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Presence detection is used in occupancy control to dynamically adjust energy-related appliances in smart building applications. Yet, practical applications typically suffer from high sensor unreliability. We propose a computationally efficient approach, based on Hidden Markov Models, to fuse sensor observations from multiple sensors to better estimate user state (presence/absence). Our model considers...
Stochastic analysis of wireless sensor networks becomes exceedingly hard as the number of nodes in a network grows large. In this paper we intend to address this issue by proposing a method of modeling large networks by dynamical systems rather than explicit Markov models, called Mean-Field Approximation. We verify the suitability of Mean-Field Approximation by analyzing ALOHA, by both studying a...
Visible Light Communications (VLC) have been promoted as an energy-efficient Gb/s-technology for indoor settings, since VLC can be merged with the illumination functionality. As a result, Joint Illumination and visible-light Communication (JIC) systems are perceived as a green technology and the research on VLC mainly focuses on increasing the data rates. In this paper, we demonstrate that the communication...
Lighting control applications have very strict latency and reliability requirements. Multihop wireless communication between lamps provides a low cost and flexible solution, but as networks grow large and dense, it becomes harder to satisfy these requirements. The Trickle algorithm has been proposed as a gossiping method for Wireless Sensor Networks. This work explores whether the process of generation...
This paper presents the analysis, the efficiency optimization and the design strategy of a Dickson type rectifier using 65nm CMOS technology. The rectifier is used as an on-chip wireless power receiver for wireless power transfer applications. The modeling of this rectifier takes the threshold voltage variation, bulk modulation, and the major parasitic capacitors into account. A mathematical model...
Interoperability between systems for secure delivery of content (audio and video) over the Internet or via digital television broadcasting is still hampered by the lack of interoperability among proprietary content protection systems. The OPIMA (Open Platform Initiative for Multimedia Access) specification offers a generic solution for multimedia terminals, in which the end-user's terminal is adapted...
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