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Design and Performance of Diversity based Wireless Interfaces for Sensor Network Nodes
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. (Mikrovågsteknik)
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The main focus of the work presented in this licentiate thesis concerns antenna design, adaptive antenna control and investigation on how the performance of small wireless nodes can be increased by inclusion of multiple antennas. In order to provide an end-user suitable solution for wireless nodes the devices require both small form factor and good performance in order to be competitive on the marked and thus the main part of this thesis focuses on techniques developed to achieve these goals. Two prototype systems have been developed where one has been used by National Defence Research Agency (FOI) to successfully monitor a test-subject moving in an outdoor terrain. The other prototype system shows the overall performance gain achievable in a wireless sensor node when multiple antennas and antenna beam steering is used. As an example of how to include multiple antennas in a wireless node the concept of using dual conformal patch antennas for wireless nodes is presented. The proposed antenna showed an excess of 10 dB gain when using a single driven antenna element as would be the case in a system utilizing antenna selection combining. When used as a 2-element phased array, up to 19 dB gain was obtained in a multiscattering environment. Using the second order resonance the proposed antenna structure achieves low mutual coupling and a reflection coefficient lower than -15 dB. The presented antenna design shows how a dual antenna wireless node can be designed using discrete phase control with passive matching which provides a good adaptive antenna solution usable for wireless sensor networks. The inclusion of discrete phase sweep diversity in a wireless node has been evaluated and shown to provide a significant diversity gain. The diversity gain of a discrete phase sweep diversity based system was measured in both a reverberation chamber and a real life office environment. The former environment showed between 5.5 to 10.3 dB diversity gain depending on the detector architecture and the latter showed a diversity gain ranging from 1 to 5.4 dB. Also the performance of nodes designed to be placed in a high temperature and multiscattering environment (the fan stage of a jet engine) has been evaluated. The work was carried out in order to verify that a wireless sensor network is able to operate in such a multiscattering environment. It was shown that the wireless nodes are able to operate in an emulated turbine environment based on real-life measured turbine fading data. The tested sensor network was able to transmit 32 byte packages using cyclic redundancy check at 2 Mbps at an engine speed of 13.000 rpm.

Place, publisher, year, edition, pages
Uppsala: Institutionen för teknikvetenskaper , 2013. , 96 p.
Keyword [en]
Wireless, Sensor, Network, WSN, Antenna, WISENET, Node, Diversity, Phased Array, Conformal, WBAN, Body Area
National Category
Communication Systems Embedded Systems Telecommunications
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
URN: urn:nbn:se:uu:diva-198734OAI: oai:DiVA.org:uu-198734DiVA: diva2:617582
Presentation
2013-05-20, Lägerhyddsvägen 1, Uppsala, 10:00 (English)
Opponent
Supervisors
Projects
WISENETWISEJET
Available from: 2013-04-29 Created: 2013-04-23 Last updated: 2013-05-13Bibliographically approved
List of papers
1. Conformal dual patch antenna for diversity based sensor nodes
Open this publication in new window or tab >>Conformal dual patch antenna for diversity based sensor nodes
2012 (English)In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 48, no 6, 306-307 p.Article in journal (Refereed) Published
Abstract [en]

A conformal antenna structure based on dual triangular patches is presented. The dual antennas are designed to be used in diversity based sensor node applications and are integrated in the enclosure of the node. The internal shielded enclosure houses the required electronics and power supply. Simulations and measurements show acceptable diversity performance and efficiency in the second resonance mode.

