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Design of Channel Measurement Guidelines for Characterization of Wireless Industrial Environments
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0001-9589-6986
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. Halmstad University.ORCID iD: 0000-0001-6497-4099
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
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2013 (English)Report (Other academic)
Abstract [en]

Providing reliable and timely communication in wireless industrial systems requires careful design of error control schemes able to tackle the bit error patterns typically occurring in these environments. As most error control schemes target some specific characteristics of a wireless channel, the selection of channel model is crucial for proper performance assessment. There are a number of widely used channel models, but the question of the most appropriate choice of model for industrial environments still remains largely open. Not many indoor measurement campaigns have focused on industrial environments with their own specific characteristics. In this paper we present a set of measurement guidelines aiming to characterize industrial environments such that suitable channel models can be selected to properly evaluate error control schemes targeting reliable and timely wireless communications in industrial environments. 

Place, publisher, year, edition, pages
Västerås, Sweden, 2013.
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:mdh:diva-20346ISRN: MDH-MRTC-280/2013-1-SEOAI: oai:DiVA.org:mdh-20346DiVA: diva2:638002
Available from: 2013-07-24 Created: 2013-07-24 Last updated: 2015-11-13Bibliographically approved
In thesis
1. Cooperative Communication for Increased Reliability in Industrial Wireless Networks
Open this publication in new window or tab >>Cooperative Communication for Increased Reliability in Industrial Wireless Networks
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Introducing wireless networks into distributed industrial systems may enable new or improved application areas and also great cost reductions due to lower complexity of installation and maintenance, compared to existing wired solutions. However, signals travelling through wireless channels are affected by pathloss, fading and shadowing, and, as a result, packet errors are both time-varying and more frequent than in e.g., existing wired fieldbuses. Packet errors or delays occurring in industrial systems can, in critical situations, lead to damage of expensive equipment or even danger to human life. Thus, wireless networks can be accepted for use in industrial networks only when sufficient levels of reliability and timeliness can be guaranteed.

Relaying is a technique that has the potential to increase reliability with maintained delay. Having different geographical locations, and thus different wireless channel qualities, some nodes may overhear transmitted packets even in cases when the intended receiver did not, and then cooperate by relaying these packets to their final destination.

This thesis deals with design of relaying strategies aiming to increase reliability in deadline-constrained industrial applications using wireless networks. The influence of several different parameters, such as positions of relay nodes, number of erroneous packets at the relay node and at the destination respectively, as well as the number of available time slots before the deadline, are evaluated to determine the best acting strategy for each relay node. Moreover, it is shown that when a specific relay node has the opportunity to aid more than one source node, performance can be improved even further if the relay node combines several packets, using Luby coding or packet aggregation, and instead relays such combined packets. Given the methods proposed in this thesis, the reliability in industrial wireless networks can be enhanced considerably, without increasing the delay, such that message deadlines still are kept.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2013
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 171
National Category
Communication Systems
Research subject
Computer Science
Identifiers
urn:nbn:se:mdh:diva-20960 (URN)978-91-7485-118-2 (ISBN)
Presentation
2013-10-04, Kappa, Mälardalens högskola, Västerås, 10:15 (English)
Opponent
Supervisors
Available from: 2013-08-20 Created: 2013-08-19 Last updated: 2013-12-03Bibliographically approved

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