Interference Cancelation Based Opportunistic Relaying with Multiple Decode-and-Forward Relays

In this paper, we propose an opportunistic relaying with multiple decode-and-forward (DF) relay nodes based on interference cancelation (IC). The relay that succeeds decoding data in the former phase performs IC to decode another data in the current phase without suffering from interference caused by the selected best relay that forwards the data of the former phase. It is shown that the proposed scheme compensates for the loss of spectral efficiency caused by half duplexing relay nodes when the number of relays is large or SNR is high. In a whole systemic view, the proposed system asymptotically works as a single full-duplex transceiver. Our analytical and numerical results confirm that the proposed scheme outperforms the opportunistic single selection relaying with DF in terms of outage capacity when the number of relays is large or SNR is high.