MIMO-OFDM系統(tǒng)中信道盲估計方法的研究.pdf

1、學科門婁—墨——!L分監(jiān)o—衛(wèi)蝗!L單位代日—』蝗!!一密緞：——孫杰瓴嘎蕓讒碩士學位論文論文題目：坐!堅Q二Q業(yè)堅墨笙主堡望盲估計方法的研究學生姓名學號指導教師學科專業(yè)研究方向論文提交日期郭士偉碩050719曹雪虹教授墮蘭!墮星些壟現代通信中的信號與信息處理技術oo八年四月南京郵電大學碩上研究生學位論文摘要AbstractChannelestimationisveryessentialintheMIMO—OFDMdetectorfor

2、coherentdemodulationandspace—timecode(STC)decodingChannelCanoftenbeestimatedbytrainingsequencesoraidofpilots，buttheywastebandwidthandreducetheefficiencyofsystemsThedemandforhighdataratetransmissionthusmakesblindchanneles

3、timationattractiveSowefocusonblindchannelestimationinthispaperInthisthesis，weinvestigateablindchannelestimationmethodanditsimprovedmethoddeeplyTheimprovedmethoddiscardsthedisturbedcyclicprefixdatumincomparisonwiththeexis

4、tedalgorithm。ThesimulationshowsitsbetterperformancethanthesimilaralgorithmAlso，twoblindchannelestimationmethodswhichcombineSTCandlinearprecodingatthetransmitterarestudiedFirstlyablindchannelestimationalgorithmforspace—ti

5、meOFDMwithtwotransmittingantennasandtworeceivingantennasisdiscussedItscomputationalcomplexityisveryhigh，becausethechannelisestimatedbyeigendecomposingtwiceSecondly，ablindchannelestimationbasedonlinearprecodingisstudiedTh

6、eprecodingintroducescorrelationstotheinputsThechannelisestimatedbyeigen—decomposingthestatisticalauto—correlationmatrixofreceivedsignalsonce，butthismethodhaserrorfloorBasedontheresearchofthismethod，weproposeanewimpairedp