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Redução do rácio entre a potência de pico e a potência média para a modulação de pacotes Wavelet
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ISBN10: 6208304938
ISBN13: 9786208304935
Publisher: Edicoes Nosso Conhecimento
Published: Nov 18 2024
Pages: 64
Weight: 0.23
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786208304935
Publisher: Edicoes Nosso Conhecimento
Published: Nov 18 2024
Pages: 64
Weight: 0.23
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Portuguese
A redução da relação entre o pico e a potência média (PAPR) é um tópico crÃtico em sistemas de comunicação, especialmente para aqueles que utilizam esquemas de modulação multi-portadora, como a modulação de pacotes Wavelet (WPM). A alta PAPR em tais sistemas pode levar a ineficiências nos amplificadores de potência, uma vez que os amplificadores precisam acomodar os picos, o que desperdiça energia e degrada o desempenho devido a não-linearidades.Nesta pesquisa nós investigamos duas técnicas de redução de PAPR, a saber, Mapeamento Seletivo (SLM) e Sequências Parciais de Transmissão (PTS). A técnica de Mapeamento Seletivo (SLM) gera múltiplos sinais candidatos aplicando diferentes sequências de fase ao sinal original. O sinal com a PAPR mais baixa é selecionado para transmissão. Embora eficaz, requer uma sobrecarga de sinalização adicional para transmitir a sequência de fase selecionada. As sequências de transmissão parciais (PTS) dividem o sinal de entrada em sub-blocos disjuntos e as fases de cada sub-bloco são optimizadas para reduzir a PAPR. Embora a PTS seja mais intensiva em termos computacionais, ela pode reduzir significativamente a PAPR sem distorcer o sinal.
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