Outage and Decoding Delay Analysis of Full-Duplex DF Relaying: Backward or Sliding Window Decoding

We investigate the outage and decoding-delay performances for full-duplex (FD) decode-forward (DF) relaying with backward and sliding window decoding. In our analysis, we consider a block fading channel with full channel state information (CSI) availability at receivers and with limited CSI at transmitters. For backward decoding where the destination starts decoding from the last transmission block, we derive the average block decoding delay. For sliding window decoding, we analyze both joint and sequential decoding where the destination utilizes two received blocks either simultaneously or sequentially to decode the source data. We then derive their average block decoding delays and outage performances by considering channel variation over two transmission blocks and outage events at both the relay and the destination. When comparing FD relaying with backward decoding and half-duplex (HD) transmission, numerical results show that joint sliding-window decoding is the preferred choice in terms of complexity, decoding delay and outage performances.