Distributed space-time block coded OFDM for relay-assisted transmission

Hakam Mheidat, Murat Uysal, Naofal Al-Dhahir

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this paper, we investigate orthogonal frequency division multiplexing (OFDM) technique for distributed spacetime block coding (D-STBC) in a relay-assisted transmission scenario over frequency-selective fading channels. We consider the special case of a single-relay where the source-to-relay (S → R), relay-to-destination (R → D) and source-to-destination (S → D) links experience possibly different channel delay spreads. Our analysis demonstrates that uncoded distributed OFDM-STBC (D-OFDM-STBC) scheme achieves a maximum diversity order of two for the considered single-relay scenario since it is able to exploit only the spatial diversity, but not the available rich multipath diversity. We further consider a combination of D-OFDM-STBC and Trellis Coded Modulation (TCM) with frequency-interleaving. Under the assumption of perfect power control for the relay terminal and high signal-to-noise ratio for the underlying links, our performance analysis demonstrates that D-OFDM-STBC scheme with judiciously designed outer TCM codes, i.e. sufficiently large effective code length (ECL), is able to achieve a maximum diversity order of min(L1, L3) + L2 + 2 where L1, L2, and L3 are the channel memory lengths for S → R, S → D and R → D links, respectively. This illustrates that the smaller of the multipath diversity orders experienced in S → R and R → D links becomes the performance bottleneck for the relaying path. An extensive Monte Carlo simulation study is presented to corroborate the analytical results and to provide further insights into the performance.

Original languageEnglish (US)
Title of host publication2006 IEEE International Conference on Communications, ICC 2006
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages7
ISBN (Print)1424403553, 9781424403554
StatePublished - 2006
Event2006 IEEE International Conference on Communications, ICC 2006 - Istanbul, Turkey
Duration: Jul 11 2006Jul 15 2006

Publication series

NameIEEE International Conference on Communications
ISSN (Print)0536-1486


Other2006 IEEE International Conference on Communications, ICC 2006


  • Cooperative diversity
  • Distributed space-time block coding
  • Fading channels
  • OFDM
  • Pairwise error probability

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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