Blind interference alignment with diversity in K-User interference channels

Yi Lu, Wei Zhang, Khaled B. Letaief

Research output: Contribution to journalArticle

30 Citations (Scopus)


In this paper, we propose blind interference alignment (BIA) schemes using reconfigurable antenna technology to achieve high degree of freedom (DoF) or diversity gain in K-user interference channels. First, two DoF-oriented BIA schemes are proposed that fully and partially align the inter-user interference, respectively. We compare the achievable DoF of the two schemes and show that the partial BIA scheme has higher DoF than the full BIA scheme under some conditions, and vice versa. Then, three diversity-oriented BIA schemes with space-time coding are proposed to achieve both spatial diversity gain and reconfigurable antenna pattern diversity gain. With different tradeoffs among the diversity gain, the rate and the decoding complexity, the BIA with threaded algebraic space-time (TAST) codes, the BIA with orthogonal space-time block codes (OSTBCs), and the BIA with multiplexing Alamouti codes are proposed, respectively. The BIA with TAST codes can achieve the full diversity and high rate with high decoding complexity. The BIA with OSTBCs can achieve the full diversity and the linear decoding complexity but has low rate. The BIA with multiplexing Alamouti codes can achieve high rate with low decoding complexity at the expense of full diversity loss.

Original languageEnglish
Article number6844854
Pages (from-to)2850-2859
Number of pages10
JournalIEEE Transactions on Communications
Issue number8
Publication statusPublished - Aug 2014



  • Interference channels
  • blind interference alignment
  • degree of freedom
  • diversity
  • space-time codes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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