Limited Feedback Design for Interference Alignment on Two-Cell Interfering MIMO-MAC

Myeong Jin Kim, Hyun Ho Lee, Young-Chai Ko

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

This paper considers limited feedback for a two-cell interfering multiple-input-multiple-output multiple-access channel (MIMO-MAC). We propose a QR decomposition-based interference alignment (QRD-IA) scheme for efficient limited feedback and investigate the conditions for the antenna configuration. We characterize the interference leakage caused by quantization error as a function of the number of feedback bits. To minimize the interference leakage, we further propose a quantized-precoder-based IA (QP-IA) scheme by modifying the proposed QRD-IA scheme. By characterizing the interference leakage of the QP-IA scheme, we investigate the number of feedback bits to maintain the degrees of freedom (DOFs) in the two-cell interfering MIMO-MAC and a feedback bit allocation algorithm to improve the sum rate. From simulation results, we demonstrate that our proposed schemes can provide better sum-rate performance than the existing scheme using the same number of feedback bits, and our feedback bit allocation algorithm provides a higher sum rate compared with equal feedback bit allocation.

Original languageEnglish
Article number6942267
Pages (from-to)4019-4030
Number of pages12
JournalIEEE Transactions on Vehicular Technology
Volume64
Issue number9
DOIs
Publication statusPublished - 2015 Sep 1

Keywords

  • feedback bits allocation
  • interference alignment
  • limited feedback
  • matrix quantization
  • Two-cell interfering multiple-input multipleoutput multiple access channel

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Aerospace Engineering
  • Automotive Engineering
  • Computer Networks and Communications
  • Applied Mathematics

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