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MN HC THNG TIN V TINH

Chng 3:

Cc k thut truyn dn cho mt knh v t(h thng n truy nhp) (5t) Thuyt trnh v tho lun

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Chng 3: Cc k thut truyn

dn cho mt knh v tinh 3.1 Cc c tnh ca tn hiu trong TTVT

3.2 M hnh knh

3.3 Cc ch tiu nh gi cht lng hthng truyn dn

3.4 K thut truyn dn tng t

3.5 K thut truyn dn s

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Cc c tnh ca tn hiu trong

TTVTCc loi tn hiu bng gc:

Thoi Truyn hnh Pht thanh qung b D liu

Xem ti liuG.Maral, M.Bousquet, SatelliteCommunications Systems , (P71-77)

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Chng 3: Cc k thut truyn

dn cho mt knh v tinh 3.1 Cc c tnh ca tn hiu trong TTVT

3.2 M hnh knh

3.3 Cc ch tiu nh gi cht lng hthng truyn dn

3.4 K thut truyn dn tng t

3.5 K thut truyn dn s

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M hnh knhC hai m hnh:

Kt ni thng qua mng mt t Kt ni trc tip (VSAT)

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M hnh knh:

Thng qua mng mt t

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M hnh knh:

Kt ni trc tip

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Chng 3: Cc k thut truyn

dn cho mt knh v tinh 3.1 Cc c tnh ca tn hiu trong TTVT

3.2 M hnh knh

3.3 Cc ch tiu nh gi cht lng hthng truyn dn

3.4 K thut truyn dn tng t

3.5 K thut truyn dn s

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Cc ch tiu nh gi cht lng

h thng truyn dn ITU-R (CCIR) quy nh cc ch tiu nh gi chtlng ca h thng

Ty vo bn cht ca tn hiu c truyn dn (thoi, Tpht thanh, data)

Cht lng ca tn hiu thu c ti ngi dngc nh ngha ti giao tip

Mng / trm Cho kt ni thng quan mng mt t

u cui / trmCho kt ni trc tip

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Cc ch tiu nh gi cht lng

h thng truyn dn Cc ch tiu ny bao gm: S/N:

Cng sut tn hiu bng gc / cng sut tp m Khi tn hiu tng t

BER: khi tn hiu s C hai ch tiu ny ph thuc vo (C/N0)TXem chi tit cc tiu chun ny trong ti liuG.Maral,M.Bousquet, Satellite Communications Systems ,(P80-82)

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Chng 3: Cc k thut truyn

dn cho mt knh v tinh 3.1 Cc c tnh ca tn hiu trong TTVT

3.2 M hnh knh

3.3 Cc ch tiu nh gi cht lng hthng truyn dn

3.4 K thut truyn dn tng t

3.5 K thut truyn dn s

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K thut truyn dn tng t X l bng gc: Thoi: tch cc thoi, tin nhn v gii tin nhn, nn vnn

Video: tin nhn v gii tin nhn Ghp knh: FDMiu ch: AM, FM, Truyn dn thoi: SCPC/FM, FDM/FM Truyn dn TV: SCPC/FM, FDM/FM Xem ti liu:G.Maral, M.Bousquet, SatelliteCommunications Systems ,(P85-P99)

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Chng 3: Cc k thut truyn

dn cho mt knh v tinh 3.1 Cc c tnh ca tn hiu trong TTVT

3.2 M hnh knh

3.3 Cc ch tiu nh gi cht lng hthng truyn dn

3.4 K thut truyn dn tng t

3.5 K thut truyn dn s

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K thut truyn dn s

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K thut truyn dn s A/DTDM

K thut ni suy ting ni ng b gia cc mng M ha bo mt M ha knh (chng nhiu)

Gii m v sa li iu ch s

Gii iu ch

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K thut truyn dn s K thut ni suy ting ni

(digital Speech Interpolation-DSI)H s tch cc thoi: 35%- 40%S dng b m ha t bit thp (thoi: 32 kbit/s)

H thng Intelsat/Eutelsat:m/n = 240/127 = 1.9

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K thut truyn dn s ng b gia cc mng

Do s di chuyn ca cc v tinh trong qu o ca n Hiu ng Doppler xut hin Tc bit thu c khng bng tc bit c pht i

ng h ti cc mng mt t khng hon ton ng b Gii php:

S dng cc b nh m ti cc giao tip mng/trm

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K thut truyn dn s M ha bo mt:

Mi trng v tuynd b thm nhp

Cn bo mt thng tin