Codificação de canal usando wavelets em sistemas de comunicação com diversidade sujeitos ao desvanecimento rayleigh.

Abstract

The wavelet theory has been studied for many processing and coding applications of signals transmitted through mobile channels. Bit-by-bit channel coding using wavelet coefficients matrices is a technique based on the ortogonality properties between the lines of such matrices. The principal benefits of this technique are the simplicity of the coding and decoding process and the good performance in fading channels. In wireless communication, multipath signal propagation strongly degrades the quality of transmitted signals. Coding schemes combined with diversity are used to minimize fading effects. In this work i t is presented a technique that integrates the potentiality of the bit-by-bit coding channel using wavelet coefficients matrices with space diversity schemes, through the use of multiple transmitting antennas. The performance of the technique is evaluated through simulations and comparisons with other transmission schemes.