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A Case Study on the Influence of Multiple Users on the Effective Channel in a Massive MIMO System

Bengtsson, Erik L LU ; Flordelis i Minguez, José LU ; Rusek, Fredrik LU ; karlsson, Peter C. ; Tufvesson, Fredrik LU and Edfors, Ove LU (2019) In IEEE Wireless Communications Letters p.1-6
Abstract
We investigate the importance of weak clusters when modeling a wireless massive MIMO channel. We do this by studying the influence of densely spaced terminals and the number of base-station antennas for a zero-forcing precoded massive MIMO system. In particular, we focus on the influence on the correlation and imbalance between the signals at the terminal antennas, the effective channel-gain, the eigenvalue distributions and the number of clusters.
The study is based on measured radio-channels from terminal prototypes with integrated antennas connected to a massive MIMO testbed.
We further evaluate the advantage of using block-diagonalized zero-forcing compared to conventional zero-forcing in a massive MIMO system. Unexpectedly,... (More)
We investigate the importance of weak clusters when modeling a wireless massive MIMO channel. We do this by studying the influence of densely spaced terminals and the number of base-station antennas for a zero-forcing precoded massive MIMO system. In particular, we focus on the influence on the correlation and imbalance between the signals at the terminal antennas, the effective channel-gain, the eigenvalue distributions and the number of clusters.
The study is based on measured radio-channels from terminal prototypes with integrated antennas connected to a massive MIMO testbed.
We further evaluate the advantage of using block-diagonalized zero-forcing compared to conventional zero-forcing in a massive MIMO system. Unexpectedly, terminals with low antenna envelope correlation coefficient may benefit significantly from block-diagonal zero-forcing in a massive MIMO system.
The main conclusion is that weaker clusters are important when modeling multi-user scenarios. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
IEEE Wireless Communications Letters
pages
5 pages
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
ISSN
2162-2337
DOI
10.1109/LWC.2019.2957077
language
English
LU publication?
yes
id
36538307-3b27-461b-8e7b-cdb139280681
date added to LUP
2019-12-06 09:39:40
date last changed
2019-12-06 11:36:58
@article{36538307-3b27-461b-8e7b-cdb139280681,
  abstract     = {We investigate the importance of weak clusters when modeling a wireless massive MIMO channel. We do this by studying the influence of densely spaced terminals and the number of base-station antennas for a zero-forcing precoded massive MIMO system. In particular, we focus on the influence on the correlation and imbalance between the signals at the terminal antennas, the effective channel-gain, the eigenvalue distributions and the number of clusters.<br/>The study is based on measured radio-channels from terminal prototypes with integrated antennas connected to a massive MIMO testbed.<br/>We further evaluate the advantage of using block-diagonalized zero-forcing compared to conventional zero-forcing in a massive MIMO system. Unexpectedly, terminals with low antenna envelope correlation coefficient may benefit significantly from block-diagonal zero-forcing in a massive MIMO system.<br/>The main conclusion is that weaker clusters are important when modeling multi-user scenarios.},
  author       = {Bengtsson, Erik L and Flordelis i Minguez, José and Rusek, Fredrik and karlsson, Peter C. and Tufvesson, Fredrik and Edfors, Ove},
  issn         = {2162-2337},
  language     = {eng},
  month        = {12},
  pages        = {1--6},
  publisher    = {IEEE - Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Wireless Communications Letters},
  title        = {A Case Study on the Influence of Multiple Users on the Effective Channel in a Massive MIMO System},
  url          = {https://lup.lub.lu.se/search/ws/files/72831667/MUMIMO_minor_final.pdf},
  doi          = {10.1109/LWC.2019.2957077},
  year         = {2019},
}