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Impact of Spatial Consistency on Dynamic Beamforming for Millimeter-Wave Cellular Systems

Tataria, Harsh LU and Tufvesson, Fredrik LU (2019) 9th MC and Technical Meeting of COST IRACON
Abstract
Millimeter-wave (mmWave) frequencies are set to play an important role in fifth-generation (5G) wireless systems. A pre-requisite for the design and performance assessment of 5G wireless is the understanding of the involved propagation processes and derivation of insightful channel models. Unlike bands below 6 GHz, several additional modelling features need to be catered for at mmWaves. For dynamic scenarios, spatial consistency (SC) is a novel mandatory feature of 5G channel models ensuring continuity in the channel parameters as the user equipment (UE) moves along a trajectory. Such mobility has an enormous impact on the performance of common beamforming techniques leveraged to deliver high spectral efficiencies. Unlike others, this... (More)
Millimeter-wave (mmWave) frequencies are set to play an important role in fifth-generation (5G) wireless systems. A pre-requisite for the design and performance assessment of 5G wireless is the understanding of the involved propagation processes and derivation of insightful channel models. Unlike bands below 6 GHz, several additional modelling features need to be catered for at mmWaves. For dynamic scenarios, spatial consistency (SC) is a novel mandatory feature of 5G channel models ensuring continuity in the channel parameters as the user equipment (UE) moves along a trajectory. Such mobility has an enormous impact on the performance of common beamforming techniques leveraged to deliver high spectral efficiencies. Unlike others, this paper aims to quantify the impact of SC on dynamic mmWave beamforming performance. We focus on the downlink of a 28 GHz urban microcellular scenario, where the base station comprises of a 16x16 cross-polarized uniform planar array (UPA) serving multiple 4x4 UPA UEs. Using the standardized Third Generation Partnership Project 38.901 SC-I procedure, we evaluate the signal-to-interference-plus-noise ratio of a UE and the system ergodic sum spectral efficiency with zero-forcing, block diagonalization, and signal-to-leakage-plus-noise ratio beamforming. With each technique, our results show that at practical signal-to-noise-ratio levels, spatially consistent channels yield a significant performance loss relative to the case without SC due to substantial spatial correlation across the channel parameters. We demonstrate the validity of this conclusion with multiple UE trajectories. The results serve as a guideline to recalibrate our expectations from dynamic beamforming. (Less)
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author
organization
publishing date
type
Contribution to conference
publication status
in press
subject
keywords
Millimeter-wave systems, Dynamic propagation channels, Baseband beamforming control, Spatial consistency, 3GPP compliance
pages
9 pages
conference name
9th MC and Technical Meeting of COST IRACON
conference location
Dublin, Ireland
conference dates
2019-01-16 - 2019-01-18
language
English
LU publication?
yes
id
3b11ba59-7700-4b42-a163-c1cd09dbca1f
date added to LUP
2019-01-11 09:35:36
date last changed
2019-01-14 08:15:57
@misc{3b11ba59-7700-4b42-a163-c1cd09dbca1f,
  abstract     = {Millimeter-wave (mmWave) frequencies are set to play an important role in fifth-generation (5G) wireless systems. A pre-requisite for the design and performance assessment of 5G wireless is the understanding of the involved propagation processes and derivation of insightful channel models. Unlike bands below 6 GHz, several additional modelling features need to be catered for at mmWaves. For dynamic scenarios, spatial consistency (SC) is a novel mandatory feature of 5G channel models ensuring continuity in the channel parameters as the user equipment (UE) moves along a trajectory. Such mobility has an enormous impact on the performance of common beamforming techniques leveraged to deliver high spectral efficiencies. Unlike others, this paper aims to quantify the impact of SC on dynamic mmWave beamforming performance. We focus on the downlink of a 28 GHz urban microcellular scenario, where the base station comprises of a 16x16 cross-polarized uniform planar array (UPA) serving multiple 4x4 UPA UEs. Using the standardized Third Generation Partnership Project 38.901 SC-I procedure, we evaluate the signal-to-interference-plus-noise ratio of a UE and the system ergodic sum spectral efficiency with zero-forcing, block diagonalization, and signal-to-leakage-plus-noise ratio beamforming. With each technique, our results show that at practical signal-to-noise-ratio levels, spatially consistent channels yield a significant performance loss relative to the case without SC due to substantial spatial correlation across the channel parameters. We demonstrate the validity of this conclusion with multiple UE trajectories. The results serve as a guideline to recalibrate our expectations from dynamic beamforming.},
  author       = {Tataria, Harsh and Tufvesson, Fredrik},
  keyword      = {Millimeter-wave systems,Dynamic propagation channels,Baseband beamforming control,Spatial consistency,3GPP compliance},
  language     = {eng},
  location     = {Dublin, Ireland},
  month        = {01},
  pages        = {9},
  title        = {Impact of Spatial Consistency on Dynamic Beamforming for Millimeter-Wave Cellular Systems},
  year         = {2019},
}