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Exploring the interference-emitting friendly jammers to protect the sensitivecommunications in the presence of eavesdroppers has increasingly beinginvestigated in literature. In parallel, scavenging energy from abient radiosignals for energy-constrained devices, namely \emph{wireless energyharvesting} (WEH), has also drawn significant attention. Without relying onexternal energy supply, the wireless-powered friendly jammer by WEH fromlegitimate wireless devices is an effective approach to prolong their lifetimeand gain the flexibility in deployments. This paper studies the onlineoptimization of the placement and WEH of a set of friendly jammers in ageographic location with the energy-efficiency (EE) consideration. We adopt asimple "time switching" protocol where power transfer and jammer-assistedsecure communications occur in different time blocks when WEH requests arelaunched. Our scheme has the following important advantages: 1) The proposedonline jammers placement and interfering power allocation to attackeavesdroppers is the first distributed and scalable solutions within anyspecified geographic region, 2) We model the WEH for jammers as a \emph{JAM-NETlifetime maximization problem}, where online scheduling algorithms withheterogeneous energy demands of each jammer (from energy sources) are designed,3) Under our model, the problem of placing a minimum number of jammers withdistance-based power assignments is NP-hard, and near optimal PTASapproximation algorithms are provided, 4) When durations of the eavesdroppingand legitimate communicating are available and the scenario is extended to themulti-channels setting, our results are strengthened to see further improved EEand reduced number of jammers. Simulations back up our theory.

Secure Communication through Wireless-Powered Friendly Jamming: Jointly Online Optimization over Geography, Energy and Time