Strategic Antieavesdropping Game for Physical Layer Security in Wireless Cooperative Networks

This paper deals with the secure communication issues of wireless cooperative networks in the presence of multiple friendly but selfish intermediate nodes. On account of the broadcast nature of wireless communications, it is assailable to malicious eavesdropping. To tackle this challenge in the paper, we present a relay and jammer selection strategy that selects the jammer and relay nodes from intermediate nodes to improve the security of the eavesdropping attacks. The jammer is used to broadcast artificial interference noise on the eavesdropper. The relay acts as a traditional relay that retransmits source signal from the source to the intended destination. For achieving the maximum secrecy capacity by the selected nodes, we introduce a power allocation approach of intermediate nodes that is formulated as a Bertrand game based on price competition. We prove that an optimal pricing scheme can maximize the secrecy capacity and achieve the optimal profits for the selfish friendly nodes. Then, a new particle swarm with simulated anneal optimization algorithm is employed to obtain the solution of pricing and node selection. Finally, the simulation results verify our theoretical analysis.

I. Introduction

Wireless cooperative networks consist of some cooperative communication nodes that can improve communication capability and provide a fertile environment for the service deployment. With the broadcast nature of wireless communications, anyone who takes part in the network can overhear and possibly extract useful information. Since it is easy to be intercepted, how to improve the communication safety is of great importance and many approaches have been proposed to protect the security information [1], [2].