OFDM系统中峰均比问题的研究

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1、北京交通大学硕士学位论文OFDM系统中峰均比问题的研究姓名：姚道仓申请学位级别：硕士专业：通信与信息系统指导教师：李旭20080601ABSTRACTABSTRACT：OrthogonalFrequencyDivisionMultiplexing(OFDM)isoneofthekeytechnologiesfornextgenerationmobilecommunication，asitsadvantagessuchashighfrequencyusage,antifrequencyselectiv

2、efadingetc．ButitsinherentweaknessashighPeak．．to--AveragePowerRatio(PAPR)makeshighrequestforthelinearityofpoweramplifierintransmitterandreceiver,andincreasesthecomplexityofA／DandD／Aconverter．HighPAPRatthetransmitterleadstothehighpoweramplifier(HPA)togoi

3、ntonon—linearregionsandcausenonlineartransform，anddegradetheperformanceofOFDMsystemseriously-HighPAPRisoneofmainbottlenecksofOFDMtechnologyforpracticalimplementation．ThusitissignificanttoreducePAPRinOFDMsystem．ThisthesismainlystudiesthePAPRprobleminOFD

4、Msystem．BasedonintroducingthebasicOFDMprinciple，weanalyzethereasonofhighPAPRanditsinfluencesforthesystem，giveoutmathematicaldefinitionofPAPRanddepictregularitiesofdistributionforstatisticcharacteristics．UsuallyweusetheCCDFcurvetodescriptthePAPRcapabili

5、ty．ThetechnologythatreducingPAPRathomeandabroadCanbedividedintothreecategories：signalpre—-distortiontechnology,signalnon··distortiontechnologyandcodingtechnology．Thisthesissimplyintroducessignalpre—distortiontechnology(thedirectclippingarithmeticandcom

6、press—expandarithmetic)andcodingtechnology．Herewemainlystudythesignalnon—distortiontechnology,includingthetypicalarithmeticslikeselectivemapping(SLM)，partialtransmitsequence(PTS)，andcomparethemintheaspectsofreducingPAPRcapability,sideinformationandsyst

7、emcomplexity．Duetothedisadvantageofhighcomplexityandneedtosendsideinformationintraditionalmethods，thisthesisproposestwokindsofarithmetic：improvediterativePTSarithmeticandlowercomplexitytonereservationarithmetic，bothofwhichhavetheadvantageoflowercomplex

8、ityandnoneedtosendsideinformationadditionally,thusdecreasethecomplexityinreceiver．Accordingtothesimulation，thetwokindsofproposedarithmeticareprovedtoreachthePAPRcapabilityasthetraditionalonesbutwithmuchlowercomplexity．AndwestudytheDFT-S