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Rilevamento multiutente per CDMA a portanti multiple

Rilevamento multiutente per CDMA a portanti multiple

Anmol Goyal

72,14 €
IVA incluido
Disponible
Editorial:
KS OmniScriptum Publishing
Año de edición:
2026
Materia
Informática: cuestiones generales
ISBN:
9786630248609
72,14 €
IVA incluido
Disponible

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Il rilevamento multiutente (MUD) per l’accesso multiplo a divisione di codice a portanti multiple (MC-CDMA) si è affermato come un’area di ricerca fondamentale nei moderni sistemi di comunicazione wireless a banda larga, affrontando una delle sfide più persistenti nelle tecnologie basate sul CDMA: l’interferenza multiutente (MUI). Man mano che le reti wireless continuano ad espandersi in termini di capacità, copertura e densità degli utenti, la necessità di tecniche avanzate di mitigazione delle interferenze è diventata innegabile. L’MC-CDMA, che combina la diversità di frequenza dell’Orthogonal Frequency Division Multiplexing (OFDM) con i vantaggi dello spettro diffuso del CDMA, si è dimostrato significativamente robusto per applicazioni ad alta velocità di trasmissione dati. Tuttavia, le sue prestazioni rimangono fortemente influenzate dalla presenza di MUI e dalle imperfezioni dei canali wireless. Pertanto, strategie efficaci di mitigazione delle interferenze tra utenti (MUD) diventano fondamentali per ottenere una comunicazione affidabile ed efficiente dal punto di vista spettrale. L’MC-CDMA distribuisce il simbolo di ciascun utente su più sottoportanti ortogonali tramite una sequenza di diffusione. Questo design offre intrinsecamente una forte resilienza contro il fading selettivo in frequenza, poiché anche se alcune sottoportanti subiscono un fading profondo, l’energia del simbolo può comunque essere recuperata da altre.

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