基于訓(xùn)練序列與循環(huán)前綴的OFDM系統(tǒng)同步算法研究.pdf

1、太原科技大學(xué)碩士學(xué)位論文基于訓(xùn)練序列與循環(huán)前綴的OFDM系統(tǒng)同步算法研究姓名：司秉楠申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：控制理論與控制工程指導(dǎo)教師：卓東風(fēng)20080701ABSTRACTABSTRACTOFDM(orthogonalfrequencydivisionmultiplexing)isanappealingmodulationtechniqueforhighspeedwirelesscommunicationsystemowingtoit

2、sspectralefficiencyandrobustnessagainstmultipathfadingIntheOFDMsystem，thewholesystembandwidthisdividedintomanysub—channelwithnarrowbandwidthandbandwidthefficiencyisincreasedbyallowingoverlappingofthesub—channelsMoreover，

3、seriousISI(InterSymbolInterference)andICI(InterCarrierInterference)CanbereadilycircumventedbyintroducingCP(CyclicPrefix)However，theseadvantagesoftheOFDMsystemsCanbeonlyguar_anteedwhentheorthogonalitybetweensubcarrierisma

4、intainedIfthisorthogonalityisdestroyed，seriousdeteriorationofsystemperformancemayoccurduetoICIbetweensubcarrierThemostcriticalcausesyieldingtheISIaswellasICIaresymboltimingandcarrierfrequencyoffsetwhichareoccurredintheOF

5、DMreceiverHence，synchronizationhasbeenamajorresearchtopicinOFDMsystemsfortheyaresensitivetosymboltimingerrorandcartierfrequencyoffsetThedissertationanalysesthebasicprinciplesofOFDM，theguardintervalsandthecyclicprefixesof

6、OFDM，aswellastheconceptualarchitectureandkeytechniquesofOFDMmodulatorsanddemodulatorsThedissertationisfocusedonsynchronizationofOFDMsystemsTheinfluencesonOFDMsystem’Sperformance，whicharecausedbythedistortionsofcarrierfre

7、quency，carrierphase，samplesfrequency，samplesphaseandsymboltiming，willbediscussedrespectivelyAvairetyofalgoirthmsforsynchronizationiSdiscussedondetailsaswellVariousexistingsynchronizationalgorithmtoestimatesymboltimingoff

8、setandcarrierfrequencyoffsetcanbeclassifiedintoblindandpilot—aidedmethodsandalgorithmbasedoncyclicprefixThispapermainlystudies，analysisandcomparessomesynchroni—zafionalgorithmsusingthesemethodsAtthesametime，simulationsof