Research Of Spectrum Allocation Algorithm On Dynamic Game Theory

Static and fixed spectrum allocation method combined with the great demand for spectrum resulted from the rapid development of wireless technology led to the lack of spectrum resources. Cognitive radio, an opportunistic spectrum access technology, can fundamentally improve the utilization of spectrum. Game theory, as a kind of effective mathematics method, was often applied to such researches about dynamic spectrum allocation. Spectrum allocation among primary users and secondary users in cognitive radio networks was discussed based on game theory in this paper, specific research contents are as follows:In order to complete spectrum allocation between one primary user and many secondary users in a cognitive radio network, system model was built based on the cognitive radio network’s features at first. Then Cournot model of game theory was built, secondary users were players and spectrum were strategy in which respectively.Spectrum price was set by primary users in priority. The level difference between different spectrum was considered to improve primary user’s utility function.Secondary users played based on their spectrum purchase to maintain the stable equilibrium. Finally the performance of improved algorithm was analyzed.In order to solve the problem of primary users’ pricing scheme in cognitive radio network in which multiple primary users and secondary users coexist. First of all cognitive radio system model was built and secondary users were as a whole. Bertrand game theory model was built on the basis of the cognitive model characteristics.Primary users were players, spectrum price was game strategy and primary users’ utility function was described by logarithmic function. Primary users obtained stable Nash equilibrium solution through playing game. At last spectrum pricing mechanism was concluded in cognitive radio network where multiple primary users and secondary users coexisted.In order to solve spectrum allocation problem between secondary users in cognitive radio networks where multiple primary users coexisted, secondary userswere take apart into several groups first of all. Then primary users played game based on Bertrand model of game theory to obtained stable pricing scheme. At last secondary users played game to complete spectrum allocation between secondary users.