ABSTRACT Title of dissertation ENABLING DYNAMIC SPECTRUM ALLOCATION-豆柴文库

ABSTRACT Title of dissertation ENABLING DYNAMIC SPECTRUM ALLOCATION.pdf

2024-10-23

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ABSTRACT Titleofdissertation:ENABLINGDYNAMICSPECTRUM ALLOCATIONINCOGNITIVERADIO NETWORKS YuanYuan,DoctorofPhilosophy,2007 Dissertationdirectedby:AssociateProfessorWilliamA.Arbaugh, DepartmentofComputerScience ProfessorAgrawalaAshok, DepartmentofComputerScience Thelastdecadehaswitnessedtheproliferationofinnovativewirelesstechnologies, suchasWi-Fi,wirelessmeshnetworks,operatinginunlicensedbands.Duetotheincreas- ingpopularityandthewidedeploymentsofthesetechnologies,theunlicensedbands becomeovercrowded.Thewirelessdevicesoperatinginthesebandsinterferewitheach otherandhurttheoverallperformance.Tosupportfastgrowthsofwirelesstechnologies, morespectrumsarerequired.However,asmost“prime”spectrumhasbeenallocated, thereisnospectrumavailabletoexpandtheseinnovativewirelessservices.Despitethe generalperceptionthatthereisanactualspectralshortage,therecentmeasurementre- sultsreleasedbytheFCC(FederalCommunicationsCommission)showthatonaverage only5%ofthespectrumfrom30MHzto30GHzisusedintheUS.Thisindicatesthatthe inefﬁcientspectrumusageistherootcauseofthespectralshortageproblem.Therefore, thisdissertationisfocusedonimprovingspectrumutilizationandefﬁciencyintackling thespectralshortageproblemtosupportever-growinguserdemandsforwirelessappli- cations. Thisdissertationproposesanovelconceptofdynamicspectrumallocation,which adaptivelydividesavailablespectrumintonon-overlappingfrequencysegmentsofdif- ferentbandwidthconsideringthenumberofpotentiallyinterferingtransmissionsandthe distributionoftrafﬁcloadinalocalenvironment.Thegoalsare(1)tomaximizespectrum efﬁciencybyincreasingparalleltransmissionsandreducingco-channelinterferences,and (2)toimprovefairnessacrossanetworkbybalancingspectrumassignments.Sinceex- istingradiosystemsofferverylimitedﬂexibility,cognitiveradios,whichcansenseand adapttoradioenvironments,areexploitedtosupportsuchadynamicconcept. Weexploretwodirectionstoimprovespectrumefﬁciencybyadoptingtheproposed dynamicallocationconcept.First,webuildacognitivewirelesssystemcalle

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