Power Control Algorithm based on Non-Cooperative Game in Cognitive Radio Underlay Mode
Xiaojuan Bai, pan pan Cao, Zhijie Jin · 2022
In the Cognitive radio underlay mode, spectrum utilization is improved by allowing primary users (PUs) and cognitive users (CUs) to coexist in the same frequency band, while multiple secondary users must interfere with the primary and other secondary users when using authorized spectrum resources. Therefore, this paper designs a new utility function for the interference problems and excessive power consumption problems existing in the existing power control algorithms. Based on the premise that in cognitive radio networks, cognitive users can use a non-cooperative game approach to reduce the transmit power of each cognitive user under the premise of satisfying the target signal-to-interference-plus-noise ratio(SINR), a new power control algorithm based on this utility function is proposed, aiming to reduce the power consumption caused by the SINR of some CUs exceeding the target value; and the existence and uniqueness of the Nash equilibrium is proved theoretically. Simulation results show that, compared with the classical NPCG algorithm and K-G algorithm, this algorithm can reduce the transmission power of cognitive users while guaranteeing the service volume of authorized and cognitive users, thus reducing the inter-user interference and improving the performance of the network.