Improved power control algorithm based on non-cooperative game in cognitive radio

In cognitive radio network, where Cognitive Users(CUs)share spectrum bandwidth with the Primary Users(PUs), it is necessary for cognitive users to perform power control to guarantee their QoS and avoid affecting PUs. In this paper, an improved power control algorithm based on non-cooperative game(IPC-NG)is proposed, with cost functions based on link gains and interference temperature. It is proved that the Nash equilibrium exists uniquely for the new net utility function through mathematical derivation and theoretical analyses. In the meantime, the convergence rate of the algorithm is analysed. Simulation results show that the algorithm not only avoids the influence for PU and guarantees the QoS of CUs, but also increases the system throughput and net utility.