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

Erik L Bengtsson; José Flordelis i Minguez; Fredrik Rusek; Peter C. karlsson; Fredrik Tufvesson; Ove Edfors

doi:10.1109/LWC.2019.2957077

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

Erik L Bengtsson, José Flordelis i Minguez, Fredrik Rusek, Peter C. karlsson, Fredrik Tufvesson, Ove Edfors

Sony Mobile Communications AB

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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 language	English
Pages (from-to)	1-6
Number of pages	5
Journal	IEEE Wireless Communications Letters
DOIs	https://doi.org/10.1109/LWC.2019.2957077
Publication status	Published - 2019 Dec 2

Subject classification (UKÄ)

Communication Systems

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10.1109/LWC.2019.2957077

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

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.",

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doi = "10.1109/LWC.2019.2957077",

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T1 - A Case Study on the Influence of Multiple Users on the Effective Channel in a Massive MIMO System

AU - Bengtsson, Erik L

AU - Flordelis i Minguez, José

AU - Rusek, Fredrik

AU - karlsson, Peter C.

AU - Tufvesson, Fredrik

AU - Edfors, Ove

PY - 2019/12/2

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N2 - 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.

AB - 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.

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DO - 10.1109/LWC.2019.2957077

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JO - IEEE Wireless Communications Letters

JF - IEEE Wireless Communications Letters

ER -

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

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