tam tho'i vi nhu cAu cii nhdn phdi duoc rfnh vdo tho.

Eidu Cfrnh brio kdt qui hqc t? BuQc thbi hpc.: Sau m6i ndm hoc, sinh vi6n bi buQc thdi hoc n6u ro'i vdo mdt trong ciic trud. I - vuqt qu6 thoi gian duoc phdp hQc rai trudng nhu quy dinh tqi di6u a cria euy ch6 ndy. Chuy6n trudng l. Sinh vi6n kh6ng phdp chuydn truong trong cAc truong cluo. Thri gian c6 giri tri kh6ng quri thoi gian da tluoc ph6p hoc tai trudng tiiy theo tirng b6c t6i hoc.

Ddnh gi: I - DAi vti hgc phin ljt thuydt - D. Di6m t6ng k6t hoc phAn - D. Ghi chrt A.