Measured adaptive matching performance of a MIMO terminal with user effects
Author
Summary, in English
Absorption and impedance mismatch due to the proximity of a user as well as certain propagation channel characteristics can severely degrade the multiple-input multiple-output (MIMO) performance of multi-antenna terminals in real usage scenarios. In this context, we investigated the potential of adaptive impedance matching (AIM) to mitigate performance degradation from these effects based on channel measurements involving a terminal prototype in three user scenarios and two propagation environments. First, optimal AIM state for the terminal in a given user-channel setup was found by post-processing the measured channels. The optimal state was then experimentally verified with two Maury Microwave mechanical tuners. The results show that by employing AIM instead of 50Ω termination, the average capacity is increased by up to 25%. Moreover, the observed capacity gains can be partly explained by physical mechanisms underlying the propagation conditions. Furthermore, the achieved gains with real tuners are only marginally affected by the tuners’ actual insertion losses, estimated to be 0.1-0.7 dB. Therefore, we conclude that AIM can be a viable solution to enhance MIMO terminal performance.
Department/s
Publishing year
2013
Language
English
Pages
1720-1723
Publication/Series
IEEE Antennas and Wireless Propagation Letters
Volume
12
Full text
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Links
Document type
Journal article (letter)
Publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
Topic
- Electrical Engineering, Electronic Engineering, Information Engineering
Status
Published
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
Research group
- Radio Systems
- Electromagnetic theory
ISBN/ISSN/Other
- ISSN: 1548-5757