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ID:21036821
大小:8.16 MB
页数:219页
时间:2018-10-19
《mimo系统关键技术研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、spacedegreesoffreedom,andthisthreeaspectscanbetakenintoaccounttooptimizeanddesignthecommunicationsystems.Basedonpreviousresearch,thisdissertationfirstdefinestheconceptionofthree-dimensionaljointresourcesandgivesthesystemmodelwithagroupofsymbolsasastudyingunit.Thenthecorrespondingcon
2、straintsareestablished,andtheobjectivefunctionoftheoptimalcapacityisderived.Finally,theupperboundofthesystemcapacityunderthethree-dimensionalchannelpartitionisobtained.3)Ageneralizedspatialmodulationisputforward.IntraditionalMIMOsystems, theantennasareemployedtoformphysicallinksfori
3、nformationtransmission.In generalizedspatialmodulationsystems,thecombinationsoftransmitantennasare usedtoconveyinformationbitsinadditiontoformingphysicallinks.Theselected transmitantennasareconsideredasvirtualspatialconstellationwhichisadoptedto modulateinformationbits.ComparedtoSIS
4、Osystems,thegeneralizedspatial modulationsystemsimprovethesystemspectralefficiency.Inaddition,sinceallthe selectedtransmitantennastransmitthesamedigitalmodulationsymbols,thechannel interferencecanbeavoidedwhilediversitygaincanbeobtained.Therefore,the robustnessofthecommunicationsyst
5、emsisenhanced.Inthisdissertation,the proposedalgorithmisanalyzedintheoryandverifiedbythesimulations.4)ThecodewordsofSSKmodulationareoptimized.Forthepropertyof reconfigurableantenna,itcanbeadoptedtooptimizetheSSKcodewords. TheoreticalanalysisshowsthatthesignaldetectionaccuracyofSSKmo
6、dulation systemswithsuchcodewordsisimproved.Thebiterrorratesimulationvalidatesthe resultsoftheoreticalanalysis.5)Themethodsthatemployingspaceredundancytocorrectthesignalerroris studied.Intraditionalcommunicationsystems,timeredundancyisadoptedtodo signalerrordetectionanderrorcorrecti
7、on.MIMOtechnology,whichmakesthespace canbedivided,increasesthedegreeoffreedomofthecommunicationssystem.Two methodstoimplementchannelcodinginspacedomainarestudiedinthisdissertation. Thesystemblockdiagramsarepresentedandtheprinciplesareanalyzed.The simulationsaredonetoillustratethesys
8、temperformance.6)Th
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