Accumulate and Jam: Towards Secure Communication via A Wireless-Powered Full-Duplex Jammer
Ying Bi, He Chen

TL;DR
This paper proposes a new secure communication protocol using a full-duplex energy-harvesting jammer that adaptively switches between energy harvesting modes to enhance physical layer security against eavesdroppers.
Contribution
It introduces the accumulate-and-jam (AnJ) protocol with practical energy storage modeling and analyzes its secrecy performance under various conditions.
Findings
AnJ outperforms half-duplex jamming in secrecy metrics.
Closed-form expressions for secrecy outage probability are derived.
Energy harvesting modes significantly impact security performance.
Abstract
This paper develops a new cooperative jamming protocol, termed accumulate-and-jam (AnJ), to improve physical layer security in wireless communications. Specifically, a full-duplex (FD) friendly jammer is deployed to secure the direct communication between source and destination in the presence of a passive eavesdropper. We consider the friendly jammer as an energy-constrained node without embedded power supply but with an energy harvesting unit and rechargeable energy storage; it can thus harvest energy from the radio frequency (RF) signals transmitted by the source, accumulate the energy in its battery, and then use this energy to perform cooperative jamming. In the proposed AnJ protocol, based on the energy status of the jammer and the channel state of source-destination link, the system operates in either dedicated energy harvesting (DEH) or opportunistic energy harvesting (OEH)…
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