In cognitive radio system, spectrum reuse is one of the main methods to improve the utilization of spectrum resources. Nevertheless, it has been unable to further improve spectrum efficiency that the reuse is implemented exclusively from the dimension of frequency. Taking account of the problem of spectrum resource spatial reuse in addition to the reuse of frequency, and aiming at the problem of the network transmission power optimization based on spectrum resource spatial reuse method in cognitive network, this paper proposes a spectrum resource spatial reuse algorithm based on Game Theory. Game theory is used by the algorithm to establish a game model of spectrum resources spatial reuse. A price function based on the channel quality is introduced to ensure the fairness of cognitive user to allocate power in each channel. A successive over relaxation iteration algorithm is used to solve the Nash equilibrium. Simulation results confirm that the proposed algorithm not only has high reliable detection performance to reduce the total transmission power, but also can ensure the service quality of cognitive users.
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