基于OFDM的分組傳輸系統(tǒng)的性能分析與比較.pdf

1、Y1411523南京郵電大學(xué)碩士學(xué)位論文摘要學(xué)科、專業(yè)：工學(xué)通信與信息系統(tǒng)研究方向：無線數(shù)據(jù)與移動計算網(wǎng)絡(luò)作者：二塑墮級研究生邵偉指導(dǎo)教師苤苤友題目：基于OFDM的分組傳輸系統(tǒng)的性能分析與比較英文題目：PerformanceAnalysisandComparisonofOFDMBasedPacketTransmissionSystem主題詞：正交頻分復(fù)用正交調(diào)幅時頻定位碼分多址誤符號率誤包率頻譜效率Keywords：Orthogonal

2、FrequencyDivisionMultiplexing(OFDM)QuadratureAmplitudeModuhtion(QAM)TimeFrequencyLocalizedCDMA(TFLCDMA)SymboleErrorRate(SER)PacketErrorRate(PER)SpectralEfficiency南京郵電大學(xué)碩十研究生學(xué)位論文AbstractAbstractNowdays，mobileradiocommunic

3、ationsystemsaremainlyaffectedbyfrequencyandtimeselectiveradiochannelduetomultipathpropagationandDopplershiftsForcombatingthesetwoeffectsofradiochannels，allOFDMbasedsystemthatiswithfixedandadaptiveorderQAMschemesandTFL—CD

4、MAtechniquewillbedescribedandstudiedinthisthesisOFDMtechniquecanremovetheintersymbolinterferencethatcomesfromdelaydifferenceofmultipathchannelsbyinsertingaguardintervalintoeachOFDMsymb01TFLCDMA，namedTime—FrequencyLocaliz

5、edCDMA，callovercomethemultipatheffectduetodiversityanduserseparationfromtheplacingcodewordchipsinarectangularblockoveratime—frequencybinQAMschemecarleffectivelyimprovetheperformancewhentransmissionoveraflatfadingchannel，

6、especiallyanadaptiveQAMschemecailgainthebestorthogonaltime—frequencyresourceutilizationbyusingchannelpredictionandfeedbackofthisinformationtOtheschedulerTherefore，anOFDMbasedsystemcombinedwiththefixedoradaptiveQAMschemea

7、ndTFLCDMAtechniqueisproposedFromsimulationresults，itisfoundthattheproposedOFDMbasedadaptiveQAMsystemoutperformsothercompetingsystemonspectralefficiency，suchasOFDMbasedfixedQAMsystemwithoutorwithTFLCDMAchipmappingtechniqu