Performance of virtual full-duplex relaying on cooperative multi-path relay channels

Qiang Li, Manli Yu, Ashish Pandharipande, Xiaohu Ge, Jiliang Zhang, Jie Zhang

Research output: Contribution to journalArticleAcademicpeer-review

31 Citations (Scopus)


We consider a cooperative multi-path relay channel (MPRC) where multiple half-duplex relays assist in the packet transmissions from a source to its destination. A virtual full-duplex (FD) relaying scheme is proposed that allows the source to transmit a new packet simultaneously with the selected best relay, with the rest of the relays attempting to decode this new packet. Thus, a new source packet can be served in each time slot, as in FD relay systems. Taking into account the effect of inter-relay interference (IRI) that is caused by simultaneous relay and source transmissions, a Markov chain analytical model is used to characterize the decoding performance at the relays, based on which the overall outage probability of MPRC is obtained in closed-form expressions. The asymptotic performance analysis reveals that in low rate scenarios, a close-to-full diversity order is achieved by the proposed scheme while substantially improving the spectrum efficiency. In high rate scenarios, the decoding performance of relays is limited by IRI and the system outage performance experiences an error floor. Simulation results demonstrate the performance gains of the proposed scheme by comparisons with existing half-duplex and FD relay systems in the literature.

Original languageEnglish
Article number7398165
Pages (from-to)3628-3642
Number of pages15
JournalIEEE Transactions on Wireless Communications
Issue number5
Publication statusPublished - 1 May 2016
Externally publishedYes


  • diversity
  • half-duplex and fullduplex
  • Markov chain
  • Multi-path relay channels
  • opportunistic relaying


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