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7/25/2019 Multiplexing and Multiple Access
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Presentation By SANIA GUL 1
MULTIPLE ACCESS
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Presentation By SANIA GUL 2
Multiple Access
An access networkis that part of acounications net!or" !hichconnects su#scri#ers to theirie$iate ser%ice pro%i$er&
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Presentation By SANIA GUL '
Multiple access etho$s
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Presentation By SANIA GUL (
Multiple)in* is sharin* of resources onlin"s insi$e the net!or" i&e& corenet!or"& +The lin"s #et!een the
net!or" eleents +NEs, of ser%icepro%i$er or #et!een t!o ser%icepro%i$ers,
Multiple Access is sharin* of resourceson the access part of the net!or"&
erence et!eenultiple)in* / ultiple
Access
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Presentation By SANIA GUL 0
-i.erence #et!eenultiple)in* / ultiple Access
The ain $i.erence #et!een T-M an$T-MA +also -M-MA3 etc, is that !ithT-M +also -M3 etc&, the si*nals
ultiple)e$ +i&e& sharin* a resource,coe fro the sae no$e3 !hereas forT-MA +also -MA3 etc&, the si*nalsultiple)e$ coe fro $i.erentsourcestransitters&
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Presentation By SANIA GUL 4
Multiple)in* 5s& ultipleAccess
MULTIPLE6ING +$ial upinternet,
Multiple Access+satelliteinternet,
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Presentation By SANIA GUL 7
T!o !ay counication
1& In#oun$ or for!ar$ lin"
The counication lin" fro thesu#scri#er to the ser%ice pro%i$er%ia satellite&
2& 8ut#oun$ or re%erse lin"
The counication lin" fro theser%ice pro%i$er to the su#scri#er%ia satellite&
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Presentation By SANIA GUL 9
T!o !ay counication
::::: in#oun$ lin"
8ut #oun$ lin"
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Presentation By SANIA GUL ;
re
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Presentation By SANIA GUL 1?
Intero$ulation
It is the un!ante$ aplitu$eo$ulation of si*nals containin* t!o orore $i.erent fre
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Presentation By SANIA GUL 11
Intero$ulation
Suppose ' carriers are carryin* three $i.erentsi*nals in -MA o$e / pass throu*h @PA oftranspon$er& 8ne carrier is at 1 M@3 secon$ at2 M@ / thir$ at ' M@ & -ue to non linear
properties of @PA the 1 / 2 M@ fre
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Presentation By SANIA GUL 12
Sat phone usin* -MA
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Presentation By SANIA GUL 1(
5SAT usin* -MA3T-MA orC-MA
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Presentation By SANIA GUL 10
T-MA rae
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Presentation By SANIA GUL 14
TDMA burst time plan.
VSAT site 1 start 0 mS, time allocated 180 mSVSAT site 2 start 200 mS, time allocated 80 mSVSAT site 3 start 300 mS, time allocated 180 mSVSAT site 4 start 500 mS, time allocated 280 mSVSAT site 5 start 800 mS, time allocated 180 mS
This information is broadcast to all sites, which then followthe timing instrctions! This brst time "lan might be
a""lied nchanged for se#eral da$s or wee%s or it might bechanged e#er$ few seconds or mintes according to thetraffic demand!
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Presentation By SANIA GUL 17
T-MASatellite Internet usin* 5SAT
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Presentation By SANIA GUL 19
Co$e $i%ision ultipleaccess+C-MA,
All users transit at the saefre
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Presentation By SANIA GUL 1;
C-MAGPS na%i*ation syste in Car
Police
station
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Presentation By SANIA GUL 2?
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Presentation By SANIA GUL 21
5SAT in#oun$ options
-MAD
Lo!est cost since the B> an$ transitpo!er re
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Presentation By SANIA GUL 22
5SAT in#oun$ options
T-MA
More cost $ue to hi*h transitterpo!er re to user& It is !i$ely use$ fora$%ance$ ultie$ia traFc&
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Presentation By SANIA GUL 2'
5SAT in#oun$ T-MA lin"
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Presentation By SANIA GUL 2(
5SAT 8ut#oun$ T-M lin"
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Presentation By SANIA GUL 20
5SAT in#oun$ options
C-MA
Less B> eFcient than T-MA / -MA&It is use$ in such cases !here thechances of interference fro otherEarth stations are %ery hi*h& It is!i$ely use$ for ilitary applications&