Channel Correlation Diversity in MU-MIMO Systems - Analysis and Measurements

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Abstract

In multiuser multiple–input multiple–output (MU–MIMO) systems, channel correlation is detrimental to system performance. We demonstrate that widely used, yet overly simplified, correlation models that generate identical correlation profiles for each terminal tend to severely underestimate the system performance. In sharp contrast, more physically motivated models that capture variations in the power angular spectra across multiple terminals, generate diverse correlation patterns. This has a significant impact on the system performance. Assuming correlated Rayleigh fading and downlink zero–forcing precoding, tight closed form approximations for the average signal–to–noise–ratio, and ergodic sum spectral efficiency are derived. Our expressions provide clear insights into the impact of diverse correlation patterns on the above performance metrics. Unlike previous works, the correlation models are parameterized with measured data from a recent 2.53 GHz urban macrocellular campaign in Cologne, Germany. Overall, results from this paper can be treated as a timely re–calibration of performance expectations from practical MU–MIMO systems.

Details

Authors
  • Harsh Tataria
  • Seun Sangodoyin
  • Andreas Molisch
  • Peter J Smith
  • Michail Matthaiou
  • Jianzhong (Charlie) Zhang
  • Reiner S Thoma
Organisations
External organisations
  • Victoria University of Wellington
  • University of Cape Town
  • Queen's University Belfast
  • Samsung Electronics, Co., Ltd.
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Communication Systems

Keywords

  • Correlation diversity, Channel measurements, MU-MIMO systems, ZF precoding
Original languageEnglish
Title of host publicationIEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)
Number of pages7
Publication statusAccepted/In press - 2019 Jun 7
Publication categoryResearch
Peer-reviewedYes
EventIEEE International Symposium on Personal, Indoor and Mobile Radio Communications - Istanbul Congress Center , Istanbul, Turkey
Duration: 2019 Sep 82019 Sep 11
http://pimrc2019.ieee-pimrc.org/

Conference

ConferenceIEEE International Symposium on Personal, Indoor and Mobile Radio Communications
Abbreviated titleIEEE PIMRC
CountryTurkey
CityIstanbul
Period2019/09/082019/09/11
Internet address

Bibliographic note

Submitted for publication to IEEE PIMRC 2019, Istanbul, Turkey