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  • 1.
    Kim, Young-bin
    et al.
    KDDI Res Inc, Fujimino, Japan.
    Kang, Myung Gil
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Choi, Wan
    Korea Adv Inst Sci & Technol, Daejeon, South Korea.
    Diversity-Multiplexing Tradeoff of the Two-User X-channel with Two Antennas2019In: ICC 2019 - 2019 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), 2019Conference paper (Refereed)
    Abstract [en]

    Besides maximizing multiplexing gain. improving diversity is important for reliable communications in the presence of interference. In this context, on-off switched interference alignment (IA) is investigated, where IA is intermittently utilized by switching IA on/off in order to improve diversity gain in an interference channel and hence to maximize diversity multiplexing tradeoff (DMT). This paper adopts Alamouti coding based IA for the on-off switched IA, which requires only local channel state information at the transmitter. Optimizing the portion of IA utilization of the proposed scheme in closed form, we derive the achievable DMT and show that the intermittent utilization of IA with simultaneous non-unique decoding can improve DMT in the 2-user X-channel with two antennas. The proposed scheme, to the best of our knowledge, surpasses any other existing schemes for the 2-user X-channel with two antennas and is closed to the ideal DMT.

  • 2.
    Kim, Young-bin
    et al.
    KDDI Research, Inc., Saitama, Japan.
    Kang, Myung Gil
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Choi, Wan
    Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea.
    On-off Switched Interference Alignment for Diversity Multiplexing Tradeoff Improvement in the 2-User X-Network with Two Antennas2019In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 18, no 1, p. 546-558Article in journal (Refereed)
    Abstract [en]

    To improve diversity gain in an interference channel and hence to maximize diversity multiplexing tradeoff (DMT), we propose on-off switched interference alignment (IA) where IA is intermittently utilized by switching IA on/off. For on-off switching, either IA with symbol extension or IA with Alamouti coding is adopted in this paper. Deriving and analyzing DMT of the proposed schemes, we reveal that the intermittent utilization of IA with simultaneous non-unique decoding can improve DMT in the 2-user X-channel with two antennas. Both the proposed schemes are shown to achieve diversity gain of 4 and DoF per user of 4/3 . In particular, the on-off switched IA with Alamouti coding, to the best of our knowledge, surpasses any other existing schemes for the 2-user X-channel with two antennas and nearly approaches the ideal DMT. 

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CiteExportLink to result list
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Citation style
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  • ieee
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  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
More languages
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