Now showing 1 - 10 of 14
  • Publication
    Metadata only
    Reproducibility of Fading Propability in a Reverberation Chamber for Wireless Device Testing
    (IEEE, 2019-09) ;
    Krush, Dmytro
    ;
    ;
    Reverberation chambers (RCs) are a feasible option as test environment for evaluation of wireless devices with integrated antenna, as they inherently emulate a Rayleigh fading channel. In this paper, the dependency of fading on the frequency and position/orientation of an equipment under test (EUT) antenna is evaluated in a RC and for different numbers of RC steps. The measured data were applied to an exemplary standard for wireless communication. The results suggest that the empirical probability of fading is repeatable and independent of frequency or position/orientation of the EUT.
  • Publication
    Metadata only
    P2.13 Korrelation von wiederholten Messungen in einer Modenverwirbelungskammer
    Modenverwirbelungskammern (MVKn) stellen vielfältig verwendbare, reproduzierbare Messumgebungen dar. Grundsätzlich handelt es sich dabei um elektromagnetisch geschirmte Volumina, in denen sog. Modenrührer eingebracht sind, die ein elektromagnetisches Feld „verwirbeln“, sodass ein Prüfling einer definierten aber statistisch variierenden Umgebung ausgesetzt wird. Die Modenrührer in MVKn können schrittweise zwischen den einzelnen Messzeitpunkten oder kontinuierlich verfahren werden. In diesem Beitrag werden die jeweiligen Eigenschaften von wiederholten Messungen, die sowohl bei kontinuierlichem als auch schrittweisem Betrieb der Modenrührer aufgenommen wurden, betrachtet. Mit Hilfe von Korrelationskoeffizenten wird jeweils die Wiederholbarkeit der aufgenommenen Messwertsequenzen insgesamt untersucht. Darüber hinaus wird die Wiederholbarkeit von Fadingeinbrüchen gesondert betrachtet, da diese einen wesentlichen Einfluss auf Funksysteme haben, die mittels einer MVK charakterisiert werden können. Als Ursache für Abweichungen bei Wiederholungen wird abschließend das zeitliche Verhalten bzw. die Streuungen zwischen den Messzeitpunkten betrachtet.
  • Publication
    Metadata only
    Base Station Antenna Placement of Wireless Sensor/Actuator Networks in Manufacturing Cells
    (2019) ;
    Krush, Dmytro
    ;
    Wattar, Housam
    ;
    ;
    Wireless technologies are intensively used in industrial environments and wireless sensor/actuator networks play a key role for highly flexible automation plants, especially within the Industry 4.0 initiative. In order to achieve a highly robust system behavior also an attentive antenna selection and placement within a manufacturing cell is of interest resulting in an enhanced system reserve. In this paper different strategies for base station antenna placement are investigated with the focus on star-topologies, i.e. a central base station and a multitude of remotely located wireless sensors and actuators. A probabilistic approach has been chosen for modeling path loss, multipath fading and coexistence behavior with respect to adjoining manufacturing cells. Also cable attenuation for remote antennas connected to the base station are taken into account.
  • Publication
    Metadata only
    Test method for narrowband F/TDMA-based wireless sensor/actuator networks including radio channel emulation in severe multipath environments
    (2018-03-23) ;
    Krush, Dmytro
    ;
    ;
    A test method for narrowband wireless sensor/actuator networks is presented, facilitating affordable and efficient performance and compliance tests prior to the deployment of the wireless communication systems. Commonly used channel models are examined to derive a worst-case test scenario. Employing frequency/time division multiple access (F/TDMA) techniques and protocol synchronization, a new and efficient test method is suggested, where the equipment under test (EUT) is evaluated under the worst-case scenario. A cost-efficient channel emulator is introduced to emulate fading in multipath environments. Also, industrial interferes can be included in the setup. Furthermore, a procedure to test wireless devices with integrated, non-detachable antennas is presented.
  • Publication
    Metadata only
    IO-Link Wireless enhanced factory automation communication for Industry 4.0 applications
    (Copernicus, 2018-03-06) ;
    Krush, Dmytro
    ;
    ; ;
    Kaercher, Bernd
    ;
    Ritter, Jochen
    ;
    Gaggero, Pascal
    ;
    Rentschler, Markus
    In the context of the Industry 4.0 initiative, Cyber-Physical Production Systems (CPPS) or Cyber Manufacturing Systems (CMS) can be characterized as advanced networked mechatronic production systems gaining their added value by interaction with the ambient Industrial Internet of Things (IIoT). In this context appropriate communication technologies and standards play a vital role to realize the manifold potential improvements in the production process. One of these standards is IO-Link. In 2016 more than 5 million IO-Link nodes have been produced and delivered, still gaining increasing acceptance for the communication between sensors, actuators and the control level. The steadily increasing demand for more flexibility in automation solutions can be fulfilled using wireless technologies. With the wireless extension for the IO-Link standard, which will be presented in this article, maximum cycle times of 5 ms can be achieved with a probability that this limit will be exceeded to be at maximum one part per billion. Also roaming capabilities, wireless coexistence mechanisms and the possibility to include battery-powered or energy-harvesting sensors with very limited energy resources in the realtime network were defined. For system planning, setup, operation and maintenance, the standard engineering tools of IO-Link can be employed so that the backward compatibility with wired IO-Link solutions can be guaranteed. Interoperability between manufacturers is a key requirement for any communication standard, thus a procedure for IO-Link Wireless testing is also suggested.
  • Publication
    Metadata only
    A wireless communication system for energy and environmental monitoring
    (2017-01-10)
    Krush, Dmytro
    ;
    ; ; ;
    Kaercher, Bernd
    Custom-fit communication systems are key elements in modern cyber-physical sensor systems. Therefore a wireless communication system (WCS) for sensor/actuator communication has been developed to facilitate energy and environmental monitoring on the shop floor of industrial production sites. Initially, the distinct demands and requirements are described. As the WCS has been designed for new installations as well as for retrofitting already installed facilities, the WCS has to be able to coexist with other wireless communication systems already allocated in the same frequency band. The WCS handles measurement data from both, energy-autarkic sensors and fast line-powered sensors. Mobile users in the field equipped with mobile devices are served by the system, too. A modular hardware concept has been chosen for easy system modification or for the integration of new wireless standards. Finally, measured results for the coexistence capability are presented.