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Impact of antenna design on MIMO performance for compact terminals with adaptive impedance matching

Vasilev, Ivaylo LU ; Plicanic, Vanja LU and Lau, Buon Kiong LU (2016) In IEEE Transactions on Antennas and Propagation 64(4). p.1454-1465
Abstract
Using the metrics of channel capacity and multiplexing efficiency, the adaptive impedance matching (AIM) performances of two multiple-input multiple-output (MIMO) terminals with different antenna designs were evaluated and compared. The evaluation was performed in LTE Band 18 Downlink (860-875 MHz) under realistic usage conditions of two measured user handgrips and simulated propagation channels with different angular spreads (ASs). The results provide potential performance gains from AIM based on realistic MIMO terminal prototypes, and the underlying mechanisms by which the gains were achieved, which can serve as antenna and AIM circuit design guidelines. In particular, the evaluation revealed that ideal uncoupled AIM networks can... (More)
Using the metrics of channel capacity and multiplexing efficiency, the adaptive impedance matching (AIM) performances of two multiple-input multiple-output (MIMO) terminals with different antenna designs were evaluated and compared. The evaluation was performed in LTE Band 18 Downlink (860-875 MHz) under realistic usage conditions of two measured user handgrips and simulated propagation channels with different angular spreads (ASs). The results provide potential performance gains from AIM based on realistic MIMO terminal prototypes, and the underlying mechanisms by which the gains were achieved, which can serve as antenna and AIM circuit design guidelines. In particular, the evaluation revealed that ideal uncoupled AIM networks can increase the capacity by up to 52% relative to 50 ohm terminations. However, the observed gains depend heavily on the antenna design, the user scenario and the channel’s angular spread. For example, the wideband design in different user cases experienced capacity gain of 4-9% from AIM in uniform 3D channels, in contrast to the 1.3-44% gain seen in a conventional narrowband design. In non-uniform channels with small ASs, the AIM gain for different mean incident angles depends on the absolute mean effective gain (MEG) and the change in correlation due to AIM; In cases where AIM has little impact on correlation, the mean incident angles with high AIM gains were close to those with high MEGs. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
MIMO systems, impedance matching, antenna measurements, handset antennas and multipath channels
in
IEEE Transactions on Antennas and Propagation
volume
64
issue
4
pages
12 pages
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • Scopus:84963971172
ISSN
0018-926X
DOI
10.1109/TAP.2016.2521885
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
618c3c4f-f480-40ae-b355-75ac60ace138 (old id 8519401)
date added to LUP
2016-01-13 11:14:05
date last changed
2016-11-13 04:26:09
@misc{618c3c4f-f480-40ae-b355-75ac60ace138,
  abstract     = {Using the metrics of channel capacity and multiplexing efficiency, the adaptive impedance matching (AIM) performances of two multiple-input multiple-output (MIMO) terminals with different antenna designs were evaluated and compared. The evaluation was performed in LTE Band 18 Downlink (860-875 MHz) under realistic usage conditions of two measured user handgrips and simulated propagation channels with different angular spreads (ASs). The results provide potential performance gains from AIM based on realistic MIMO terminal prototypes, and the underlying mechanisms by which the gains were achieved, which can serve as antenna and AIM circuit design guidelines. In particular, the evaluation revealed that ideal uncoupled AIM networks can increase the capacity by up to 52% relative to 50 ohm terminations. However, the observed gains depend heavily on the antenna design, the user scenario and the channel’s angular spread. For example, the wideband design in different user cases experienced capacity gain of 4-9% from AIM in uniform 3D channels, in contrast to the 1.3-44% gain seen in a conventional narrowband design. In non-uniform channels with small ASs, the AIM gain for different mean incident angles depends on the absolute mean effective gain (MEG) and the change in correlation due to AIM; In cases where AIM has little impact on correlation, the mean incident angles with high AIM gains were close to those with high MEGs.},
  author       = {Vasilev, Ivaylo and Plicanic, Vanja and Lau, Buon Kiong},
  issn         = {0018-926X},
  keyword      = {MIMO systems,impedance matching,antenna measurements,handset antennas and multipath channels},
  language     = {eng},
  number       = {4},
  pages        = {1454--1465},
  publisher    = {ARRAY(0xa934720)},
  series       = {IEEE Transactions on Antennas and Propagation},
  title        = {Impact of antenna design on MIMO performance for compact terminals with adaptive impedance matching},
  url          = {http://dx.doi.org/10.1109/TAP.2016.2521885 },
  volume       = {64},
  year         = {2016},
}