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Nobby Stevens
Katholieke Universiteit Leuven
EngineeringElectronic engineeringWireless power transferTransmitterWireless
87Publications
7H-index
238Citations
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Publications 81
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#1Nobby Stevens (Katholieke Universiteit Leuven)H-Index: 7
#2Heidi Steendam (UGent: Ghent University)H-Index: 25
Abstract In this work, a set of general expressions treating both transmitter and receiver tilt in received signal strength based visible light positioning is elaborated. A meticulous approach involving Euler rotations leads to a compact expression for the modified channel gain that can be interpreted graphically. It is demonstrated that ignoring even small tilt angles can easily result in a bias of the planar positioning estimation in the order of several tens of centimeters in realistic settin...
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#1Nicolas KnuddeH-Index: 3
#2Willem RaesH-Index: 2
Last. Nobby StevensH-Index: 7
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#1Sander BastiaensH-Index: 4
#2Willem RaesH-Index: 2
Last. David PletsH-Index: 14
view all 6 authors...
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#1Robin Amsters (Katholieke Universiteit Leuven)H-Index: 1
#2Eric Demeester (Katholieke Universiteit Leuven)H-Index: 13
Last. Peter Slaets (Katholieke Universiteit Leuven)H-Index: 6
view all 4 authors...
Indoor positioning with visible light has become increasingly important in recent years. Usually, light sources are modulated at high speeds in order to wirelessly transmit data from the fixtures to a receiver. The accuracy of such systems can range from a few decimeters to a few centimeters. However, additional modulation hardware is required for every light source, thereby increasing cost and system complexity. This paper investigates the use of unmodulated light for indoor positioning. Contra...
1 CitationsSource
#1Willem Raes (Katholieke Universiteit Leuven)H-Index: 2
#2Sander Bastiaens (UGent: Ghent University)H-Index: 4
Last. Nobby Stevens (Katholieke Universiteit Leuven)H-Index: 7
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This work discusses the influence of a photodiodes effective area size on the precision of received signal strength-based visible light positioning. It analyzes how two silicon-based photodiodes with different effective area perform as a receiver under varying illumination conditions. The two main findings are that it is not particularly needed to select a photodiode with a large surface area, despite the higher received signal strength, due to a higher noise contribution. On the other hand, the...
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#1David Plets (UGent: Ghent University)H-Index: 14
#2Sander Bastiaens (UGent: Ghent University)H-Index: 4
Last. Nobby Stevens (Katholieke Universiteit Leuven)H-Index: 7
view all 5 authors...
Abstract This paper presents a simulation study of the impact of Light Emitting Diode (LED) output power uncertainty on the accuracy of Received Signal Strength (RSS)-based two-dimensional (2D) and three-dimensional (3D) Visible Light Positioning (VLP). The actual emitted power of a LED is never exactly equal to the value that is tabulated in the datasheet, with possible variations (or tolerances) up to 20%. Since RSS-based VLP builds on converting estimated channel attenuations to distances and...
6 CitationsSource
#1Nobby Stevens (Katholieke Universiteit Leuven)H-Index: 7
Visible light positioning is an emerging technology for indoor localization that has the advantage of high precision on the distance estimation. Unfortunately, there are several aspects that can introduce biased results. The research published so far on this technology considers perfect Lambertian radiation patterns. In this work, the impact of the deviation of the radiation pattern of an off-the-shelf LED compared with the Lambertian radiator on the distance estimation is investigated. This imp...
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#1Robin Amsters (Katholieke Universiteit Leuven)H-Index: 1
#2Eric Demeester (Katholieke Universiteit Leuven)H-Index: 13
Last. Nobby Stevens (Katholieke Universiteit Leuven)H-Index: 7
view all 6 authors...
Localization based on visible light is a novel technique for indoor positioning that provides a number of advantages over traditional radio frequency based approaches. An important step in the deployment of visible light positioning systems is the calibration procedure, during which environmental parameters such as the positions of light sources are determined. This work presents a proof-of-concept approach to obtain these parameters in an efficient manner by using a mobile robot. This robot bui...
1 CitationsSource
#1David Plets (UGent: Ghent University)H-Index: 14
#2Sander Bastiaens (UGent: Ghent University)H-Index: 4
Last. Wout Joseph (UGent: Ghent University)H-Index: 37
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This paper assesses the accuracy of a three-dimensional Visible Light Positioning (VLP) algorithm for two different Light Emitting Diode (LED) configurations using the same four LEDs, but mounted at different locations on the ceiling. The two configurations are both simulated and measured at 22801 test points. It is observed that a classic square LED configuration results in position ambiguities, causing errors up to several meters. Alternatively, a star-shaped LED configuration is able to uniqu...
3 CitationsSource
#1Sander Bastiaens (Katholieke Universiteit Leuven)H-Index: 4
#1Sander Bastiaens (Katholieke Universiteit Leuven)H-Index: 1
Last. David Plets (UGent: Ghent University)H-Index: 14
view all 5 authors...
Visible Light Positioning (VLP) might enable auspicious tracking systems, well-suited for low-cost and route-configurable autonomous guided vehicles. Yielding the high accuracy required, necessitates a detailed modelling of a photodiode (PD) receiver's angular characteristics. Still lacking, current RSS-based VLP systems implicitly cope by measuring and (arbitrarily) fitting the received power - distance relation. Upon PD changeover, a recalibration is needed. In this paper, it is shown that ade...
1 CitationsSource
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