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Sociedade Brasileira de Telecomunicações

Modelamento Markoviano para Transmissão de Símbolos Não Binários Usando Sistemas OFDM em Canais Seletivos em Frequência


This paper evaluates the relevance of using a fi- nite state Markov channel, more specifically the Gilbert-El liot channel (GEC) in order to reproduce the behavior of a discret e communications system, based on the IEEE 802.11 standard, with OFDM modulation and frequency-selective fading. Symb ol errors generated by the transmission of codewords produced by a Reed-Solomon encoder, outer concatenated to the discrete s ystem, are modeled. The accuracy of the GEC, whose parameters are estimated using the Baum-Welch algorithm, is evaluated by comparing some statistics generated by the communicatio n system and by the GEC.

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