Uma rede de codificação/decodificação para canais não-coerentes

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

Due to the extraordinary results, widely mentioned in the literature, attained with turbo decoding, new research lines have been suggested and followed, trying to apply these contributions in new decoding sceneries. Among the existing applications, the concept of decoding networks, reception systems using what is known as turbo principIe or iterative processing, stands out. This work begins from a decoding network previously proposed to a serial concatenation of a convolutional coding and a differential phase shift keying (DPSK) modulator used in coherent channels. Therefore, the proposal of this thesis was the replacement of the convolutional coding by the turbo coding. This action creates, in this way, another decoding scenery allowing the use and the combination of two different forms of iterations: one due to the iterative process itself, and another inherent in turbo decoding. As the proposed decoding network is used in non-coherent channels, a modification in the detection MAP (maximum a posteriori) algorithm was suggested. In addition, a detailed description of the system in study is also presented. Simulation results indicates that certain combinations of the two iteration forms, of the decoding network, have a better trade off between performance and implementation complexity

ASSUNTO(S)

comunicações digitais codigos de controle de erros (teoria da informação) modulação digital teoria da codificação sistemas de comunicação movel

ACESSO AO ARTIGO

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