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

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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, 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.
Original languageEnglish
Pages (from-to)1-6
Number of pages5
JournalIEEE Wireless Communications Letters
DOIs
Publication statusPublished - 2019 Dec 2

Subject classification (UKÄ)

  • Communication Systems

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