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On user effect compensation of MIMO terminals with adaptive impedance matching

Vasilev, Ivaylo LU ; Plicanic, Vanja LU and Lau, Buon Kiong LU (2013) IEEE International Symposium on Antennas and Propagation, 2013 p.174-175
Abstract
Proximity of user has been established as a major cause of performance degradation in multiple-input multiple-output (MIMO) terminals. Here, we investigate the potential of adaptive impedance matching (AIM) to improve the performance of two MIMO terminals in a free space (FS) and a two-hand (TH) user scenario, assuming uniform 3D angular power spectrum for the incoming signal. The results show that lossless uncoupled AIM circuits can enhance the MIMO capacity of the terminals by up to 43% relative to standard 50 ohm terminations. In particular, the largest capacity gain is obtained in the terminal with good matching but narrower antenna bandwidth and worse isolation performance, for the TH scenario. On the other hand, the terminal with... (More)
Proximity of user has been established as a major cause of performance degradation in multiple-input multiple-output (MIMO) terminals. Here, we investigate the potential of adaptive impedance matching (AIM) to improve the performance of two MIMO terminals in a free space (FS) and a two-hand (TH) user scenario, assuming uniform 3D angular power spectrum for the incoming signal. The results show that lossless uncoupled AIM circuits can enhance the MIMO capacity of the terminals by up to 43% relative to standard 50 ohm terminations. In particular, the largest capacity gain is obtained in the terminal with good matching but narrower antenna bandwidth and worse isolation performance, for the TH scenario. On the other hand, the terminal with poorer matching but higher isolation and significantly larger bandwidth has lower average capacity in FS. However, it is more robust to user proximity, and hence it achieves only 8% capacity gain with AIM in the TH scenario. Therefore, antenna design parameters can significantly influence potential benefits of AIM in practice. (Less)
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author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
IEEE International Symposium on Antennas and Propagation, 2013
pages
2 pages
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
conference name
IEEE International Symposium on Antennas and Propagation, 2013
conference location
Lake Buena Vista, FL, United States
conference dates
2013-07-07 - 2013-07-13
external identifiers
  • wos:000332766800087
  • scopus:84894222103
ISSN
1947-1491
1522-3965
DOI
10.1109/APS.2013.6710748
project
EIT_ANTCHN Antenna-Channel Harmonization for Throughput Enhancement in Advanced Mobile Terminals
EIT_Optantsys Novel Antenna System Design Paradigm for High Performance Mobile Communications
language
English
LU publication?
yes
id
ea3fc09a-e727-4d57-b298-bbe3e5ea041b (old id 3562470)
date added to LUP
2016-04-01 11:14:26
date last changed
2024-04-08 03:59:47
@inproceedings{ea3fc09a-e727-4d57-b298-bbe3e5ea041b,
  abstract     = {{Proximity of user has been established as a major cause of performance degradation in multiple-input multiple-output (MIMO) terminals. Here, we investigate the potential of adaptive impedance matching (AIM) to improve the performance of two MIMO terminals in a free space (FS) and a two-hand (TH) user scenario, assuming uniform 3D angular power spectrum for the incoming signal. The results show that lossless uncoupled AIM circuits can enhance the MIMO capacity of the terminals by up to 43% relative to standard 50 ohm terminations. In particular, the largest capacity gain is obtained in the terminal with good matching but narrower antenna bandwidth and worse isolation performance, for the TH scenario. On the other hand, the terminal with poorer matching but higher isolation and significantly larger bandwidth has lower average capacity in FS. However, it is more robust to user proximity, and hence it achieves only 8% capacity gain with AIM in the TH scenario. Therefore, antenna design parameters can significantly influence potential benefits of AIM in practice.}},
  author       = {{Vasilev, Ivaylo and Plicanic, Vanja and Lau, Buon Kiong}},
  booktitle    = {{IEEE International Symposium on Antennas and Propagation, 2013}},
  issn         = {{1947-1491}},
  language     = {{eng}},
  pages        = {{174--175}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  title        = {{On user effect compensation of MIMO terminals with adaptive impedance matching}},
  url          = {{https://lup.lub.lu.se/search/files/42855823/vasilev_aps2013.pdf}},
  doi          = {{10.1109/APS.2013.6710748}},
  year         = {{2013}},
}