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基于预编码设计的OFDM系统载频间干扰抑制.pdf

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http://www.paper.edu.cn GeneralPrecoderDesignforMitigationof IntercarrierInterferenceinOFDM 1 MobileSystems XiaWang*ShihuaZhu SchoolofElectronicsandInformationEngineeringSchoolofElectronicsandInformationEngineering Xi’anJiaotongUniversity,Xi’anJiaotongUniversity, Xi’an,P.R.China710049Xi’an,P.R.China710049 wangxia@mail.xjtu.edu.cnszhu@mail.xjtu.edu.cn Abstract Fororthogonalfrequency-divisionmultiplexing(OFDM)communicationsystems, thefrequencyoffsetinmobileradiochannelsdistorttheorthogonalitybetween subcarriers,whichresultsinIntercarrierInterference(ICI)andseriouslydegradesthe performanceofsystems.Inthispaper,basedonICIcoefficientsanalysis,anovel precoderdesignschemeisproposedformitigationofICIinOFDMmobilesystems.In thistechnique,precodermatrixisdesignedbythewayoflinearcombination, counteractionandinsertedintheformeroftransmittersignal,thereceivedsignalscan belinearrecoveredwithoutbandwidthefficiencyreduced.BERperformancesare analyzedfortheproposedscheme.Computersimulationresultsshowthatthisnew schemecaneffectivelyreduceICIandsignificantlyprovidethecarrier-interference powerratioimprovement.ComparedwithexistingICImitigationschemeswith channelestimation,theproposedschemehaslowercomputationalcomplexity,and comparedwithself-cancellationscheme,thebandwidthefficiencycanbeimprovedin thisproposedscheme.Theproposedschemehasalsobetterconvergencestabilityfor time-varyingfrequencyselectivefadingchannel. Keywords:IntercarrierInterference,precoder,OFDM,Channelestimation. 1Introduction Theexplosivegrowthofwirelesscommunicationsiscreatingthedemandforhigh-speed,reliable,and spectrallyefficientcommunicationoverwirelessmedium.Multicarriersystemsandespecially orthogonalfrequencydivisionmultiplexing(OFDM)areconsideredtodaytobeareliablechoicefor highratetransmissionsandarenowwidelyadoptedandtestedinmanycommunicationssystems. IEEE802.11,IEEE802.16,DVB-T,andDABareexamplesoftherecentstandardsemployingaformof OFDMtotransmitathighdataratesforwirelessLANSortobroadcastvideooraudio.Fre