Joint interference and phase alignment in multiuser MIMO interference channels

Seyed Morteza Razavi, Tharmalingam Ratnarajah, Christos Masouros, Mathini Sellathurai

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

2 Citations (Scopus)

Abstract

It has been shown that interference alignment (IA) is able to achieve the capacity of wireless interference networks. However each node requires at least local channel state information (CSI) to align all interferences. After that, zero-forcing is needed to recover the d degrees of freedom related to each transceiver pair. In this paper we present a novel technique consisting of both interference and phase alignment in K-user multi-input multi-output (MIMO) interference systems employing M-ary phase-shift keying (M-PSK) modulation. We first utilize standard interference alignment (IA) to eliminate the interference caused by each transmitter to the other K - 1 receivers. Then instead of performing the zero-forcing (ZF) projections to extract the signal subspace, we utilize the availability of local CSI at each transmitter to align the phases of transmitted symbols such that they add up coherently at the intended receive node and therefore achieve maximum ratio combining (MRC) diversity gain of order d for each degree of freedom. We show that the proposed joint interference and phase alignment (JIPA) technique achieves better symbol error performance than ZF-based IA (ZFIA) and attains more instantaneous output SNR without the need to increase the transmitted power.

Original languageEnglish
Title of host publicationConference Record of the Forty Sixth Asilomar Conference on Signals, Systems and Computers (ASILOMAR), 2012
PublisherIEEE
Pages1137-1141
Number of pages5
ISBN (Print)978-1-4673-5051-8
DOIs
Publication statusPublished - 2012
Event46th Asilomar Conference on Signals, Systems and Computers 2012 - Pacific Grove, CA, United States
Duration: 4 Nov 20127 Nov 2012

Conference

Conference46th Asilomar Conference on Signals, Systems and Computers 2012
Abbreviated titleASILOMAR 2012
CountryUnited States
CityPacific Grove, CA
Period4/11/127/11/12

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing

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  • Cite this

    Razavi, S. M., Ratnarajah, T., Masouros, C., & Sellathurai, M. (2012). Joint interference and phase alignment in multiuser MIMO interference channels. In Conference Record of the Forty Sixth Asilomar Conference on Signals, Systems and Computers (ASILOMAR), 2012 (pp. 1137-1141). [6489198] IEEE. https://doi.org/10.1109/ACSSC.2012.6489198