Opportunistic decouple-and-forward relaying: Harnessing distributed antennas

Jaeyoung Lee, Hyundong Shin, Jun Heo

Research output: Contribution to journalArticlepeer-review


In this paper, we consider decouple-and-forward (DCF) relaying, where the relay encodes and amplifies decoupled data using orthogonal space-time block codes (OSTBCs), to achieve the maximum diversity gain of multiple-input multiple-output (MIMO) amplify-andforward (AF) relaying. Since the channel status of all antennas is generally unknown and time-varying for cooperation in multi-antenna multiple-relay systems, we investigate an opportunistic relaying scheme for DCF relaying to harness distributed antennas and minimize the cooperation overheads by not using the global channel state information (CSI). In addition, for realistic wireless channels which have spatial fading correlation due to closelyspaced antenna configurations and poor scattering environments, we analyze the exact and lower bound on the symbol error probability (SEP) of the opportunistic DCF relaying over spatially correlated MIMO Rayleigh fading channels. Numerical results show that, even in the presence of spatial fading correlation, the proposed opportunistic relaying scheme is efficient and achieves additional performance gain with low overhead.

Original languageEnglish
Pages (from-to)1148-1156
Number of pages9
JournalIEICE Transactions on Communications
Issue number6
Publication statusPublished - 2014 Jun


  • Amplify-and-forward (AF) relaying
  • Multiple-input multiple-output (MIMO)
  • Orthogonal space-time block codes (OSTBCs)
  • Symbol error probability

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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