MIMO-OFDM系統(tǒng)中的鏈路自適應(yīng)研究.pdf

1、代號(hào)l嬰蜘一分類黽j嬰繁點(diǎn)學(xué)號(hào)輿!墅艘避；窶豫叁翌兩簧絮手瓣款文譽(yù)碩士學(xué)位論文題(中、莓文)翌MIMo。oFDM系綾中的鏈路囪適應(yīng)研究“n螽Ad矗ptiveInMIM@oFDMSvs繾msⅢ一一_一●●一●一一一★一一一一一●一一★一一一一^m～●●一一^mH儺卷姓名賈嬡指導(dǎo)教師爛名、職務(wù)李建東教授學(xué)科門(mén)類工學(xué)學(xué)戮、專業(yè)通信與信怠系統(tǒng)提交論文鰻期ooo六年一月Abstrac【AbstractHi曲一speedWirelessdataⅡa

2、nsmissionrequiresrobustandspectrallye幣cientcommunicationtechniquesWhenthechannelcanbeestimateda11dthisestimateissembacktothetransmitteLthe咖smissionschemecanbeadaptedrelativelytomechannelcharacteristicsMostmodmationandcod

3、ingtechniquesdonotadapttofadingconditionsThesenon—adaptiVeⅡ1ethodsrequireafixedliilkmargintomaintainacceptableperf0塒舊ncewhentllechaIlnelqualityispooLThus，thesesystemsareemctiVelydesignedfortheworstch咖elconditiolls，result

4、ingininsu茁cientutilizationofthewholechaIlnelc印acityAdaptingtothesignalfadingallows吐lechanIldtobeusedmoreemcientlysincepowerandratecanbeallocatcdtotakeadvantageoffavorablechannelconditionsInthispaper，avariable—rateandvari

5、ablepowerMQAMandMPSKmodulationschemebased0npemctcsIforbj曲speeddatatransmjssjoDjnMIMO—OFDMsystemsoVerfkquencyselectivefadingchannelswasproposedTheauthorfirstreViewedresuhsforme“water_filling”powera110cationschemeofMIMOsys

6、tems、vj恤channel8ideinformation，wherethemaximumc印acityisachievedusingadaptivetransrIlissiontechniquesTheoFDMtechniquecanchangethefrequencyselectivefadingchanneltomenatf甜ingchannelAccordingtotI】at，thepaperthenderivedmeperf

7、bnllallceresunsofthesystemusingthenewad印tivealgorithInineachsub—channeltoachieve山emaximumsub—channelcapac“yin矗equencyselectivefadingchannelThisresultsfhnhe咖oreVeri丘est11atthenewalgoritIuncanimprovethefrequencyemciencyofM

8、IMO—OFDMsystemsThent11eaumorcomparedthenewalgorimm、vimthcunifb咖a110catingalgoritllIIla11dthechaIlllelreverSillgalgoritllIn，analyzedtheiradvaIltagesanddisadvantagesBycomparingthethreealgorithmsinconditi吼sofdi臟remnumberofs

9、ub—carriers(N=40，80，200，400)anddi彘remttargetBER(10，10一，lO。，lO～，10，102)re唧)ectively’吐1eauthorobtainedthatthenewalgoritlll[nhadmuchbenerperfb螄ancetllalltheothernⅣ0BecauseofthedelayofthefeedbackchaIlnel鋤d吐Iclimitationofch秈e