Abstract: The interaction and cooperation strategies among sources and friendly jammers to improve their secrecy capacity with physical layer security in a practical decentralized wireless network are investigated. The problem was formulated as a hedonic coalition formation game, and then a distributed hedonic coalition formation algorithm was proposed to achieve the stable coalition. Simulation results showed the proposed scheme could significantly improve the average payoffs per user comparing with the non-cooperative case and the amplify-and-forward case.

Key words: cooperative jamming, game theory, physical layer security, cooperative communication