Peter Hellwig
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View article: Characterization of keyhole dynamics in laser welding of copper by means of high-speed synchrotron X-ray imaging
Characterization of keyhole dynamics in laser welding of copper by means of high-speed synchrotron X-ray imaging Open
International audience
View article: LIDAR-Assisted Channel Modelling for LiFi in Realistic Indoor Scenarios
LIDAR-Assisted Channel Modelling for LiFi in Realistic Indoor Scenarios Open
We present a new, accurate, low complexity channel modelling methodology for LiFi in realistic indoor scenarios. A LIDAR scanner is used to capture the 3D environment in which the LiFi system is to be deployed. Next, the generated 3D point…
View article: All-Optical Distributed MIMO for LiFi: Spatial Diversity Versus Spatial Multiplexing
All-Optical Distributed MIMO for LiFi: Spatial Diversity Versus Spatial Multiplexing Open
LiFi or networked optical wireless communication is likely to play an important role in offloading mobile data traffic from radio into the optical spectrum. As the number of Internet of Things (IoT) devices is growing, the RF spectrum beco…
View article: An Efficient Multi-Link Channel Model for LiFi
An Efficient Multi-Link Channel Model for LiFi Open
In this paper, we report for the first time on a new channel modelling technique for multi-link LiFi scenarios. By considering simplified numerical calculation, it models the links between multiple optical frontends and multiple mobile dev…
View article: Distributed Multiuser MIMO for LiFi: Experiments in an Operating Room
Distributed Multiuser MIMO for LiFi: Experiments in an Operating Room Open
Networked optical wireless communication, also denoted as LiFi, is expected to play an important role in so-called smart hospitals. In this paper, we present the first experimental study of LiFi in an operating room at Motol University Hos…
View article: Distributed MIMO for Li-Fi: Channel Measurements, Ray Tracing and Throughput Analysis
Distributed MIMO for Li-Fi: Channel Measurements, Ray Tracing and Throughput Analysis Open
LiFi has been considered as a promising candidate for future wireless indoor networks. The IEEE P802.15.13 and P802.11bb standardization groups agreed upon channel models generated using the non-sequential ray tracing approach of OpticStud…
View article: All-Indoor Optical Customer Premises Equipment for Fixed Wireless Access
All-Indoor Optical Customer Premises Equipment for Fixed Wireless Access Open
We demonstrate an LED-based optical wireless link for fixed wireless access applications, at data rates of 1.5 Gbit/s over 50 m. Transmission between indoor equipment and outdoor access point is possible through metal-coated insulation gla…
View article: A Physical Layer for Low Power Optical Wireless Communications
A Physical Layer for Low Power Optical Wireless Communications Open
Energy consumption is one of the critical issues in optical wireless communications transmitter design and a limiting factor to miniaturization and deployment in mobile devices. In order to reduce energy requirements, we assess a physical …
View article: Demonstration of Optical Wireless Communications Using the Pulsed Modulation PHY in IEEE 802.15.13
Demonstration of Optical Wireless Communications Using the Pulsed Modulation PHY in IEEE 802.15.13 Open
In optical wireless communications (OWC), orthogonal frequency division multiplexing has become a common choice of modulation as it is well established in both wired and radio frequency wireless applications. While it has advantages such a…
View article: LiFi Experiments in a Hospital
LiFi Experiments in a Hospital Open
We present LiFi channel measurements in a neurosurgery room of Motol University Hospital in Prague. Individual channels are combined into a virtual multiuser MIMO link. We report achievable data rates for different LiFi transmission scheme…
View article: Use of Plastic Optical Fibers for Distributed MIMO in Li-Fi Systems
Use of Plastic Optical Fibers for Distributed MIMO in Li-Fi Systems Open
Previous researches on optical wireless communication (OWC) focused mainly on increasing the data rate for mobile broadband delivery. However, for new applications such as industrial wireless, reliability and robustness against interferenc…
View article: Real-Time Optical Wireless Mobile Communication With High Physical Layer Reliability
Real-Time Optical Wireless Mobile Communication With High Physical Layer Reliability Open
As the use of optical wireless communication (OWC) in industrial production environments is gaining interest, it is necessary to consider the application's challenging requirements with respect to reliability and low latency. In this paper…
View article: Outdoor Measurements Using an Optical Wireless Link for Fixed-Access Applications
Outdoor Measurements Using an Optical Wireless Link for Fixed-Access Applications Open
In this paper, results are presented from a long-term outdoor field trial using a rate-adaptive, LED-based optical wireless link over 100 m rooftop-to-rooftop distance. The optical link is installed in parallel to a 60 GHz link, enabling a…