Desempenho de sistemas com codificação wavelet e diversidade espácio-temporal em canais sujeitos ao desvanecimento rayleigh plano.

Abstract

In mobile communications channels, the multipath environment can strongly degrade the quality of signals at the receiver. This phenomenon changes the received signal strength and it is usually called fading. Channel coding techniques together with diversity transmitting schemes are used to protect the transmitted information in order to minimizing the destructive effects of the multipath propagation. In this work, the performance of some systems that use wavelet channel coding is studied. The performance of such systems are obtained over additive white Gaussian noise (AWGN) channels or fiat fading channels. Additionally, the impact of the Doppler effect on the system performance is evaluated. Simulation results show that this novel technique should be suitable for combating the effects of fading in mobile communications channels. vi