Cooperative Communication in Physical Layer Security: Technologies and Challenges

Cooperative communication utilizes node cooperation for enhancing the diversity gains during secure communication against eavesdropping and jamming which are the common threats to information security in wireless networks. This paper aims to provide the most recent survey on cooperative technologies to ensure a confidential link between legitimate nodes. First, an overview of cooperative relaying, jamming and hybrid methods used in cooperative communication has been presented. Further for each method, different techniques are categorized based on system model comparison, distinctly elaborating their performance and applications. Finally, future research directions are envisioned at the end of the paper.