Secrecy Performance Analysis of Hybrid AF-DF Relaying Under Multi Hop Environment

摘要

In this work, a three-hop wireless relaying model comprising of a single source and destination node, along with two relay nodes and an eavesdropper is considered. We made a detailed performance analysis comparison between the multi-hop network and the conventional single-hop model by considering different parameters. Due to the broadcast behaviour of a wireless communication network the propagated message from the source is captured by both intended and an unintended receiver. This will lead to severe security breaches in a wireless medium, so providing fully secure communication is a critical issue. Physical layer security developed as a new archetype to afford security to a wireless communication network. Multi-hop networks are favourite over single-hop networks for better coverage extension and lower interference levels. To use the benefits of both, amplify and forward and decode and forward protocol collectively, a new scheme known as hybrid amplify decode and forward relaying based on signal to noise ratio is presented. The scheme is proposed for multi hop environment with secrecy capacity as a performance metric. Secrecy capacity of proposed scheme outperforms both AF and DF for different distance parameters and path loss exponent under multi-hop environment.