Space-Constrained Massive MIMO: Hitting the Wall of Favorable Propagation

Christos Masouros; Michail Matthaiou

doi:10.1109/LCOMM.2015.2409832

Space-Constrained Massive MIMO: Hitting the Wall of Favorable Propagation

Christos Masouros, Michail Matthaiou

Research output: Contribution to journal › Letter › peer-review

68 Citations (Scopus)

311 Downloads (Pure)

Abstract

The recent development of the massive multiple-input multiple-output (MIMO) paradigm, has been extensively based on the pursuit of favorable propagation: in the asymptotic limit, the channel vectors become nearly orthogonal and interuser interference tends to zero [1]. In this context, previous studies
have considered fixed inter-antenna distance, which implies an increasing array aperture as the number of elements increases. Here, we focus on a practical, space-constrained topology, where an increase in the number of antenna elements in a fixed total space imposes an inversely proportional decrease in the inter-antenna distance. Our analysis shows that, contrary to existing studies, inter-user interference does not vanish in the massive MIMO regime, thereby creating a saturation effect on the achievable rate.

Original language	English
Pages (from-to)	771 - 774
Number of pages	4
Journal	IEEE Communications Letters
Volume	19
Issue number	5
DOIs	https://doi.org/10.1109/LCOMM.2015.2409832
Publication status	Published - 09 Mar 2015

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10.1109/LCOMM.2015.2409832

Space-Constrained Massive MIMO: Hitting the Wall of Favorable Propagation
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abstract = "The recent development of the massive multiple-input multiple-output (MIMO) paradigm, has been extensively based on the pursuit of favorable propagation: in the asymptotic limit, the channel vectors become nearly orthogonal and interuser interference tends to zero [1]. In this context, previous studieshave considered fixed inter-antenna distance, which implies an increasing array aperture as the number of elements increases. Here, we focus on a practical, space-constrained topology, where an increase in the number of antenna elements in a fixed total space imposes an inversely proportional decrease in the inter-antenna distance. Our analysis shows that, contrary to existing studies, inter-user interference does not vanish in the massive MIMO regime, thereby creating a saturation effect on the achievable rate.",

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AB - The recent development of the massive multiple-input multiple-output (MIMO) paradigm, has been extensively based on the pursuit of favorable propagation: in the asymptotic limit, the channel vectors become nearly orthogonal and interuser interference tends to zero [1]. In this context, previous studieshave considered fixed inter-antenna distance, which implies an increasing array aperture as the number of elements increases. Here, we focus on a practical, space-constrained topology, where an increase in the number of antenna elements in a fixed total space imposes an inversely proportional decrease in the inter-antenna distance. Our analysis shows that, contrary to existing studies, inter-user interference does not vanish in the massive MIMO regime, thereby creating a saturation effect on the achievable rate.

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Space-Constrained Massive MIMO: Hitting the Wall of Favorable Propagation

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