認(rèn)知無線網(wǎng)絡(luò)中頻譜容量與頻譜業(yè)務(wù)建模關(guān)鍵技術(shù)研究的中期報告

認(rèn)知無線網(wǎng)絡(luò)中頻譜容量與頻譜業(yè)務(wù)建模關(guān)鍵技術(shù)研究的中期報告Abstract:Cognitiveradio(CR)allowsunlicenseduserstoaccessunderutilizedlicensedspectrumbydynamicallymodifyingtransmissionparametersandadaptingtochangingenvironment.Inordertomaximizetheutilizationofspectrumresources,itisnecessarytostudythecapacityandmodelingofspectrumaccess.Thispaperpresentsamid-termreportonthekeytechnologiesforstudyingthespectrumcapacityandmodelingofspectrumaccessincognitivewirelessnetworks.Thepaperfirstintroducestheresearchbackgroundofcognitivewirelessnetworks,anddiscussestheresearchstatusandchallengesofspectrumcapacityandmodeling.Then,thepaperpresentsthecurrentresearchmethodsandtechnicalroutes,includingmachinelearning,gametheoryandmathematicalmodeling.Finally,thepaperproposesthefutureresearchdirectionsandthetechnicalchallengesinthefieldofcognitivewirelessnetworks.Keywords:cognitiveradio,spectrumcapacity,spectrummodeling,machinelearning,gametheory,mathematicalmodelingIntroduction:Withtherapiddevelopmentofwirelesscommunicationtechnologyandtheexplosivegrowthofwirelesscommunicationservices,thedemandforwirelessspectrumresourceshasbecomeincreasinglyurgent.However,thefrequencyspectrumisalimitedresourceandhasbeenfullyorheavilyutilizedinmanyregionsandservices.Cognitiveradiotechnologyhasemergedasapromisingsolutiontothespectrumscarcityproblem.Cognitiveradioreferstothewirelesscommunicationtechnologythatallowsunlicenseduserstoaccessunderutilizedlicensedspectrumbydynamicallymodifyingtransmissionparametersandadaptingtochangingenvironment.Cognitivewirelessnetworkisanintelligentwirelessnetworkthatsupportscognitiveradiotechnology,andcaneffectivelyusespectrumresourcesandimprovetheoverallperformanceofwirelesscommunication.However,thekeytothesuccessofcognitivewirelessnetworksliesinthespectrumcapacityandmodelingofspectrumaccess.ResearchStatusandChallenges:Theresearchonspectrumcapacityandmodelingincognitivewirelessnetworkshasbeenahottopicinrecentyears.Variousresearchmethodsandtechnicalrouteshavebeenproposed.Machinelearningisapopularapproachforspectrummodelingincognitivewirelessnetworks.Machinelearningalgorithmscanlearnthepatternsandrulesofspectrumusagefromhistoricaldataandadapttodynamicandcomplexspectrumenvironment.Gametheoryisanotherwidelyusedmethodforstudyingthespectrumaccessbehaviorofcognitiveradiousers.Gametheorycanmodeltheinteractionandcompetitionbetweendifferentcognitiveradiousers,andanalyzetheequilibriumstrategyandperformanceofthesystem.Mathematicalmodelingisatraditionalandeffectiveapproachforanalyzingspectrumcapacityandmodelingincognitivewirelessnetworks.Mathematicalmodelscanaccuratelyandquantitativelydescribethespectrumaccessbehaviorandperformanceofcognitiveradiosystems.However,therearestillmanychallengesintheresearchofspectrumcapacityandmodelingincognitivewirelessnetworks.First,thespectrumenvironmentisdynamicandcomplex,anditisdifficulttoaccuratelymodelandpredictthespectrumusage.Second,thespectrumaccessbehaviorofcognitiveradiousersisinfluencedbymanyfactors,suchastheperformanceofprimaryusers,theinterferencefromothercognitiveradiousers,andthenetworktopology.Itisnecessarytoconsiderthesefactorsandconstructacomprehensiveandrealisticspectrummodelingframework.Third,thedesignofefficientandaccuratespectrumsensingandspectrumsharingalgorithmsiscrucialfortheperformanceofcognitiveradiosystems.ResearchMethodsandTechnicalRoutes:Thecurrentresearchmethodsandtechnicalroutesforspectrumcapacityandmodelingincognitivewirelessnetworksmainlyincludemachinelearning,gametheoryandmathematicalmodeling.Machinelearningisapopularapproachformodelingandpredictingspectrumusageincognitivewirelessnetworks.Machinelearningalgorithms,suchasartificialneuralnetworks,decisiontreesandsupportvectormachines,canlearnthepatternsandrulesofspectrumusagefromhistoricaldataandadapttochangingspectrumenvironment.Thekeychallengeofmachinelearning-basedspectrummodelingistodesignefficientandaccuratefeatureextractionandselectionmethods.Gametheoryisanotherwidelyusedmethodforstudyingthespectrumaccessbehaviorofcognitiveradiousers.Gametheorycanmodeltheinteractionandcompetitionbetweendifferentcognitiveradiousers,andanalyzetheequilibriumstrategyandperformanceofthesystem.Thekeychallengeofgametheory-basedspectrummodelingistodesignappropriategamemodelsthatcanaccuratelyreflectthespectrumaccessbehaviorofcognitiveradiousers.Mathematicalmodelingisatraditionalandeffectiveapproachforanalyzingspectrumcapacityandmodelingincognitivewirelessnetworks.Mathematicalmodelscanaccuratelyandquantitativelydescribethespectrumaccessbehaviorandperformanceofcognitiveradiosystems.Thekeychallengeofmathematicalmodeling-basedspectrummodelingistodesignappropriateanalyticalmodelsthatcanaccuratelycapturethecomplexanddynamicspectrumenvironment.FutureResearchDirectionsandTechnicalChallenges:Theresearchonspectrumcapacityandmodelingincognitivewirelessnetworksisstillinitsearlystage,andtherearemanychallengesandopportunitiesinthisfield.Futureresearchdirectionsandtechnicalchallengesinclude:1.Developmentofnewalgorithmsandtechniquesforspectrumsensingandspectrumsharingincognitiveradiosystems.2.Designofefficientandaccuratespectrummodelingandpredictionmethodsbasedonmachinelearning,gametheoryandmathematicalmodeling.3.Studyoftheimpactofnetworktopology,primaryuserbehaviorandinterferenceonthespectrumaccessbehaviorofcognitiveradiousers.4.Investigationofthesecurityandprivacyissuesincognitiveradiosystems,anddevelopmentofsecureandreliablespectrumaccessmechanisms.5.Developmentofcognitiveradio-basedapplicationsandservices,suchassmartgrid,intelligenttransportationsystems,andwirelessbroadbandaccess.Conclusion:Thispaperpresentsamid-termrepo