Hybrid demodulate-forward relay protocol for two-way relay channels

C.B. Luo, G. Parr, S.I. McClean, C. Peoples, X.H. Wang

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Two-Way Relay Channel (TWRC) plays an important role in relay networks, and efficient relaying protocols are particularly important for this model. However, existing protocols may not be able to realize the potential of TWRC if the two independent fading channels are not carefully handled. In this paper, a Hybrid DeModulate-Forward (HDMF) protocol is proposed to address such a problem. We first introduce the two basic components of HDMF - direct and differential DMF, and then propose the key decision criterion for HDMF based on the corresponding log-likelihood ratios. We further enhance the protocol so that it can be applied independently from the modulation schemes. Through extensive mathematical analysis, theoretical performance of the proposed protocol is investigated. By comparing with existing protocols, the proposed HDMF has lower error rate. A novel scheduling scheme for the proposed protocol is introduced, which has lower length than the benchmark method. The results also reveal the protocol's potential to improve spectrum efficiency of relay channels with unbalanced bilateral traffic.
Original languageEnglish
Pages (from-to)4328-4341
Number of pages14
JournalIEEE Transactions on Wireless Communications
Issue number8
Early online date3 Apr 2015
Publication statusPublished - 31 Aug 2015


  • decode and forward communication
  • fading channels
  • maximum likelihood estimation
  • protocols
  • relay networks (telecommunication)
  • telecommunication scheduling
  • HDMF protocol
  • TWRC
  • differential DMF
  • direct DMF
  • hybrid demodulate-forward protocol
  • independent fading channels
  • key decision criterion
  • log-likelihood ratios
  • mathematical analysis
  • novel scheduling scheme
  • relay networks
  • relaying protocols
  • spectrum efficiency
  • two-way relay channel
  • Demodulation
  • Error analysis
  • Noise
  • Phase shift keying
  • Relays
  • Log-likelihood ratio
  • Two-way
  • hybrid demodulate-forward
  • maximum likelihood detection
  • queue analysis
  • relay
  • scheduling


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