Codebook-based interference alignment for uplink MIMO interference channels

Hyun Ho Lee, Ki Hong Park, Young Chai Ko, Mohamed Slim Alouini

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In this paper, we propose a codebook-based interference alignment (IA) scheme in the constant multiple-input multipleoutput (MIMO) interference channel especially for the uplink scenario. In our proposed scheme, we assume cooperation among base stations (BSs) through reliable backhaul links so that global channel knowledge is available for all BSs, which enables BS to compute the transmit precoder and inform its quantized index to the associated user via limited rate feedback link.We present an upper bound on the rate loss of the proposed scheme and derive the scaling law of the feedback load tomaintain a constant rate loss relative to IA with perfect channel knowledge. Considering the impact of overhead due to training, cooperation, and feedback, we address the effective degrees of freedom (DOF) of the proposed scheme and derive the maximization of the effective DOF. From simulation results, we verify our analysis on the scaling law to preserve the multiplexing gain and confirm that the proposed scheme is more effective than the conventional IA scheme in terms of the effective DOF.

Original languageEnglish
Pages (from-to)18-25
Number of pages8
JournalJournal of Communications and Networks
Volume16
Issue number1
DOIs
Publication statusPublished - 2014

Keywords

  • Effective degrees of freedom (DOF)
  • Interference alignment (IA)
  • Limited feedback
  • Multiplexing gain
  • Uplink multiple input multiple output(MIMO) interference channel (IC)

ASJC Scopus subject areas

  • Information Systems
  • Computer Networks and Communications

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