Análise de desempenho de modulação adaptativa em rede de rádio cognitivo com múltiplo acesso Slotted Aloha

Cognitive radio technology using adaptive modulation techniques has been widely proposed in the literature as a promising solution to improve the performance of telecommunications networks. A key issue in the adaptive modulation technique is finding the optimum switching points between modulations. In this paper, we considered a cognitive radio network with concurrent spectrum access granted through the Slotted Aloha protocol. We analyzed the optimum switching points in this network are considering two criteria: delay and power metric.