Abstract
Cooperative relaying is an effective technology to improve the capacity of physical-layer security, in which the relay helps forward the received signal to the destination. In this paper, a cooperative compressive sensing and amplify-and-forward (CCS-AF) scheme, which combines the compressive sensing theory and amplify-and-forward strategy, is proposed to increase the secrecy capacity. To optimize the secrecy performance, a coalition formation algorithm based on coalitional game theory of optimal relay selection is proposed to maximize the secrecy capacity. Different to maximizing the individual utility based on the traditional pareto order, the max-coalition order rule is newly defined to guide the coalitional formation. Simulation results indicate that with the proposed algorithm, part of the relays could form a coalition to forward the information and the proposed algorithm could significantly improve the secrecy capacity of cooperative multi-relay networks.
Highlights
Security problems have always been of great importance in wireless communication
We find that secrecy capacity is not proportional to the number of relays and the secrecy capacity is sensitive to the source–relay distances
A distributed multi-relay selection algorithm based on the coalition formation
Summary
Security problems have always been of great importance in wireless communication. Traditionally, the transmitted data is encrypted by the keys to assurance the security. The distributed coalitional game has been studied in wireless networks, where users can self-organize into disjointed coalitions and maximize the secrecy capacity of each user [15,16,17]. Coalition game theory is utilized in [24] to select the optimal relay pairs for improving the secure key generation rate in D2D communications with nontrusted relays. The measurement matrix in [31] is the encryption key to encode the source’s signal, and the secrecy is ensured Those studies indicate that the measurement matrix can be used to achieve the physical-layer security without the channel state information of eavesdroppers. We propose a CCS-AF (cooperative compressed sensing amplify and forward) scheme for physical layer security in wireless sensor network, in which relays amplify and forward the received combined sources’ signals.
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