M. Baldauf

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To design an OFDM train communications system it is essential to characterize and consider the channel parameters. For a high train scenario the transmission channel is frequency selective as well as time variant. Thus, delay spread and Doppler spread are investigated as crucial parameters for the OFDM system performance. Using a ray-tracing tool realistic(More)
A mobile phone equipped with a multiple antenna system is investigated with respect to its human exposure to electromagnetic fields. The channel conditions and the demanded capacity determine the required exictation voltages, which are passed to a commercial software tool. To get rid of the influence of various antenna distances to the shaped human head a(More)
Low power ultra-wideband (UWB) technology offers new and promising possibilities for high data rate communications and high resolution sensors. The key issue for the deployment of such systems is the coexistence of UWB systems with narrowband systems located in the same frequency range. Therefore, the maximum transmit power spectral density (PSD) has to be(More)
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