Quasi-orthogonal time-reversal space-time block coding for frequency-selective fading channels

Hakam Mheidat, Murat Uysal, Naofal Al-Dhahir

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Quasi-orthogonal space-time block codes (QO-STBCs) are a powerful code family designed for more than two transmit antennas. In contrast to their orthogonal counterparts designed for the same number of transmit antennas, QO-STBCs are able to provide full-rate transmission rate. While original QO-STBCs enjoy only a partial diversity, the recently proposed rotated versions of QO-STBCs achieve the maximum diversity order which is equal to the number of transmit antennas. Since QO-STBCs have been originally proposed for frequency-flat fading channels, it is a challenging design problem to apply them over frequency-selective channels. The dispersive nature of such channels results in intersymbol interference which needs to be carefully handled at the receiver. In this paper, we investigate time-domain equalization for QO-STBC, exploiting the embedded quasi-orthogonal structure to design low-complexity receivers. We also present diversity gains for the proposed scheme through pairwise error probability (PEP) derivation and analysis which are further confirmed by Monte Carlo simulations.

Original languageBritish English
Pages (from-to)772-778
Number of pages7
JournalIEEE Transactions on Signal Processing
Issue number2
StatePublished - Feb 2007


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


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