The Research On Node Behaviors In Wireless Network Based On Game Theory

In recent years, the new technologies such as network coding, cooperative communication and cognitive radio are becoming the hot points in the field of wireless communications, which are proved to improve the network performance greatly. Compared with the traditional communication technology, these new technologies more dependent on the cooperation and cognitive of network nodes. However, some network nodes show the selfish behaviors without motivation mechanism of which the resources (energy, memory, bandwidth etc) are limited, and it has a direct impact on network performance. Moreover, the relevant technology such as cognitive radio requires that the CR user can use the corresponding band freely, so it is easy for the network nodes to wiretap information and jam communication, which has brought new safety problems for wireless communications. Therefore, the research on node behaviors in wireless network has significances to the performance and security of wireless network.In this paper, the node behaviors in wireless network are analyzed and researched using the game theory. The main works can be summarized as follows:(1) In order to improve the network performance, this paper analyses the selfish behaviors of node in wireless network based on network coding. A model of the repeated game for link nodes is established, and on the basis of the selfish behaviors of link node, we propose a strategy to balance the distribution of network flows.(2) This paper analyses the behaviors of node in MIMO Wiretap channel, and establishes a mode of game. Then the game result and secrecy rate are given for when the attacker in the mode has different strategies such as location, the number of antenna and the power or when there is a friendly relay in the mode.