Joint power and channel allocation for outage probability minimization in cognitive radio ad hoc networks

Abstract

This paper considers optimal resource allocation in integrated framework of cognitive radio and ad hoc network. The design problem looks for an optimal solution in power and channel allocation in multihop cognitive radio network (CRN) with linear topology. The overall goal is to minimize outage probability and enhancement in network lifetime, while meeting the limits of total transmit power and interference threshold to primary user (PU) simultaneously. The problem has been solved using standard technique of solving convex optimization problem and weighted bipartite matching. Simulation results show that the proposed scheme not only minimizes outage probability better compared to existing (only) power allocation strategies but also reduces interference to PU and saves sum transmission power of secondary users (SUs). Furthermore, in view of the energy constraints of the nodes in cognitive radio ad hoc networks, the solution is extended to address the issue of the network lifetime improvement. Simulation results confirm that our extended solution offers better network lifetime, although it shows slightly inferior performance in terms of minimizing outage probability compared to our initial solution.