We consider a relay-assisted wireless network, where the energy-harvestingbuffer-aided relay node is powered by radio-frequency signals from a sourcenode wishing to communicate with its destination. We propose two securecooperative protocols for a network composed of a source node equipped with adata buffer communicating with its destination in the presence of abuffer-aided relay node and an eavesdropper. Our proposed protocols aredesigned based on the channel state information and the buffer stateinformation at the source and relay nodes. The burstiness of data at the sourcenode queue (buffer) and the energy recycling process at the relay are takeninto account in our analysis. In addition, we take the decoding and signalprocessing circuit power consumption constraints into consideration. For thelimiting case of an infinite-size battery at the relay, we derive a sufficientcondition for the energy queue to saturate. Our numerical results demonstratethe throughput gains of our proposed protocols.
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