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

Forskningsoutput: Tidskriftsbidrag › Artikel i vetenskaplig tidskrift › Peer review

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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.

Originalspråk	engelska
Sidor (från-till)	1-6
Antal sidor	5
Tidskrift	IEEE Wireless Communications Letters
DOI	https://doi.org/10.1109/LWC.2019.2957077
Status	Published - 2019 dec. 2

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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.",

author = "Bengtsson, {Erik L} and {Flordelis i Minguez}, Jos{\'e} and Fredrik Rusek and karlsson, {Peter C.} and Fredrik Tufvesson and Ove Edfors",

year = "2019",

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doi = "10.1109/LWC.2019.2957077",

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AU - Tufvesson, Fredrik

AU - Edfors, Ove

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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.

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

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