Modulação multiportadora codificada por bloco para radioenlaces digitais em microondas com linha de visada

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

The availability of line-of-sight (LOS) microwave digital systems which work at high transmission rates such as 155 Mb/s, may be strongly limited by frequency-selective fading effects. The main countermeasure techniques against the fading are equalizations, diversity and error control coding. Under adverse geoclimatic conditions, the path length and/or the transmission rate may suffer restrictions even when countermeasures, like adaptive equalizations and forward error control are used. The multicarrier modulation technique may be an alternative to tackle the effects of the fading. The performance analysis of multicarrier systems can be made based on the signature area. The aim of this work is to determine the performance of low complexity Block Coded Multicarrier Modulation (BCMCM), with space rectangular interleaving. The simulation results present a significant signature area reduction on the Rummler?s model channel compared to the single carrier coded modulation systems with adaptive equalization, for a specific threshold bit error rate

ASSUNTO(S)

sistemas de radio-interligação sistemas de radio - propagação da troposfera modulação digital codigos de controle de erros (teoria da informação)

ACESSO AO ARTIGO

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