Enhanced physical layer security for energy harvesting relay-aided systems using joint relaying scheme

Article Type

Letter to the Editor

Publication Title

Internet Technology Letters


We investigate a dual-hop cooperative network with a rechargeable source node, a rechargeable half-duplex hybrid relay node, and a destination node. The network is assumed to be under attack from potential passive eavesdropper. The direct link between the source and destination is considered part of the system. Both the legitimate receiver and the eavesdropper employ maximal ratio combining (MRC) techniques. Batteries at the source and relay are modeled with finite capacities. We characterize the secure throughput of a relay that can dynamically switch between amplify-and-forward (AF), decode-and-forward (DF), and randomize-and-forward (RF) relaying schemes. In addition, the service rates of the queuing systems at the source and the relay as well as the overall secure throughput of the system are derived. Simulation results show how the energy arrival rate at the batteries and the energy consumed in transmitting a packet influence secure throughput. Moreover, we derive asymptotic expression of secure throughput by modeling the queues as M/D/1 queuing systems and show the impact of such modeling on the physical-layer security performance.



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