Regularized transceiver designs for multi-user MIMO interference channels

Seok Hwan Park, Haewook Park, Hakjea Sung, Inkyu Lee

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

For multi-user interference channels (IC), an altruistic approach based on the zero-forcing (ZF) criterion shows the near-optimal performance at high signal-to-noise ratio (SNR), whereas its performance at low SNR becomes poor compared to a simple egoistic algorithm (selfish beamforming). Thus, balancing between the egoism and the altruism has been an important issue to achieve good sum-rate performance at overall SNR regime. In this paper, we propose a new approach for enhancing the performance by regularizing the ZF based transceivers. To this end, we start with investigating efficient ZF transceivers for 2-user and 3-user ICs. First, coordinated spatial multiplexing (CSM) is proposed for 2-user IC. For the 3-user case, it is shown that the enhanced interference alignment (E-IA) introduced in our previous work is the optimal ZF transceivers in terms of the sum-rate performance. Next, to improve the performance of the CSM and E-IA schemes at low SNR, we propose a non-iterative regularization method under the high SNR approximation. The distributed implementation of the proposed regularization method is also presented where each node is able to compute its own precoding or decoding matrix using local channel state information. From simulations, it is observed that the proposed regularized design outperforms the conventional schemes in overall SNR regime. Also, we confirm that our distributed approach provides a substantial performance gain over the conventional distributed scheme with reduced computational complexity.

Original languageEnglish
Article number6253201
Pages (from-to)2571-2579
Number of pages9
JournalIEEE Transactions on Communications
Volume60
Issue number9
DOIs
Publication statusPublished - 2012

Keywords

  • Beamforming
  • MIMO interference channels
  • interference alignment

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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