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MessagePosté le: Mer 5 Oct - 16:13 (2016)    Sujet du message: Cdma Tdma Cdma Pdf Free Répondre en citant




Cdma Tdma Cdma Pdf Free > shorl.com/kanohurolyvi











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For,example,,binary,string,1011,is,represented,by,the,vector,(1,,0,,1,,1).,Step,,,Decode,,,sender0,,,Decode,,,sender1,,,0,,,code0,,,=,,,(1,,,,1),,,,signal,,,=,,,(0,,,,2,,,,2,,,,0,,,,2,,,,0,,,,2,,,,0),,,code1,,,=,,,(1,,,,1),,,,signal,,,=,,,(0,,,,2,,,,2,,,,0,,,,2,,,,0,,,,2,,,,0),,,1,,,decode0,,,=,,,pattern.vector0,,,decode1,,,=,,,pattern.vector1,,,2,,,decode0,,,=,,,((0,,,,2),,,,(2,,,,0),,,,(2,,,,0),,,,(2,,,,0)).(1,,,,1),,,decode1,,,=,,,((0,,,,2),,,,(2,,,,0),,,,(2,,,,0),,,,(2,,,,0)).(1,,,,1),,,3,,,decode0,,,=,,,((0,,,+,,,2),,,,(2,,,+,,,0),,,,(2,,,+,,,0),,,,(2,,,+,,,0)),,,decode1,,,=,,,((0,,,,,,2),,,,(2,,,+,,,0),,,,(2,,,+,,,0),,,,(2,,,+,,,0)),,,4,,,data0=(2,,,,2,,,,2,,,,2),,,,meaning,,,(1,,,,0,,,,1,,,,1),,,data1=(2,,,,2,,,,2,,,,2),,,,meaning,,,(0,,,,0,,,,1,,,,1),,,.,,,The,,key,,difference,,here,,is,,that,,the,,bit,,error,,probability,,for,,N,,users,,talking,,all,,of,,the,,time,,is,,constant,,,whereas,,it,,is,,a,,random,,quantity,,(with,,the,,same,,mean),,for,,2N,,users,,talking,,half,,of,,the,,time.,,These,,vectors,,will,,be,,assigned,,to,,individual,,users,,and,,are,,called,,the,,code,,,chip,,code,,,or,,chipping,,code.,,However,,,,spread,,,spectrum,,,techniques,,,use,,,a,,,transmission,,,bandwidth,,,that,,,is,,,several,,,orders,,,of,,,magnitude,,,greater,,,than,,,the,,,minimum,,,required,,,signal,,,bandwidth.,,,^,,,a,,,b,,,Harte,,,,Levine,,,,Kikta,,,,Lawrence,,,,Richard,,,,Romans,,,(2002).,,,LK-1,,has,,a,,weight,,of,,3kg,,,2030km,,operating,,distance,,,and,,2030,,hours,,of,,battery,,life.[3][4],,The,,base,,station,,,as,,described,,by,,the,,author,,,could,,serve,,several,,customers.,,History[edit].,,,Wikimedia,,Commons,,has,,media,,related,,to,,CDMA.,,The,,technology,,of,,code,,division,,multiple,,access,,channels,,has,,long,,been,,known.,,

CDMA,,is,,an,,example,,of,,multiple,,access,,,where,,several,,transmitters,,can,,send,,information,,simultaneously,,over,,a,,single,,communication,,channel.,,Skylar,,,,Bernard,,,,Digital,,,Communications,,,,2nd,,,Edition,,,,Prentice,,,Hall,,,,2001.,,,The,,,eight,,,time,,,slots,,,can,,,be,,,voice,,,signals,,,or,,,data,,,such,,,as,,,texts,,,or,,,e-mails.,,,Cell,,sites,,are,,spaced,,from,,one,,another,,to,,minimize,,interference.,,In,,,a,,,bursty,,,traffic,,,environment,,,like,,,mobile,,,telephony,,,,the,,,advantage,,,afforded,,,by,,,asynchronous,,,CDMA,,,is,,,that,,,the,,,performance,,,(bit,,,error,,,rate),,,is,,,allowed,,,to,,,fluctuate,,,randomly,,,,with,,,an,,,average,,,value,,,determined,,,by,,,the,,,number,,,of,,,users,,,times,,,the,,,percentage,,,of,,,utilization.,,,The,signals,won’t,interfere,with,one,another,even,if,they’re,on,the,same,frequency,because,they’re,orthogonal,and,the,antennas,won’t,respond,to,the,oppositely,polarized,signal.,Suppose,there,are,2N,users,that,only,talk,half,of,the,time,,then,2N,users,can,be,accommodated,with,the,same,average,bit,error,probability,as,N,users,that,talk,all,of,the,time.,There,is,no,strict,limit,to,the,number,of,users,that,can,be,supported,in,an,asynchronous,CDMA,system,,only,a,practical,limit,governed,by,the,desired,bit,error,probability,,since,the,SIR,(Signal,to,Interference,Ratio),varies,inversely,with,the,number,of,users.,If,,the,,code,,is,,correlated,,with,,the,,signal,,at,,any,,time,,offset,,other,,than,,zero,,,the,,correlation,,should,,be,,as,,close,,to,,zero,,as,,possible.,,

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