OFDM系統(tǒng)中抑制相位噪聲算法的研究.pdf

1、武漢理工大學(xué)碩士學(xué)位論文OFDM系統(tǒng)中抑制相位噪聲算法的研究姓名：吳悠申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：黃秋元20080401武漢理J二人學(xué)碩十學(xué)位論文AbstractAsahi曲lyefficientmodulationtechnique，OFDMcaneffectivelydealwiththeISIintroductedbythemulti—pathfadingchannelAtthesametime，OFDMsys

2、temhavingefficientspectrum，CanprovideahighertransferrateTherefore，OFDMtechnologyisapplicabletofuturehighspeedwirelessmultimediacommunicationssystemsOFDMsystemrequiresforintercarrierwithstrictorthogonal，anditssymbolcyclei

3、slong，50it’SverysensitiveofthephasenoiseinlocaloscillatorPhasenoiseisarandomphaseinterfererintroductedbythenonidealfactorsoffrequencysourceItCanintroducetwoeffectsoftheOFDMsignaldemodulator：thepublicphaseerror(CPE)andthe

4、intercarrierinterference(ICI)ThetraditionalmethodofthecompensationistocorrecttheCPE，whileconsideringICIasakinsmanshipGaussiannoiseThisapproachdoesnotalwaysmeetthesystemrequirements，especiallyinthehighspeedcommunicationss

5、ystemsThroughanalysisofthetheoriesandthekeyfeaturesofOFDMtechnologythispapersresearchsthetrackingandsuppressionalgorithmofthephasenoise，andproposesimprovementmeasures，specificdesignandimplementation，basedontheDVB—Tsystem

6、Themainresearchworksareasfollows：(1)DetaillyanalysesthemodelingprocessofphasenoisemodelwhichapplicabletotheDVBTsystemTheMainideaistocombinethefilterphasenoisemodelandMATLABphasenoisemodeltosimulatethephasenoiseThenitisac

7、cesedtothephaseofthesignalafterthesamplingandthephaserotation(2)ProposesacorrectionsystemofphasenoisetoeliminatetheCPEandICIinterferencesofthesystem，simulatingandachievingThesystemneedsthehelpofthepilotinformationandchan

8、nelestimationinformationofOFDMsystemTherearethreekeymodules：CHEmodule，CPEeliminationmodule，ICIsuppressionmoduleThealgorithmsofthethreemodulesareallcompletedinthefrequencydomain，andafterthecompletionofchannelestimationand