Diversity of Coded Beamforming in MIMO-OFDM AF Relaying Systems with Direct Link

Han Bae Kong, Changick Song, Minki Ahn, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


This paper investigates the diversity order of beamforming schemes in frequency-selective multiple-input multiple-output (MIMO) amplify-and-forward (AF) relaying channels with a nonnegligible direct link between the source and the destination. In this system, orthogonal frequency-division multiplexing and bit-interleaved coded modulation schemes are adopted to exploit multipath diversity. Due to a nonconvex property of the problem, the optimal performance of flat-fading MIMO relaying channels, which is imperative to derive the diversity order, is still unknown. To this end, we first identify upper and lower bounds of the signal-to-noise ratio (SNR) of the flat-fading channels, which lead to upper and lower bounds of diversity order of coded beamforming in frequency-selective channels. Then, we establish the diversity order as a closed form by showing that these bounds are tight. In addition, our analysis provides an insightful guideline for code constructions to achieve a proper diversity gain of the system. The accuracy of our analysis is validated through simulation results.

Original languageEnglish
Article number6906260
Pages (from-to)3817-3822
Number of pages6
JournalIEEE Transactions on Vehicular Technology
Issue number8
Publication statusPublished - 2015 Aug 1

Bibliographical note

Publisher Copyright:
© 1967-2012 IEEE.

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics


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