Subcarrier Allocation and Cooperative Partner Selection Based on Nash Bargaining Game for Physical Layer Security in OFDM Wireless Networks

摘要

Most orthogonal frequency division multiplexing (OFDM) cooperative schemes in wireless communicationrnsystem are poor in secure transmission. Based on the Nash bargaining game (NBG), this paper presents arnmethod of OFDM system cooperative scheme restricted in physical layer security. In the model, eachrnwireless node can act as not only a source node, but also a potential relay node. The sub-carrier allocationrnproblem among selfish nodes is formulated as a two-persons bargaining game to guarantee fairness. It isrnproved that the Nash bargaining solution (NBS) of sub-carriers allocation is existence of unique Nashrnequilibrium. Based on the bargaining algorithm and the Hungarian method, a multiple-users partnerrnselection algorithm is proposed in this paper. Simulation results indicate that the subcarrier allocationrnfairness is dependent on how much rate increase its partner can make. The proposed partner selectionrnalgorithm based on the Hungarian method can improve the overall secrecy rate of the network.