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This paper investigates a three-node multiple-input multiple-output relaysystem suffering from co-channel interference (CCI) at the multi-antenna relay.Contrary to the conventional relay networks, we consider the scenario that therelay is an energy harvesting (EH) node and has no embedded energy supply. Butit is equipped with a rechargeable battery such that it can harvest andaccumulate the harvested energy from RF signals sent by the source andco-channel interferers to support its operation. Leveraging the inherentfeature of the considered system, we develop a novel accumulate-then-forward(ATF) protocol to eliminate the harmful effect of CCI. In the proposed ATFscheme, at the beginning of each transmission block, the relay can chooseeither EH operation to harvest energy from source and CCI or informationdecoding (ID) operation to decode and forward source's information whilesuffering from CCI. Specifically, ID operation is activated only when theaccumulated energy at the relay can support an outage-free transmission in thesecond hop. Otherwise, EH operation is invoked at the relay to harvest andaccumulate energy. By modeling the finite-capacity battery of relay as afinite-state Markov Chain (MC), we derive a closed-form expression for thesystem throughput of the proposed ATF scheme over mixed Nakagami-m and Rayleighfading channels. Numerical results validate our theoretical analysis, and showthat the proposed ATF scheme with energy accumulation significantly outperformsthe existing one without energy accumulation.

Exploiting Energy Accumulation Against Co-channel Interference in Wireless Energy Harvesting MIMO Relaying