Deteção de Sinais TCM em Canais com Intercalação e Desvanecimento Não-Seletivo em Freqüência<br />DOI: 10.14209/jcis.1997.10

Abstract

We look into a new strategy for detecting signals with trellis coded modulation transmitted over a frequencynonselective fading channel. For both, interleaved and noninterleaved systems, the Viterbi algorithm is used to choose the coded sequence which minimizes an additive metric incorporating estimates of the fading samples in each symbol interval. Kalman estimators are used to recursively update these estimates on a per survivor basis whereupon, at a given instant, a distinct estimate is associated to each trellis node. Bit error rate curves evaluated by computer simulations are compared to curves obtained with ideal fading knowledge and to curves pertaining to other methods in the literature.