Détection cyclostationnaire des bandes de fréquences libres

L’objectif de ce travail est de repondre a la question de detection des bandes de frequences libres. Le cadre d’etude est l’acces opportuniste au spectre radio. Deux methodes de detection sont envisageables. La detection d’energie est une methode simple, de complexite de calcul reduite et n’exigeant aucune information sur le signal a detecter, mais elle necessite une connaissance exacte de la variance du bruit suppose blanc gaussien. La detection cyclostationnaire est plus robuste vis-a-vis des incertitudes d’estimation de la variance du bruit et capable de detecter des signaux a faibles RSB. Nous avons propose deux algorithmes de detection cyclostationnaire. Dans le premier, la frequence cyclique dans le signal est supposee connue, alors que dans le deuxieme la cyclostationarite est detecte de maniere aveugle. Cependant, pour minimiser le temps de detection des bandes libres, nous proposons une architecture hybride de detection combinant les detections d’energie et cyclostationnaire.

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