LAUSR

In this paper, an unlicensed relay is deployed to maintain wireless connection between an unlicensed source and an unlicensed destination in spectrum sharing paradigm when source-destination direct channel is unavailable. The relay is capable of energy scavenging (ES) from source signal and uses the scavenged energy to amplify-and-forward it to the destination. The relay’s information transmission is eavesdropped by a wire-tapper. For prompt system performance evaluation, the current paper suggests two closed-form formulas of eavesdropping outage probability at the wire-tapper and decoding outage probability at the destination under interference power limitation and peak transmit power limitation, from which eavesdropping-decoding compromise in the spectrum sharing paradigm with the ES-capable relay is recognized. Numerous results validate the analysis and expose that relay location, times of signal relaying and energy scavenging, received power distribution for signal processing and energy scavenging can be optimized to achieve the best eavesdropping-decoding compromise.