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Riduzione del rapporto potenza media/picco per la modulazione Wavelet a pacchetti
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ISBN10: 620830492X
ISBN13: 9786208304928
Publisher: Edizioni Sapienza
Published: Nov 18 2024
Pages: 60
Weight: 0.22
Height: 0.14 Width: 6.00 Depth: 9.00
Language: Italian
ISBN13: 9786208304928
Publisher: Edizioni Sapienza
Published: Nov 18 2024
Pages: 60
Weight: 0.22
Height: 0.14 Width: 6.00 Depth: 9.00
Language: Italian
La riduzione del rapporto tra picco e potenza media (PAPR) è un argomento critico nei sistemi di comunicazione, soprattutto per quelli che utilizzano schemi di modulazione a più portanti come la modulazione Wavelet a pacchetti (WPM). L'elevato PAPR in questi sistemi può portare a inefficienze negli amplificatori di potenza, in quanto gli amplificatori devono adattarsi ai picchi, con conseguente spreco di energia e degrado delle prestazioni a causa delle non linearità . In questa ricerca abbiamo studiato due tecniche di riduzione del PAPR: la mappatura selettiva (SLM) e le sequenze di trasmissione parziali (PTS). La tecnica di mappatura selettiva (SLM) genera più segnali candidati applicando diverse sequenze di fase al segnale originale. Il segnale con il PAPR più basso viene selezionato per la trasmissione. Sebbene sia efficace, richiede un sovraccarico di segnalazione per trasmettere la sequenza di fase selezionata. Le sequenze di trasmissione parziale (PTS) dividono il segnale di ingresso in sottoblocchi separati e le fasi di ciascun sottoblocco vengono ottimizzate per ridurre il PAPR. Pur essendo più impegnativo dal punto di vista computazionale, il PTS può ridurre significativamente il PAPR senza distorcere il segnale.
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