In last years, demand for spectrum has increased. Due to the advancement of mobile industry in recent years, spectrum shortage has become a serious problem. It is clear that the traditional spectrum allocation is no longer effective, which will result in the lack of use of the bandwidth. Dynamic access to the spectrum is a solution to this problem. Also, the researchers have suggested cooperative communication to increase coverage and decrease fading effect. In cooperative communication, the source node and relay node send information to the destination. The combination of these two networks is taken into consideration. High efficiency, high rate, quality of link and full use of bandwidth are the advantages of this scenario. In this thesis, we particularity discuss about rate information. The cognitive radio network in this thesis consist of two primary users, multiple secondary users and one secondary destination user which is all secondary users have to send their information to it. The primary user select nodes from secondary users as a relay that is base on the power and the energy criterion. We aim to maximize the rate of network. To this end, we use game theory which is the primary user and the relays are players. The kind of the game perform as a recurrent method that the secondary users operate as a slave and the primary users (master), select their quantities that are based on the definite quantities has selected by secondary users. Based on the results which has obtained from simulation of all secondary networks that it could transmit data per specific time unit . Also, increasing number of relay, could decrease the rate of transmission that is based on the distance for both primary and secondary networks. All of optimum points for maximum power of secondary networks, the length of the time unit, Has been concluded from suggested system model. Keywords: Cooperative cognitive radio network, Transmission rate, Cooperative communication, Games theory.
