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Impact of Array Configuration on Head-Mounted Display Performance at mm Wave Bands

Marinsek, Alexander ; Cai, Xuesong LU ; De Strycker, Lieven ; Tufvesson, Fredrik LU orcid and Van Der Perre, Liesbet LU (2023) 2023 Joint European Conference on Networks and Communications and 6G Summit, EuCNC/6G Summit 2023 p.192-197
Abstract

Immersing a user in life-like extended reality (XR) scenery using a head-mounted display (HMD) with a constrained form factor and hardware complexity requires remote rendering on a nearby edge server or computer. Millimeter-wave (mmWave) communication technology can provide sufficient data rate for wireless XR content transmission. However, mmWave channels exhibit severe sparsity in the angular domain. This means that distributed antenna arrays are required to cover a larger angular area and to combat outage during HMD rotation. At the same time, one would prefer fewer antenna elements/arrays for a lower complexity system. Therefore, it is important to evaluate the trade-off between the number of antenna arrays and the achievable... (More)

Immersing a user in life-like extended reality (XR) scenery using a head-mounted display (HMD) with a constrained form factor and hardware complexity requires remote rendering on a nearby edge server or computer. Millimeter-wave (mmWave) communication technology can provide sufficient data rate for wireless XR content transmission. However, mmWave channels exhibit severe sparsity in the angular domain. This means that distributed antenna arrays are required to cover a larger angular area and to combat outage during HMD rotation. At the same time, one would prefer fewer antenna elements/arrays for a lower complexity system. Therefore, it is important to evaluate the trade-off between the number of antenna arrays and the achievable performance to find a proper practical solution. This work presents indoor 28 GHz mmWave channel measurement data, collected during HMD mobility, and studies the dominant eigenmode (DE) gain. DE gain is a significant factor in under-standing system performance since mm Wave channel sparsity and eigenmode imbalance often results in provisioning the majority of the available power to the DE. Moreover, it provides the upper performance bounds for widely-adopted analog beamformers. We propose 3 performance metrics - gain trade-off, gain volatility, and minimum service trade-off - for evaluating the performance of a multi-array HMD and apply the metrics to indoor 28 GHz channel measurement data. Evaluation results indicate, that 3 arrays provide stable temporal channel gain. Adding a 4th array further increases channel capacity, while any additional arrays do not significantly increase physical layer performance.

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Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
antenna configuration, channel measurements, Extended reality, millimeter-wave, wireless
host publication
2023 Joint European Conference on Networks and Communications and 6G Summit, EuCNC/6G Summit 2023
pages
6 pages
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
conference name
2023 Joint European Conference on Networks and Communications and 6G Summit, EuCNC/6G Summit 2023
conference location
Gothenburg, Sweden
conference dates
2023-06-06 - 2023-06-09
external identifiers
  • scopus:85168407882
ISBN
9798350311020
DOI
10.1109/EuCNC/6GSummit58263.2023.10188332
language
English
LU publication?
yes
id
2bbaf573-813b-4869-9f10-09e2d3d15d38
date added to LUP
2023-11-13 14:45:50
date last changed
2023-11-21 10:02:45
@inproceedings{2bbaf573-813b-4869-9f10-09e2d3d15d38,
  abstract     = {{<p>Immersing a user in life-like extended reality (XR) scenery using a head-mounted display (HMD) with a constrained form factor and hardware complexity requires remote rendering on a nearby edge server or computer. Millimeter-wave (mmWave) communication technology can provide sufficient data rate for wireless XR content transmission. However, mmWave channels exhibit severe sparsity in the angular domain. This means that distributed antenna arrays are required to cover a larger angular area and to combat outage during HMD rotation. At the same time, one would prefer fewer antenna elements/arrays for a lower complexity system. Therefore, it is important to evaluate the trade-off between the number of antenna arrays and the achievable performance to find a proper practical solution. This work presents indoor 28 GHz mmWave channel measurement data, collected during HMD mobility, and studies the dominant eigenmode (DE) gain. DE gain is a significant factor in under-standing system performance since mm Wave channel sparsity and eigenmode imbalance often results in provisioning the majority of the available power to the DE. Moreover, it provides the upper performance bounds for widely-adopted analog beamformers. We propose 3 performance metrics - gain trade-off, gain volatility, and minimum service trade-off - for evaluating the performance of a multi-array HMD and apply the metrics to indoor 28 GHz channel measurement data. Evaluation results indicate, that 3 arrays provide stable temporal channel gain. Adding a 4th array further increases channel capacity, while any additional arrays do not significantly increase physical layer performance.</p>}},
  author       = {{Marinsek, Alexander and Cai, Xuesong and De Strycker, Lieven and Tufvesson, Fredrik and Van Der Perre, Liesbet}},
  booktitle    = {{2023 Joint European Conference on Networks and Communications and 6G Summit, EuCNC/6G Summit 2023}},
  isbn         = {{9798350311020}},
  keywords     = {{antenna configuration; channel measurements; Extended reality; millimeter-wave; wireless}},
  language     = {{eng}},
  pages        = {{192--197}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  title        = {{Impact of Array Configuration on Head-Mounted Display Performance at mm Wave Bands}},
  url          = {{http://dx.doi.org/10.1109/EuCNC/6GSummit58263.2023.10188332}},
  doi          = {{10.1109/EuCNC/6GSummit58263.2023.10188332}},
  year         = {{2023}},
}