Till Wollenberg

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In this paper we focus on measuring channel occupancy in the 2.4 GHz ISM band in a way that transmissions from Wireless LAN stations and other spectrum users can be distinguished. Most current 802.11 hardware does not offer methods to capture channel occupancy caused by non-802.11 transmissions accurately. We therefore combine a commodity 802.11 Wireless(More)
Our work aims to improve the usability of wireless mesh networks as communication layer of smart office environments. While wireless mesh networks are well-suited for this task in general, the negative impact of interference, fading, and saturation makes the communication basically opportunistic. Our goal is to develop a system which allows a short-term(More)
The visual analysis of dynamic networks is a challenging task. In this paper, we introduce a new approach supporting the discovery of substructures sharing a similar trend over time by combining computation, visualization and interaction. With existing techniques, their discovery would be a tedious endeavor because of the number of nodes, edges as well as(More)
The 2.4 GHz frequency band is used by various devices, including WiFi, microwave ovens and Bluetooth. For WiFi devices, it is desirable to have information about occupancy of the spectrum available to select optimal channels and to predict link performance. As only few devices are capable of acquiring such information, devices may share it. However, using(More)
The basic idea presented in this paper is to use interference aware routing with predicted interference. Noise and other values are measured over a long time and within a wide area in order to find recurring patterns. Routing parameters are then adjusted according to these patterns. The objective is to improve the general network performance without(More)
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