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Statistical Characterization of the Electromagnetic Environment in a Hospital
KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth. (Communication Systems)
Center for RF Measurement Technology, University of Gävle, Gävle, Sweden. (Högskolan i Gävle, Akademin för teknik och miljö)
Center for RF Measurement Technology, University of Gävle, Gävle, Sweden. (Högskolan i Gävle, Akademin för teknik och miljö)
Center for RF Measurement Technology, University of Gävle, Gävle, Sweden. (Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för elektronik, matematik och naturvetenskap)
2010 (English)In: 2010 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC), 2010, 289-292 p.Conference paper, Published paper (Refereed)
Abstract [en]

Thanks to advances in digital technology many hospitals are becoming populated with wireless medical applications to control life critical functions. Electromagnetic interference can cause severe performance degradations on these wireless applications. Several accidents have been reported which calls for a more thorough characterization of these interferences in areas where critical wireless applications are used. In this paper the results of electromagnetic interference measurements performed in a hospital are presented. The amplitude probability distribution (APD) and the inter arrival pulse probability distribution (PSD) are used to characterize these environments. In addition, Middleton parameters can be calculated from the measured data. This study is considered to be a first effort to characterize the 20 MHz -2500 MHz band in hospitals.

Place, publisher, year, edition, pages
2010. 289-292 p.
Keyword [en]
Critical functions, Digital technologies, Electromagnetic environments, Electromagnetic interference, Electromagnetic interference measurement, Measured data, Performance degradation, Statistical characterization, Wireless application, Electromagnetic compatibility, Electromagnetic pulse, Electromagnetic wave interference, Electromagnetism, Hospitals, Magnetic materials, Medical applications, Probability density function, Signal interference
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-48293DOI: 10.1109/APEMC.2010.5475847Scopus ID: 2-s2.0-77955010393ISBN: 978-1-4244-5621-5 (print)OAI: oai:DiVA.org:kth-48293DiVA: diva2:457240
Conference
2010 Asia-Pacific Symposium on Electromagnetic Compatibility, APEMC 2010; Beijing; 12 April 2010 through 16 April 2010
Note
QC 20111121Available from: 2011-11-17 Created: 2011-11-17 Last updated: 2012-01-19Bibliographically approved
In thesis
1. RF Channel Characterization in Industrial, Hospital and Home Environments
Open this publication in new window or tab >>RF Channel Characterization in Industrial, Hospital and Home Environments
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The rapid development of electronic components has resulted in the emergence of newmobile applications targeted at industry and hospital sectors. Moreover, a lack of availablewireless frequencies as result of the growth of wireless systems is becoming a problem.In this thesis we characterize industrial and hospital environments in order to provide theknowledge necessary to asses present and future development of critical wireless applications.Furthermore, we investigate the possibility of using TV white space by analysingthe interference from secondary to primary user in home environments.

Some of the wireless solutions used in industries and hospitals come directly fromsystems designed for home or office, such asWLAN and Bluetooth. These systems are notprepared to handle problems associated with interference of impulsive character found inindustrial processes and electrical systems.

Typically, industrial environments have been classified as reflective environments dueto the metallic structure present in the buildings. In this thesis, we demonstrate that althoughthis may be generally true, some locations in the industry may have special propertieswith wave propagation characteristics in the opposite direction. Stored materials canabsorb wireless signals, resulting in a coverage problem. From the measurement campaignwe are able to distinguish three main classes of indoor environments (highly reflective,medium reflective and low reflective) with different propagation characteristics.

Improving spectrum efficiency can be a solution to the growing demand for wirelessservices and can increase a system’s robustness against interference, particularly in criticalapplications in industrial and hospital environments. One improvement in spectrum efficiencycan be for secondary consumers to reuse unassigned portions of the TV spectrum ata specific time and geographical location. This thesis studies the effect of inserting whitespace devices in the TV broadcast spectrum. Note that any new model must state the maximumpower allocated to secondary users to avoid harmful interference with the primarysignal.

The content of this thesis is divided into three parts. The first part is the most comprehensiveand addresses electromagnetic interference and multipath characterization ofindustrial environments. In this part, we have developed a method for channel characterizationfor complex electromagnetic environments and have produced results from differentindustrial environments. The second part presents a preliminary study that characterizesthe electromagnetic interference in a hospital environment. The third part is a study ofsecondary users reusing the TV white spaces.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. xiii, 65 p.
Series
Trita-ICT-COS, ISSN 1653-6347 ; 1203
National Category
Telecommunications
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-61343 (URN)
Presentation
2012-02-14, 99131, Kungsbäckvägen 47, Gävle, 13:15 (English)
Opponent
Supervisors
Note
QC 20120119Available from: 2012-01-19 Created: 2012-01-17 Last updated: 2012-01-20Bibliographically approved

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