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Home > Science, Technology & Agriculture > Electronics and communications engineering > Electronics engineering > Codes de blocs spatio-temporels pour les applications sans fil
Codes de blocs spatio-temporels pour les applications sans fil

Codes de blocs spatio-temporels pour les applications sans fil


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About the Book

L'évanouissement peut être à l'origine de mauvaises performances dans un système de communication car il peut entraîner une perte de puissance du signal sans réduire la puissance du bruit. Cette perte de signal peut concerner une partie ou la totalité de la largeur de bande du signal. Les systèmes de communication sont souvent conçus pour s'adapter à ces dégradations, mais l'évanouissement peut changer plus rapidement que les adaptations ne peuvent être effectuées. Dans ce cas, la probabilité de subir un évanouissement (et les erreurs binaires associées lorsque le rapport signal/bruit diminue) sur le canal devient le facteur limitant de la performance de la liaison.Les effets de l'évanouissement peuvent être combattus en utilisant la diversité pour transmettre le signal sur plusieurs canaux qui subissent des évanouissements indépendants et en les combinant de manière cohérente au niveau du récepteur.Bien que plusieurs techniques de diversité aient été mises au point pour éliminer l'effet de l'évanouissement par trajets multiples dans les communications sans fil, elles posent certains problèmes. Tout d'abord, dans toutes les techniques de diversité de réception, l'amélioration des performances par l'augmentation de la complexité de l'équipement au niveau du récepteur devient plus problématique, car les unités distantes sont censées être des communicateurs de poche légers et de petite taille. Cette complexité est abordée dans le présent document.


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Product Details
  • ISBN-13: 9786208508517
  • Publisher: Editions Notre Savoir
  • Publisher Imprint: Editions Notre Savoir
  • Height: 229 mm
  • No of Pages: 76
  • Returnable: N
  • Weight: 177 gr
  • ISBN-10: 6208508517
  • Publisher Date: 28 Dec 2024
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Spine Width: 5 mm
  • Width: 152 mm


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