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1、ThisfulltextpaperwaspeerreviewedatthedirectionofIEEECommunicationsSocietysubjectmatterexpertsforpublicationintheIEEEICC2009proceedingsBlindSpectrumSensingforCognitiveRadioBasedonSignalSpaceDimensionEstimationBassemZayen∗,AawatifHayar∗andKimmoKansanen†∗MobileCommun
2、icationsGroup,EurecomInstitute,2229RoutedesCretes,B.P.193,06904SophiaAntipolis,France,Email:{zayen,hayar}@eurecom.fr†Dept.ofElectronicsandTelecom.NorwegianUniv.ofScienceandTechnology,7491Trondheim,Norway,Email:kimmo.kansanen@iet.ntnu.noAbstractBasedoninformationth
3、eoretictools,anewspec-Matchedfilteringisanoptimalwayforsignaldetectionintrumsensingmethodisproposedinthispapertodetectvacantcommunicationsystems.However,itrequirespriorknowledge1sub-bandsintheradiospectrum.Specifically,basedontheonthelicensedusersignalwhichmaynotbea
4、vailable.Energysubspaceanalysisofthereceivedsignal,wepresentanewmethoddetectionisoftenusedtodeterminethepresenceofsignalstodetectthesignalpresenceinablindway.Wehaveshownthattheanalysisofsignaldimensioncanassistblindspectrumwithoutpriorknowledge.However,inthemostge
5、neralcasesensingprocedure.Indeed,wehaveshownthattheslopechange,nopriorinformationisavailablesothatenergydetectionfrompositivetonegativetrend,ofthesignalspacedimensionistheonlypossibilityleft.Energydetectioncomparesthecurveisrepresentativeofthetransitionfromavacant
6、bandreceivedenergyinacertainfrequencybandtoausuallytoanoccupiedband(andviceversa).Infact,thenumberofpredefinedthreshold.However,therearelimitationsforthesignificanteigenvaluesisdeterminedbythevaluethatminimizestheAkaikesInformationCriterion(AIC)andisdirectlyrelatede
7、nergydetection:First,thedecisionthresholdissubjecttotothepresence/absanceofdatainthesignal.Thevalidationchangingsignaltonoiseratios.Second,itcannotdistinguishofthisnewmethodisbasedonexperimentalmeasurementsinterferencefromausersignalanditisnoteffectiveforcapturedb
8、yEurecomRFAgilePlatformoperatingfrom200´signalswhosesignalpowerhasbeenspreadoverwideband.MHzto7.5GHz.SimulationsshowgoodresultsintermsofTherefore,thepow
