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1、Proceedingsofthe2011IEEEInternationalConferenceonCyberTechnologyinAutomation,Control,andIntelligentSystemsMarch20-23,2011,Kunming,ChinaDesignofASpreadSpectrumCommunicationSystemBasedonDSPHuangHeZhaoChunhuiInstituteofControl&InformationInstituteofControl&InformationNorthwesternPolytechni
2、calUniversityNorthwesternPolytechnicalUniversityXi’an,ChinaXi’an,Chinahuanghe@nwpu.edu.cnzhaochunhui@nwpu.edu.cnLiangYanPanQuanInstituteofControl&InformationInstituteofControl&InformationNorthwesternPolytechnicalUniversityNorthwesternPolytechnicalUniversityXi’an,ChinaXi’an,Chinaliangyan
3、@nwpu.edu.cnquanpan@nwpu.edu.cnAbstract—DirectsequencespreadspectrumtechnologyisapplieddrivethebasebandchipHFA3824AandthePLLchipwidelyinwirelesscommunicationbecauseofitsmerits,suchasHFA3524.anti-interferenceability,goodconcealment,andbeingeasytorealizeCodeDivisionMultipleAccess.ADirects
4、equencespreadThetechnicalindexofthewholecircusisasfollows.spectrumcommunicationsystembasedonDSPisdesignedinthe1)WorkingvoltageVcc:4.5-5Vpaper,includingbasebandprocessor,intermediatefrequency2)Meanworkingcurrent:220mAmodulator/demodulator,localoscillator,up/downconverter,3)Symbolchiprate
5、:156.25kbps.keyboard,LCDmonitorandDSPcontroller,etc.Theexperiment4)PNcodechiprate:2.5Mcpsresultsoftransmissionshowsthatthedirectsequencespread5)Intermediatefrequency:280MHzspectrumsystemdesignedcanobtainspectrumafterIF6)Processinggain:G:>15dBmodulationwith40dBmpeakleveland20MHzbandwidth
6、in4dBmleveltomeetssystemrequirements.Anditcanrealizeeffectivedatatransmissionandanti-interferencecommunicationwithadvantagesofhigherdatatransmissionrateandwiderspectrumrangethanthetraditionalcircuits.Keywords-spreadspectrumcommunication;baseband;wirelesscommunication;intermediatefrequen
7、cy.I.INTRODUCTIONSpreadspectrumcommunicationhasadvantagesofstronganti-interferenceability,goodsecurity,high-speedrate,beingeasytorealizeCDMAandlessinterferencetoothernarrowbandsystemsinthesameband.Withitsdevelopmentthetechnologyisusedinanti-interferencecommunication[1,3-5],elec
