Détection coopérative du spectre pour la radio cognitive
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Détection coopérative du spectre pour la radio cognitive

Détection coopérative du spectre pour la radio cognitive


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About the Book

La sous-utilisation du spectre, ainsi que le problème croissant de la rareté du spectre, ont encouragé une réévaluation de la façon dont le spectre des fréquences radio est utilisé. La technologie de la radio cognitive est une solution qui améliore l'utilisation du spectre grâce à une utilisation systématique de la ressource rare par un accès opportuniste au spectre. Parmi les nombreux algorithmes de détection du spectre disponibles, le détecteur d'énergie (ED) est préféré car il n'a pas besoin d'informations préalables sur les signaux de l'utilisateur principal et sa complexité de calcul est faible. Cependant, les performances du détecteur d'énergie sont directement proportionnelles au rapport signal/bruit (SNR), ce qui entraîne des performances médiocres en cas de SNR faible. Afin d'atténuer le problème de détection à faible rapport signal/bruit, un débruitage du signal de l'utilisateur primaire basé sur la transformée en ondelettes discrètes (DWT) est appliqué à l'extrémité avant de la DE. L'effet du débruitage avant la DE est analysé en utilisant six différentes ondelettes mères: Haar, Daubechies, BiorSplines, ReverseBior, Coiflets et Fejer-Korovkin. Les résultats de la simulation ont montré que l'approche de l'ondelette mère Reverse Bior améliore toutes les matrices de performance.


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Product Details
  • ISBN-13: 9786205602485
  • Publisher: KS Omniscriptum Publishing
  • Publisher Imprint: Editions Notre Savoir
  • Height: 229 mm
  • No of Pages: 100
  • Spine Width: 6 mm
  • Width: 152 mm
  • ISBN-10: 6205602482
  • Publisher Date: 25 Jan 2023
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Weight: 209 gr


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