performance of simulink based SS-OFDM model for broadband wireless access network

《performance of simulink based SS-OFDM model for broadband wireless access network》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、SecondInternationalConferenceonEmergingTrendsinEngineeringandTechnology,ICETET-09PerformanceofSimulinkbasedSS-OFDMmodelforBroadbandWirelessAccessNetworkUmeshP.AkareSudhirB.LandeSureshBalpandeLaxmanP.ThakreDigitalElectronicsElectronics&TeleElectronics&TeleElectronics&Tele.RCETRCETRCE

2、TRCETBhilai,IndiaBhilai,IndiaBhilai,IndiaBhilai,Indiauakare@rediffmail.comlanded@yahoo.co.insbalpande@yahoo.cometrcet@yahoo.comAbstract—OrthogonalFrequencyDivisionMultiplexinginducedbytheinterferencessufficientlylow[2].Incaseof(OFDM)hasemergedasapotentialapplicationfortheSS-OFDMitis

3、observedthat1)Spreadingovertheentiredeliveryofbroadbandwirelessaccess.BothDSandFHbandwidthmitigatestheeffectofspectralnulls2)GuardsystemsreducetheaveragepowerspectraldensityofasignalintervalsarenotusedbecausethespreadingoftheOFDMandaffectsbybroadbandnoise.Narrowbandinterferencewould

4、leadtoadditionalinterference3)useofcyclicprefiximpactsseverelyonanFHsignalthanaDSsignalonthesameeliminatesintersymbolinterference4)combinationofchannel.ThecombinationofOFDMwithDirectSequenceorthogonalandpseudo-noisespreadinghelpstomitigateSpreadSpectrum(DS-SS)resultinginSS-OFDM,issu

5、itableforthedesignofamulti-usersystem,robustagainstchannelintercellinterferenceincellularenvironment[3].Thereareimpairments.WehavesimulatedtheSS-OFDMmodelwithnumberofmethodsofspreadingfrequencyspectruminBPSK,QPSK,8-PSK,16-PSK,64-PSKand8-QAM,16-QAM,spreadspectrumcommunicationsystems.

6、Basically,these64-QAMmodulationtechniques.SimulationresultsforSS-methodsincludeDirectSequenceSpreadSpectrum(DS-OFDMwithBPSKmodulationisfoundsuitableforshortSS),FrequencyHoppingSpreadSpectrum(FH-SS),Timedistancecommunicationwhereas8-PSKmodulationcanbeHoppingSpreadSpectrum(TH-SS),andc

7、ombinationsofusedforlongdistancecommunication.ButwerecommendM-thesemethods.MultibandOrthogonalFrequencyDivisionQAMmodulationforSS-OFDMsinceitgivesremarkableMultiplexing(MB-OFDM)isaschemeofmulticarrierimprovementinBERascomparedtoM-PSK.transmissionforultra-wideband(UWB)communicationwh

8、ichemploysthefreque