Buffer-Aided Relaying for the Two-Hop Full-Duplex Relay Channel with Self-Interference

Mohsen Mohammadkhani Razlighi, Nikola Zlatanov

Research output: Contribution to journalArticleResearchpeer-review

41 Citations (Scopus)


In this paper, we investigate the fading two-hop full-duplex (FD) relay channel with self-interference, which is comprised of a source, an FD relay impaired by self-interference, and a destination, where a direct source-destination link does not exist. For this channel, we propose three buffer-aided relaying schemes with adaptive reception-transmission at the FD relay for the cases when the source and the relay both perform continuous-rate transmission with adaptive-power allocation, continuous-rate transmission with fixed-power allocation, and discrete-rate transmission, respectively. The proposed buffer-aided relaying schemes enable the FD relay to adaptively select to either receive, transmit, or simultaneously receive and transmit in a given time slot based on the qualities of the receiving, transmitting, and self-interference channels, a degree-of-freedom unavailable without buffer-aided relaying. Our numerical results show that significant performance gains are achieved using the proposed buffer-aided relaying schemes compared with conventional FD relaying, where the FD relay is forced to always simultaneously receive and transmit, and to buffer-aided half-duplex relaying, where the half-duplex relay cannot simultaneously receive and transmit. The main implication of this paper is that FD relaying systems without buffer-aided relaying miss-out on significant performance gains.

Original languageEnglish
Pages (from-to)477-491
Number of pages15
JournalIEEE Transactions on Wireless Communications
Issue number1
Publication statusPublished - 1 Jan 2018


  • Buffer-aided relaying
  • full-duplex
  • self-interference

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