Abstract:

A non-cooperative power control algorithm based on game theory was proposed in cognitive radio systems, and its Nash equilibrium existence and uniqueness were also proved. However, some users'SINR is much larger than the target value in the proposed algorithm, causing power waste. Aiming at improving it, a feedback function was presented to design a mechanism of penalty factor self-adaptive adjustment on the basis of the algorithm. The numerical simulation results show that, compared with other distributed algorithms, the proposed algorithm, in the premise of meeting the primary user' QoS requirements, is able to ensure that all cognitive users' output SINR meet the threshold requirements, reduce the power consumption and overcome the near-far effect to achieve the purpose of the fair sharing of spectrum resources.

Key words: cognitive radio, non-cooperative game, power control, adaptive feedback