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; Michalis 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 , Michalis Matthaiou

School of Electronics, Electrical Engineering and Computer Science

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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 demonstrate the aggregate impact of line-of-sight (LoS) and unequal correlation matrices. Numerical results show that while unequal correlation matrices enhance the expected SINR and ergodic sum spectral efficiency, the presence of strong LoS has an opposite effect. Our approximations are general and remain insensitive to changes in the system dimensions, signal-to-noise-ratios, LoS levels and unequal correlation levels.

Original language	English
Number of pages	4
Journal	IEEE Wireless Communications Letters
Volume	6
Issue number	99
DOIs	https://doi.org/10.1109/LWC.2017.2726062
Publication status	Published - 12 Jul 2017

Keywords

Ergodic sum spectral efficiency
Expected SINR
Line-of-sight
MU-MIMO
Unequal Correlation

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Impact of Line-of-Sight and Unequal Spatial Correlation on Uplink MU-MIMO Systems
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Tataria, H., Smith, P. J., Greenstein, L. J., Dmochowski , P. A., & Matthaiou, M. (2017). Impact of Line-of-Sight and Unequal Spatial Correlation on Uplink MU-MIMO Systems. IEEE Wireless Communications Letters, 6(99). https://doi.org/10.1109/LWC.2017.2726062

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AU - Tataria, Harsh

AU - Smith, Peter J.

AU - Greenstein, Larry J.

AU - Dmochowski , Pawel A.

AU - Matthaiou, Michalis

PY - 2017/7/12

Y1 - 2017/7/12

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 demonstrate the aggregate impact of line-of-sight (LoS) and unequal correlation matrices. Numerical results show that while unequal correlation matrices enhance the expected SINR and ergodic sum spectral efficiency, the presence of strong LoS has an opposite effect. Our approximations are general and remain insensitive to changes in the system dimensions, signal-to-noise-ratios, LoS levels and unequal 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 demonstrate the aggregate impact of line-of-sight (LoS) and unequal correlation matrices. Numerical results show that while unequal correlation matrices enhance the expected SINR and ergodic sum spectral efficiency, the presence of strong LoS has an opposite effect. Our approximations are general and remain insensitive to changes in the system dimensions, signal-to-noise-ratios, LoS levels and unequal correlation levels.

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KW - Expected SINR

KW - Line-of-sight

KW - MU-MIMO

KW - Unequal Correlation

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