Overlay Cognitive Radio in Wireless Mesh Networks
  In this paper we apply the concept of overlay cognitive radio to the communication between nodes in a wireless mesh network. Based on the overlay cognitive radio model, it is possible to have two concurrent transmissions in a given interference region, where usually only one communication takes place at a given time. We analyze the cases of wireless mesh networks with regular and random topologies. Numerical results show that considerable network capacity gains can be achieved. 
Ricardo Carvalho Pereira, Richard Demo Souza, Marcelo Eduardo Pellenz