Esquemas Cooperativos Incrementais para Canais Relay de Múltiplo Acesso

In this work, a novel cooperative scheme is presented and an optimization is proposed for wireless communications systems with multiple relay channels (MARC ). The scheme aims at making the MARC systems more compatible with the current ones, by rendering its presence transparen t to the source nodes, thus significantly reducing the complexit y of the cooperative network synchronism. The optimization exp loits the context of multiple signal constellations, aiming at in creasing the robustness against transmission errors. A comparison w ith a reference scheme is carried out by computer simulations, and the results reveal that the proposed scheme matches well with cooperative networks with single-antenna relay stati on, presenting a small signal-to-noise ration (SNR) loss but a g ain in transmission rate. On the other hand, the proposed optimiza tion yields an SNR gain.