SCPC
SCPC isis cucurrerrentntlyly proprovidvideded ininthth babandnd -M-M chchanannene di
divividede inin -k-k ananalal eaeachch dededidicacatete toto sisi plplexex VFVF link,link,
us
usinin FMFM ThereThere isis alalsoso didigigitata SCSCPCPC ususinin QPSQPSK,K, whwhichich provprovideide 6464-k-kbpbp serservivicece
in
in thth sasameme 4545-k-k babandndwiwidtdth,h, enenououghgh fofo didigigi izizeded WiWithth FAMAFAMA pairspairs ofof
ch
chanannenels ls fofo duduplplex ex arar asassisigngneded toto pairspairs ofof earthearth statstations.ions. TyTypipicacalllly,y, eacheach earth
earth stationstation isis mulmultiptiplexlexed,ed, suppsupportiortingng smsmalal numnumberber ofofuseruser ststatatioions.Withns.With mumull
ti
tiplpl ususerer ststatatioionsnspepe eaeartrt ststatatioion,n, hihighgh degdegreeree ofof coconnnnecectitivivityty isis achiachieveeve eveneven wi
withth FAMFAMA.A. AsAs wiwithth conconvenventitionaona FDMAFDMA thth satsatellellitit accaccepeptsts freqfrequenuenciecie acacrorossss th
th ententireire 3636-M-MHzHz chchanannenel,l, tratranslnslateate 4 4 band,band, anan broadcastsbroadcasts
th
th channelchannel toto alal statstations.ions. SCPC
SCPC isis atattrtracactitiveve fofo remoteremote rere erer sese nearnear
eac
eac WheWhereasreasFDMAFDMA isis usus truntrun thth long-halong-haulul telectelecommunommunii
cat
cationion sysyststemem SCPSCP proprovividesdes didirerectct endend-us-userer seservrv cece AltAlthoughoug SCPCSCPC isis moremore effieffi
than
than FDMAFDMA
assignme
assignment.nt. ThiThi isis esespepecicialallyly unsunsuituitablabl inin veveryry remoremotete arareaeas,s, whewherere itit isis typicaltypical thatthat
each
each earthearth ststatatioio seservrv onon oror erer ususerer chch evev grgreaeatete ciency,
ciency,DAMADAMA isis useused.d. WiWithth DAMADAMA hehe sese ofof susubcbchahannnnelel inin chchanannene isis treatedtreated
po
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CHAPTER
CHAPTER COMMUNICATIONSCOMMUNICATIONS
36
36 MHzMHz banbandwidwidthdth Commo
Commo signsignalingaling cha
channnnel el CSCCSC
QPSK QPSK signals
signals 9 9 400400-40-403 3 unuunused)sed)
800 800
a)
a)FrequencyFrequencyallocationallocation
To Tosatellitesatellite QPSK QPSK QPSK QPSK signalsignal transmitter transmitter PC PC PC PC PC PC 64kbps64kbps encoder encoder 0
0toto kHkHz,z, ananaloalog)g) PCPC 6464kbpskbps signalsignal
encoder
encoder transmittertransmitter
Telephone
TelephoneVFVFsignalsignal Tel
Telephephoneone VFVF sigsignalnal
0
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c/\PACITY
c/\PACITY ALLOCATION TIMEALLOCATION TIME DIVISIONDIVISION 2525
Guard Guard time time Carrier Carrier anan b b Coordina-Coordina- data data recovery recovery r a m e r a m e p e r i op e r i o Station Station Reference
Referenceburstburst StationStation data data bursburs
Carrier
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\:
\: TransmissionTransmission fr
fromom stastationtion
\\ \\ \/ \/ >.>. nt nterer nrnrstst guard
guardtimetime ,,,,
Frame Frame
I
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9
9 C,J\PACITYC,J\PACITYALLOCATlON TIlVIEDIVISIONALLOCATlON TIlVIEDIVISION 2525
1 0 0 0 1 0 0 0 750 LS 750 LSTDMATDMA 90 90 SCPC SCPC I I . . . ; ; ; ; . . . ; ; ; ; _ ~ _ ~ 750 750
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0 1 0 1
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bl
bl SSSS TDTD dedes s ththrere
RECOMMENDED
RECOMMENDED RE DINGSRE DINGS WEWE SITESSITES 261261
Mo Modede Output Output Mo Modede odel odel nput nput
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CHAPTER
CHAPTER COMMUNICATIONSCOMMUNICATIONS
ReCOlTInlended
ReCOlTInlended SitesSites
An
An excexcellellentent ovovererviviewew ofof satsatellelliteite cocommmmununicaicatitionons,s, wi
withth lolotsts ofof lilinknks.s. Sa
Sateltellitlit InInduduststryry AssAssociociatiation:on:Trad orgaTrad organizanizationtion represrepresentinentin spspacac andand cocommmmuu ni
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9