@inproceedings{7672,
  abstract     = {{Visible light communication (VLC) allows the dual use of lighting and wireless communication systems by
modulation of illumination devices. However, to increase the performance, typically, beam-forming measures are
taken creating pencil beams, thus contradicting the illumination purpose. In order to optimize the performance
trade o between ecient illumination and communication, the switching capabilities of illumination LEDs are
examined. Illumination LEDs with standard drivers and without beam-forming show limited applicability for
communication purposes as they are not optimized for the necessary switching capability (f  11 MHz) and
coherence. Methods to enhance the electrical current by pre-equalisation, biasing, carrier sweeping and current
shaping are examined in respect to the illumination LED's communication performance. A novel driver scheme
is derived which achieves considerably higher switching frequencies (f  100 MHz) without employing beamforming
at the illumination LED. This driver is able to obtain a data rate of up to 200 Mbit/s at a distance of
3.2 m, using on-o keying (OOK) modulation technique. Therefore, it is feasible to apply the LED driver by
implementing standardised illumination devices in VLC systems.}},
  author       = {{Schneider, Daniel and Shrotri, Abhijeet Narendra and Flatt, Holger and Stübbe, Oliver and Lachmayer, Roland}},
  booktitle    = {{Integrated Optics: Design, Devices, Systems and Applications VI}},
  editor       = {{Cheben, Pavel and Čtyroký, Jiří and Molina-Fernández, Iñigo}},
  isbn         = {{978-1-5106-4384-0}},
  issn         = {{1996-756X}},
  keywords     = {{Optical Wireless Communication, Visible Light Communication, VLC, Li-Fi, Illumination, Dual-purpose drivers}},
  location     = {{Online (Prag)}},
  publisher    = {{SPIE}},
  title        = {{{Efficient visible light communication drivers using illumination LEDs in industrial environments}}},
  doi          = {{10.1117/12.2588923}},
  volume       = {{11775}},
  year         = {{2021}},
}

@unpublished{2372,
  abstract     = {{Novel industrial wireless applications require wideband, real-time channel
characterization due to complex multipath propagation. Rapid machine motion
leads to fast time variance of the channel's reflective behavior, which must be
captured for radio channel characterization. Additionally, inhomogeneous radio
channels demand highly flexible measurements. Existing approaches for radio
channel measurements either lack flexibility or wide-band, real-time
performance with fast time variance. In this paper, we propose a correlative
channel sounding approach utilizing a software-defined architecture. The
approach enables real-time, wide-band measurements with fast time variance
immune to active interference. The desired performance is validated with a
demanding industrial application example.}},
  author       = {{Fliedner, Niels Hendrik and Block, Dimitri and Meier, Uwe}},
  booktitle    = {{arXiv:1805.01236}},
  keywords     = {{Correlation, Wireless communication, Real-time systems, Logic gates, Frequency measurement, Libraries, Time measurement}},
  pages        = {{6}},
  title        = {{{A Software-Defined Channel Sounder for Industrial Environments with Fast  Time Variance}}},
  year         = {{2018}},
}

@inproceedings{2374,
  abstract     = {{Novel industrial wireless applications require wideband, real-time channel characterization due to complex multipath propagation. Rapid machine motion leads to fast time variance of the channel's reflective behavior, which must be captured for radio channel characterization. Additionally, inhomogeneous radio channels demand highly flexible measurements. Existing approaches for radio channel measurements either lack flexibility or wide-band, real-time performance with fast time variance. In this paper, we propose a correlative channel sounding approach utilizing a software-defined architecture. The approach enables wide-band measurements with fast time variance immune to active interference. Furthermore, its real-time capability allows live processing on demand. The desired performance is validated with a demanding industrial application example.}},
  author       = {{Fliedner, Niels Hendrik and Block, Dimitri and Meier, Uwe}},
  booktitle    = {{2018 15th International Symposium on Wireless Communication Systems (ISWCS)}},
  isbn         = {{9781538650059}},
  keywords     = {{Correlation, Wireless communication, Real-time systems, Logic gates, Frequency measurement, Libraries, Time measurement}},
  location     = {{Lisbon, Portugal}},
  title        = {{{A Software-Defined Channel Sounder for Industrial Environments with Fast Time Variance}}},
  doi          = {{10.1109/iswcs.2018.8491207}},
  year         = {{2018}},
}

@misc{10169,
  abstract     = {{The reduction of wires and connections is a fundamental necessity for upcoming industrial 4.0 solutions, requiring a large amount of reconfigurability and flexibility. Our research focuses on recent ways of combining energy and data transmission in single contactless transducers, enabling easy installation, maintenance and possible fulfilment of high protection classes. While this approach can typically be solved by combining Wifi and inductive energy transfer, the Wifi aspect is often limited by the available media access and channel occupation. Another issue is the real time capability of Wifi or other wireless transmission protocols like IEEE 802.15.4. While creating a new wireless or contactless standard is beyond the focus of this work, we concentrate on combining existing technologies and their interoperability. This includes powerline communication systems, near field data transmission and inductive energy transfer mechanisms.}},
  author       = {{Wesemann, Derk and Witte, Stefan and Schmelter, Andreas and Heß, Roland}},
  booktitle    = {{Communication in automation : 2016 IEEE World Conference on Factory Communication Systems (WFCS)$dMay 3-6, 2016, Aveiro, Portugal}},
  isbn         = {{ 978-1-5090-2339-4 }},
  keywords     = {{Automation, Industry 4.0, Contactless Data Transmission, Contactless Energy Transmission, Wireless Communication}},
  location     = {{Aveiro, Portugal}},
  publisher    = {{IEEE}},
  title        = {{{Flexible factory automation: Potentials of contactless transmission systems, combining state-of-the-art technologies}}},
  doi          = {{10.1109/WFCS.2016.7496533}},
  year         = {{2016}},
}

@inproceedings{2375,
  abstract     = {{Industrial wireless communication in license-free spectrum bands such as the 2.4-GHz-ISM band suffer from motion and multipath effects, which cause a high time- and frequency-variant channel attenuation. Additionally, mutual interference from heterogeneous wireless technologies limits real-time capabilities of industrial wireless technologies. Therefore, performance validations of industrial wireless technologies within appropriate industrial wireless environments are necessary. In this paper, we present the first raw measurement data set publication of an industrial wireless environment characterization in a data repository for free public access to enable transparent industrial wireless technology validation and to enhance their comparability. We characterize the whole license-free 2.4-GHz-ISM band with a time resolution of 110 μs and a frequency resolution of 1MHz in a coexistence scenario with four antennas obstructed by robot arm movements. Additionally, the frequency and time variance of the measured channel attenuations are analyzed.}},
  author       = {{Block, Dimitri and Fliedner, Niels Hendrik and Toews, Daniel and Meier, Uwe}},
  booktitle    = {{2015 IEEE 20th Conference on Emerging Technologies & Factory Automation (ETFA)}},
  isbn         = {{9781467379298}},
  keywords     = {{Wireless communication, Wireless sensor networks, Antenna measurements, Attenuation measurement, Extraterrestrial measurements, Time-frequency analysis}},
  location     = {{ Luxembourg, Luxembourg}},
  title        = {{{Wireless channel measurement data sets for reproducible performance evaluation in industrial environments}}},
  doi          = {{10.1109/etfa.2015.7301599}},
  year         = {{2015}},
}