SILVEIRA JÚNIOR, S. J.; http://lattes.cnpq.br/5714183212530259; SILVEIRA JÚNIOR, Luiz Gonzaga de Queiroz.
Résumé:
Inthis thesis, new applications ofwavelet codingtechnique inwireless communications systems are proposed and discussed. Important contributions are obtained, such as the conception of iterative decoding scheme for serial concatenations with wavelet coding. Besides, some investigations are performed in order to realize a soft-input soft-output wavelet decoder. The major part of this work is devoted to formulate a strategy to exchange soft information iteratively, which consider a novel soft demapping approach. Several performance evaluations were carried out, where a concatenation with a convolutional encoder over a flat fading channel is investigated. The numerical results so obtained indicate that the proposed method is an effective tool for performance improvement of wavelet-coded systems. Therefore, this new approach for
iterative decoding may lead to new alternatives for exploiting the potential of wavelet coding for digital communications over wireless channels.