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1、CognitiveRadioMobileAdHocNetworksF.RichardYuEditorCognitiveRadioMobileAdHocNetworks123EditorF.RichardYuSchoolofInformationTechnologyDepartmentofSystemsandComputerEngineeringCarletonUniversityOttawa,K1S5B6ON,Canadarichard_yu@carleton.caISBN978-1-4419-6171-6e-ISBN978-1-4
2、419-6172-3DOI10.1007/978-1-4419-6172-3SpringerNewYorkDordrechtHeidelbergLondonLibraryofCongressControlNumber:2011933806cSpringerScience+BusinessMedia,LLC2011Allrightsreserved.Thisworkmaynotbetranslatedorcopiedinwholeorinpartwithoutthewrittenpermissionofthepublisher(Sp
3、ringerScience+BusinessMedia,LLC,233SpringStreet,NewYork,NY10013,USA),exceptforbriefexcerptsinconnectionwithreviewsorscholarlyanalysis.Useinconnectionwithanyformofinformationstorageandretrieval,electronicadaptation,computersoftware,orbysimilarordissimilarmethodologynowk
4、nownorhereafterdevelopedisforbidden.Theuseinthispublicationoftradenames,trademarks,servicemarks,andsimilarterms,eveniftheyarenotidentiÞedassuch,isnottobetakenasanexpressionofopinionastowhetherornottheyaresubjecttoproprietaryrights.Printedonacid-freepaperSpringerisparto
5、fSpringerScience+BusinessMedia(www.springer.com)TomyparentsandmyfamilyPreface1IntroductionCognitiveradio(CR)isanenablingtechnologytoallowunlicensed(secondary)userstoexploitthespectrumallocatedtolicensed(primary)usersinanopportunis-ticmanner.CRiswidelyconsideredasapromi
6、singtechnologytodealwiththespec-trumshortageproblemcausedbythecurrentinßexiblespectrumallocationpolicy.Itiscapableofsensingitsradioenvironment,andadaptivelychoosingtransmissionparametersaccordingtosensingoutcomes,whichimprovescognitiveradiosystemperformanceandavoidsint
7、erferingwithprimaryusers.CRhasbeenconsideredinmobileadhocnetworks(MANETs),whichenablewirelessdevicestodynamicallyestablishnetworkswithoutnecessarilyusingaÞxedinfrastructure.CRtechnologywillhavesigniÞcantimpactsontheperformanceinwirelessnetworks,especiallyinMANETs.Certa
8、inly,issuesinnon-cognitiveMANETsingeneralarestillofinterestintheCRparadigm.However,somedistinctcharacteristicsofCRsin
