عنوان مقاله [English]
In the recent years the growth of wireless communications technology and its application in the development of new data services creates new challenges in the research field of data communications and networking. For example, in the field of intelligent transport systems, the concept of vehicular ad-hoc networking is presented. Because of the broadcast nature of radio environment, there are always opportunities for the network attackers to affect wireless communications systems. Hence, the issue of security for the transmission of sensitive data is of great importance. In the physical layer of the network, the attack may occur in the form of signal jamming or eavesdropping. In this paper, a defensive mechanism is designed using transmitter power control to reduce the damaging effects of these two physical layer attacks. Using a game-theoretic formulation, the mechanism optimizes OFDM subcarrier powers at both the main data transmitter and the attacker in order to improve the security of the communication channel (secrecy capacity). As an application of the proposed method, simulation results are provided for a vehicular ad-hoc network (VANET) scenario based on the IEEE802.11p standard.