关键词: 认知无线电网络, 博弈论, 功率控制, 纳什均衡, 公平性

Abstract:  For the far-near fairness issue existing in the non-cooperative power control game algorithm, an efficient and unbiased power control algorithm via pricing is given in the uplink of a cognitive radio network where secondary users share the bandwidth with primary users. In this game model, the pricing punishment parameter setting depends on the quality of received signal to guarantee the quality of service requirement of the secondary users. The improved utility function balances the fairness and system throughput of secondary users. The existence of Nash equilibrium point for the proposed game is proven by supermodular game theory and then the iterative process for Nash equilibrium point of the transmit power is given finally. Simulation results show that the proposed game not only enhances the system throughput, reduces transmit power of secondary users, and improves the global utility, but also takes the throughput fairness for far-near secondary users into account.

Key words:  cognitive radio networks, game theory, power control, Nash equilibrium, fairness