Now showing 1 - 3 of 3
  • Publication
    Metadata only
    Sensing Reverberation Chamber Loading for IO-Link Wireless Testing
    (IEEE, 2021-08) ;
    Krush, Dmytro
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    ;
    Reverberation chambers (RCs) can be used as repeatable and shielded test environments for electromagnetic compatibility testing and performance evaluation of wireless com-munication devices, as they inherently emulate a Rician/Rayleigh fading environment. Loading a RC with radio frequency (RF) absorbing material leads to an increasing coherence bandwidth (CBW) of the radio channel within the RC, where the appropriate value can be tailored to specific test specifications. In this paper the CBW is directly measured by the wireless system under test. Measurements were carried out with different loadings and the link quality indication (LQI) was used to determine an appropriate RC loading.
  • Publication
    Metadata only
    Coexistence Management Methods and Tools for IO-Link Wireless
    Wireless communication systems are enabler technologies for modern and flexible production concepts, essentially within the Industry 4.0 directive. For reliable low-latency wireless communication, the availability of frequency spectrum is a general prerequisite. IO-Link Wireless (IOLW) is a vendor-independent wireless communication standard, which operates in the 2.4 GHz ISM (Industrial, Scientific, Medical) band and especially addresses the requirements of industrial discrete manufacturing processes. The 2.4 GHz ISM band is used by various other radio systems, making coexistence management a fundamental challenge. Blacklisting and frequency hopping schemes are specified to increase the IOLWcoexistence behavior. In this paper coexistence management methods and tools, which can be employed for IOLW are presented. These tools can be used to enhance the coexistence behavior and thus the reliability, and at the same time, reduce energy consumption. After an introduction and a detailed presentation of IOLW, a software tool is presented that allows to implement an intelligent frequency management by adapting blacklists to the respective coexistence and boundary conditions. This is based on generic measurements, which are also shown in this paper. Finally, a conclusion and an outlook for further integration into an overall system are given.
  • Publication
    Metadata only
    Standardisierung eines schnellen drahtlosen Sensor/Aktor-Netzwerkes für die Fertigungsautomatisierung
    Wireless Technologies (Wireless communication) have been well-established, even in industrial applications, in the past few years. Compared to common office applications, the requirements in terms of robustness, coexistence, reliability and latency are considerably higher. Different automation solutions can be assigned to the industry sectors logistics/transportation, infrastructure, building automation, production automation and process automation, according to DIN/VDE 2185. The specific challenges on the sensor/actuator communication in the production automation will be presented in this paper. A solution is introduced, which was developed in cooperation with industrial partners from the Profibus (PI) Group and which is in the final state of the standardization process.