National Category
Engineering and Technology Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Microwave Technology; Engineering Science with specialization in Electronics
Identifiers
urn:nbn:se:uu:diva-172827 (URN)10.1049/el.2012.0088 (DOI)000301439000005 ()
Projects
WISENET
Funder
Vinnova, WISENET
Available from: 2012-04-17 Created: 2012-04-16 Last updated: 2017-12-07Bibliographically approved
2. Diversity Techniques for Robustness and Power Awareness in Wireless Sensor Systems for Railroad Transport Applications
Open this publication in new window or tab >>Diversity Techniques for Robustness and Power Awareness in Wireless Sensor Systems for Railroad Transport Applications
2011 (English)In: Sustainable Wireless Sensor Networks / [ed] Winston Seah and Yen Kheng Tan, InTech Open Publishers , 2011, 1, 75-95 p.Chapter in book (Refereed)
Place, publisher, year, edition, pages
InTech Open Publishers, 2011 Edition: 1
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-159204 (URN)978-953-307-297-5 (ISBN)
Projects
wisenet
Available from: 2011-09-25 Created: 2011-09-25 Last updated: 2016-04-20Bibliographically approved
3. Antenna diversity with opportunistic combining for ASk systems with single channel receivers
Open this publication in new window or tab >>Antenna diversity with opportunistic combining for ASk systems with single channel receivers
2010 (English)In: Proceedings of the Fourth European Conference on Antennas and Propagation (EuCAP), 2010, 1-5 p.Conference paper, Published paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-138838 (URN)
Conference
Fourth European Conference on Antennas and Propagation (EuCAP)
Projects
WISENET
Available from: 2010-12-20 Created: 2010-12-20 Last updated: 2016-04-18Bibliographically approved
4. Performance Evaluation of a Conformal Dual Patch Antenna in an Indoor Environment
Open this publication in new window or tab >>Performance Evaluation of a Conformal Dual Patch Antenna in an Indoor Environment
2013 (English)In: 7th European Conference on Antennas and Propagation (EuCAP), 2013, 439-442 p.Conference paper, Published paper (Refereed)
Abstract [en]

The performance of a conformal dual patch antenna design for wireless sensor networks were measured and evaluated in a real world multi-scattering environment. Both simulated and measured radiation patterns when using the antenna as a two element phased array were measured and corresponded well. The environment was measured and show strong fading characteristics. The measured data shows that the proposed structure gives a distinct advantage to the nodes communication compared to single element antennas while keeping the form factor suitable for integration of embedded hardware.

Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
Keyword
Antenna, Array, Reconfigurable, Conformal, Sensor, WSN, Indoor, Steerable, Performance
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
urn:nbn:se:uu:diva-198643 (URN)000327126000100 ()978-88-907018-3-2 (ISBN)
Conference
7th European Conference on Antennas and Propagation (EuCAP), APR 08-12, 2013, Gothenburg, SWEDEN
Projects
WISENET
Available from: 2013-04-22 Created: 2013-04-22 Last updated: 2015-03-09Bibliographically approved
5. Wireless sensor networks for aircraft engines
Open this publication in new window or tab >>Wireless sensor networks for aircraft engines
Show others...
2011 (English)Conference paper, Published paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Electronics
Identifiers
urn:nbn:se:uu:diva-138847 (URN)
Conference
Smart Systems Integration Conference, Dresden, Germany, 22-23.03.2011
Projects
wisenet
Available from: 2010-12-20 Created: 2010-12-20 Last updated: 2016-04-20Bibliographically approved
6. Wireless body area network (WBAN) monitoring application system (MASS) for personal monitoring
Open this publication in new window or tab >>Wireless body area network (WBAN) monitoring application system (MASS) for personal monitoring
Show others...
2009 (English)In: 6th edition of the International Workshop on Wearable Micro and Nano Technologies for Personalised Health (pHealth 2009), Oslo, Norge, 2009Conference paper, Published paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
urn:nbn:se:uu:diva-121065 (URN)
Conference
6th edition of the International Workshop on Wearable Micro and Nano Technologies for Personalised Health (pHealth 2009), Oslo, Norge
Projects
WISENET
Available from: 2010-03-18 Created: 2010-03-18 Last updated: 2016-04-14Bibliographically approved

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Citation style
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