Multiplexing and Multiple Access

7/25/2019 Multiplexing and Multiple Access

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Presentation By SANIA GUL 1

MULTIPLE ACCESS


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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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-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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Multiple)in* 5s& ultipleAccess

MULTIPLE6ING +$ial upinternet,

Multiple Access+satelliteinternet,


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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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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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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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Sat phone usin* -MA


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Presentation By SANIA GUL 1(

5SAT usin* -MA3T-MA orC-MA


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T-MA rae


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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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T-MASatellite Internet usin* 5SAT


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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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5SAT in#oun$ options

-MAD

Lo!est cost since the B> an$ transitpo!er re


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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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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&

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Multiplexing and Multiple Access