Impact of Line-of-Sight and Unequal Spatial Correlation on Uplink MU-MIMO Systems

Harsh Tataria; Peter J Smith; Larry J. Greenstein; Pawel A Dmochowski; Michail Matthaiou

doi:10.1109/LWC.2017.2726062

Impact of Line-of-Sight and Unequal Spatial Correlation on Uplink MU-MIMO Systems

Harsh Tataria, Peter J Smith, Larry J. Greenstein, Pawel A Dmochowski, Michail Matthaiou

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

Abstract

Closed-form approximations of the expected per-terminal signal-to-interference-plus-noise-ratio (SINR) and ergodic sum spectral efficiency of a multiuser multiple-input multiple-output system are presented. Our analysis assumes spatially correlated Ricean fading channels with maximum-ratio combining on the uplink. Unlike previous studies, our model accounts for the presence of unequal correlation matrices, unequal Rice factors, as well as unequal link gains to each terminal. The derived approximations lend themselves to useful insights, special cases and show the combined impact of line-of-sight (LoS) and correlated components. Numerical results show that while unequal correlation matrices enhance the system performance, the presence of strong LoS has an opposite effect. The approximations are general and remain insensitive to changes in the system dimensions, signal-to-noise-ratios, LoS levels, and correlation levels.

Original language	English
Article number	7976368
Pages (from-to)	634-637
Number of pages	4
Journal	IEEE Wireless Communications Letters
Volume	6
Issue number	5
DOIs	https://doi.org/10.1109/LWC.2017.2726062
Publication status	Published - 2017 Oct 1
Externally published	Yes

Subject classification (UKÄ)

Communication Systems

Free keywords

Unequal spatial correlation
Line-of-sight
Ricean fading
Maximum-ratio combining
Ergodic spectral efficiency
Massive MIMO
Statistical analysis

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title = "Impact of Line-of-Sight and Unequal Spatial Correlation on Uplink MU-MIMO Systems",

abstract = "Closed-form approximations of the expected per-terminal signal-to-interference-plus-noise-ratio (SINR) and ergodic sum spectral efficiency of a multiuser multiple-input multiple-output system are presented. Our analysis assumes spatially correlated Ricean fading channels with maximum-ratio combining on the uplink. Unlike previous studies, our model accounts for the presence of unequal correlation matrices, unequal Rice factors, as well as unequal link gains to each terminal. The derived approximations lend themselves to useful insights, special cases and show the combined impact of line-of-sight (LoS) and correlated components. Numerical results show that while unequal correlation matrices enhance the system performance, the presence of strong LoS has an opposite effect. The approximations are general and remain insensitive to changes in the system dimensions, signal-to-noise-ratios, LoS levels, and correlation levels.",

keywords = "Unequal spatial correlation, Line-of-sight, Ricean fading, Maximum-ratio combining, Ergodic spectral efficiency, Massive MIMO, Statistical analysis",

author = "Harsh Tataria and Smith, {Peter J} and Greenstein, {Larry J.} and Dmochowski, {Pawel A} and Michail Matthaiou",

year = "2017",

month = oct,

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doi = "10.1109/LWC.2017.2726062",

language = "English",

volume = "6",

pages = "634--637",

journal = "IEEE Wireless Communications Letters",

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publisher = "IEEE - Institute of Electrical and Electronics Engineers Inc.",

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TY - JOUR

T1 - Impact of Line-of-Sight and Unequal Spatial Correlation on Uplink MU-MIMO Systems

AU - Tataria, Harsh

AU - Smith, Peter J

AU - Greenstein, Larry J.

AU - Dmochowski, Pawel A

AU - Matthaiou, Michail

PY - 2017/10/1

Y1 - 2017/10/1

N2 - Closed-form approximations of the expected per-terminal signal-to-interference-plus-noise-ratio (SINR) and ergodic sum spectral efficiency of a multiuser multiple-input multiple-output system are presented. Our analysis assumes spatially correlated Ricean fading channels with maximum-ratio combining on the uplink. Unlike previous studies, our model accounts for the presence of unequal correlation matrices, unequal Rice factors, as well as unequal link gains to each terminal. The derived approximations lend themselves to useful insights, special cases and show the combined impact of line-of-sight (LoS) and correlated components. Numerical results show that while unequal correlation matrices enhance the system performance, the presence of strong LoS has an opposite effect. The approximations are general and remain insensitive to changes in the system dimensions, signal-to-noise-ratios, LoS levels, and correlation levels.

AB - Closed-form approximations of the expected per-terminal signal-to-interference-plus-noise-ratio (SINR) and ergodic sum spectral efficiency of a multiuser multiple-input multiple-output system are presented. Our analysis assumes spatially correlated Ricean fading channels with maximum-ratio combining on the uplink. Unlike previous studies, our model accounts for the presence of unequal correlation matrices, unequal Rice factors, as well as unequal link gains to each terminal. The derived approximations lend themselves to useful insights, special cases and show the combined impact of line-of-sight (LoS) and correlated components. Numerical results show that while unequal correlation matrices enhance the system performance, the presence of strong LoS has an opposite effect. The approximations are general and remain insensitive to changes in the system dimensions, signal-to-noise-ratios, LoS levels, and correlation levels.

KW - Unequal spatial correlation

KW - Line-of-sight

KW - Ricean fading

KW - Maximum-ratio combining

KW - Ergodic spectral efficiency

KW - Massive MIMO

KW - Statistical analysis

U2 - 10.1109/LWC.2017.2726062

DO - 10.1109/LWC.2017.2726062

M3 - Article

SN - 2162-2345

VL - 6

SP - 634

EP - 637

JO - IEEE Wireless Communications Letters

JF - IEEE Wireless Communications Letters

IS - 5

M1 - 7976368

ER -

Impact of Line-of-Sight and Unequal Spatial Correlation on Uplink MU-MIMO Systems

Abstract

Subject classification (UKÄ)

Free keywords

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Cite this