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Analytical Framework for Full Dimensional Massive MIMO with Ray-Based Channels

Miller, Chelsea L ; Smith, Peter J; Dmochowski, Pawel A; Tataria, Harsh LU and Matthaiou, Michail (2019) In IEEE Journal on Selected Topics in Signal Processing 13. p.1181-1195
Abstract
The performance of baseband beamforming in multi-user multiple-input multiple-output (MU-MIMO) systems has been extensively studied for simplified statistical channel models where no angular parameters are taken into account. In contrast, there is little performance analysis with ray-based models, which are more physically motivated, feature prominently in standardization and have been experimentally validated. Thus, unlike previous studies, we present a mathematical framework to analyze the performance of zero-forcing (ZF) and minimum-mean-squared-error (MMSE) combining. Using a central result for averaging in the angular domain, we derive tight approximations for the uplink signal-to-noise ratio and signal-to-interference-and-noise ratio... (More)
The performance of baseband beamforming in multi-user multiple-input multiple-output (MU-MIMO) systems has been extensively studied for simplified statistical channel models where no angular parameters are taken into account. In contrast, there is little performance analysis with ray-based models, which are more physically motivated, feature prominently in standardization and have been experimentally validated. Thus, unlike previous studies, we present a mathematical framework to analyze the performance of zero-forcing (ZF) and minimum-mean-squared-error (MMSE) combining. Using a central result for averaging in the angular domain, we derive tight approximations for the uplink signal-to-noise ratio and signal-to-interference-and-noise ratio (SINR) for ZF and MMSE processing, respectively, and the resulting spectral efficiencies. The remarkably simple expressions offer the following insights into the effects of the propagation environment. We demonstrate an increase in performance when moving from vertical uniform rectangular array (URA) to horizontal URA to uniform linear array (ULA) antenna configurations. There is also a corresponding increase in the robustness of the performance to propagation scenarios. We demonstrate that under specific conditions increasing the angular spread can decrease the SINR for a ULA - an unexpected behavior which we link to the effects of end-fire radiation. Furthermore, our results allow us to investigate the impact of different array configurations and system parameters on the rate of convergence to favorable propagation conditions. Finally, we evaluate the spatial correlation properties intrinsically present in ray-based models, and compare them to the commonly used simple exponential model which yields equal, fixed correlation characteristics for each user. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ergodic spectral efficiency, favorable propagation, linear processing, MU-MIMO, ray-based channel models
in
IEEE Journal on Selected Topics in Signal Processing
volume
13
pages
14 pages
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:85072601091
ISSN
1941-0484
DOI
10.1109/JSTSP.2019.2937635
language
English
LU publication?
yes
id
841b17ce-376f-4d88-b39c-630728efbfdd
date added to LUP
2019-08-05 11:21:50
date last changed
2019-10-13 05:05:39
@article{841b17ce-376f-4d88-b39c-630728efbfdd,
  abstract     = {The performance of baseband beamforming in multi-user multiple-input multiple-output (MU-MIMO) systems has been extensively studied for simplified statistical channel models where no angular parameters are taken into account. In contrast, there is little performance analysis with ray-based models, which are more physically motivated, feature prominently in standardization and have been experimentally validated. Thus, unlike previous studies, we present a mathematical framework to analyze the performance of zero-forcing (ZF) and minimum-mean-squared-error (MMSE) combining. Using a central result for averaging in the angular domain, we derive tight approximations for the uplink signal-to-noise ratio and signal-to-interference-and-noise ratio (SINR) for ZF and MMSE processing, respectively, and the resulting spectral efficiencies. The remarkably simple expressions offer the following insights into the effects of the propagation environment. We demonstrate an increase in performance when moving from vertical uniform rectangular array (URA) to horizontal URA to uniform linear array (ULA) antenna configurations. There is also a  corresponding increase in the robustness of the performance to propagation scenarios. We demonstrate that under specific conditions increasing the angular spread can decrease the SINR for a ULA - an unexpected behavior which we link to the effects of end-fire radiation. Furthermore, our results allow us to investigate the impact of different array configurations and system parameters on the rate of convergence to favorable propagation conditions. Finally, we evaluate the spatial correlation properties intrinsically present in ray-based models, and compare them to the commonly used simple exponential model which yields equal, fixed correlation characteristics for each user. },
  author       = {Miller, Chelsea L  and Smith, Peter J and Dmochowski, Pawel A and Tataria, Harsh and Matthaiou, Michail},
  issn         = {1941-0484},
  keyword      = {Ergodic spectral efficiency,favorable propagation,linear processing,MU-MIMO,ray-based channel models},
  language     = {eng},
  month        = {08},
  pages        = {1181--1195},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Journal on Selected Topics in Signal Processing},
  title        = {Analytical Framework for Full Dimensional Massive MIMO with Ray-Based Channels},
  url          = {http://dx.doi.org/10.1109/JSTSP.2019.2937635},
  volume       = {13},
  year         = {2019},
}