The Feasibility of Interference Alignment for MIMO Interfering Broadcast - Multiple-Access Channels

Sang Woon Jeon, Kiyeon Kim, Janghoon Yang, Dong Ku Kim

Research output: Contribution to journalArticle

13 Citations (Scopus)


The feasibility conditions of interference alignment (IA) are analyzed for interfering broadcast-multiple-access channels in which one cell operates as downlink but the other cell operates as uplink. Under a general multiple-input and multiple-output antenna configuration, a necessary condition and a sufficient condition for one-shot linear IA are established, i.e., linear IA without symbol or time extension. In various example networks of interest, the optimal sum degrees of freedom (DoFs) are characterized by the derived necessary condition and sufficient condition. For symmetric DoF within each cell, a sufficient condition is established in a more compact expression, which yields the necessary and sufficient condition for a class of symmetric DoFs. An iterative construction of transmit and receive beamforming vectors is further proposed, which provides a specific beamforming design satisfying one-shot IA. Simulation results demonstrate that the proposed IA not only achieves larger DoF, but also significantly improves the sum rate over the single-cell operation in the practical signal-to-noise ratio regime.

Original languageEnglish
Article number7924412
Pages (from-to)4614-4625
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number7
Publication statusPublished - 2017 Jul

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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