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This paper investigates the system outage performance of a simultaneouswireless information and power transfer (SWIPT) based two-waydecode-and-forward (DF) relay network, where potential hardware impairments(HIs) in all transceivers are considered. After harvesting energy and decodingmessages simultaneously via a power splitting scheme, the energy-limited relaynode forwards the decoded information to both terminals. Each terminal combinesthe signals from the direct and relaying links via selection combining. Wederive the system outage probability under independent but non-identicallydistributed Nakagami-m fading channels. It reveals an overall system ceiling(OSC) effect, i.e., the system falls in outage if the target rate exceeds anOSC threshold that is determined by the levels of HIs. Furthermore, we derivethe diversity gain of the considered network. The result reveals that when thetransmission rate is below the OSC threshold, the achieved diversity gainequals the sum of the shape parameter of the direct link and the smaller shapeparameter of the terminal-to-relay links; otherwise, the diversity gain iszero. This is different from the amplify-and-forward (AF) strategy, under whichthe relaying links have no contribution to the diversity gain. Simulationresults validate the analytical results and reveal that compared with the AFstrategy, the SWIPT based two-way relaying links under the DF strategy are morerobust to HIs and achieve a lower system outage probability.

System Outage Probability and Diversity Analysis of SWIPT Enabled Two-Way DF Relaying under Hardware Impairments