Interference alignment for multi-user MIMO interference channels via a Riemannian optimization approach

Fereidoun H. Panahi, Tomoaki Ohtsuki, Wenjie Jiang, Yasushi Takatori

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Interference alignment (IA) is a technique shown to be able to achieve a significant overall throughput in a μ - user multiple-input multiple-output (MIMO) interference channel (IC). In this paper, we try to modify the conventional IA designs to achieve enhanced sum-rate performance. We jointly design transmit and receive IA filters (precoding and suppression filters) at a central unit (CU) to reduce the channel state information (CSI) feedback/sharing overhead. At the CU, in a one-way iterative strategy (left 'L' to right 'R', see Fig. 1), the precoding filters are optimized (on side 'L') in the direction of the gradient of the sum-rate, and the suppression filters are chosen (on side 'R') to minimize the leakage interferences. Then, in a two-way iterative strategy, the proposed scheme alternates between 'L' and 'R' sides to design the IA filters through the joint sum-rate maximization and interference leakage minimization on each side. Finally, a modified version of the two-way iterative strategy is proposed to design the IA filters on the basis of signal-to-interference-plus-noise ratio (SINR) (instead of the interference minimization) and the sum-rate maximization techniques. Comparing to other conventional IA designs, the proposed designs with provable convergence show a significant sum-rate performance improvement and often outperform other widely used algorithms, as shown in the simulation examples.

Original languageEnglish
Title of host publicationIEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages287-292
Number of pages6
Volume2015-December
ISBN (Print)9781467367820
DOIs
Publication statusPublished - 2015 Dec 1
Event26th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2015 - Hong Kong, China
Duration: 2015 Aug 302015 Sep 2

Other

Other26th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2015
CountryChina
CityHong Kong
Period15/8/3015/9/2

Keywords

  • interference alignment (IA)
  • interference channel
  • optimization

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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  • Cite this

    Panahi, F. H., Ohtsuki, T., Jiang, W., & Takatori, Y. (2015). Interference alignment for multi-user MIMO interference channels via a Riemannian optimization approach. In IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC (Vol. 2015-December, pp. 287-292). [7343311] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PIMRC.2015.7343311