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This paper presents a method for the simultaneous and precise localization of multiple coils in a shelf based on low frequency magnetic fields. The separation of the signals is achieved by modulating the coils' resonance frequencies using orthogonal codes. Accuracy measurements were conducted with a setup consisting of one exciter loop, four localization coils and eight receiver loops. Results show...
Nowadays, many applications demand precise localization information. One of those applications is wildlife monitoring, e.g. tracking of bats. Wireless sensor networks featuring field strength measurements are a promising approach to track tiny and lightweight animals. In this paper a robust grid-based filter for the localization of bats based on field strength measurements is proposed. Therefore,...
In this paper, an over-the-air test strategy for evaluating cognitive radio nodes is presented. This technique allows to emulate the activities of primary and secondary users with respect to received power spectral densities, and the spatial structures of their radio channels. This enables an experimental evaluation of cognitive devices with directional and spectral sensitivity. This type of testing...
Signal diversity is used as a common method to improve the service availability in digital satellite communication and broadcasting systems. This paper focuses on the achievable receive antenna- and time diversity gain for land mobile satellite applications in various environments. A measurement van was equipped with four antennas, mounted at the front, back, left and right side of the rooftop. A...
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