mimo系统关键技术研究

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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